public bool Open(string path)
{
Reset();
int ret;
ret = FFmpeg.av_open_input_file(out pFormatContext, path, IntPtr.Zero, 0, IntPtr.Zero);
if (ret < 0)
{
Console.WriteLine("couldn't opne input file");
return(false);
}
ret = FFmpeg.av_find_stream_info(pFormatContext);
if (ret < 0)
{
Console.WriteLine("couldnt find stream informaion");
return(false);
}
formatContext = (FFmpeg.AVFormatContext)
Marshal.PtrToStructure(pFormatContext, typeof(FFmpeg.AVFormatContext));
for (int i = 0; i < formatContext.nb_streams; ++i)
{
FFmpeg.AVStream stream = (FFmpeg.AVStream)
Marshal.PtrToStructure(formatContext.streams[i], typeof(FFmpeg.AVStream));
FFmpeg.AVCodecContext codec = (FFmpeg.AVCodecContext)
Marshal.PtrToStructure(stream.codec, typeof(FFmpeg.AVCodecContext));
if (codec.codec_type == FFmpeg.CodecType.CODEC_TYPE_AUDIO &&
audioStartIndex == -1)
{
//this.pAudioCodecContext = stream.codec;
//this.pAudioStream = formatContext.streams[i];
this.audioCodecContext = codec;
this.audioStartIndex = i;
this.timebase = stream.time_base;
pAudioCodec = FFmpeg.avcodec_find_decoder(this.audioCodecContext.codec_id);
if (pAudioCodec == IntPtr.Zero)
{
Console.WriteLine("couldn't find codec");
return(false);
}
FFmpeg.avcodec_open(stream.codec, pAudioCodec);
}
}
if (audioStartIndex == -1)
{
Console.WriteLine("Couldn't find audio streamn");
return(false);
}
audioSampleRate = audioCodecContext.sample_rate;
if (audioCodecContext.channels == 1)
{
//format = Al.AL_FORMAT_MONO16;
}
else
{
//format = Al.AL_FORMAT_STEREO16;
}
return(true);
}
private static double av_q2d(FFmpeg.AVRational a)
{
return((double)a.num / (double)a.den);
}
