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*/ 239682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall#include "SDL_config.h" 249682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 259682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall/* Output dreamcast aica */ 269682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 279682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall#include "SDL_timer.h" 289682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall#include "SDL_audio.h" 299682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall#include "../SDL_audiomem.h" 309682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall#include "../SDL_audio_c.h" 319682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall#include "../SDL_audiodev_c.h" 329682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall#include "SDL_dcaudio.h" 339682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 349682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall#include "aica.h" 359682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall#include <dc/spu.h> 369682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 379682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall/* Audio driver functions */ 389682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hallstatic int DCAUD_OpenAudio(_THIS, SDL_AudioSpec *spec); 399682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hallstatic void DCAUD_WaitAudio(_THIS); 409682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hallstatic void DCAUD_PlayAudio(_THIS); 419682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hallstatic Uint8 *DCAUD_GetAudioBuf(_THIS); 429682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hallstatic void DCAUD_CloseAudio(_THIS); 439682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 449682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall/* Audio driver bootstrap functions */ 459682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hallstatic int DCAUD_Available(void) 469682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall{ 479682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall return 1; 489682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall} 499682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 509682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hallstatic void DCAUD_DeleteDevice(SDL_AudioDevice *device) 519682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall{ 529682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall SDL_free(device->hidden); 539682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall SDL_free(device); 549682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall} 559682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 569682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hallstatic SDL_AudioDevice *DCAUD_CreateDevice(int devindex) 579682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall{ 589682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall SDL_AudioDevice *this; 599682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 609682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall /* Initialize all variables that we clean on shutdown */ 619682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall this = (SDL_AudioDevice *)SDL_malloc(sizeof(SDL_AudioDevice)); 629682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall if ( this ) { 639682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall SDL_memset(this, 0, (sizeof *this)); 649682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall this->hidden = (struct SDL_PrivateAudioData *) 659682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall SDL_malloc((sizeof *this->hidden)); 669682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 679682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall if ( (this == NULL) || (this->hidden == NULL) ) { 689682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall SDL_OutOfMemory(); 699682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall if ( this ) { 709682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall SDL_free(this); 719682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 729682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall return(0); 739682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 749682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall SDL_memset(this->hidden, 0, (sizeof *this->hidden)); 759682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 769682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall /* Set the function pointers */ 779682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall this->OpenAudio = DCAUD_OpenAudio; 789682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall this->WaitAudio = DCAUD_WaitAudio; 799682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall this->PlayAudio = DCAUD_PlayAudio; 809682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall this->GetAudioBuf = DCAUD_GetAudioBuf; 819682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall this->CloseAudio = DCAUD_CloseAudio; 829682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 839682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall this->free = DCAUD_DeleteDevice; 849682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 859682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall spu_init(); 869682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 879682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall return this; 889682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall} 899682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 909682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse HallAudioBootStrap DCAUD_bootstrap = { 919682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall "dcaudio", "Dreamcast AICA audio", 929682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall DCAUD_Available, DCAUD_CreateDevice 939682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall}; 949682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 959682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall/* This function waits until it is possible to write a full sound buffer */ 969682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hallstatic void DCAUD_WaitAudio(_THIS) 979682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall{ 989682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall if (this->hidden->playing) { 999682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall /* wait */ 1009682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall while(aica_get_pos(0)/this->spec.samples == this->hidden->nextbuf) { 1019682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall thd_pass(); 1029682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 1039682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 1049682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall} 1059682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 1069682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall#define SPU_RAM_BASE 0xa0800000 1079682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 1089682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hallstatic void spu_memload_stereo8(int leftpos,int rightpos,void *src0,size_t size) 1099682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall{ 1109682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall uint8 *src = src0; 1119682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall uint32 *left = (uint32*)(leftpos +SPU_RAM_BASE); 1129682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall uint32 *right = (uint32*)(rightpos+SPU_RAM_BASE); 1139682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall size = (size+7)/8; 1149682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall while(size--) { 1159682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall unsigned lval,rval; 1169682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall lval = *src++; 1179682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall rval = *src++; 1189682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall lval|= (*src++)<<8; 1199682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall rval|= (*src++)<<8; 1209682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall lval|= (*src++)<<16; 1219682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall rval|= (*src++)<<16; 1229682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall lval|= (*src++)<<24; 1239682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall rval|= (*src++)<<24; 1249682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall g2_write_32(left++,lval); 1259682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall g2_write_32(right++,rval); 1269682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall g2_fifo_wait(); 1279682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 1289682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall} 1299682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 1309682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hallstatic void spu_memload_stereo16(int leftpos,int rightpos,void *src0,size_t size) 1319682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall{ 1329682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall uint16 *src = src0; 1339682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall uint32 *left = (uint32*)(leftpos +SPU_RAM_BASE); 1349682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall uint32 *right = (uint32*)(rightpos+SPU_RAM_BASE); 1359682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall size = (size+7)/8; 1369682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall while(size--) { 1379682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall unsigned lval,rval; 1389682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall lval = *src++; 1399682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall rval = *src++; 1409682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall lval|= (*src++)<<16; 1419682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall rval|= (*src++)<<16; 1429682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall g2_write_32(left++,lval); 1439682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall g2_write_32(right++,rval); 1449682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall g2_fifo_wait(); 1459682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 1469682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall} 1479682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 1489682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hallstatic void DCAUD_PlayAudio(_THIS) 1499682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall{ 1509682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall SDL_AudioSpec *spec = &this->spec; 1519682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall unsigned int offset; 1529682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 1539682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall if (this->hidden->playing) { 1549682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall /* wait */ 1559682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall while(aica_get_pos(0)/spec->samples == this->hidden->nextbuf) { 1569682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall thd_pass(); 1579682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 1589682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 1599682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 1609682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall offset = this->hidden->nextbuf*spec->size; 1619682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall this->hidden->nextbuf^=1; 1629682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall /* Write the audio data, checking for EAGAIN on broken audio drivers */ 1639682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall if (spec->channels==1) { 1649682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall spu_memload(this->hidden->leftpos+offset,this->hidden->mixbuf,this->hidden->mixlen); 1659682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } else { 1669682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall offset/=2; 1679682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall if ((this->spec.format&255)==8) { 1689682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall spu_memload_stereo8(this->hidden->leftpos+offset,this->hidden->rightpos+offset,this->hidden->mixbuf,this->hidden->mixlen); 1699682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } else { 1709682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall spu_memload_stereo16(this->hidden->leftpos+offset,this->hidden->rightpos+offset,this->hidden->mixbuf,this->hidden->mixlen); 1719682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 1729682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 1739682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 1749682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall if (!this->hidden->playing) { 1759682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall int mode; 1769682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall this->hidden->playing = 1; 1779682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall mode = (spec->format==AUDIO_S8)?SM_8BIT:SM_16BIT; 1789682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall if (spec->channels==1) { 1799682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall aica_play(0,mode,this->hidden->leftpos,0,spec->samples*2,spec->freq,255,128,1); 1809682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } else { 1819682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall aica_play(0,mode,this->hidden->leftpos ,0,spec->samples*2,spec->freq,255,0,1); 1829682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall aica_play(1,mode,this->hidden->rightpos,0,spec->samples*2,spec->freq,255,255,1); 1839682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 1849682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 1859682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall} 1869682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 1879682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hallstatic Uint8 *DCAUD_GetAudioBuf(_THIS) 1889682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall{ 1899682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall return(this->hidden->mixbuf); 1909682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall} 1919682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 1929682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hallstatic void DCAUD_CloseAudio(_THIS) 1939682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall{ 1949682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall aica_stop(0); 1959682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall if (this->spec.channels==2) aica_stop(1); 1969682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall if ( this->hidden->mixbuf != NULL ) { 1979682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall SDL_FreeAudioMem(this->hidden->mixbuf); 1989682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall this->hidden->mixbuf = NULL; 1999682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 2009682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall} 2019682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 2029682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hallstatic int DCAUD_OpenAudio(_THIS, SDL_AudioSpec *spec) 2039682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall{ 2049682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall Uint16 test_format = SDL_FirstAudioFormat(spec->format); 2059682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall int valid_datatype = 0; 2069682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall while ((!valid_datatype) && (test_format)) { 2079682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall spec->format = test_format; 2089682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall switch (test_format) { 2099682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall /* only formats Dreamcast accepts... */ 2109682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall case AUDIO_S8: 2119682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall case AUDIO_S16LSB: 2129682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall valid_datatype = 1; 2139682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall break; 2149682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 2159682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall default: 2169682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall test_format = SDL_NextAudioFormat(); 2179682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall break; 2189682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 2199682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 2209682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 2219682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall if (!valid_datatype) { /* shouldn't happen, but just in case... */ 2229682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall SDL_SetError("Unsupported audio format"); 2239682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall return (-1); 2249682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 2259682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 2269682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall if (spec->channels > 2) 2279682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall spec->channels = 2; /* no more than stereo on the Dreamcast. */ 2289682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 2299682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall /* Update the fragment size as size in bytes */ 2309682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall SDL_CalculateAudioSpec(spec); 2319682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 2329682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall /* Allocate mixing buffer */ 2339682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall this->hidden->mixlen = spec->size; 2349682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall this->hidden->mixbuf = (Uint8 *) SDL_AllocAudioMem(this->hidden->mixlen); 2359682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall if ( this->hidden->mixbuf == NULL ) { 2369682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall return(-1); 2379682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 2389682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall SDL_memset(this->hidden->mixbuf, spec->silence, spec->size); 2399682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall this->hidden->leftpos = 0x11000; 2409682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall this->hidden->rightpos = 0x11000+spec->size; 2419682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall this->hidden->playing = 0; 2429682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall this->hidden->nextbuf = 0; 2439682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 2449682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall /* We're ready to rock and roll. :-) */ 2459682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall return(0); 2469682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall} 247