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 This driver was written by: 239682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall Erik Inge Bols� 249682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall knan@mo.himolde.no 259682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall*/ 269682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall#include "SDL_config.h" 279682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 289682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall/* Allow access to a raw mixing buffer */ 299682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 309682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall#include <signal.h> 319682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall#include <unistd.h> 329682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 339682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall#include "SDL_timer.h" 349682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall#include "SDL_audio.h" 359682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall#include "../SDL_audiomem.h" 369682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall#include "../SDL_audio_c.h" 379682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall#include "../SDL_audiodev_c.h" 389682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall#include "SDL_nasaudio.h" 399682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 409682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall#ifdef SDL_AUDIO_DRIVER_NAS_DYNAMIC 419682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall#include "SDL_loadso.h" 429682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall#endif 439682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 449682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall/* The tag name used by artsc audio */ 459682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall#define NAS_DRIVER_NAME "nas" 469682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 479682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hallstatic struct SDL_PrivateAudioData *this2 = NULL; 489682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 499682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hallstatic void (*NAS_AuCloseServer) (AuServer *); 509682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hallstatic void (*NAS_AuNextEvent) (AuServer *, AuBool, AuEvent *); 519682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hallstatic AuBool(*NAS_AuDispatchEvent) (AuServer *, AuEvent *); 529682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hallstatic AuFlowID(*NAS_AuCreateFlow) (AuServer *, AuStatus *); 539682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hallstatic void (*NAS_AuStartFlow) (AuServer *, AuFlowID, AuStatus *); 549682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hallstatic void (*NAS_AuSetElements) 559682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall (AuServer *, AuFlowID, AuBool, int, AuElement *, AuStatus *); 569682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hallstatic void (*NAS_AuWriteElement) 579682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall (AuServer *, AuFlowID, int, AuUint32, AuPointer, AuBool, AuStatus *); 589682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hallstatic AuServer *(*NAS_AuOpenServer) 599682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall (_AuConst char *, int, _AuConst char *, int, _AuConst char *, char **); 609682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hallstatic AuEventHandlerRec *(*NAS_AuRegisterEventHandler) 619682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall (AuServer *, AuMask, int, AuID, AuEventHandlerCallback, AuPointer); 629682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 639682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 649682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall#ifdef SDL_AUDIO_DRIVER_NAS_DYNAMIC 659682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 669682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hallstatic const char *nas_library = SDL_AUDIO_DRIVER_NAS_DYNAMIC; 679682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hallstatic void *nas_handle = NULL; 689682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 699682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hallstatic int 709682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hallload_nas_sym(const char *fn, void **addr) 719682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall{ 729682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall *addr = SDL_LoadFunction(nas_handle, fn); 739682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall if (*addr == NULL) { 749682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall return 0; 759682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 769682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall return 1; 779682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall} 789682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 799682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall/* cast funcs to char* first, to please GCC's strict aliasing rules. */ 809682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall#define SDL_NAS_SYM(x) \ 819682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall if (!load_nas_sym(#x, (void **) (char *) &NAS_##x)) return -1 829682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall#else 839682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall#define SDL_NAS_SYM(x) NAS_##x = x 849682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall#endif 859682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 869682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hallstatic int 879682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hallload_nas_syms(void) 889682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall{ 899682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall SDL_NAS_SYM(AuCloseServer); 909682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall SDL_NAS_SYM(AuNextEvent); 919682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall SDL_NAS_SYM(AuDispatchEvent); 929682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall SDL_NAS_SYM(AuCreateFlow); 939682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall SDL_NAS_SYM(AuStartFlow); 949682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall SDL_NAS_SYM(AuSetElements); 959682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall SDL_NAS_SYM(AuWriteElement); 969682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall SDL_NAS_SYM(AuOpenServer); 979682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall SDL_NAS_SYM(AuRegisterEventHandler); 989682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall return 0; 999682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall} 1009682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 1019682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall#undef SDL_NAS_SYM 1029682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 1039682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall#ifdef SDL_AUDIO_DRIVER_NAS_DYNAMIC 1049682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 1059682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hallstatic void 1069682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse HallUnloadNASLibrary(void) 1079682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall{ 1089682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall if (nas_handle != NULL) { 1099682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall SDL_UnloadObject(nas_handle); 1109682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall nas_handle = NULL; 1119682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 1129682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall} 1139682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 1149682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hallstatic int 1159682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse HallLoadNASLibrary(void) 1169682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall{ 1179682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall int retval = 0; 1189682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall if (nas_handle == NULL) { 1199682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall nas_handle = SDL_LoadObject(nas_library); 1209682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall if (nas_handle == NULL) { 1219682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall /* Copy error string so we can use it in a new SDL_SetError(). */ 1229682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall char *origerr = SDL_GetError(); 1239682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall size_t len = SDL_strlen(origerr) + 1; 1249682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall char *err = (char *) alloca(len); 1259682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall SDL_strlcpy(err, origerr, len); 1269682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall retval = -1; 1279682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall SDL_SetError("NAS: SDL_LoadObject('%s') failed: %s\n", 1289682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall nas_library, err); 1299682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } else { 1309682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall retval = load_nas_syms(); 1319682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall if (retval < 0) { 1329682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall UnloadNASLibrary(); 1339682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 1349682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 1359682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 1369682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall return retval; 1379682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall} 1389682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 1399682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall#else 1409682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 1419682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hallstatic void 1429682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse HallUnloadNASLibrary(void) 1439682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall{ 1449682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall} 1459682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 1469682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hallstatic int 1479682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse HallLoadNASLibrary(void) 1489682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall{ 1499682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall load_nas_syms(); 1509682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall return 0; 1519682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall} 1529682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 1539682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall#endif /* SDL_AUDIO_DRIVER_NAS_DYNAMIC */ 1549682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 1559682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 1569682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall/* Audio driver functions */ 1579682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hallstatic int NAS_OpenAudio(_THIS, SDL_AudioSpec *spec); 1589682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hallstatic void NAS_WaitAudio(_THIS); 1599682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hallstatic void NAS_PlayAudio(_THIS); 1609682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hallstatic Uint8 *NAS_GetAudioBuf(_THIS); 1619682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hallstatic void NAS_CloseAudio(_THIS); 1629682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 1639682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall/* Audio driver bootstrap functions */ 1649682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 1659682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hallstatic int Audio_Available(void) 1669682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall{ 1679682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall if (LoadNASLibrary() == 0) { 1689682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall AuServer *aud = NAS_AuOpenServer("", 0, NULL, 0, NULL, NULL); 1699682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall if (!aud) { 1709682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall UnloadNASLibrary(); 1719682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall return 0; 1729682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 1739682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall NAS_AuCloseServer(aud); 1749682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall UnloadNASLibrary(); 1759682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall return 1; 1769682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 1779682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall return 0; 1789682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall} 1799682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 1809682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hallstatic void Audio_DeleteDevice(SDL_AudioDevice *device) 1819682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall{ 1829682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall UnloadNASLibrary(); 1839682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall SDL_free(device->hidden); 1849682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall SDL_free(device); 1859682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall} 1869682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 1879682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hallstatic SDL_AudioDevice *Audio_CreateDevice(int devindex) 1889682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall{ 1899682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall SDL_AudioDevice *this; 1909682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 1919682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall if (LoadNASLibrary() < 0) { 1929682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall return NULL; 1939682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 1949682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 1959682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall /* Initialize all variables that we clean on shutdown */ 1969682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall this = (SDL_AudioDevice *)SDL_malloc(sizeof(SDL_AudioDevice)); 1979682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall if ( this ) { 1989682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall SDL_memset(this, 0, (sizeof *this)); 1999682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall this->hidden = (struct SDL_PrivateAudioData *) 2009682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall SDL_malloc((sizeof *this->hidden)); 2019682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 2029682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall if ( (this == NULL) || (this->hidden == NULL) ) { 2039682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall SDL_OutOfMemory(); 2049682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall if ( this ) { 2059682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall SDL_free(this); 2069682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 2079682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall return NULL; 2089682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 2099682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall SDL_memset(this->hidden, 0, (sizeof *this->hidden)); 2109682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 2119682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall /* Set the function pointers */ 2129682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall this->OpenAudio = NAS_OpenAudio; 2139682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall this->WaitAudio = NAS_WaitAudio; 2149682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall this->PlayAudio = NAS_PlayAudio; 2159682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall this->GetAudioBuf = NAS_GetAudioBuf; 2169682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall this->CloseAudio = NAS_CloseAudio; 2179682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 2189682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall this->free = Audio_DeleteDevice; 2199682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 2209682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall return this; 2219682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall} 2229682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 2239682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse HallAudioBootStrap NAS_bootstrap = { 2249682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall NAS_DRIVER_NAME, "Network Audio System", 2259682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall Audio_Available, Audio_CreateDevice 2269682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall}; 2279682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 2289682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall/* This function waits until it is possible to write a full sound buffer */ 2299682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hallstatic void NAS_WaitAudio(_THIS) 2309682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall{ 2319682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall while ( this->hidden->buf_free < this->hidden->mixlen ) { 2329682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall AuEvent ev; 2339682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall NAS_AuNextEvent(this->hidden->aud, AuTrue, &ev); 2349682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall NAS_AuDispatchEvent(this->hidden->aud, &ev); 2359682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 2369682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall} 2379682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 2389682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hallstatic void NAS_PlayAudio(_THIS) 2399682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall{ 2409682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall while (this->hidden->mixlen > this->hidden->buf_free) { /* We think the buffer is full? Yikes! Ask the server for events, 2419682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall in the hope that some of them is LowWater events telling us more 2429682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall of the buffer is free now than what we think. */ 2439682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall AuEvent ev; 2449682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall NAS_AuNextEvent(this->hidden->aud, AuTrue, &ev); 2459682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall NAS_AuDispatchEvent(this->hidden->aud, &ev); 2469682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 2479682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall this->hidden->buf_free -= this->hidden->mixlen; 2489682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 2499682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall /* Write the audio data */ 2509682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall NAS_AuWriteElement(this->hidden->aud, this->hidden->flow, 0, this->hidden->mixlen, this->hidden->mixbuf, AuFalse, NULL); 2519682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 2529682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall this->hidden->written += this->hidden->mixlen; 2539682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 2549682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall#ifdef DEBUG_AUDIO 2559682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall fprintf(stderr, "Wrote %d bytes of audio data\n", this->hidden->mixlen); 2569682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall#endif 2579682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall} 2589682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 2599682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hallstatic Uint8 *NAS_GetAudioBuf(_THIS) 2609682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall{ 2619682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall return(this->hidden->mixbuf); 2629682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall} 2639682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 2649682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hallstatic void NAS_CloseAudio(_THIS) 2659682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall{ 2669682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall if ( this->hidden->mixbuf != NULL ) { 2679682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall SDL_FreeAudioMem(this->hidden->mixbuf); 2689682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall this->hidden->mixbuf = NULL; 2699682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 2709682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall if ( this->hidden->aud ) { 2719682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall NAS_AuCloseServer(this->hidden->aud); 2729682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall this->hidden->aud = 0; 2739682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 2749682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall} 2759682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 2769682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hallstatic unsigned char sdlformat_to_auformat(unsigned int fmt) 2779682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall{ 2789682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall switch (fmt) 2799682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall { 2809682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall case AUDIO_U8: 2819682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall return AuFormatLinearUnsigned8; 2829682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall case AUDIO_S8: 2839682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall return AuFormatLinearSigned8; 2849682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall case AUDIO_U16LSB: 2859682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall return AuFormatLinearUnsigned16LSB; 2869682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall case AUDIO_U16MSB: 2879682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall return AuFormatLinearUnsigned16MSB; 2889682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall case AUDIO_S16LSB: 2899682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall return AuFormatLinearSigned16LSB; 2909682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall case AUDIO_S16MSB: 2919682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall return AuFormatLinearSigned16MSB; 2929682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 2939682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall return AuNone; 2949682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall} 2959682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 2969682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hallstatic AuBool 2979682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hallevent_handler(AuServer* aud, AuEvent* ev, AuEventHandlerRec* hnd) 2989682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall{ 2999682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall switch (ev->type) { 3009682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall case AuEventTypeElementNotify: { 3019682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall AuElementNotifyEvent* event = (AuElementNotifyEvent *)ev; 3029682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 3039682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall switch (event->kind) { 3049682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall case AuElementNotifyKindLowWater: 3059682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall if (this2->buf_free >= 0) { 3069682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall this2->really += event->num_bytes; 3079682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall gettimeofday(&this2->last_tv, 0); 3089682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall this2->buf_free += event->num_bytes; 3099682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } else { 3109682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall this2->buf_free = event->num_bytes; 3119682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 3129682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall break; 3139682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall case AuElementNotifyKindState: 3149682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall switch (event->cur_state) { 3159682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall case AuStatePause: 3169682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall if (event->reason != AuReasonUser) { 3179682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall if (this2->buf_free >= 0) { 3189682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall this2->really += event->num_bytes; 3199682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall gettimeofday(&this2->last_tv, 0); 3209682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall this2->buf_free += event->num_bytes; 3219682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } else { 3229682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall this2->buf_free = event->num_bytes; 3239682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 3249682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 3259682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall break; 3269682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 3279682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 3289682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 3299682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 3309682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall return AuTrue; 3319682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall} 3329682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 3339682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hallstatic AuDeviceID 3349682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hallfind_device(_THIS, int nch) 3359682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall{ 3369682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall /* These "Au" things are all macros, not functions... */ 3379682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall int i; 3389682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall for (i = 0; i < AuServerNumDevices(this->hidden->aud); i++) { 3399682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall if ((AuDeviceKind(AuServerDevice(this->hidden->aud, i)) == 3409682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall AuComponentKindPhysicalOutput) && 3419682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall AuDeviceNumTracks(AuServerDevice(this->hidden->aud, i)) == nch) { 3429682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall return AuDeviceIdentifier(AuServerDevice(this->hidden->aud, i)); 3439682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 3449682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 3459682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall return AuNone; 3469682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall} 3479682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 3489682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hallstatic int NAS_OpenAudio(_THIS, SDL_AudioSpec *spec) 3499682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall{ 3509682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall AuElement elms[3]; 3519682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall int buffer_size; 3529682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall Uint16 test_format, format; 3539682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 3549682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall this->hidden->mixbuf = NULL; 3559682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 3569682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall /* Try for a closest match on audio format */ 3579682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall format = 0; 3589682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall for ( test_format = SDL_FirstAudioFormat(spec->format); 3599682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall ! format && test_format; ) { 3609682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall format = sdlformat_to_auformat(test_format); 3619682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 3629682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall if (format == AuNone) { 3639682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall test_format = SDL_NextAudioFormat(); 3649682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 3659682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 3669682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall if ( format == 0 ) { 3679682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall SDL_SetError("Couldn't find any hardware audio formats"); 3689682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall return(-1); 3699682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 3709682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall spec->format = test_format; 3719682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 3729682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall this->hidden->aud = NAS_AuOpenServer("", 0, NULL, 0, NULL, NULL); 3739682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall if (this->hidden->aud == 0) 3749682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall { 3759682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall SDL_SetError("Couldn't open connection to NAS server"); 3769682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall return (-1); 3779682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 3789682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 3799682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall this->hidden->dev = find_device(this, spec->channels); 3809682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall if ((this->hidden->dev == AuNone) || (!(this->hidden->flow = NAS_AuCreateFlow(this->hidden->aud, NULL)))) { 3819682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall NAS_AuCloseServer(this->hidden->aud); 3829682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall this->hidden->aud = 0; 3839682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall SDL_SetError("Couldn't find a fitting playback device on NAS server"); 3849682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall return (-1); 3859682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 3869682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 3879682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall buffer_size = spec->freq; 3889682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall if (buffer_size < 4096) 3899682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall buffer_size = 4096; 3909682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 3919682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall if (buffer_size > 32768) 3929682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall buffer_size = 32768; /* So that the buffer won't get unmanageably big. */ 3939682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 3949682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall /* Calculate the final parameters for this audio specification */ 3959682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall SDL_CalculateAudioSpec(spec); 3969682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 3979682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall this2 = this->hidden; 3989682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 3999682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall /* These "Au" things without a NAS_ prefix are macros, not functions... */ 4009682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall AuMakeElementImportClient(elms, spec->freq, format, spec->channels, AuTrue, 4019682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall buffer_size, buffer_size / 4, 0, NULL); 4029682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall AuMakeElementExportDevice(elms+1, 0, this->hidden->dev, spec->freq, 4039682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall AuUnlimitedSamples, 0, NULL); 4049682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall NAS_AuSetElements(this->hidden->aud, this->hidden->flow, AuTrue, 2, elms, NULL); 4059682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall NAS_AuRegisterEventHandler(this->hidden->aud, AuEventHandlerIDMask, 0, this->hidden->flow, 4069682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall event_handler, (AuPointer) NULL); 4079682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 4089682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall NAS_AuStartFlow(this->hidden->aud, this->hidden->flow, NULL); 4099682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 4109682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall /* Allocate mixing buffer */ 4119682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall this->hidden->mixlen = spec->size; 4129682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall this->hidden->mixbuf = (Uint8 *)SDL_AllocAudioMem(this->hidden->mixlen); 4139682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall if ( this->hidden->mixbuf == NULL ) { 4149682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall return(-1); 4159682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 4169682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall SDL_memset(this->hidden->mixbuf, spec->silence, spec->size); 4179682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 4189682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall /* Get the parent process id (we're the parent of the audio thread) */ 4199682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall this->hidden->parent = getpid(); 4209682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 4219682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall /* We're ready to rock and roll. :-) */ 4229682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall return(0); 4239682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall} 424