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Fix invalid sample position on Timestamp to sample conversion for Stereo streams.

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svn-id: r47591
This commit is contained in:
Johannes Schickel 2010-01-27 08:08:33 +00:00
parent 9f2a619c06
commit 812603e29e
6 changed files with 30 additions and 27 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
engines/kyra/sound_digital.cpp
View File

@ -356,7 +356,7 @@ int AUDStream::readChunk(int16 *buffer, const int maxSamples) {
}
bool AUDStream::seek(const Audio::Timestamp &where) {
const uint32 seekSample = Audio::calculateSampleOffset(where, getRate());
const uint32 seekSample = Audio::convertTimeToStreamPos(where, getRate(), isStereo()).totalNumberOfFrames();
_stream->seek(_streamStart);
_processedSize = 0;

21
sound/audiostream.cpp
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@ -164,8 +164,8 @@ SubLoopingAudioStream::SubLoopingAudioStream(SeekableAudioStream *stream,
DisposeAfterUse::Flag disposeAfterUse)
: _parent(stream), _disposeAfterUse(disposeAfterUse), _loops(loops),
_pos(0, getRate() * (isStereo() ? 2 : 1)),
_loopStart(loopStart.convertToFramerate(getRate() * (isStereo() ? 2 : 1))),
_loopEnd(loopEnd.convertToFramerate(getRate() * (isStereo() ? 2 : 1))),
_loopStart(convertTimeToStreamPos(loopStart, getRate(), isStereo())),
_loopEnd(convertTimeToStreamPos(loopEnd, getRate(), isStereo())),
_done(false) {
if (!_parent->rewind())
_done = true;
@ -212,9 +212,9 @@ int SubLoopingAudioStream::readBuffer(int16 *buffer, const int numSamples) {
SubSeekableAudioStream::SubSeekableAudioStream(SeekableAudioStream *parent, const Timestamp start, const Timestamp end, DisposeAfterUse::Flag disposeAfterUse)
: _parent(parent), _disposeAfterUse(disposeAfterUse),
_start(start.convertToFramerate(getRate())),
_start(convertTimeToStreamPos(start, getRate(), isStereo())),
_pos(0, getRate() * (isStereo() ? 2 : 1)),
_length((end - start).convertToFramerate(getRate() * (isStereo() ? 2 : 1))) {
_length(convertTimeToStreamPos(end - start, getRate(), isStereo())) {
assert(_length.totalNumberOfFrames() % (isStereo() ? 2 : 1) == 0);
_parent->seek(_start);
@ -233,7 +233,7 @@ int SubSeekableAudioStream::readBuffer(int16 *buffer, const int numSamples) {
}
bool SubSeekableAudioStream::seek(const Timestamp &where) {
_pos = where.convertToFramerate(getRate());
_pos = convertTimeToStreamPos(where, getRate(), isStereo());
if (_pos > _length) {
_pos = _length;
return false;
@ -364,4 +364,15 @@ QueuingAudioStream *makeQueuingAudioStream(int rate, bool stereo) {
return new QueuingAudioStreamImpl(rate, stereo);
}
Timestamp convertTimeToStreamPos(const Timestamp &where, int rate, bool isStereo) {
Timestamp result(where.convertToFramerate(rate * (isStereo ? 2 : 1)));
// When the Stream is a stereo stream, we have to assure
// that the sample position is an even number.
if (isStereo && (result.totalNumberOfFrames() & 1))
return result.addFrames(-1); // We cut off one sample here.
else
return result;
}
} // End of namespace Audio

19
sound/audiostream.h
View File

@ -162,9 +162,9 @@ public:
* Tries to load a file by trying all available formats.
* In case of an error, the file handle will be closed, but deleting
* it is still the responsibility of the caller.
* @param basename a filename without an extension
* @return an SeekableAudioStream ready to use in case of success;
* NULL in case of an error (e.g. invalid/nonexisting file)
* @param basename a filename without an extension
* @return an SeekableAudioStream ready to use in case of success;
* NULL in case of an error (e.g. invalid/nonexisting file)
*/
static SeekableAudioStream *openStreamFile(const Common::String &basename);
@ -337,16 +337,15 @@ public:
*/
QueuingAudioStream *makeQueuingAudioStream(int rate, bool stereo);
/**
* Calculates the sample, which the timestamp describes in a
* AudioStream with the given framerate.
* Converts a point in time to a precise sample offset
* with the given parameters.
*
* @param where point in time
* @param rate rate of the AudioStream
* @return sample index
* @param where Point in time.
* @param rate Rate of the stream.
* @param isStereo Is the stream a stereo stream?
*/
uint32 calculateSampleOffset(const Timestamp &where, int rate);
Timestamp convertTimeToStreamPos(const Timestamp &where, int rate, bool isStereo);
} // End of namespace Audio

2
sound/decoders/flac.cpp
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@ -294,7 +294,7 @@ bool FlacInputStream::seekAbsolute(FLAC__uint64 sample) {
bool FlacInputStream::seek(const Timestamp &where) {
_sampleCache.bufFill = 0;
_sampleCache.bufReadPos = NULL;
return seekAbsolute((FLAC__uint64)calculateSampleOffset(where, _streaminfo.sample_rate));
return seekAbsolute((FLAC__uint64)convertTimeToStreamPos(where, getRate(), isStereo()).totalNumberOfFrames());
}
int FlacInputStream::readBuffer(int16 *buffer, const int numSamples) {

11
sound/decoders/raw.cpp
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@ -41,13 +41,6 @@ namespace Audio {
((is16Bit ? (isLE ? READ_LE_UINT16(ptr) : READ_BE_UINT16(ptr)) : (*ptr << 8)) ^ (isUnsigned ? 0x8000 : 0))
// TODO: Get rid of this
uint32 calculateSampleOffset(const Timestamp &where, int rate) {
return where.convertToFramerate(rate).totalNumberOfFrames();
}
#pragma mark -
#pragma mark --- RawMemoryStream ---
#pragma mark -
@ -110,7 +103,7 @@ int RawMemoryStream<stereo, is16Bit, isUnsigned, isLE>::readBuffer(int16 *buffer
template<bool stereo, bool is16Bit, bool isUnsigned, bool isLE>
bool RawMemoryStream<stereo, is16Bit, isUnsigned, isLE>::seek(const Timestamp &where) {
const uint8 *ptr = _origPtr + calculateSampleOffset(where, getRate()) * (is16Bit ? 2 : 1) * (stereo ? 2 : 1);
const uint8 *ptr = _origPtr + convertTimeToStreamPos(where, getRate(), isStereo()).totalNumberOfFrames() * (is16Bit ? 2 : 1);
if (ptr > _end) {
_ptr = _end;
return false;
@ -275,7 +268,7 @@ int RawDiskStream<stereo, is16Bit, isUnsigned, isLE>::readBuffer(int16 *buffer,
template<bool stereo, bool is16Bit, bool isUnsigned, bool isLE>
bool RawDiskStream<stereo, is16Bit, isUnsigned, isLE>::seek(const Timestamp &where) {
const uint32 seekSample = calculateSampleOffset(where, getRate()) * (stereo ? 2 : 1);
const uint32 seekSample = convertTimeToStreamPos(where, getRate(), isStereo()).totalNumberOfFrames();
uint32 curSample = 0;
// Search for the disk block in which the specific sample is placed

2
sound/decoders/vorbis.cpp
View File

@ -169,7 +169,7 @@ int VorbisInputStream::readBuffer(int16 *buffer, const int numSamples) {
}
bool VorbisInputStream::seek(const Timestamp &where) {
int res = ov_pcm_seek(&_ovFile, calculateSampleOffset(where, getRate()));
int res = ov_pcm_seek(&_ovFile, convertTimeToStreamPos(where, getRate(), isStereo()).totalNumberOfFrames());
if (res) {
warning("Error seeking in Vorbis stream (%d)", res);
_pos = _bufferEnd;