19682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall/* 29682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall SDL - Simple DirectMedia Layer 39682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall Copyright (C) 1997-2012 Sam Lantinga 49682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 59682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall This library is free software; you can redistribute it and/or 69682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall modify it under the terms of the GNU Lesser General Public 79682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall License as published by the Free Software Foundation; either 89682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall version 2.1 of the License, or (at your option) any later version. 99682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 109682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall This library is distributed in the hope that it will be useful, 119682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall but WITHOUT ANY WARRANTY; without even the implied warranty of 129682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 139682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall Lesser General Public License for more details. 149682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 159682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall You should have received a copy of the GNU Lesser General Public 169682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall License along with this library; if not, write to the Free Software 179682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA 189682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 199682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall Sam Lantinga 209682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall slouken@libsdl.org 219682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall*/ 229682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall#include "SDL_config.h" 239682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 249682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall/* Functions for audio drivers to perform runtime conversion of audio format */ 259682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 269682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall#include "SDL_audio.h" 279682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 289682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 299682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall/* Effectively mix right and left channels into a single channel */ 309682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hallvoid SDLCALL SDL_ConvertMono(SDL_AudioCVT *cvt, Uint16 format) 319682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall{ 329682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall int i; 339682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall Sint32 sample; 349682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 359682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall#ifdef DEBUG_CONVERT 369682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall fprintf(stderr, "Converting to mono\n"); 379682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall#endif 389682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall switch (format&0x8018) { 399682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 409682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall case AUDIO_U8: { 419682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall Uint8 *src, *dst; 429682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 439682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall src = cvt->buf; 449682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst = cvt->buf; 459682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall for ( i=cvt->len_cvt/2; i; --i ) { 469682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall sample = src[0] + src[1]; 479682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall *dst = (Uint8)(sample / 2); 489682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall src += 2; 499682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst += 1; 509682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 519682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 529682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall break; 539682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 549682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall case AUDIO_S8: { 559682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall Sint8 *src, *dst; 569682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 579682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall src = (Sint8 *)cvt->buf; 589682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst = (Sint8 *)cvt->buf; 599682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall for ( i=cvt->len_cvt/2; i; --i ) { 609682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall sample = src[0] + src[1]; 619682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall *dst = (Sint8)(sample / 2); 629682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall src += 2; 639682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst += 1; 649682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 659682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 669682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall break; 679682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 689682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall case AUDIO_U16: { 699682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall Uint8 *src, *dst; 709682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 719682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall src = cvt->buf; 729682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst = cvt->buf; 739682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall if ( (format & 0x1000) == 0x1000 ) { 749682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall for ( i=cvt->len_cvt/4; i; --i ) { 759682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall sample = (Uint16)((src[0]<<8)|src[1])+ 769682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall (Uint16)((src[2]<<8)|src[3]); 779682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall sample /= 2; 789682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[1] = (sample&0xFF); 799682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall sample >>= 8; 809682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[0] = (sample&0xFF); 819682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall src += 4; 829682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst += 2; 839682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 849682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } else { 859682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall for ( i=cvt->len_cvt/4; i; --i ) { 869682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall sample = (Uint16)((src[1]<<8)|src[0])+ 879682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall (Uint16)((src[3]<<8)|src[2]); 889682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall sample /= 2; 899682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[0] = (sample&0xFF); 909682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall sample >>= 8; 919682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[1] = (sample&0xFF); 929682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall src += 4; 939682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst += 2; 949682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 959682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 969682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 979682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall break; 989682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 999682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall case AUDIO_S16: { 1009682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall Uint8 *src, *dst; 1019682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 1029682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall src = cvt->buf; 1039682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst = cvt->buf; 1049682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall if ( (format & 0x1000) == 0x1000 ) { 1059682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall for ( i=cvt->len_cvt/4; i; --i ) { 1069682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall sample = (Sint16)((src[0]<<8)|src[1])+ 1079682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall (Sint16)((src[2]<<8)|src[3]); 1089682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall sample /= 2; 1099682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[1] = (sample&0xFF); 1109682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall sample >>= 8; 1119682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[0] = (sample&0xFF); 1129682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall src += 4; 1139682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst += 2; 1149682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 1159682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } else { 1169682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall for ( i=cvt->len_cvt/4; i; --i ) { 1179682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall sample = (Sint16)((src[1]<<8)|src[0])+ 1189682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall (Sint16)((src[3]<<8)|src[2]); 1199682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall sample /= 2; 1209682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[0] = (sample&0xFF); 1219682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall sample >>= 8; 1229682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[1] = (sample&0xFF); 1239682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall src += 4; 1249682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst += 2; 1259682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 1269682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 1279682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 1289682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall break; 1299682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 1309682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall cvt->len_cvt /= 2; 1319682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall if ( cvt->filters[++cvt->filter_index] ) { 1329682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall cvt->filters[cvt->filter_index](cvt, format); 1339682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 1349682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall} 1359682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 1369682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall/* Discard top 4 channels */ 1379682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hallvoid SDLCALL SDL_ConvertStrip(SDL_AudioCVT *cvt, Uint16 format) 1389682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall{ 1399682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall int i; 1409682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall Sint32 lsample, rsample; 1419682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 1429682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall#ifdef DEBUG_CONVERT 1439682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall fprintf(stderr, "Converting down to stereo\n"); 1449682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall#endif 1459682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall switch (format&0x8018) { 1469682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 1479682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall case AUDIO_U8: { 1489682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall Uint8 *src, *dst; 1499682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 1509682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall src = cvt->buf; 1519682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst = cvt->buf; 1529682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall for ( i=cvt->len_cvt/6; i; --i ) { 1539682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[0] = src[0]; 1549682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[1] = src[1]; 1559682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall src += 6; 1569682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst += 2; 1579682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 1589682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 1599682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall break; 1609682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 1619682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall case AUDIO_S8: { 1629682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall Sint8 *src, *dst; 1639682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 1649682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall src = (Sint8 *)cvt->buf; 1659682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst = (Sint8 *)cvt->buf; 1669682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall for ( i=cvt->len_cvt/6; i; --i ) { 1679682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[0] = src[0]; 1689682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[1] = src[1]; 1699682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall src += 6; 1709682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst += 2; 1719682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 1729682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 1739682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall break; 1749682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 1759682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall case AUDIO_U16: { 1769682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall Uint8 *src, *dst; 1779682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 1789682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall src = cvt->buf; 1799682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst = cvt->buf; 1809682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall if ( (format & 0x1000) == 0x1000 ) { 1819682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall for ( i=cvt->len_cvt/12; i; --i ) { 1829682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall lsample = (Uint16)((src[0]<<8)|src[1]); 1839682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall rsample = (Uint16)((src[2]<<8)|src[3]); 1849682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[1] = (lsample&0xFF); 1859682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall lsample >>= 8; 1869682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[0] = (lsample&0xFF); 1879682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[3] = (rsample&0xFF); 1889682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall rsample >>= 8; 1899682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[2] = (rsample&0xFF); 1909682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall src += 12; 1919682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst += 4; 1929682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 1939682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } else { 1949682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall for ( i=cvt->len_cvt/12; i; --i ) { 1959682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall lsample = (Uint16)((src[1]<<8)|src[0]); 1969682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall rsample = (Uint16)((src[3]<<8)|src[2]); 1979682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[0] = (lsample&0xFF); 1989682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall lsample >>= 8; 1999682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[1] = (lsample&0xFF); 2009682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[2] = (rsample&0xFF); 2019682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall rsample >>= 8; 2029682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[3] = (rsample&0xFF); 2039682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall src += 12; 2049682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst += 4; 2059682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 2069682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 2079682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 2089682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall break; 2099682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 2109682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall case AUDIO_S16: { 2119682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall Uint8 *src, *dst; 2129682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 2139682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall src = cvt->buf; 2149682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst = cvt->buf; 2159682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall if ( (format & 0x1000) == 0x1000 ) { 2169682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall for ( i=cvt->len_cvt/12; i; --i ) { 2179682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall lsample = (Sint16)((src[0]<<8)|src[1]); 2189682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall rsample = (Sint16)((src[2]<<8)|src[3]); 2199682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[1] = (lsample&0xFF); 2209682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall lsample >>= 8; 2219682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[0] = (lsample&0xFF); 2229682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[3] = (rsample&0xFF); 2239682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall rsample >>= 8; 2249682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[2] = (rsample&0xFF); 2259682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall src += 12; 2269682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst += 4; 2279682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 2289682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } else { 2299682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall for ( i=cvt->len_cvt/12; i; --i ) { 2309682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall lsample = (Sint16)((src[1]<<8)|src[0]); 2319682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall rsample = (Sint16)((src[3]<<8)|src[2]); 2329682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[0] = (lsample&0xFF); 2339682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall lsample >>= 8; 2349682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[1] = (lsample&0xFF); 2359682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[2] = (rsample&0xFF); 2369682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall rsample >>= 8; 2379682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[3] = (rsample&0xFF); 2389682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall src += 12; 2399682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst += 4; 2409682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 2419682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 2429682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 2439682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall break; 2449682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 2459682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall cvt->len_cvt /= 3; 2469682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall if ( cvt->filters[++cvt->filter_index] ) { 2479682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall cvt->filters[cvt->filter_index](cvt, format); 2489682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 2499682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall} 2509682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 2519682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 2529682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall/* Discard top 2 channels of 6 */ 2539682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hallvoid SDLCALL SDL_ConvertStrip_2(SDL_AudioCVT *cvt, Uint16 format) 2549682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall{ 2559682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall int i; 2569682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall Sint32 lsample, rsample; 2579682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 2589682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall#ifdef DEBUG_CONVERT 2599682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall fprintf(stderr, "Converting 6 down to quad\n"); 2609682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall#endif 2619682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall switch (format&0x8018) { 2629682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 2639682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall case AUDIO_U8: { 2649682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall Uint8 *src, *dst; 2659682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 2669682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall src = cvt->buf; 2679682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst = cvt->buf; 2689682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall for ( i=cvt->len_cvt/4; i; --i ) { 2699682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[0] = src[0]; 2709682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[1] = src[1]; 2719682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall src += 4; 2729682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst += 2; 2739682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 2749682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 2759682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall break; 2769682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 2779682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall case AUDIO_S8: { 2789682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall Sint8 *src, *dst; 2799682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 2809682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall src = (Sint8 *)cvt->buf; 2819682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst = (Sint8 *)cvt->buf; 2829682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall for ( i=cvt->len_cvt/4; i; --i ) { 2839682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[0] = src[0]; 2849682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[1] = src[1]; 2859682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall src += 4; 2869682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst += 2; 2879682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 2889682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 2899682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall break; 2909682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 2919682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall case AUDIO_U16: { 2929682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall Uint8 *src, *dst; 2939682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 2949682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall src = cvt->buf; 2959682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst = cvt->buf; 2969682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall if ( (format & 0x1000) == 0x1000 ) { 2979682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall for ( i=cvt->len_cvt/8; i; --i ) { 2989682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall lsample = (Uint16)((src[0]<<8)|src[1]); 2999682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall rsample = (Uint16)((src[2]<<8)|src[3]); 3009682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[1] = (lsample&0xFF); 3019682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall lsample >>= 8; 3029682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[0] = (lsample&0xFF); 3039682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[3] = (rsample&0xFF); 3049682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall rsample >>= 8; 3059682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[2] = (rsample&0xFF); 3069682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall src += 8; 3079682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst += 4; 3089682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 3099682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } else { 3109682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall for ( i=cvt->len_cvt/8; i; --i ) { 3119682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall lsample = (Uint16)((src[1]<<8)|src[0]); 3129682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall rsample = (Uint16)((src[3]<<8)|src[2]); 3139682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[0] = (lsample&0xFF); 3149682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall lsample >>= 8; 3159682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[1] = (lsample&0xFF); 3169682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[2] = (rsample&0xFF); 3179682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall rsample >>= 8; 3189682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[3] = (rsample&0xFF); 3199682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall src += 8; 3209682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst += 4; 3219682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 3229682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 3239682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 3249682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall break; 3259682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 3269682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall case AUDIO_S16: { 3279682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall Uint8 *src, *dst; 3289682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 3299682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall src = cvt->buf; 3309682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst = cvt->buf; 3319682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall if ( (format & 0x1000) == 0x1000 ) { 3329682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall for ( i=cvt->len_cvt/8; i; --i ) { 3339682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall lsample = (Sint16)((src[0]<<8)|src[1]); 3349682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall rsample = (Sint16)((src[2]<<8)|src[3]); 3359682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[1] = (lsample&0xFF); 3369682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall lsample >>= 8; 3379682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[0] = (lsample&0xFF); 3389682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[3] = (rsample&0xFF); 3399682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall rsample >>= 8; 3409682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[2] = (rsample&0xFF); 3419682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall src += 8; 3429682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst += 4; 3439682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 3449682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } else { 3459682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall for ( i=cvt->len_cvt/8; i; --i ) { 3469682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall lsample = (Sint16)((src[1]<<8)|src[0]); 3479682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall rsample = (Sint16)((src[3]<<8)|src[2]); 3489682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[0] = (lsample&0xFF); 3499682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall lsample >>= 8; 3509682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[1] = (lsample&0xFF); 3519682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[2] = (rsample&0xFF); 3529682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall rsample >>= 8; 3539682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[3] = (rsample&0xFF); 3549682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall src += 8; 3559682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst += 4; 3569682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 3579682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 3589682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 3599682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall break; 3609682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 3619682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall cvt->len_cvt /= 2; 3629682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall if ( cvt->filters[++cvt->filter_index] ) { 3639682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall cvt->filters[cvt->filter_index](cvt, format); 3649682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 3659682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall} 3669682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 3679682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall/* Duplicate a mono channel to both stereo channels */ 3689682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hallvoid SDLCALL SDL_ConvertStereo(SDL_AudioCVT *cvt, Uint16 format) 3699682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall{ 3709682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall int i; 3719682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 3729682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall#ifdef DEBUG_CONVERT 3739682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall fprintf(stderr, "Converting to stereo\n"); 3749682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall#endif 3759682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall if ( (format & 0xFF) == 16 ) { 3769682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall Uint16 *src, *dst; 3779682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 3789682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall src = (Uint16 *)(cvt->buf+cvt->len_cvt); 3799682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst = (Uint16 *)(cvt->buf+cvt->len_cvt*2); 3809682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall for ( i=cvt->len_cvt/2; i; --i ) { 3819682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst -= 2; 3829682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall src -= 1; 3839682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[0] = src[0]; 3849682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[1] = src[0]; 3859682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 3869682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } else { 3879682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall Uint8 *src, *dst; 3889682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 3899682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall src = cvt->buf+cvt->len_cvt; 3909682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst = cvt->buf+cvt->len_cvt*2; 3919682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall for ( i=cvt->len_cvt; i; --i ) { 3929682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst -= 2; 3939682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall src -= 1; 3949682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[0] = src[0]; 3959682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[1] = src[0]; 3969682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 3979682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 3989682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall cvt->len_cvt *= 2; 3999682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall if ( cvt->filters[++cvt->filter_index] ) { 4009682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall cvt->filters[cvt->filter_index](cvt, format); 4019682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 4029682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall} 4039682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 4049682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 4059682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall/* Duplicate a stereo channel to a pseudo-5.1 stream */ 4069682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hallvoid SDLCALL SDL_ConvertSurround(SDL_AudioCVT *cvt, Uint16 format) 4079682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall{ 4089682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall int i; 4099682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 4109682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall#ifdef DEBUG_CONVERT 4119682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall fprintf(stderr, "Converting stereo to surround\n"); 4129682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall#endif 4139682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall switch (format&0x8018) { 4149682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 4159682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall case AUDIO_U8: { 4169682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall Uint8 *src, *dst, lf, rf, ce; 4179682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 4189682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall src = (Uint8 *)(cvt->buf+cvt->len_cvt); 4199682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst = (Uint8 *)(cvt->buf+cvt->len_cvt*3); 4209682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall for ( i=cvt->len_cvt; i; --i ) { 4219682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst -= 6; 4229682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall src -= 2; 4239682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall lf = src[0]; 4249682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall rf = src[1]; 4259682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall ce = (lf/2) + (rf/2); 4269682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[0] = lf; 4279682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[1] = rf; 4289682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[2] = lf - ce; 4299682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[3] = rf - ce; 4309682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[4] = ce; 4319682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[5] = ce; 4329682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 4339682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 4349682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall break; 4359682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 4369682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall case AUDIO_S8: { 4379682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall Sint8 *src, *dst, lf, rf, ce; 4389682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 4399682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall src = (Sint8 *)cvt->buf+cvt->len_cvt; 4409682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst = (Sint8 *)cvt->buf+cvt->len_cvt*3; 4419682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall for ( i=cvt->len_cvt; i; --i ) { 4429682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst -= 6; 4439682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall src -= 2; 4449682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall lf = src[0]; 4459682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall rf = src[1]; 4469682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall ce = (lf/2) + (rf/2); 4479682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[0] = lf; 4489682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[1] = rf; 4499682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[2] = lf - ce; 4509682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[3] = rf - ce; 4519682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[4] = ce; 4529682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[5] = ce; 4539682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 4549682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 4559682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall break; 4569682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 4579682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall case AUDIO_U16: { 4589682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall Uint8 *src, *dst; 4599682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall Uint16 lf, rf, ce, lr, rr; 4609682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 4619682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall src = cvt->buf+cvt->len_cvt; 4629682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst = cvt->buf+cvt->len_cvt*3; 4639682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 4649682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall if ( (format & 0x1000) == 0x1000 ) { 4659682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall for ( i=cvt->len_cvt/4; i; --i ) { 4669682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst -= 12; 4679682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall src -= 4; 4689682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall lf = (Uint16)((src[0]<<8)|src[1]); 4699682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall rf = (Uint16)((src[2]<<8)|src[3]); 4709682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall ce = (lf/2) + (rf/2); 4719682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall rr = lf - ce; 4729682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall lr = rf - ce; 4739682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[1] = (lf&0xFF); 4749682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[0] = ((lf>>8)&0xFF); 4759682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[3] = (rf&0xFF); 4769682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[2] = ((rf>>8)&0xFF); 4779682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 4789682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[1+4] = (lr&0xFF); 4799682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[0+4] = ((lr>>8)&0xFF); 4809682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[3+4] = (rr&0xFF); 4819682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[2+4] = ((rr>>8)&0xFF); 4829682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 4839682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[1+8] = (ce&0xFF); 4849682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[0+8] = ((ce>>8)&0xFF); 4859682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[3+8] = (ce&0xFF); 4869682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[2+8] = ((ce>>8)&0xFF); 4879682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 4889682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } else { 4899682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall for ( i=cvt->len_cvt/4; i; --i ) { 4909682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst -= 12; 4919682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall src -= 4; 4929682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall lf = (Uint16)((src[1]<<8)|src[0]); 4939682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall rf = (Uint16)((src[3]<<8)|src[2]); 4949682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall ce = (lf/2) + (rf/2); 4959682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall rr = lf - ce; 4969682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall lr = rf - ce; 4979682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[0] = (lf&0xFF); 4989682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[1] = ((lf>>8)&0xFF); 4999682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[2] = (rf&0xFF); 5009682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[3] = ((rf>>8)&0xFF); 5019682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 5029682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[0+4] = (lr&0xFF); 5039682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[1+4] = ((lr>>8)&0xFF); 5049682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[2+4] = (rr&0xFF); 5059682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[3+4] = ((rr>>8)&0xFF); 5069682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 5079682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[0+8] = (ce&0xFF); 5089682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[1+8] = ((ce>>8)&0xFF); 5099682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[2+8] = (ce&0xFF); 5109682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[3+8] = ((ce>>8)&0xFF); 5119682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 5129682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 5139682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 5149682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall break; 5159682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 5169682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall case AUDIO_S16: { 5179682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall Uint8 *src, *dst; 5189682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall Sint16 lf, rf, ce, lr, rr; 5199682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 5209682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall src = cvt->buf+cvt->len_cvt; 5219682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst = cvt->buf+cvt->len_cvt*3; 5229682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 5239682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall if ( (format & 0x1000) == 0x1000 ) { 5249682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall for ( i=cvt->len_cvt/4; i; --i ) { 5259682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst -= 12; 5269682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall src -= 4; 5279682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall lf = (Sint16)((src[0]<<8)|src[1]); 5289682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall rf = (Sint16)((src[2]<<8)|src[3]); 5299682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall ce = (lf/2) + (rf/2); 5309682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall rr = lf - ce; 5319682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall lr = rf - ce; 5329682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[1] = (lf&0xFF); 5339682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[0] = ((lf>>8)&0xFF); 5349682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[3] = (rf&0xFF); 5359682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[2] = ((rf>>8)&0xFF); 5369682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 5379682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[1+4] = (lr&0xFF); 5389682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[0+4] = ((lr>>8)&0xFF); 5399682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[3+4] = (rr&0xFF); 5409682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[2+4] = ((rr>>8)&0xFF); 5419682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 5429682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[1+8] = (ce&0xFF); 5439682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[0+8] = ((ce>>8)&0xFF); 5449682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[3+8] = (ce&0xFF); 5459682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[2+8] = ((ce>>8)&0xFF); 5469682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 5479682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } else { 5489682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall for ( i=cvt->len_cvt/4; i; --i ) { 5499682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst -= 12; 5509682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall src -= 4; 5519682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall lf = (Sint16)((src[1]<<8)|src[0]); 5529682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall rf = (Sint16)((src[3]<<8)|src[2]); 5539682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall ce = (lf/2) + (rf/2); 5549682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall rr = lf - ce; 5559682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall lr = rf - ce; 5569682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[0] = (lf&0xFF); 5579682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[1] = ((lf>>8)&0xFF); 5589682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[2] = (rf&0xFF); 5599682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[3] = ((rf>>8)&0xFF); 5609682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 5619682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[0+4] = (lr&0xFF); 5629682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[1+4] = ((lr>>8)&0xFF); 5639682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[2+4] = (rr&0xFF); 5649682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[3+4] = ((rr>>8)&0xFF); 5659682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 5669682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[0+8] = (ce&0xFF); 5679682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[1+8] = ((ce>>8)&0xFF); 5689682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[2+8] = (ce&0xFF); 5699682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[3+8] = ((ce>>8)&0xFF); 5709682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 5719682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 5729682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 5739682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall break; 5749682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 5759682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall cvt->len_cvt *= 3; 5769682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall if ( cvt->filters[++cvt->filter_index] ) { 5779682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall cvt->filters[cvt->filter_index](cvt, format); 5789682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 5799682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall} 5809682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 5819682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 5829682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall/* Duplicate a stereo channel to a pseudo-4.0 stream */ 5839682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hallvoid SDLCALL SDL_ConvertSurround_4(SDL_AudioCVT *cvt, Uint16 format) 5849682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall{ 5859682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall int i; 5869682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 5879682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall#ifdef DEBUG_CONVERT 5889682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall fprintf(stderr, "Converting stereo to quad\n"); 5899682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall#endif 5909682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall switch (format&0x8018) { 5919682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 5929682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall case AUDIO_U8: { 5939682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall Uint8 *src, *dst, lf, rf, ce; 5949682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 5959682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall src = (Uint8 *)(cvt->buf+cvt->len_cvt); 5969682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst = (Uint8 *)(cvt->buf+cvt->len_cvt*2); 5979682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall for ( i=cvt->len_cvt; i; --i ) { 5989682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst -= 4; 5999682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall src -= 2; 6009682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall lf = src[0]; 6019682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall rf = src[1]; 6029682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall ce = (lf/2) + (rf/2); 6039682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[0] = lf; 6049682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[1] = rf; 6059682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[2] = lf - ce; 6069682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[3] = rf - ce; 6079682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 6089682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 6099682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall break; 6109682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 6119682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall case AUDIO_S8: { 6129682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall Sint8 *src, *dst, lf, rf, ce; 6139682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 6149682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall src = (Sint8 *)cvt->buf+cvt->len_cvt; 6159682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst = (Sint8 *)cvt->buf+cvt->len_cvt*2; 6169682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall for ( i=cvt->len_cvt; i; --i ) { 6179682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst -= 4; 6189682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall src -= 2; 6199682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall lf = src[0]; 6209682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall rf = src[1]; 6219682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall ce = (lf/2) + (rf/2); 6229682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[0] = lf; 6239682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[1] = rf; 6249682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[2] = lf - ce; 6259682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[3] = rf - ce; 6269682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 6279682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 6289682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall break; 6299682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 6309682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall case AUDIO_U16: { 6319682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall Uint8 *src, *dst; 6329682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall Uint16 lf, rf, ce, lr, rr; 6339682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 6349682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall src = cvt->buf+cvt->len_cvt; 6359682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst = cvt->buf+cvt->len_cvt*2; 6369682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 6379682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall if ( (format & 0x1000) == 0x1000 ) { 6389682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall for ( i=cvt->len_cvt/4; i; --i ) { 6399682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst -= 8; 6409682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall src -= 4; 6419682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall lf = (Uint16)((src[0]<<8)|src[1]); 6429682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall rf = (Uint16)((src[2]<<8)|src[3]); 6439682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall ce = (lf/2) + (rf/2); 6449682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall rr = lf - ce; 6459682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall lr = rf - ce; 6469682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[1] = (lf&0xFF); 6479682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[0] = ((lf>>8)&0xFF); 6489682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[3] = (rf&0xFF); 6499682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[2] = ((rf>>8)&0xFF); 6509682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 6519682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[1+4] = (lr&0xFF); 6529682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[0+4] = ((lr>>8)&0xFF); 6539682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[3+4] = (rr&0xFF); 6549682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[2+4] = ((rr>>8)&0xFF); 6559682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 6569682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } else { 6579682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall for ( i=cvt->len_cvt/4; i; --i ) { 6589682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst -= 8; 6599682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall src -= 4; 6609682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall lf = (Uint16)((src[1]<<8)|src[0]); 6619682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall rf = (Uint16)((src[3]<<8)|src[2]); 6629682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall ce = (lf/2) + (rf/2); 6639682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall rr = lf - ce; 6649682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall lr = rf - ce; 6659682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[0] = (lf&0xFF); 6669682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[1] = ((lf>>8)&0xFF); 6679682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[2] = (rf&0xFF); 6689682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[3] = ((rf>>8)&0xFF); 6699682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 6709682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[0+4] = (lr&0xFF); 6719682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[1+4] = ((lr>>8)&0xFF); 6729682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[2+4] = (rr&0xFF); 6739682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[3+4] = ((rr>>8)&0xFF); 6749682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 6759682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 6769682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 6779682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall break; 6789682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 6799682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall case AUDIO_S16: { 6809682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall Uint8 *src, *dst; 6819682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall Sint16 lf, rf, ce, lr, rr; 6829682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 6839682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall src = cvt->buf+cvt->len_cvt; 6849682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst = cvt->buf+cvt->len_cvt*2; 6859682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 6869682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall if ( (format & 0x1000) == 0x1000 ) { 6879682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall for ( i=cvt->len_cvt/4; i; --i ) { 6889682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst -= 8; 6899682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall src -= 4; 6909682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall lf = (Sint16)((src[0]<<8)|src[1]); 6919682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall rf = (Sint16)((src[2]<<8)|src[3]); 6929682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall ce = (lf/2) + (rf/2); 6939682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall rr = lf - ce; 6949682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall lr = rf - ce; 6959682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[1] = (lf&0xFF); 6969682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[0] = ((lf>>8)&0xFF); 6979682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[3] = (rf&0xFF); 6989682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[2] = ((rf>>8)&0xFF); 6999682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 7009682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[1+4] = (lr&0xFF); 7019682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[0+4] = ((lr>>8)&0xFF); 7029682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[3+4] = (rr&0xFF); 7039682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[2+4] = ((rr>>8)&0xFF); 7049682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 7059682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } else { 7069682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall for ( i=cvt->len_cvt/4; i; --i ) { 7079682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst -= 8; 7089682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall src -= 4; 7099682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall lf = (Sint16)((src[1]<<8)|src[0]); 7109682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall rf = (Sint16)((src[3]<<8)|src[2]); 7119682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall ce = (lf/2) + (rf/2); 7129682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall rr = lf - ce; 7139682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall lr = rf - ce; 7149682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[0] = (lf&0xFF); 7159682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[1] = ((lf>>8)&0xFF); 7169682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[2] = (rf&0xFF); 7179682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[3] = ((rf>>8)&0xFF); 7189682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 7199682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[0+4] = (lr&0xFF); 7209682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[1+4] = ((lr>>8)&0xFF); 7219682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[2+4] = (rr&0xFF); 7229682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[3+4] = ((rr>>8)&0xFF); 7239682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 7249682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 7259682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 7269682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall break; 7279682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 7289682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall cvt->len_cvt *= 2; 7299682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall if ( cvt->filters[++cvt->filter_index] ) { 7309682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall cvt->filters[cvt->filter_index](cvt, format); 7319682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 7329682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall} 7339682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 7349682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 7359682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall/* Convert 8-bit to 16-bit - LSB */ 7369682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hallvoid SDLCALL SDL_Convert16LSB(SDL_AudioCVT *cvt, Uint16 format) 7379682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall{ 7389682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall int i; 7399682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall Uint8 *src, *dst; 7409682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 7419682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall#ifdef DEBUG_CONVERT 7429682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall fprintf(stderr, "Converting to 16-bit LSB\n"); 7439682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall#endif 7449682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall src = cvt->buf+cvt->len_cvt; 7459682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst = cvt->buf+cvt->len_cvt*2; 7469682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall for ( i=cvt->len_cvt; i; --i ) { 7479682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall src -= 1; 7489682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst -= 2; 7499682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[1] = *src; 7509682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[0] = 0; 7519682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 7529682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall format = ((format & ~0x0008) | AUDIO_U16LSB); 7539682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall cvt->len_cvt *= 2; 7549682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall if ( cvt->filters[++cvt->filter_index] ) { 7559682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall cvt->filters[cvt->filter_index](cvt, format); 7569682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 7579682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall} 7589682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall/* Convert 8-bit to 16-bit - MSB */ 7599682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hallvoid SDLCALL SDL_Convert16MSB(SDL_AudioCVT *cvt, Uint16 format) 7609682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall{ 7619682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall int i; 7629682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall Uint8 *src, *dst; 7639682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 7649682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall#ifdef DEBUG_CONVERT 7659682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall fprintf(stderr, "Converting to 16-bit MSB\n"); 7669682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall#endif 7679682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall src = cvt->buf+cvt->len_cvt; 7689682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst = cvt->buf+cvt->len_cvt*2; 7699682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall for ( i=cvt->len_cvt; i; --i ) { 7709682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall src -= 1; 7719682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst -= 2; 7729682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[0] = *src; 7739682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[1] = 0; 7749682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 7759682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall format = ((format & ~0x0008) | AUDIO_U16MSB); 7769682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall cvt->len_cvt *= 2; 7779682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall if ( cvt->filters[++cvt->filter_index] ) { 7789682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall cvt->filters[cvt->filter_index](cvt, format); 7799682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 7809682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall} 7819682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 7829682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall/* Convert 16-bit to 8-bit */ 7839682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hallvoid SDLCALL SDL_Convert8(SDL_AudioCVT *cvt, Uint16 format) 7849682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall{ 7859682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall int i; 7869682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall Uint8 *src, *dst; 7879682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 7889682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall#ifdef DEBUG_CONVERT 7899682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall fprintf(stderr, "Converting to 8-bit\n"); 7909682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall#endif 7919682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall src = cvt->buf; 7929682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst = cvt->buf; 7939682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall if ( (format & 0x1000) != 0x1000 ) { /* Little endian */ 7949682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall ++src; 7959682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 7969682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall for ( i=cvt->len_cvt/2; i; --i ) { 7979682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall *dst = *src; 7989682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall src += 2; 7999682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst += 1; 8009682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 8019682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall format = ((format & ~0x9010) | AUDIO_U8); 8029682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall cvt->len_cvt /= 2; 8039682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall if ( cvt->filters[++cvt->filter_index] ) { 8049682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall cvt->filters[cvt->filter_index](cvt, format); 8059682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 8069682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall} 8079682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 8089682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall/* Toggle signed/unsigned */ 8099682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hallvoid SDLCALL SDL_ConvertSign(SDL_AudioCVT *cvt, Uint16 format) 8109682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall{ 8119682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall int i; 8129682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall Uint8 *data; 8139682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 8149682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall#ifdef DEBUG_CONVERT 8159682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall fprintf(stderr, "Converting audio signedness\n"); 8169682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall#endif 8179682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall data = cvt->buf; 8189682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall if ( (format & 0xFF) == 16 ) { 8199682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall if ( (format & 0x1000) != 0x1000 ) { /* Little endian */ 8209682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall ++data; 8219682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 8229682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall for ( i=cvt->len_cvt/2; i; --i ) { 8239682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall *data ^= 0x80; 8249682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall data += 2; 8259682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 8269682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } else { 8279682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall for ( i=cvt->len_cvt; i; --i ) { 8289682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall *data++ ^= 0x80; 8299682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 8309682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 8319682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall format = (format ^ 0x8000); 8329682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall if ( cvt->filters[++cvt->filter_index] ) { 8339682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall cvt->filters[cvt->filter_index](cvt, format); 8349682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 8359682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall} 8369682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 8379682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall/* Toggle endianness */ 8389682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hallvoid SDLCALL SDL_ConvertEndian(SDL_AudioCVT *cvt, Uint16 format) 8399682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall{ 8409682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall int i; 8419682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall Uint8 *data, tmp; 8429682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 8439682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall#ifdef DEBUG_CONVERT 8449682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall fprintf(stderr, "Converting audio endianness\n"); 8459682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall#endif 8469682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall data = cvt->buf; 8479682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall for ( i=cvt->len_cvt/2; i; --i ) { 8489682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall tmp = data[0]; 8499682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall data[0] = data[1]; 8509682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall data[1] = tmp; 8519682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall data += 2; 8529682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 8539682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall format = (format ^ 0x1000); 8549682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall if ( cvt->filters[++cvt->filter_index] ) { 8559682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall cvt->filters[cvt->filter_index](cvt, format); 8569682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 8579682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall} 8589682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 8599682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall/* Convert rate up by multiple of 2 */ 8609682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hallvoid SDLCALL SDL_RateMUL2(SDL_AudioCVT *cvt, Uint16 format) 8619682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall{ 8629682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall int i; 8639682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall Uint8 *src, *dst; 8649682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 8659682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall#ifdef DEBUG_CONVERT 8669682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall fprintf(stderr, "Converting audio rate * 2\n"); 8679682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall#endif 8689682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall src = cvt->buf+cvt->len_cvt; 8699682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst = cvt->buf+cvt->len_cvt*2; 8709682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall switch (format & 0xFF) { 8719682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall case 8: 8729682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall for ( i=cvt->len_cvt; i; --i ) { 8739682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall src -= 1; 8749682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst -= 2; 8759682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[0] = src[0]; 8769682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[1] = src[0]; 8779682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 8789682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall break; 8799682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall case 16: 8809682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall for ( i=cvt->len_cvt/2; i; --i ) { 8819682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall src -= 2; 8829682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst -= 4; 8839682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[0] = src[0]; 8849682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[1] = src[1]; 8859682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[2] = src[0]; 8869682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[3] = src[1]; 8879682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 8889682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall break; 8899682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 8909682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall cvt->len_cvt *= 2; 8919682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall if ( cvt->filters[++cvt->filter_index] ) { 8929682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall cvt->filters[cvt->filter_index](cvt, format); 8939682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 8949682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall} 8959682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 8969682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 8979682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall/* Convert rate up by multiple of 2, for stereo */ 8989682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hallvoid SDLCALL SDL_RateMUL2_c2(SDL_AudioCVT *cvt, Uint16 format) 8999682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall{ 9009682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall int i; 9019682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall Uint8 *src, *dst; 9029682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 9039682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall#ifdef DEBUG_CONVERT 9049682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall fprintf(stderr, "Converting audio rate * 2\n"); 9059682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall#endif 9069682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall src = cvt->buf+cvt->len_cvt; 9079682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst = cvt->buf+cvt->len_cvt*2; 9089682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall switch (format & 0xFF) { 9099682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall case 8: 9109682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall for ( i=cvt->len_cvt/2; i; --i ) { 9119682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall src -= 2; 9129682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst -= 4; 9139682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[0] = src[0]; 9149682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[1] = src[1]; 9159682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[2] = src[0]; 9169682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[3] = src[1]; 9179682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 9189682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall break; 9199682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall case 16: 9209682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall for ( i=cvt->len_cvt/4; i; --i ) { 9219682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall src -= 4; 9229682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst -= 8; 9239682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[0] = src[0]; 9249682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[1] = src[1]; 9259682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[2] = src[2]; 9269682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[3] = src[3]; 9279682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[4] = src[0]; 9289682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[5] = src[1]; 9299682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[6] = src[2]; 9309682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[7] = src[3]; 9319682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 9329682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall break; 9339682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 9349682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall cvt->len_cvt *= 2; 9359682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall if ( cvt->filters[++cvt->filter_index] ) { 9369682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall cvt->filters[cvt->filter_index](cvt, format); 9379682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 9389682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall} 9399682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 9409682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall/* Convert rate up by multiple of 2, for quad */ 9419682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hallvoid SDLCALL SDL_RateMUL2_c4(SDL_AudioCVT *cvt, Uint16 format) 9429682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall{ 9439682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall int i; 9449682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall Uint8 *src, *dst; 9459682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 9469682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall#ifdef DEBUG_CONVERT 9479682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall fprintf(stderr, "Converting audio rate * 2\n"); 9489682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall#endif 9499682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall src = cvt->buf+cvt->len_cvt; 9509682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst = cvt->buf+cvt->len_cvt*2; 9519682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall switch (format & 0xFF) { 9529682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall case 8: 9539682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall for ( i=cvt->len_cvt/4; i; --i ) { 9549682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall src -= 4; 9559682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst -= 8; 9569682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[0] = src[0]; 9579682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[1] = src[1]; 9589682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[2] = src[2]; 9599682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[3] = src[3]; 9609682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[4] = src[0]; 9619682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[5] = src[1]; 9629682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[6] = src[2]; 9639682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[7] = src[3]; 9649682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 9659682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall break; 9669682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall case 16: 9679682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall for ( i=cvt->len_cvt/8; i; --i ) { 9689682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall src -= 8; 9699682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst -= 16; 9709682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[0] = src[0]; 9719682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[1] = src[1]; 9729682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[2] = src[2]; 9739682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[3] = src[3]; 9749682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[4] = src[4]; 9759682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[5] = src[5]; 9769682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[6] = src[6]; 9779682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[7] = src[7]; 9789682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[8] = src[0]; 9799682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[9] = src[1]; 9809682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[10] = src[2]; 9819682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[11] = src[3]; 9829682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[12] = src[4]; 9839682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[13] = src[5]; 9849682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[14] = src[6]; 9859682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[15] = src[7]; 9869682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 9879682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall break; 9889682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 9899682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall cvt->len_cvt *= 2; 9909682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall if ( cvt->filters[++cvt->filter_index] ) { 9919682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall cvt->filters[cvt->filter_index](cvt, format); 9929682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 9939682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall} 9949682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 9959682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 9969682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall/* Convert rate up by multiple of 2, for 5.1 */ 9979682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hallvoid SDLCALL SDL_RateMUL2_c6(SDL_AudioCVT *cvt, Uint16 format) 9989682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall{ 9999682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall int i; 10009682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall Uint8 *src, *dst; 10019682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 10029682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall#ifdef DEBUG_CONVERT 10039682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall fprintf(stderr, "Converting audio rate * 2\n"); 10049682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall#endif 10059682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall src = cvt->buf+cvt->len_cvt; 10069682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst = cvt->buf+cvt->len_cvt*2; 10079682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall switch (format & 0xFF) { 10089682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall case 8: 10099682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall for ( i=cvt->len_cvt/6; i; --i ) { 10109682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall src -= 6; 10119682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst -= 12; 10129682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[0] = src[0]; 10139682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[1] = src[1]; 10149682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[2] = src[2]; 10159682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[3] = src[3]; 10169682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[4] = src[4]; 10179682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[5] = src[5]; 10189682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[6] = src[0]; 10199682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[7] = src[1]; 10209682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[8] = src[2]; 10219682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[9] = src[3]; 10229682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[10] = src[4]; 10239682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[11] = src[5]; 10249682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 10259682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall break; 10269682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall case 16: 10279682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall for ( i=cvt->len_cvt/12; i; --i ) { 10289682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall src -= 12; 10299682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst -= 24; 10309682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[0] = src[0]; 10319682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[1] = src[1]; 10329682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[2] = src[2]; 10339682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[3] = src[3]; 10349682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[4] = src[4]; 10359682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[5] = src[5]; 10369682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[6] = src[6]; 10379682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[7] = src[7]; 10389682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[8] = src[8]; 10399682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[9] = src[9]; 10409682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[10] = src[10]; 10419682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[11] = src[11]; 10429682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[12] = src[0]; 10439682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[13] = src[1]; 10449682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[14] = src[2]; 10459682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[15] = src[3]; 10469682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[16] = src[4]; 10479682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[17] = src[5]; 10489682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[18] = src[6]; 10499682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[19] = src[7]; 10509682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[20] = src[8]; 10519682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[21] = src[9]; 10529682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[22] = src[10]; 10539682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[23] = src[11]; 10549682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 10559682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall break; 10569682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 10579682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall cvt->len_cvt *= 2; 10589682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall if ( cvt->filters[++cvt->filter_index] ) { 10599682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall cvt->filters[cvt->filter_index](cvt, format); 10609682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 10619682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall} 10629682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 10639682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall/* Convert rate down by multiple of 2 */ 10649682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hallvoid SDLCALL SDL_RateDIV2(SDL_AudioCVT *cvt, Uint16 format) 10659682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall{ 10669682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall int i; 10679682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall Uint8 *src, *dst; 10689682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 10699682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall#ifdef DEBUG_CONVERT 10709682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall fprintf(stderr, "Converting audio rate / 2\n"); 10719682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall#endif 10729682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall src = cvt->buf; 10739682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst = cvt->buf; 10749682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall switch (format & 0xFF) { 10759682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall case 8: 10769682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall for ( i=cvt->len_cvt/2; i; --i ) { 10779682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[0] = src[0]; 10789682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall src += 2; 10799682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst += 1; 10809682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 10819682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall break; 10829682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall case 16: 10839682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall for ( i=cvt->len_cvt/4; i; --i ) { 10849682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[0] = src[0]; 10859682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[1] = src[1]; 10869682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall src += 4; 10879682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst += 2; 10889682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 10899682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall break; 10909682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 10919682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall cvt->len_cvt /= 2; 10929682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall if ( cvt->filters[++cvt->filter_index] ) { 10939682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall cvt->filters[cvt->filter_index](cvt, format); 10949682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 10959682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall} 10969682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 10979682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 10989682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall/* Convert rate down by multiple of 2, for stereo */ 10999682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hallvoid SDLCALL SDL_RateDIV2_c2(SDL_AudioCVT *cvt, Uint16 format) 11009682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall{ 11019682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall int i; 11029682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall Uint8 *src, *dst; 11039682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 11049682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall#ifdef DEBUG_CONVERT 11059682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall fprintf(stderr, "Converting audio rate / 2\n"); 11069682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall#endif 11079682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall src = cvt->buf; 11089682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst = cvt->buf; 11099682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall switch (format & 0xFF) { 11109682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall case 8: 11119682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall for ( i=cvt->len_cvt/4; i; --i ) { 11129682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[0] = src[0]; 11139682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[1] = src[1]; 11149682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall src += 4; 11159682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst += 2; 11169682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 11179682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall break; 11189682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall case 16: 11199682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall for ( i=cvt->len_cvt/8; i; --i ) { 11209682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[0] = src[0]; 11219682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[1] = src[1]; 11229682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[2] = src[2]; 11239682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[3] = src[3]; 11249682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall src += 8; 11259682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst += 4; 11269682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 11279682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall break; 11289682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 11299682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall cvt->len_cvt /= 2; 11309682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall if ( cvt->filters[++cvt->filter_index] ) { 11319682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall cvt->filters[cvt->filter_index](cvt, format); 11329682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 11339682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall} 11349682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 11359682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 11369682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall/* Convert rate down by multiple of 2, for quad */ 11379682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hallvoid SDLCALL SDL_RateDIV2_c4(SDL_AudioCVT *cvt, Uint16 format) 11389682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall{ 11399682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall int i; 11409682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall Uint8 *src, *dst; 11419682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 11429682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall#ifdef DEBUG_CONVERT 11439682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall fprintf(stderr, "Converting audio rate / 2\n"); 11449682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall#endif 11459682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall src = cvt->buf; 11469682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst = cvt->buf; 11479682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall switch (format & 0xFF) { 11489682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall case 8: 11499682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall for ( i=cvt->len_cvt/8; i; --i ) { 11509682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[0] = src[0]; 11519682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[1] = src[1]; 11529682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[2] = src[2]; 11539682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[3] = src[3]; 11549682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall src += 8; 11559682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst += 4; 11569682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 11579682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall break; 11589682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall case 16: 11599682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall for ( i=cvt->len_cvt/16; i; --i ) { 11609682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[0] = src[0]; 11619682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[1] = src[1]; 11629682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[2] = src[2]; 11639682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[3] = src[3]; 11649682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[4] = src[4]; 11659682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[5] = src[5]; 11669682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[6] = src[6]; 11679682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[7] = src[7]; 11689682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall src += 16; 11699682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst += 8; 11709682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 11719682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall break; 11729682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 11739682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall cvt->len_cvt /= 2; 11749682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall if ( cvt->filters[++cvt->filter_index] ) { 11759682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall cvt->filters[cvt->filter_index](cvt, format); 11769682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 11779682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall} 11789682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 11799682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall/* Convert rate down by multiple of 2, for 5.1 */ 11809682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hallvoid SDLCALL SDL_RateDIV2_c6(SDL_AudioCVT *cvt, Uint16 format) 11819682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall{ 11829682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall int i; 11839682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall Uint8 *src, *dst; 11849682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 11859682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall#ifdef DEBUG_CONVERT 11869682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall fprintf(stderr, "Converting audio rate / 2\n"); 11879682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall#endif 11889682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall src = cvt->buf; 11899682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst = cvt->buf; 11909682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall switch (format & 0xFF) { 11919682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall case 8: 11929682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall for ( i=cvt->len_cvt/12; i; --i ) { 11939682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[0] = src[0]; 11949682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[1] = src[1]; 11959682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[2] = src[2]; 11969682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[3] = src[3]; 11979682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[4] = src[4]; 11989682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[5] = src[5]; 11999682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall src += 12; 12009682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst += 6; 12019682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 12029682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall break; 12039682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall case 16: 12049682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall for ( i=cvt->len_cvt/24; i; --i ) { 12059682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[0] = src[0]; 12069682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[1] = src[1]; 12079682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[2] = src[2]; 12089682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[3] = src[3]; 12099682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[4] = src[4]; 12109682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[5] = src[5]; 12119682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[6] = src[6]; 12129682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[7] = src[7]; 12139682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[8] = src[8]; 12149682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[9] = src[9]; 12159682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[10] = src[10]; 12169682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst[11] = src[11]; 12179682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall src += 24; 12189682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall dst += 12; 12199682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 12209682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall break; 12219682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 12229682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall cvt->len_cvt /= 2; 12239682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall if ( cvt->filters[++cvt->filter_index] ) { 12249682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall cvt->filters[cvt->filter_index](cvt, format); 12259682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 12269682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall} 12279682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 12289682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall/* Very slow rate conversion routine */ 12299682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hallvoid SDLCALL SDL_RateSLOW(SDL_AudioCVT *cvt, Uint16 format) 12309682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall{ 12319682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall double ipos; 12329682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall int i, clen; 12339682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 12349682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall#ifdef DEBUG_CONVERT 12359682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall fprintf(stderr, "Converting audio rate * %4.4f\n", 1.0/cvt->rate_incr); 12369682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall#endif 12379682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall clen = (int)((double)cvt->len_cvt / cvt->rate_incr); 12389682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall if ( cvt->rate_incr > 1.0 ) { 12399682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall switch (format & 0xFF) { 12409682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall case 8: { 12419682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall Uint8 *output; 12429682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 12439682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall output = cvt->buf; 12449682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall ipos = 0.0; 12459682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall for ( i=clen; i; --i ) { 12469682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall *output = cvt->buf[(int)ipos]; 12479682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall ipos += cvt->rate_incr; 12489682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall output += 1; 12499682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 12509682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 12519682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall break; 12529682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 12539682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall case 16: { 12549682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall Uint16 *output; 12559682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 12569682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall clen &= ~1; 12579682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall output = (Uint16 *)cvt->buf; 12589682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall ipos = 0.0; 12599682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall for ( i=clen/2; i; --i ) { 12609682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall *output=((Uint16 *)cvt->buf)[(int)ipos]; 12619682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall ipos += cvt->rate_incr; 12629682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall output += 1; 12639682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 12649682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 12659682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall break; 12669682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 12679682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } else { 12689682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall switch (format & 0xFF) { 12699682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall case 8: { 12709682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall Uint8 *output; 12719682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 12729682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall output = cvt->buf+clen; 12739682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall ipos = (double)cvt->len_cvt; 12749682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall for ( i=clen; i; --i ) { 12759682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall ipos -= cvt->rate_incr; 12769682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall output -= 1; 12779682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall *output = cvt->buf[(int)ipos]; 12789682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 12799682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 12809682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall break; 12819682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 12829682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall case 16: { 12839682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall Uint16 *output; 12849682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 12859682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall clen &= ~1; 12869682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall output = (Uint16 *)(cvt->buf+clen); 12879682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall ipos = (double)cvt->len_cvt/2; 12889682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall for ( i=clen/2; i; --i ) { 12899682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall ipos -= cvt->rate_incr; 12909682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall output -= 1; 12919682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall *output=((Uint16 *)cvt->buf)[(int)ipos]; 12929682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 12939682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 12949682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall break; 12959682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 12969682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 12979682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall cvt->len_cvt = clen; 12989682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall if ( cvt->filters[++cvt->filter_index] ) { 12999682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall cvt->filters[cvt->filter_index](cvt, format); 13009682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 13019682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall} 13029682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 13039682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hallint SDL_ConvertAudio(SDL_AudioCVT *cvt) 13049682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall{ 13059682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall /* Make sure there's data to convert */ 13069682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall if ( cvt->buf == NULL ) { 13079682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall SDL_SetError("No buffer allocated for conversion"); 13089682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall return(-1); 13099682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 13109682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall /* Return okay if no conversion is necessary */ 13119682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall cvt->len_cvt = cvt->len; 13129682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall if ( cvt->filters[0] == NULL ) { 13139682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall return(0); 13149682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 13159682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 13169682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall /* Set up the conversion and go! */ 13179682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall cvt->filter_index = 0; 13189682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall cvt->filters[0](cvt, cvt->src_format); 13199682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall return(0); 13209682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall} 13219682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 13229682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall/* Creates a set of audio filters to convert from one format to another. 13239682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall Returns -1 if the format conversion is not supported, or 1 if the 13249682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall audio filter is set up. 13259682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall*/ 13269682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 13279682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hallint SDL_BuildAudioCVT(SDL_AudioCVT *cvt, 13289682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall Uint16 src_format, Uint8 src_channels, int src_rate, 13299682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall Uint16 dst_format, Uint8 dst_channels, int dst_rate) 13309682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall{ 13319682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall/*printf("Build format %04x->%04x, channels %u->%u, rate %d->%d\n", 13329682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall src_format, dst_format, src_channels, dst_channels, src_rate, dst_rate);*/ 13339682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall /* Start off with no conversion necessary */ 13349682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall cvt->needed = 0; 13359682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall cvt->filter_index = 0; 13369682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall cvt->filters[0] = NULL; 13379682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall cvt->len_mult = 1; 13389682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall cvt->len_ratio = 1.0; 13399682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 13409682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall /* First filter: Endian conversion from src to dst */ 13419682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall if ( (src_format & 0x1000) != (dst_format & 0x1000) 13429682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall && ((src_format & 0xff) == 16) && ((dst_format & 0xff) == 16)) { 13439682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall cvt->filters[cvt->filter_index++] = SDL_ConvertEndian; 13449682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 13459682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 13469682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall /* Second filter: Sign conversion -- signed/unsigned */ 13479682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall if ( (src_format & 0x8000) != (dst_format & 0x8000) ) { 13489682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall cvt->filters[cvt->filter_index++] = SDL_ConvertSign; 13499682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 13509682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 13519682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall /* Next filter: Convert 16 bit <--> 8 bit PCM */ 13529682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall if ( (src_format & 0xFF) != (dst_format & 0xFF) ) { 13539682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall switch (dst_format&0x10FF) { 13549682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall case AUDIO_U8: 13559682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall cvt->filters[cvt->filter_index++] = 13569682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall SDL_Convert8; 13579682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall cvt->len_ratio /= 2; 13589682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall break; 13599682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall case AUDIO_U16LSB: 13609682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall cvt->filters[cvt->filter_index++] = 13619682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall SDL_Convert16LSB; 13629682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall cvt->len_mult *= 2; 13639682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall cvt->len_ratio *= 2; 13649682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall break; 13659682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall case AUDIO_U16MSB: 13669682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall cvt->filters[cvt->filter_index++] = 13679682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall SDL_Convert16MSB; 13689682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall cvt->len_mult *= 2; 13699682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall cvt->len_ratio *= 2; 13709682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall break; 13719682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 13729682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 13739682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 13749682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall /* Last filter: Mono/Stereo conversion */ 13759682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall if ( src_channels != dst_channels ) { 13769682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall if ( (src_channels == 1) && (dst_channels > 1) ) { 13779682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall cvt->filters[cvt->filter_index++] = 13789682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall SDL_ConvertStereo; 13799682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall cvt->len_mult *= 2; 13809682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall src_channels = 2; 13819682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall cvt->len_ratio *= 2; 13829682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 13839682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall if ( (src_channels == 2) && 13849682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall (dst_channels == 6) ) { 13859682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall cvt->filters[cvt->filter_index++] = 13869682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall SDL_ConvertSurround; 13879682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall src_channels = 6; 13889682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall cvt->len_mult *= 3; 13899682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall cvt->len_ratio *= 3; 13909682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 13919682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall if ( (src_channels == 2) && 13929682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall (dst_channels == 4) ) { 13939682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall cvt->filters[cvt->filter_index++] = 13949682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall SDL_ConvertSurround_4; 13959682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall src_channels = 4; 13969682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall cvt->len_mult *= 2; 13979682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall cvt->len_ratio *= 2; 13989682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 13999682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall while ( (src_channels*2) <= dst_channels ) { 14009682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall cvt->filters[cvt->filter_index++] = 14019682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall SDL_ConvertStereo; 14029682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall cvt->len_mult *= 2; 14039682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall src_channels *= 2; 14049682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall cvt->len_ratio *= 2; 14059682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 14069682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall if ( (src_channels == 6) && 14079682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall (dst_channels <= 2) ) { 14089682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall cvt->filters[cvt->filter_index++] = 14099682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall SDL_ConvertStrip; 14109682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall src_channels = 2; 14119682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall cvt->len_ratio /= 3; 14129682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 14139682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall if ( (src_channels == 6) && 14149682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall (dst_channels == 4) ) { 14159682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall cvt->filters[cvt->filter_index++] = 14169682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall SDL_ConvertStrip_2; 14179682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall src_channels = 4; 14189682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall cvt->len_ratio /= 2; 14199682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 14209682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall /* This assumes that 4 channel audio is in the format: 14219682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall Left {front/back} + Right {front/back} 14229682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall so converting to L/R stereo works properly. 14239682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall */ 14249682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall while ( ((src_channels%2) == 0) && 14259682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall ((src_channels/2) >= dst_channels) ) { 14269682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall cvt->filters[cvt->filter_index++] = 14279682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall SDL_ConvertMono; 14289682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall src_channels /= 2; 14299682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall cvt->len_ratio /= 2; 14309682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 14319682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall if ( src_channels != dst_channels ) { 14329682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall /* Uh oh.. */; 14339682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 14349682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 14359682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 14369682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall /* Do rate conversion */ 14379682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall cvt->rate_incr = 0.0; 14389682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall if ( (src_rate/100) != (dst_rate/100) ) { 14399682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall Uint32 hi_rate, lo_rate; 14409682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall int len_mult; 14419682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall double len_ratio; 14429682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall void (SDLCALL *rate_cvt)(SDL_AudioCVT *cvt, Uint16 format); 14439682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 14449682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall if ( src_rate > dst_rate ) { 14459682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall hi_rate = src_rate; 14469682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall lo_rate = dst_rate; 14479682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall switch (src_channels) { 14489682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall case 1: rate_cvt = SDL_RateDIV2; break; 14499682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall case 2: rate_cvt = SDL_RateDIV2_c2; break; 14509682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall case 4: rate_cvt = SDL_RateDIV2_c4; break; 14519682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall case 6: rate_cvt = SDL_RateDIV2_c6; break; 14529682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall default: return -1; 14539682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 14549682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall len_mult = 1; 14559682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall len_ratio = 0.5; 14569682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } else { 14579682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall hi_rate = dst_rate; 14589682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall lo_rate = src_rate; 14599682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall switch (src_channels) { 14609682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall case 1: rate_cvt = SDL_RateMUL2; break; 14619682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall case 2: rate_cvt = SDL_RateMUL2_c2; break; 14629682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall case 4: rate_cvt = SDL_RateMUL2_c4; break; 14639682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall case 6: rate_cvt = SDL_RateMUL2_c6; break; 14649682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall default: return -1; 14659682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 14669682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall len_mult = 2; 14679682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall len_ratio = 2.0; 14689682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 14699682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall /* If hi_rate = lo_rate*2^x then conversion is easy */ 14709682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall while ( ((lo_rate*2)/100) <= (hi_rate/100) ) { 14719682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall cvt->filters[cvt->filter_index++] = rate_cvt; 14729682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall cvt->len_mult *= len_mult; 14739682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall lo_rate *= 2; 14749682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall cvt->len_ratio *= len_ratio; 14759682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 14769682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall /* We may need a slow conversion here to finish up */ 14779682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall if ( (lo_rate/100) != (hi_rate/100) ) { 14789682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall#if 1 14799682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall /* The problem with this is that if the input buffer is 14809682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall say 1K, and the conversion rate is say 1.1, then the 14819682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall output buffer is 1.1K, which may not be an acceptable 14829682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall buffer size for the audio driver (not a power of 2) 14839682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall */ 14849682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall /* For now, punt and hope the rate distortion isn't great. 14859682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall */ 14869682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall#else 14879682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall if ( src_rate < dst_rate ) { 14889682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall cvt->rate_incr = (double)lo_rate/hi_rate; 14899682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall cvt->len_mult *= 2; 14909682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall cvt->len_ratio /= cvt->rate_incr; 14919682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } else { 14929682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall cvt->rate_incr = (double)hi_rate/lo_rate; 14939682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall cvt->len_ratio *= cvt->rate_incr; 14949682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 14959682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall cvt->filters[cvt->filter_index++] = SDL_RateSLOW; 14969682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall#endif 14979682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 14989682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 14999682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 15009682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall /* Set up the filter information */ 15019682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall if ( cvt->filter_index != 0 ) { 15029682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall cvt->needed = 1; 15039682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall cvt->src_format = src_format; 15049682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall cvt->dst_format = dst_format; 15059682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall cvt->len = 0; 15069682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall cvt->buf = NULL; 15079682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall cvt->filters[cvt->filter_index] = NULL; 15089682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 15099682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall return(cvt->needed); 15109682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall} 1511