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133 lines
4.5 KiB
C++
133 lines
4.5 KiB
C++
#include "flacEncoder.h"
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#include <iostream>
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using namespace std;
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FlacEncoder::FlacEncoder(const msg::SampleFormat& format) : Encoder(format)
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{
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headerChunk = new HeaderMessage("flac");
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}
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double FlacEncoder::encode(msg::PcmChunk* chunk)
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{
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return chunk->duration<chronos::msec>().count();
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}
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#define READSIZE 1024
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static unsigned total_samples = 0; /* can use a 32-bit number due to WAVE size limitations */
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static FLAC__byte buffer[READSIZE/*samples*/ * 2/*bytes_per_sample*/ * 2/*channels*/]; /* we read the WAVE data into here */
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static FLAC__int32 pcm[READSIZE/*samples*/ * 2/*channels*/];
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static void write_callback(const FLAC__StreamEncoder *encoder, const unsigned char*, long unsigned int bytes, unsigned int samples, unsigned int current_frame, void *client_data)
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{
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cout << "write_callback: " << bytes << ", " << samples << ", " << current_frame << "\n";
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}
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void FlacEncoder::initEncoder()
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{
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FLAC__bool ok = true;
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FLAC__StreamEncoder *encoder = 0;
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FLAC__StreamEncoderInitStatus init_status;
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FLAC__StreamMetadata *metadata[2];
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FLAC__StreamMetadata_VorbisComment_Entry entry;
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// allocate the encoder
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if((encoder = FLAC__stream_encoder_new()) == NULL) {
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fprintf(stderr, "ERROR: allocating encoder\n");
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return;
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}
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ok &= FLAC__stream_encoder_set_verify(encoder, true);
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ok &= FLAC__stream_encoder_set_compression_level(encoder, 5);
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ok &= FLAC__stream_encoder_set_channels(encoder, sampleFormat.channels);
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ok &= FLAC__stream_encoder_set_bits_per_sample(encoder, sampleFormat.bits);
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ok &= FLAC__stream_encoder_set_sample_rate(encoder, sampleFormat.rate);
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ok &= FLAC__stream_encoder_set_total_samples_estimate(encoder, 0);
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// now add some metadata; we'll add some tags and a padding block
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if(ok) {
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if(
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(metadata[0] = FLAC__metadata_object_new(FLAC__METADATA_TYPE_VORBIS_COMMENT)) == NULL ||
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(metadata[1] = FLAC__metadata_object_new(FLAC__METADATA_TYPE_PADDING)) == NULL ||
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// there are many tag (vorbiscomment) functions but these are convenient for this particular use:
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!FLAC__metadata_object_vorbiscomment_entry_from_name_value_pair(&entry, "ARTIST", "Some Artist") ||
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!FLAC__metadata_object_vorbiscomment_append_comment(metadata[0], entry, false) ||
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!FLAC__metadata_object_vorbiscomment_entry_from_name_value_pair(&entry, "YEAR", "1984") ||
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!FLAC__metadata_object_vorbiscomment_append_comment(metadata[0], entry, false)
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) {
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fprintf(stderr, "ERROR: out of memory or tag error\n");
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ok = false;
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}
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metadata[1]->length = 1234; // set the padding length
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ok = FLAC__stream_encoder_set_metadata(encoder, metadata, 2);
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}
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// initialize encoder
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if(ok) {
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init_status = FLAC__stream_encoder_init_stream(encoder, write_callback, NULL, NULL, NULL, NULL);
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if(init_status != FLAC__STREAM_ENCODER_INIT_STATUS_OK) {
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fprintf(stderr, "ERROR: initializing encoder: %s\n", FLAC__StreamEncoderInitStatusString[init_status]);
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ok = false;
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}
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}
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/*
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// read blocks of samples from WAVE file and feed to encoder
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if(ok) {
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size_t left = (size_t)total_samples;
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while(ok && left) {
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size_t need = (left>READSIZE? (size_t)READSIZE : (size_t)left);
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if(fread(buffer, channels*(bps/8), need, fin) != need) {
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fprintf(stderr, "ERROR: reading from WAVE file\n");
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ok = false;
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}
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else {
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// convert the packed little-endian 16-bit PCM samples from WAVE into an interleaved FLAC__int32 buffer for libFLAC
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size_t i;
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for(i = 0; i < need*channels; i++) {
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// inefficient but simple and works on big- or little-endian machines
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pcm[i] = (FLAC__int32)(((FLAC__int16)(FLAC__int8)buffer[2*i+1] << 8) | (FLAC__int16)buffer[2*i]);
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}
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// feed samples to encoder
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ok = FLAC__stream_encoder_process_interleaved(encoder, pcm, need);
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}
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left -= need;
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}
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}
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ok &= FLAC__stream_encoder_finish(encoder);
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fprintf(stderr, "encoding: %s\n", ok? "succeeded" : "FAILED");
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fprintf(stderr, " state: %s\n", FLAC__StreamEncoderStateString[FLAC__stream_encoder_get_state(encoder)]);
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// now that encoding is finished, the metadata can be freed
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FLAC__metadata_object_delete(metadata[0]);
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FLAC__metadata_object_delete(metadata[1]);
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FLAC__stream_encoder_delete(encoder);
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fclose(fin);
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return 0;
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*/
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}
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void progress_callback(const FLAC__StreamEncoder *encoder, FLAC__uint64 bytes_written, FLAC__uint64 samples_written, unsigned frames_written, unsigned total_frames_estimate, void *client_data)
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{
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(void)encoder, (void)client_data;
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fprintf(stderr, "wrote %d bytes, %d, %u samples, %u/%u frames\n", bytes_written, samples_written, total_samples, frames_written, total_frames_estimate);
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}
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