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);
}
public MediaRemuxer(Stream outputStream, string mediaName = null, params Codec[] codecs)
: base(outputStream, true, FF.av_guess_format(mediaName, null, null))
{
outputFormat = formatContext->Oformat;
NewStreams(codecs);
}
public MediaRemuxer(string file, params Codec[] codecs)
: base(File.Open(file, FileMode.Create, FileAccess.Write), true, FF.av_guess_format(null, file, null))
{
outputFormat = formatContext->Oformat;
NewStreams(codecs);
}
/// <summary>
/// 创建一个编码模式的媒体写入器
/// </summary>
/// <param name="outputStream">输出的流</param>
/// <param name="mediaName">根据"mp3","flac","h264"等多媒体的短名称自动推断编码器</param>
public MediaWriter(Stream outputStream, string mediaName = null)
: base(outputStream, true, FF.av_guess_format(mediaName, null, null))
{
outputFormat = formatContext->Oformat;
}
//public AVCodecID AudioCodecID => remuxing ? inputFmtCtx->AudioCodecId : outputFormat->AudioCodec;
//public AVCodecID VideoCodecID => remuxing ? inputFmtCtx->VideoCodecId : outputFormat->VideoCodec;
/// <summary>
/// 创建一个编码模式的媒体写入器
/// </summary>
/// <param name="file">输出的文件路径</param>
/// <param name="ignoreExtension">如果为true，则不会根据文件扩展名自动推断编码器</param>
public MediaWriter(string file, bool ignoreExtension = false)
: base(File.Open(file, FileMode.Create, FileAccess.Write), true, FF.av_guess_format(null, ignoreExtension ? null : file, null))
{
outputFormat = formatContext->Oformat;
}
