private void NewStreams(Codec[] codecs)
{
try {
foreach (var codec in codecs)
{
var stream = FF.avformat_new_stream(formatContext, codec.codec);
if (stream == null)
{
throw new InvalidOperationException("无法创建流");
}
FF.avcodec_copy_context(stream->Codec, codec.codecContext).CheckFFmpegCode();
stream->Codec->CodecTag = 0;
if (outputFormat->Flags.HasFlag(AVFmt.GlobalHeader))
{
stream->Codec->Flags |= AVCodecFlag.GlobalHeader;
}
stream->TimeBase = codec.codecContext->TimeBase;
FF.avcodec_parameters_from_context(stream->Codecpar, stream->Codec).CheckFFmpegCode();
}
FF.avformat_write_header(formatContext, null).CheckFFmpegCode();
} catch {
Dispose();
throw;
}
}
public MediaWriter Initialize()
{
if (readyEncoders != null)
{
throw new InvalidOperationException($"该{nameof(MediaWriter)}对象已经初始化");
}
if (outputFormat == null)
{
throw new InvalidOperationException("无法确定媒体的输出格式");
}
int result = FF.avformat_write_header(formatContext, null);
if (result < 0)
{
throw new FFmpegException(result, "写入头部错误");
}
readyEncoders = new List <Encoder>(encoders);
fixedQueues = new FixedAudioFrameQueue[encoders.Count];
for (int i = 0; i < encoders.Count; i++)
{
if (encoders[i] is AudioEncoder audioEncoder)
{
fixedQueues[i] = new FixedAudioFrameQueue(audioEncoder.RequestSamples);
}
}
return(this);
}
