Update source to SDL2 2.0.12

Edward Rudd

2020-05-02 03f8528315fa46c95991a34f3325d7b33ae5538c

 source/src/audio/emscripten/SDL_emscriptenaudio.c

@@ -1,6 +1,6 @@
/*
  Simple DirectMedia Layer
  Copyright (C) 1997-2018 Sam Lantinga <slouken@libsdl.org>
  Copyright (C) 1997-2020 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
@@ -35,6 +35,7 @@
{
    const int framelen = (SDL_AUDIO_BITSIZE(this->spec.format) / 8) * this->spec.channels;
    EM_ASM_ARGS({
        var SDL2 = Module['SDL2'];
        var numChannels = SDL2.audio.currentOutputBuffer['numberOfChannels'];
        for (var c = 0; c < numChannels; ++c) {
            var channelData = SDL2.audio.currentOutputBuffer['getChannelData'](c);
@@ -100,6 +101,7 @@
    }

    EM_ASM_ARGS({
        var SDL2 = Module['SDL2'];
        var numChannels = SDL2.capture.currentCaptureBuffer.numberOfChannels;
        for (var c = 0; c < numChannels; ++c) {
            var channelData = SDL2.capture.currentCaptureBuffer.getChannelData(c);
@@ -145,6 +147,7 @@
EMSCRIPTENAUDIO_CloseDevice(_THIS)
{
    EM_ASM_({
        var SDL2 = Module['SDL2'];
        if ($0) {
            if (SDL2.capture.silenceTimer !== undefined) {
                clearTimeout(SDL2.capture.silenceTimer);
@@ -196,11 +199,12 @@

    /* based on parts of library_sdl.js */

    /* create context (TODO: this puts stuff in the global namespace...)*/
    /* create context */
    result = EM_ASM_INT({
        if(typeof(SDL2) === 'undefined') {
            SDL2 = {};
        if(typeof(Module['SDL2']) === 'undefined') {
            Module['SDL2'] = {};
        }
        var SDL2 = Module['SDL2'];
        if (!$0) {
            SDL2.audio = {};
        } else {
@@ -246,9 +250,13 @@
    }
    SDL_zerop(this->hidden);
#endif
    this->hidden = (struct SDL_PrivateAudioData *)0x1;

    /* limit to native freq */
    this->spec.freq = EM_ASM_INT_V({ return SDL2.audioContext.sampleRate; });
    this->spec.freq = EM_ASM_INT_V({
      var SDL2 = Module['SDL2'];
      return SDL2.audioContext.sampleRate;
    });

    SDL_CalculateAudioSpec(&this->spec);

@@ -270,6 +278,7 @@
           to be honest. */

        EM_ASM_({
            var SDL2 = Module['SDL2'];
            var have_microphone = function(stream) {
                //console.log('SDL audio capture: we have a microphone! Replacing silence callback.');
                if (SDL2.capture.silenceTimer !== undefined) {
@@ -282,7 +291,7 @@
                    if ((SDL2 === undefined) || (SDL2.capture === undefined)) { return; }
                    audioProcessingEvent.outputBuffer.getChannelData(0).fill(0.0);
                    SDL2.capture.currentCaptureBuffer = audioProcessingEvent.inputBuffer;
                    Runtime.dynCall('vi', $2, [$3]);
                    dynCall('vi', $2, [$3]);
                };
                SDL2.capture.mediaStreamNode.connect(SDL2.capture.scriptProcessorNode);
                SDL2.capture.scriptProcessorNode.connect(SDL2.audioContext.destination);
@@ -298,7 +307,7 @@
            SDL2.capture.silenceBuffer.getChannelData(0).fill(0.0);
            var silence_callback = function() {
                SDL2.capture.currentCaptureBuffer = SDL2.capture.silenceBuffer;
                Runtime.dynCall('vi', $2, [$3]);
                dynCall('vi', $2, [$3]);
            };

            SDL2.capture.silenceTimer = setTimeout(silence_callback, ($1 / SDL2.audioContext.sampleRate) * 1000);
@@ -312,11 +321,12 @@
    } else {
        /* setup a ScriptProcessorNode */
        EM_ASM_ARGS({
            var SDL2 = Module['SDL2'];
            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]);
                dynCall('vi', $2, [$3]);
            };
            SDL2.audio.scriptProcessorNode['connect'](SDL2.audioContext['destination']);
        }, this->spec.channels, this->spec.samples, HandleAudioProcess, this);