public override void Convert(AudioFrame inFrame, AudioFrame outFrame)
{
if (kernelCount > 1 && kernelCount != inFrame.format.Channels)
{
throw new ArgumentException($"{nameof(inFrame)}的数据行数和卷积核个数不一致", nameof(inFrame));
}
var inFormat = inFrame.format;
var inSamples = inFrame.sampleCount;
var outSamples = convs[0].GetOutLength(inSamples);
var outFormat = inFormat;
if (resampler == null && inFormat.SampleFormat != AVSampleFormat.DoublePlanar)
{
outFormat = new AudioFormat(inFormat.SampleRate, inFormat.ChannelLayout, inFormat.SampleFormat.ToPlanar());
resampler = new AudioResampler(inFormat, outFormat);
}
if (resampler != null)
{
resampler.Resample(inFrame, tempInput);
inFrame = tempInput;
}
outFrame.Resize(outFormat, outSamples);
for (int i = 0; i < kernelCount; i++)
{
convs[kernelCount == 1 ? 0 : i].Convolve((double *)inFrame.datas[i], inSamples, (double *)outFrame.datas[i], outSamples);
}
}
public static void Merge(AudioFrame outFrame, params AudioFrame[] inFrames)
{
if (inFrames.Length == 0)
{
return;
}
var format = inFrames[0].format;
for (int i = 1; i < inFrames.Length; i++)
{
if (format != inFrames[i].format)
{
throw new ArgumentException($"{nameof(inFrames)}的所有元素的{nameof(Format)}必须一致", nameof(inFrames));
}
}
int outSampleCount = inFrames.Sum(frame => frame.sampleCount);
outFrame.format = format;
outFrame.Resize(outSampleCount);
int offset = 0;
for (int i = 0; i < inFrames.Length; i++)
{
FF.av_samples_copy(outFrame.datas, inFrames[i].datas, offset, 0, inFrames[i].sampleCount, format.Channels, format.SampleFormat);
offset += inFrames[i].sampleCount;
}
}
public static void ToPlanar(AudioFrame inOutFrame)
{
AudioResampler resampler = GetPlanarResampler(inOutFrame.format);
if (resampler == null)
{
return;
}
var samples = inOutFrame.SampleCount;
int bytes = resampler.GetOutBytes(samples);
packedCache.Resize(bytes);
var data = packedCache.data;
Buffer.MemoryCopy((void *)inOutFrame.datas[0], (void *)data, bytes, bytes);
int lineBytes = resampler.Destination.GetLineBytes(samples);
inOutFrame.format = resampler.Destination;
inOutFrame.Resize(samples);
fixed(IntPtr *input = inOutFrame.datas)
{
resampler.Resample((IntPtr)(&data), samples, (IntPtr)input, samples);
}
inOutFrame.sampleCount = samples;
}
public void CopyToNoResize(int srcSampleOffset, int srcSampleCount, AudioFrame dstFrame, int dstSampleOffset = 0)
{
if (dstFrame.format != format)
{
throw new ArgumentException("目标帧格式不一致", nameof(dstFrame));
}
FF.av_samples_copy(dstFrame.datas, datas, dstSampleOffset, srcSampleOffset, srcSampleCount, format.Channels, format.SampleFormat);
}
public void ResampleFinal(AudioFrame outFrame)
{
int outSamples = GetOutSampleCount(0);
outFrame.format = Destination;
outFrame.Resize(outSamples);
outSamples = Resample(null, 0, outFrame.datas, outSamples);
outFrame.sampleCount = outSamples;
}
protected override void Dispose(bool disposing)
{
if (disposing)
{
delay?.Dispose();
newInFrame?.Dispose();
delay = null;
newInFrame = null;
}
}
public override void Convert(AudioFrame inFrame, AudioFrame outFrame)
{
if (!inFrame.IsEmpty)
{
Resample(inFrame, outFrame);
}
else
{
ResampleFinal(outFrame);
}
}
protected override void Dispose(bool disposing)
{
if (disposing)
{
resampler?.Dispose();
resampler = null;
tempFrame?.Dispose();
tempFrame = null;
}
base.Dispose(disposing);
}
internal void InternalResample(AudioFrame frame)
{
int inSamples = frame.frame->NbSamples;
int outSamples = GetOutSampleCount(inSamples);
frame.format = Destination;
frame.Resize(outSamples);
fixed(IntPtr *output = frame.datas)
{
outSamples = Resample((IntPtr)frame.frame->ExtendedData, inSamples, (IntPtr)output, outSamples);
}
frame.sampleCount = outSamples;
}
protected override void Dispose(bool disposing)
{
if (disposing)
{
resampler?.Dispose();
tempInput.Dispose();
if (convs != null)
{
Array.ForEach(convs, conv => conv.Dispose());
}
resampler = null;
tempInput = null;
convs = null;
}
}
/*
* [delay data], [in data]
* ↓(merge)
* [new in data(+new delay data)]
* ↓(convert)
* [out data]
*/
public sealed override void Convert(AudioFrame inFrame, AudioFrame outFrame)
{
if (delay == null)
{
delay = new AudioFrame(inFrame.format);
}
if (!delay.IsEmpty)
{
if (newInFrame == null)
{
newInFrame = new AudioFrame();
}
AudioFrame.Merge(newInFrame, delay, inFrame);
inFrame = newInFrame;
}
InternalConvert(inFrame, outFrame, out int delaySampleCount);
delay.sampleCount = delaySampleCount;
inFrame.CopyTo(inFrame.sampleCount - delaySampleCount, delaySampleCount, delay);
}
public void Resample(AudioFrame inFrame, AudioFrame outFrame)
{
if (inFrame == null)
{
ResampleFinal(outFrame);
return;
}
if (!Source.Equals(inFrame.format))
{
throw new ArgumentException("输入帧的格式和重采样器的源格式不一致", nameof(inFrame));
}
int inSamples = inFrame.SampleCount;
int outSamples = GetOutSampleCount(inSamples);
outFrame.format = Destination;
outFrame.Resize(outSamples);
outSamples = Resample(inFrame.datas, inSamples, outFrame.datas, outSamples);
outFrame.sampleCount = outSamples;
}
private void Init(AVCodecID codecID, BitRate bitRate)
{
outFormat = MatchSupportedFormat(codecID, InFormat);
if (!InFormat.Equals(OutFormat))
{
resampler = new AudioResampler(InFormat, OutFormat);
tempFrame = new AudioFrame();
}
codecContext->SampleFmt = outFormat.SampleFormat;
codecContext->SampleRate = outFormat.SampleRate;
codecContext->ChannelLayout = outFormat.ChannelLayout;
codecContext->Channels = outFormat.Channels;
codecContext->BitRate = bitRate.Value;
var rates = codecContext->Flags;
int result = FF.avcodec_open2(codecContext, codec, null);
if (result < 0)
{
throw new FFmpegException(result);
}
}
public static void ToPacked(AudioFrame inOutFrame)
{
AudioResampler resampler = GetPackedResampler(inOutFrame.format);
if (resampler == null)
{
return;
}
var samples = inOutFrame.SampleCount;
int bytes = resampler.GetOutBytes(samples);
packedCache.Resize(bytes);
var data = packedCache.data;
fixed(IntPtr *input = inOutFrame.datas)
{
resampler.Resample((IntPtr)input, samples, (IntPtr)(&data), samples);
}
inOutFrame.format = resampler.Destination;
inOutFrame.Update(samples, packedCache.data);
}
public abstract void Convert(AudioFrame inFrame, AudioFrame outFrame);
protected abstract void InternalConvert(AudioFrame inFrame, AudioFrame outFrame, out int delay);
public void CopyTo(int srcSampleOffset, int srcSampleCount, AudioFrame dstFrame)
{
dstFrame.Resize(format, srcSampleCount);
FF.av_samples_copy(dstFrame.datas, datas, 0, srcSampleOffset, srcSampleCount, format.Channels, format.SampleFormat);
}