/** * OpenAL cross platform audio library * Copyright (C) 1999-2007 by authors. * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Library General Public * License as published by the Free Software Foundation; either * version 2 of the License, or (at your option) any later version. * * This library 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 * Library General Public License for more details. * * You should have received a copy of the GNU Library General Public * License along with this library; if not, write to the * Free Software Foundation, Inc., 59 Temple Place - Suite 330, * Boston, MA 02111-1307, USA. * Or go to http://www.gnu.org/copyleft/lgpl.html */ #include "config.h" #include #include #include #include #include #include "alMain.h" #include "AL/al.h" #include "AL/alc.h" #include "alSource.h" #include "alBuffer.h" #include "alListener.h" #include "alAuxEffectSlot.h" #include "alu.h" #include "bs2b.h" static __inline ALdouble point(ALdouble val1, ALdouble val2, ALint frac) { return val1; (void)val2; (void)frac; } static __inline ALdouble lerp(ALdouble val1, ALdouble val2, ALint frac) { val1 += ((val2-val1) * (frac * (1.0/(1<Params.Step; \ \ DryBuffer = Device->DryBuffer; \ ClickRemoval = Device->ClickRemoval; \ PendingClicks = Device->PendingClicks; \ DryFilter = &Source->Params.iirFilter; \ for(i = 0;i < OUTPUTCHANNELS;i++) \ DrySend[i] = Source->Params.DryGains[i]; \ \ pos = 0; \ frac = *DataPosFrac; \ \ if(j == 0) \ { \ value = sampler(data[pos], data[pos+1], frac); \ \ value = lpFilter4PC(DryFilter, 0, value); \ ClickRemoval[FRONT_LEFT] -= value*DrySend[FRONT_LEFT]; \ ClickRemoval[FRONT_RIGHT] -= value*DrySend[FRONT_RIGHT]; \ ClickRemoval[SIDE_LEFT] -= value*DrySend[SIDE_LEFT]; \ ClickRemoval[SIDE_RIGHT] -= value*DrySend[SIDE_RIGHT]; \ ClickRemoval[BACK_LEFT] -= value*DrySend[BACK_LEFT]; \ ClickRemoval[BACK_RIGHT] -= value*DrySend[BACK_RIGHT]; \ ClickRemoval[FRONT_CENTER] -= value*DrySend[FRONT_CENTER]; \ ClickRemoval[BACK_CENTER] -= value*DrySend[BACK_CENTER]; \ } \ for(BufferIdx = 0;BufferIdx < BufferSize;BufferIdx++) \ { \ /* First order interpolator */ \ value = sampler(data[pos], data[pos+1], frac); \ \ /* Direct path final mix buffer and panning */ \ value = lpFilter4P(DryFilter, 0, value); \ DryBuffer[j][FRONT_LEFT] += value*DrySend[FRONT_LEFT]; \ DryBuffer[j][FRONT_RIGHT] += value*DrySend[FRONT_RIGHT]; \ DryBuffer[j][SIDE_LEFT] += value*DrySend[SIDE_LEFT]; \ DryBuffer[j][SIDE_RIGHT] += value*DrySend[SIDE_RIGHT]; \ DryBuffer[j][BACK_LEFT] += value*DrySend[BACK_LEFT]; \ DryBuffer[j][BACK_RIGHT] += value*DrySend[BACK_RIGHT]; \ DryBuffer[j][FRONT_CENTER] += value*DrySend[FRONT_CENTER]; \ DryBuffer[j][BACK_CENTER] += value*DrySend[BACK_CENTER]; \ \ frac += increment; \ pos += frac>>FRACTIONBITS; \ frac &= FRACTIONMASK; \ j++; \ } \ if(j == SamplesToDo) \ { \ value = sampler(data[pos], data[pos+1], frac); \ \ value = lpFilter4PC(DryFilter, 0, value); \ PendingClicks[FRONT_LEFT] += value*DrySend[FRONT_LEFT]; \ PendingClicks[FRONT_RIGHT] += value*DrySend[FRONT_RIGHT]; \ PendingClicks[SIDE_LEFT] += value*DrySend[SIDE_LEFT]; \ PendingClicks[SIDE_RIGHT] += value*DrySend[SIDE_RIGHT]; \ PendingClicks[BACK_LEFT] += value*DrySend[BACK_LEFT]; \ PendingClicks[BACK_RIGHT] += value*DrySend[BACK_RIGHT]; \ PendingClicks[FRONT_CENTER] += value*DrySend[FRONT_CENTER]; \ PendingClicks[BACK_CENTER] += value*DrySend[BACK_CENTER]; \ } \ \ for(out = 0;out < Device->NumAuxSends;out++) \ { \ ALfloat WetSend; \ ALfloat *WetBuffer; \ ALfloat *WetClickRemoval; \ ALfloat *WetPendingClicks; \ FILTER *WetFilter; \ \ if(!Source->Send[out].Slot || \ Source->Send[out].Slot->effect.type == AL_EFFECT_NULL) \ continue; \ \ WetBuffer = Source->Send[out].Slot->WetBuffer; \ WetClickRemoval = Source->Send[out].Slot->ClickRemoval; \ WetPendingClicks = Source->Send[out].Slot->PendingClicks; \ WetFilter = &Source->Params.Send[out].iirFilter; \ WetSend = Source->Params.Send[out].WetGain; \ \ pos = 0; \ frac = *DataPosFrac; \ j -= BufferSize; \ \ if(j == 0) \ { \ value = sampler(data[pos], data[pos+1], frac); \ \ value = lpFilter2PC(WetFilter, 0, value); \ WetClickRemoval[0] -= value*WetSend; \ } \ for(BufferIdx = 0;BufferIdx < BufferSize;BufferIdx++) \ { \ /* First order interpolator */ \ value = sampler(data[pos], data[pos+1], frac); \ \ /* Room path final mix buffer and panning */ \ value = lpFilter2P(WetFilter, 0, value); \ WetBuffer[j] += value*WetSend; \ \ frac += increment; \ pos += frac>>FRACTIONBITS; \ frac &= FRACTIONMASK; \ j++; \ } \ if(j == SamplesToDo) \ { \ value = sampler(data[pos], data[pos+1], frac); \ \ value = lpFilter2PC(WetFilter, 0, value); \ WetPendingClicks[0] += value*WetSend; \ } \ } \ *DataPosInt += pos; \ *DataPosFrac = frac; \ } DECL_TEMPLATE(ALfloat, point) DECL_TEMPLATE(ALfloat, lerp) DECL_TEMPLATE(ALshort, point16) DECL_TEMPLATE(ALshort, lerp16) DECL_TEMPLATE(ALubyte, point8) DECL_TEMPLATE(ALubyte, lerp8) #undef DECL_TEMPLATE #define DECL_TEMPLATE(T, sampler) \ static void Mix_##T##_Stereo_##sampler(ALsource *Source, ALCdevice *Device, \ const T *data, ALuint *DataPosInt, ALuint *DataPosFrac, \ ALuint j, ALuint SamplesToDo, ALuint BufferSize) \ { \ static const ALuint Channels = 2; \ static const Channel chans[] = { \ FRONT_LEFT, FRONT_RIGHT, \ SIDE_LEFT, SIDE_RIGHT, \ BACK_LEFT, BACK_RIGHT \ }; \ const ALfloat scaler = 1.0f/Channels; \ ALfloat (*DryBuffer)[OUTPUTCHANNELS]; \ ALfloat *ClickRemoval, *PendingClicks; \ ALuint pos, frac; \ ALfloat DrySend[OUTPUTCHANNELS]; \ FILTER *DryFilter; \ ALuint BufferIdx; \ ALuint increment; \ ALuint i, out; \ ALfloat value; \ \ increment = Source->Params.Step; \ \ DryBuffer = Device->DryBuffer; \ ClickRemoval = Device->ClickRemoval; \ PendingClicks = Device->PendingClicks; \ DryFilter = &Source->Params.iirFilter; \ for(i = 0;i < OUTPUTCHANNELS;i++) \ DrySend[i] = Source->Params.DryGains[i]; \ \ pos = 0; \ frac = *DataPosFrac; \ \ if(j == 0) \ { \ for(i = 0;i < Channels;i++) \ { \ value = sampler(data[pos*Channels + i], \ data[(pos+1)*Channels + i], frac); \ \ value = lpFilter2PC(DryFilter, chans[i]*2, value); \ ClickRemoval[chans[i+0]] -= value*DrySend[chans[i+0]]; \ ClickRemoval[chans[i+2]] -= value*DrySend[chans[i+2]]; \ ClickRemoval[chans[i+4]] -= value*DrySend[chans[i+4]]; \ } \ } \ for(BufferIdx = 0;BufferIdx < BufferSize;BufferIdx++) \ { \ for(i = 0;i < Channels;i++) \ { \ value = sampler(data[pos*Channels + i], \ data[(pos+1)*Channels + i], frac); \ \ value = lpFilter2P(DryFilter, chans[i]*2, value); \ DryBuffer[j][chans[i+0]] += value*DrySend[chans[i+0]]; \ DryBuffer[j][chans[i+2]] += value*DrySend[chans[i+2]]; \ DryBuffer[j][chans[i+4]] += value*DrySend[chans[i+4]]; \ } \ \ frac += increment; \ pos += frac>>FRACTIONBITS; \ frac &= FRACTIONMASK; \ j++; \ } \ if(j == SamplesToDo) \ { \ for(i = 0;i < Channels;i++) \ { \ value = sampler(data[pos*Channels + i], \ data[(pos+1)*Channels + i], frac); \ \ value = lpFilter2PC(DryFilter, chans[i]*2, value); \ PendingClicks[chans[i+0]] += value*DrySend[chans[i+0]]; \ PendingClicks[chans[i+2]] += value*DrySend[chans[i+2]]; \ PendingClicks[chans[i+4]] += value*DrySend[chans[i+4]]; \ } \ } \ \ for(out = 0;out < Device->NumAuxSends;out++) \ { \ ALfloat WetSend; \ ALfloat *WetBuffer; \ ALfloat *WetClickRemoval; \ ALfloat *WetPendingClicks; \ FILTER *WetFilter; \ \ if(!Source->Send[out].Slot || \ Source->Send[out].Slot->effect.type == AL_EFFECT_NULL) \ continue; \ \ WetBuffer = Source->Send[out].Slot->WetBuffer; \ WetClickRemoval = Source->Send[out].Slot->ClickRemoval; \ WetPendingClicks = Source->Send[out].Slot->PendingClicks; \ WetFilter = &Source->Params.Send[out].iirFilter; \ WetSend = Source->Params.Send[out].WetGain; \ \ pos = 0; \ frac = *DataPosFrac; \ j -= BufferSize; \ \ if(j == 0) \ { \ for(i = 0;i < Channels;i++) \ { \ value = sampler(data[pos*Channels + i], \ data[(pos+1)*Channels + i], frac); \ \ value = lpFilter1PC(WetFilter, chans[i], value); \ WetClickRemoval[0] -= value*WetSend * scaler; \ } \ } \ for(BufferIdx = 0;BufferIdx < BufferSize;BufferIdx++) \ { \ for(i = 0;i < Channels;i++) \ { \ value = sampler(data[pos*Channels + i], \ data[(pos+1)*Channels + i], frac); \ \ value = lpFilter1P(WetFilter, chans[i], value); \ WetBuffer[j] += value*WetSend * scaler; \ } \ \ frac += increment; \ pos += frac>>FRACTIONBITS; \ frac &= FRACTIONMASK; \ j++; \ } \ if(j == SamplesToDo) \ { \ for(i = 0;i < Channels;i++) \ { \ value = sampler(data[pos*Channels + i], \ data[(pos+1)*Channels + i], frac); \ \ value = lpFilter1PC(WetFilter, chans[i], value); \ WetPendingClicks[0] += value*WetSend * scaler; \ } \ } \ } \ *DataPosInt += pos; \ *DataPosFrac = frac; \ } DECL_TEMPLATE(ALfloat, point) DECL_TEMPLATE(ALfloat, lerp) DECL_TEMPLATE(ALshort, point16) DECL_TEMPLATE(ALshort, lerp16) DECL_TEMPLATE(ALubyte, point8) DECL_TEMPLATE(ALubyte, lerp8) #undef DECL_TEMPLATE #define DECL_TEMPLATE(T, chans, sampler) \ static void Mix_##T##_##chans##_##sampler(ALsource *Source, ALCdevice *Device,\ const T *data, ALuint *DataPosInt, ALuint *DataPosFrac, \ ALuint j, ALuint SamplesToDo, ALuint BufferSize) \ { \ static const ALuint Channels = sizeof(chans)/sizeof(chans[0]); \ const ALfloat scaler = 1.0f/Channels; \ ALfloat (*DryBuffer)[OUTPUTCHANNELS]; \ ALfloat *ClickRemoval, *PendingClicks; \ ALuint pos, frac; \ ALfloat DrySend[OUTPUTCHANNELS]; \ FILTER *DryFilter; \ ALuint BufferIdx; \ ALuint increment; \ ALuint i, out; \ ALfloat value; \ \ increment = Source->Params.Step; \ \ DryBuffer = Device->DryBuffer; \ ClickRemoval = Device->ClickRemoval; \ PendingClicks = Device->PendingClicks; \ DryFilter = &Source->Params.iirFilter; \ for(i = 0;i < OUTPUTCHANNELS;i++) \ DrySend[i] = Source->Params.DryGains[i]; \ \ pos = 0; \ frac = *DataPosFrac; \ \ if(j == 0) \ { \ for(i = 0;i < Channels;i++) \ { \ value = sampler(data[pos*Channels + i], \ data[(pos+1)*Channels + i], frac); \ \ value = lpFilter2PC(DryFilter, chans[i]*2, value); \ ClickRemoval[chans[i]] -= value*DrySend[chans[i]]; \ } \ } \ for(BufferIdx = 0;BufferIdx < BufferSize;BufferIdx++) \ { \ for(i = 0;i < Channels;i++) \ { \ value = sampler(data[pos*Channels + i], \ data[(pos+1)*Channels + i], frac); \ \ value = lpFilter2P(DryFilter, chans[i]*2, value); \ DryBuffer[j][chans[i]] += value*DrySend[chans[i]]; \ } \ \ frac += increment; \ pos += frac>>FRACTIONBITS; \ frac &= FRACTIONMASK; \ j++; \ } \ if(j == SamplesToDo) \ { \ for(i = 0;i < Channels;i++) \ { \ value = sampler(data[pos*Channels + i], \ data[(pos+1)*Channels + i], frac); \ \ value = lpFilter2PC(DryFilter, chans[i]*2, value); \ PendingClicks[chans[i]] += value*DrySend[chans[i]]; \ } \ } \ \ for(out = 0;out < Device->NumAuxSends;out++) \ { \ ALfloat WetSend; \ ALfloat *WetBuffer; \ ALfloat *WetClickRemoval; \ ALfloat *WetPendingClicks; \ FILTER *WetFilter; \ \ if(!Source->Send[out].Slot || \ Source->Send[out].Slot->effect.type == AL_EFFECT_NULL) \ continue; \ \ WetBuffer = Source->Send[out].Slot->WetBuffer; \ WetClickRemoval = Source->Send[out].Slot->ClickRemoval; \ WetPendingClicks = Source->Send[out].Slot->PendingClicks; \ WetFilter = &Source->Params.Send[out].iirFilter; \ WetSend = Source->Params.Send[out].WetGain; \ \ pos = 0; \ frac = *DataPosFrac; \ j -= BufferSize; \ \ if(j == 0) \ { \ for(i = 0;i < Channels;i++) \ { \ value = sampler(data[pos*Channels + i], \ data[(pos+1)*Channels + i], frac); \ \ value = lpFilter1PC(WetFilter, chans[i], value); \ WetClickRemoval[0] -= value*WetSend * scaler; \ } \ } \ for(BufferIdx = 0;BufferIdx < BufferSize;BufferIdx++) \ { \ for(i = 0;i < Channels;i++) \ { \ value = sampler(data[pos*Channels + i], \ data[(pos+1)*Channels + i], frac); \ \ value = lpFilter1P(WetFilter, chans[i], value); \ WetBuffer[j] += value*WetSend * scaler; \ } \ \ frac += increment; \ pos += frac>>FRACTIONBITS; \ frac &= FRACTIONMASK; \ j++; \ } \ if(j == SamplesToDo) \ { \ for(i = 0;i < Channels;i++) \ { \ value = sampler(data[pos*Channels + i], \ data[(pos+1)*Channels + i], frac); \ \ value = lpFilter1PC(WetFilter, chans[i], value); \ WetPendingClicks[0] += value*WetSend * scaler; \ } \ } \ } \ *DataPosInt += pos; \ *DataPosFrac = frac; \ } static const Channel QuadChans[] = { FRONT_LEFT, FRONT_RIGHT, BACK_LEFT, BACK_RIGHT }; DECL_TEMPLATE(ALfloat, QuadChans, point) DECL_TEMPLATE(ALfloat, QuadChans, lerp) DECL_TEMPLATE(ALshort, QuadChans, point16) DECL_TEMPLATE(ALshort, QuadChans, lerp16) DECL_TEMPLATE(ALubyte, QuadChans, point8) DECL_TEMPLATE(ALubyte, QuadChans, lerp8) static const Channel X51Chans[] = { FRONT_LEFT, FRONT_RIGHT, FRONT_CENTER, LFE, BACK_LEFT, BACK_RIGHT }; DECL_TEMPLATE(ALfloat, X51Chans, point) DECL_TEMPLATE(ALfloat, X51Chans, lerp) DECL_TEMPLATE(ALshort, X51Chans, point16) DECL_TEMPLATE(ALshort, X51Chans, lerp16) DECL_TEMPLATE(ALubyte, X51Chans, point8) DECL_TEMPLATE(ALubyte, X51Chans, lerp8) static const Channel X61Chans[] = { FRONT_LEFT, FRONT_RIGHT, FRONT_CENTER, LFE, BACK_CENTER, SIDE_LEFT, SIDE_RIGHT }; DECL_TEMPLATE(ALfloat, X61Chans, point) DECL_TEMPLATE(ALfloat, X61Chans, lerp) DECL_TEMPLATE(ALshort, X61Chans, point16) DECL_TEMPLATE(ALshort, X61Chans, lerp16) DECL_TEMPLATE(ALubyte, X61Chans, point8) DECL_TEMPLATE(ALubyte, X61Chans, lerp8) static const Channel X71Chans[] = { FRONT_LEFT, FRONT_RIGHT, FRONT_CENTER, LFE, BACK_LEFT, BACK_RIGHT, SIDE_LEFT, SIDE_RIGHT }; DECL_TEMPLATE(ALfloat, X71Chans, point) DECL_TEMPLATE(ALfloat, X71Chans, lerp) DECL_TEMPLATE(ALshort, X71Chans, point16) DECL_TEMPLATE(ALshort, X71Chans, lerp16) DECL_TEMPLATE(ALubyte, X71Chans, point8) DECL_TEMPLATE(ALubyte, X71Chans, lerp8) #undef DECL_TEMPLATE #define DECL_TEMPLATE(T, sampler) \ static void Mix_##T##_##sampler(ALsource *Source, ALCdevice *Device, ALuint Channels, \ const ALvoid *Data, ALuint *DataPosInt, ALuint *DataPosFrac, \ ALuint j, ALuint SamplesToDo, ALuint BufferSize) \ { \ switch(Channels) \ { \ case 1: /* Mono */ \ Mix_##T##_Mono_##sampler(Source, Device, \ Data, DataPosInt, DataPosFrac, \ j, SamplesToDo, BufferSize); \ break; \ case 2: /* Stereo */ \ Mix_##T##_Stereo_##sampler(Source, Device, \ Data, DataPosInt, DataPosFrac, \ j, SamplesToDo, BufferSize); \ break; \ case 4: /* Quad */ \ Mix_##T##_QuadChans_##sampler(Source, Device, \ Data, DataPosInt, DataPosFrac, \ j, SamplesToDo, BufferSize); \ break; \ case 6: /* 5.1 */ \ Mix_##T##_X51Chans_##sampler(Source, Device, \ Data, DataPosInt, DataPosFrac, \ j, SamplesToDo, BufferSize); \ break; \ case 7: /* 6.1 */ \ Mix_##T##_X61Chans_##sampler(Source, Device, \ Data, DataPosInt, DataPosFrac, \ j, SamplesToDo, BufferSize); \ break; \ case 8: /* 7.1 */ \ Mix_##T##_X71Chans_##sampler(Source, Device, \ Data, DataPosInt, DataPosFrac, \ j, SamplesToDo, BufferSize); \ break; \ } \ } DECL_TEMPLATE(ALfloat, point) DECL_TEMPLATE(ALfloat, lerp) DECL_TEMPLATE(ALshort, point16) DECL_TEMPLATE(ALshort, lerp16) DECL_TEMPLATE(ALubyte, point8) DECL_TEMPLATE(ALubyte, lerp8) #undef DECL_TEMPLATE /* Stack data size can be whatever. Larger values need more stack, while * smaller values may need more iterations */ #ifndef STACK_DATA_SIZE #define STACK_DATA_SIZE 16384 #endif ALvoid MixSource(ALsource *Source, ALCdevice *Device, ALuint SamplesToDo) { ALbufferlistitem *BufferListItem; ALuint FrameSize, Channels, Bytes; ALuint DataPosInt, DataPosFrac; ALuint BuffersPlayed; ALboolean Looping; ALuint increment; ALenum State; ALuint i, j; ALint64 DataSize64; /* Get source info */ State = Source->state; BuffersPlayed = Source->BuffersPlayed; DataPosInt = Source->position; DataPosFrac = Source->position_fraction; Looping = Source->bLooping; increment = Source->Params.Step; /* Get buffer info */ FrameSize = Channels = Bytes = 0; BufferListItem = Source->queue; for(i = 0;i < Source->BuffersInQueue;i++) { const ALbuffer *ALBuffer; if((ALBuffer=BufferListItem->buffer) != NULL) { FrameSize = aluFrameSizeFromFormat(ALBuffer->format); Channels = aluChannelsFromFormat(ALBuffer->format); Bytes = aluBytesFromFormat(ALBuffer->format); break; } BufferListItem = BufferListItem->next; } /* Get current buffer queue item */ BufferListItem = Source->queue; for(i = 0;i < BuffersPlayed;i++) BufferListItem = BufferListItem->next; j = 0; do { ALubyte SrcData[STACK_DATA_SIZE]; ALuint SrcDataSize = 0; ALuint BufferSize; /* Figure out how many buffer bytes will be needed */ DataSize64 = SamplesToDo-j+1; DataSize64 *= increment; DataSize64 += DataPosFrac+FRACTIONMASK; DataSize64 >>= FRACTIONBITS; DataSize64 += BUFFER_PADDING; DataSize64 *= FrameSize; BufferSize = sizeof(SrcData) - SrcDataSize; BufferSize = min(DataSize64, BufferSize); if(Source->lSourceType == AL_STATIC) { const ALbuffer *ALBuffer = Source->Buffer; const ALubyte *Data = ALBuffer->data; ALuint DataSize; /* If current pos is beyond the loop range, do not loop */ if(Looping == AL_FALSE || DataPosInt >= (ALuint)ALBuffer->LoopEnd) { Looping = AL_FALSE; /* Copy what's left to play in the source buffer, and clear the * rest of the temp buffer */ DataSize = ALBuffer->size - DataPosInt*FrameSize; DataSize = min(BufferSize, DataSize); memcpy(&SrcData[SrcDataSize], &Data[DataPosInt*FrameSize], DataSize); SrcDataSize += DataSize; BufferSize -= DataSize; memset(&SrcData[SrcDataSize], (Bytes==1)?0x80:0, BufferSize); SrcDataSize += BufferSize; BufferSize -= BufferSize; } else { ALuint LoopStart = ALBuffer->LoopStart; ALuint LoopEnd = ALBuffer->LoopEnd; /* Copy what's left of this loop iteration, then copy repeats * of the loop section */ DataSize = (LoopEnd-DataPosInt) * FrameSize; DataSize = min(BufferSize, DataSize); memcpy(&SrcData[SrcDataSize], &Data[DataPosInt*FrameSize], DataSize); SrcDataSize += DataSize; BufferSize -= DataSize; DataSize = (LoopEnd-LoopStart) * FrameSize; while(BufferSize > 0) { DataSize = min(BufferSize, DataSize); memcpy(&SrcData[SrcDataSize], &Data[LoopStart*FrameSize], DataSize); SrcDataSize += DataSize; BufferSize -= DataSize; } } } else { /* Crawl the buffer queue to fill in the temp buffer */ ALbufferlistitem *BufferListIter = BufferListItem; ALuint pos = DataPosInt*FrameSize; while(BufferListIter && BufferSize > 0) { const ALbuffer *ALBuffer; if((ALBuffer=BufferListIter->buffer) != NULL) { const ALubyte *Data = ALBuffer->data; ALuint DataSize = ALBuffer->size; /* Skip the data already played */ if(DataSize <= pos) pos -= DataSize; else { Data += pos; DataSize -= pos; pos -= pos; DataSize = min(BufferSize, DataSize); memcpy(&SrcData[SrcDataSize], Data, DataSize); SrcDataSize += DataSize; BufferSize -= DataSize; } } BufferListIter = BufferListIter->next; if(!BufferListIter && Looping) BufferListIter = Source->queue; else if(!BufferListIter) { memset(&SrcData[SrcDataSize], (Bytes==1)?0x80:0, BufferSize); SrcDataSize += BufferSize; BufferSize -= BufferSize; } } } /* Figure out how many samples we can mix. */ DataSize64 = SrcDataSize / FrameSize; DataSize64 -= BUFFER_PADDING; DataSize64 <<= FRACTIONBITS; DataSize64 -= increment; BufferSize = (ALuint)((DataSize64-DataPosFrac+(increment-1)) / increment); BufferSize = min(BufferSize, (SamplesToDo-j)); if(BufferSize == 0) { AL_PRINT("No samples to mix! Pitch too high (%u, %g)?\n", increment, increment/(double)(1<queue; BuffersPlayed = Source->BuffersInQueue; DataPosInt = 0; DataPosFrac = 0; break; } switch(Source->Resampler) { case POINT_RESAMPLER: if(Bytes == 4) Mix_ALfloat_point(Source, Device, Channels, SrcData, &DataPosInt, &DataPosFrac, j, SamplesToDo, BufferSize); else if(Bytes == 2) Mix_ALshort_point16(Source, Device, Channels, SrcData, &DataPosInt, &DataPosFrac, j, SamplesToDo, BufferSize); else if(Bytes == 1) Mix_ALubyte_point8(Source, Device, Channels, SrcData, &DataPosInt, &DataPosFrac, j, SamplesToDo, BufferSize); break; case LINEAR_RESAMPLER: if(Bytes == 4) Mix_ALfloat_lerp(Source, Device, Channels, SrcData, &DataPosInt, &DataPosFrac, j, SamplesToDo, BufferSize); else if(Bytes == 2) Mix_ALshort_lerp16(Source, Device, Channels, SrcData, &DataPosInt, &DataPosFrac, j, SamplesToDo, BufferSize); else if(Bytes == 1) Mix_ALubyte_lerp8(Source, Device, Channels, SrcData, &DataPosInt, &DataPosFrac, j, SamplesToDo, BufferSize); break; case RESAMPLER_MIN: case RESAMPLER_MAX: break; } j += BufferSize; /* Handle looping sources */ while(1) { const ALbuffer *ALBuffer; ALuint DataSize = 0; ALuint LoopStart = 0; ALuint LoopEnd = 0; if((ALBuffer=BufferListItem->buffer) != NULL) { DataSize = ALBuffer->size / FrameSize; if(DataSize > DataPosInt) break; LoopStart = ALBuffer->LoopStart; LoopEnd = ALBuffer->LoopEnd; } if(BufferListItem->next) { BufferListItem = BufferListItem->next; BuffersPlayed++; } else if(Looping) { BufferListItem = Source->queue; BuffersPlayed = 0; if(Source->lSourceType == AL_STATIC) { DataPosInt = ((DataPosInt-LoopStart)%(LoopEnd-LoopStart)) + LoopStart; break; } } else { State = AL_STOPPED; BufferListItem = Source->queue; BuffersPlayed = Source->BuffersInQueue; DataPosInt = 0; DataPosFrac = 0; break; } DataPosInt -= DataSize; } } while(State == AL_PLAYING && j < SamplesToDo); /* Update source info */ Source->state = State; Source->BuffersPlayed = BuffersPlayed; Source->position = DataPosInt; Source->position_fraction = DataPosFrac; Source->Buffer = BufferListItem->buffer; }