/** * 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 ALfloat point32(const ALfloat *vals, ALint step, ALint frac) { return vals[0]; (void)step; (void)frac; } static __inline ALfloat lerp32(const ALfloat *vals, ALint step, ALint frac) { return lerp(vals[0], vals[step], frac * (1.0f/FRACTIONONE)); } static __inline ALfloat cubic32(const ALfloat *vals, ALint step, ALint frac) { return cubic(vals[-step], vals[0], vals[step], vals[step+step], frac * (1.0f/FRACTIONONE)); } #ifdef __GNUC__ #define LIKELY(x) __builtin_expect(!!(x), 1) #define UNLIKELY(x) __builtin_expect(!!(x), 0) #else #define LIKELY(x) (x) #define UNLIKELY(x) (x) #endif #if defined(__ARM_NEON__) && defined(HAVE_ARM_NEON_H) #include static __inline void ApplyCoeffs(ALuint Offset, ALfloat (*RESTRICT Values)[2], ALfloat (*RESTRICT Coeffs)[2], ALfloat left, ALfloat right) { ALuint c; float32x4_t leftright4; { float32x2_t leftright2 = vdup_n_f32(0.0); leftright2 = vset_lane_f32(left, leftright2, 0); leftright2 = vset_lane_f32(right, leftright2, 1); leftright4 = vcombine_f32(leftright2, leftright2); } for(c = 0;c < HRIR_LENGTH;c += 2) { const ALuint o0 = (Offset+c)&HRIR_MASK; const ALuint o1 = (o0+1)&HRIR_MASK; float32x4_t vals = vcombine_f32(vld1_f32((float32_t*)&Values[o0][0]), vld1_f32((float32_t*)&Values[o1][0])); float32x4_t coefs = vld1q_f32((float32_t*)&Coeffs[c][0]); vals = vmlaq_f32(vals, coefs, leftright4); vst1_f32((float32_t*)&Values[o0][0], vget_low_f32(vals)); vst1_f32((float32_t*)&Values[o1][0], vget_high_f32(vals)); } } #else static __inline void ApplyCoeffs(ALuint Offset, ALfloat (*RESTRICT Values)[2], ALfloat (*RESTRICT Coeffs)[2], ALfloat left, ALfloat right) { ALuint c; for(c = 0;c < HRIR_LENGTH;c++) { const ALuint off = (Offset+c)&HRIR_MASK; Values[off][0] += Coeffs[c][0] * left; Values[off][1] += Coeffs[c][1] * right; } } #endif #define DECL_TEMPLATE(T, sampler) \ static void Mix_Hrtf_##T##_##sampler(ALsource *Source, ALCdevice *Device, \ const ALvoid *srcdata, ALuint *DataPosInt, ALuint *DataPosFrac, \ ALuint OutPos, ALuint SamplesToDo, ALuint BufferSize) \ { \ const ALuint NumChannels = Source->NumChannels; \ const T *RESTRICT data = srcdata; \ const ALint *RESTRICT DelayStep = Source->Params.HrtfDelayStep; \ ALfloat (*RESTRICT DryBuffer)[MAXCHANNELS]; \ ALfloat *RESTRICT ClickRemoval, *RESTRICT PendingClicks; \ ALfloat (*RESTRICT CoeffStep)[2] = Source->Params.HrtfCoeffStep; \ ALuint pos, frac; \ FILTER *DryFilter; \ ALuint BufferIdx; \ ALuint increment; \ ALuint i, out, c; \ ALfloat value; \ \ increment = Source->Params.Step; \ \ DryBuffer = Device->DryBuffer; \ ClickRemoval = Device->ClickRemoval; \ PendingClicks = Device->PendingClicks; \ DryFilter = &Source->Params.iirFilter; \ \ pos = 0; \ frac = *DataPosFrac; \ \ for(i = 0;i < NumChannels;i++) \ { \ ALfloat (*RESTRICT TargetCoeffs)[2] = Source->Params.HrtfCoeffs[i]; \ ALuint *RESTRICT TargetDelay = Source->Params.HrtfDelay[i]; \ ALfloat *RESTRICT History = Source->HrtfHistory[i]; \ ALfloat (*RESTRICT Values)[2] = Source->HrtfValues[i]; \ ALint Counter = maxu(Source->HrtfCounter, OutPos) - OutPos; \ ALuint Offset = Source->HrtfOffset + OutPos; \ ALfloat Coeffs[HRIR_LENGTH][2]; \ ALuint Delay[2]; \ ALfloat left, right; \ \ pos = 0; \ frac = *DataPosFrac; \ \ for(c = 0;c < HRIR_LENGTH;c++) \ { \ Coeffs[c][0] = TargetCoeffs[c][0] - (CoeffStep[c][0]*Counter); \ Coeffs[c][1] = TargetCoeffs[c][1] - (CoeffStep[c][1]*Counter); \ } \ \ Delay[0] = TargetDelay[0] - (DelayStep[0]*Counter) + 32768; \ Delay[1] = TargetDelay[1] - (DelayStep[1]*Counter) + 32768; \ \ if(LIKELY(OutPos == 0)) \ { \ value = sampler(data + pos*NumChannels + i, NumChannels, frac); \ value = lpFilter2PC(DryFilter, i, value); \ \ History[Offset&SRC_HISTORY_MASK] = value; \ left = History[(Offset-(Delay[0]>>16))&SRC_HISTORY_MASK]; \ right = History[(Offset-(Delay[1]>>16))&SRC_HISTORY_MASK]; \ \ ClickRemoval[FRONT_LEFT] -= Values[(Offset+1)&HRIR_MASK][0] + \ Coeffs[0][0] * left; \ ClickRemoval[FRONT_RIGHT] -= Values[(Offset+1)&HRIR_MASK][1] + \ Coeffs[0][1] * right; \ } \ for(BufferIdx = 0;BufferIdx < BufferSize && Counter > 0;BufferIdx++) \ { \ value = sampler(data + pos*NumChannels + i, NumChannels, frac); \ value = lpFilter2P(DryFilter, i, value); \ \ History[Offset&SRC_HISTORY_MASK] = value; \ left = History[(Offset-(Delay[0]>>16))&SRC_HISTORY_MASK]; \ right = History[(Offset-(Delay[1]>>16))&SRC_HISTORY_MASK]; \ \ Delay[0] += DelayStep[0]; \ Delay[1] += DelayStep[1]; \ \ Values[Offset&HRIR_MASK][0] = 0.0f; \ Values[Offset&HRIR_MASK][1] = 0.0f; \ Offset++; \ \ for(c = 0;c < HRIR_LENGTH;c++) \ { \ const ALuint off = (Offset+c)&HRIR_MASK; \ Values[off][0] += Coeffs[c][0] * left; \ Values[off][1] += Coeffs[c][1] * right; \ Coeffs[c][0] += CoeffStep[c][0]; \ Coeffs[c][1] += CoeffStep[c][1]; \ } \ \ DryBuffer[OutPos][FRONT_LEFT] += Values[Offset&HRIR_MASK][0]; \ DryBuffer[OutPos][FRONT_RIGHT] += Values[Offset&HRIR_MASK][1]; \ \ frac += increment; \ pos += frac>>FRACTIONBITS; \ frac &= FRACTIONMASK; \ OutPos++; \ Counter--; \ } \ \ Delay[0] >>= 16; \ Delay[1] >>= 16; \ for(;BufferIdx < BufferSize;BufferIdx++) \ { \ value = sampler(data + pos*NumChannels + i, NumChannels, frac); \ value = lpFilter2P(DryFilter, i, value); \ \ History[Offset&SRC_HISTORY_MASK] = value; \ left = History[(Offset-Delay[0])&SRC_HISTORY_MASK]; \ right = History[(Offset-Delay[1])&SRC_HISTORY_MASK]; \ \ Values[Offset&HRIR_MASK][0] = 0.0f; \ Values[Offset&HRIR_MASK][1] = 0.0f; \ Offset++; \ \ ApplyCoeffs(Offset, Values, Coeffs, left, right); \ DryBuffer[OutPos][FRONT_LEFT] += Values[Offset&HRIR_MASK][0]; \ DryBuffer[OutPos][FRONT_RIGHT] += Values[Offset&HRIR_MASK][1]; \ \ frac += increment; \ pos += frac>>FRACTIONBITS; \ frac &= FRACTIONMASK; \ OutPos++; \ } \ if(LIKELY(OutPos == SamplesToDo)) \ { \ value = sampler(data + pos*NumChannels + i, NumChannels, frac); \ value = lpFilter2PC(DryFilter, i, value); \ \ History[Offset&SRC_HISTORY_MASK] = value; \ left = History[(Offset-Delay[0])&SRC_HISTORY_MASK]; \ right = History[(Offset-Delay[1])&SRC_HISTORY_MASK]; \ \ PendingClicks[FRONT_LEFT] += Values[(Offset+1)&HRIR_MASK][0] + \ Coeffs[0][0] * left; \ PendingClicks[FRONT_RIGHT] += Values[(Offset+1)&HRIR_MASK][1] + \ Coeffs[0][1] * right; \ } \ OutPos -= BufferSize; \ } \ \ for(out = 0;out < Device->NumAuxSends;out++) \ { \ ALeffectslot *Slot = Source->Params.Send[out].Slot; \ ALfloat WetSend; \ ALfloat *RESTRICT WetBuffer; \ ALfloat *RESTRICT WetClickRemoval; \ ALfloat *RESTRICT WetPendingClicks; \ FILTER *WetFilter; \ \ if(!Slot || Slot->effect.type == AL_EFFECT_NULL) \ continue; \ \ WetBuffer = Slot->WetBuffer; \ WetClickRemoval = Slot->ClickRemoval; \ WetPendingClicks = Slot->PendingClicks; \ WetFilter = &Source->Params.Send[out].iirFilter; \ WetSend = Source->Params.Send[out].WetGain; \ \ for(i = 0;i < NumChannels;i++) \ { \ pos = 0; \ frac = *DataPosFrac; \ \ if(LIKELY(OutPos == 0)) \ { \ value = sampler(data + pos*NumChannels + i, NumChannels,frac);\ value = lpFilter1PC(WetFilter, i, value); \ \ WetClickRemoval[0] -= value * WetSend; \ } \ for(BufferIdx = 0;BufferIdx < BufferSize;BufferIdx++) \ { \ value = sampler(data + pos*NumChannels + i, NumChannels,frac);\ value = lpFilter1P(WetFilter, i, value); \ \ WetBuffer[OutPos] += value * WetSend; \ \ frac += increment; \ pos += frac>>FRACTIONBITS; \ frac &= FRACTIONMASK; \ OutPos++; \ } \ if(LIKELY(OutPos == SamplesToDo)) \ { \ value = sampler(data + pos*NumChannels + i, NumChannels,frac);\ value = lpFilter1PC(WetFilter, i, value); \ \ WetPendingClicks[0] += value * WetSend; \ } \ OutPos -= BufferSize; \ } \ } \ *DataPosInt += pos; \ *DataPosFrac = frac; \ } DECL_TEMPLATE(ALfloat, point32) DECL_TEMPLATE(ALfloat, lerp32) DECL_TEMPLATE(ALfloat, cubic32) #undef DECL_TEMPLATE #define DECL_TEMPLATE(T, sampler) \ static void Mix_##T##_##sampler(ALsource *Source, ALCdevice *Device, \ const ALvoid *srcdata, ALuint *DataPosInt, ALuint *DataPosFrac, \ ALuint OutPos, ALuint SamplesToDo, ALuint BufferSize) \ { \ const ALuint NumChannels = Source->NumChannels; \ const T *RESTRICT data = srcdata; \ ALfloat (*DryBuffer)[MAXCHANNELS]; \ ALfloat *ClickRemoval, *PendingClicks; \ ALfloat DrySend[MAXCHANNELS]; \ FILTER *DryFilter; \ ALuint pos, frac; \ ALuint BufferIdx; \ ALuint increment; \ ALuint i, out, c; \ ALfloat value; \ \ increment = Source->Params.Step; \ \ DryBuffer = Device->DryBuffer; \ ClickRemoval = Device->ClickRemoval; \ PendingClicks = Device->PendingClicks; \ DryFilter = &Source->Params.iirFilter; \ \ pos = 0; \ frac = *DataPosFrac; \ \ for(i = 0;i < NumChannels;i++) \ { \ for(c = 0;c < MAXCHANNELS;c++) \ DrySend[c] = Source->Params.DryGains[i][c]; \ \ pos = 0; \ frac = *DataPosFrac; \ \ if(OutPos == 0) \ { \ value = sampler(data + pos*NumChannels + i, NumChannels, frac); \ \ value = lpFilter2PC(DryFilter, i, value); \ for(c = 0;c < MAXCHANNELS;c++) \ ClickRemoval[c] -= value*DrySend[c]; \ } \ for(BufferIdx = 0;BufferIdx < BufferSize;BufferIdx++) \ { \ value = sampler(data + pos*NumChannels + i, NumChannels, frac); \ \ value = lpFilter2P(DryFilter, i, value); \ for(c = 0;c < MAXCHANNELS;c++) \ DryBuffer[OutPos][c] += value*DrySend[c]; \ \ frac += increment; \ pos += frac>>FRACTIONBITS; \ frac &= FRACTIONMASK; \ OutPos++; \ } \ if(OutPos == SamplesToDo) \ { \ value = sampler(data + pos*NumChannels + i, NumChannels, frac); \ \ value = lpFilter2PC(DryFilter, i, value); \ for(c = 0;c < MAXCHANNELS;c++) \ PendingClicks[c] += value*DrySend[c]; \ } \ OutPos -= BufferSize; \ } \ \ for(out = 0;out < Device->NumAuxSends;out++) \ { \ ALeffectslot *Slot = Source->Params.Send[out].Slot; \ ALfloat WetSend; \ ALfloat *WetBuffer; \ ALfloat *WetClickRemoval; \ ALfloat *WetPendingClicks; \ FILTER *WetFilter; \ \ if(!Slot || Slot->effect.type == AL_EFFECT_NULL) \ continue; \ \ WetBuffer = Slot->WetBuffer; \ WetClickRemoval = Slot->ClickRemoval; \ WetPendingClicks = Slot->PendingClicks; \ WetFilter = &Source->Params.Send[out].iirFilter; \ WetSend = Source->Params.Send[out].WetGain; \ \ for(i = 0;i < NumChannels;i++) \ { \ pos = 0; \ frac = *DataPosFrac; \ \ if(OutPos == 0) \ { \ value = sampler(data + pos*NumChannels + i, NumChannels,frac);\ \ value = lpFilter1PC(WetFilter, i, value); \ WetClickRemoval[0] -= value * WetSend; \ } \ for(BufferIdx = 0;BufferIdx < BufferSize;BufferIdx++) \ { \ value = sampler(data + pos*NumChannels + i, NumChannels,frac);\ \ value = lpFilter1P(WetFilter, i, value); \ WetBuffer[OutPos] += value * WetSend; \ \ frac += increment; \ pos += frac>>FRACTIONBITS; \ frac &= FRACTIONMASK; \ OutPos++; \ } \ if(OutPos == SamplesToDo) \ { \ value = sampler(data + pos*NumChannels + i, NumChannels,frac);\ \ value = lpFilter1PC(WetFilter, i, value); \ WetPendingClicks[0] += value * WetSend; \ } \ OutPos -= BufferSize; \ } \ } \ *DataPosInt += pos; \ *DataPosFrac = frac; \ } DECL_TEMPLATE(ALfloat, point32) DECL_TEMPLATE(ALfloat, lerp32) DECL_TEMPLATE(ALfloat, cubic32) #undef DECL_TEMPLATE #define DECL_TEMPLATE(sampler) \ static MixerFunc Select_##sampler(enum FmtType FmtType) \ { \ switch(FmtType) \ { \ case FmtByte: \ case FmtShort: \ case FmtFloat: \ return Mix_ALfloat_##sampler##32; \ } \ return NULL; \ } DECL_TEMPLATE(point) DECL_TEMPLATE(lerp) DECL_TEMPLATE(cubic) #undef DECL_TEMPLATE MixerFunc SelectMixer(ALbuffer *Buffer, enum Resampler Resampler) { switch(Resampler) { case POINT_RESAMPLER: return Select_point(Buffer->FmtType); case LINEAR_RESAMPLER: return Select_lerp(Buffer->FmtType); case CUBIC_RESAMPLER: return Select_cubic(Buffer->FmtType); case RESAMPLER_MIN: case RESAMPLER_MAX: break; } return NULL; } #define DECL_TEMPLATE(sampler) \ static MixerFunc Select_Hrtf_##sampler(enum FmtType FmtType) \ { \ switch(FmtType) \ { \ case FmtByte: \ case FmtShort: \ case FmtFloat: \ return Mix_Hrtf_ALfloat_##sampler##32; \ } \ return NULL; \ } DECL_TEMPLATE(point) DECL_TEMPLATE(lerp) DECL_TEMPLATE(cubic) #undef DECL_TEMPLATE MixerFunc SelectHrtfMixer(ALbuffer *Buffer, enum Resampler Resampler) { switch(Resampler) { case POINT_RESAMPLER: return Select_Hrtf_point(Buffer->FmtType); case LINEAR_RESAMPLER: return Select_Hrtf_lerp(Buffer->FmtType); case CUBIC_RESAMPLER: return Select_Hrtf_cubic(Buffer->FmtType); case RESAMPLER_MIN: case RESAMPLER_MAX: break; } return NULL; } static __inline ALfloat Sample_ALbyte(ALbyte val) { return val * (1.0f/127.0f); } static __inline ALfloat Sample_ALshort(ALshort val) { return val * (1.0f/32767.0f); } static __inline ALfloat Sample_ALfloat(ALfloat val) { return val; } #define DECL_TEMPLATE(T) \ static void Load_##T(ALfloat *dst, const T *src, ALuint samples) \ { \ ALuint i; \ for(i = 0;i < samples;i++) \ dst[i] = Sample_##T(src[i]); \ } DECL_TEMPLATE(ALbyte) DECL_TEMPLATE(ALshort) DECL_TEMPLATE(ALfloat) #undef DECL_TEMPLATE static void LoadStack(ALfloat *dst, const ALvoid *src, enum FmtType srctype, ALuint samples) { switch(srctype) { case FmtByte: Load_ALbyte(dst, src, samples); break; case FmtShort: Load_ALshort(dst, src, samples); break; case FmtFloat: Load_ALfloat(dst, src, samples); break; } } static void SilenceStack(ALfloat *dst, ALuint samples) { ALuint i; for(i = 0;i < samples;i++) dst[i] = 0.0f; } ALvoid MixSource(ALsource *Source, ALCdevice *Device, ALuint SamplesToDo) { ALbufferlistitem *BufferListItem; ALuint DataPosInt, DataPosFrac; ALuint BuffersPlayed; ALboolean Looping; ALuint increment; enum Resampler Resampler; ALenum State; ALuint OutPos; ALuint NumChannels; ALuint FrameSize; ALint64 DataSize64; ALuint i; /* Get source info */ State = Source->state; BuffersPlayed = Source->BuffersPlayed; DataPosInt = Source->position; DataPosFrac = Source->position_fraction; Looping = Source->bLooping; increment = Source->Params.Step; Resampler = Source->Resampler; NumChannels = Source->NumChannels; FrameSize = NumChannels * Source->SampleSize; /* Get current buffer queue item */ BufferListItem = Source->queue; for(i = 0;i < BuffersPlayed;i++) BufferListItem = BufferListItem->next; OutPos = 0; do { const ALuint BufferPrePadding = ResamplerPrePadding[Resampler]; const ALuint BufferPadding = ResamplerPadding[Resampler]; ALfloat StackData[STACK_DATA_SIZE/sizeof(ALfloat)]; ALfloat *SrcData = StackData; ALuint SrcDataSize = 0; ALuint BufferSize; /* Figure out how many buffer bytes will be needed */ DataSize64 = SamplesToDo-OutPos+1; DataSize64 *= increment; DataSize64 += DataPosFrac+FRACTIONMASK; DataSize64 >>= FRACTIONBITS; DataSize64 += BufferPadding+BufferPrePadding; DataSize64 *= FrameSize; BufferSize = (ALuint)((DataSize64 > STACK_DATA_SIZE) ? STACK_DATA_SIZE : DataSize64); BufferSize /= FrameSize; if(Source->lSourceType == AL_STATIC) { const ALbuffer *ALBuffer = Source->queue->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 >= BufferPrePadding) pos = DataPosInt - BufferPrePadding; else { DataSize = BufferPrePadding - DataPosInt; DataSize = minu(BufferSize, DataSize); SilenceStack(&SrcData[SrcDataSize*NumChannels], DataSize*NumChannels); 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->SampleLen - pos; DataSize = minu(BufferSize, DataSize); LoadStack(&SrcData[SrcDataSize*NumChannels], &Data[pos*FrameSize], ALBuffer->FmtType, DataSize*NumChannels); SrcDataSize += DataSize; BufferSize -= DataSize; SilenceStack(&SrcData[SrcDataSize*NumChannels], BufferSize*NumChannels); SrcDataSize += BufferSize; BufferSize -= BufferSize; } else { ALuint LoopStart = ALBuffer->LoopStart; ALuint LoopEnd = ALBuffer->LoopEnd; if(DataPosInt >= LoopStart) { pos = DataPosInt-LoopStart; while(pos < BufferPrePadding) pos += LoopEnd-LoopStart; pos -= BufferPrePadding; pos += LoopStart; } else if(DataPosInt >= BufferPrePadding) pos = DataPosInt - BufferPrePadding; else { DataSize = BufferPrePadding - DataPosInt; DataSize = minu(BufferSize, DataSize); SilenceStack(&SrcData[SrcDataSize*NumChannels], DataSize*NumChannels); SrcDataSize += DataSize; BufferSize -= DataSize; pos = 0; } /* Copy what's left of this loop iteration, then copy repeats * of the loop section */ DataSize = LoopEnd - pos; DataSize = minu(BufferSize, DataSize); LoadStack(&SrcData[SrcDataSize*NumChannels], &Data[pos*FrameSize], ALBuffer->FmtType, DataSize*NumChannels); SrcDataSize += DataSize; BufferSize -= DataSize; DataSize = LoopEnd-LoopStart; while(BufferSize > 0) { DataSize = minu(BufferSize, DataSize); LoadStack(&SrcData[SrcDataSize*NumChannels], &Data[LoopStart*FrameSize], ALBuffer->FmtType, DataSize*NumChannels); SrcDataSize += DataSize; BufferSize -= DataSize; } } } else { /* Crawl the buffer queue to fill in the temp buffer */ ALbufferlistitem *BufferListIter = BufferListItem; ALuint pos; if(DataPosInt >= BufferPrePadding) pos = DataPosInt - BufferPrePadding; else { pos = BufferPrePadding - DataPosInt; while(pos > 0) { if(!BufferListIter->prev && !Looping) { ALuint DataSize = minu(BufferSize, pos); SilenceStack(&SrcData[SrcDataSize*NumChannels], DataSize*NumChannels); SrcDataSize += DataSize; BufferSize -= DataSize; pos = 0; break; } if(BufferListIter->prev) BufferListIter = BufferListIter->prev; else { while(BufferListIter->next) BufferListIter = BufferListIter->next; } if(BufferListIter->buffer) { if((ALuint)BufferListIter->buffer->SampleLen > pos) { pos = BufferListIter->buffer->SampleLen - pos; break; } pos -= BufferListIter->buffer->SampleLen; } } } while(BufferListIter && BufferSize > 0) { const ALbuffer *ALBuffer; if((ALBuffer=BufferListIter->buffer) != NULL) { const ALubyte *Data = ALBuffer->data; ALuint DataSize = ALBuffer->SampleLen; /* Skip the data already played */ if(DataSize <= pos) pos -= DataSize; else { Data += pos*FrameSize; DataSize -= pos; pos -= pos; DataSize = minu(BufferSize, DataSize); LoadStack(&SrcData[SrcDataSize*NumChannels], Data, ALBuffer->FmtType, DataSize*NumChannels); SrcDataSize += DataSize; BufferSize -= DataSize; } } BufferListIter = BufferListIter->next; if(!BufferListIter && Looping) BufferListIter = Source->queue; else if(!BufferListIter) { SilenceStack(&SrcData[SrcDataSize*NumChannels], BufferSize*NumChannels); SrcDataSize += BufferSize; BufferSize -= BufferSize; } } } /* Figure out how many samples we can mix. */ DataSize64 = SrcDataSize; DataSize64 -= BufferPadding+BufferPrePadding; DataSize64 <<= FRACTIONBITS; DataSize64 -= increment; DataSize64 -= DataPosFrac; BufferSize = (ALuint)((DataSize64+(increment-1)) / increment); BufferSize = minu(BufferSize, (SamplesToDo-OutPos)); SrcData += BufferPrePadding*NumChannels; Source->Params.DoMix(Source, Device, SrcData, &DataPosInt, &DataPosFrac, OutPos, SamplesToDo, BufferSize); OutPos += 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->SampleLen; LoopStart = ALBuffer->LoopStart; LoopEnd = ALBuffer->LoopEnd; if(LoopEnd > DataPosInt) break; } if(Looping && Source->lSourceType == AL_STATIC) { DataPosInt = ((DataPosInt-LoopStart)%(LoopEnd-LoopStart)) + LoopStart; break; } if(DataSize > DataPosInt) break; if(BufferListItem->next) { BufferListItem = BufferListItem->next; BuffersPlayed++; } else if(Looping) { BufferListItem = Source->queue; BuffersPlayed = 0; } else { State = AL_STOPPED; BufferListItem = Source->queue; BuffersPlayed = Source->BuffersInQueue; DataPosInt = 0; DataPosFrac = 0; break; } DataPosInt -= DataSize; } } while(State == AL_PLAYING && OutPos < SamplesToDo); /* Update source info */ Source->state = State; Source->BuffersPlayed = BuffersPlayed; Source->position = DataPosInt; Source->position_fraction = DataPosFrac; Source->HrtfOffset += OutPos; if(State == AL_PLAYING) { Source->HrtfCounter = maxu(Source->HrtfCounter, OutPos) - OutPos; Source->HrtfMoving = AL_TRUE; } else { Source->HrtfCounter = 0; Source->HrtfMoving = AL_FALSE; } }