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;
}
}
///// <summary>
///// 创建一个封装模式的媒体写入器
///// </summary>
///// <param name="file"></param>
///// <param name="mediaReader"></param>
//public MediaWriter(string file, MediaReader mediaReader)
// : base(File.Open(file, FileMode.Create, FileAccess.Write), true, FF.av_guess_format(null, file, null)) {
// outputFormat = formatContext->Oformat;
// remuxing = true;
// SetEncoders(mediaReader);
//}
///// <summary>
///// 创建一个封装模式的媒体写入器
///// </summary>
///// <param name="outputStream"></param>
///// <param name="mediaName"></param>
///// <param name="mediaReader"></param>
//public MediaWriter(Stream outputStream, string mediaName, MediaReader mediaReader)
// : base(outputStream, true, FF.av_guess_format(mediaName, null, null)) {
// outputFormat = formatContext->Oformat;
// remuxing = true;
// SetEncoders(mediaReader);
//}
//private void SetEncoders(MediaReader mediaReader) {
// try {
// foreach (var decoder in mediaReader.Decoders) {
// if (decoder != null) {
// var stream = FF.avformat_new_stream(formatContext, decoder.codec);
// if (stream == null) throw new InvalidOperationException("无法创建流");
// int result = FF.avcodec_copy_context(stream->Codec, decoder.codecContext);
// if (result < 0) throw new FFmpegException(result);
// stream->Codec->CodecTag = 0;
// if (outputFormat->Flags.HasFlag(AVFmt.GlobalHeader)) {
// stream->Codec->Flags |= AVCodecFlag.GlobalHeader;
// }
// stream->TimeBase = mediaReader.formatContext->Streams[decoder.StreamIndex]->TimeBase;
// //stream->TimeBase = decoder.codecContext->TimeBase;
// result = FF.avcodec_parameters_from_context(stream->Codecpar, stream->Codec);
// if (result < 0) throw new FFmpegException(result);
// }
// }
// inputFmtCtx = mediaReader.formatContext;
// } catch {
// Dispose();
// throw;
// }
//}
public MediaWriter AddAudio(AudioFormat format, BitRate bitRate)
{
if (readyEncoders != null)
{
throw new InvalidOperationException($"该{nameof(MediaWriter)}对象已经初始化");
}
if (outputFormat == null)
{
throw new InvalidOperationException("无法确定媒体的输出格式");
}
if (outputFormat->AudioCodec == AVCodecID.None)
{
throw new InvalidOperationException($"该{nameof(MediaWriter)}对象并不支持音频");
}
var stream = FF.avformat_new_stream(formatContext, Codec.GetEncoder(outputFormat->AudioCodec));
if (stream == null)
{
throw new InvalidOperationException("无法创建流");
}
var codecContext = stream->Codec;
var audioEncoder = new AudioEncoder(stream, format, bitRate);
stream->TimeBase = codecContext->TimeBase;
int result = FF.avcodec_parameters_from_context(stream->Codecpar, codecContext);
if (result < 0)
{
throw new FFmpegException(result);
}
encoders.Add(audioEncoder);
return(this);
}
public MediaWriter AddEncoder(Encoder encoder)
{
if (readyEncoders != null)
{
throw new InvalidOperationException($"该{nameof(MediaWriter)}对象已经初始化");
}
if (outputFormat == null)
{
var desc = FF.avcodec_descriptor_get(encoder.ID);
if (desc == null)
{
throw new InvalidOperationException("无法获得编码器的短名称描述");
}
outputFormat = FF.av_guess_format(desc->Name, null, null);
if (outputFormat == null)
{
throw new InvalidOperationException("无法确定媒体的输出格式");
}
formatContext->Oformat = outputFormat;
}
var stream = FF.avformat_new_stream(formatContext, encoder.codec);
if (stream == null)
{
throw new InvalidOperationException("无法创建流");
}
// stream->TimeBase = encoder.codecContext->TimeBase;
int result = FF.avcodec_parameters_from_context(stream->Codecpar, encoder.codecContext);
if (result < 0)
{
throw new FFmpegException(result);
}
encoder.stream = stream;
encoders.Add(encoder);
return(this);
}
