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emscriptenaudio: Reworked to use SDL_AudioStream.

Ryan C. Gordon 2017-01-05 21:31:02 -05:00
parent 3761b5f60b
commit f07a1a5ad5
3 changed files with 83 additions and 155 deletions
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23
src/audio/SDL_audio.c
View File

@ -1243,17 +1243,8 @@ open_audio_device(const char *devname, int iscapture,
device->spec.userdata = device;
}
open_devices[id] = device; /* add it to our list of open devices. */
/* Start the audio thread if necessary */
if (!current_audio.impl.ProvidesOwnCallbackThread) {
/* Start the audio thread */
/* !!! FIXME: we don't force the audio thread stack size here if it calls into user code, but maybe we should? */
/* buffer queueing callback only needs a few bytes, so make the stack tiny. */
const size_t stacksize = is_internal_thread ? 64 * 1024 : 0;
char threadname[64];
/* Allocate a fake audio buffer; only used by our internal threads. */
/* !!! FIXME: rename this from fake_stream */
/* Allocate a scratch audio buffer */
device->fake_stream_len = build_stream ? device->callbackspec.size : 0;
if (device->spec.size > device->fake_stream_len) {
device->fake_stream_len = device->spec.size;
@ -1267,6 +1258,16 @@ open_audio_device(const char *devname, int iscapture,
return 0;
}
open_devices[id] = device; /* add it to our list of open devices. */
/* Start the audio thread if necessary */
if (!current_audio.impl.ProvidesOwnCallbackThread) {
/* Start the audio thread */
/* !!! FIXME: we don't force the audio thread stack size here if it calls into user code, but maybe we should? */
/* buffer queueing callback only needs a few bytes, so make the stack tiny. */
const size_t stacksize = is_internal_thread ? 64 * 1024 : 0;
char threadname[64];
SDL_snprintf(threadname, sizeof (threadname), "SDLAudioDev%d", (int) device->id);
device->thread = SDL_CreateThreadInternal(iscapture ? SDL_CaptureAudio : SDL_RunAudio, threadname, stacksize, device);

208
src/audio/emscripten/SDL_emscriptenaudio.c
View File

@ -26,98 +26,14 @@
#include "SDL_log.h"
#include "../SDL_audio_c.h"
#include "SDL_emscriptenaudio.h"
#include "SDL_assert.h"
#include <emscripten/emscripten.h>
static int
copyData(_THIS)
{
int byte_len;
if (this->hidden->write_off + this->convert.len_cvt > this->hidden->mixlen) {
if (this->hidden->write_off > this->hidden->read_off) {
SDL_memmove(this->hidden->mixbuf,
this->hidden->mixbuf + this->hidden->read_off,
this->hidden->mixlen - this->hidden->read_off);
this->hidden->write_off = this->hidden->write_off - this->hidden->read_off;
} else {
this->hidden->write_off = 0;
}
this->hidden->read_off = 0;
}
SDL_memcpy(this->hidden->mixbuf + this->hidden->write_off,
this->convert.buf,
this->convert.len_cvt);
this->hidden->write_off += this->convert.len_cvt;
byte_len = this->hidden->write_off - this->hidden->read_off;
return byte_len;
}
static void
HandleAudioProcess(_THIS)
FeedAudioDevice(_THIS, const void *buf, const int buflen)
{
Uint8 *buf = NULL;
int byte_len = 0;
int bytes = SDL_AUDIO_BITSIZE(this->spec.format) / 8;
/* Only do something if audio is enabled */
if (!SDL_AtomicGet(&this->enabled) || SDL_AtomicGet(&this->paused)) {
return;
}
if (this->convert.needed) {
const int bytes_in = SDL_AUDIO_BITSIZE(this->convert.src_format) / 8;
if (this->hidden->conv_in_len != 0) {
this->convert.len = this->hidden->conv_in_len * bytes_in * this->spec.channels;
}
(*this->spec.callback) (this->spec.userdata,
this->convert.buf,
this->convert.len);
SDL_ConvertAudio(&this->convert);
buf = this->convert.buf;
byte_len = this->convert.len_cvt;
/* size mismatch*/
if (byte_len != this->spec.size) {
if (!this->hidden->mixbuf) {
this->hidden->mixlen = this->spec.size > byte_len ? this->spec.size * 2 : byte_len * 2;
this->hidden->mixbuf = SDL_malloc(this->hidden->mixlen);
}
/* copy existing data */
byte_len = copyData(this);
/* read more data*/
while (byte_len < this->spec.size) {
(*this->spec.callback) (this->spec.userdata,
this->convert.buf,
this->convert.len);
SDL_ConvertAudio(&this->convert);
byte_len = copyData(this);
}
byte_len = this->spec.size;
buf = this->hidden->mixbuf + this->hidden->read_off;
this->hidden->read_off += byte_len;
}
} else {
if (!this->hidden->mixbuf) {
this->hidden->mixlen = this->spec.size;
this->hidden->mixbuf = SDL_malloc(this->hidden->mixlen);
}
(*this->spec.callback) (this->spec.userdata,
this->hidden->mixbuf,
this->hidden->mixlen);
buf = this->hidden->mixbuf;
byte_len = this->hidden->mixlen;
}
if (buf) {
const int framelen = (SDL_AUDIO_BITSIZE(this->spec.format) / 8) * this->spec.channels;
EM_ASM_ARGS({
var numChannels = SDL2.audio.currentOutputBuffer['numberOfChannels'];
for (var c = 0; c < numChannels; ++c) {
@ -127,72 +43,101 @@ HandleAudioProcess(_THIS)
}
for (var j = 0; j < $1; ++j) {
channelData[j] = HEAPF32[$0 + ((j*numChannels + c) << 2) >> 2];
channelData[j] = HEAPF32[$0 + ((j*numChannels + c) << 2) >> 2]; /* !!! FIXME: why are these shifts here? */
}
}
}, buf, byte_len / bytes / this->spec.channels);
}, buf, buflen / framelen);
}
static void
HandleAudioProcess(_THIS)
{
SDL_AudioCallback callback = this->spec.callback;
const int stream_len = this->callbackspec.size;
/* Only do something if audio is enabled */
if (!SDL_AtomicGet(&this->enabled) || SDL_AtomicGet(&this->paused)) {
if (this->stream) {
SDL_AudioStreamClear(this->stream);
}
return;
}
if (this->stream == NULL) { /* no conversion necessary. */
SDL_assert(this->spec.size == stream_len);
callback(this->spec.userdata, this->fake_stream, stream_len);
} else { /* streaming/converting */
int got;
while (SDL_AudioStreamAvailable(this->stream) < ((int) this->spec.size)) {
callback(this->spec.userdata, this->fake_stream, stream_len);
if (SDL_AudioStreamPut(this->stream, this->fake_stream, stream_len) == -1) {
SDL_AudioStreamClear(this->stream);
SDL_AtomicSet(&this->enabled, 0);
}
}
got = SDL_AudioStreamGet(this->stream, this->spec.size, this->fake_stream, this->spec.size);
SDL_assert((got < 0) || (got == this->spec.size));
if (got != this->spec.size) {
SDL_memset(this->fake_stream, this->spec.silence, this->spec.size);
}
}
FeedAudioDevice(this, this->fake_stream, this->spec.size);
}
static void
HandleCaptureProcess(_THIS)
{
Uint8 *buf;
int buflen;
SDL_AudioCallback callback = this->spec.callback;
const int stream_len = this->callbackspec.size;
/* Only do something if audio is enabled */
if (!SDL_AtomicGet(&this->enabled) || SDL_AtomicGet(&this->paused)) {
SDL_AudioStreamClear(this->stream);
return;
}
if (this->convert.needed) {
buf = this->convert.buf;
buflen = this->convert.len_cvt;
} else {
if (!this->hidden->mixbuf) {
this->hidden->mixbuf = (Uint8 *) SDL_malloc(this->spec.size);
if (!this->hidden->mixbuf) {
return; /* oh well. */
}
}
buf = this->hidden->mixbuf;
buflen = this->spec.size;
}
EM_ASM_ARGS({
var numChannels = SDL2.capture.currentCaptureBuffer.numberOfChannels;
if (numChannels == 1) { /* fastpath this a little for the common (mono) case. */
var channelData = SDL2.capture.currentCaptureBuffer.getChannelData(0);
if (channelData.length != $1) {
throw 'Web Audio capture buffer length mismatch! Destination size: ' + channelData.length + ' samples vs expected ' + $1 + ' samples!';
}
for (var j = 0; j < $1; ++j) {
setValue($0 + (j * 4), channelData[j], 'float');
}
} else {
for (var c = 0; c < numChannels; ++c) {
var channelData = SDL2.capture.currentCaptureBuffer.getChannelData(c);
if (channelData.length != $1) {
throw 'Web Audio capture buffer length mismatch! Destination size: ' + channelData.length + ' samples vs expected ' + $1 + ' samples!';
}
if (numChannels == 1) { /* fastpath this a little for the common (mono) case. */
for (var j = 0; j < $1; ++j) {
setValue($0 + (j * 4), channelData[j], 'float');
}
} else {
for (var j = 0; j < $1; ++j) {
setValue($0 + (((j * numChannels) + c) * 4), channelData[j], 'float');
}
}
}
}, buf, (this->spec.size / sizeof (float)) / this->spec.channels);
}, this->fake_stream, (this->spec.size / sizeof (float)) / this->spec.channels);
/* okay, we've got an interleaved float32 array in C now. */
if (this->convert.needed) {
SDL_ConvertAudio(&this->convert);
if (this->stream == NULL) { /* no conversion necessary. */
SDL_assert(this->spec.size == stream_len);
callback(this->spec.userdata, this->fake_stream, stream_len);
} else { /* streaming/converting */
if (SDL_AudioStreamPut(this->stream, this->fake_stream, this->spec.size) == -1) {
SDL_AtomicSet(&this->enabled, 0);
}
/* Send it to the app. */
(*this->spec.callback) (this->spec.userdata, buf, buflen);
while (SDL_AudioStreamAvailable(this->stream) >= stream_len) {
const int got = SDL_AudioStreamGet(this->stream, stream_len, this->fake_stream, stream_len);
SDL_assert((got < 0) || (got == stream_len));
if (got != stream_len) {
SDL_memset(this->fake_stream, this->callbackspec.silence, stream_len);
}
callback(this->spec.userdata, this->fake_stream, stream_len); /* Send it to the app. */
}
}
}
static void
@ -236,8 +181,9 @@ EMSCRIPTENAUDIO_CloseDevice(_THIS)
}
}, this->iscapture);
SDL_free(this->hidden->mixbuf);
#if 0 /* !!! FIXME: currently not used. Can we move some stuff off the SDL2 namespace? --ryan. */
SDL_free(this->hidden);
#endif
}
static int
@ -245,8 +191,6 @@ EMSCRIPTENAUDIO_OpenDevice(_THIS, void *handle, const char *devname, int iscaptu
{
SDL_bool valid_format = SDL_FALSE;
SDL_AudioFormat test_format;
int i;
float f;
int result;
/* based on parts of library_sdl.js */
@ -293,29 +237,17 @@ EMSCRIPTENAUDIO_OpenDevice(_THIS, void *handle, const char *devname, int iscaptu
}
/* Initialize all variables that we clean on shutdown */
#if 0 /* !!! FIXME: currently not used. Can we move some stuff off the SDL2 namespace? --ryan. */
this->hidden = (struct SDL_PrivateAudioData *)
SDL_malloc((sizeof *this->hidden));
if (this->hidden == NULL) {
return SDL_OutOfMemory();
}
SDL_zerop(this->hidden);
#endif
/* limit to native freq */
const int sampleRate = EM_ASM_INT_V({
return SDL2.audioContext.sampleRate;
});
if(this->spec.freq != sampleRate) {
for (i = this->spec.samples; i > 0; i--) {
f = (float)i / (float)sampleRate * (float)this->spec.freq;
if (SDL_floor(f) == f) {
this->hidden->conv_in_len = SDL_floor(f);
break;
}
}
this->spec.freq = sampleRate;
}
this->spec.freq = EM_ASM_INT_V({ return SDL2.audioContext.sampleRate; });
SDL_CalculateAudioSpec(&this->spec);

7
src/audio/emscripten/SDL_emscriptenaudio.h
View File

@ -30,12 +30,7 @@
struct SDL_PrivateAudioData
{
Uint8 *mixbuf;
Uint32 mixlen;
Uint32 conv_in_len;
Uint32 write_off, read_off;
int unused;
};
#endif /* _SDL_emscriptenaudio_h */