/// <summary>
/// create audio converter by dst output parames
/// </summary>
/// <param name="dstFormat"></param>
/// <param name="dstChannels"></param>
/// <param name="dstNbSamples"></param>
/// <param name="dstSampleRate"></param>
public SampleConverter(AVSampleFormat dstFormat, int dstChannels, int dstNbSamples, int dstSampleRate)
{
DstFormat = dstFormat;
DstChannels = dstChannels;
DstChannelLayout = FFmpegHelper.GetChannelLayout(dstChannels);
DstNbSamples = dstNbSamples;
DstSampleRate = dstSampleRate;
dstFrame = new AudioFrame(DstChannels, DstNbSamples, DstFormat, DstSampleRate);
AudioFifo = new AudioFifo(DstFormat, DstChannels);
}
/// <summary>
/// create audio converter by dst frame
/// </summary>
/// <param name="dstFrame"></param>
public SampleConverter(AudioFrame dstFrame)
{
ffmpeg.av_frame_make_writable(dstFrame).ThrowIfError();
DstFormat = (AVSampleFormat)dstFrame.AVFrame.format;
DstChannels = dstFrame.AVFrame.channels;
DstChannelLayout = dstFrame.AVFrame.channel_layout;
if (DstChannelLayout == 0)
{
DstChannelLayout = FFmpegHelper.GetChannelLayout(DstChannels);
}
DstNbSamples = dstFrame.AVFrame.nb_samples;
DstSampleRate = dstFrame.AVFrame.sample_rate;
base.dstFrame = dstFrame;
AudioFifo = new AudioFifo(DstFormat, DstChannels);
}
/// <summary>
/// create audio converter by dst codec
/// </summary>
/// <param name="dstCodec"></param>
public SampleConverter(MediaCodec dstCodec)
{
if (dstCodec.Type != AVMediaType.AVMEDIA_TYPE_AUDIO)
{
throw new FFmpegException(FFmpegException.CodecTypeError);
}
DstFormat = dstCodec.AVCodecContext.sample_fmt;
DstChannels = dstCodec.AVCodecContext.channels;
DstChannelLayout = dstCodec.AVCodecContext.channel_layout;
if (DstChannelLayout == 0)
{
DstChannelLayout = FFmpegHelper.GetChannelLayout(DstChannels);
}
DstNbSamples = dstCodec.AVCodecContext.frame_size;
DstSampleRate = dstCodec.AVCodecContext.sample_rate;
dstFrame = new AudioFrame(DstChannels, DstNbSamples, DstFormat, DstSampleRate);
AudioFifo = new AudioFifo(DstFormat, DstChannels);
}
private void SwrCheckInit(MediaFrame srcFrame)
{
if (pSwrContext == null && !isDisposing)
{
AVFrame *src = srcFrame;
AVFrame *dst = dstFrame;
ulong srcChannelLayout = src->channel_layout;
if (srcChannelLayout == 0)
{
srcChannelLayout = FFmpegHelper.GetChannelLayout(src->channels);
}
pSwrContext = ffmpeg.swr_alloc_set_opts(null,
(long)DstChannelLayout, DstFormat, DstSampleRate == 0 ? src->sample_rate : DstSampleRate,
(long)srcChannelLayout, (AVSampleFormat)src->format, src->sample_rate,
0, null);
ffmpeg.swr_init(pSwrContext).ThrowIfError();
}
}
public static MediaEncoder CreateAudioEncode(AVCodecID audioCodec, int flags, int channels, int sampleRate = 0, long bitRate = 0, AVSampleFormat format = AVSampleFormat.AV_SAMPLE_FMT_NONE)
{
return(CreateAudioEncode(audioCodec, flags, FFmpegHelper.GetChannelLayout(channels), sampleRate, bitRate, format));
}