diff options
Diffstat (limited to '3rdparty/SDL2/src/audio/emscripten/SDL_emscriptenaudio.c')
-rw-r--r-- | 3rdparty/SDL2/src/audio/emscripten/SDL_emscriptenaudio.c | 443 |
1 files changed, 0 insertions, 443 deletions
diff --git a/3rdparty/SDL2/src/audio/emscripten/SDL_emscriptenaudio.c b/3rdparty/SDL2/src/audio/emscripten/SDL_emscriptenaudio.c deleted file mode 100644 index 839d445ee61..00000000000 --- a/3rdparty/SDL2/src/audio/emscripten/SDL_emscriptenaudio.c +++ /dev/null @@ -1,443 +0,0 @@ -/* - Simple DirectMedia Layer - Copyright (C) 1997-2016 Sam Lantinga <slouken@libsdl.org> - - 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" - -#if SDL_AUDIO_DRIVER_EMSCRIPTEN - -#include "SDL_audio.h" -#include "SDL_log.h" -#include "../SDL_audio_c.h" -#include "SDL_emscriptenaudio.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) -{ - 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) { - EM_ASM_ARGS({ - var numChannels = SDL2.audio.currentOutputBuffer['numberOfChannels']; - for (var c = 0; c < numChannels; ++c) { - var channelData = SDL2.audio.currentOutputBuffer['getChannelData'](c); - if (channelData.length != $1) { - throw 'Web Audio output buffer length mismatch! Destination size: ' + channelData.length + ' samples vs expected ' + $1 + ' samples!'; - } - - for (var j = 0; j < $1; ++j) { - channelData[j] = HEAPF32[$0 + ((j*numChannels + c) << 2) >> 2]; - } - } - }, buf, byte_len / bytes / this->spec.channels); - } -} - -static void -HandleCaptureProcess(_THIS) -{ - Uint8 *buf; - int buflen; - - /* Only do something if audio is enabled */ - if (!SDL_AtomicGet(&this->enabled) || SDL_AtomicGet(&this->paused)) { - 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!'; - } - - 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); - - /* okay, we've got an interleaved float32 array in C now. */ - - if (this->convert.needed) { - SDL_ConvertAudio(&this->convert); - } - - /* Send it to the app. */ - (*this->spec.callback) (this->spec.userdata, buf, buflen); -} - - - -static void -EMSCRIPTENAUDIO_CloseDevice(_THIS) -{ - EM_ASM_({ - if ($0) { - if (SDL2.capture.silenceTimer !== undefined) { - clearTimeout(SDL2.capture.silenceTimer); - } - if (SDL2.capture.stream !== undefined) { - var tracks = SDL2.capture.stream.getAudioTracks(); - for (var i = 0; i < tracks.length; i++) { - SDL2.capture.stream.removeTrack(tracks[i]); - } - SDL2.capture.stream = undefined; - } - if (SDL2.capture.scriptProcessorNode !== undefined) { - SDL2.capture.scriptProcessorNode.onaudioprocess = function(audioProcessingEvent) {}; - SDL2.capture.scriptProcessorNode.disconnect(); - SDL2.capture.scriptProcessorNode = undefined; - } - if (SDL2.capture.mediaStreamNode !== undefined) { - SDL2.capture.mediaStreamNode.disconnect(); - SDL2.capture.mediaStreamNode = undefined; - } - if (SDL2.capture.silenceBuffer !== undefined) { - SDL2.capture.silenceBuffer = undefined - } - SDL2.capture = undefined; - } else { - if (SDL2.audio.scriptProcessorNode != undefined) { - SDL2.audio.scriptProcessorNode.disconnect(); - SDL2.audio.scriptProcessorNode = undefined; - } - SDL2.audio = undefined; - } - if ((SDL2.audioContext !== undefined) && (SDL2.audio === undefined) && (SDL2.capture === undefined)) { - SDL2.audioContext.close(); - SDL2.audioContext = undefined; - } - }, this->iscapture); - - SDL_free(this->hidden->mixbuf); - SDL_free(this->hidden); -} - -static int -EMSCRIPTENAUDIO_OpenDevice(_THIS, void *handle, const char *devname, int iscapture) -{ - SDL_bool valid_format = SDL_FALSE; - SDL_AudioFormat test_format; - int i; - float f; - int result; - - /* based on parts of library_sdl.js */ - - /* create context (TODO: this puts stuff in the global namespace...)*/ - result = EM_ASM_INT({ - if(typeof(SDL2) === 'undefined') { - SDL2 = {}; - } - if (!$0) { - SDL2.audio = {}; - } else { - SDL2.capture = {}; - } - - if (!SDL2.audioContext) { - if (typeof(AudioContext) !== 'undefined') { - SDL2.audioContext = new AudioContext(); - } else if (typeof(webkitAudioContext) !== 'undefined') { - SDL2.audioContext = new webkitAudioContext(); - } - } - return SDL2.audioContext === undefined ? -1 : 0; - }, iscapture); - if (result < 0) { - return SDL_SetError("Web Audio API is not available!"); - } - - test_format = SDL_FirstAudioFormat(this->spec.format); - while ((!valid_format) && (test_format)) { - switch (test_format) { - case AUDIO_F32: /* web audio only supports floats */ - this->spec.format = test_format; - - valid_format = SDL_TRUE; - break; - } - test_format = SDL_NextAudioFormat(); - } - - if (!valid_format) { - /* Didn't find a compatible format :( */ - return SDL_SetError("No compatible audio format!"); - } - - /* Initialize all variables that we clean on shutdown */ - this->hidden = (struct SDL_PrivateAudioData *) - SDL_malloc((sizeof *this->hidden)); - if (this->hidden == NULL) { - return SDL_OutOfMemory(); - } - SDL_zerop(this->hidden); - - /* 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; - } - - SDL_CalculateAudioSpec(&this->spec); - - if (iscapture) { - /* The idea is to take the capture media stream, hook it up to an - audio graph where we can pass it through a ScriptProcessorNode - to access the raw PCM samples and push them to the SDL app's - callback. From there, we "process" the audio data into silence - and forget about it. */ - - /* This should, strictly speaking, use MediaRecorder for capture, but - this API is cleaner to use and better supported, and fires a - callback whenever there's enough data to fire down into the app. - The downside is that we are spending CPU time silencing a buffer - that the audiocontext uselessly mixes into any output. On the - upside, both of those things are not only run in native code in - the browser, they're probably SIMD code, too. MediaRecorder - feels like it's a pretty inefficient tapdance in similar ways, - to be honest. */ - - EM_ASM_({ - var have_microphone = function(stream) { - //console.log('SDL audio capture: we have a microphone! Replacing silence callback.'); - if (SDL2.capture.silenceTimer !== undefined) { - clearTimeout(SDL2.capture.silenceTimer); - SDL2.capture.silenceTimer = undefined; - } - SDL2.capture.mediaStreamNode = SDL2.audioContext.createMediaStreamSource(stream); - SDL2.capture.scriptProcessorNode = SDL2.audioContext.createScriptProcessor($1, $0, 1); - SDL2.capture.scriptProcessorNode.onaudioprocess = function(audioProcessingEvent) { - if ((SDL2 === undefined) || (SDL2.capture === undefined)) { return; } - audioProcessingEvent.outputBuffer.getChannelData(0).fill(0.0); - SDL2.capture.currentCaptureBuffer = audioProcessingEvent.inputBuffer; - Runtime.dynCall('vi', $2, [$3]); - }; - SDL2.capture.mediaStreamNode.connect(SDL2.capture.scriptProcessorNode); - SDL2.capture.scriptProcessorNode.connect(SDL2.audioContext.destination); - SDL2.capture.stream = stream; - }; - - var no_microphone = function(error) { - //console.log('SDL audio capture: we DO NOT have a microphone! (' + error.name + ')...leaving silence callback running.'); - }; - - /* we write silence to the audio callback until the microphone is available (user approves use, etc). */ - SDL2.capture.silenceBuffer = SDL2.audioContext.createBuffer($0, $1, SDL2.audioContext.sampleRate); - SDL2.capture.silenceBuffer.getChannelData(0).fill(0.0); - var silence_callback = function() { - SDL2.capture.currentCaptureBuffer = SDL2.capture.silenceBuffer; - Runtime.dynCall('vi', $2, [$3]); - }; - - SDL2.capture.silenceTimer = setTimeout(silence_callback, ($1 / SDL2.audioContext.sampleRate) * 1000); - - if ((navigator.mediaDevices !== undefined) && (navigator.mediaDevices.getUserMedia !== undefined)) { - navigator.mediaDevices.getUserMedia({ audio: true, video: false }).then(have_microphone).catch(no_microphone); - } else if (navigator.webkitGetUserMedia !== undefined) { - navigator.webkitGetUserMedia({ audio: true, video: false }, have_microphone, no_microphone); - } - }, this->spec.channels, this->spec.samples, HandleCaptureProcess, this); - } else { - /* setup a ScriptProcessorNode */ - EM_ASM_ARGS({ - SDL2.audio.scriptProcessorNode = SDL2.audioContext['createScriptProcessor']($1, 0, $0); - SDL2.audio.scriptProcessorNode['onaudioprocess'] = function (e) { - if ((SDL2 === undefined) || (SDL2.audio === undefined)) { return; } - SDL2.audio.currentOutputBuffer = e['outputBuffer']; - Runtime.dynCall('vi', $2, [$3]); - }; - SDL2.audio.scriptProcessorNode['connect'](SDL2.audioContext['destination']); - }, this->spec.channels, this->spec.samples, HandleAudioProcess, this); - } - - return 0; -} - -static int -EMSCRIPTENAUDIO_Init(SDL_AudioDriverImpl * impl) -{ - /* Set the function pointers */ - impl->OpenDevice = EMSCRIPTENAUDIO_OpenDevice; - impl->CloseDevice = EMSCRIPTENAUDIO_CloseDevice; - - impl->OnlyHasDefaultOutputDevice = 1; - - /* no threads here */ - impl->SkipMixerLock = 1; - impl->ProvidesOwnCallbackThread = 1; - - /* check availability */ - const int available = EM_ASM_INT_V({ - if (typeof(AudioContext) !== 'undefined') { - return 1; - } else if (typeof(webkitAudioContext) !== 'undefined') { - return 1; - } - return 0; - }); - - if (!available) { - SDL_SetError("No audio context available"); - } - - const int capture_available = available && EM_ASM_INT_V({ - if ((typeof(navigator.mediaDevices) !== 'undefined') && (typeof(navigator.mediaDevices.getUserMedia) !== 'undefined')) { - return 1; - } else if (typeof(navigator.webkitGetUserMedia) !== 'undefined') { - return 1; - } - return 0; - }); - - impl->HasCaptureSupport = capture_available ? SDL_TRUE : SDL_FALSE; - impl->OnlyHasDefaultCaptureDevice = capture_available ? SDL_TRUE : SDL_FALSE; - - return available; -} - -AudioBootStrap EMSCRIPTENAUDIO_bootstrap = { - "emscripten", "SDL emscripten audio driver", EMSCRIPTENAUDIO_Init, 0 -}; - -#endif /* SDL_AUDIO_DRIVER_EMSCRIPTEN */ - -/* vi: set ts=4 sw=4 expandtab: */ |