/// <summary>
/// Opens a media container and stream codecs from given stream.
/// </summary>
/// <param name="stream">A stream of the multimedia file.</param>
/// <param name="options">The media settings.</param>
/// <returns>A new instance of the <see cref="InputContainer"/> class.</returns>
public static InputContainer LoadStream(Stream stream, MediaOptions options)
{
return(MakeContainer(null, options, context =>
{
var avioStream = new AvioStream(stream);
// Prevents garbage collection
readCallback = avioStream.Read;
seekCallback = avioStream.Seek;
int bufferLength = 4096;
var avioBuffer = (byte *)ffmpeg.av_malloc((ulong)bufferLength);
context->pb = ffmpeg.avio_alloc_context(avioBuffer, bufferLength, 0, null, readCallback, null, seekCallback);
if (context->pb == null)
{
throw new FFmpegException("Cannot allocate AVIOContext.");
}
}));
}
private static InputContainer MakeContainer(Stream input, MediaOptions options)
{
var avioStream = new AvioStream(input);
var read = (avio_alloc_context_read_packet)avioStream.Read;
var seek = (avio_alloc_context_seek)avioStream.Seek;
var context = MakeContext(null, options, ctx =>
{
int bufferLength = 4096;
var avioBuffer = (byte *)ffmpeg.av_malloc((ulong)bufferLength);
ctx->pb = ffmpeg.avio_alloc_context(avioBuffer, bufferLength, 0, null, read, null, seek);
if (ctx->pb == null)
{
throw new FFmpegException("Cannot allocate AVIOContext.");
}
});
var container = new InputContainer(context, read, seek, options.PacketBufferSizeLimit);
container.OpenStreams(options);
return(container);
}