diff options
Diffstat (limited to 'sound/audiostream.cpp')
| -rw-r--r-- | sound/audiostream.cpp | 196 |
1 files changed, 195 insertions, 1 deletions
diff --git a/sound/audiostream.cpp b/sound/audiostream.cpp index 61a2e778ab..8ea72851e2 100644 --- a/sound/audiostream.cpp +++ b/sound/audiostream.cpp @@ -173,6 +173,162 @@ int LinearMemoryStream<stereo, is16Bit, isUnsigned, isLE>::readBuffer(int16 *buf } + +#pragma mark - +#pragma mark --- LinearDiskStream --- +#pragma mark - + + + +/** + * LinearDiskStream. This can stream linear (PCM) audio from disk. The + * function takes an pointer to an array of LinearDiskStreamAudioBlock which defines the + * start position and length of each block of uncompressed audio in the stream. + */ +template<bool stereo, bool is16Bit, bool isUnsigned, bool isLE> +class LinearDiskStream : public AudioStream { + +// Allow backends to override buffer size +#ifdef CUSTOM_AUDIO_BUFFER_SIZE + static const int32 BUFFER_SIZE = CUSTOM_AUDIO_BUFFER_SIZE; +#else + static const int32 BUFFER_SIZE = 16384; +#endif + +protected: + byte* _buffer; ///< Streaming buffer + const byte *_ptr; ///< Pointer to current position in stream buffer + const int _rate; ///< Sample rate of stream + + int32 _playtime; ///< Calculated total play time + Common::SeekableReadStream *_stream; ///< Stream to read data from + int32 _filePos; ///< Current position in stream + int32 _diskLeft; ///< Samples left in stream in current block not yet read to buffer + int32 _bufferLeft; ///< Samples left in buffer in current block + bool _disposeAfterUse; ///< If true, delete stream object when LinearDiskStream is destructed + + LinearDiskStreamAudioBlock *_audioBlock; ///< Audio block list + int _audioBlockCount; ///< Number of blocks in _audioBlock + int _currentBlock; ///< Current audio block number + + int _beginLoop; ///< Loop parameter, currently not implemented + int _endLoop; ///< Loop parameter, currently not implemented + + +public: + LinearDiskStream(int rate, uint beginLoop, uint endLoop, bool disposeStream, Common::SeekableReadStream *stream, LinearDiskStreamAudioBlock *block, uint numBlocks) + : _rate(rate), _stream(stream), _beginLoop(beginLoop), _endLoop(endLoop), _disposeAfterUse(disposeStream), + _audioBlockCount(numBlocks) { + + // Allocate streaming buffer + if (is16Bit) { + _buffer = (byte *)malloc(BUFFER_SIZE * sizeof(int16)); + } else { + _buffer = (byte *)malloc(BUFFER_SIZE * sizeof(byte)); + } + + _ptr = _buffer; + _bufferLeft = 0; + + // Copy audio block data to our buffer + // TODO: Replace this with a Common::Array or Common::List to + // make it a little friendlier. + _audioBlock = new LinearDiskStreamAudioBlock[numBlocks]; + memcpy(_audioBlock, block, numBlocks * sizeof(LinearDiskStreamAudioBlock)); + + // Set current buffer state, playing first block + _currentBlock = 0; + _filePos = _audioBlock[_currentBlock].pos; + _diskLeft = _audioBlock[_currentBlock].len; + + // Add up length of all blocks in order to caluclate total play time + int len = 0; + for (int r = 0; r < _audioBlockCount; r++) { + len += _audioBlock[r].len; + } + _playtime = calculatePlayTime(rate, len / (is16Bit ? 2 : 1) / (stereo ? 2 : 1)); + } + + + virtual ~LinearDiskStream() { + if (_disposeAfterUse) { + delete _stream; + } + + delete[] _audioBlock; + free(_buffer); + } + int readBuffer(int16 *buffer, const int numSamples); + + bool isStereo() const { return stereo; } + bool endOfData() const { return (_currentBlock == _audioBlockCount - 1) && (_diskLeft == 0) && (_bufferLeft == 0); } + + int getRate() const { return _rate; } + int32 getTotalPlayTime() const { return _playtime; } +}; + +template<bool stereo, bool is16Bit, bool isUnsigned, bool isLE> +int LinearDiskStream<stereo, is16Bit, isUnsigned, isLE>::readBuffer(int16 *buffer, const int numSamples) { + int oldPos = _stream->pos(); + bool restoreFilePosition = false; + + int samples = numSamples; + + while (samples > 0 && ((_diskLeft > 0 || _bufferLeft > 0) || (_currentBlock != _audioBlockCount - 1)) ) { + + // Output samples in the buffer to the output + int len = MIN(samples, _bufferLeft); + samples -= len; + _bufferLeft -= len; + + while (len > 0) { + *buffer++ = READ_ENDIAN_SAMPLE(is16Bit, isUnsigned, _ptr, isLE); + _ptr += (is16Bit ? 2 : 1); + len--; + } + + // Have we now finished this block? If so, read the next block + if ((_bufferLeft == 0) && (_diskLeft == 0) && (_currentBlock != _audioBlockCount - 1)) { + // Next block + _currentBlock++; + + _filePos = _audioBlock[_currentBlock].pos; + _diskLeft = _audioBlock[_currentBlock].len; + } + + + // Now read more data from disk if there is more to be read + if ((_bufferLeft == 0) && (_diskLeft > 0)) { + int32 readAmount = MIN(_diskLeft, BUFFER_SIZE); + + _stream->seek(_filePos, SEEK_SET); + _stream->read(_buffer, readAmount * (is16Bit? 2: 1)); + + // Amount of data in buffer is now the amount read in, and + // the amount left to read on disk is decreased by the same amount + _bufferLeft = readAmount; + _diskLeft -= readAmount; + _ptr = (byte *)_buffer; + _filePos += readAmount * (is16Bit? 2: 1); + + // Set this flag now we've used the file, it restores it's + // original position. + restoreFilePosition = true; + } + } + + // In case calling code relies on the position of this stream staying + // constant, I restore the location if I've changed it. This is probably + // not necessary. + if (restoreFilePosition) { + _stream->seek(oldPos, SEEK_SET); + } + + return numSamples-samples; +} + + + #pragma mark - #pragma mark --- Input stream factory --- #pragma mark - @@ -202,6 +358,7 @@ AudioStream *makeLinearInputStream(const byte *ptr, uint32 len, int rate, byte f const bool isLE = (flags & Audio::Mixer::FLAG_LITTLE_ENDIAN) != 0; const bool autoFree = (flags & Audio::Mixer::FLAG_AUTOFREE) != 0; + uint loopOffset = 0, loopLen = 0; if (flags & Audio::Mixer::FLAG_LOOP) { if (loopEnd == 0) @@ -236,6 +393,44 @@ AudioStream *makeLinearInputStream(const byte *ptr, uint32 len, int rate, byte f } + + + +#define MAKE_LINEAR_DISK(STEREO, UNSIGNED) \ + if (is16Bit) { \ + if (isLE) \ + return new LinearDiskStream<STEREO, true, UNSIGNED, true>(rate, loopStart, loopEnd, takeOwnership, &stream, block, numBlocks); \ + else \ + return new LinearDiskStream<STEREO, true, UNSIGNED, false>(rate, loopStart, loopEnd, takeOwnership, &stream, block, numBlocks); \ + } else \ + return new LinearDiskStream<STEREO, false, UNSIGNED, false>(rate, loopStart, loopEnd, takeOwnership, &stream, block, numBlocks) + + +AudioStream *makeLinearDiskStream(Common::SeekableReadStream& stream, LinearDiskStreamAudioBlock* block, int numBlocks, int rate, byte flags, bool takeOwnership, uint loopStart, uint loopEnd) { + const bool isStereo = (flags & Audio::Mixer::FLAG_STEREO) != 0; + const bool is16Bit = (flags & Audio::Mixer::FLAG_16BITS) != 0; + const bool isUnsigned = (flags & Audio::Mixer::FLAG_UNSIGNED) != 0; + const bool isLE = (flags & Audio::Mixer::FLAG_LITTLE_ENDIAN) != 0; + + + if (isStereo) { + if (isUnsigned) { + MAKE_LINEAR_DISK(true, true); + } else { + MAKE_LINEAR_DISK(true, false); + } + } else { + if (isUnsigned) { + MAKE_LINEAR_DISK(false, true); + } else { + MAKE_LINEAR_DISK(false, false); + } + } +} + + + + #pragma mark - #pragma mark --- Appendable audio stream --- #pragma mark - @@ -306,7 +501,6 @@ BaseAppendableMemoryStream::~BaseAppendableMemoryStream() { template<bool stereo, bool is16Bit, bool isUnsigned, bool isLE> int AppendableMemoryStream<stereo, is16Bit, isUnsigned, isLE>::readBuffer(int16 *buffer, const int numSamples) { Common::StackLock lock(_mutex); - int samples = numSamples; while (samples > 0 && !eosIntern()) { Buffer buf = *_bufferQueue.begin(); |