pandory500/SDL-mirror
2
0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions
SDL-mirror/src/audio/SDL_audio.c
Sam Lantinga 9cbad57c92 Removed libc dependency on Windows again, to fix building with Visual C++ 2005 Express Edition. 
Fixed performance problem with testsprite2 on the D3D driver.

--HG--
extra : convert_revision : svn%3Ac70aab31-4412-0410-b14c-859654838e24/trunk%401946
2006-07-13 08:13:02 +00:00

803 lines
20 KiB
C
Raw Blame History

/*
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_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_AHI
&AHI_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_MMEAUDIO
&MMEAUDIO_bootstrap,
#endif
#if SDL_AUDIO_DRIVER_DART
&DART_bootstrap,
#endif
NULL
};
SDL_AudioDevice *current_audio = NULL;
/* Various local functions */
int SDL_AudioInit(const char *driver_name);
void SDL_AudioQuit(void);
#if SDL_AUDIO_DRIVER_AHI
static int audio_configured = 0;
#endif
/* 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;
#if SDL_AUDIO_DRIVER_AHI
int started = 0;
/* AmigaOS NEEDS that the audio driver is opened in the thread that uses it! */
D(bug("Task audio started audio struct:<%lx>...\n", audiop));
D(bug("Before Openaudio..."));
if (audio->OpenAudio(audio, &audio->spec) == -1) {
D(bug("Open audio failed...\n"));
return (-1);
}
D(bug("OpenAudio...OK\n"));
#endif
/* 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 SDL_AUDIO_DRIVER_AHI
audio_configured = 1;
D(bug("Audio configured... Checking for conversion\n"));
SDL_mutexP(audio->mixer_lock);
D(bug("Semaphore obtained...\n"));
#endif
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;
}
#if SDL_AUDIO_DRIVER_AHI
SDL_mutexV(audio->mixer_lock);
D(bug("Entering audio loop...\n"));
#endif
#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);
}
#if SDL_AUDIO_DRIVER_AHI
D(bug("WaitAudio...Done\n"));
audio->CloseAudio(audio);
D(bug("CloseAudio..Done, subtask exiting...\n"));
audio_configured = 0;
#endif
#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_GetNumAudioDrivers(void)
{
return (SDL_arraysize(bootstrap) - 1);
}
const char *
SDL_GetAudioDriver(int index)
{
if (index >= 0 && index < SDL_GetNumAudioDrivers()) {
return (bootstrap[index]->name);
}
return (NULL);
}
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_strcmp(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_strncmp(bootstrap[i]->name, driver_name,
SDL_strlen(bootstrap[i]->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) {
if (driver_name) {
SDL_SetError("%s not available", driver_name);
} else {
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);
}
/*
* Get the current audio driver name
*/
const char *
SDL_GetCurrentAudioDriver()
{
if (current_audio) {
return current_audio->name;
}
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 defined(__MACOS__) || (defined(__RISCOS__) && SDL_THREADS_DISABLED)
/* FIXME: Need to implement PPC interrupt asm for SDL_LockAudio() */
#else
#if defined(__MINT__) && 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 /* __MINT__ */
#endif /* __MACOS__ */
/* 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;
#if !SDL_AUDIO_DRIVER_AHI
/* AmigaOS opens audio inside the main loop */
audio->opened = audio->OpenAudio(audio, &audio->spec) + 1;
if (!audio->opened) {
SDL_CloseAudio();
return (-1);
}
#else
D(bug("Locking semaphore..."));
SDL_mutexP(audio->mixer_lock);
audio->thread = SDL_CreateThread(SDL_RunAudio, audio);
D(bug("Created thread...\n"));
if (audio->thread == NULL) {
SDL_mutexV(audio->mixer_lock);
SDL_CloseAudio();
SDL_SetError("Couldn't create audio thread");
return (-1);
}
while (!audio_configured)
SDL_Delay(100);
#endif
/* 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 = desired->size;
audio->convert.buf =
(Uint8 *) SDL_AllocAudioMem(audio->convert.len *
audio->convert.len_mult);
if (audio->convert.buf == NULL) {
SDL_CloseAudio();
SDL_OutOfMemory();
return (-1);
}
}
}
#if !SDL_AUDIO_DRIVER_AHI
/* Start the audio thread if necessary */
switch (audio->opened) {
case 1:
/* Start the audio thread */
#if (defined(__WIN32__) && !defined(_WIN32_WCE)) && !defined(HAVE_LIBC)
#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;
}
#else
SDL_mutexV(audio->mixer_lock);
D(bug("SDL_OpenAudio USCITA...\n"));
#endif
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 !SDL_AUDIO_DRIVER_AHI
if (audio->opened) {
audio->CloseAudio(audio);
audio->opened = 0;
}
#endif
/* 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;
}
/* vi: set ts=4 sw=4 expandtab: */
Reference in a new issue View git blame Copy permalink