用C#做一个拉流播放器

做拉流播放器第一个想到就是,.,..FFmpeg没错我也是用强大的他它来做的.但是我用的不是 cmd 调用而是用的强大的FFmpeg.AutoGen

FFmpeg.AutoGen

这个是C# 一个自动生成FFmpeg的C#库,它之强大令人侧目,但是文档资料非常少,它能用C# 办到一切C++原生ffmpeg的功能

,或许说用C#来实现了一遍ffmpeg ?!?,不同于外部命令调用它直接用指针来操纵流上的一段代码

这是一段转码过程

public H264VideoStreamEncoder(Stream stream, int fps, Size frameSize)
{
    _stream = stream;
    _frameSize = frameSize;
 
    var codecId = AVCodecID.AV_CODEC_ID_H264;
    _pCodec = ffmpeg.avcodec_find_encoder(codecId);
    if (_pCodec == null) throw new InvalidOperationException("Codec not found.");
 
    _pCodecContext = ffmpeg.avcodec_alloc_context3(_pCodec);
    _pCodecContext->width = frameSize.Width;
    _pCodecContext->height = frameSize.Height;
    _pCodecContext->time_base = new AVRational {num = 1, den = fps};
    _pCodecContext->pix_fmt = AVPixelFormat.AV_PIX_FMT_YUV420P;
    ffmpeg.av_opt_set(_pCodecContext->priv_data, "preset", "veryslow", 0);
 
    ffmpeg.avcodec_open2(_pCodecContext, _pCodec, null).ThrowExceptionIfError();
 
    _linesizeY = frameSize.Width;
    _linesizeU = frameSize.Width / 2;
    _linesizeV = frameSize.Width / 2;
 
    _ySize = _linesizeY * frameSize.Height;
    _uSize = _linesizeU * frameSize.Height / 2;
}