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SDL_audio.c
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/*
Simple DirectMedia Layer
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Copyright (C) 1997-2017 Sam Lantinga <slouken@libsdl.org>
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This software is provided 'as-is', without any express or implied
warranty. In no event will the authors be held liable for any damages
arising from the use of this software.
Permission is granted to anyone to use this software for any purpose,
including commercial applications, and to alter it and redistribute it
freely, subject to the following restrictions:
1. The origin of this software must not be misrepresented; you must not
claim that you wrote the original software. If you use this software
in a product, an acknowledgment in the product documentation would be
appreciated but is not required.
2. Altered source versions must be plainly marked as such, and must not be
misrepresented as being the original software.
3. This notice may not be removed or altered from any source distribution.
*/
#include "../SDL_internal.h"
/* Allow access to a raw mixing buffer */
#include "SDL.h"
#include "SDL_audio.h"
#include "SDL_audio_c.h"
#include "SDL_sysaudio.h"
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#include "../thread/SDL_systhread.h"
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#define _THIS SDL_AudioDevice *_this
static SDL_AudioDriver current_audio;
static SDL_AudioDevice *open_devices[16];
/* Available audio drivers */
static const AudioBootStrap *const bootstrap[] = {
#if SDL_AUDIO_DRIVER_PULSEAUDIO
&PULSEAUDIO_bootstrap,
#endif
#if SDL_AUDIO_DRIVER_ALSA
&ALSA_bootstrap,
#endif
#if SDL_AUDIO_DRIVER_SNDIO
&SNDIO_bootstrap,
#endif
#if SDL_AUDIO_DRIVER_BSD
&BSD_AUDIO_bootstrap,
#endif
#if SDL_AUDIO_DRIVER_OSS
&DSP_bootstrap,
#endif
#if SDL_AUDIO_DRIVER_QSA
&QSAAUDIO_bootstrap,
#endif
#if SDL_AUDIO_DRIVER_SUNAUDIO
&SUNAUDIO_bootstrap,
#endif
#if SDL_AUDIO_DRIVER_ARTS
&ARTS_bootstrap,
#endif
#if SDL_AUDIO_DRIVER_ESD
&ESD_bootstrap,
#endif
#if SDL_AUDIO_DRIVER_NACL
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&NACLAUDIO_bootstrap,
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#endif
#if SDL_AUDIO_DRIVER_NAS
&NAS_bootstrap,
#endif
#if SDL_AUDIO_DRIVER_XAUDIO2
&XAUDIO2_bootstrap,
#endif
#if SDL_AUDIO_DRIVER_DSOUND
&DSOUND_bootstrap,
#endif
#if SDL_AUDIO_DRIVER_WINMM
&WINMM_bootstrap,
#endif
#if SDL_AUDIO_DRIVER_PAUDIO
&PAUDIO_bootstrap,
#endif
#if SDL_AUDIO_DRIVER_HAIKU
&HAIKUAUDIO_bootstrap,
#endif
#if SDL_AUDIO_DRIVER_COREAUDIO
&COREAUDIO_bootstrap,
#endif
#if SDL_AUDIO_DRIVER_DISK
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&DISKAUDIO_bootstrap,
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#endif
#if SDL_AUDIO_DRIVER_DUMMY
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&DUMMYAUDIO_bootstrap,
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#endif
#if SDL_AUDIO_DRIVER_FUSIONSOUND
&FUSIONSOUND_bootstrap,
#endif
#if SDL_AUDIO_DRIVER_ANDROID
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&ANDROIDAUDIO_bootstrap,
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#endif
#if SDL_AUDIO_DRIVER_PSP
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&PSPAUDIO_bootstrap,
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#endif
#if SDL_AUDIO_DRIVER_EMSCRIPTEN
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&EMSCRIPTENAUDIO_bootstrap,
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#endif
NULL
};
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#ifdef HAVE_LIBSAMPLERATE_H
#ifdef SDL_LIBSAMPLERATE_DYNAMIC
static void *SRC_lib = NULL;
#endif
SDL_bool SRC_available = SDL_FALSE;
SRC_STATE* (*SRC_src_new)(int converter_type, int channels, int *error) = NULL;
int (*SRC_src_process)(SRC_STATE *state, SRC_DATA *data) = NULL;
int (*SRC_src_reset)(SRC_STATE *state) = NULL;
SRC_STATE* (*SRC_src_delete)(SRC_STATE *state) = NULL;
const char* (*SRC_src_strerror)(int error) = NULL;
static SDL_bool
LoadLibSampleRate(void)
{
SRC_available = SDL_FALSE;
if (!SDL_GetHintBoolean("SDL_AUDIO_ALLOW_LIBRESAMPLE", SDL_TRUE)) {
return SDL_FALSE;
}
#ifdef SDL_LIBSAMPLERATE_DYNAMIC
SDL_assert(SRC_lib == NULL);
SRC_lib = SDL_LoadObject(SDL_LIBSAMPLERATE_DYNAMIC);
if (!SRC_lib) {
return SDL_FALSE;
}
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SRC_src_new = (SRC_STATE* (*)(int converter_type, int channels, int *error))SDL_LoadFunction(SRC_lib, "src_new");
SRC_src_process = (int (*)(SRC_STATE *state, SRC_DATA *data))SDL_LoadFunction(SRC_lib, "src_process");
SRC_src_reset = (int(*)(SRC_STATE *state))SDL_LoadFunction(SRC_lib, "src_reset");
SRC_src_delete = (SRC_STATE* (*)(SRC_STATE *state))SDL_LoadFunction(SRC_lib, "src_delete");
SRC_src_strerror = (const char* (*)(int error))SDL_LoadFunction(SRC_lib, "src_strerror");
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if (!SRC_src_new || !SRC_src_process || !SRC_src_reset || !SRC_src_delete || !SRC_src_strerror) {
SDL_UnloadObject(SRC_lib);
SRC_lib = NULL;
return SDL_FALSE;
}
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#else
SRC_src_new = src_new;
SRC_src_process = src_process;
SRC_src_reset = src_reset;
SRC_src_delete = src_delete;
SRC_src_strerror = src_strerror;
#endif
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SRC_available = SDL_TRUE;
return SDL_TRUE;
}
static void
UnloadLibSampleRate(void)
{
#ifdef SDL_LIBSAMPLERATE_DYNAMIC
if (SRC_lib != NULL) {
SDL_UnloadObject(SRC_lib);
}
SRC_lib = NULL;
#endif
SRC_available = SDL_FALSE;
SRC_src_new = NULL;
SRC_src_process = NULL;
SRC_src_reset = NULL;
SRC_src_delete = NULL;
SRC_src_strerror = NULL;
}
#endif
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static SDL_AudioDevice *
get_audio_device(SDL_AudioDeviceID id)
{
id--;
if ((id >= SDL_arraysize(open_devices)) || (open_devices[id] == NULL)) {
SDL_SetError("Invalid audio device ID");
return NULL;
}
return open_devices[id];
}
/* stubs for audio drivers that don't need a specific entry point... */
static void
SDL_AudioDetectDevices_Default(void)
{
/* you have to write your own implementation if these assertions fail. */
SDL_assert(current_audio.impl.OnlyHasDefaultOutputDevice);
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SDL_assert(current_audio.impl.OnlyHasDefaultCaptureDevice || !current_audio.impl.HasCaptureSupport);
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SDL_AddAudioDevice(SDL_FALSE, DEFAULT_OUTPUT_DEVNAME, (void *) ((size_t) 0x1));
if (current_audio.impl.HasCaptureSupport) {
SDL_AddAudioDevice(SDL_TRUE, DEFAULT_INPUT_DEVNAME, (void *) ((size_t) 0x2));
}
}
static void
SDL_AudioThreadInit_Default(_THIS)
{ /* no-op. */
}
static void
SDL_AudioWaitDevice_Default(_THIS)
{ /* no-op. */
}
static void
SDL_AudioPlayDevice_Default(_THIS)
{ /* no-op. */
}
static int
SDL_AudioGetPendingBytes_Default(_THIS)
{
return 0;
}
static Uint8 *
SDL_AudioGetDeviceBuf_Default(_THIS)
{
return NULL;
}
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static int
SDL_AudioCaptureFromDevice_Default(_THIS, void *buffer, int buflen)
{
return -1; /* just fail immediately. */
}
static void
SDL_AudioFlushCapture_Default(_THIS)
{ /* no-op. */
}
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static void
SDL_AudioPrepareToClose_Default(_THIS)
{ /* no-op. */
}
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static void
SDL_AudioCloseDevice_Default(_THIS)
{ /* no-op. */
}
static void
SDL_AudioDeinitialize_Default(void)
{ /* no-op. */
}
static void
SDL_AudioFreeDeviceHandle_Default(void *handle)
{ /* no-op. */
}
static int
SDL_AudioOpenDevice_Default(_THIS, void *handle, const char *devname, int iscapture)
{
return SDL_Unsupported();
}
static SDL_INLINE SDL_bool
is_in_audio_device_thread(SDL_AudioDevice * device)
{
/* The device thread locks the same mutex, but not through the public API.
This check is in case the application, in the audio callback,
tries to lock the thread that we've already locked from the
device thread...just in case we only have non-recursive mutexes. */
if (device->thread && (SDL_ThreadID() == device->threadid)) {
return SDL_TRUE;
}
return SDL_FALSE;
}
static void
SDL_AudioLockDevice_Default(SDL_AudioDevice * device)
{
if (!is_in_audio_device_thread(device)) {
SDL_LockMutex(device->mixer_lock);
}
}
static void
SDL_AudioUnlockDevice_Default(SDL_AudioDevice * device)
{
if (!is_in_audio_device_thread(device)) {
SDL_UnlockMutex(device->mixer_lock);
}
}
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static void
SDL_AudioLockOrUnlockDeviceWithNoMixerLock(SDL_AudioDevice * device)
{
}
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static void
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finish_audio_entry_points_init(void)
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{
/*
* Fill in stub functions for unused driver entry points. This lets us
* blindly call them without having to check for validity first.
*/
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if (current_audio.impl.SkipMixerLock) {
if (current_audio.impl.LockDevice == NULL) {
current_audio.impl.LockDevice = SDL_AudioLockOrUnlockDeviceWithNoMixerLock;
}
if (current_audio.impl.UnlockDevice == NULL) {
current_audio.impl.UnlockDevice = SDL_AudioLockOrUnlockDeviceWithNoMixerLock;
}
}
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#define FILL_STUB(x) \
if (current_audio.impl.x == NULL) { \
current_audio.impl.x = SDL_Audio##x##_Default; \
}
FILL_STUB(DetectDevices);
FILL_STUB(OpenDevice);
FILL_STUB(ThreadInit);
FILL_STUB(WaitDevice);
FILL_STUB(PlayDevice);
FILL_STUB(GetPendingBytes);
FILL_STUB(GetDeviceBuf);
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FILL_STUB(CaptureFromDevice);
FILL_STUB(FlushCapture);
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FILL_STUB(PrepareToClose);
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FILL_STUB(CloseDevice);
FILL_STUB(LockDevice);
FILL_STUB(UnlockDevice);
FILL_STUB(FreeDeviceHandle);
FILL_STUB(Deinitialize);
#undef FILL_STUB
}
/* device hotplug support... */
static int
add_audio_device(const char *name, void *handle, SDL_AudioDeviceItem **devices, int *devCount)
{
int retval = -1;
const size_t size = sizeof (SDL_AudioDeviceItem) + SDL_strlen(name) + 1;
SDL_AudioDeviceItem *item = (SDL_AudioDeviceItem *) SDL_malloc(size);
if (item == NULL) {
return -1;
}
SDL_assert(handle != NULL); /* we reserve NULL, audio backends can't use it. */
item->handle = handle;
SDL_strlcpy(item->name, name, size - sizeof (SDL_AudioDeviceItem));
SDL_LockMutex(current_audio.detectionLock);
item->next = *devices;
*devices = item;
retval = (*devCount)++;
SDL_UnlockMutex(current_audio.detectionLock);
return retval;
}
static SDL_INLINE int
add_capture_device(const char *name, void *handle)
{
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SDL_assert(current_audio.impl.HasCaptureSupport);
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return add_audio_device(name, handle, ¤t_audio.inputDevices, ¤t_audio.inputDeviceCount);
}
static SDL_INLINE int
add_output_device(const char *name, void *handle)
{
return add_audio_device(name, handle, ¤t_audio.outputDevices, ¤t_audio.outputDeviceCount);
}
static void
free_device_list(SDL_AudioDeviceItem **devices, int *devCount)
{
SDL_AudioDeviceItem *item, *next;
for (item = *devices; item != NULL; item = next) {
next = item->next;
if (item->handle != NULL) {
current_audio.impl.FreeDeviceHandle(item->handle);
}
SDL_free(item);
}
*devices = NULL;
*devCount = 0;
}
/* The audio backends call this when a new device is plugged in. */
void
SDL_AddAudioDevice(const int iscapture, const char *name, void *handle)
{
const int device_index = iscapture ? add_capture_device(name, handle) : add_output_device(name, handle);
if (device_index != -1) {
/* Post the event, if desired */
if (SDL_GetEventState(SDL_AUDIODEVICEADDED) == SDL_ENABLE) {
SDL_Event event;
SDL_zero(event);
event.adevice.type = SDL_AUDIODEVICEADDED;
event.adevice.which = device_index;
event.adevice.iscapture = iscapture;
SDL_PushEvent(&event);
}
}
}
/* The audio backends call this when a currently-opened device is lost. */
void SDL_OpenedAudioDeviceDisconnected(SDL_AudioDevice *device)
{
SDL_assert(get_audio_device(device->id) == device);
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if (!SDL_AtomicGet(&device->enabled)) {
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return;
}
/* Ends the audio callback and mark the device as STOPPED, but the
app still needs to close the device to free resources. */
current_audio.impl.LockDevice(device);
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SDL_AtomicSet(&device->enabled, 0);
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current_audio.impl.UnlockDevice(device);
/* Post the event, if desired */
if (SDL_GetEventState(SDL_AUDIODEVICEREMOVED) == SDL_ENABLE) {
SDL_Event event;
SDL_zero(event);
event.adevice.type = SDL_AUDIODEVICEREMOVED;
event.adevice.which = device->id;
event.adevice.iscapture = device->iscapture ? 1 : 0;
SDL_PushEvent(&event);
}
}
static void
mark_device_removed(void *handle, SDL_AudioDeviceItem *devices, SDL_bool *removedFlag)
{
SDL_AudioDeviceItem *item;
SDL_assert(handle != NULL);
for (item = devices; item != NULL; item = item->next) {
if (item->handle == handle) {
item->handle = NULL;
*removedFlag = SDL_TRUE;
return;
}
}
}
/* The audio backends call this when a device is removed from the system. */
void
SDL_RemoveAudioDevice(const int iscapture, void *handle)
{
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int device_index;
SDL_AudioDevice *device = NULL;
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SDL_LockMutex(current_audio.detectionLock);
if (iscapture) {
mark_device_removed(handle, current_audio.inputDevices, ¤t_audio.captureDevicesRemoved);
} else {
mark_device_removed(handle, current_audio.outputDevices, ¤t_audio.outputDevicesRemoved);
}
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for (device_index = 0; device_index < SDL_arraysize(open_devices); device_index++)
{
device = open_devices[device_index];
if (device != NULL && device->handle == handle)
{
SDL_OpenedAudioDeviceDisconnected(device);
break;
}
}
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SDL_UnlockMutex(current_audio.detectionLock);
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current_audio.impl.FreeDeviceHandle(handle);
}
/* buffer queueing support... */
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static void SDLCALL
SDL_BufferQueueDrainCallback(void *userdata, Uint8 *stream, int len)
{
/* this function always holds the mixer lock before being called. */
SDL_AudioDevice *device = (SDL_AudioDevice *) userdata;
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size_t dequeued;
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SDL_assert(device != NULL); /* this shouldn't ever happen, right?! */
SDL_assert(!device->iscapture); /* this shouldn't ever happen, right?! */
SDL_assert(len >= 0); /* this shouldn't ever happen, right?! */
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dequeued = SDL_ReadFromDataQueue(device->buffer_queue, stream, len);
stream += dequeued;
len -= (int) dequeued;
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if (len > 0) { /* fill any remaining space in the stream with silence. */
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SDL_assert(SDL_CountDataQueue(device->buffer_queue) == 0);
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SDL_memset(stream, device->spec.silence, len);
}
}
static void SDLCALL
SDL_BufferQueueFillCallback(void *userdata, Uint8 *stream, int len)
{
/* this function always holds the mixer lock before being called. */
SDL_AudioDevice *device = (SDL_AudioDevice *) userdata;
SDL_assert(device != NULL); /* this shouldn't ever happen, right?! */
SDL_assert(device->iscapture); /* this shouldn't ever happen, right?! */
SDL_assert(len >= 0); /* this shouldn't ever happen, right?! */
/* note that if this needs to allocate more space and run out of memory,
we have no choice but to quietly drop the data and hope it works out
later, but you probably have bigger problems in this case anyhow. */
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SDL_WriteToDataQueue(device->buffer_queue, stream, len);
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}
int
SDL_QueueAudio(SDL_AudioDeviceID devid, const void *data, Uint32 len)
{
SDL_AudioDevice *device = get_audio_device(devid);
int rc = 0;
if (!device) {
return -1; /* get_audio_device() will have set the error state */
} else if (device->iscapture) {
return SDL_SetError("This is a capture device, queueing not allowed");
} else if (device->spec.callback != SDL_BufferQueueDrainCallback) {
return SDL_SetError("Audio device has a callback, queueing not allowed");
}
if (len > 0) {
current_audio.impl.LockDevice(device);
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rc = SDL_WriteToDataQueue(device->buffer_queue, data, len);
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current_audio.impl.UnlockDevice(device);
}
return rc;
}
Uint32
SDL_DequeueAudio(SDL_AudioDeviceID devid, void *data, Uint32 len)
{
SDL_AudioDevice *device = get_audio_device(devid);
Uint32 rc;
if ( (len == 0) || /* nothing to do? */
(!device) || /* called with bogus device id */
(!device->iscapture) || /* playback devices can't dequeue */
(device->spec.callback != SDL_BufferQueueFillCallback) ) { /* not set for queueing */
return 0; /* just report zero bytes dequeued. */
}
current_audio.impl.LockDevice(device);
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rc = (Uint32) SDL_ReadFromDataQueue(device->buffer_queue, data, len);
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current_audio.impl.UnlockDevice(device);
return rc;
}
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Uint32
SDL_GetQueuedAudioSize(SDL_AudioDeviceID devid)
{
Uint32 retval = 0;
SDL_AudioDevice *device = get_audio_device(devid);
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if (!device) {
return 0;
}
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/* Nothing to do unless we're set up for queueing. */
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if (device->spec.callback == SDL_BufferQueueDrainCallback) {
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current_audio.impl.LockDevice(device);
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retval = ((Uint32) SDL_CountDataQueue(device->buffer_queue)) + current_audio.impl.GetPendingBytes(device);
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current_audio.impl.UnlockDevice(device);
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} else if (device->spec.callback == SDL_BufferQueueFillCallback) {
current_audio.impl.LockDevice(device);
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retval = (Uint32) SDL_CountDataQueue(device->buffer_queue);
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current_audio.impl.UnlockDevice(device);
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}
return retval;
}
void
SDL_ClearQueuedAudio(SDL_AudioDeviceID devid)
{
SDL_AudioDevice *device = get_audio_device(devid);
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if (!device) {
return; /* nothing to do. */
}
/* Blank out the device and release the mutex. Free it afterwards. */
current_audio.impl.LockDevice(device);
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/* Keep up to two packets in the pool to reduce future malloc pressure. */
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SDL_ClearDataQueue(device->buffer_queue, SDL_AUDIOBUFFERQUEUE_PACKETLEN * 2);
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current_audio.impl.UnlockDevice(device);
}
/* The general mixing thread function */
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static int SDLCALL
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SDL_RunAudio(void *devicep)
{
SDL_AudioDevice *device = (SDL_AudioDevice *) devicep;
const int silence = (int) device->spec.silence;
const Uint32 delay = ((device->spec.samples * 1000) / device->spec.freq);
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const int data_len = device->callbackspec.size;
Uint8 *data;
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void *udata = device->spec.userdata;
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SDL_AudioCallback callback = device->spec.callback;
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SDL_assert(!device->iscapture);
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/* The audio mixing is always a high priority thread */
SDL_SetThreadPriority(SDL_THREAD_PRIORITY_HIGH);
/* Perform any thread setup */
device->threadid = SDL_ThreadID();
current_audio.impl.ThreadInit(device);
/* Loop, filling the audio buffers */
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while (!SDL_AtomicGet(&device->shutdown)) {
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/* Fill the current buffer with sound */
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if (!device->stream && SDL_AtomicGet(&device->enabled)) {
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SDL_assert(data_len == device->spec.size);
data = current_audio.impl.GetDeviceBuf(device);
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} else {
/* if the device isn't enabled, we still write to the
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work_buffer, so the app's callback will fire with
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a regular frequency, in case they depend on that
for timing or progress. They can use hotplug
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now to know if the device failed.
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Streaming playback uses work_buffer, too. */
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data = NULL;
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}
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if (data == NULL) {
data = device->work_buffer;
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}
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if ( SDL_AtomicGet(&device->enabled) ) {
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/* !!! FIXME: this should be LockDevice. */
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SDL_LockMutex(device->mixer_lock);
if (SDL_AtomicGet(&device->paused)) {
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SDL_memset(data, silence, data_len);
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} else {
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callback(udata, data, data_len);
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}
SDL_UnlockMutex(device->mixer_lock);
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} else {
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SDL_memset(data, silence, data_len);
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}
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if (device->stream) {
/* Stream available audio to device, converting/resampling. */
/* if this fails...oh well. We'll play silence here. */
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SDL_AudioStreamPut(device->stream, data, data_len);
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while (SDL_AudioStreamAvailable(device->stream) >= ((int) device->spec.size)) {
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data = SDL_AtomicGet(&device->enabled) ? current_audio.impl.GetDeviceBuf(device) : NULL;
if (data == NULL) {
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SDL_AudioStreamClear(device->stream);
SDL_Delay(delay);
break;
} else {
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const int got = SDL_AudioStreamGet(device->stream, data, device->spec.size);
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SDL_assert((got < 0) || (got == device->spec.size));
if (got != device->spec.size) {
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SDL_memset(data, device->spec.silence, device->spec.size);
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}
current_audio.impl.PlayDevice(device);
current_audio.impl.WaitDevice(device);
}
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}
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} else if (data == device->work_buffer) {
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/* nothing to do; pause like we queued a buffer to play. */
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SDL_Delay(delay);
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} else { /* writing directly to the device. */
/* queue this buffer and wait for it to finish playing. */
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current_audio.impl.PlayDevice(device);
current_audio.impl.WaitDevice(device);
}
}
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current_audio.impl.PrepareToClose(device);
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/* Wait for the audio to drain. */
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SDL_Delay(((device->spec.samples * 1000) / device->spec.freq) * 2);
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return 0;
}
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/* The general capture thread function */
static int SDLCALL
SDL_CaptureAudio(void *devicep)
{
SDL_AudioDevice *device = (SDL_AudioDevice *) devicep;
const int silence = (int) device->spec.silence;
const Uint32 delay = ((device->spec.samples * 1000) / device->spec.freq);
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const int data_len = device->spec.size;
Uint8 *data;
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void *udata = device->spec.userdata;
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SDL_AudioCallback callback = device->spec.callback;
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SDL_assert(device->iscapture);
/* The audio mixing is always a high priority thread */
SDL_SetThreadPriority(SDL_THREAD_PRIORITY_HIGH);
/* Perform any thread setup */
device->threadid = SDL_ThreadID();
current_audio.impl.ThreadInit(device);
/* Loop, filling the audio buffers */
while (!SDL_AtomicGet(&device->shutdown)) {
int still_need;
Uint8 *ptr;
if (!SDL_AtomicGet(&device->enabled) || SDL_AtomicGet(&device->paused)) {
SDL_Delay(delay); /* just so we don't cook the CPU. */
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if (device->stream) {
SDL_AudioStreamClear(device->stream);
}
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current_audio.impl.FlushCapture(device); /* dump anything pending. */
continue;
}
/* Fill the current buffer with sound */
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still_need = data_len;
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/* Use the work_buffer to hold data read from the device. */
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data = device->work_buffer;
SDL_assert(data != NULL);
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ptr = data;
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/* We still read from the device when "paused" to keep the state sane,
and block when there isn't data so this thread isn't eating CPU.
But we don't process it further or call the app's callback. */
while (still_need > 0) {
const int rc = current_audio.impl.CaptureFromDevice(device, ptr, still_need);
SDL_assert(rc <= still_need); /* device should not overflow buffer. :) */
if (rc > 0) {
still_need -= rc;
ptr += rc;
} else { /* uhoh, device failed for some reason! */
SDL_OpenedAudioDeviceDisconnected(device);
break;
}
}
if (still_need > 0) {
/* Keep any data we already read, silence the rest. */
SDL_memset(ptr, silence, still_need);
}
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if (device->stream) {
/* if this fails...oh well. */
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SDL_AudioStreamPut(device->stream, data, data_len);
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while (SDL_AudioStreamAvailable(device->stream) >= ((int) device->callbackspec.size)) {
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const int got = SDL_AudioStreamGet(device->stream, device->work_buffer, device->callbackspec.size);
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SDL_assert((got < 0) || (got == device->callbackspec.size));
if (got != device->callbackspec.size) {
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SDL_memset(device->work_buffer, device->spec.silence, device->callbackspec.size);
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}
/* !!! FIXME: this should be LockDevice. */
SDL_LockMutex(device->mixer_lock);
if (!SDL_AtomicGet(&device->paused)) {
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callback(udata, device->work_buffer, device->callbackspec.size);
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}
SDL_UnlockMutex(device->mixer_lock);
}
} else { /* feeding user callback directly without streaming. */
/* !!! FIXME: this should be LockDevice. */
SDL_LockMutex(device->mixer_lock);
if (!SDL_AtomicGet(&device->paused)) {
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callback(udata, data, device->callbackspec.size);
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}
SDL_UnlockMutex(device->mixer_lock);
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}
}
current_audio.impl.FlushCapture(device);
return 0;
}
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static SDL_AudioFormat
SDL_ParseAudioFormat(const char *string)
{
#define CHECK_FMT_STRING(x) if (SDL_strcmp(string, #x) == 0) return AUDIO_##x
CHECK_FMT_STRING(U8);
CHECK_FMT_STRING(S8);
CHECK_FMT_STRING(U16LSB);
CHECK_FMT_STRING(S16LSB);
CHECK_FMT_STRING(U16MSB);
CHECK_FMT_STRING(S16MSB);
CHECK_FMT_STRING(U16SYS);
CHECK_FMT_STRING(S16SYS);
CHECK_FMT_STRING(U16);
CHECK_FMT_STRING(S16);
CHECK_FMT_STRING(S32LSB);
CHECK_FMT_STRING(S32MSB);
CHECK_FMT_STRING(S32SYS);
CHECK_FMT_STRING(S32);
CHECK_FMT_STRING(F32LSB);
CHECK_FMT_STRING(F32MSB);
CHECK_FMT_STRING(F32SYS);
CHECK_FMT_STRING(F32);
#undef CHECK_FMT_STRING
return 0;
}
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;
}
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extern void SDL_ChooseAudioConverters(void);
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int
SDL_AudioInit(const char *driver_name)
{
int i = 0;
int initialized = 0;
int tried_to_init = 0;
if (SDL_WasInit(SDL_INIT_AUDIO)) {
SDL_AudioQuit(); /* shutdown driver if already running. */
}
SDL_zero(current_audio);
SDL_zero(open_devices);
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SDL_ChooseAudioConverters();
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/* Select the proper audio driver */
if (driver_name == NULL) {
driver_name = SDL_getenv("SDL_AUDIODRIVER");
}
for (i = 0; (!initialized) && (bootstrap[i]); ++i) {
/* make sure we should even try this driver before doing so... */
const AudioBootStrap *backend = bootstrap[i];
if ((driver_name && (SDL_strncasecmp(backend->name, driver_name, SDL_strlen(driver_name)) != 0)) ||
(!driver_name && backend->demand_only)) {
continue;
}
tried_to_init = 1;
SDL_zero(current_audio);
current_audio.name = backend->name;
current_audio.desc = backend->desc;
initialized = backend->init(¤t_audio.impl);
}
if (!initialized) {
/* specific drivers will set the error message if they fail... */
if (!tried_to_init) {
if (driver_name) {
SDL_SetError("Audio target '%s' not available", driver_name);
} else {
SDL_SetError("No available audio device");
}
}
SDL_zero(current_audio);
return -1; /* No driver was available, so fail. */
}
current_audio.detectionLock = SDL_CreateMutex();
900
finish_audio_entry_points_init();
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/* Make sure we have a list of devices available at startup. */
current_audio.impl.DetectDevices();
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#ifdef HAVE_LIBSAMPLERATE_H
LoadLibSampleRate();
#endif
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return 0;
}
/*
* Get the current audio driver name
*/
const char *
SDL_GetCurrentAudioDriver()
{
return current_audio.name;
}
/* Clean out devices that we've removed but had to keep around for stability. */
static void
clean_out_device_list(SDL_AudioDeviceItem **devices, int *devCount, SDL_bool *removedFlag)
{
SDL_AudioDeviceItem *item = *devices;
SDL_AudioDeviceItem *prev = NULL;
int total = 0;
while (item) {
SDL_AudioDeviceItem *next = item->next;
if (item->handle != NULL) {
total++;
prev = item;
} else {
if (prev) {
prev->next = next;
} else {
*devices = next;
}
SDL_free(item);
}
item = next;
}
*devCount = total;
*removedFlag = SDL_FALSE;
}
int
SDL_GetNumAudioDevices(int iscapture)
{
int retval = 0;
if (!SDL_WasInit(SDL_INIT_AUDIO)) {
return -1;
}
SDL_LockMutex(current_audio.detectionLock);
if (iscapture && current_audio.captureDevicesRemoved) {
clean_out_device_list(¤t_audio.inputDevices, ¤t_audio.inputDeviceCount, ¤t_audio.captureDevicesRemoved);
}
if (!iscapture && current_audio.outputDevicesRemoved) {
clean_out_device_list(¤t_audio.outputDevices, ¤t_audio.outputDeviceCount, ¤t_audio.outputDevicesRemoved);
current_audio.outputDevicesRemoved = SDL_FALSE;
}
retval = iscapture ? current_audio.inputDeviceCount : current_audio.outputDeviceCount;
SDL_UnlockMutex(current_audio.detectionLock);
return retval;
}
const char *
SDL_GetAudioDeviceName(int index, int iscapture)
{
const char *retval = NULL;
if (!SDL_WasInit(SDL_INIT_AUDIO)) {
SDL_SetError("Audio subsystem is not initialized");
return NULL;
}
if ((iscapture) && (!current_audio.impl.HasCaptureSupport)) {
SDL_SetError("No capture support");
return NULL;
}
if (index >= 0) {
SDL_AudioDeviceItem *item;
int i;
SDL_LockMutex(current_audio.detectionLock);
item = iscapture ? current_audio.inputDevices : current_audio.outputDevices;
i = iscapture ? current_audio.inputDeviceCount : current_audio.outputDeviceCount;
if (index < i) {
for (i--; i > index; i--, item = item->next) {
SDL_assert(item != NULL);