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Diffstat (limited to 'sound/flac.cpp')
-rw-r--r-- | sound/flac.cpp | 840 |
1 files changed, 840 insertions, 0 deletions
diff --git a/sound/flac.cpp b/sound/flac.cpp new file mode 100644 index 0000000000..ccbc386545 --- /dev/null +++ b/sound/flac.cpp @@ -0,0 +1,840 @@ +/* ScummVM - Scumm Interpreter + * Copyright (C) 2003-2004 The ScummVM project + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version 2 + * of the License, or (at your option) any later version. + + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. + * + * $Header$ + * + */ + +#include "sound/flac.h" + +#ifdef USE_FLAC + +#include "common/file.h" +#include "common/util.h" + +#include "sound/audiostream.h" +#include "sound/audiocd.h" + +#define FLAC__NO_DLL // that MS-magic gave me headaches - just link the library you like +#include <FLAC/seekable_stream_decoder.h> + +#pragma mark - +#pragma mark --- Flac stream --- +#pragma mark - + +static const uint MAX_OUTPUT_CHANNELS = 2; + + +class FlacInputStream : public AudioStream { + +public: + FlacInputStream(File *sourceFile, const uint32 fileStart, const uint32 fileStop); + FlacInputStream(File *sourceFile, const uint32 fileStart = 0); + virtual ~FlacInputStream(); + + int readBuffer(int16 *buffer, const int numSamples); + + bool isStereo() const { return _streaminfo.channels >= 2; } + int getRate() const { return _streaminfo.sample_rate; } + bool endOfStream() const { return _streaminfo.channels == 0 || (_lastSampleWritten && getBufferedSamples() == 0); } + /** the mixer aint supporting it right now.. */ + //bool endOfData() const { return getBufferedSamples() == 0; } + bool endOfData() const { return endOfStream(); } + + uint getChannels() const { return MIN(_streaminfo.channels, MAX_OUTPUT_CHANNELS); } + uint getBufferedSamples() const { return _preBuffer.bufFill; }; + + const FLAC__StreamMetadata_StreamInfo& getStreamInfo() const {return _streaminfo;} + + inline FLAC__SeekableStreamDecoderState getState() const; + inline FLAC__StreamDecoderState getStreamDecoderState() const; + + + bool isStreamDecoderReady() const { return getStreamDecoderState() == FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC ; } + bool init(); + bool finish(); + bool flush(); + inline bool processSingleBlock(); + inline bool processUntilEndOfMetadata(); + bool seekAbsolute(FLAC__uint64 sample); + inline void setLastSample(FLAC__uint64 absoluteSample); + +protected: + inline ::FLAC__SeekableStreamDecoderReadStatus callbackRead(FLAC__byte buffer[], uint *bytes); + inline ::FLAC__SeekableStreamDecoderSeekStatus callbackSeek(FLAC__uint64 absoluteByteOffset); + inline ::FLAC__SeekableStreamDecoderTellStatus callbackTell(FLAC__uint64 *absoluteByteOffset); + inline ::FLAC__SeekableStreamDecoderLengthStatus callbackLength(FLAC__uint64 *streamLength); + inline bool callbackEOF(); + inline ::FLAC__StreamDecoderWriteStatus callbackWrite(const ::FLAC__Frame *frame, const FLAC__int32 * const buffer[]); + inline void callbackMetadata(const ::FLAC__StreamMetadata *metadata); + inline void callbackError(::FLAC__StreamDecoderErrorStatus status); + + ::FLAC__SeekableStreamDecoder *_decoder; + +private: + static ::FLAC__SeekableStreamDecoderReadStatus callWrapRead(const ::FLAC__SeekableStreamDecoder *decoder, FLAC__byte buffer[], uint *bytes, void *clientData); + static ::FLAC__SeekableStreamDecoderSeekStatus callWrapSeek(const ::FLAC__SeekableStreamDecoder *decoder, FLAC__uint64 absoluteByteOffset, void *clientData); + static ::FLAC__SeekableStreamDecoderTellStatus callWrapTell(const ::FLAC__SeekableStreamDecoder *decoder, FLAC__uint64 *absoluteByteOffset, void *clientData); + static ::FLAC__SeekableStreamDecoderLengthStatus callWrapLength(const ::FLAC__SeekableStreamDecoder *decoder, FLAC__uint64 *streamLength, void *clientData); + static FLAC__bool callWrapEOF(const ::FLAC__SeekableStreamDecoder *decoder, void *clientData); + static ::FLAC__StreamDecoderWriteStatus callWrapWrite(const ::FLAC__SeekableStreamDecoder *decoder, const ::FLAC__Frame *frame, const FLAC__int32 * const buffer[], void *clientData); + static void callWrapMetadata(const ::FLAC__SeekableStreamDecoder *decoder, const ::FLAC__StreamMetadata *metadata, void *clientData); + static void callWrapError(const ::FLAC__SeekableStreamDecoder *decoder, ::FLAC__StreamDecoderErrorStatus status, void *clientData); + // Private and undefined so you can't use them: + FlacInputStream(const FlacInputStream &); + void operator=(const FlacInputStream &); + + bool isValid() const { return _decoder != NULL; } + + bool allocateBuffer(uint minSamples); + inline void flushBuffer(); + inline void deleteBuffer(); + + /** Header of the Stream */ + FLAC__StreamMetadata_StreamInfo _streaminfo; + + struct { + /** Handle to the File */ + File *fileHandle; + /** Index of next Byte to read */ + uint32 filePos; + /** start of stream - not necessary start of file */ + uint32 fileStartPos; + /** last index of Stream + 1(!) - not necessary end of file */ + uint32 fileEndPos; + } _fileInfo; + + /** index of the first Sample to be played */ + FLAC__uint64 _firstSample; + /** index + 1(!) of the last Sample to be played - 0 is end of Stream*/ + FLAC__uint64 _lastSample; + + /** true if the last Sample was decoded from the FLAC-API - there might still be data in the buffer */ + bool _lastSampleWritten; + + typedef int16 bufType; + enum { BUFTYPE_BITS = 16 }; + + struct { + bufType *bufData; + bufType *bufReadPos; + uint bufSize; + uint bufFill; + } _preBuffer; + + bufType *_outBuffer; + uint _requestedSamples; + + void setBestConvertBufferMethod(); + typedef void (*PFCONVERTBUFFERS)(bufType*,const FLAC__int32*[], uint, const uint, const uint8); + PFCONVERTBUFFERS _methodConvertBuffers; + static void convertBuffersGeneric(bufType* bufDestination, const FLAC__int32 *inChannels[], uint numSamples, const uint numChannels, const uint8 numBits); + static void convertBuffersStereoNS(bufType* bufDestination, const FLAC__int32 *inChannels[], uint numSamples, const uint numChannels, const uint8 numBits); + static void convertBuffersStereo8Bit(bufType* bufDestination, const FLAC__int32 *inChannels[], uint numSamples, const uint numChannels, const uint8 numBits); + static void convertBuffersMonoNS(bufType* bufDestination, const FLAC__int32 *inChannels[], uint numSamples, const uint numChannels, const uint8 numBits); + static void convertBuffersMono8Bit(bufType* bufDestination, const FLAC__int32 *inChannels[], uint numSamples, const uint numChannels, const uint8 numBits); +}; + +FlacInputStream::FlacInputStream(File *sourceFile, const uint32 fileStart) + : _decoder(::FLAC__seekable_stream_decoder_new()), _firstSample(0), _lastSample(0), + _outBuffer(NULL), _requestedSamples(0), _lastSampleWritten(true), + _methodConvertBuffers(&FlacInputStream::convertBuffersGeneric) +{ + assert(sourceFile != NULL && sourceFile->isOpen()); + + memset(&_streaminfo, 0, sizeof(_streaminfo)); + + _preBuffer.bufData = NULL; + _preBuffer.bufFill = 0; + _preBuffer.bufSize = 0; + + _fileInfo.fileHandle = sourceFile; + _fileInfo.fileStartPos = fileStart; + _fileInfo.filePos = fileStart; + _fileInfo.fileEndPos = sourceFile->size(); +} + +FlacInputStream::FlacInputStream(File *sourceFile, const uint32 fileStart, const uint32 fileStop) + : _decoder(::FLAC__seekable_stream_decoder_new()), _firstSample(0), _lastSample(0), + _outBuffer(NULL), _requestedSamples(0), _lastSampleWritten(true), + _methodConvertBuffers(&FlacInputStream::convertBuffersGeneric) +{ + assert(sourceFile != NULL && sourceFile->isOpen()); + assert(fileStop <= 0 || (fileStart < fileStop && fileStop <= sourceFile->size())); + + memset(&_streaminfo, 0, sizeof(_streaminfo)); + + _preBuffer.bufData = NULL; + _preBuffer.bufFill = 0; + _preBuffer.bufSize = 0; + + _fileInfo.fileHandle = sourceFile; + _fileInfo.fileStartPos = fileStart; + _fileInfo.filePos = fileStart; + _fileInfo.fileEndPos = fileStop; +} + +FlacInputStream::~FlacInputStream() { + if (_decoder != NULL) { + (void) ::FLAC__seekable_stream_decoder_finish(_decoder); + ::FLAC__seekable_stream_decoder_delete(_decoder); + } + if (_preBuffer.bufData != NULL) + delete[] _preBuffer.bufData; +} + +inline FLAC__SeekableStreamDecoderState FlacInputStream::getState() const { + assert(isValid()); + return ::FLAC__seekable_stream_decoder_get_state(_decoder); +} + +inline FLAC__StreamDecoderState FlacInputStream::getStreamDecoderState() const { + assert(isValid()); + return ::FLAC__seekable_stream_decoder_get_stream_decoder_state(_decoder); +} + +bool FlacInputStream::init() { + assert(isValid()); + + memset(&_streaminfo, 0, sizeof (_streaminfo)); + deleteBuffer(); + _fileInfo.filePos = _fileInfo.fileStartPos; + _lastSampleWritten = false; + _methodConvertBuffers = &FlacInputStream::convertBuffersGeneric; + + ::FLAC__seekable_stream_decoder_set_read_callback(_decoder, &FlacInputStream::callWrapRead); + ::FLAC__seekable_stream_decoder_set_seek_callback(_decoder, &FlacInputStream::callWrapSeek); + ::FLAC__seekable_stream_decoder_set_tell_callback(_decoder, &FlacInputStream::callWrapTell); + ::FLAC__seekable_stream_decoder_set_length_callback(_decoder, &FlacInputStream::callWrapLength); + ::FLAC__seekable_stream_decoder_set_eof_callback(_decoder, &FlacInputStream::callWrapEOF); + ::FLAC__seekable_stream_decoder_set_write_callback(_decoder, &FlacInputStream::callWrapWrite); + ::FLAC__seekable_stream_decoder_set_metadata_callback(_decoder, &FlacInputStream::callWrapMetadata); + ::FLAC__seekable_stream_decoder_set_error_callback(_decoder, &FlacInputStream::callWrapError); + ::FLAC__seekable_stream_decoder_set_client_data(_decoder, (void*)this); + + if (::FLAC__seekable_stream_decoder_init(_decoder) == FLAC__SEEKABLE_STREAM_DECODER_OK) { + if (processUntilEndOfMetadata() && _streaminfo.channels > 0) { + if (_firstSample == 0 || 0 != ::FLAC__seekable_stream_decoder_seek_absolute(_decoder, _firstSample)) { + // FLAC__StreamDecoderState state = getStreamDecoderState(); + return true; // no error occured + } + } + } + + warning("FlacInputStream: could not create an Audiostream from File %s", _fileInfo.fileHandle->name()); + return false; +} + +bool FlacInputStream::finish() { + assert(isValid()); + deleteBuffer(); + return 0 != ::FLAC__seekable_stream_decoder_finish(_decoder); +} + +bool FlacInputStream::flush() { + assert(isValid()); + flushBuffer(); + return 0 != ::FLAC__seekable_stream_decoder_flush(_decoder); +} + +inline bool FlacInputStream::processSingleBlock() { + assert(isValid()); + return 0 != ::FLAC__seekable_stream_decoder_process_single(_decoder); +} + +inline bool FlacInputStream::processUntilEndOfMetadata() { + assert(isValid()); + return 0 != ::FLAC__seekable_stream_decoder_process_until_end_of_metadata(_decoder); +} + +bool FlacInputStream::seekAbsolute(FLAC__uint64 sample) { + assert(isValid()); + const bool result = (0 != ::FLAC__seekable_stream_decoder_seek_absolute(_decoder, sample)); + if (result) { + flushBuffer(); + _lastSampleWritten = (_lastSample != 0 && sample >= _lastSample); // only set if we are SURE + } + return result; +} + +int FlacInputStream::readBuffer(int16 *buffer, const int numSamples) { + const uint kNumChannels = getChannels(); + + if (kNumChannels == 0) { + warning("FlacInputStream: Stream not sucessfully initialised, cant playback"); + return -1; // streaminfo wasnt read! + } + + assert(numSamples % kNumChannels == 0); // must be multiple of channels! + assert(buffer != NULL); + assert(_outBuffer == NULL); + assert(_requestedSamples == 0); + + _outBuffer = buffer; + _requestedSamples = numSamples; + + if (_preBuffer.bufFill > 0) { + assert(_preBuffer.bufData != NULL && _preBuffer.bufReadPos != NULL && _preBuffer.bufSize > 0); + assert(_preBuffer.bufReadPos >= _preBuffer.bufData); + assert(_preBuffer.bufFill % kNumChannels == 0); + + const uint copySamples = MIN((uint)numSamples, _preBuffer.bufFill); + memcpy(buffer, _preBuffer.bufReadPos, copySamples*sizeof(buffer[0])); + + _outBuffer = buffer + copySamples; + _requestedSamples = numSamples - copySamples; + _preBuffer.bufReadPos += copySamples; + _preBuffer.bufFill -= copySamples; + } + + bool decoderOk = true; + + if (!_lastSampleWritten) { + FLAC__StreamDecoderState state = getStreamDecoderState(); + + for (; _requestedSamples > 0 && state == FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC; state = getStreamDecoderState()) { + assert(_preBuffer.bufFill == 0); + assert(_requestedSamples % kNumChannels == 0); + processSingleBlock(); + } + + if (state != FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC) { + switch (state) { + case FLAC__STREAM_DECODER_END_OF_STREAM : + _lastSampleWritten = true; + decoderOk = true; // no REAL error + break; + + default: + decoderOk = false; + warning("FlacInputStream: An error occured while decoding. DecoderState is: %s", + FLAC__StreamDecoderStateString[getStreamDecoderState()]); + } + } + } + + const int samples = (int)(_outBuffer - buffer); + assert(samples % kNumChannels == 0); + + _outBuffer = NULL; // basically unnessecary, only for the purpose of the asserts + _requestedSamples = 0; // basically unnessecary, only for the purpose of the asserts + + return decoderOk ? samples : -1; +} + +inline ::FLAC__SeekableStreamDecoderReadStatus FlacInputStream::callbackRead(FLAC__byte buffer[], uint *bytes) { + assert(_fileInfo.fileHandle != NULL); + + if (*bytes == 0) + return FLAC__SEEKABLE_STREAM_DECODER_READ_STATUS_ERROR; /* abort to avoid a deadlock */ + + const uint32 length = MIN(_fileInfo.fileEndPos - _fileInfo.filePos, static_cast<uint32>(*bytes)); + + _fileInfo.fileHandle->seek(_fileInfo.filePos); + const uint32 bytesRead = _fileInfo.fileHandle->read(buffer, length); + + if (bytesRead == 0 && _fileInfo.fileHandle->ioFailed()) + return FLAC__SEEKABLE_STREAM_DECODER_READ_STATUS_ERROR; + + _fileInfo.filePos += bytesRead; + *bytes = static_cast<uint>(bytesRead); + return FLAC__SEEKABLE_STREAM_DECODER_READ_STATUS_OK; +} + +inline void FlacInputStream::setLastSample(FLAC__uint64 absoluteSample) { + if (_lastSampleWritten && absoluteSample > _lastSample) + _lastSampleWritten = false; + _lastSample = absoluteSample; +} + +inline void FlacInputStream::flushBuffer() { + _lastSampleWritten = _lastSampleWritten && _preBuffer.bufFill == 0; + _preBuffer.bufFill = 0; +} + +inline void FlacInputStream::deleteBuffer() { + flushBuffer(); + _preBuffer.bufSize = 0; + if (_preBuffer.bufData != NULL) { + delete[] _preBuffer.bufData; + _preBuffer.bufData = NULL; + } +} + +bool FlacInputStream::allocateBuffer(uint minSamples) { + uint allocateSize = minSamples / getChannels(); + /** insert funky algorythm for optimum buffersize here */ + allocateSize = MIN(_streaminfo.max_blocksize, MAX(_streaminfo.min_blocksize, allocateSize)); + allocateSize += 8 - (allocateSize % 8); // make sure its an nice even amount + allocateSize *= getChannels(); + + deleteBuffer(); + + _preBuffer.bufData = new bufType[allocateSize]; + if (_preBuffer.bufData != NULL) { + _preBuffer.bufSize = allocateSize; + return true; + } + return false; +} + +void FlacInputStream::setBestConvertBufferMethod() +{ + PFCONVERTBUFFERS tempMethod = &FlacInputStream::convertBuffersGeneric; + + const uint kNumChannels = getChannels(); + const uint8 kNumBits = (uint8)_streaminfo.bits_per_sample; + + assert(kNumChannels >= 1); + assert(kNumBits >= 4 && kNumBits <=32); + + if (kNumChannels == 1) { + if (kNumBits == 8) + tempMethod = &FlacInputStream::convertBuffersMono8Bit; + if (kNumBits == BUFTYPE_BITS) + tempMethod = &FlacInputStream::convertBuffersMonoNS; + } else if (kNumChannels == 2) { + if (kNumBits == 8) + tempMethod = &FlacInputStream::convertBuffersStereo8Bit; + if (kNumBits == BUFTYPE_BITS) + tempMethod = &FlacInputStream::convertBuffersStereoNS; + } /* else ... */ + + _methodConvertBuffers = tempMethod; +} + +// 1 channel, no scaling +void FlacInputStream::convertBuffersMonoNS(bufType* bufDestination, const FLAC__int32 *inChannels[], uint numSamples, const uint numChannels, const uint8 numBits) +{ + assert(numChannels == 1); + assert(numBits == BUFTYPE_BITS); + + FLAC__int32 const* inChannel1 = inChannels[0]; + + while (numSamples >= 4) { + bufDestination[0] = static_cast<bufType>(inChannel1[0]); + bufDestination[1] = static_cast<bufType>(inChannel1[1]); + bufDestination[2] = static_cast<bufType>(inChannel1[2]); + bufDestination[3] = static_cast<bufType>(inChannel1[3]); + bufDestination += 4; + inChannel1 += 4; + numSamples -= 4; + } + + for (; numSamples > 0; --numSamples) { + *bufDestination++ = static_cast<bufType>(*inChannel1++); + } + + inChannels[0] = inChannel1; + assert(numSamples == 0); // dint copy too many samples +} + +// 1 channel, scaling from 8Bit +void FlacInputStream::convertBuffersMono8Bit(bufType* bufDestination, const FLAC__int32 *inChannels[], uint numSamples, const uint numChannels, const uint8 numBits) +{ + assert(numChannels == 1); + assert(numBits == 8); + assert(8 < BUFTYPE_BITS); + + FLAC__int32 const* inChannel1 = inChannels[0]; + + while (numSamples >= 4) { + bufDestination[0] = static_cast<bufType>(inChannel1[0]) << (BUFTYPE_BITS - 8); + bufDestination[1] = static_cast<bufType>(inChannel1[1]) << (BUFTYPE_BITS - 8); + bufDestination[2] = static_cast<bufType>(inChannel1[2]) << (BUFTYPE_BITS - 8); + bufDestination[3] = static_cast<bufType>(inChannel1[3]) << (BUFTYPE_BITS - 8); + bufDestination += 4; + inChannel1 += 4; + numSamples -= 4; + } + + for (; numSamples > 0; --numSamples) { + *bufDestination++ = static_cast<bufType>(*inChannel1++) << (BUFTYPE_BITS - 8); + } + + inChannels[0] = inChannel1; + assert(numSamples == 0); // dint copy too many samples +} + +// 2 channels, no scaling +void FlacInputStream::convertBuffersStereoNS(bufType* bufDestination, const FLAC__int32 *inChannels[], uint numSamples, const uint numChannels, const uint8 numBits) +{ + assert(numChannels == 2); + assert(numBits == BUFTYPE_BITS); + assert(numSamples % 2 == 0); // must be integral multiply of channels + + + FLAC__int32 const* inChannel1 = inChannels[0]; // Left Channel + FLAC__int32 const* inChannel2 = inChannels[1]; // Right Channel + + while (numSamples >= 2*2) { + bufDestination[0] = static_cast<bufType>(inChannel1[0]); + bufDestination[1] = static_cast<bufType>(inChannel2[0]); + bufDestination[2] = static_cast<bufType>(inChannel1[1]); + bufDestination[3] = static_cast<bufType>(inChannel2[1]); + bufDestination += 2 * 2; + inChannel1 += 2; + inChannel2 += 2; + numSamples -= 2 * 2; + } + + while (numSamples > 0) { + bufDestination[0] = static_cast<bufType>(*inChannel1++); + bufDestination[1] = static_cast<bufType>(*inChannel2++); + bufDestination += 2; + numSamples -= 2; + } + + inChannels[0] = inChannel1; + inChannels[1] = inChannel2; + assert(numSamples == 0); // dint copy too many samples +} + +// 2 channels, scaling from 8Bit +void FlacInputStream::convertBuffersStereo8Bit(bufType* bufDestination, const FLAC__int32 *inChannels[], uint numSamples, const uint numChannels, const uint8 numBits) +{ + assert(numChannels == 2); + assert(numBits == 8); + assert(numSamples % 2 == 0); // must be integral multiply of channels + assert(8 < BUFTYPE_BITS); + + FLAC__int32 const* inChannel1 = inChannels[0]; // Left Channel + FLAC__int32 const* inChannel2 = inChannels[1]; // Right Channel + + while (numSamples >= 2*2) { + bufDestination[0] = static_cast<bufType>(inChannel1[0]) << (BUFTYPE_BITS - 8); + bufDestination[1] = static_cast<bufType>(inChannel2[0]) << (BUFTYPE_BITS - 8); + bufDestination[2] = static_cast<bufType>(inChannel1[1]) << (BUFTYPE_BITS - 8); + bufDestination[3] = static_cast<bufType>(inChannel2[1]) << (BUFTYPE_BITS - 8); + bufDestination += 2 * 2; + inChannel1 += 2; + inChannel2 += 2; + numSamples -= 2 * 2; + } + + while (numSamples > 0) { + bufDestination[0] = static_cast<bufType>(*inChannel1++) << (BUFTYPE_BITS - 8); + bufDestination[1] = static_cast<bufType>(*inChannel2++) << (BUFTYPE_BITS - 8); + bufDestination += 2; + numSamples -= 2; + } + + inChannels[0] = inChannel1; + inChannels[1] = inChannel2; + assert(numSamples == 0); // dint copy too many samples +} + +// all Purpose-conversion - slowest of em all +void FlacInputStream::convertBuffersGeneric(bufType* bufDestination, const FLAC__int32 *inChannels[], uint numSamples, const uint numChannels, const uint8 numBits) +{ + assert(numSamples % numChannels == 0); // must be integral multiply of channels + + if (numBits < BUFTYPE_BITS) { + const uint8 kPower = (uint8)(BUFTYPE_BITS - numBits); + + for (; numSamples > 0; numSamples -= numChannels) { + for (uint i = 0; i < numChannels; ++i) + *bufDestination++ = static_cast<bufType>(*(inChannels[i]++)) << kPower; + } + } else if (numBits > BUFTYPE_BITS) { + const uint8 kPower = (uint8)(numBits - BUFTYPE_BITS); + + for (; numSamples > 0; numSamples -= numChannels) { + for (uint i = 0; i < numChannels; ++i) + *bufDestination++ = static_cast<bufType>(*(inChannels[i]++) >> kPower) ; + } + } else { + for (; numSamples > 0; numSamples -= numChannels) { + for (uint i = 0; i < numChannels; ++i) + *bufDestination++ = static_cast<bufType>(*(inChannels[i]++)); + } + } + + assert(numSamples == 0); // dint copy too many samples +} + +inline ::FLAC__StreamDecoderWriteStatus FlacInputStream::callbackWrite(const ::FLAC__Frame *frame, const FLAC__int32 * const buffer[]) { + assert(frame->header.channels == _streaminfo.channels); + assert(frame->header.sample_rate == _streaminfo.sample_rate); + assert(frame->header.bits_per_sample == _streaminfo.bits_per_sample); + assert(frame->header.number_type == FLAC__FRAME_NUMBER_TYPE_SAMPLE_NUMBER || _streaminfo.min_blocksize == _streaminfo.max_blocksize); + + assert(_preBuffer.bufFill == 0); // we dont append data + + uint nSamples = frame->header.blocksize; + const uint kNumChannels = getChannels(); + const uint8 kNumBits = (uint8)_streaminfo.bits_per_sample; + + assert(_requestedSamples % kNumChannels == 0); // must be integral multiply of channels + + const FLAC__uint64 firstSampleNumber = (frame->header.number_type == FLAC__FRAME_NUMBER_TYPE_SAMPLE_NUMBER) ? + frame->header.number.sample_number : (static_cast<FLAC__uint64>(frame->header.number.frame_number)) * _streaminfo.max_blocksize; + + if (_lastSample != 0 && firstSampleNumber + nSamples >= _lastSample) { + nSamples = (uint)(firstSampleNumber >= _lastSample ? 0 : _lastSample - firstSampleNumber); + _requestedSamples = MIN(_requestedSamples, nSamples * kNumChannels); + _lastSampleWritten = true; + } + + nSamples *= kNumChannels; + + const FLAC__int32 *inChannels[MAX_OUTPUT_CHANNELS] = { buffer[0] }; // one channel is a given... + for (uint i = 1; i < kNumChannels; ++i) + inChannels[i] = buffer[i]; + + + // writing DIRECTLY to the Buffer ScummVM provided + if (_requestedSamples > 0) { + assert(_requestedSamples % kNumChannels == 0); // must be integral multiply of channels + assert(_outBuffer != NULL); + + const uint copySamples = MIN(_requestedSamples,nSamples); + (*_methodConvertBuffers)(_outBuffer, inChannels, copySamples, kNumChannels, kNumBits); + + _requestedSamples -= copySamples; + nSamples -= copySamples; + _outBuffer += copySamples; + } + + // checking if Buffer fits + if (_preBuffer.bufSize < nSamples) { + if (!allocateBuffer(nSamples)) + return FLAC__STREAM_DECODER_WRITE_STATUS_ABORT; + } // optional check if buffer is wasting too much memory ? + + (*_methodConvertBuffers)(_preBuffer.bufData, inChannels, nSamples, kNumChannels, kNumBits); + + _preBuffer.bufFill = nSamples; + _preBuffer.bufReadPos = _preBuffer.bufData; + + return FLAC__STREAM_DECODER_WRITE_STATUS_CONTINUE; +} + +inline ::FLAC__SeekableStreamDecoderSeekStatus FlacInputStream::callbackSeek(FLAC__uint64 absoluteByteOffset) { + FLAC__uint64 newPos = absoluteByteOffset + _fileInfo.fileStartPos; + const bool result = (newPos < _fileInfo.fileEndPos); + + if (result) + _fileInfo.filePos = static_cast<uint32>(newPos); + + return result ? FLAC__SEEKABLE_STREAM_DECODER_SEEK_STATUS_OK : FLAC__SEEKABLE_STREAM_DECODER_SEEK_STATUS_ERROR; + +} + +inline ::FLAC__SeekableStreamDecoderTellStatus FlacInputStream::callbackTell(FLAC__uint64 *absoluteByteOffset) { + /*if () + return FLAC__SEEKABLE_STREAM_DECODER_TELL_STATUS_ERROR;*/ + *absoluteByteOffset = static_cast<FLAC__uint64>(_fileInfo.filePos-_fileInfo.fileStartPos); + return FLAC__SEEKABLE_STREAM_DECODER_TELL_STATUS_OK; +} + +inline ::FLAC__SeekableStreamDecoderLengthStatus FlacInputStream::callbackLength(FLAC__uint64 *streamLength) { + if (_fileInfo.fileStartPos > _fileInfo.fileEndPos) + return FLAC__SEEKABLE_STREAM_DECODER_LENGTH_STATUS_ERROR; + + *streamLength = static_cast<FLAC__uint64>(_fileInfo.fileEndPos - _fileInfo.fileStartPos); + return FLAC__SEEKABLE_STREAM_DECODER_LENGTH_STATUS_OK; +} + +inline bool FlacInputStream::callbackEOF() { + return _fileInfo.filePos >= _fileInfo.fileEndPos; +} + + +inline void FlacInputStream::callbackMetadata(const ::FLAC__StreamMetadata *metadata) { + assert(isValid()); + assert(metadata->type == FLAC__METADATA_TYPE_STREAMINFO); // others arent really interesting + + _streaminfo = metadata->data.stream_info; + setBestConvertBufferMethod(); // should be set after getting stream-information. FLAC always parses the info first +} +inline void FlacInputStream::callbackError(::FLAC__StreamDecoderErrorStatus status) { + // some of these are non-critical-Errors + debug(1, "FlacInputStream: An error occured while decoding. DecoderState is: %s", + FLAC__StreamDecoderErrorStatusString[status]); +} + +/* Static Callback Wrappers */ +::FLAC__SeekableStreamDecoderReadStatus FlacInputStream::callWrapRead(const ::FLAC__SeekableStreamDecoder *decoder, FLAC__byte buffer[], uint *bytes, void *clientData) { + assert(0 != clientData); + FlacInputStream *instance = reinterpret_cast<FlacInputStream *>(clientData); + assert(0 != instance); + return instance->callbackRead(buffer, bytes); +} + +::FLAC__SeekableStreamDecoderSeekStatus FlacInputStream::callWrapSeek(const ::FLAC__SeekableStreamDecoder *decoder, FLAC__uint64 absoluteByteOffset, void *clientData) { + assert(0 != clientData); + FlacInputStream *instance = reinterpret_cast<FlacInputStream *>(clientData); + assert(0 != instance); + return instance->callbackSeek(absoluteByteOffset); +} + +::FLAC__SeekableStreamDecoderTellStatus FlacInputStream::callWrapTell(const ::FLAC__SeekableStreamDecoder *decoder, FLAC__uint64 *absoluteByteOffset, void *clientData) { + assert(0 != clientData); + FlacInputStream *instance = reinterpret_cast<FlacInputStream *>(clientData); + assert(0 != instance); + return instance->callbackTell(absoluteByteOffset); +} + +::FLAC__SeekableStreamDecoderLengthStatus FlacInputStream::callWrapLength(const ::FLAC__SeekableStreamDecoder *decoder, FLAC__uint64 *streamLength, void *clientData) { + assert(0 != clientData); + FlacInputStream *instance = reinterpret_cast<FlacInputStream *>(clientData); + assert(0 != instance); + return instance->callbackLength(streamLength); +} + +FLAC__bool FlacInputStream::callWrapEOF(const ::FLAC__SeekableStreamDecoder *decoder, void *clientData) { + assert(0 != clientData); + FlacInputStream *instance = reinterpret_cast<FlacInputStream *>(clientData); + assert(0 != instance); + return instance->callbackEOF(); +} + +::FLAC__StreamDecoderWriteStatus FlacInputStream::callWrapWrite(const ::FLAC__SeekableStreamDecoder *decoder, const ::FLAC__Frame *frame, const FLAC__int32 * const buffer[], void *clientData) { + assert(0 != clientData); + FlacInputStream *instance = reinterpret_cast<FlacInputStream *>(clientData); + assert(0 != instance); + return instance->callbackWrite(frame, buffer); +} + +void FlacInputStream::callWrapMetadata(const ::FLAC__SeekableStreamDecoder *decoder, const ::FLAC__StreamMetadata *metadata, void *clientData) { + assert(0 != clientData); + FlacInputStream *instance = reinterpret_cast<FlacInputStream *>(clientData); + assert(0 != instance); + instance->callbackMetadata(metadata); +} + +void FlacInputStream::callWrapError(const ::FLAC__SeekableStreamDecoder *decoder, ::FLAC__StreamDecoderErrorStatus status, void *clientData) { + assert(0 != clientData); + FlacInputStream *instance = reinterpret_cast<FlacInputStream *>(clientData); + assert(0 != instance); + instance->callbackError(status); +} + + +#pragma mark - +#pragma mark --- Flac Audio CD emulation --- +#pragma mark - + + +class FlacTrackInfo : public DigitalTrackInfo { +private: + File *_file; + FlacInputStream *_firstStream; // avoid having to open the Stream twice the first time + +public: + FlacTrackInfo(File *file); + ~FlacTrackInfo(); + bool error() { return _file == NULL; } + void play(SoundMixer *mixer, PlayingSoundHandle *handle, int startFrame, int duration); +}; + +FlacTrackInfo::FlacTrackInfo(File *file) : _file(NULL), _firstStream(NULL) +{ + FlacInputStream *tempStream = new FlacInputStream(file); + /* first time the file will be tested, but not used */ + if (tempStream->init()) { + _firstStream = tempStream; + _file = file; + } else + delete tempStream; +} + +void FlacTrackInfo::play(SoundMixer *mixer, PlayingSoundHandle *handle, int startFrame, int duration) { + if (error()) { + debug(1, "FlacTrackInfo::play: invalid state, method should not been called"); + } + + FlacInputStream *flac; + + if (_firstStream != NULL) { + flac = _firstStream; + _firstStream = NULL; + } else { + flac = new FlacInputStream(_file); + flac->init(); + } + + if (flac->isStreamDecoderReady()) { + const FLAC__StreamMetadata_StreamInfo &info = flac->getStreamInfo(); + flac->setLastSample(static_cast<FLAC__uint64>(startFrame + duration) * (info.sample_rate / 75)); + + if (flac->seekAbsolute(static_cast<FLAC__uint64>(startFrame) * (info.sample_rate / 75))) { + mixer->playInputStream(handle, flac, true); + return; + } + // startSample is beyond the existing Samples + debug(1, "FlacTrackInfo: Audiostream %s coud not seek to frame %d (ca %d secs)", _file->name(), startFrame, startFrame/75); + flac->finish(); + } + delete flac; +} + +FlacTrackInfo::~FlacTrackInfo() +{ + if (_firstStream) + delete _firstStream; + if (_file) + delete _file; +} + +DigitalTrackInfo* getFlacTrack(int track) +{ + assert(track >=1); + char track_name[32]; + File *file = new File(); + + sprintf(track_name, "track%d.flac", track); + file->open(track_name); + + if (file->isOpen()) { + FlacTrackInfo *trackInfo = new FlacTrackInfo(file); + if (!trackInfo->error()) + return trackInfo; + delete trackInfo; + } + + sprintf(track_name, "track%d.fla", track); + file->open(track_name); + + if (file->isOpen()) { + FlacTrackInfo *trackInfo = new FlacTrackInfo(file); + if (!trackInfo->error()) + return trackInfo; + delete trackInfo; + } + + + delete file; + return NULL; +} + +AudioStream *makeFlacStream(File *file, uint32 length) +{ + assert(file != NULL); + uint32 start = file->pos(); + + FlacInputStream *flac = new FlacInputStream(file, start, start + length); + if (flac->init()) + return flac; + + delete flac; + return NULL; +} + + +#endif // #ifdef USE_FLAC |