105 lines
1.9 KiB
C++
105 lines
1.9 KiB
C++
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#include "audiostream_rif.h"
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#include "stdclass.h"
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#include "oslib/oslib.h"
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//cResetEvent speed_limit(true,true);
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struct SoundFrame { s16 l;s16 r; };
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#define SAMPLE_COUNT 512
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SoundFrame RingBuffer[SAMPLE_COUNT];
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const u32 RingBufferByteSize = sizeof(RingBuffer);
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const u32 RingBufferSampleCount = SAMPLE_COUNT;
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volatile u32 WritePtr; //last WRITEN sample
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volatile u32 ReadPtr; //next sample to read
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u32 gen_samples=0;
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double time_diff, time_last;
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#ifdef LOG_SOUND
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WaveWriter rawout("d:\\aica_out.wav");
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#endif
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u32 os_Push(void* frame, u32 amt, bool wait);
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//void os_Pull(u32 level)
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u32 asRingUsedCount()
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{
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if (WritePtr>ReadPtr)
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return WritePtr-ReadPtr;
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else
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return RingBufferSampleCount-(ReadPtr-WritePtr);
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//s32 sz=(WritePtr+1)%RingBufferSampleCount-ReadPtr;
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//return sz<0?sz+RingBufferSampleCount:sz;
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}
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u32 asRingFreeCount()
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{
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return RingBufferSampleCount-asRingUsedCount();
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}
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void WriteSample(s16 r, s16 l)
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{
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#if 0
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#if HOST_OS==OS_WINDOWS
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#ifdef LOG_SOUND
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rawout.Write(l,r);
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#endif
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if (!asRingFreeCount())
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{
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//printf("Buffer overrun\n");
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if (settings.aica.LimitFPS)
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{
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//speed_limit.Wait();
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}
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else
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return;
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}
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gen_samples++;
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//while limit on, 128 samples done, there is a buffer ready to be service AND speed is too fast then wait
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if (settings.aica.LimitFPS==1 && gen_samples>128)
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{
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for(;asRingUsedCount()>BufferSampleCount && (os_GetSeconds()-time_last)<=time_diff;)
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;
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gen_samples=0;
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time_last=os_GetSeconds();
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}
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#else
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if (!asRingFreeCount())
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{
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if (settings.aica.LimitFPS)
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{
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while(!asRingFreeCount()) ;
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}
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else
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return;
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}
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#endif
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#endif
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const u32 ptr=(WritePtr+1)%RingBufferSampleCount;
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RingBuffer[ptr].r=r;
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RingBuffer[ptr].l=l;
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WritePtr=ptr;
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if (WritePtr==(SAMPLE_COUNT-1))
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{
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os_Push(RingBuffer,SAMPLE_COUNT,settings.aica.LimitFPS);
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}
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}
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void InitAudio()
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{
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time_diff=128/44100.0;
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}
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void TermAudio()
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{
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}
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