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winamp/Src/external_dependencies/openmpt-trunk/soundlib/SampleFormatFLAC.cpp

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/*
* SampleFormatFLAC.cpp
* --------------------
* Purpose: FLAC sample import.
* Notes :
* Authors: OpenMPT Devs
* The OpenMPT source code is released under the BSD license. Read LICENSE for more details.
*/
#include "stdafx.h"
#include "Sndfile.h"
#ifdef MODPLUG_TRACKER
#include "../mptrack/TrackerSettings.h"
#endif //MODPLUG_TRACKER
#ifndef MODPLUG_NO_FILESAVE
#include "../common/mptFileIO.h"
#endif
#include "../common/misc_util.h"
#include "Tagging.h"
#include "Loaders.h"
#include "WAVTools.h"
#include "../common/FileReader.h"
#include "modsmp_ctrl.h"
#include "openmpt/soundbase/Copy.hpp"
#include "openmpt/soundbase/SampleConvert.hpp"
#include "openmpt/soundbase/SampleDecode.hpp"
#include "../soundlib/SampleCopy.h"
#include "../soundlib/ModSampleCopy.h"
#include "mpt/io/base.hpp"
#include "mpt/io/io.hpp"
#include "mpt/io/io_stdstream.hpp"
//#include "mpt/crc/crc.hpp"
#include "OggStream.h"
#ifdef MPT_WITH_OGG
#if MPT_COMPILER_CLANG
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wreserved-id-macro"
#endif // MPT_COMPILER_CLANG
#include <ogg/ogg.h>
#if MPT_COMPILER_CLANG
#pragma clang diagnostic pop
#endif // MPT_COMPILER_CLANG
#endif // MPT_WITH_OGG
#ifdef MPT_WITH_FLAC
#if MPT_COMPILER_CLANG
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wreserved-id-macro"
#endif // MPT_COMPILER_CLANG
#include <FLAC/stream_decoder.h>
#include <FLAC/stream_encoder.h>
#include <FLAC/metadata.h>
#if MPT_COMPILER_CLANG
#pragma clang diagnostic pop
#endif // MPT_COMPILER_CLANG
#endif // MPT_WITH_FLAC
OPENMPT_NAMESPACE_BEGIN
///////////////////////////////////////////////////////////////////////////////////////////////////
// FLAC Samples
#ifdef MPT_WITH_FLAC
struct FLACDecoder
{
FileReader &file;
CSoundFile &sndFile;
SAMPLEINDEX sample;
bool ready;
FLACDecoder(FileReader &f, CSoundFile &sf, SAMPLEINDEX smp) : file(f), sndFile(sf), sample(smp), ready(false) { }
static FLAC__StreamDecoderReadStatus read_cb(const FLAC__StreamDecoder *, FLAC__byte buffer[], size_t *bytes, void *client_data)
{
FileReader &file = static_cast<FLACDecoder *>(client_data)->file;
if(*bytes > 0)
{
FileReader::off_t readBytes = *bytes;
LimitMax(readBytes, file.BytesLeft());
file.ReadRaw(mpt::byte_cast<mpt::byte_span>(mpt::span(buffer, readBytes)));
*bytes = readBytes;
if(*bytes == 0)
return FLAC__STREAM_DECODER_READ_STATUS_END_OF_STREAM;
else
return FLAC__STREAM_DECODER_READ_STATUS_CONTINUE;
} else
{
return FLAC__STREAM_DECODER_READ_STATUS_ABORT;
}
}
static FLAC__StreamDecoderSeekStatus seek_cb(const FLAC__StreamDecoder *, FLAC__uint64 absolute_byte_offset, void *client_data)
{
FileReader &file = static_cast<FLACDecoder *>(client_data)->file;
if(!file.Seek(static_cast<FileReader::off_t>(absolute_byte_offset)))
return FLAC__STREAM_DECODER_SEEK_STATUS_ERROR;
else
return FLAC__STREAM_DECODER_SEEK_STATUS_OK;
}
static FLAC__StreamDecoderTellStatus tell_cb(const FLAC__StreamDecoder *, FLAC__uint64 *absolute_byte_offset, void *client_data)
{
FileReader &file = static_cast<FLACDecoder *>(client_data)->file;
*absolute_byte_offset = file.GetPosition();
return FLAC__STREAM_DECODER_TELL_STATUS_OK;
}
static FLAC__StreamDecoderLengthStatus length_cb(const FLAC__StreamDecoder *, FLAC__uint64 *stream_length, void *client_data)
{
FileReader &file = static_cast<FLACDecoder *>(client_data)->file;
*stream_length = file.GetLength();
return FLAC__STREAM_DECODER_LENGTH_STATUS_OK;
}
static FLAC__bool eof_cb(const FLAC__StreamDecoder *, void *client_data)
{
FileReader &file = static_cast<FLACDecoder *>(client_data)->file;
return file.NoBytesLeft();
}
static FLAC__StreamDecoderWriteStatus write_cb(const FLAC__StreamDecoder *decoder, const FLAC__Frame *frame, const FLAC__int32 *const buffer[], void *client_data)
{
FLACDecoder &client = *static_cast<FLACDecoder *>(client_data);
ModSample &sample = client.sndFile.GetSample(client.sample);
if(frame->header.number.sample_number >= sample.nLength || !client.ready)
{
// We're reading beyond the sample size already, or we aren't even ready to decode yet!
return FLAC__STREAM_DECODER_WRITE_STATUS_ABORT;
}
// Number of samples to be copied in this call
const SmpLength copySamples = std::min(static_cast<SmpLength>(frame->header.blocksize), static_cast<SmpLength>(sample.nLength - frame->header.number.sample_number));
// Number of target channels
const uint8 modChannels = sample.GetNumChannels();
// Offset (in samples) into target data
const size_t offset = static_cast<size_t>(frame->header.number.sample_number) * modChannels;
// Source size in bytes
const size_t srcSize = frame->header.blocksize * 4;
// Source bit depth
const unsigned int bps = frame->header.bits_per_sample;
MPT_ASSERT((bps <= 8 && sample.GetElementarySampleSize() == 1) || (bps > 8 && sample.GetElementarySampleSize() == 2));
MPT_ASSERT(modChannels <= FLAC__stream_decoder_get_channels(decoder));
MPT_ASSERT(bps == FLAC__stream_decoder_get_bits_per_sample(decoder));
MPT_UNREFERENCED_PARAMETER(decoder); // decoder is unused if ASSERTs are compiled out
// Do the sample conversion
for(uint8 chn = 0; chn < modChannels; chn++)
{
if(bps <= 8)
{
int8 *sampleData8 = sample.sample8() + offset;
CopySample<SC::ConversionChain<SC::ConvertShift< int8, int32, 0>, SC::DecodeIdentity<int32> > >(sampleData8 + chn, copySamples, modChannels, buffer[chn], srcSize, 1);
} else if(bps <= 16)
{
int16 *sampleData16 = sample.sample16() + offset;
CopySample<SC::ConversionChain<SC::ConvertShift<int16, int32, 0>, SC::DecodeIdentity<int32> > >(sampleData16 + chn, copySamples, modChannels, buffer[chn], srcSize, 1);
} else if(bps <= 24)
{
int16 *sampleData16 = sample.sample16() + offset;
CopySample<SC::ConversionChain<SC::ConvertShift<int16, int32, 8>, SC::DecodeIdentity<int32> > >(sampleData16 + chn, copySamples, modChannels, buffer[chn], srcSize, 1);
} else if(bps <= 32)
{
int16 *sampleData16 = sample.sample16() + offset;
CopySample<SC::ConversionChain<SC::ConvertShift<int16, int32, 16>, SC::DecodeIdentity<int32> > >(sampleData16 + chn, copySamples, modChannels, buffer[chn], srcSize, 1);
}
}
return FLAC__STREAM_DECODER_WRITE_STATUS_CONTINUE;
}
static void metadata_cb(const FLAC__StreamDecoder *, const FLAC__StreamMetadata *metadata, void *client_data)
{
FLACDecoder &client = *static_cast<FLACDecoder *>(client_data);
if(client.sample > client.sndFile.GetNumSamples())
{
client.sndFile.m_nSamples = client.sample;
}
ModSample &sample = client.sndFile.GetSample(client.sample);
if(metadata->type == FLAC__METADATA_TYPE_STREAMINFO && metadata->data.stream_info.total_samples != 0)
{
// Init sample information
client.sndFile.DestroySampleThreadsafe(client.sample);
client.sndFile.m_szNames[client.sample] = "";
sample.Initialize();
sample.uFlags.set(CHN_16BIT, metadata->data.stream_info.bits_per_sample > 8);
sample.uFlags.set(CHN_STEREO, metadata->data.stream_info.channels > 1);
sample.nLength = mpt::saturate_cast<SmpLength>(metadata->data.stream_info.total_samples);
LimitMax(sample.nLength, MAX_SAMPLE_LENGTH);
sample.nC5Speed = metadata->data.stream_info.sample_rate;
client.ready = (sample.AllocateSample() != 0);
} else if(metadata->type == FLAC__METADATA_TYPE_APPLICATION && !memcmp(metadata->data.application.id, "riff", 4) && client.ready)
{
// Try reading RIFF loop points and other sample information
FileReader data(mpt::as_span(metadata->data.application.data, metadata->length));
FileReader::ChunkList<RIFFChunk> chunks = data.ReadChunks<RIFFChunk>(2);
// We're not really going to read a WAV file here because there will be only one RIFF chunk per metadata event, but we can still re-use the code for parsing RIFF metadata...
WAVReader riffReader(data);
riffReader.FindMetadataChunks(chunks);
riffReader.ApplySampleSettings(sample, client.sndFile.GetCharsetInternal(), client.sndFile.m_szNames[client.sample]);
} else if(metadata->type == FLAC__METADATA_TYPE_VORBIS_COMMENT && client.ready)
{
// Try reading Vorbis Comments for sample title, sample rate and loop points
SmpLength loopStart = 0, loopLength = 0;
for(FLAC__uint32 i = 0; i < metadata->data.vorbis_comment.num_comments; i++)
{
const char *tag = mpt::byte_cast<const char *>(metadata->data.vorbis_comment.comments[i].entry);
const FLAC__uint32 length = metadata->data.vorbis_comment.comments[i].length;
if(length > 6 && !mpt::CompareNoCaseAscii(tag, "TITLE=", 6))
{
client.sndFile.m_szNames[client.sample] = mpt::ToCharset(client.sndFile.GetCharsetInternal(), mpt::Charset::UTF8, mpt::String::ReadBuf(mpt::String::maybeNullTerminated, tag + 6, length - 6));
} else if(length > 11 && !mpt::CompareNoCaseAscii(tag, "SAMPLERATE=", 11))
{
uint32 sampleRate = ConvertStrTo<uint32>(tag + 11);
if(sampleRate > 0) sample.nC5Speed = sampleRate;
} else if(length > 10 && !mpt::CompareNoCaseAscii(tag, "LOOPSTART=", 10))
{
loopStart = ConvertStrTo<SmpLength>(tag + 10);
} else if(length > 11 && !mpt::CompareNoCaseAscii(tag, "LOOPLENGTH=", 11))
{
loopLength = ConvertStrTo<SmpLength>(tag + 11);
}
}
if(loopLength > 0)
{
sample.nLoopStart = loopStart;
sample.nLoopEnd = loopStart + loopLength;
sample.uFlags.set(CHN_LOOP);
sample.SanitizeLoops();
}
}
}
static void error_cb(const FLAC__StreamDecoder *, FLAC__StreamDecoderErrorStatus, void *)
{
}
};
#endif // MPT_WITH_FLAC
bool CSoundFile::ReadFLACSample(SAMPLEINDEX sample, FileReader &file)
{
#ifdef MPT_WITH_FLAC
file.Rewind();
bool isOgg = false;
#ifdef MPT_WITH_OGG
uint32 oggFlacBitstreamSerial = 0;
#endif
// Check whether we are dealing with native FLAC, OggFlac or no FLAC at all.
if(file.ReadMagic("fLaC"))
{ // ok
isOgg = false;
#ifdef MPT_WITH_OGG
} else if(file.ReadMagic("OggS"))
{ // use libogg to find the first OggFlac stream header
file.Rewind();
bool oggOK = false;
bool needMoreData = true;
constexpr long bufsize = 65536;
std::size_t readSize = 0;
char *buf = nullptr;
ogg_sync_state oy;
MemsetZero(oy);
ogg_page og;
MemsetZero(og);
std::map<uint32, ogg_stream_state*> oggStreams;
ogg_packet op;
MemsetZero(op);
if(ogg_sync_init(&oy) != 0)
{
return false;
}
while(needMoreData)
{
if(file.NoBytesLeft())
{ // stop at EOF
oggOK = false;
needMoreData = false;
break;
}
buf = ogg_sync_buffer(&oy, bufsize);
if(!buf)
{
oggOK = false;
needMoreData = false;
break;
}
readSize = file.ReadRaw(mpt::span(buf, bufsize)).size();
if(ogg_sync_wrote(&oy, static_cast<long>(readSize)) != 0)
{
oggOK = false;
needMoreData = false;
break;
}
while(ogg_sync_pageout(&oy, &og) == 1)
{
if(!ogg_page_bos(&og))
{ // we stop scanning when seeing the first noo-begin-of-stream page
oggOK = false;
needMoreData = false;
break;
}
uint32 serial = ogg_page_serialno(&og);
if(!oggStreams[serial])
{ // previously unseen stream serial
oggStreams[serial] = new ogg_stream_state();
MemsetZero(*(oggStreams[serial]));
if(ogg_stream_init(oggStreams[serial], serial) != 0)
{
delete oggStreams[serial];
oggStreams.erase(serial);
oggOK = false;
needMoreData = false;
break;
}
}
if(ogg_stream_pagein(oggStreams[serial], &og) != 0)
{ // invalid page
oggOK = false;
needMoreData = false;
break;
}
if(ogg_stream_packetout(oggStreams[serial], &op) != 1)
{ // partial or broken packet, continue with more data
continue;
}
if(op.packetno != 0)
{ // non-begin-of-stream packet.
// This should not appear on first page for any known ogg codec,
// but deal gracefully with badly mused streams in that regard.
continue;
}
FileReader packet(mpt::as_span(op.packet, op.bytes));
if(packet.ReadIntLE<uint8>() == 0x7f && packet.ReadMagic("FLAC"))
{ // looks like OggFlac
oggOK = true;
oggFlacBitstreamSerial = serial;
needMoreData = false;
break;
}
}
}
while(oggStreams.size() > 0)
{
uint32 serial = oggStreams.begin()->first;
ogg_stream_clear(oggStreams[serial]);
delete oggStreams[serial];
oggStreams.erase(serial);
}
ogg_sync_clear(&oy);
if(!oggOK)
{
return false;
}
isOgg = true;
#else // !MPT_WITH_OGG
} else if(file.CanRead(78) && file.ReadMagic("OggS"))
{ // first OggFlac page is exactly 78 bytes long
// only support plain OggFlac here with the FLAC logical bitstream being the first one
uint8 oggPageVersion = file.ReadIntLE<uint8>();
uint8 oggPageHeaderType = file.ReadIntLE<uint8>();
uint64 oggPageGranulePosition = file.ReadIntLE<uint64>();
uint32 oggPageBitstreamSerialNumber = file.ReadIntLE<uint32>();
uint32 oggPageSequenceNumber = file.ReadIntLE<uint32>();
uint32 oggPageChecksum = file.ReadIntLE<uint32>();
uint8 oggPageSegments = file.ReadIntLE<uint8>();
uint8 oggPageSegmentLength = file.ReadIntLE<uint8>();
if(oggPageVersion != 0)
{ // unknown Ogg version
return false;
}
if(!(oggPageHeaderType & 0x02) || (oggPageHeaderType& 0x01))
{ // not BOS or continuation
return false;
}
if(oggPageGranulePosition != 0)
{ // not starting position
return false;
}
if(oggPageSequenceNumber != 0)
{ // not first page
return false;
}
// skip CRC check for now
if(oggPageSegments != 1)
{ // first OggFlac page must contain exactly 1 segment
return false;
}
if(oggPageSegmentLength != 51)
{ // segment length must be 51 bytes in OggFlac mapping
return false;
}
if(file.ReadIntLE<uint8>() != 0x7f)
{ // OggFlac mapping demands 0x7f packet type
return false;
}
if(!file.ReadMagic("FLAC"))
{ // OggFlac magic
return false;
}
if(file.ReadIntLE<uint8>() != 0x01)
{ // OggFlac major version
return false;
}
// by now, we are pretty confident that we are not parsing random junk
isOgg = true;
#endif // MPT_WITH_OGG
} else
{
return false;
}
file.Rewind();
FLAC__StreamDecoder *decoder = FLAC__stream_decoder_new();
if(decoder == nullptr)
{
return false;
}
#ifdef MPT_WITH_OGG
if(isOgg)
{
// force flac decoding of the logical bitstream that actually is OggFlac
if(!FLAC__stream_decoder_set_ogg_serial_number(decoder, oggFlacBitstreamSerial))
{
FLAC__stream_decoder_delete(decoder);
return false;
}
}
#endif
// Give me all the metadata!
FLAC__stream_decoder_set_metadata_respond_all(decoder);
FLACDecoder client(file, *this, sample);
// Init decoder
FLAC__StreamDecoderInitStatus initStatus = isOgg ?
FLAC__stream_decoder_init_ogg_stream(decoder, FLACDecoder::read_cb, FLACDecoder::seek_cb, FLACDecoder::tell_cb, FLACDecoder::length_cb, FLACDecoder::eof_cb, FLACDecoder::write_cb, FLACDecoder::metadata_cb, FLACDecoder::error_cb, &client)
:
FLAC__stream_decoder_init_stream(decoder, FLACDecoder::read_cb, FLACDecoder::seek_cb, FLACDecoder::tell_cb, FLACDecoder::length_cb, FLACDecoder::eof_cb, FLACDecoder::write_cb, FLACDecoder::metadata_cb, FLACDecoder::error_cb, &client)
;
if(initStatus != FLAC__STREAM_DECODER_INIT_STATUS_OK)
{
FLAC__stream_decoder_delete(decoder);
return false;
}
// Decode file
FLAC__stream_decoder_process_until_end_of_stream(decoder);
FLAC__stream_decoder_finish(decoder);
FLAC__stream_decoder_delete(decoder);
if(client.ready && Samples[sample].HasSampleData())
{
Samples[sample].Convert(MOD_TYPE_IT, GetType());
Samples[sample].PrecomputeLoops(*this, false);
return true;
}
#else
MPT_UNREFERENCED_PARAMETER(sample);
MPT_UNREFERENCED_PARAMETER(file);
#endif // MPT_WITH_FLAC
return false;
}
#ifdef MPT_WITH_FLAC
// RAII-style helper struct for FLAC encoder
struct FLAC__StreamEncoder_RAII
{
std::ostream &f;
FLAC__StreamEncoder *encoder = nullptr;
operator FLAC__StreamEncoder *() { return encoder; }
FLAC__StreamEncoder_RAII(std::ostream &f_) : f(f_), encoder(FLAC__stream_encoder_new()) { }
~FLAC__StreamEncoder_RAII()
{
FLAC__stream_encoder_delete(encoder);
}
static FLAC__StreamEncoderWriteStatus StreamEncoderWriteCallback(const FLAC__StreamEncoder *encoder, const FLAC__byte buffer[], size_t bytes, unsigned samples, unsigned current_frame, void *client_data)
{
mpt::ofstream & file = *reinterpret_cast<mpt::ofstream*>(client_data);
MPT_UNUSED_VARIABLE(encoder);
MPT_UNUSED_VARIABLE(samples);
MPT_UNUSED_VARIABLE(current_frame);
if(!mpt::IO::WriteRaw(file, mpt::as_span(buffer, bytes)))
{
return FLAC__STREAM_ENCODER_WRITE_STATUS_FATAL_ERROR;
}
return FLAC__STREAM_ENCODER_WRITE_STATUS_OK;
}
static FLAC__StreamEncoderSeekStatus StreamEncoderSeekCallback(const FLAC__StreamEncoder *encoder, FLAC__uint64 absolute_byte_offset, void *client_data)
{
mpt::ofstream & file = *reinterpret_cast<mpt::ofstream*>(client_data);
MPT_UNUSED_VARIABLE(encoder);
if(!mpt::in_range<mpt::IO::Offset>(absolute_byte_offset))
{
return FLAC__STREAM_ENCODER_SEEK_STATUS_ERROR;
}
if(!mpt::IO::SeekAbsolute(file, static_cast<mpt::IO::Offset>(absolute_byte_offset)))
{
return FLAC__STREAM_ENCODER_SEEK_STATUS_ERROR;
}
return FLAC__STREAM_ENCODER_SEEK_STATUS_OK;
}
static FLAC__StreamEncoderTellStatus StreamEncoderTellCallback(const FLAC__StreamEncoder *encoder, FLAC__uint64 *absolute_byte_offset, void *client_data)
{
mpt::ofstream & file = *reinterpret_cast<mpt::ofstream*>(client_data);
MPT_UNUSED_VARIABLE(encoder);
mpt::IO::Offset pos = mpt::IO::TellWrite(file);
if(pos < 0)
{
return FLAC__STREAM_ENCODER_TELL_STATUS_ERROR;
}
if(!mpt::in_range<FLAC__uint64>(pos))
{
return FLAC__STREAM_ENCODER_TELL_STATUS_ERROR;
}
*absolute_byte_offset = static_cast<FLAC__uint64>(pos);
return FLAC__STREAM_ENCODER_TELL_STATUS_OK;
}
};
class FLAC__StreamMetadata_RAII : public std::vector<FLAC__StreamMetadata *>
{
public:
FLAC__StreamMetadata_RAII(std::initializer_list<FLAC__StreamMetadata *> init)
: std::vector<FLAC__StreamMetadata *>(init)
{ }
~FLAC__StreamMetadata_RAII()
{
for(auto m : *this)
{
FLAC__metadata_object_delete(m);
}
}
};
#endif
#ifndef MODPLUG_NO_FILESAVE
bool CSoundFile::SaveFLACSample(SAMPLEINDEX nSample, std::ostream &f) const
{
#ifdef MPT_WITH_FLAC
const ModSample &sample = Samples[nSample];
if(sample.uFlags[CHN_ADLIB])
return false;
FLAC__StreamEncoder_RAII encoder(f);
if(encoder == nullptr)
return false;
uint32 sampleRate = sample.GetSampleRate(GetType());
// First off, set up all the metadata...
FLAC__StreamMetadata_RAII metadata =
{
FLAC__metadata_object_new(FLAC__METADATA_TYPE_VORBIS_COMMENT),
FLAC__metadata_object_new(FLAC__METADATA_TYPE_APPLICATION), // MPT sample information
FLAC__metadata_object_new(FLAC__METADATA_TYPE_APPLICATION), // Loop points
FLAC__metadata_object_new(FLAC__METADATA_TYPE_APPLICATION), // Cue points
};
unsigned numBlocks = 2;
if(metadata[0])
{
// Store sample name
FLAC__StreamMetadata_VorbisComment_Entry entry;
FLAC__metadata_object_vorbiscomment_entry_from_name_value_pair(&entry, "TITLE", mpt::ToCharset(mpt::Charset::UTF8, GetCharsetInternal(), m_szNames[nSample]).c_str());
FLAC__metadata_object_vorbiscomment_append_comment(metadata[0], entry, false);
FLAC__metadata_object_vorbiscomment_entry_from_name_value_pair(&entry, "ENCODER", mpt::ToCharset(mpt::Charset::UTF8, Version::Current().GetOpenMPTVersionString()).c_str());
FLAC__metadata_object_vorbiscomment_append_comment(metadata[0], entry, false);
if(sampleRate > FLAC__MAX_SAMPLE_RATE)
{
// FLAC only supports a sample rate of up to 655350 Hz.
// Store the real sample rate in a custom Vorbis comment.
FLAC__metadata_object_vorbiscomment_entry_from_name_value_pair(&entry, "SAMPLERATE", mpt::afmt::val(sampleRate).c_str());
FLAC__metadata_object_vorbiscomment_append_comment(metadata[0], entry, false);
}
}
if(metadata[1])
{
// Write MPT sample information
memcpy(metadata[1]->data.application.id, "riff", 4);
struct
{
RIFFChunk header;
WAVExtraChunk mptInfo;
} chunk;
chunk.header.id = RIFFChunk::idxtra;
chunk.header.length = sizeof(WAVExtraChunk);
chunk.mptInfo.ConvertToWAV(sample, GetType());
const uint32 length = sizeof(RIFFChunk) + sizeof(WAVExtraChunk);
FLAC__metadata_object_application_set_data(metadata[1], reinterpret_cast<FLAC__byte *>(&chunk), length, true);
}
if(metadata[numBlocks] && (sample.uFlags[CHN_LOOP | CHN_SUSTAINLOOP] || ModCommand::IsNote(sample.rootNote)))
{
// Store loop points / root note information
memcpy(metadata[numBlocks]->data.application.id, "riff", 4);
struct
{
RIFFChunk header;
WAVSampleInfoChunk info;
WAVSampleLoop loops[2];
} chunk;
chunk.header.id = RIFFChunk::idsmpl;
chunk.header.length = sizeof(WAVSampleInfoChunk);
chunk.info.ConvertToWAV(sample.GetSampleRate(GetType()), sample.rootNote);
if(sample.uFlags[CHN_SUSTAINLOOP])
{
chunk.loops[chunk.info.numLoops++].ConvertToWAV(sample.nSustainStart, sample.nSustainEnd, sample.uFlags[CHN_PINGPONGSUSTAIN]);
chunk.header.length += sizeof(WAVSampleLoop);
}
if(sample.uFlags[CHN_LOOP])
{
chunk.loops[chunk.info.numLoops++].ConvertToWAV(sample.nLoopStart, sample.nLoopEnd, sample.uFlags[CHN_PINGPONGLOOP]);
chunk.header.length += sizeof(WAVSampleLoop);
}
const uint32 length = sizeof(RIFFChunk) + chunk.header.length;
FLAC__metadata_object_application_set_data(metadata[numBlocks], reinterpret_cast<FLAC__byte *>(&chunk), length, true);
numBlocks++;
}
if(metadata[numBlocks] && sample.HasCustomCuePoints())
{
// Store cue points
memcpy(metadata[numBlocks]->data.application.id, "riff", 4);
struct
{
RIFFChunk header;
uint32le numPoints;
WAVCuePoint cues[mpt::array_size<decltype(sample.cues)>::size];
} chunk{};
chunk.header.id = RIFFChunk::idcue_;
chunk.header.length = 4 + sizeof(chunk.cues);
chunk.numPoints = mpt::saturate_cast<uint32>(std::size(sample.cues));
for(uint32 i = 0; i < std::size(sample.cues); i++)
{
chunk.cues[i].ConvertToWAV(i, sample.cues[i]);
}
const uint32 length = sizeof(RIFFChunk) + chunk.header.length;
FLAC__metadata_object_application_set_data(metadata[numBlocks], reinterpret_cast<FLAC__byte *>(&chunk), length, true);
numBlocks++;
}
// FLAC allows a maximum sample rate of 655350 Hz.
// If the real rate is higher, we store it in a Vorbis comment above.
LimitMax(sampleRate, FLAC__MAX_SAMPLE_RATE);
if(!FLAC__format_sample_rate_is_subset(sampleRate))
{
// FLAC only supports 10 Hz granularity for frequencies above 65535 Hz if the streamable subset is chosen.
FLAC__stream_encoder_set_streamable_subset(encoder, false);
}
FLAC__stream_encoder_set_channels(encoder, sample.GetNumChannels());
FLAC__stream_encoder_set_bits_per_sample(encoder, sample.GetElementarySampleSize() * 8);
FLAC__stream_encoder_set_sample_rate(encoder, sampleRate);
FLAC__stream_encoder_set_total_samples_estimate(encoder, sample.nLength);
FLAC__stream_encoder_set_metadata(encoder, metadata.data(), numBlocks);
#ifdef MODPLUG_TRACKER
FLAC__stream_encoder_set_compression_level(encoder, TrackerSettings::Instance().m_FLACCompressionLevel);
#endif // MODPLUG_TRACKER
bool success = FLAC__stream_encoder_init_stream(encoder, &FLAC__StreamEncoder_RAII::StreamEncoderWriteCallback, &FLAC__StreamEncoder_RAII::StreamEncoderSeekCallback, &FLAC__StreamEncoder_RAII::StreamEncoderTellCallback, nullptr, &encoder.f) == FLAC__STREAM_ENCODER_INIT_STATUS_OK;
// Convert and encode sample data
SmpLength framesRemain = sample.nLength, framesRead = 0;
const uint8 numChannels = sample.GetNumChannels();
FLAC__int32 buffer[mpt::IO::BUFFERSIZE_TINY];
while(framesRemain && success)
{
const SmpLength copyFrames = std::min(framesRemain, mpt::saturate_cast<SmpLength>(std::size(buffer) / numChannels));
// First, convert to a 32-bit integer buffer
switch(sample.GetElementarySampleSize())
{
case 1: std::copy(sample.sample8() + framesRead * numChannels, sample.sample8() + (framesRead + copyFrames) * numChannels, std::begin(buffer)); break;
case 2: std::copy(sample.sample16() + framesRead * numChannels, sample.sample16() + (framesRead + copyFrames) * numChannels, std::begin(buffer)); break;
default: MPT_ASSERT_NOTREACHED();
}
// Now do the actual encoding
success = FLAC__stream_encoder_process_interleaved(encoder, buffer, copyFrames) != static_cast<FLAC__bool>(false);
framesRead += copyFrames;
framesRemain -= copyFrames;
}
FLAC__stream_encoder_finish(encoder);
return success;
#else
MPT_UNREFERENCED_PARAMETER(nSample);
MPT_UNREFERENCED_PARAMETER(f);
return false;
#endif // MPT_WITH_FLAC
}
#endif // MODPLUG_NO_FILESAVE
OPENMPT_NAMESPACE_END
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