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SDL_audio.c
1211 lines (1053 loc) · 34.7 KB
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/*
SDL - Simple DirectMedia Layer
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Copyright (C) 1997-2011 Sam Lantinga
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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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
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Lesser General Public License for more details.
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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
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Sam Lantinga
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slouken@libsdl.org
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*/
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#include "SDL_config.h"
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/* Allow access to a raw mixing buffer */
#include "SDL.h"
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#include "SDL_audio.h"
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#include "SDL_audio_c.h"
#include "SDL_audiomem.h"
#include "SDL_sysaudio.h"
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#define _THIS SDL_AudioDevice *_this
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static SDL_AudioDriver current_audio;
static SDL_AudioDevice *open_devices[16];
/* !!! FIXME: These are wordy and unlocalized... */
#define DEFAULT_OUTPUT_DEVNAME "System audio output device"
#define DEFAULT_INPUT_DEVNAME "System audio capture device"
/*
* Not all of these will be compiled and linked in, but it's convenient
* to have a complete list here and saves yet-another block of #ifdefs...
* Please see bootstrap[], below, for the actual #ifdef mess.
*/
extern AudioBootStrap BSD_AUDIO_bootstrap;
extern AudioBootStrap DSP_bootstrap;
extern AudioBootStrap DMA_bootstrap;
extern AudioBootStrap ALSA_bootstrap;
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extern AudioBootStrap PULSEAUDIO_bootstrap;
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extern AudioBootStrap QSAAUDIO_bootstrap;
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extern AudioBootStrap SUNAUDIO_bootstrap;
extern AudioBootStrap ARTS_bootstrap;
extern AudioBootStrap ESD_bootstrap;
extern AudioBootStrap NAS_bootstrap;
extern AudioBootStrap DSOUND_bootstrap;
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extern AudioBootStrap WINWAVEOUT_bootstrap;
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extern AudioBootStrap PAUDIO_bootstrap;
extern AudioBootStrap BEOSAUDIO_bootstrap;
extern AudioBootStrap COREAUDIO_bootstrap;
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extern AudioBootStrap COREAUDIOIPHONE_bootstrap;
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extern AudioBootStrap SNDMGR_bootstrap;
extern AudioBootStrap DISKAUD_bootstrap;
extern AudioBootStrap DUMMYAUD_bootstrap;
extern AudioBootStrap DCAUD_bootstrap;
extern AudioBootStrap DART_bootstrap;
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extern AudioBootStrap NDSAUD_bootstrap;
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extern AudioBootStrap FUSIONSOUND_bootstrap;
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extern AudioBootStrap ANDROIDAUD_bootstrap;
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/* Available audio drivers */
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static const AudioBootStrap *const bootstrap[] = {
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#if SDL_AUDIO_DRIVER_PULSEAUDIO
&PULSEAUDIO_bootstrap,
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#endif
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#if SDL_AUDIO_DRIVER_ALSA
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&ALSA_bootstrap,
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#endif
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#if SDL_AUDIO_DRIVER_BSD
&BSD_AUDIO_bootstrap,
#endif
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#if SDL_AUDIO_DRIVER_OSS
&DSP_bootstrap,
&DMA_bootstrap,
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#endif
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#if SDL_AUDIO_DRIVER_QSA
&QSAAUDIO_bootstrap,
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#endif
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#if SDL_AUDIO_DRIVER_SUNAUDIO
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&SUNAUDIO_bootstrap,
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#endif
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#if SDL_AUDIO_DRIVER_ARTS
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&ARTS_bootstrap,
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#endif
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#if SDL_AUDIO_DRIVER_ESD
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&ESD_bootstrap,
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#endif
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#if SDL_AUDIO_DRIVER_NAS
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&NAS_bootstrap,
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#endif
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#if SDL_AUDIO_DRIVER_DSOUND
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&DSOUND_bootstrap,
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#endif
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#if SDL_AUDIO_DRIVER_WINWAVEOUT
&WINWAVEOUT_bootstrap,
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#endif
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#if SDL_AUDIO_DRIVER_PAUDIO
&PAUDIO_bootstrap,
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#endif
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#if SDL_AUDIO_DRIVER_BEOSAUDIO
&BEOSAUDIO_bootstrap,
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#endif
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#if SDL_AUDIO_DRIVER_COREAUDIO
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&COREAUDIO_bootstrap,
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#endif
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#if SDL_AUDIO_DRIVER_COREAUDIOIPHONE
&COREAUDIOIPHONE_bootstrap,
#endif
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#if SDL_AUDIO_DRIVER_DISK
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&DISKAUD_bootstrap,
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#endif
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#if SDL_AUDIO_DRIVER_DUMMY
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&DUMMYAUD_bootstrap,
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#endif
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#if SDL_AUDIO_DRIVER_NDS
&NDSAUD_bootstrap,
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#endif
#if SDL_AUDIO_DRIVER_FUSIONSOUND
&FUSIONSOUND_bootstrap,
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#endif
#if SDL_AUDIO_DRIVER_ANDROID
&ANDROIDAUD_bootstrap,
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#endif
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NULL
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};
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static SDL_AudioDevice *
get_audio_device(SDL_AudioDeviceID id)
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{
id--;
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if ((id >= SDL_arraysize(open_devices)) || (open_devices[id] == NULL)) {
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SDL_SetError("Invalid audio device ID");
return NULL;
}
return open_devices[id];
}
/* stubs for audio drivers that don't need a specific entry point... */
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static int
SDL_AudioDetectDevices_Default(int iscapture)
{
return -1;
}
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static void
SDL_AudioThreadInit_Default(_THIS)
{ /* no-op. */
}
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static void
SDL_AudioWaitDevice_Default(_THIS)
{ /* no-op. */
}
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static void
SDL_AudioPlayDevice_Default(_THIS)
{ /* no-op. */
}
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static Uint8 *
SDL_AudioGetDeviceBuf_Default(_THIS)
{
return NULL;
}
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static void
SDL_AudioWaitDone_Default(_THIS)
{ /* no-op. */
}
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static void
SDL_AudioCloseDevice_Default(_THIS)
{ /* no-op. */
}
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static void
SDL_AudioDeinitialize_Default(void)
{ /* no-op. */
}
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static int
SDL_AudioOpenDevice_Default(_THIS, const char *devname, int iscapture)
{
return 0;
}
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static const char *
SDL_AudioGetDeviceName_Default(int index, int iscapture)
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{
SDL_SetError("No such device");
return NULL;
}
static void
SDL_AudioLockDevice_Default(SDL_AudioDevice * device)
{
if (device->thread && (SDL_ThreadID() == device->threadid)) {
return;
}
SDL_mutexP(device->mixer_lock);
}
static void
SDL_AudioUnlockDevice_Default(SDL_AudioDevice * device)
{
if (device->thread && (SDL_ThreadID() == device->threadid)) {
return;
}
SDL_mutexV(device->mixer_lock);
}
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static void
finalize_audio_entry_points(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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#define FILL_STUB(x) \
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if (current_audio.impl.x == NULL) { \
current_audio.impl.x = SDL_Audio##x##_Default; \
}
FILL_STUB(DetectDevices);
FILL_STUB(GetDeviceName);
FILL_STUB(OpenDevice);
FILL_STUB(ThreadInit);
FILL_STUB(WaitDevice);
FILL_STUB(PlayDevice);
FILL_STUB(GetDeviceBuf);
FILL_STUB(WaitDone);
FILL_STUB(CloseDevice);
FILL_STUB(LockDevice);
FILL_STUB(UnlockDevice);
FILL_STUB(Deinitialize);
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#undef FILL_STUB
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}
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/* Streaming functions (for when the input and output buffer sizes are different) */
/* Write [length] bytes from buf into the streamer */
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static void
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SDL_StreamWrite(SDL_AudioStreamer * stream, Uint8 * buf, int length)
{
int i;
for (i = 0; i < length; ++i) {
stream->buffer[stream->write_pos] = buf[i];
++stream->write_pos;
}
}
/* Read [length] bytes out of the streamer into buf */
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static void
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SDL_StreamRead(SDL_AudioStreamer * stream, Uint8 * buf, int length)
{
int i;
for (i = 0; i < length; ++i) {
buf[i] = stream->buffer[stream->read_pos];
++stream->read_pos;
}
}
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static int
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SDL_StreamLength(SDL_AudioStreamer * stream)
{
return (stream->write_pos - stream->read_pos) % stream->max_len;
}
/* Initialize the stream by allocating the buffer and setting the read/write heads to the beginning */
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#if 0
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static int
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SDL_StreamInit(SDL_AudioStreamer * stream, int max_len, Uint8 silence)
{
/* First try to allocate the buffer */
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stream->buffer = (Uint8 *) SDL_malloc(max_len);
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if (stream->buffer == NULL) {
return -1;
}
stream->max_len = max_len;
stream->read_pos = 0;
stream->write_pos = 0;
/* Zero out the buffer */
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SDL_memset(stream->buffer, silence, max_len);
return 0;
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}
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#endif
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/* Deinitialize the stream simply by freeing the buffer */
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static void
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SDL_StreamDeinit(SDL_AudioStreamer * stream)
{
if (stream->buffer != NULL) {
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SDL_free(stream->buffer);
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}
}
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#if defined(ANDROID)
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#include <android/log.h>
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#endif
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/* The general mixing thread function */
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int SDLCALL
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SDL_RunAudio(void *devicep)
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{
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SDL_AudioDevice *device = (SDL_AudioDevice *) devicep;
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Uint8 *stream;
int stream_len;
void *udata;
void (SDLCALL * fill) (void *userdata, Uint8 * stream, int len);
int silence;
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Uint32 delay;
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/* For streaming when the buffer sizes don't match up */
Uint8 *istream;
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int istream_len = 0;
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/* The audio mixing is always a high priority thread */
SDL_SetThreadPriority(SDL_THREAD_PRIORITY_HIGH);
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/* Perform any thread setup */
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device->threadid = SDL_ThreadID();
current_audio.impl.ThreadInit(device);
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/* Set up the mixing function */
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fill = device->spec.callback;
udata = device->spec.userdata;
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/* By default do not stream */
device->use_streamer = 0;
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if (device->convert.needed) {
if (device->convert.src_format == AUDIO_U8) {
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silence = 0x80;
} else {
silence = 0;
}
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#if 0 /* !!! FIXME: I took len_div out of the structure. Use rate_incr instead? */
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/* If the result of the conversion alters the length, i.e. resampling is being used, use the streamer */
if (device->convert.len_mult != 1 || device->convert.len_div != 1) {
/* The streamer's maximum length should be twice whichever is larger: spec.size or len_cvt */
stream_max_len = 2 * device->spec.size;
if (device->convert.len_mult > device->convert.len_div) {
stream_max_len *= device->convert.len_mult;
stream_max_len /= device->convert.len_div;
}
if (SDL_StreamInit(&device->streamer, stream_max_len, silence) <
0)
return -1;
device->use_streamer = 1;
/* istream_len should be the length of what we grab from the callback and feed to conversion,
so that we get close to spec_size. I.e. we want device.spec_size = istream_len * u / d
*/
istream_len =
device->spec.size * device->convert.len_div /
device->convert.len_mult;
}
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#endif
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/* stream_len = device->convert.len; */
stream_len = device->spec.size;
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} else {
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silence = device->spec.silence;
stream_len = device->spec.size;
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}
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/* Calculate the delay while paused */
delay = ((device->spec.samples * 1000) / device->spec.freq);
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/* Determine if the streamer is necessary here */
if (device->use_streamer == 1) {
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/* This code is almost the same as the old code. The difference is, instead of reading
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directly from the callback into "stream", then converting and sending the audio off,
we go: callback -> "istream" -> (conversion) -> streamer -> stream -> device.
However, reading and writing with streamer are done separately:
- We only call the callback and write to the streamer when the streamer does not
contain enough samples to output to the device.
- We only read from the streamer and tell the device to play when the streamer
does have enough samples to output.
This allows us to perform resampling in the conversion step, where the output of the
resampling process can be any number. We will have to see what a good size for the
stream's maximum length is, but I suspect 2*max(len_cvt, stream_len) is a good figure.
*/
while (device->enabled) {
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if (device->paused) {
SDL_Delay(delay);
continue;
}
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/* Only read in audio if the streamer doesn't have enough already (if it does not have enough samples to output) */
if (SDL_StreamLength(&device->streamer) < stream_len) {
/* Set up istream */
if (device->convert.needed) {
if (device->convert.buf) {
istream = device->convert.buf;
} else {
continue;
}
} else {
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/* FIXME: Ryan, this is probably wrong. I imagine we don't want to get
* a device buffer both here and below in the stream output.
*/
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istream = current_audio.impl.GetDeviceBuf(device);
if (istream == NULL) {
istream = device->fake_stream;
}
}
/* Read from the callback into the _input_ stream */
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SDL_mutexP(device->mixer_lock);
(*fill) (udata, istream, istream_len);
SDL_mutexV(device->mixer_lock);
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/* Convert the audio if necessary and write to the streamer */
if (device->convert.needed) {
SDL_ConvertAudio(&device->convert);
if (istream == NULL) {
istream = device->fake_stream;
}
/*SDL_memcpy(istream, device->convert.buf, device->convert.len_cvt); */
SDL_StreamWrite(&device->streamer, device->convert.buf,
device->convert.len_cvt);
} else {
SDL_StreamWrite(&device->streamer, istream, istream_len);
}
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}
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/* Only output audio if the streamer has enough to output */
if (SDL_StreamLength(&device->streamer) >= stream_len) {
/* Set up the output stream */
if (device->convert.needed) {
if (device->convert.buf) {
stream = device->convert.buf;
} else {
continue;
}
} else {
stream = current_audio.impl.GetDeviceBuf(device);
if (stream == NULL) {
stream = device->fake_stream;
}
}
/* Now read from the streamer */
SDL_StreamRead(&device->streamer, stream, stream_len);
/* Ready current buffer for play and change current buffer */
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if (stream != device->fake_stream) {
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current_audio.impl.PlayDevice(device);
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/* Wait for an audio buffer to become available */
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current_audio.impl.WaitDevice(device);
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} else {
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SDL_Delay(delay);
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}
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}
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}
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} else {
/* Otherwise, do not use the streamer. This is the old code. */
/* Loop, filling the audio buffers */
while (device->enabled) {
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if (device->paused) {
SDL_Delay(delay);
continue;
}
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/* Fill the current buffer with sound */
if (device->convert.needed) {
if (device->convert.buf) {
stream = device->convert.buf;
} else {
continue;
}
} else {
stream = current_audio.impl.GetDeviceBuf(device);
if (stream == NULL) {
stream = device->fake_stream;
}
}
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SDL_mutexP(device->mixer_lock);
(*fill) (udata, stream, stream_len);
SDL_mutexV(device->mixer_lock);
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/* Convert the audio if necessary */
if (device->convert.needed) {
SDL_ConvertAudio(&device->convert);
stream = current_audio.impl.GetDeviceBuf(device);
if (stream == NULL) {
stream = device->fake_stream;
}
SDL_memcpy(stream, device->convert.buf,
device->convert.len_cvt);
}
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/* Ready current buffer for play and change current buffer */
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if (stream != device->fake_stream) {
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current_audio.impl.PlayDevice(device);
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/* Wait for an audio buffer to become available */
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current_audio.impl.WaitDevice(device);
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} else {
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SDL_Delay(delay);
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}
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}
}
/* Wait for the audio to drain.. */
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current_audio.impl.WaitDone(device);
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/* If necessary, deinit the streamer */
if (device->use_streamer == 1)
SDL_StreamDeinit(&device->streamer);
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return (0);
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}
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static SDL_AudioFormat
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SDL_ParseAudioFormat(const char *string)
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{
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#define CHECK_FMT_STRING(x) if (SDL_strcmp(string, #x) == 0) return AUDIO_##x
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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);
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#undef CHECK_FMT_STRING
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return 0;
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}
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int
SDL_GetNumAudioDrivers(void)
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{
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return (SDL_arraysize(bootstrap) - 1);
}
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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)
{
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int i = 0;
int initialized = 0;
int tried_to_init = 0;
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if (SDL_WasInit(SDL_INIT_AUDIO)) {
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SDL_AudioQuit(); /* shutdown driver if already running. */
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}
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SDL_memset(¤t_audio, '\0', sizeof(current_audio));
SDL_memset(open_devices, '\0', sizeof(open_devices));
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/* Select the proper audio driver */
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if (driver_name == NULL) {
driver_name = SDL_getenv("SDL_AUDIODRIVER");
}
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for (i = 0; (!initialized) && (bootstrap[i]); ++i) {
/* make sure we should even try this driver before doing so... */
const AudioBootStrap *backend = bootstrap[i];
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if (((driver_name) && (SDL_strcasecmp(backend->name, driver_name))) ||
((!driver_name) && (backend->demand_only))) {
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continue;
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}
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tried_to_init = 1;
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SDL_memset(¤t_audio, 0, sizeof(current_audio));
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current_audio.name = backend->name;
current_audio.desc = backend->desc;
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initialized = backend->init(¤t_audio.impl);
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}
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if (!initialized) {
/* specific drivers will set the error message if they fail... */
if (!tried_to_init) {
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if (driver_name) {
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SDL_SetError("Audio target '%s' not available", driver_name);
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} else {
SDL_SetError("No available audio device");
}
}
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SDL_memset(¤t_audio, 0, sizeof(current_audio));
return (-1); /* No driver was available, so fail. */
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}
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finalize_audio_entry_points();
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return (0);
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}
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/*
* Get the current audio driver name
*/
const char *
SDL_GetCurrentAudioDriver()
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{
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return current_audio.name;
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}
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int
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SDL_GetNumAudioDevices(int iscapture)
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{
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if (!SDL_WasInit(SDL_INIT_AUDIO)) {
return -1;
}
if ((iscapture) && (!current_audio.impl.HasCaptureSupport)) {
return 0;
}
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if ((iscapture) && (current_audio.impl.OnlyHasDefaultInputDevice)) {
return 1;
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}
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if ((!iscapture) && (current_audio.impl.OnlyHasDefaultOutputDevice)) {
return 1;
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}
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return current_audio.impl.DetectDevices(iscapture);
}
const char *
SDL_GetAudioDeviceName(int index, int iscapture)
{
if (!SDL_WasInit(SDL_INIT_AUDIO)) {
SDL_SetError("Audio subsystem is not initialized");
return NULL;
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}
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if ((iscapture) && (!current_audio.impl.HasCaptureSupport)) {
SDL_SetError("No capture support");
return NULL;
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}
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if (index < 0) {
SDL_SetError("No such device");
return NULL;
}
if ((iscapture) && (current_audio.impl.OnlyHasDefaultInputDevice)) {
return DEFAULT_INPUT_DEVNAME;
}
if ((!iscapture) && (current_audio.impl.OnlyHasDefaultOutputDevice)) {
return DEFAULT_OUTPUT_DEVNAME;
}
return current_audio.impl.GetDeviceName(index, iscapture);
}
static void
697
close_audio_device(SDL_AudioDevice * device)
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700
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{
device->enabled = 0;
if (device->thread != NULL) {
SDL_WaitThread(device->thread, NULL);
}
if (device->mixer_lock != NULL) {
SDL_DestroyMutex(device->mixer_lock);
705
}
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if (device->fake_stream != NULL) {
SDL_FreeAudioMem(device->fake_stream);
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}
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719
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723
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if (device->convert.needed) {
SDL_FreeAudioMem(device->convert.buf);
}
if (device->opened) {
current_audio.impl.CloseDevice(device);
device->opened = 0;
}
SDL_FreeAudioMem(device);
}
/*
* Sanity check desired AudioSpec for SDL_OpenAudio() in (orig).
* Fills in a sanitized copy in (prepared).
* Returns non-zero if okay, zero on fatal parameters in (orig).
*/
static int
726
prepare_audiospec(const SDL_AudioSpec * orig, SDL_AudioSpec * prepared)
727
{
728
SDL_memcpy(prepared, orig, sizeof(SDL_AudioSpec));
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731
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if (orig->callback == NULL) {
SDL_SetError("SDL_OpenAudio() passed a NULL callback");
return 0;
}
if (orig->freq == 0) {
const char *env = SDL_getenv("SDL_AUDIO_FREQUENCY");
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if ((!env) || ((prepared->freq = SDL_atoi(env)) == 0)) {
prepared->freq = 22050; /* a reasonable default */
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}
}
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743
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if (orig->format == 0) {
const char *env = SDL_getenv("SDL_AUDIO_FORMAT");
if ((!env) || ((prepared->format = SDL_ParseAudioFormat(env)) == 0)) {
745
prepared->format = AUDIO_S16; /* a reasonable default */
746
747
748
749
}
}
switch (orig->channels) {
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case 0:{
const char *env = SDL_getenv("SDL_AUDIO_CHANNELS");
752
if ((!env) || ((prepared->channels = (Uint8) SDL_atoi(env)) == 0)) {
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prepared->channels = 2; /* a reasonable default */
}
break;
756
}
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case 1: /* Mono */
case 2: /* Stereo */
case 4: /* surround */
case 6: /* surround with center and lfe */
break;
default:
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764
SDL_SetError("Unsupported number of audio channels.");
return 0;
765
}
766
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if (orig->samples == 0) {
const char *env = SDL_getenv("SDL_AUDIO_SAMPLES");
769
if ((!env) || ((prepared->samples = (Uint16) SDL_atoi(env)) == 0)) {
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/* Pick a default of ~46 ms at desired frequency */
/* !!! FIXME: remove this when the non-Po2 resampling is in. */
const int samples = (prepared->freq / 1000) * 46;
int power2 = 1;
while (power2 < samples) {
power2 *= 2;
}
prepared->samples = power2;
778
779
}
}
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/* Calculate the silence and size of the audio specification */
SDL_CalculateAudioSpec(prepared);
return 1;
}
static SDL_AudioDeviceID
open_audio_device(const char *devname, int iscapture,
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const SDL_AudioSpec * desired, SDL_AudioSpec * obtained,
int allowed_changes, int min_id)
792
793
{
SDL_AudioDeviceID id = 0;
794
SDL_AudioSpec _obtained;
795
SDL_AudioDevice *device;
796
SDL_bool build_cvt;
797
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799
800
801
int i = 0;
if (!SDL_WasInit(SDL_INIT_AUDIO)) {
SDL_SetError("Audio subsystem is not initialized");
return 0;
802
}
803
804
805
806
if ((iscapture) && (!current_audio.impl.HasCaptureSupport)) {
SDL_SetError("No capture support");
return 0;
807
}
808
809
810
811
812
if (!obtained) {
obtained = &_obtained;
}
if (!prepare_audiospec(desired, obtained)) {
813
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return 0;
}
815
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/* If app doesn't care about a specific device, let the user override. */
if (devname == NULL) {
devname = SDL_getenv("SDL_AUDIO_DEVICE_NAME");
}
820
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828
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/*
* Catch device names at the high level for the simple case...
* This lets us have a basic "device enumeration" for systems that
* don't have multiple devices, but makes sure the device name is
* always NULL when it hits the low level.
*
* Also make sure that the simple case prevents multiple simultaneous
* opens of the default system device.
*/
830
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832
833
834
835
836
if ((iscapture) && (current_audio.impl.OnlyHasDefaultInputDevice)) {
if ((devname) && (SDL_strcmp(devname, DEFAULT_INPUT_DEVNAME) != 0)) {
SDL_SetError("No such device");
return 0;
}
devname = NULL;
837
838
839
840
841
842
843
for (i = 0; i < SDL_arraysize(open_devices); i++) {
if ((open_devices[i]) && (open_devices[i]->iscapture)) {
SDL_SetError("Audio device already open");
return 0;
}
}
844
845
}
846
847
848
849
850
851
if ((!iscapture) && (current_audio.impl.OnlyHasDefaultOutputDevice)) {
if ((devname) && (SDL_strcmp(devname, DEFAULT_OUTPUT_DEVNAME) != 0)) {
SDL_SetError("No such device");
return 0;
}
devname = NULL;
852
853
854
855
856
857
858
859
for (i = 0; i < SDL_arraysize(open_devices); i++) {
if ((open_devices[i]) && (!open_devices[i]->iscapture)) {
SDL_SetError("Audio device already open");
return 0;
}
}
}
860
861
device = (SDL_AudioDevice *) SDL_AllocAudioMem(sizeof(SDL_AudioDevice));
862
863
864
if (device == NULL) {
SDL_OutOfMemory();
return 0;
865
}
866
SDL_memset(device, '\0', sizeof(SDL_AudioDevice));
867
device->spec = *obtained;
868
869
870
device->enabled = 1;
device->paused = 1;
device->iscapture = iscapture;
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
/* Create a semaphore for locking the sound buffers */
if (!current_audio.impl.SkipMixerLock) {
device->mixer_lock = SDL_CreateMutex();
if (device->mixer_lock == NULL) {
close_audio_device(device);
SDL_SetError("Couldn't create mixer lock");
return 0;
}
}
if (!current_audio.impl.OpenDevice(device, devname, iscapture)) {
close_audio_device(device);
return 0;
}
device->opened = 1;
887
888
/* Allocate a fake audio memory buffer */
889
device->fake_stream = (Uint8 *)SDL_AllocAudioMem(device->spec.size);
890
891
if (device->fake_stream == NULL) {
close_audio_device(device);
892
SDL_OutOfMemory();
893
return 0;
894
895
}
896
897
898
899
900
901
/* If the audio driver changes the buffer size, accept it */
if (device->spec.samples != obtained->samples) {
obtained->samples = device->spec.samples;
SDL_CalculateAudioSpec(obtained);
}
902
/* See if we need to do any conversion */
903
904
905
906
907
908
909
910
911
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913
914
915
916
917
918
919
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921
922
923
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925
build_cvt = SDL_FALSE;
if (obtained->freq != device->spec.freq) {
if (allowed_changes & SDL_AUDIO_ALLOW_FREQUENCY_CHANGE) {
obtained->freq = device->spec.freq;
} else {
build_cvt = SDL_TRUE;
}
}
if (obtained->format != device->spec.format) {
if (allowed_changes & SDL_AUDIO_ALLOW_FORMAT_CHANGE) {
obtained->format = device->spec.format;
} else {
build_cvt = SDL_TRUE;
}
}
if (obtained->channels != device->spec.channels) {
if (allowed_changes & SDL_AUDIO_ALLOW_CHANNELS_CHANGE) {
obtained->channels = device->spec.channels;
} else {
build_cvt = SDL_TRUE;
}
}
if (build_cvt) {
926
/* Build an audio conversion block */
927
if (SDL_BuildAudioCVT(&device->convert,
928
929
obtained->format, obtained->channels,
obtained->freq,
930
931
932
933
device->spec.format, device->spec.channels,
device->spec.freq) < 0) {
close_audio_device(device);
return 0;
934
}
935
if (device->convert.needed) {
936
device->convert.len = (int) (((double) obtained->size) /
937
device->convert.len_ratio);
938
939
940
941
942
943
device->convert.buf =
(Uint8 *) SDL_AllocAudioMem(device->convert.len *
device->convert.len_mult);
if (device->convert.buf == NULL) {
close_audio_device(device);
944
SDL_OutOfMemory();
945
return 0;
946
947
948
}
}
}
949
950
/* Find an available device ID and store the structure... */
951
for (id = min_id - 1; id < SDL_arraysize(open_devices); id++) {
952
953
954
955
956
957
958
959
960
961
962
963
if (open_devices[id] == NULL) {
open_devices[id] = device;
break;
}
}
if (id == SDL_arraysize(open_devices)) {
SDL_SetError("Too many open audio devices");
close_audio_device(device);
return 0;
}
964
/* Start the audio thread if necessary */
965
if (!current_audio.impl.ProvidesOwnCallbackThread) {
966
/* Start the audio thread */
967
/* !!! FIXME: this is nasty. */
968
#if (defined(__WIN32__) && !defined(_WIN32_WCE)) && !defined(HAVE_LIBC)
969
#undef SDL_CreateThread
970
device->thread = SDL_CreateThread(SDL_RunAudio, device, NULL, NULL);
971
#else
972
device->thread = SDL_CreateThread(SDL_RunAudio, device);
973
#endif
974
if (device->thread == NULL) {
975
SDL_CloseAudioDevice(id + 1);
976
SDL_SetError("Couldn't create audio thread");
977
978
979
980
return 0;
}
}
981
return id + 1;
982
983
984
985
}
int
986
SDL_OpenAudio(SDL_AudioSpec * desired, SDL_AudioSpec * obtained)
987
988
989
990
991
992
{
SDL_AudioDeviceID id = 0;
/* Start up the audio driver, if necessary. This is legacy behaviour! */
if (!SDL_WasInit(SDL_INIT_AUDIO)) {
if (SDL_InitSubSystem(SDL_INIT_AUDIO) < 0) {
993
994
return (-1);
}
995
}
996
997
998
999
1000
/* SDL_OpenAudio() is legacy and can only act on Device ID #1. */
if (open_devices[0] != NULL) {
SDL_SetError("Audio device is already opened");
return (-1);