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a bit better undertanding of how it works, tags copy

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This commit is contained in:
Blue 2023-07-17 18:29:59 -03:00
parent 7cea7ed30b
commit e34c7f4fba
Signed by: blue
GPG Key ID: 9B203B252A63EE38
2 changed files with 162 additions and 44 deletions
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184
flactomp3.cpp
View File

@ -2,17 +2,35 @@
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="}
};
FLACtoMP3::FLACtoMP3(uint8_t size) :
inPath(),
outPath(),
decoder(FLAC__stream_decoder_new()),
encoder(lame_init()),
statusFLAC(),
output(),
output(nullptr),
pcmCounter(0),
pcmSize(size * flacBlockMaxSize),
pcm(new int16_t[pcmSize * 2]),
mp3(new uint8_t[pcmSize])
outputBuffer(new uint8_t[pcmSize * 2]),
outputInitilized(false)
{
}
@ -20,27 +38,33 @@ FLACtoMP3::~FLACtoMP3() {
lame_close(encoder);
FLAC__stream_decoder_delete(decoder);
delete[] pcm;
delete[] mp3;
delete[] outputBuffer;
}
void FLACtoMP3::run() {
FLAC__bool ok = FLAC__stream_decoder_process_until_end_of_stream(decoder);
std::cout << "decoding: ";
if (ok)
if (ok) {
std::cout << "succeeded";
else
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 {
std::cout << "FAILED";
}
std::cout << std::endl;
std::cout << " state: " << FLAC__StreamDecoderStateString[FLAC__stream_decoder_get_state(decoder)] << std::endl;
flush();
int nwrite = lame_encode_flush(encoder, mp3, pcmSize);
output.write((char*)mp3, nwrite);
// // 7. Write INFO tag (OPTIONAL)
// // lame_mp3_tags_fid(lame, mp3);
output.close();
if (outputInitilized) {
fclose(output);
output = nullptr;
}
}
void FLACtoMP3::setInputFile(const std::string& path) {
@ -50,6 +74,7 @@ void FLACtoMP3::setInputFile(const std::string& path) {
inPath = path;
FLAC__stream_decoder_set_md5_checking(decoder, true);
FLAC__stream_decoder_set_metadata_respond_all(decoder);
statusFLAC = FLAC__stream_decoder_init_file(decoder, path.c_str(), write, metadata, error, this);
}
@ -59,22 +84,100 @@ void FLACtoMP3::setOutputFile(const std::string& path) {
outPath = path;
// 3. Do some settings (OPTIONAL)
lame_set_in_samplerate(encoder, 44100);
lame_set_VBR(encoder, vbr_default);
lame_set_VBR_quality(encoder, 2);
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;
}
// 4. Initialize parameters
int ret = lame_init_params(encoder);
if (ret < 0) {
std::cout << "Error occurred during parameters initializing. Code = " << ret << std::endl;
throw 3;
fclose(output);
output = nullptr;
return false;
}
output.open(path, std::ios::out | std::ios::binary);
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;
}
}
return false;
}
bool FLACtoMP3::decodeFrame(const int32_t * const buffer[], uint32_t size) {
if (!outputInitilized) {
bool success = initializeOutput();
if (!success)
return false;
}
void FLACtoMP3::decodeFrame(const int32_t * const buffer[], uint32_t size) {
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];
@ -82,23 +185,38 @@ void FLACtoMP3::decodeFrame(const int32_t * const buffer[], uint32_t size) {
}
if (pcmCounter == pcmSize)
flush();
return flush();
return true;
}
void FLACtoMP3::flush() {
bool FLACtoMP3::flush() {
int nwrite = lame_encode_buffer_interleaved(
encoder,
pcm,
pcmCounter,
mp3,
pcmSize
outputBuffer,
pcmSize * 2
);
output.write((char*)mp3, nwrite);
int actuallyWritten = fwrite((char*)outputBuffer, nwrite, 1, output);
pcmCounter = 0;
return actuallyWritten == 1;
}
void FLACtoMP3::metadata(const FLAC__StreamDecoder* decoder, const FLAC__StreamMetadata* metadata, void* client_data) {
(void)(decoder);
FLACtoMP3* self = static_cast<FLACtoMP3*>(client_data);
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;
}
}
FLAC__StreamDecoderWriteStatus FLACtoMP3::write(
@ -107,9 +225,7 @@ FLAC__StreamDecoderWriteStatus FLACtoMP3::write(
const FLAC__int32 * const buffer[],
void* client_data
) {
FLACtoMP3* self = static_cast<FLACtoMP3*>(client_data);
self->decodeFrame(buffer, frame->header.blocksize);
(void)(decoder);
// 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;
@ -131,17 +247,13 @@ FLAC__StreamDecoderWriteStatus FLACtoMP3::write(
return FLAC__STREAM_DECODER_WRITE_STATUS_ABORT;
}
// /* write WAVE header before we write the first frame */
// if (frame->header.number.sample_number == 0)
// decoded->writeWaveHeader();
//
// /* write decoded PCM samples */
// for (size_t i = 0; i < frame->header.blocksize; i++) {
// decoded->write((uint16_t)buffer[0][i]);
// decoded->write((uint16_t)buffer[1][i]);
// }
FLACtoMP3* self = static_cast<FLACtoMP3*>(client_data);
bool result = self->decodeFrame(buffer, frame->header.blocksize);
if (result)
return FLAC__STREAM_DECODER_WRITE_STATUS_CONTINUE;
else
return FLAC__STREAM_DECODER_WRITE_STATUS_ABORT;
}
void FLACtoMP3::error(const FLAC__StreamDecoder* decoder, FLAC__StreamDecoderErrorStatus status, void* client_data) {

18
flactomp3.h
View File

@ -4,9 +4,10 @@
#include <lame/lame.h>
#include <string>
#include <string_view>
#include <iostream>
#include <ios>
#include <fstream>
#include <map>
#include <stdio.h>
class FLACtoMP3 {
public:
@ -18,8 +19,12 @@ public:
void run();
private:
void decodeFrame(const int32_t * const buffer[], uint32_t size);
void flush();
void processTags(const FLAC__StreamMetadata_VorbisComment& tags);
void processInfo(const FLAC__StreamMetadata_StreamInfo& info);
bool decodeFrame(const int32_t * const buffer[], uint32_t size);
bool flush();
bool initializeOutput();
bool tryKnownTag(std::string_view source);
static void error(const FLAC__StreamDecoder *decoder, FLAC__StreamDecoderErrorStatus status, void *client_data);
static void metadata(const FLAC__StreamDecoder *decoder, const FLAC__StreamMetadata *metadata, void *client_data);
@ -38,9 +43,10 @@ private:
lame_t encoder;
FLAC__StreamDecoderInitStatus statusFLAC;
std::ofstream output;
FILE* output;
uint32_t pcmCounter;
uint32_t pcmSize;
int16_t* pcm;
uint8_t* mp3;
uint8_t* outputBuffer;
bool outputInitilized;
};