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#include "pch.h"
#include "SampleCorrection.h"
namespace SaneAudioRenderer
{
void SampleCorrection::NewFormat(SharedWaveFormat format)
{
assert(format);
assert(format->nSamplesPerSec > 0);
if (m_format)
{
m_segmentTimeInPreviousFormats += FramesToTime(m_segmentFramesInCurrentFormat);
m_segmentFramesInCurrentFormat = 0;
}
m_format = format;
m_bitstream = (DspFormatFromWaveFormat(*m_format) == DspFormat::Unknown);
}
void SampleCorrection::NewSegment(double rate)
{
assert(rate > 0.0);
m_rate = rate;
m_segmentTimeInPreviousFormats = 0;
m_segmentFramesInCurrentFormat = 0;
m_lastFrameEnd = 0;
m_timeDivergence = 0;
}
void SampleCorrection::NewDeviceBuffer()
{
m_freshBuffer = true;
}
DspChunk SampleCorrection::ProcessSample(IMediaSample* pSample, AM_SAMPLE2_PROPERTIES& sampleProps, bool realtimeDevice)
{
assert(m_format);
DspChunk chunk(pSample, sampleProps, *m_format);
if (m_bitstream)
{
if (m_freshBuffer && !(sampleProps.dwSampleFlags & AM_SAMPLE_SPLICEPOINT))
{
// Drop the sample.
DebugOut("SampleCorrection drop [", sampleProps.tStart, sampleProps.tStop, "]");
chunk = DspChunk();
assert(chunk.IsEmpty());
}
}
else if (!realtimeDevice && (m_lastFrameEnd == 0 || (sampleProps.dwSampleFlags & AM_SAMPLE_TIMEDISCONTINUITY)))
{
if ((sampleProps.dwSampleFlags & AM_SAMPLE_STOPVALID) && sampleProps.tStop <= m_lastFrameEnd)
{
// Drop the sample.
DebugOut("SampleCorrection drop [", sampleProps.tStart, sampleProps.tStop, "]");
chunk = DspChunk();
assert(chunk.IsEmpty());
}
else if ((sampleProps.dwSampleFlags & AM_SAMPLE_TIMEVALID) && sampleProps.tStart < m_lastFrameEnd)
{
// Crop the sample.
const size_t cropFrames = (size_t)TimeToFrames(m_lastFrameEnd - sampleProps.tStart);
if (cropFrames > 0)
{
DebugOut("SampleCorrection crop", cropFrames, "frames from [",
sampleProps.tStart, sampleProps.tStop, "]");
chunk.ShrinkHead(chunk.GetFrameCount() > cropFrames ? chunk.GetFrameCount() - cropFrames : 0);
}
}
else if ((sampleProps.dwSampleFlags & AM_SAMPLE_TIMEVALID) && sampleProps.tStart > m_lastFrameEnd)
{
// Zero-pad the sample.
const size_t padFrames = (size_t)TimeToFrames(sampleProps.tStart - m_lastFrameEnd);
if (padFrames > 0 &&
FramesToTime(padFrames) < 10 * OneSecond)
{
DebugOut("SampleCorrection pad", padFrames, "frames before [",
sampleProps.tStart, sampleProps.tStop, "]");
DspChunk tempChunk(chunk.GetFormat(), chunk.GetChannelCount(),
chunk.GetFrameCount() + padFrames, chunk.GetRate());
const size_t padBytes = padFrames * chunk.GetFrameSize();
sampleProps.pbBuffer = nullptr;
sampleProps.lActual += (int32_t)padBytes;
sampleProps.tStart -= FramesToTime(padFrames);
assert(tempChunk.GetSize() == chunk.GetSize() + padBytes);
ZeroMemory(tempChunk.GetData(), padBytes);
memcpy(tempChunk.GetData() + padBytes, chunk.GetData(), chunk.GetSize());
chunk = std::move(tempChunk);
}
}
}
AccumulateTimings(sampleProps, chunk.GetFrameCount());
return chunk;
}
uint64_t SampleCorrection::TimeToFrames(REFERENCE_TIME time)
{
assert(m_format);
assert(m_rate > 0.0);
return (size_t)(llMulDiv(time, m_format->nSamplesPerSec, OneSecond, 0) * m_rate);
}
REFERENCE_TIME SampleCorrection::FramesToTime(uint64_t frames)
{
assert(m_format);
assert(m_rate > 0.0);
return (REFERENCE_TIME)(llMulDiv(frames, OneSecond, m_format->nSamplesPerSec, 0) / m_rate);
}
void SampleCorrection::AccumulateTimings(AM_SAMPLE2_PROPERTIES& sampleProps, size_t frames)
{
assert(m_format);
assert(m_rate > 0.0);
if (frames == 0)
return;
if (sampleProps.dwSampleFlags & AM_SAMPLE_TIMEVALID)
m_timeDivergence = sampleProps.tStart - m_lastFrameEnd;
m_segmentFramesInCurrentFormat += frames;
m_lastFrameEnd = m_segmentTimeInPreviousFormats + FramesToTime(m_segmentFramesInCurrentFormat);
m_freshBuffer = false;
}
}
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