public void Properties_ReturnsNativeValues()
{
var nativeCodecParameters = new NativeAVCodecParameters
{
codec_type = NativeAVMediaType.AVMEDIA_TYPE_VIDEO,
codec_id = NativeAVCodecID.AV_CODEC_ID_4XM,
format = 124,
};
var codecParameters = new AVCodecParameters(&nativeCodecParameters);
Assert.Equal(NativeAVMediaType.AVMEDIA_TYPE_VIDEO, codecParameters.Type);
Assert.Equal(NativeAVCodecID.AV_CODEC_ID_4XM, codecParameters.Id);
Assert.Equal(124, codecParameters.Format);
}
// sets up libavformat state: creates the AVFormatContext, the frames, etc. to start decoding, but does not actually start the decodingLoop
private void prepareDecoding()
{
const int context_buffer_size = 4096;
// the first call to FFmpeg will throw an exception if the libraries cannot be found
// this will be safely handled in StartDecoding()
var fcPtr = ffmpeg.avformat_alloc_context();
formatContext = fcPtr;
contextBuffer = (byte *)ffmpeg.av_malloc(context_buffer_size);
managedContextBuffer = new byte[context_buffer_size];
readPacketCallback = readPacket;
seekCallback = streamSeekCallbacks;
formatContext->pb = ffmpeg.avio_alloc_context(contextBuffer, context_buffer_size, 0, (void *)handle.Handle, readPacketCallback, null, seekCallback);
int openInputResult = ffmpeg.avformat_open_input(&fcPtr, "dummy", null, null);
inputOpened = openInputResult >= 0;
if (!inputOpened)
{
throw new InvalidOperationException($"Error opening file or stream: {getErrorMessage(openInputResult)}");
}
int findStreamInfoResult = ffmpeg.avformat_find_stream_info(formatContext, null);
if (findStreamInfoResult < 0)
{
throw new InvalidOperationException($"Error finding stream info: {getErrorMessage(findStreamInfoResult)}");
}
var nStreams = formatContext->nb_streams;
for (var i = 0; i < nStreams; ++i)
{
stream = formatContext->streams[i];
codecParams = *stream->codecpar;
if (codecParams.codec_type == AVMediaType.AVMEDIA_TYPE_VIDEO)
{
duration = stream->duration <= 0 ? formatContext->duration : stream->duration;
timeBaseInSeconds = stream->time_base.GetValue();
var codecPtr = ffmpeg.avcodec_find_decoder(codecParams.codec_id);
if (codecPtr == null)
{
throw new InvalidOperationException($"Couldn't find codec with id: {codecParams.codec_id}");
}
int openCodecResult = ffmpeg.avcodec_open2(stream->codec, codecPtr, null);
if (openCodecResult < 0)
{
throw new InvalidOperationException($"Error trying to open codec with id {codecParams.codec_id}: {getErrorMessage(openCodecResult)}");
}
break;
}
}
prepareFilters();
}
// sets up libavformat state: creates the AVFormatContext, the frames, etc. to start decoding, but does not actually start the decodingLoop
private void prepareDecoding()
{
const int context_buffer_size = 4096;
var fcPtr = ffmpeg.avformat_alloc_context();
formatContext = fcPtr;
contextBuffer = (byte *)ffmpeg.av_malloc(context_buffer_size);
managedContextBuffer = new byte[context_buffer_size];
readPacketCallback = readPacket;
seekCallback = seek;
formatContext->pb = ffmpeg.avio_alloc_context(contextBuffer, context_buffer_size, 0, null, readPacketCallback, null, seekCallback);
if (ffmpeg.avformat_open_input(&fcPtr, "dummy", null, null) < 0)
{
throw new Exception("Error opening file.");
}
if (ffmpeg.avformat_find_stream_info(formatContext, null) < 0)
{
throw new Exception("Could not find stream info.");
}
var nStreams = formatContext->nb_streams;
for (var i = 0; i < nStreams; ++i)
{
stream = formatContext->streams[i];
codecParams = *stream->codecpar;
if (codecParams.codec_type == AVMediaType.AVMEDIA_TYPE_VIDEO)
{
timeBaseInSeconds = stream->time_base.GetValue();
var codecPtr = ffmpeg.avcodec_find_decoder(codecParams.codec_id);
if (codecPtr == null)
{
throw new Exception("Could not find codec.");
}
if (ffmpeg.avcodec_open2(stream->codec, codecPtr, null) < 0)
{
throw new Exception("Could not open codec.");
}
frame = ffmpeg.av_frame_alloc();
frameRgb = ffmpeg.av_frame_alloc();
uncompressedFrameSize = ffmpeg.av_image_get_buffer_size(AVPixelFormat.AV_PIX_FMT_RGBA, codecParams.width, codecParams.height, 1);
frameRgbBufferPtr = Marshal.AllocHGlobal(uncompressedFrameSize);
var dataArr4 = *(byte_ptrArray4 *)&frameRgb->data;
var linesizeArr4 = *(int_array4 *)&frameRgb->linesize;
var result = ffmpeg.av_image_fill_arrays(ref dataArr4, ref linesizeArr4, (byte *)frameRgbBufferPtr, AVPixelFormat.AV_PIX_FMT_RGBA, codecParams.width, codecParams.height, 1);
if (result < 0)
{
throw new Exception("Could not fill image arrays");
}
for (uint j = 0; j < byte_ptrArray4.Size; ++j)
{
frameRgb->data[j] = dataArr4[j];
frameRgb->linesize[j] = linesizeArr4[j];
}
break;
}
}
}
