public MediaReader(Stream inputStream) : base(inputStream)
{
try {
if (!inputStream.CanRead)
{
throw new ArgumentException($"流不能被读取，请确保Stream.CanRead为true");
}
int resultCode;
fixed(AVFormatContext **pFormatContext = &formatContext)
{
resultCode = FF.avformat_open_input(pFormatContext, null, null, null);
}
if (resultCode != 0)
{
throw new FFmpegException(resultCode);
}
resultCode = FF.avformat_find_stream_info(formatContext, null);
if (resultCode != 0)
{
throw new FFmpegException(resultCode);
}
var decoders = new Decoder[StreamCount];
for (int i = 0; i < StreamCount; i++)
{
decoders[i] = Decoder.Create(formatContext->Streams[i]);
if (formatContext->Streams[i]->Codec->CodecType == AVMediaType.Video)
{
FramesPerSecond = formatContext->Streams[i]->AvgFrameRate.Value;
VideoStreamIndex = i;
// defaultStreamIndex = i;
}
formatContext->Streams[i]->CurDts = 0;
}
Decoders = decoders;
Duration = new Timestamp(formatContext->Duration, Timestamp.FFmpeg_AVTimeBase);
} catch {
Dispose();
throw;
}
}
