diff options
Diffstat (limited to 'distrib/sdl-1.2.12/src/audio/SDL_audio.c')
| -rw-r--r-- | distrib/sdl-1.2.12/src/audio/SDL_audio.c | 695 |
1 files changed, 0 insertions, 695 deletions
diff --git a/distrib/sdl-1.2.12/src/audio/SDL_audio.c b/distrib/sdl-1.2.12/src/audio/SDL_audio.c deleted file mode 100644 index 3e2316d..0000000 --- a/distrib/sdl-1.2.12/src/audio/SDL_audio.c +++ /dev/null @@ -1,695 +0,0 @@ -/* - SDL - Simple DirectMedia Layer - Copyright (C) 1997-2006 Sam Lantinga - - This library is free software; you can redistribute it and/or - modify it under the terms of the GNU Lesser General Public - License as published by the Free Software Foundation; either - version 2.1 of the License, or (at your option) any later version. - - This library is distributed in the hope that it will be useful, - but WITHOUT ANY WARRANTY; without even the implied warranty of - MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - Lesser General Public License for more details. - - You should have received a copy of the GNU Lesser General Public - License along with this library; if not, write to the Free Software - Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA - - Sam Lantinga - slouken@libsdl.org -*/ -#include "SDL_config.h" - -/* Allow access to a raw mixing buffer */ - -#include "SDL.h" -#include "SDL_audio_c.h" -#include "SDL_audiomem.h" -#include "SDL_sysaudio.h" - -#ifdef __OS2__ -/* We'll need the DosSetPriority() API! */ -#define INCL_DOSPROCESS -#include <os2.h> -#endif - -/* Available audio drivers */ -static AudioBootStrap *bootstrap[] = { -#if SDL_AUDIO_DRIVER_BSD - &BSD_AUDIO_bootstrap, -#endif -#if SDL_AUDIO_DRIVER_OSS - &DSP_bootstrap, - &DMA_bootstrap, -#endif -#if SDL_AUDIO_DRIVER_ALSA - &ALSA_bootstrap, -#endif -#if SDL_AUDIO_DRIVER_PULSE - &PULSE_bootstrap, -#endif -#if SDL_AUDIO_DRIVER_QNXNTO - &QNXNTOAUDIO_bootstrap, -#endif -#if SDL_AUDIO_DRIVER_SUNAUDIO - &SUNAUDIO_bootstrap, -#endif -#if SDL_AUDIO_DRIVER_DMEDIA - &DMEDIA_bootstrap, -#endif -#if SDL_AUDIO_DRIVER_ARTS - &ARTS_bootstrap, -#endif -#if SDL_AUDIO_DRIVER_ESD - &ESD_bootstrap, -#endif -#if SDL_AUDIO_DRIVER_NAS - &NAS_bootstrap, -#endif -#if SDL_AUDIO_DRIVER_DSOUND - &DSOUND_bootstrap, -#endif -#if SDL_AUDIO_DRIVER_WAVEOUT - &WAVEOUT_bootstrap, -#endif -#if SDL_AUDIO_DRIVER_PAUD - &Paud_bootstrap, -#endif -#if SDL_AUDIO_DRIVER_BAUDIO - &BAUDIO_bootstrap, -#endif -#if SDL_AUDIO_DRIVER_COREAUDIO - &COREAUDIO_bootstrap, -#endif -#if SDL_AUDIO_DRIVER_SNDMGR - &SNDMGR_bootstrap, -#endif -#if SDL_AUDIO_DRIVER_MINT - &MINTAUDIO_GSXB_bootstrap, - &MINTAUDIO_MCSN_bootstrap, - &MINTAUDIO_STFA_bootstrap, - &MINTAUDIO_XBIOS_bootstrap, - &MINTAUDIO_DMA8_bootstrap, -#endif -#if SDL_AUDIO_DRIVER_DISK - &DISKAUD_bootstrap, -#endif -#if SDL_AUDIO_DRIVER_DUMMY - &DUMMYAUD_bootstrap, -#endif -#if SDL_AUDIO_DRIVER_DC - &DCAUD_bootstrap, -#endif -#if SDL_AUDIO_DRIVER_NDS - &NDSAUD_bootstrap, -#endif -#if SDL_AUDIO_DRIVER_MMEAUDIO - &MMEAUDIO_bootstrap, -#endif -#if SDL_AUDIO_DRIVER_DART - &DART_bootstrap, -#endif -#if SDL_AUDIO_DRIVER_EPOCAUDIO - &EPOCAudio_bootstrap, -#endif - NULL -}; -SDL_AudioDevice *current_audio = NULL; - -/* Various local functions */ -int SDL_AudioInit(const char *driver_name); -void SDL_AudioQuit(void); - -/* The general mixing thread function */ -int SDLCALL SDL_RunAudio(void *audiop) -{ - SDL_AudioDevice *audio = (SDL_AudioDevice *)audiop; - Uint8 *stream; - int stream_len; - void *udata; - void (SDLCALL *fill)(void *userdata,Uint8 *stream, int len); - int silence; - - /* Perform any thread setup */ - if ( audio->ThreadInit ) { - audio->ThreadInit(audio); - } - audio->threadid = SDL_ThreadID(); - - /* Set up the mixing function */ - fill = audio->spec.callback; - udata = audio->spec.userdata; - - if ( audio->convert.needed ) { - if ( audio->convert.src_format == AUDIO_U8 ) { - silence = 0x80; - } else { - silence = 0; - } - stream_len = audio->convert.len; - } else { - silence = audio->spec.silence; - stream_len = audio->spec.size; - } - -#ifdef __OS2__ - /* Increase the priority of this thread to make sure that - the audio will be continuous all the time! */ -#ifdef USE_DOSSETPRIORITY - if (SDL_getenv("SDL_USE_TIMECRITICAL_AUDIO")) - { -#ifdef DEBUG_BUILD - printf("[SDL_RunAudio] : Setting priority to TimeCritical+0! (TID%d)\n", SDL_ThreadID()); -#endif - DosSetPriority(PRTYS_THREAD, PRTYC_TIMECRITICAL, 0, 0); - } - else - { -#ifdef DEBUG_BUILD - printf("[SDL_RunAudio] : Setting priority to ForegroundServer+0! (TID%d)\n", SDL_ThreadID()); -#endif - DosSetPriority(PRTYS_THREAD, PRTYC_FOREGROUNDSERVER, 0, 0); - } -#endif -#endif - - /* Loop, filling the audio buffers */ - while ( audio->enabled ) { - - /* Fill the current buffer with sound */ - if ( audio->convert.needed ) { - if ( audio->convert.buf ) { - stream = audio->convert.buf; - } else { - continue; - } - } else { - stream = audio->GetAudioBuf(audio); - if ( stream == NULL ) { - stream = audio->fake_stream; - } - } - - SDL_memset(stream, silence, stream_len); - - if ( ! audio->paused ) { - SDL_mutexP(audio->mixer_lock); - (*fill)(udata, stream, stream_len); - SDL_mutexV(audio->mixer_lock); - } - - /* Convert the audio if necessary */ - if ( audio->convert.needed ) { - SDL_ConvertAudio(&audio->convert); - stream = audio->GetAudioBuf(audio); - if ( stream == NULL ) { - stream = audio->fake_stream; - } - SDL_memcpy(stream, audio->convert.buf, - audio->convert.len_cvt); - } - - /* Ready current buffer for play and change current buffer */ - if ( stream != audio->fake_stream ) { - audio->PlayAudio(audio); - } - - /* Wait for an audio buffer to become available */ - if ( stream == audio->fake_stream ) { - SDL_Delay((audio->spec.samples*1000)/audio->spec.freq); - } else { - audio->WaitAudio(audio); - } - } - - /* Wait for the audio to drain.. */ - if ( audio->WaitDone ) { - audio->WaitDone(audio); - } - -#ifdef __OS2__ -#ifdef DEBUG_BUILD - printf("[SDL_RunAudio] : Task exiting. (TID%d)\n", SDL_ThreadID()); -#endif -#endif - return(0); -} - -static void SDL_LockAudio_Default(SDL_AudioDevice *audio) -{ - if ( audio->thread && (SDL_ThreadID() == audio->threadid) ) { - return; - } - SDL_mutexP(audio->mixer_lock); -} - -static void SDL_UnlockAudio_Default(SDL_AudioDevice *audio) -{ - if ( audio->thread && (SDL_ThreadID() == audio->threadid) ) { - return; - } - SDL_mutexV(audio->mixer_lock); -} - -static Uint16 SDL_ParseAudioFormat(const char *string) -{ - Uint16 format = 0; - - switch (*string) { - case 'U': - ++string; - format |= 0x0000; - break; - case 'S': - ++string; - format |= 0x8000; - break; - default: - return 0; - } - switch (SDL_atoi(string)) { - case 8: - string += 1; - format |= 8; - break; - case 16: - string += 2; - format |= 16; - if ( SDL_strcmp(string, "LSB") == 0 -#if SDL_BYTEORDER == SDL_LIL_ENDIAN - || SDL_strcmp(string, "SYS") == 0 -#endif - ) { - format |= 0x0000; - } - if ( SDL_strcmp(string, "MSB") == 0 -#if SDL_BYTEORDER == SDL_BIG_ENDIAN - || SDL_strcmp(string, "SYS") == 0 -#endif - ) { - format |= 0x1000; - } - break; - default: - return 0; - } - return format; -} - -int SDL_AudioInit(const char *driver_name) -{ - SDL_AudioDevice *audio; - int i = 0, idx; - - /* Check to make sure we don't overwrite 'current_audio' */ - if ( current_audio != NULL ) { - SDL_AudioQuit(); - } - - /* Select the proper audio driver */ - audio = NULL; - idx = 0; -#if SDL_AUDIO_DRIVER_ESD - if ( (driver_name == NULL) && (SDL_getenv("ESPEAKER") != NULL) ) { - /* Ahem, we know that if ESPEAKER is set, user probably wants - to use ESD, but don't start it if it's not already running. - This probably isn't the place to do this, but... Shh! :) - */ - for ( i=0; bootstrap[i]; ++i ) { - if ( SDL_strcasecmp(bootstrap[i]->name, "esd") == 0 ) { -#ifdef HAVE_PUTENV - const char *esd_no_spawn; - - /* Don't start ESD if it's not running */ - esd_no_spawn = getenv("ESD_NO_SPAWN"); - if ( esd_no_spawn == NULL ) { - putenv("ESD_NO_SPAWN=1"); - } -#endif - if ( bootstrap[i]->available() ) { - audio = bootstrap[i]->create(0); - break; - } -#ifdef HAVE_UNSETENV - if ( esd_no_spawn == NULL ) { - unsetenv("ESD_NO_SPAWN"); - } -#endif - } - } - } -#endif /* SDL_AUDIO_DRIVER_ESD */ - if ( audio == NULL ) { - if ( driver_name != NULL ) { -#if 0 /* This will be replaced with a better driver selection API */ - if ( SDL_strrchr(driver_name, ':') != NULL ) { - idx = atoi(SDL_strrchr(driver_name, ':')+1); - } -#endif - for ( i=0; bootstrap[i]; ++i ) { - if (SDL_strcasecmp(bootstrap[i]->name, driver_name) == 0) { - if ( bootstrap[i]->available() ) { - audio=bootstrap[i]->create(idx); - break; - } - } - } - } else { - for ( i=0; bootstrap[i]; ++i ) { - if ( bootstrap[i]->available() ) { - audio = bootstrap[i]->create(idx); - if ( audio != NULL ) { - break; - } - } - } - } - if ( audio == NULL ) { - SDL_SetError("No available audio device"); -#if 0 /* Don't fail SDL_Init() if audio isn't available. - SDL_OpenAudio() will handle it at that point. *sigh* - */ - return(-1); -#endif - } - } - current_audio = audio; - if ( current_audio ) { - current_audio->name = bootstrap[i]->name; - if ( !current_audio->LockAudio && !current_audio->UnlockAudio ) { - current_audio->LockAudio = SDL_LockAudio_Default; - current_audio->UnlockAudio = SDL_UnlockAudio_Default; - } - } - return(0); -} - -char *SDL_AudioDriverName(char *namebuf, int maxlen) -{ - if ( current_audio != NULL ) { - SDL_strlcpy(namebuf, current_audio->name, maxlen); - return(namebuf); - } - return(NULL); -} - -int SDL_OpenAudio(SDL_AudioSpec *desired, SDL_AudioSpec *obtained) -{ - SDL_AudioDevice *audio; - const char *env; - - /* Start up the audio driver, if necessary */ - if ( ! current_audio ) { - if ( (SDL_InitSubSystem(SDL_INIT_AUDIO) < 0) || - (current_audio == NULL) ) { - return(-1); - } - } - audio = current_audio; - - if (audio->opened) { - SDL_SetError("Audio device is already opened"); - return(-1); - } - - /* Verify some parameters */ - if ( desired->freq == 0 ) { - env = SDL_getenv("SDL_AUDIO_FREQUENCY"); - if ( env ) { - desired->freq = SDL_atoi(env); - } - } - if ( desired->freq == 0 ) { - /* Pick some default audio frequency */ - desired->freq = 22050; - } - if ( desired->format == 0 ) { - env = SDL_getenv("SDL_AUDIO_FORMAT"); - if ( env ) { - desired->format = SDL_ParseAudioFormat(env); - } - } - if ( desired->format == 0 ) { - /* Pick some default audio format */ - desired->format = AUDIO_S16; - } - if ( desired->channels == 0 ) { - env = SDL_getenv("SDL_AUDIO_CHANNELS"); - if ( env ) { - desired->channels = (Uint8)SDL_atoi(env); - } - } - if ( desired->channels == 0 ) { - /* Pick a default number of channels */ - desired->channels = 2; - } - switch ( desired->channels ) { - case 1: /* Mono */ - case 2: /* Stereo */ - case 4: /* surround */ - case 6: /* surround with center and lfe */ - break; - default: - SDL_SetError("1 (mono) and 2 (stereo) channels supported"); - return(-1); - } - if ( desired->samples == 0 ) { - env = SDL_getenv("SDL_AUDIO_SAMPLES"); - if ( env ) { - desired->samples = (Uint16)SDL_atoi(env); - } - } - if ( desired->samples == 0 ) { - /* Pick a default of ~46 ms at desired frequency */ - int samples = (desired->freq / 1000) * 46; - int power2 = 1; - while ( power2 < samples ) { - power2 *= 2; - } - desired->samples = power2; - } - if ( desired->callback == NULL ) { - SDL_SetError("SDL_OpenAudio() passed a NULL callback"); - return(-1); - } - -#if SDL_THREADS_DISABLED - /* Uses interrupt driven audio, without thread */ -#else - /* Create a semaphore for locking the sound buffers */ - audio->mixer_lock = SDL_CreateMutex(); - if ( audio->mixer_lock == NULL ) { - SDL_SetError("Couldn't create mixer lock"); - SDL_CloseAudio(); - return(-1); - } -#endif /* SDL_THREADS_DISABLED */ - - /* Calculate the silence and size of the audio specification */ - SDL_CalculateAudioSpec(desired); - - /* Open the audio subsystem */ - SDL_memcpy(&audio->spec, desired, sizeof(audio->spec)); - audio->convert.needed = 0; - audio->enabled = 1; - audio->paused = 1; - - audio->opened = audio->OpenAudio(audio, &audio->spec)+1; - - if ( ! audio->opened ) { - SDL_CloseAudio(); - return(-1); - } - - /* If the audio driver changes the buffer size, accept it */ - if ( audio->spec.samples != desired->samples ) { - desired->samples = audio->spec.samples; - SDL_CalculateAudioSpec(desired); - } - - /* Allocate a fake audio memory buffer */ - audio->fake_stream = SDL_AllocAudioMem(audio->spec.size); - if ( audio->fake_stream == NULL ) { - SDL_CloseAudio(); - SDL_OutOfMemory(); - return(-1); - } - - /* See if we need to do any conversion */ - if ( obtained != NULL ) { - SDL_memcpy(obtained, &audio->spec, sizeof(audio->spec)); - } else if ( desired->freq != audio->spec.freq || - desired->format != audio->spec.format || - desired->channels != audio->spec.channels ) { - /* Build an audio conversion block */ - if ( SDL_BuildAudioCVT(&audio->convert, - desired->format, desired->channels, - desired->freq, - audio->spec.format, audio->spec.channels, - audio->spec.freq) < 0 ) { - SDL_CloseAudio(); - return(-1); - } - if ( audio->convert.needed ) { - audio->convert.len = (int) ( ((double) desired->size) / - audio->convert.len_ratio ); - audio->convert.buf =(Uint8 *)SDL_AllocAudioMem( - audio->convert.len*audio->convert.len_mult); - if ( audio->convert.buf == NULL ) { - SDL_CloseAudio(); - SDL_OutOfMemory(); - return(-1); - } - } - } - - /* Start the audio thread if necessary */ - switch (audio->opened) { - case 1: - /* Start the audio thread */ -#if (defined(__WIN32__) && !defined(_WIN32_WCE)) && !defined(HAVE_LIBC) && !defined(__SYMBIAN32__) -#undef SDL_CreateThread - audio->thread = SDL_CreateThread(SDL_RunAudio, audio, NULL, NULL); -#else - audio->thread = SDL_CreateThread(SDL_RunAudio, audio); -#endif - if ( audio->thread == NULL ) { - SDL_CloseAudio(); - SDL_SetError("Couldn't create audio thread"); - return(-1); - } - break; - - default: - /* The audio is now playing */ - break; - } - - return(0); -} - -SDL_audiostatus SDL_GetAudioStatus(void) -{ - SDL_AudioDevice *audio = current_audio; - SDL_audiostatus status; - - status = SDL_AUDIO_STOPPED; - if ( audio && audio->enabled ) { - if ( audio->paused ) { - status = SDL_AUDIO_PAUSED; - } else { - status = SDL_AUDIO_PLAYING; - } - } - return(status); -} - -void SDL_PauseAudio (int pause_on) -{ - SDL_AudioDevice *audio = current_audio; - - if ( audio ) { - audio->paused = pause_on; - } -} - -void SDL_LockAudio (void) -{ - SDL_AudioDevice *audio = current_audio; - - /* Obtain a lock on the mixing buffers */ - if ( audio && audio->LockAudio ) { - audio->LockAudio(audio); - } -} - -void SDL_UnlockAudio (void) -{ - SDL_AudioDevice *audio = current_audio; - - /* Release lock on the mixing buffers */ - if ( audio && audio->UnlockAudio ) { - audio->UnlockAudio(audio); - } -} - -void SDL_CloseAudio (void) -{ - SDL_QuitSubSystem(SDL_INIT_AUDIO); -} - -void SDL_AudioQuit(void) -{ - SDL_AudioDevice *audio = current_audio; - - if ( audio ) { - audio->enabled = 0; - if ( audio->thread != NULL ) { - SDL_WaitThread(audio->thread, NULL); - } - if ( audio->mixer_lock != NULL ) { - SDL_DestroyMutex(audio->mixer_lock); - } - if ( audio->fake_stream != NULL ) { - SDL_FreeAudioMem(audio->fake_stream); - } - if ( audio->convert.needed ) { - SDL_FreeAudioMem(audio->convert.buf); - - } - if ( audio->opened ) { - audio->CloseAudio(audio); - audio->opened = 0; - } - /* Free the driver data */ - audio->free(audio); - current_audio = NULL; - } -} - -#define NUM_FORMATS 6 -static int format_idx; -static int format_idx_sub; -static Uint16 format_list[NUM_FORMATS][NUM_FORMATS] = { - { AUDIO_U8, AUDIO_S8, AUDIO_S16LSB, AUDIO_S16MSB, AUDIO_U16LSB, AUDIO_U16MSB }, - { AUDIO_S8, AUDIO_U8, AUDIO_S16LSB, AUDIO_S16MSB, AUDIO_U16LSB, AUDIO_U16MSB }, - { AUDIO_S16LSB, AUDIO_S16MSB, AUDIO_U16LSB, AUDIO_U16MSB, AUDIO_U8, AUDIO_S8 }, - { AUDIO_S16MSB, AUDIO_S16LSB, AUDIO_U16MSB, AUDIO_U16LSB, AUDIO_U8, AUDIO_S8 }, - { AUDIO_U16LSB, AUDIO_U16MSB, AUDIO_S16LSB, AUDIO_S16MSB, AUDIO_U8, AUDIO_S8 }, - { AUDIO_U16MSB, AUDIO_U16LSB, AUDIO_S16MSB, AUDIO_S16LSB, AUDIO_U8, AUDIO_S8 }, -}; - -Uint16 SDL_FirstAudioFormat(Uint16 format) -{ - for ( format_idx=0; format_idx < NUM_FORMATS; ++format_idx ) { - if ( format_list[format_idx][0] == format ) { - break; - } - } - format_idx_sub = 0; - return(SDL_NextAudioFormat()); -} - -Uint16 SDL_NextAudioFormat(void) -{ - if ( (format_idx == NUM_FORMATS) || (format_idx_sub == NUM_FORMATS) ) { - return(0); - } - return(format_list[format_idx][format_idx_sub++]); -} - -void SDL_CalculateAudioSpec(SDL_AudioSpec *spec) -{ - switch (spec->format) { - case AUDIO_U8: - spec->silence = 0x80; - break; - default: - spec->silence = 0x00; - break; - } - spec->size = (spec->format&0xFF)/8; - spec->size *= spec->channels; - spec->size *= spec->samples; -} |