348 lines
10 KiB
C++
348 lines
10 KiB
C++
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#include "decoder.h"
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#include <iostream>
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Decoder::Decoder():
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state(empty),
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sampleRate(0),
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channels(0),
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cachedLength(0),
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samplesPerFrame(0),
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glue(new uint8_t[GLUE_LENGTH]),
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cachedNext(NULL),
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cachedThis(NULL),
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cachedError(MAD_ERROR_NONE),
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cached(false),
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synth(new mad_synth()),
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stream(new mad_stream()),
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frame(new mad_frame()),
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context(0),
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pending()
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{
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for (int i = 0; i < GLUE_LENGTH; ++i) {
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glue[i] = 0;
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}
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mad_frame_init(frame);
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mad_stream_init(stream);
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mad_synth_init(synth);
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emscripten::val AudioContext = emscripten::val::global("AudioContext");
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if (!AudioContext.as<bool>()) {
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AudioContext = emscripten::val::global("webkitAudioContext");
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}
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context = AudioContext.new_();
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}
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Decoder::~Decoder()
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{
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context.call<void>("close");
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mad_synth_finish(synth);
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mad_stream_finish(stream);
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mad_frame_finish(frame);
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delete synth;
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delete stream;
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delete frame;
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delete[] glue;
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}
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void Decoder::addFragment(const emscripten::val& array)
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{
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uint32_t length = array["length"].as<uint32_t>();
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if (length < GLUE_LENGTH / 2) {
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std::cout << "Error: an attempt to add fragment smaller then half of the glue buffer, ignoring";
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return;
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}
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uint8_t* buffer = new uint8_t[length];
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for (int i = 0; i < length; ++i) {
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buffer[i] = array[std::to_string(i)].as<uint8_t>();
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}
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RawBuffer rb = {buffer, length};
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pending.push_back(rb);
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switch (state) {
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case empty:
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mad_stream_buffer(stream, buffer, length);
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for (int i = 0; i < GLUE_LENGTH/2; ++i) {
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glue[i] = buffer[length - GLUE_LENGTH/2 + i];
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}
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state = onBufferHalf;
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prepareNextBuffer();
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break;
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case onBufferHalf:
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for (int i = 0; i < GLUE_LENGTH/2; ++i) {
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glue[GLUE_LENGTH/2 + i] = buffer[i];
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}
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state = onBufferFull;
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break;
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case onBufferFull:
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break;
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case onGlueHalf:
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for (int i = 0; i < GLUE_LENGTH/2; ++i) {
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glue[GLUE_LENGTH/2 + i] = buffer[i];
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}
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state = onGlueFull;
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cached = false;
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prepareNextBuffer();
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break;
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case onGlueFull:
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break;
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}
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}
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emscripten::val Decoder::decode(uint32_t count)
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{
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emscripten::val ret = emscripten::val::undefined();
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int available = framesLeft(count);
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int success = 0;
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if (available > 0) {
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ret = context.call<emscripten::val>("createBuffer", channels, available * samplesPerFrame, sampleRate);
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std::vector<emscripten::val> chans(channels, emscripten::val::undefined());
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for (int i = 0; i < channels; ++i) {
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chans[i] = ret.call<emscripten::val>("getChannelData", i);
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}
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for (int i = 0; success < available; ++i) {
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int res = mad_frame_decode(frame, stream);
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if (res != 0) {
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if (MAD_RECOVERABLE(stream->error)) {
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std::cout << "Unexpected error during the decoding process: " << mad_stream_errorstr(stream) << std::endl;
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continue;
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} else {
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break;
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}
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}
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mad_synth_frame(synth, frame);
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for (int j = 0; j < samplesPerFrame; ++j) {
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for (int k = 0; k < channels; ++k) {
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float value = mad_f_todouble(synth->pcm.samples[k][j]);
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chans[k].set(std::to_string(success * samplesPerFrame + j), emscripten::val(value));
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}
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}
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++success;
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}
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cachedLength -= available;
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#if DEBUGGING
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std::cout << "Processed " << available << " frames, " << success << " successfully, last error " << mad_stream_errorstr(stream) << std::endl;
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#endif
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if (cachedLength == 0) {
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cached = false;
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prepareNextBuffer();
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}
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}
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return ret;
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}
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bool Decoder::hasMore() const
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{
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if (pending.size() == 1) {
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return stream->error != MAD_ERROR_BUFLEN;
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} else {
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return true;
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}
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}
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uint32_t Decoder::framesLeft(uint32_t max)
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{
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if (state == empty || state == onGlueHalf) {
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return 0;
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}
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if (cached == false) {
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mad_stream probe;
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mad_header ph;
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initializeProbe(probe);
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mad_header_init(&ph);
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sampleRate = 0;
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while (cachedLength < max) {
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if (mad_header_decode(&ph, &probe) == 0) {
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if (sampleRate == 0) {
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sampleRate = ph.samplerate;
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channels = MAD_NCHANNELS(&ph);
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samplesPerFrame = MAD_NSBSAMPLES(&ph) * 32; //not sure why 32, it's in libmad source
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} else {
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if (sampleRate != ph.samplerate || channels != MAD_NCHANNELS(&ph) || samplesPerFrame != MAD_NSBSAMPLES(&ph) * 32) {
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if (cachedLength > 0) {
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#if DEBUGGING
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std::cout << "sample rate " << sampleRate << " -> " << ph.samplerate << std::endl;
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std::cout << "channels " << channels << " -> " << MAD_NCHANNELS(&ph) << std::endl;
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std::cout << "samples per frame " << samplesPerFrame << " -> " << MAD_NSBSAMPLES(&ph) * 32 << std::endl;
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#endif
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probe.next_frame = probe.this_frame;
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break;
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}
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}
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}
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if (probe.next_frame > probe.this_frame) {
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++cachedLength;
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}
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} else {
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#if DEBUGGING
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std::cout << "framesLeft error: " << mad_stream_errorstr(&probe) << std::endl;
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#endif
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if (!MAD_RECOVERABLE(probe.error)) {
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break;
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}
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}
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}
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cachedNext = probe.next_frame;
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cachedThis = probe.this_frame;
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cachedError = probe.error;
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mad_header_finish(&ph);
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mad_stream_finish(&probe);
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#if DEBUGGING
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std::cout << cachedLength << " frames are available for decoding" << std::endl;
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#endif
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cached = true;
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}
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return std::min(cachedLength, max);
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}
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void Decoder::pullBuffer()
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{
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if (cached == false) {
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std::cout << "Error in pullBuffer method!" << std::endl;
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}
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stream->this_frame = cachedThis;
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stream->next_frame = cachedNext;
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stream->error = cachedError;
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}
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void Decoder::changeBuffer()
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{
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switch (state) {
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case empty:
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std::cout << "Wrong state on switchBuffer method - empty, aborting" << std::endl;
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case onBufferHalf:
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switchToGlue();
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state = onGlueHalf;
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break;
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case onBufferFull:
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switchToGlue();
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state = onGlueFull;
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break;
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case onGlueHalf:
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std::cout << "Wrong state on switchBuffer method - onGlueHalf, aborting" << std::endl;
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break;
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case onGlueFull:
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#if DEBUGGING
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std::cout << "Having another fragment " << pending[0].length << " bytes long" << std::endl;
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#endif
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switchBuffer(pending[0].ptr, pending[0].length);
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for (int i = 0; i < GLUE_LENGTH/2; ++i) {
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glue[i] = pending[0].ptr[pending[0].length - GLUE_LENGTH/2 + i];
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}
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state = onBufferHalf;
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if (pending.size() > 1) {
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for (int i = 0; i < GLUE_LENGTH/2; ++i) {
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glue[GLUE_LENGTH/2 + i] = pending[1].ptr[i];
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}
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state = onBufferFull;
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}
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}
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cached = false;
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}
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void Decoder::prepareNextBuffer()
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{
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bool shift;
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do {
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shift = false;
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framesLeft();
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if (cachedLength == 0 && state != empty && state != onGlueHalf) {
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pullBuffer();
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changeBuffer();
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shift = true;
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}
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} while (shift);
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}
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void Decoder::initializeProbe(mad_stream& probe)
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{
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mad_stream_init(&probe);
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probe.buffer = stream->buffer;
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probe.bufend = stream->bufend;
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probe.skiplen = stream->skiplen;
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//probe.sync = stream->sync;
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//probe.freerate = stream->freerate;
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//probe.this_frame = stream->this_frame;
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probe.next_frame = stream->next_frame;
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//probe.ptr.byte = stream->ptr.byte;
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//probe.ptr.cache = stream->ptr.cache;
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//probe.ptr.cache = stream->ptr.cache;
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//probe.anc_ptr.byte = stream->anc_ptr.byte;
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//probe.anc_ptr.cache = stream->anc_ptr.cache;
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//probe.anc_ptr.cache = stream->anc_ptr.cache;
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//probe.anc_bitlen = stream->anc_bitlen;
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//probe.main_data = stream.main_data;
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//probe.md_len = stream.md_len;
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//probe.options = stream->options;
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//probe.error = stream->error;
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}
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void Decoder::switchToGlue()
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{
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#if DEBUGGING
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std::cout << "Switching to glue" << std::endl;
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#endif
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switchBuffer(glue, GLUE_LENGTH);
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#if DEBUGGING
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std::cout << "Freeing the drained fragment" << std::endl;
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#endif
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delete[] pending[0].ptr;
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pending.pop_front();
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}
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void Decoder::switchBuffer(uint8_t* bufferPtr, uint32_t length)
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{
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uint32_t left;
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if (stream->error != MAD_ERROR_BUFLEN) {
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std::cout << "WARNING: Switching buffers while the previous one is not drained, last error: " << mad_stream_errorstr(stream) << std::endl;
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}
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if (stream->next_frame != NULL) {
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left = stream->bufend - stream->next_frame;
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} else {
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std::cout << "WARNING: not supposed to happen" << std::endl;
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}
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if (left > GLUE_LENGTH / 2) {
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std::cout << "Error: bytes to read in the buffer are more then glue buffer can fit (" << left << ")" << std::endl;
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throw 1;
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}
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mad_stream_buffer(stream, bufferPtr + GLUE_LENGTH / 2 - left, length - (GLUE_LENGTH / 2 - left));
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stream->error = MAD_ERROR_NONE;
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while (mad_header_decode(&frame->header, stream) != 0 && stream->error != MAD_ERROR_BUFLEN) {}
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}
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