int
FLACInputStream::doRead(int frame_count, void* samples) {
const int frame_size = m_channel_count * GetSampleSize(m_sample_format);
u8* out = (u8*)samples;
// we keep reading till we finish topping up!
int frames_read = 0;
while (frames_read < frame_count) {
// if the buffer is empty, ask FLAC to fill it p
if (m_buffer.getSize() < frame_size) {
if (!FLAC__seekable_stream_decoder_process_single(m_decoder)) {
return frames_read;
}
// if the buffer still has a size of 0, we are probably at the
// end of the stream
if (m_buffer.getSize() < frame_size) {
return frames_read;
}
}
// read what we've got!
const int to_read = std::min(
frame_count - frames_read,
m_buffer.getSize() / frame_size);
m_buffer.read(out, to_read * frame_size);
out += to_read * frame_size;
frames_read += to_read;
}
return frames_read;
}
void READMORE(void)
{
if (!FLAC__seekable_stream_decoder_process_single(decoder))
{
fprintf(stderr, "FLAC__seekable_stream_decoder_process_single() failed?\n");
return;
}
if (FLAC__seekable_stream_decoder_get_state(decoder)==FLAC__STREAM_DECODER_READ_STATUS_END_OF_STREAM)
{
fprintf(stderr, "EOF\n");
return;
}
}
FLAC__bool FLAC__file_decoder_process_single(FLAC__FileDecoder *decoder)
{
FLAC__bool ret;
FLAC__ASSERT(0 != decoder);
if(decoder->private_->seekable_stream_decoder->protected_->state == FLAC__SEEKABLE_STREAM_DECODER_END_OF_STREAM)
decoder->protected_->state = FLAC__FILE_DECODER_END_OF_FILE;
if(decoder->protected_->state == FLAC__FILE_DECODER_END_OF_FILE)
return true;
FLAC__ASSERT(decoder->protected_->state == FLAC__FILE_DECODER_OK);
ret = FLAC__seekable_stream_decoder_process_single(decoder->private_->seekable_stream_decoder);
if(!ret)
decoder->protected_->state = FLAC__FILE_DECODER_SEEKABLE_STREAM_DECODER_ERROR;
return ret;
}
bool
FLACInputStream::initialize(FilePtr file) {
m_file = file;
// initialize the decoder
m_decoder = FLAC__seekable_stream_decoder_new();
if (!m_decoder) {
m_file = 0;
return false;
}
#define SET_CALLBACK(name) \
FLAC__seekable_stream_decoder_set_##name##_callback( \
m_decoder, \
name##_callback)
// set callbacks
FLAC__seekable_stream_decoder_set_client_data (m_decoder, this);
SET_CALLBACK(read);
SET_CALLBACK(seek);
SET_CALLBACK(tell);
SET_CALLBACK(length);
SET_CALLBACK(eof);
SET_CALLBACK(write);
SET_CALLBACK(metadata);
SET_CALLBACK(error);
FLAC__SeekableStreamDecoderState state =
FLAC__seekable_stream_decoder_init(m_decoder);
if (state != FLAC__SEEKABLE_STREAM_DECODER_OK) {
FLAC__seekable_stream_decoder_finish(m_decoder);
FLAC__seekable_stream_decoder_delete(m_decoder);
m_decoder = 0;
m_file = 0;
return false;
}
// make sure we have metadata before we return!
if (!FLAC__seekable_stream_decoder_process_until_end_of_metadata(m_decoder)) {
FLAC__seekable_stream_decoder_finish(m_decoder);
FLAC__seekable_stream_decoder_delete(m_decoder);
m_decoder = 0;
m_file = 0;
return false;
}
// process one frame so we can do something!
if (!FLAC__seekable_stream_decoder_process_single(m_decoder)) {
FLAC__seekable_stream_decoder_finish(m_decoder);
FLAC__seekable_stream_decoder_delete(m_decoder);
m_decoder = 0;
m_file = 0;
return false;
}
// get info about the flac file
m_channel_count = FLAC__seekable_stream_decoder_get_channels(m_decoder);
m_sample_rate = FLAC__seekable_stream_decoder_get_sample_rate(m_decoder);
int bps = FLAC__seekable_stream_decoder_get_bits_per_sample(m_decoder);
if (bps == 16) {
m_sample_format = SF_S16;
} else if (bps == 8) {
m_sample_format = SF_U8;
} else {
return false;
}
return true;
}
/* this is the codec entry point */
enum codec_status codec_start(struct codec_api* api)
{
struct codec_api* ci = api;
FLAC__SeekableStreamDecoder* flacDecoder;
FLAC__uint64 offset;
TEST_CODEC_API(ci);
#ifndef SIMULATOR
ci->memcpy(iramstart, iramcopy, iramend-iramstart);
#endif
ci->configure(CODEC_SET_FILEBUF_LIMIT, (int *)(1024*1024*10));
ci->configure(CODEC_SET_FILEBUF_WATERMARK, (int *)(1024*512));
ci->configure(CODEC_SET_FILEBUF_CHUNKSIZE, (int *)(1024*1024));
ci->configure(CODEC_DSP_ENABLE, (bool *)true);
ci->configure(DSP_DITHER, (bool *)false);
ci->configure(DSP_SET_STEREO_MODE, (int *)STEREO_INTERLEAVED);
ci->configure(DSP_SET_SAMPLE_DEPTH, (int *)(16));
next_track:
metadata_length = 0;
seek_table = NULL;
stream_info = NULL;
if (codec_init(api)) {
return CODEC_ERROR;
}
while (!ci->taginfo_ready)
ci->yield();
ci->configure(DSP_SET_FREQUENCY, (long *)(ci->id3->frequency));
codec_set_replaygain(ci->id3);
/* Create a decoder instance */
flacDecoder = FLAC__seekable_stream_decoder_new();
/* Set up the decoder and the callback functions - this must be done before init */
/* The following are required for stream_decoder and higher */
FLAC__seekable_stream_decoder_set_client_data(flacDecoder,ci);
FLAC__seekable_stream_decoder_set_write_callback(flacDecoder, flac_write_handler);
FLAC__seekable_stream_decoder_set_read_callback(flacDecoder, flac_read_handler);
FLAC__seekable_stream_decoder_set_metadata_callback(flacDecoder, flac_metadata_handler);
FLAC__seekable_stream_decoder_set_error_callback(flacDecoder, flac_error_handler);
FLAC__seekable_stream_decoder_set_metadata_respond_all(flacDecoder);
/* The following are only for the seekable_stream_decoder */
FLAC__seekable_stream_decoder_set_seek_callback(flacDecoder, flac_seek_handler);
FLAC__seekable_stream_decoder_set_tell_callback(flacDecoder, flac_tell_handler);
FLAC__seekable_stream_decoder_set_length_callback(flacDecoder, flac_length_handler);
FLAC__seekable_stream_decoder_set_eof_callback(flacDecoder, flac_eof_handler);
/* QUESTION: What do we do when the init fails? */
if (FLAC__seekable_stream_decoder_init(flacDecoder)) {
return CODEC_ERROR;
}
/* The first thing to do is to parse the metadata */
FLAC__seekable_stream_decoder_process_until_end_of_metadata(flacDecoder);
if (ci->id3->offset && stream_info) {
FLAC__uint64 sample;
sample = find_sample_number(ci, ci->id3->offset - metadata_length);
ci->advance_buffer(ci->id3->offset);
FLAC__seekable_stream_decoder_seek_absolute(flacDecoder, sample);
FLAC__seekable_stream_decoder_get_decode_position(flacDecoder, &offset);
ci->set_offset(offset);
samplesdone = (uint32_t)sample;
ci->set_elapsed(sample/(ci->id3->frequency/1000));
} else {
samplesdone = 0;
ci->set_elapsed(0);
}
/* The main decoder loop */
while (FLAC__seekable_stream_decoder_get_state(flacDecoder) != FLAC__SEEKABLE_STREAM_DECODER_END_OF_STREAM) {
ci->yield();
if (ci->stop_codec || ci->reload_codec) {
break;
}
if (ci->seek_time) {
int sample_loc;
sample_loc = ci->seek_time/1000 * ci->id3->frequency;
if (FLAC__seekable_stream_decoder_seek_absolute(flacDecoder, sample_loc)) {
samplesdone = sample_loc;
ci->set_elapsed(samplesdone/(ci->id3->frequency/1000));
}
ci->seek_time = 0;
}
FLAC__seekable_stream_decoder_process_single(flacDecoder);
FLAC__seekable_stream_decoder_get_decode_position(flacDecoder, &offset);
ci->set_offset(offset);
}
/* Flush the libFLAC buffers */
FLAC__seekable_stream_decoder_finish(flacDecoder);
if (ci->request_next_track()) {
if (stream_info) {
FLAC__metadata_object_delete(stream_info);
}
if (seek_table) {
FLAC__metadata_object_delete(seek_table);
}
metadata_length = 0;
goto next_track;
}
return CODEC_OK;
}
int main(int argc, char *argv[])
{
if (argc!=2)
{
fprintf(stderr, "usage: %s flacfile\n", argv[0]);
return -1;
}
myfile = fopen(argv[1], "ro");
if (!myfile)
{
perror("fopen()");
return -1;
}
decoder = FLAC__seekable_stream_decoder_new();
if (!decoder)
{
fprintf(stderr, "FLAC__seekable_stream_decoder_new() failed, out of memory?\n");
return 1;
}
FLAC__seekable_stream_decoder_set_md5_checking(decoder, 0);
FLAC__seekable_stream_decoder_set_read_callback(decoder, read_callback);
FLAC__seekable_stream_decoder_set_write_callback(decoder, write_callback);
FLAC__seekable_stream_decoder_set_metadata_callback(decoder, metadata_callback);
FLAC__seekable_stream_decoder_set_seek_callback(decoder, seek_callback);
FLAC__seekable_stream_decoder_set_tell_callback(decoder, tell_callback);
FLAC__seekable_stream_decoder_set_length_callback(decoder, length_callback);
FLAC__seekable_stream_decoder_set_eof_callback(decoder, eof_callback);
FLAC__seekable_stream_decoder_set_client_data(decoder, myvar);
FLAC__seekable_stream_decoder_set_error_callback(decoder, error_callback);
switch (FLAC__seekable_stream_decoder_init(decoder))
{
case FLAC__SEEKABLE_STREAM_DECODER_OK:
fprintf(stderr, "init ok\n");
break;
case FLAC__SEEKABLE_STREAM_DECODER_SEEKING:
fprintf(stderr, "seeking\n");
break;
case FLAC__SEEKABLE_STREAM_DECODER_END_OF_STREAM:
fprintf(stderr, "eof\n");
break;
case FLAC__SEEKABLE_STREAM_DECODER_MEMORY_ALLOCATION_ERROR:
fprintf(stderr, "malloc failed\n");
break;
case FLAC__SEEKABLE_STREAM_DECODER_STREAM_DECODER_ERROR:
fprintf(stderr, "decoder error\n");
break;
case FLAC__SEEKABLE_STREAM_DECODER_READ_ERROR:
fprintf(stderr, "read error\n");
break;
case FLAC__SEEKABLE_STREAM_DECODER_SEEK_ERROR:
fprintf(stderr, "seek error\n");
break;
case FLAC__SEEKABLE_STREAM_DECODER_ALREADY_INITIALIZED:
fprintf(stderr, "already init'ed\n");
break;
case FLAC__SEEKABLE_STREAM_DECODER_INVALID_CALLBACK:
fprintf(stderr, "invalid callback\n");
break;
case FLAC__SEEKABLE_STREAM_DECODER_UNINITIALIZED:
fprintf(stderr, "decoder uninted\n");
break;
default:
fprintf(stderr, "init not ok\n");
break;
}
FLAC__seekable_stream_decoder_process_until_end_of_metadata(decoder);
FLAC__seekable_stream_decoder_process_single(decoder);
fprintf(stderr, "channels=%d\n", FLAC__seekable_stream_decoder_get_channels(decoder));
fprintf(stderr, "bits per sample=%d\n", FLAC__seekable_stream_decoder_get_bits_per_sample(decoder));
/*
fprintf(stderr, "position=%d\n", FLAC__seekable_stream_decoder_get_decode_position(decoder));
*/
FLAC__seekable_stream_decoder_finish(decoder);
FLAC__seekable_stream_decoder_delete(decoder);
fclose(myfile);
return 0;
}
int FlacPcm::processData(MediaInfo *infos, ChunkList *chunk_list, bool *killswitch)
{
reader = infos->getReader();
if(reader == 0)
return 0;
if(decoder == 0) {
decoder = FLAC__seekable_stream_decoder_new();
if(decoder == 0)
return 0;
FLAC__seekable_stream_decoder_set_md5_checking(decoder, false);
FLAC__seekable_stream_decoder_set_read_callback(decoder, readCallback_);
FLAC__seekable_stream_decoder_set_seek_callback(decoder, seekCallback_);
FLAC__seekable_stream_decoder_set_tell_callback(decoder, tellCallback_);
FLAC__seekable_stream_decoder_set_length_callback(decoder, lengthCallback_);
FLAC__seekable_stream_decoder_set_eof_callback(decoder, eofCallback_);
FLAC__seekable_stream_decoder_set_write_callback(decoder, writeCallback_);
FLAC__seekable_stream_decoder_set_metadata_callback(decoder, metadataCallback_);
FLAC__seekable_stream_decoder_set_error_callback(decoder, errorCallback_);
FLAC__seekable_stream_decoder_set_client_data(decoder, this);
if(FLAC__seekable_stream_decoder_init(decoder) != FLAC__SEEKABLE_STREAM_DECODER_OK) {
cleanup();
return 0;
}
if(!FLAC__seekable_stream_decoder_process_until_end_of_metadata(decoder)) {
cleanup();
return 0;
}
}
if(needs_seek) {
FLAC__seekable_stream_decoder_seek_absolute(decoder, seek_sample);
needs_seek = false;
}
bool eof = false;
while(samples_in_reservoir < 576) {
if(FLAC__seekable_stream_decoder_get_state(decoder) == FLAC__SEEKABLE_STREAM_DECODER_END_OF_STREAM) {
eof = true;
break;
}
else if(!FLAC__seekable_stream_decoder_process_single(decoder)) {
//@@@ how to do this? MessageBox(mod_.hMainWindow, FLAC__FileDecoderStateString[FLAC__file_decoder_get_state(decoder_)], "READ ERROR processing frame", 0);
eof = true;
break;
}
}
if(samples_in_reservoir == 0) {
eof = true;
}
else {
const unsigned channels = streaminfo.data.stream_info.channels;
const unsigned bits_per_sample = streaminfo.data.stream_info.bits_per_sample;
const unsigned bytes_per_sample = (bits_per_sample+7)/8;
const unsigned sample_rate = streaminfo.data.stream_info.sample_rate;
unsigned i, n = min(samples_in_reservoir, 576), delta;
signed short *ssbuffer = (signed short*)output;
for(i = 0; i < n*channels; i++)
ssbuffer[i] = reservoir[i];
delta = i;
for( ; i < samples_in_reservoir*channels; i++)
reservoir[i-delta] = reservoir[i];
samples_in_reservoir -= n;
const int bytes = n * channels * bytes_per_sample;
ChunkInfosI *ci=new ChunkInfosI();
ci->addInfo("srate", sample_rate);
ci->addInfo("bps", bits_per_sample);
ci->addInfo("nch", channels);
chunk_list->setChunk("PCM", output, bytes, ci);
}
if(eof)
return 0;
return 1;
}
