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 override void Convert(AudioFrame inFrame, AudioFrame outFrame)
{
if (kernelCount > 1 && kernelCount != inFrame.format.Channels)
{
throw new ArgumentException($"{nameof(inFrame)}的数据行数和卷积核个数不一致", nameof(inFrame));
}
var inFormat = inFrame.format;
var inSamples = inFrame.sampleCount;
var outSamples = convs[0].GetOutLength(inSamples);
var outFormat = inFormat;
if (resampler == null && inFormat.SampleFormat != AVSampleFormat.DoublePlanar)
{
outFormat = new AudioFormat(inFormat.SampleRate, inFormat.ChannelLayout, inFormat.SampleFormat.ToPlanar());
resampler = new AudioResampler(inFormat, outFormat);
}
if (resampler != null)
{
resampler.Resample(inFrame, tempInput);
inFrame = tempInput;
}
outFrame.Resize(outFormat, outSamples);
for (int i = 0; i < kernelCount; i++)
{
convs[kernelCount == 1 ? 0 : i].Convolve((double *)inFrame.datas[i], inSamples, (double *)outFrame.datas[i], outSamples);
}
}
public static void ToPacked(AudioFrame inOutFrame)
{
AudioResampler resampler = GetPackedResampler(inOutFrame.format);
if (resampler == null)
{
return;
}
var samples = inOutFrame.SampleCount;
int bytes = resampler.GetOutBytes(samples);
packedCache.Resize(bytes);
var data = packedCache.data;
fixed(IntPtr *input = inOutFrame.datas)
{
resampler.Resample((IntPtr)input, samples, (IntPtr)(&data), samples);
}
inOutFrame.format = resampler.Destination;
inOutFrame.Update(samples, packedCache.data);
}
public override bool Encode(Frame frame, Packet outPacket)
{
if (frame != null)
{
if (!(frame is AudioFrame))
{
throw new ArgumentException($"{nameof(frame)}必须是{nameof(AudioFrame)}类型", nameof(frame));
}
if (!(frame as AudioFrame).format.Equals(InFormat))
{
throw new ArgumentException("输入帧的格式和编码器输入格式不同");
}
}
if (resampler != null)
{
if (frame != null)
{
resampler.Resample(frame as AudioFrame, tempFrame);
frame = tempFrame;
}
else
{
resampler.ResampleFinal(tempFrame);
if (tempFrame.SampleCount > 0)
{
frame = tempFrame;
}
}
}
encodeFrames = 0;
outPacket.ReleaseNativeBuffer();
int gotPicture = 0;
if (frame != null)
{
try {
frame.SetupToNative();
frame.presentTimestamp = new Timestamp(inputFrames, new AVRational(1, OutFormat.SampleRate));
frame.presentTimestamp.Transform(codecContext->TimeBase);
frame.frame->Pts = frame.presentTimestamp.Value;
FF.avcodec_encode_audio2(codecContext, outPacket.packet, frame.frame, &gotPicture).CheckFFmpegCode("音频编码发生错误");
} finally {
frame.ReleaseSetup();
}
encodeFrames = frame.frame->NbSamples;
inputFrames += encodeFrames;
}
else
{
FF.avcodec_encode_audio2(codecContext, outPacket.packet, null, &gotPicture).CheckFFmpegCode("音频编码发生错误");
}
if (gotPicture != 0)
{
ConfigPakcet(outPacket);
return(true);
}
return(false);
}