blue/jsmad
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still no good, but a bit cleaned up

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Blue 2019-01-14 17:50:41 +03:00
parent 1f40231b9b
commit db0b829fbd
3 changed files with 41 additions and 80 deletions
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113
decoder.cpp
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@ -8,7 +8,9 @@ channels(0),
cachedLength(0),
samplesPerFrame(0),
glue(new uint8_t[GLUE_LENGTH]),
lastSync(-1),
cachedNext(NULL),
cachedThis(NULL),
cachedError(MAD_ERROR_NONE),
cached(false),
synth(),
stream(),
@ -107,7 +109,6 @@ emscripten::val Decoder::decode(uint32_t count)
int res = mad_frame_decode(&frame, &stream);
if (res == 0) {
lastSync = stream.bufend - stream.this_frame;
++success;
} else {
if (MAD_RECOVERABLE(stream.error)) {
@ -153,7 +154,6 @@ bool Decoder::hasMore() const
uint32_t Decoder::framesLeft(uint32_t max)
{
if (state == empty || state == onGlueHalf) {
cached = true;
return 0;
}
@ -178,13 +178,16 @@ uint32_t Decoder::framesLeft(uint32_t max)
++cachedLength;
}
} else {
std::cout << "framesLeft::" << mad_stream_errorstr(&probe) << std::endl;
std::cout << "framesLeft error: " << mad_stream_errorstr(&probe) << std::endl;
if (!MAD_RECOVERABLE(probe.error)) {
break;
}
}
}
cachedNext = probe.next_frame;
cachedThis = probe.this_frame;
cachedError = probe.error;
mad_header_finish(&ph);
mad_stream_finish(&probe);
std::cout << cachedLength << " frames are available for decoding" << std::endl;
@ -196,13 +199,12 @@ uint32_t Decoder::framesLeft(uint32_t max)
void Decoder::pullBuffer()
{
mad_header dummy;
mad_header_init(&dummy);
while(stream.error == 0 || MAD_RECOVERABLE(stream.error)) {
mad_header_decode(&dummy, &stream);
std::cout << "pullBuffer:: " << mad_stream_errorstr(&stream) << std::endl;
if (cached == false) {
std::cout << "Error in pullBuffer method!" << std::endl;
}
mad_header_finish(&dummy);
stream.this_frame = cachedThis;
stream.next_frame = cachedNext;
stream.error = cachedError;
}
void Decoder::changeBuffer()
@ -224,39 +226,8 @@ void Decoder::changeBuffer()
break;
case onGlueFull:
std::cout << "Having another fragment " << pending[0].length << " bytes long" << std::endl;
left = (uint64_t)stream.bufend - (uint64_t)stream.next_frame;
// std::cout << "MD_LENGTH_BEFORE: " << stream.anc_bitlen << std::endl;
mad_stream_buffer(&stream, pending[0].ptr, pending[0].length);
//mad_stream_skip(&stream, left);
stream.error = MAD_ERROR_NONE;
if (lastSync != -1) {
if (lastSync > GLUE_LENGTH / 2) {
std::cout << "Error: bytes to read in the buffer are more then glue buffer can fit LASTSYNC (" << lastSync << ")" << std::endl;
throw 1;
}
uint64_t target = (uint64_t)stream.buffer + GLUE_LENGTH / 2 - lastSync;
while ((uint64_t)(stream.this_frame) < target) {
// std::cout << "pulling" << std::endl;
mad_frame_decode(&frame, &stream);
}
stream.error = MAD_ERROR_NONE;
// stream.this_frame = stream.buffer + GLUE_LENGTH / 2 - lastSync;
// stream.next_frame = stream.buffer + GLUE_LENGTH / 2 - left;
// stream.sync = 1;
lastSync = -1;
// mad_bitptr next_frame;
// mad_bit_init(&next_frame, stream.next_frame);
// stream.anc_ptr = stream.ptr;
// stream.anc_bitlen = mad_bit_length(&stream.ptr, &next_frame);
// mad_bit_finish(&next_frame);
//
// std::cout << ", MD_LENGTH_AFTER: " << stream.anc_bitlen << std::endl;
}
switchBuffer(pending[0].ptr, pending[0].length);
for (int i = 0; i < GLUE_LENGTH/2; ++i) {
glue[i] = pending[0].ptr[pending[0].length - GLUE_LENGTH/2 + i];
@ -317,46 +288,32 @@ void Decoder::initializeProbe(mad_stream& probe)
void Decoder::switchToGlue()
{
std::cout << "Switching to glue" << std::endl;
uint32_t left = (uint64_t)stream.bufend - (uint64_t)stream.next_frame;
if (left > GLUE_LENGTH / 2) {
std::cout << "Error: bytes to read in the buffer are more then glue buffer can fit (" << left << ")" << std::endl;
throw 1;
}
// std::cout << "MD_LENGTH_BEFORE: " << stream.anc_bitlen << std::endl;
mad_stream_buffer(&stream, glue, GLUE_LENGTH);
if (lastSync != -1) {
if (lastSync > GLUE_LENGTH / 2) {
std::cout << "Error: bytes to read in the buffer are more then glue buffer can fit LASTSYNC (" << lastSync << ")" << std::endl;
throw 1;
}
uint64_t target = (uint64_t)stream.bufend - GLUE_LENGTH / 2 - lastSync;
while ((uint64_t)(stream.this_frame) < target) {
// std::cout << "pulling" << std::endl;
mad_frame_decode(&frame, &stream);
}
stream.error = MAD_ERROR_NONE;
// stream.this_frame = stream.bufend - GLUE_LENGTH / 2 - lastSync;
// stream.next_frame = stream.bufend - GLUE_LENGTH / 2 - left;
// stream.sync = 1;
// mad_bitptr next_frame;
// mad_bit_init(&next_frame, stream.next_frame);
// stream.anc_ptr = stream.ptr;
// stream.anc_bitlen = mad_bit_length(&stream.ptr, &next_frame);
// mad_bit_finish(&next_frame);
//
// std::cout << ", MD_LENGTH_AFTER: " << stream.anc_bitlen << std::endl;
lastSync = -1;
}
//mad_stream_skip(&stream, left);
switchBuffer(glue, GLUE_LENGTH);
stream.error = MAD_ERROR_NONE;
//std::cout << "SKIPLEN (" << stream.skiplen << ")" << std::endl;
std::cout << "Freeing the drained fragment" << std::endl;
free(pending[0].ptr);
pending.pop_front();
}
void Decoder::switchBuffer(uint8_t* bufferPtr, uint32_t length)
{
uint32_t left;
if (stream.error != MAD_ERROR_BUFLEN) {
std::cout << "WARNING: Switching buffers while the previous one is not drained, error: " << mad_stream_errorstr(&stream) << std::endl;
}
if (stream.next_frame != NULL) {
left = stream.bufend - stream.next_frame;
} else {
std::cout << "WARNING: not supposed to happen" << std::endl;
}
if (left > GLUE_LENGTH / 2) {
std::cout << "Error: bytes to read in the buffer are more then glue buffer can fit (" << left << ")" << std::endl;
throw 1;
}
mad_stream_buffer(&stream, bufferPtr + GLUE_LENGTH / 2 - left, length - (GLUE_LENGTH / 2 - left));
stream.error = MAD_ERROR_NONE;
}

5
decoder.h
View File

@ -45,7 +45,9 @@ private:
uint32_t cachedLength;
uint16_t samplesPerFrame;
uint8_t* glue;
int32_t lastSync;
uint8_t const* cachedNext;
uint8_t const* cachedThis;
mad_error cachedError;
bool cached;
mad_synth synth;
@ -61,6 +63,7 @@ private:
void prepareNextBuffer();
void initializeProbe(mad_stream& probe);
void switchToGlue();
void switchBuffer(uint8_t* bufferPtr, uint32_t length);
};
#endif // DECODER_H

3
index.html
View File

@ -30,7 +30,8 @@
createFileFragments(reader.result);
scheduleData();
ctx.resume();
setTimeout(.bind(ctx), 1000);
}
reader.readAsArrayBuffer(file);