public void Seek(TimeSpan seekToIn)
{
long positionInBaseUnits = (long)(seekToIn.TotalSeconds * ffmpeg.AV_TIME_BASE);
int errorCode = ffmpeg.av_seek_frame(this.avFormatContextPtr, -1, positionInBaseUnits, ffmpeg.AVSEEK_FLAG_BACKWARD);
FFmpegWrapperException.ThrowInCaseOfError(errorCode);
}
public bool TryRead(out MediaPacket mediaPacketOut)
{
AVPacket *packetPtr = ffmpeg.av_packet_alloc();
int errorCode = ffmpeg.av_read_frame(this.avFormatContextPtr, packetPtr);
if (errorCode == ffmpeg.AVERROR_EOF)
{
ffmpeg.av_packet_unref(packetPtr);
ffmpeg.av_free(packetPtr);
mediaPacketOut = null;
return(false);
}
try
{
FFmpegWrapperException.ThrowInCaseOfError(errorCode);
}
catch
{
ffmpeg.av_packet_unref(packetPtr);
ffmpeg.av_free(packetPtr);
throw;
}
mediaPacketOut = new MediaPacket(packetPtr, Streams[packetPtr->stream_index]);
return(true);
}
public InputMediaFile(string filePath)
{
if (!File.Exists(filePath))
{
throw new ArgumentException($"The file ({filePath}) does not exists!", nameof(filePath));
}
int errorCode;
fixed(AVFormatContext **formatContextPointerPointer = &this.avFormatContextPtr)
{
errorCode = ffmpeg.avformat_open_input(formatContextPointerPointer, filePath, null, null);
FFmpegWrapperException.ThrowInCaseOfError(errorCode);
}
errorCode = ffmpeg.avformat_find_stream_info(this.avFormatContextPtr, null);
FFmpegWrapperException.ThrowInCaseOfError(errorCode);
Streams = CreateStreams();
MediaStream firstVideoStream = Streams.FirstOrDefault(s => s.CodecType == MediaType.AVMEDIA_TYPE_VIDEO);
if (firstVideoStream == null)
{
throw new NotSupportedException($"The video file ({filePath}) does not contain video stream!");
}
FrameTime = TimeSpan.FromSeconds(1 / firstVideoStream.FrameRate.Value);
}
public OutputMediaFile(string fileNameIn)
{
try
{
fixed(AVIOContext **avioContextPtrPtr = &this.avioContextPtr)
{
int error = ffmpeg.avio_open(avioContextPtrPtr, fileNameIn, ffmpeg.AVIO_FLAG_WRITE);
FFmpegWrapperException.ThrowInCaseOfError(error);
}
fixed(AVFormatContext **formatContextPtrPtr = &this.avFormatContextPtr)
{
int error = ffmpeg.avformat_alloc_output_context2(formatContextPtrPtr, null, null, fileNameIn);
FFmpegWrapperException.ThrowInCaseOfError(error);
this.avFormatContextPtr->pb = avioContextPtr;
}
}
catch
{
ReleaseTheUnmanagedResources();
throw;
}
}
public void WriteHeader()
{
if (Streams == null)
{
throw new InvalidOperationException("Streams were not added yet!");
}
int error = ffmpeg.avformat_write_header(this.avFormatContextPtr, null);
FFmpegWrapperException.ThrowInCaseOfError(error);
}
public void WriteTailer()
{
int error = ffmpeg.av_write_trailer(this.avFormatContextPtr);
FFmpegWrapperException.ThrowInCaseOfError(error);
}
public void WritePacket(MediaPacket packetIn)
{
int error = ffmpeg.av_write_frame(this.avFormatContextPtr, packetIn.PacketPtr);
FFmpegWrapperException.ThrowInCaseOfError(error);
}
