mlc/flactomp3.cpp

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#include "flactomp3.h"
constexpr uint16_t flacBlockMaxSize = 4096;
static const std::string_view title ("TITLE=");
static const std::string_view artist ("ARTIST=");
static const std::string_view album ("ALBUM=");
static const std::string_view comment ("COMMENT=");
static const std::string_view genre ("GENRE=");
static const std::string_view track ("TRACKNUMBER=");
static const std::string_view date ("DATE=");
static const std::map<std::string, const std::string> knownTags {
{"ALBUMARTIST=", "TPE2="},
{"PUBLISHER=", "TPUB="},
{"LENGTH=", "TLEN="},
{"ISRC=", "TSRC="},
{"DISCNUMBER=", "TPOS="},
{"BPM=", "TBPM="}
};
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FLACtoMP3::FLACtoMP3(uint8_t size) :
inPath(),
outPath(),
decoder(FLAC__stream_decoder_new()),
encoder(lame_init()),
statusFLAC(),
output(nullptr),
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pcmCounter(0),
pcmSize(size * flacBlockMaxSize),
pcm(new int16_t[pcmSize * 2]),
outputBuffer(new uint8_t[pcmSize * 2]),
outputInitilized(false)
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{
}
FLACtoMP3::~FLACtoMP3() {
lame_close(encoder);
FLAC__stream_decoder_delete(decoder);
delete[] pcm;
delete[] outputBuffer;
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}
void FLACtoMP3::run() {
FLAC__bool ok = FLAC__stream_decoder_process_until_end_of_stream(decoder);
std::cout << "decoding: ";
if (ok) {
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std::cout << "succeeded";
flush();
int nwrite = lame_encode_flush(encoder, outputBuffer, pcmSize * 2);
fwrite((char*)outputBuffer ,nwrite, 1, output);
// // 7. Write INFO tag (OPTIONAL)
lame_mp3_tags_fid(encoder, output);
} else {
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std::cout << "FAILED";
}
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std::cout << std::endl;
std::cout << " state: " << FLAC__StreamDecoderStateString[FLAC__stream_decoder_get_state(decoder)] << std::endl;
if (outputInitilized) {
fclose(output);
output = nullptr;
}
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}
void FLACtoMP3::setInputFile(const std::string& path) {
if (inPath.size() > 0)
throw 1;
inPath = path;
FLAC__stream_decoder_set_md5_checking(decoder, true);
FLAC__stream_decoder_set_metadata_respond_all(decoder);
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statusFLAC = FLAC__stream_decoder_init_file(decoder, path.c_str(), write, metadata, error, this);
}
void FLACtoMP3::setOutputFile(const std::string& path) {
if (outPath.size() > 0)
throw 2;
outPath = path;
lame_set_VBR(encoder, vbr_default);
lame_set_VBR_quality(encoder, 0);
lame_set_quality(encoder, 0);
}
bool FLACtoMP3::initializeOutput() {
if (outputInitilized)
throw 5;
output = fopen(outPath.c_str(), "w+b");
if (output == 0) {
output = nullptr;
std::cout << "Error opening file " << outPath << std::endl;
return false;
}
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int ret = lame_init_params(encoder);
if (ret < 0) {
std::cout << "Error occurred during parameters initializing. Code = " << ret << std::endl;
fclose(output);
output = nullptr;
return false;
}
outputInitilized = true;
return true;
}
void FLACtoMP3::processInfo(const FLAC__StreamMetadata_StreamInfo& info) {
lame_set_in_samplerate(encoder, info.sample_rate);
lame_set_num_channels(encoder, info.channels);
}
void FLACtoMP3::processTags(const FLAC__StreamMetadata_VorbisComment& tags) {
for (FLAC__uint32 i = 0; i < tags.num_comments; ++i) {
const FLAC__StreamMetadata_VorbisComment_Entry& entry = tags.comments[i];
std::string_view comm((const char*)entry.entry);
if (comm.find(title) == 0) {
id3tag_set_title(encoder, comm.substr(title.size()).data());
} else if (comm.find(artist) == 0) {
id3tag_set_artist(encoder, comm.substr(artist.size()).data());
} else if (comm.find(album) == 0) {
id3tag_set_album(encoder, comm.substr(album.size()).data());
} else if (comm.find(comment) == 0) {
id3tag_set_comment(encoder, comm.substr(comment.size()).data());
} else if (comm.find(genre) == 0) {
id3tag_set_genre(encoder, comm.substr(genre.size()).data());
} else if (comm.find(track) == 0) {
id3tag_set_track(encoder, comm.substr(track.size()).data());
} else if (comm.find(date) == 0) {
std::string_view fullDate = comm.substr(date.size());
if (fullDate.size() == 10) {
std::string_view month = fullDate.substr(5, std::size_t(2));
std::string_view day = fullDate.substr(8);
std::string md = "TDAT=" + std::string(month) + std::string(day);
int res = id3tag_set_fieldvalue(encoder, md.c_str());
if (res != 0)
std::cout << "wasn't able to set the date tag (" << md << ")" << std::endl;
fullDate = fullDate.substr(0, 4); //year;
}
id3tag_set_year(encoder, std::string(fullDate).data());
} else if (!tryKnownTag(comm)) {
std::string tag = "TXXX=" + std::string(comm);
int res = id3tag_set_fieldvalue(encoder, tag.c_str());
if (res != 0)
std::cout << "wasn't able to set user tag (" << comm << ")" << std::endl;
}
}
}
bool FLACtoMP3::tryKnownTag(std::string_view source) {
for (const std::pair<const std::string, const std::string>& pair : knownTags) {
if (source.find(pair.first) == 0) {
std::string tag = pair.second + std::string(source.substr(pair.first.size()));
int res = id3tag_set_fieldvalue(encoder, tag.c_str());
if (res != 0)
std::cout << "wasn't able to set tag (" << source << ")" << std::endl;
return true;
}
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}
return false;
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}
bool FLACtoMP3::decodeFrame(const int32_t * const buffer[], uint32_t size) {
if (!outputInitilized) {
bool success = initializeOutput();
if (!success)
return false;
}
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for (size_t i = 0; i < size; ++i) {
pcm[2 * pcmCounter] = (int16_t)buffer[0][i];
pcm[2 * pcmCounter + 1] = (int16_t)buffer[1][i];
++pcmCounter;
}
if (pcmCounter == pcmSize)
return flush();
return true;
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}
bool FLACtoMP3::flush() {
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int nwrite = lame_encode_buffer_interleaved(
encoder,
pcm,
pcmCounter,
outputBuffer,
pcmSize * 2
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);
int actuallyWritten = fwrite((char*)outputBuffer, nwrite, 1, output);
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pcmCounter = 0;
return actuallyWritten == 1;
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}
void FLACtoMP3::metadata(const FLAC__StreamDecoder* decoder, const FLAC__StreamMetadata* metadata, void* client_data) {
(void)(decoder);
FLACtoMP3* self = static_cast<FLACtoMP3*>(client_data);
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switch (metadata->type) {
case FLAC__METADATA_TYPE_STREAMINFO:
self->processInfo(metadata->data.stream_info);
break;
case FLAC__METADATA_TYPE_VORBIS_COMMENT:
self->processTags(metadata->data.vorbis_comment);
break;
default:
break;
}
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}
FLAC__StreamDecoderWriteStatus FLACtoMP3::write(
const FLAC__StreamDecoder* decoder,
const FLAC__Frame* frame,
const FLAC__int32 * const buffer[],
void* client_data
) {
(void)(decoder);
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// if (decoded->totalSamples == 0) {
// std::cout << "ERROR: this example only works for FLAC files that have a total_samples count in STREAMINFO" << std::endl;
// return FLAC__STREAM_DECODER_WRITE_STATUS_ABORT;
// }
// if (decoded->channels != 2 || decoded->depth != 16) {
// std::cout << "ERROR: this example only supports 16bit stereo streams" << std::endl;
// return FLAC__STREAM_DECODER_WRITE_STATUS_ABORT;
// }
if (frame->header.channels != 2) {
std::cout << "ERROR: This frame contains " << frame->header.channels << " channels (should be 2)" << std::endl;
return FLAC__STREAM_DECODER_WRITE_STATUS_ABORT;
}
if (buffer[0] == NULL) {
std::cout << "ERROR: buffer [0] is NULL" << std::endl;
return FLAC__STREAM_DECODER_WRITE_STATUS_ABORT;
}
if (buffer[1] == NULL) {
std::cout << "ERROR: buffer [1] is NULL" << std::endl;
return FLAC__STREAM_DECODER_WRITE_STATUS_ABORT;
}
FLACtoMP3* self = static_cast<FLACtoMP3*>(client_data);
bool result = self->decodeFrame(buffer, frame->header.blocksize);
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if (result)
return FLAC__STREAM_DECODER_WRITE_STATUS_CONTINUE;
else
return FLAC__STREAM_DECODER_WRITE_STATUS_ABORT;
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}
void FLACtoMP3::error(const FLAC__StreamDecoder* decoder, FLAC__StreamDecoderErrorStatus status, void* client_data) {
(void)decoder, (void)client_data;
std::cout << "Got error callback: " << FLAC__StreamDecoderErrorStatusString[status] << std::endl;
}