diff options
Diffstat (limited to 'Alc')
| -rw-r--r-- | Alc/mixer.c | 98 |
1 files changed, 88 insertions, 10 deletions
diff --git a/Alc/mixer.c b/Alc/mixer.c index 772ff599..3c76cd40 100644 --- a/Alc/mixer.c +++ b/Alc/mixer.c @@ -649,7 +649,8 @@ ALvoid MixSource(ALsource *Source, ALCdevice *Device, ALuint SamplesToDo) j = 0; do { - ALubyte SrcData[STACK_DATA_SIZE]; + ALubyte StackData[STACK_DATA_SIZE]; + ALubyte *SrcData = StackData; ALuint SrcDataSize = 0; ALuint BufferSize; @@ -658,11 +659,10 @@ ALvoid MixSource(ALsource *Source, ALCdevice *Device, ALuint SamplesToDo) DataSize64 *= increment; DataSize64 += DataPosFrac+FRACTIONMASK; DataSize64 >>= FRACTIONBITS; - DataSize64 += BUFFER_PADDING; + DataSize64 += BUFFER_PADDING+BUFFER_PREPADDING; DataSize64 *= FrameSize; - BufferSize = sizeof(SrcData) - SrcDataSize; - BufferSize = min(DataSize64, BufferSize); + BufferSize = min(DataSize64, STACK_DATA_SIZE); BufferSize -= BufferSize%FrameSize; if(Source->lSourceType == AL_STATIC) @@ -670,18 +670,33 @@ ALvoid MixSource(ALsource *Source, ALCdevice *Device, ALuint SamplesToDo) const ALbuffer *ALBuffer = Source->Buffer; const ALubyte *Data = ALBuffer->data; ALuint DataSize; + ALuint pos; /* If current pos is beyond the loop range, do not loop */ if(Looping == AL_FALSE || DataPosInt >= (ALuint)ALBuffer->LoopEnd) { Looping = AL_FALSE; + if(DataPosInt >= BUFFER_PREPADDING) + pos = (DataPosInt-BUFFER_PREPADDING)*FrameSize; + else + { + DataSize = (BUFFER_PREPADDING-DataPosInt)*FrameSize; + DataSize = min(BufferSize, DataSize); + + memset(&SrcData[SrcDataSize], (Bytes==1)?0x80:0, DataSize); + SrcDataSize += DataSize; + BufferSize -= DataSize; + + pos = 0; + } + /* Copy what's left to play in the source buffer, and clear the * rest of the temp buffer */ - DataSize = ALBuffer->size - DataPosInt*FrameSize; + DataSize = ALBuffer->size - pos; DataSize = min(BufferSize, DataSize); - memcpy(&SrcData[SrcDataSize], &Data[DataPosInt*FrameSize], DataSize); + memcpy(&SrcData[SrcDataSize], &Data[pos], DataSize); SrcDataSize += DataSize; BufferSize -= DataSize; @@ -694,12 +709,35 @@ ALvoid MixSource(ALsource *Source, ALCdevice *Device, ALuint SamplesToDo) ALuint LoopStart = ALBuffer->LoopStart; ALuint LoopEnd = ALBuffer->LoopEnd; + if(DataPosInt >= LoopStart) + { + pos = DataPosInt-LoopStart; + while(pos < BUFFER_PREPADDING) + pos += LoopEnd-LoopStart; + pos -= BUFFER_PREPADDING; + pos += LoopStart; + pos *= FrameSize; + } + else if(DataPosInt >= BUFFER_PREPADDING) + pos = (DataPosInt-BUFFER_PREPADDING)*FrameSize; + else + { + DataSize = (BUFFER_PREPADDING-DataPosInt)*FrameSize; + DataSize = min(BufferSize, DataSize); + + memset(&SrcData[SrcDataSize], (Bytes==1)?0x80:0, DataSize); + SrcDataSize += DataSize; + BufferSize -= DataSize; + + pos = 0; + } + /* Copy what's left of this loop iteration, then copy repeats * of the loop section */ - DataSize = (LoopEnd-DataPosInt) * FrameSize; + DataSize = LoopEnd*FrameSize - pos; DataSize = min(BufferSize, DataSize); - memcpy(&SrcData[SrcDataSize], &Data[DataPosInt*FrameSize], DataSize); + memcpy(&SrcData[SrcDataSize], &Data[pos], DataSize); SrcDataSize += DataSize; BufferSize -= DataSize; @@ -718,7 +756,46 @@ ALvoid MixSource(ALsource *Source, ALCdevice *Device, ALuint SamplesToDo) { /* Crawl the buffer queue to fill in the temp buffer */ ALbufferlistitem *BufferListIter = BufferListItem; - ALuint pos = DataPosInt*FrameSize; + ALuint pos; + + if(DataPosInt >= BUFFER_PREPADDING) + pos = (DataPosInt-BUFFER_PREPADDING)*FrameSize; + else + { + pos = (BUFFER_PREPADDING-DataPosInt)*FrameSize; + while(pos > 0) + { + if(!BufferListIter->prev && !Looping) + { + ALuint DataSize = min(BufferSize, pos); + + memset(&SrcData[SrcDataSize], (Bytes==1)?0x80:0, DataSize); + SrcDataSize += DataSize; + BufferSize -= DataSize; + + pos = 0; + break; + } + + if(Looping) + { + while(BufferListIter->next) + BufferListIter = BufferListIter->next; + } + else + BufferListIter = BufferListIter->prev; + + if(BufferListIter->buffer) + { + if((ALuint)BufferListIter->buffer->size > pos) + { + pos = BufferListIter->buffer->size - pos; + break; + } + pos -= BufferListIter->buffer->size; + } + } + } while(BufferListIter && BufferSize > 0) { @@ -757,7 +834,7 @@ ALvoid MixSource(ALsource *Source, ALCdevice *Device, ALuint SamplesToDo) /* Figure out how many samples we can mix. */ DataSize64 = SrcDataSize / FrameSize; - DataSize64 -= BUFFER_PADDING; + DataSize64 -= BUFFER_PADDING+BUFFER_PREPADDING; DataSize64 <<= FRACTIONBITS; DataSize64 -= increment; @@ -775,6 +852,7 @@ ALvoid MixSource(ALsource *Source, ALCdevice *Device, ALuint SamplesToDo) break; } + SrcData += BUFFER_PREPADDING*FrameSize; switch(Source->Resampler) { case POINT_RESAMPLER: |