CARingBufferError CARingBuffer::Store(const AudioBufferList *abl, UInt32 framesToWrite, SampleTime startWrite)
{
if (framesToWrite > mCapacityFrames)
return kCARingBufferError_TooMuch; // too big!
SampleTime endWrite = startWrite + framesToWrite;
if (startWrite < EndTime()) {
// going backwards, throw everything out
SetTimeBounds(startWrite, startWrite);
} else if (endWrite - StartTime() <= mCapacityFrames) {
// the buffer has not yet wrapped and will not need to
} else {
// advance the start time past the region we are about to overwrite
SampleTime newStart = endWrite - mCapacityFrames; // one buffer of time behind where we're writing
SampleTime newEnd = std::max(newStart, EndTime());
SetTimeBounds(newStart, newEnd);
}
// write the new frames
Byte **buffers = mBuffers;
int nchannels = mNumberChannels;
int offset0, offset1, nbytes;
SampleTime curEnd = EndTime();
if (startWrite > curEnd) {
// we are skipping some samples, so zero the range we are skipping
offset0 = FrameOffset(curEnd);
offset1 = FrameOffset(startWrite);
if (offset0 < offset1)
ZeroRange(buffers, nchannels, offset0, offset1 - offset0);
else {
ZeroRange(buffers, nchannels, offset0, mCapacityBytes - offset0);
ZeroRange(buffers, nchannels, 0, offset1);
}
offset0 = offset1;
} else {
offset0 = FrameOffset(startWrite);
}
offset1 = FrameOffset(endWrite);
if (offset0 < offset1)
StoreABL(buffers, offset0, abl, 0, offset1 - offset0);
else {
nbytes = mCapacityBytes - offset0;
StoreABL(buffers, offset0, abl, 0, nbytes);
StoreABL(buffers, 0, abl, nbytes, offset1);
}
// now update the end time
SetTimeBounds(StartTime(), endWrite);
return kCARingBufferError_OK; // success
}
FSTCARingBufferError FSTCARingBuffer::Store(const AudioBufferList *abl, UInt32 framesToWrite, SampleTime startWrite)
{
if (framesToWrite > mCapacityFrames)
return kFSTCARingBufferError_TooMuch; // too big!
if(startWrite > mCapacityFrames)
return kFSTCARingBufferError_CPUOverload;
SampleTime endWrite = startWrite + framesToWrite;
if (startWrite < EndTime())
{
// going backwards, throw everything out
SetTimeBounds(startWrite, startWrite);
}
else if (endWrite - StartTime() <= mCapacityFrames)
{
// the buffer has not yet wrapped and will not need to
}
else
{
// advance the start time past the region we are about to overwrite
SampleTime newStart = endWrite - mCapacityFrames; // one buffer of time behind where we're writing
SampleTime newEnd = std::max(newStart, EndTime());
SetTimeBounds(newStart, newEnd);
}
int idx, offset0, offset1, nbytes;
SampleTime curEnd = EndTime();
if(mBufferList)
{
int numBuffs = abl->mNumberBuffers;
if(numBuffs > mBufferList->mNumberBuffers)
numBuffs = mBufferList->mNumberBuffers;
for(idx=0; idx<numBuffs; idx++)
{
AudioBuffer * buffer = &mBufferList->mBuffers[idx];
mCapacityBytes = sizeof(float)*buffer->mNumberChannels * mCapacityFrames;
if (startWrite > curEnd)
{
// we are skipping some samples, so zero the range we are skipping
offset0 = curEnd * sizeof(float) * buffer->mNumberChannels;
offset1 = startWrite * sizeof(float) * buffer->mNumberChannels;
if (offset0 < offset1)
{
ZeroRangeAB(buffer, offset0, offset1 - offset0);
}
else
{
ZeroRangeAB(buffer, offset0, mCapacityBytes - offset0);
ZeroRangeAB(buffer, 0, offset1);
}
offset0 = offset1;
}
else
{
offset0 = startWrite * sizeof(float) * buffer->mNumberChannels;
}
offset1 = endWrite * sizeof(float) * buffer->mNumberChannels;
if (offset0 < offset1)
StoreAB(buffer, offset0, &abl->mBuffers[idx], 0, offset1 - offset0);
else
{
nbytes = mCapacityBytes - offset0;
StoreAB(buffer, offset0, &abl->mBuffers[idx], 0, nbytes);
StoreAB(buffer, 0, &abl->mBuffers[idx], nbytes, offset1);
}
}
}
else
{
// write the new frames
Byte **buffers = mBuffers;
int nchannels = mNumberChannels;
if (startWrite > curEnd)
{
// we are skipping some samples, so zero the range we are skipping
offset0 = FrameOffset(curEnd);
offset1 = FrameOffset(startWrite);
if (offset0 < offset1)
ZeroRange(buffers, nchannels, offset0, offset1 - offset0);
else
{
ZeroRange(buffers, nchannels, offset0, mCapacityBytes - offset0);
ZeroRange(buffers, nchannels, 0, offset1);
}
offset0 = offset1;
}
else
{
offset0 = FrameOffset(startWrite);
}
offset1 = FrameOffset(endWrite);
if (offset0 < offset1)
StoreBufs(buffers, offset0, abl, 0, offset1 - offset0);
else
{
nbytes = mCapacityBytes - offset0;
StoreBufs(buffers, offset0, abl, 0, nbytes);
StoreBufs(buffers, 0, abl, nbytes, offset1);
}
}
// now update the end time
SetTimeBounds(StartTime(), endWrite);
return kFSTCARingBufferError_OK; // success
}
