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simple flac to mp3 conversion

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This commit is contained in:
Blue 2023-07-16 20:36:25 -03:00
parent c72269f77a
commit 7cea7ed30b
Signed by: blue
GPG Key ID: 9B203B252A63EE38
4 changed files with 202 additions and 77 deletions
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1
CMakeLists.txt
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@ -19,6 +19,7 @@ add_executable(mlc
main.cpp
help.cpp
decoded.cpp
flactomp3.cpp
)
target_link_libraries(mlc

150
flactomp3.cpp Normal file
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@ -0,0 +1,150 @@
#include "flactomp3.h"
constexpr uint16_t flacBlockMaxSize = 4096;
FLACtoMP3::FLACtoMP3(uint8_t size) :
inPath(),
outPath(),
decoder(FLAC__stream_decoder_new()),
encoder(lame_init()),
statusFLAC(),
output(),
pcmCounter(0),
pcmSize(size * flacBlockMaxSize),
pcm(new int16_t[pcmSize * 2]),
mp3(new uint8_t[pcmSize])
{
}
FLACtoMP3::~FLACtoMP3() {
lame_close(encoder);
FLAC__stream_decoder_delete(decoder);
delete[] pcm;
delete[] mp3;
}
void FLACtoMP3::run() {
FLAC__bool ok = FLAC__stream_decoder_process_until_end_of_stream(decoder);
std::cout << "decoding: ";
if (ok)
std::cout << "succeeded";
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();
}
void FLACtoMP3::setInputFile(const std::string& path) {
if (inPath.size() > 0)
throw 1;
inPath = path;
FLAC__stream_decoder_set_md5_checking(decoder, true);
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;
// 3. Do some settings (OPTIONAL)
lame_set_in_samplerate(encoder, 44100);
lame_set_VBR(encoder, vbr_default);
lame_set_VBR_quality(encoder, 2);
// 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;
}
output.open(path, std::ios::out | std::ios::binary);
}
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];
++pcmCounter;
}
if (pcmCounter == pcmSize)
flush();
}
void FLACtoMP3::flush() {
int nwrite = lame_encode_buffer_interleaved(
encoder,
pcm,
pcmCounter,
mp3,
pcmSize
);
output.write((char*)mp3, nwrite);
pcmCounter = 0;
}
void FLACtoMP3::metadata(const FLAC__StreamDecoder* decoder, const FLAC__StreamMetadata* metadata, void* client_data) {
}
FLAC__StreamDecoderWriteStatus FLACtoMP3::write(
const FLAC__StreamDecoder* decoder,
const FLAC__Frame* frame,
const FLAC__int32 * const buffer[],
void* client_data
){
FLACtoMP3* self = static_cast<FLACtoMP3*>(client_data);
self->decodeFrame(buffer, frame->header.blocksize);
// 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;
}
// /* 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]);
// }
return FLAC__STREAM_DECODER_WRITE_STATUS_CONTINUE;
}
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;
}

46
flactomp3.h Normal file
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@ -0,0 +1,46 @@
#pragma once
#include "FLAC/stream_decoder.h"
#include <lame/lame.h>
#include <string>
#include <iostream>
#include <ios>
#include <fstream>
class FLACtoMP3 {
public:
FLACtoMP3(uint8_t size = 4);
~FLACtoMP3();
void setInputFile(const std::string& path);
void setOutputFile(const std::string& path);
void run();
private:
void decodeFrame(const int32_t * const buffer[], uint32_t size);
void flush();
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);
static FLAC__StreamDecoderWriteStatus write(
const FLAC__StreamDecoder *decoder,
const FLAC__Frame *frame,
const FLAC__int32 * const buffer[],
void *client_data
);
private:
std::string inPath;
std::string outPath;
FLAC__StreamDecoder *decoder;
lame_t encoder;
FLAC__StreamDecoderInitStatus statusFLAC;
std::ofstream output;
uint32_t pcmCounter;
uint32_t pcmSize;
int16_t* pcm;
uint8_t* mp3;
};

82
main.cpp
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@ -5,7 +5,7 @@
#include <lame/lame.h>
#include "help.h"
#include "decoded.h"
#include "flactomp3.h"
int main(int argc, char **argv) {
if (argc < 2) {
@ -20,82 +20,10 @@ int main(int argc, char **argv) {
return 0;
}
Decoded* decoded = Decoded::fromFLACFile(firstArgument);
decoded->saveWaveToFile("./out.wav");
// FILE *mp3 = fopen("output.mp3", "wb");
// size_t nread;
// int ret, nwrite;
//
// // 1. Get lame version (OPTIONAL)
// std::cout << "Using LAME v" << get_lame_version() << std::endl;
//
// const int PCM_SIZE = 8192;
// const int MP3_SIZE = 8192;
//
// short pcm_buffer[PCM_SIZE * 2];
// unsigned char mp3_buffer[MP3_SIZE];
//
// // 2. Initializing
// lame_t lame = lame_init();
//
// // 3. Do some settings (OPTIONAL)
// // lame_set_in_samplerate(lame, 48000);
// lame_set_VBR(lame, vbr_default);
// // lame_set_VBR_quality(lame, 2);
//
// // 4. Initialize parameters
// ret = lame_init_params(lame);
// if (ret < 0) {
// std::cout << "Error occurred during parameters initializing. Code = " << ret << std::endl;
// return 3;
// }
//
// do {
// // Read PCM_SIZE of array
// nread = fread(pcm_buffer, 2 * sizeof(short), PCM_SIZE, pcm);
// if (nread != 0) {
// // 5. Encode
// int nsamples = nread;
// short buffer_l[nsamples];
// short buffer_r[nsamples];
//
// printf("nread = %d\n", nread);
// printf("pcm_buffer.length = %d\n", sizeof(pcm_buffer)/sizeof(short));
//
// int j = 0;
// int i = 0;
// for (i = 0; i < nsamples; i++) {
// buffer_l[i] = pcm_buffer[j++];
// buffer_r[i] = pcm_buffer[j++];
//
// }
//
// nwrite = lame_encode_buffer(lame, buffer_l, buffer_r, nread,
// mp3_buffer, MP3_SIZE);
// } else {
// // 6. Flush and give some final frames
// nwrite = lame_encode_flush(lame, mp3_buffer, MP3_SIZE);
// }
//
// if (nwrite < 0) {
// printf("Error occurred during encoding. Code = %d\n", nwrite);
// return 1;
// }
//
// fwrite(mp3_buffer, nwrite, 1, mp3);
// } while (nread != 0);
//
// // 7. Write INFO tag (OPTIONAL)
// // lame_mp3_tags_fid(lame, mp3);
//
// // 8. Free internal data structures
// lame_close(lame);
//
// fclose(mp3);
delete decoded;
FLACtoMP3 pipe;
pipe.setInputFile(firstArgument);
pipe.setOutputFile("out.mp3");
pipe.run();
return 0;
}