/// <summary>
/// Initializes a new instance of the <see cref="Decoder"/> class.
/// </summary>
/// <param name="codec">The underlying codec.</param>
/// <param name="stream">The multimedia stream.</param>
/// <param name="owner">The container that owns the stream.</param>
public Decoder(AVCodecContext *codec, AVStream *stream, InputContainer owner)
: base(codec)
{
OwnerFile = owner;
Info = StreamInfo.Create(stream, owner);
switch (Info.Type)
{
case MediaType.Audio:
RecentlyDecodedFrame = new AudioFrame();
break;
case MediaType.Video:
RecentlyDecodedFrame = new VideoFrame();
break;
default:
throw new Exception("Tried to create a decoder from an unsupported stream or codec type.");
}
BufferedPackets = new Queue <MediaPacket>();
}
private static InputContainer MakeContainer(string url, MediaOptions options, AVFormatContextDelegate contextDelegate)
{
FFmpegLoader.LoadFFmpeg();
var context = ffmpeg.avformat_alloc_context();
options.DemuxerOptions.ApplyFlags(context);
var dict = new FFDictionary(options.DemuxerOptions.PrivateOptions, false).Pointer;
contextDelegate(context);
ffmpeg.avformat_open_input(&context, url, null, &dict)
.ThrowIfError("An error occurred while opening the file");
ffmpeg.avformat_find_stream_info(context, null)
.ThrowIfError("Cannot find stream info");
var container = new InputContainer(context, options.PacketBufferSizeLimit);
container.OpenStreams(options);
return(container);
}
/// <summary>
/// Opens a media container and stream codecs from given path.
/// </summary>
/// <param name="path">A path to 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 LoadFile(string path, MediaOptions options)
{
MediaToolkit.LoadFFmpeg();
var context = ffmpeg.avformat_alloc_context();
options.DemuxerOptions.ApplyFlags(context);
var dict = new FFDictionary(options.DemuxerOptions.PrivateOptions);
var ptr = dict.Pointer;
ffmpeg.avformat_open_input(&context, path, null, &ptr)
.ThrowIfError("An error ocurred while opening the file");
ffmpeg.avformat_find_stream_info(context, null)
.ThrowIfError("Cannot find stream info");
dict.Update(ptr);
var container = new InputContainer(context);
container.OpenStreams(options);
return(container);
}
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);
}
/// <summary>
/// Initializes a new instance of the <see cref="Decoder{TFrame}"/> class.
/// </summary>
/// <param name="stream">The multimedia stream.</param>
/// <param name="owner">The container that owns the stream.</param>
public Decoder(AVCodecContext *codec, AVStream *stream, InputContainer owner)
: base(codec)
{
OwnerFile = owner;
Info = new StreamInfo(stream, owner);
}