Decoded FLAC to a valid WAV
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9B203B252A63EE38
@ -1,7 +1,29 @@
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cmake_minimum_required(VERSION 3.0)
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project(
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mlc
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VERSION 0.0.1
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DESCRIPTION "Media Library Compiler: rips your media library to a lossy compilation"
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LANGUAGES CXX
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)
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cmake_policy(SET CMP0076 NEW)
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cmake_policy(SET CMP0079 NEW)
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project(mlc)
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set(CMAKE_CXX_STANDARD 17)
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set(CMAKE_CXX_STANDARD_REQUIRED ON)
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set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} "${CMAKE_SOURCE_DIR}/cmake")
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add_executable(mlc main.cpp)
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find_package(LAME REQUIRED)
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find_package(FLAC REQUIRED)
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add_executable(mlc
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main.cpp
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help.cpp
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decoded.cpp
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)
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target_link_libraries(mlc
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${LAME_LIBRARIES}
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FLAC
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)
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install(TARGETS mlc RUNTIME DESTINATION bin)
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20
cmake/FindLAME.cmake
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20
cmake/FindLAME.cmake
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#copied from here, thank you
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#https://github.com/sipwise/sems/blob/master/cmake/FindLame.cmake
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FIND_PATH(LAME_INCLUDE_DIR lame/lame.h)
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FIND_LIBRARY(LAME_LIBRARIES NAMES mp3lame)
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IF(LAME_INCLUDE_DIR AND LAME_LIBRARIES)
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SET(LAME_FOUND TRUE)
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ENDIF(LAME_INCLUDE_DIR AND LAME_LIBRARIES)
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IF(LAME_FOUND)
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IF (NOT Lame_FIND_QUIETLY)
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MESSAGE(STATUS "Found lame includes: ${LAME_INCLUDE_DIR}/lame/lame.h")
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MESSAGE(STATUS "Found lame library: ${LAME_LIBRARIES}")
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ENDIF (NOT Lame_FIND_QUIETLY)
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ELSE(LAME_FOUND)
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IF (Lame_FIND_REQUIRED)
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MESSAGE(FATAL_ERROR "Could NOT find lame development files")
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ENDIF (Lame_FIND_REQUIRED)
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ENDIF(LAME_FOUND)
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202
decoded.cpp
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202
decoded.cpp
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#include "decoded.h"
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#include <iostream>
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#include <ios>
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#include <fstream>
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constexpr uint8_t waveDeclarationSize = 8;
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constexpr uint8_t waveDescriptionSize = 36;
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constexpr uint8_t waveHeaderSize = waveDeclarationSize + waveDescriptionSize;
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Decoded::Decoded():
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totalSamples(0),
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sampleRate(0),
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channels(0),
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depth(0),
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streamPosition(0),
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stream(nullptr),
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streamSize(0)
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{}
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Decoded::~Decoded() {
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if (streamInitialized())
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delete[] stream;
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}
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bool Decoded::streamInitialized() const {
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return sampleRate != 0;
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}
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void Decoded::initializeStream(uint64_t total, uint32_t rate, uint16_t channels, uint16_t depth) {
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if (streamInitialized())
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throw 1;
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totalSamples = total;
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sampleRate = rate;
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Decoded::channels = channels;
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Decoded::depth = depth;
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streamPosition = 0;
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streamSize = pcmSize() + waveHeaderSize;
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stream = new uint8_t[streamSize];
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}
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void Decoded::printInfo() const {
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std::cout << "sample rate : " << sampleRate << " Hz" << std::endl;
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std::cout << "channels : " << channels << std::endl;
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std::cout << "bits per sample : " << depth << std::endl;
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std::cout << "total samples : " << totalSamples << std::endl;
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}
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void Decoded::saveWaveToFile(const std::string& path) {
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std::ofstream fp;
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fp.open(path, std::ios::out | std::ios::binary);
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fp.write((char*)stream, streamSize);
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fp.close();
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}
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uint64_t Decoded::waveStremSize() const {
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return streamSize;
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}
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void Decoded::write(uint16_t data) {
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uint16_t* stream16 = (uint16_t*)stream;
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stream16[streamPosition / 2] = data;
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streamPosition += 2;
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}
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void Decoded::write(std::string_view data) {
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for (const char& letter : data) {
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stream[streamPosition] = (uint8_t)letter;
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++streamPosition;
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}
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}
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void Decoded::write(uint32_t data) {
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uint32_t* stream32 = (uint32_t*)stream;
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stream32[streamPosition / 4] = data;
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streamPosition += 4;
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}
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void Decoded::writeWaveHeader() {
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uint32_t pcm = pcmSize();
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uint8_t bytesPerSample = depth / 8;
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write("RIFF"); //4
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write(pcm + waveDescriptionSize); //8
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write("WAVEfmt "); //8 //16
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write((uint32_t)16); //12 //20
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write((uint16_t)1); //14 //22
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write(channels); //16 //24
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write(sampleRate); //20 //28
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write((uint32_t)(sampleRate * channels * bytesPerSample)); //24 //32
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write((uint16_t)(channels * bytesPerSample));//block align //26 //34
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write(depth); //28 //36
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write("data"); //32 //40
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write(pcm); //36 //44
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}
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uint64_t Decoded::pcmSize() const {
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return totalSamples * channels * (depth / 8);
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}
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void Decoded::FLACerror(const FLAC__StreamDecoder* decoder, FLAC__StreamDecoderErrorStatus status, void* client_data) {
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(void)decoder, (void)client_data;
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std::cout << "Got error callback: " << FLAC__StreamDecoderErrorStatusString[status] << std::endl;
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}
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void Decoded::FLACmetadata(const FLAC__StreamDecoder* decoder, const FLAC__StreamMetadata* metadata, void* client_data) {
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(void)(decoder);
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Decoded* decoded = static_cast<Decoded*>(client_data);
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/* print some stats */
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if(metadata->type == FLAC__METADATA_TYPE_STREAMINFO) {
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/* save for later */
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decoded->initializeStream(
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metadata->data.stream_info.total_samples,
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metadata->data.stream_info.sample_rate,
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metadata->data.stream_info.channels,
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metadata->data.stream_info.bits_per_sample
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);
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decoded->printInfo();
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}
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}
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FLAC__StreamDecoderWriteStatus Decoded::FLACwrite(
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const FLAC__StreamDecoder* decoder,
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const FLAC__Frame* frame,
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const FLAC__int32 * const buffer[],
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void* client_data
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) {
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Decoded* decoded = static_cast<Decoded*>(client_data);
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if (decoded->totalSamples == 0) {
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std::cout << "ERROR: this example only works for FLAC files that have a total_samples count in STREAMINFO" << std::endl;
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return FLAC__STREAM_DECODER_WRITE_STATUS_ABORT;
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}
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if (decoded->channels != 2 || decoded->depth != 16) {
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std::cout << "ERROR: this example only supports 16bit stereo streams" << std::endl;
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return FLAC__STREAM_DECODER_WRITE_STATUS_ABORT;
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}
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if (frame->header.channels != 2) {
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std::cout << "ERROR: This frame contains " << frame->header.channels << " channels (should be 2)" << std::endl;
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return FLAC__STREAM_DECODER_WRITE_STATUS_ABORT;
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}
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if (buffer[0] == NULL) {
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std::cout << "ERROR: buffer [0] is NULL" << std::endl;
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return FLAC__STREAM_DECODER_WRITE_STATUS_ABORT;
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}
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if (buffer[1] == NULL) {
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std::cout << "ERROR: buffer [1] is NULL" << std::endl;
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return FLAC__STREAM_DECODER_WRITE_STATUS_ABORT;
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}
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/* write WAVE header before we write the first frame */
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if (frame->header.number.sample_number == 0)
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decoded->writeWaveHeader();
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/* write decoded PCM samples */
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for (size_t i = 0; i < frame->header.blocksize; i++) {
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decoded->write((uint16_t)buffer[0][i]);
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decoded->write((uint16_t)buffer[1][i]);
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}
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return FLAC__STREAM_DECODER_WRITE_STATUS_CONTINUE;
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}
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Decoded* Decoded::fromFLACFile(const std::string& path) {
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FLAC__bool ok = true;
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FLAC__StreamDecoder *decoder = FLAC__stream_decoder_new();
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FLAC__StreamDecoderInitStatus init_status;
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Decoded* decoded = new Decoded;
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if (decoder == NULL) {
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std::cout << "error allocating flac decoder" << std::endl;
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throw 2;
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}
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FLAC__stream_decoder_set_md5_checking(decoder, true);
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init_status = FLAC__stream_decoder_init_file(decoder, path.c_str(), FLACwrite, FLACmetadata, FLACerror, decoded);
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ok = init_status != FLAC__STREAM_DECODER_INIT_STATUS_OK;
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if (ok) {
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std::cout << "error initializing decoder: " << FLAC__StreamDecoderInitStatusString[init_status] << std::endl;
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} else {
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ok = FLAC__stream_decoder_process_until_end_of_stream(decoder);
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std::cout << "decoding: ";
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if (ok)
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std::cout << "succeeded";
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else
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std::cout << "FAILED";
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std::cout << std::endl;
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std::cout << " state: " << FLAC__StreamDecoderStateString[FLAC__stream_decoder_get_state(decoder)] << std::endl;
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}
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FLAC__stream_decoder_delete(decoder);
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return decoded;
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}
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44
decoded.h
Normal file
44
decoded.h
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@ -0,0 +1,44 @@
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#pragma once
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#include <stdint.h>
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#include <string_view>
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#include "FLAC/stream_decoder.h"
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class Decoded {
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public:
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Decoded();
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~Decoded();
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void initializeStream(uint64_t total, uint32_t rate, uint16_t channels, uint16_t depth);
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bool streamInitialized() const;
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void printInfo() const;
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uint64_t pcmSize() const;
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uint64_t waveStremSize() const;
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void write(uint16_t data);
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void write(uint32_t data);
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void write(std::string_view data);
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void writeWaveHeader();
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void saveWaveToFile(const std::string& path);
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static Decoded* fromFLACFile(const std::string& path);
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static void FLACerror(const FLAC__StreamDecoder *decoder, FLAC__StreamDecoderErrorStatus status, void *client_data);
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static void FLACmetadata(const FLAC__StreamDecoder *decoder, const FLAC__StreamMetadata *metadata, void *client_data);
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static FLAC__StreamDecoderWriteStatus FLACwrite(
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const FLAC__StreamDecoder *decoder,
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const FLAC__Frame *frame,
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const FLAC__int32 * const buffer[],
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void *client_data
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);
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private:
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uint64_t totalSamples;
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uint32_t sampleRate;
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uint16_t channels;
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uint16_t depth;
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uint64_t streamPosition;
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uint8_t* stream;
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uint64_t streamSize;
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};
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7
help.cpp
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7
help.cpp
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#include "help.h"
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#include "iostream"
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void printHelp() {
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std::cout << "Sorry, there is no help yet. It will arrive one day... I hope" << std::endl;
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}
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97
main.cpp
97
main.cpp
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#include <iostream>
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#include <string>
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#include "FLAC/stream_decoder.h"
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#include <lame/lame.h>
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#include "help.h"
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#include "decoded.h"
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int main(int argc, char **argv) {
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std::cout << "Hello, world!" << std::endl;
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if (argc < 2) {
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std::cout << "Insufficient amount of arguments, launch with \"--help\" argument to see usage" << std::endl;
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return 1;
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}
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const std::string firstArgument(argv[1]);
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if (firstArgument == "--help") {
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printHelp();
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return 0;
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}
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Decoded* decoded = Decoded::fromFLACFile(firstArgument);
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decoded->saveWaveToFile("./out.wav");
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// FILE *mp3 = fopen("output.mp3", "wb");
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// size_t nread;
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// int ret, nwrite;
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//
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// // 1. Get lame version (OPTIONAL)
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// std::cout << "Using LAME v" << get_lame_version() << std::endl;
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//
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// const int PCM_SIZE = 8192;
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// const int MP3_SIZE = 8192;
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//
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// short pcm_buffer[PCM_SIZE * 2];
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// unsigned char mp3_buffer[MP3_SIZE];
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//
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// // 2. Initializing
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// lame_t lame = lame_init();
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//
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// // 3. Do some settings (OPTIONAL)
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// // lame_set_in_samplerate(lame, 48000);
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// lame_set_VBR(lame, vbr_default);
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// // lame_set_VBR_quality(lame, 2);
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//
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// // 4. Initialize parameters
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// ret = lame_init_params(lame);
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// if (ret < 0) {
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// std::cout << "Error occurred during parameters initializing. Code = " << ret << std::endl;
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// return 3;
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// }
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//
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// do {
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// // Read PCM_SIZE of array
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// nread = fread(pcm_buffer, 2 * sizeof(short), PCM_SIZE, pcm);
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// if (nread != 0) {
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// // 5. Encode
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// int nsamples = nread;
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// short buffer_l[nsamples];
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// short buffer_r[nsamples];
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//
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// printf("nread = %d\n", nread);
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// printf("pcm_buffer.length = %d\n", sizeof(pcm_buffer)/sizeof(short));
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//
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// int j = 0;
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// int i = 0;
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// for (i = 0; i < nsamples; i++) {
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// buffer_l[i] = pcm_buffer[j++];
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// buffer_r[i] = pcm_buffer[j++];
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//
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// }
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//
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// nwrite = lame_encode_buffer(lame, buffer_l, buffer_r, nread,
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// mp3_buffer, MP3_SIZE);
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// } else {
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// // 6. Flush and give some final frames
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// nwrite = lame_encode_flush(lame, mp3_buffer, MP3_SIZE);
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// }
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//
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// if (nwrite < 0) {
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// printf("Error occurred during encoding. Code = %d\n", nwrite);
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// return 1;
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// }
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//
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// fwrite(mp3_buffer, nwrite, 1, mp3);
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// } while (nread != 0);
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//
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// // 7. Write INFO tag (OPTIONAL)
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// // lame_mp3_tags_fid(lame, mp3);
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//
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// // 8. Free internal data structures
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// lame_close(lame);
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//
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// fclose(mp3);
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delete decoded;
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return 0;
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}
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