public static extern int av_picture_pad(AVPicture* dst, AVPicture* src, int height, int width, AVPixelFormat pix_fmt, int padtop, int padbottom, int padleft, int padright, int* color);
public static extern void av_picture_copy(AVPicture* dst, AVPicture* src, AVPixelFormat pix_fmt, int width, int height);
public static extern int av_picture_crop(AVPicture* dst, AVPicture* src, AVPixelFormat pix_fmt, int top_band, int left_band);
public static extern int avpicture_layout(AVPicture* src, AVPixelFormat pix_fmt, int width, int height, sbyte* dest, int dest_size);
public static extern int avpicture_deinterlace(AVPicture* dst, AVPicture* src, AVPixelFormat pix_fmt, int width, int height);
public static extern void avpicture_free(AVPicture* picture);
public static extern int avpicture_fill(AVPicture* picture, byte* ptr, AVPixelFormat pix_fmt, int width, int height);
private unsafe static Bitmap ExtractNextImage(AVFormatContext* pFormatContext, AVCodecContext* pCodecContext, AVPacket* pPacket, AVStream* vidStream, SwsContext* pConvertContext, AVFrame* pDecodedFrame, AVPicture* pConvertedFrame, int width, int height, bool createCopy, double timeBase, out TimeSpan pos)
{
pos = new TimeSpan();
Bitmap result = null;
int gotPicture = 0;
while (gotPicture != 1)
{
if (ffmpeg.av_read_frame(pFormatContext, pPacket) < 0)
{
result = null;
break;
}
if (pPacket->stream_index != vidStream->index)
continue;
gotPicture = 0;
int size = ffmpeg.avcodec_decode_video2(pCodecContext, pDecodedFrame, &gotPicture, pPacket);
if (size < 0)
throw new Exception("Error while decoding frame!");
if (gotPicture == 1)
{
// Get current position from frame
pos = ToTimeSpan(ffmpeg.av_frame_get_best_effort_timestamp(pDecodedFrame), timeBase);
// Extract image
sbyte** src = &pDecodedFrame->data0;
sbyte** dst = &pConvertedFrame->data0;
ffmpeg.sws_scale(pConvertContext, src, pDecodedFrame->linesize, 0, height, dst, pConvertedFrame->linesize);
var imageBufferPtr = new IntPtr(pConvertedFrame->data0);
int linesize = pConvertedFrame->linesize[0];
Bitmap img = new Bitmap(width, height, linesize, PixelFormat.Format24bppRgb, imageBufferPtr);
result = createCopy ? new Bitmap(img) : img;
}
}
return result;
}
public static extern int avpicture_alloc(AVPicture* picture, AVPixelFormat pix_fmt, int width, int height);
public static extern int av_picture_crop(AVPicture* @dst, AVPicture* @src, AVPixelFormat @pix_fmt, int @top_band, int @left_band);
public static extern int av_picture_pad(AVPicture* @dst, AVPicture* @src, int @height, int @width, AVPixelFormat @pix_fmt, int @padtop, int @padbottom, int @padleft, int @padright, int* @color);
public static extern void av_picture_copy(AVPicture* @dst, AVPicture* @src, AVPixelFormat @pix_fmt, int @width, int @height);
public static extern int avpicture_layout(AVPicture* @src, AVPixelFormat @pix_fmt, int @width, int @height, sbyte* @dest, int @dest_size);
public static extern int avpicture_fill(AVPicture* @picture, sbyte* @ptr, AVPixelFormat @pix_fmt, int @width, int @height);
private unsafe Bitmap ExtractNextImage2(AVCodecContext* pCodecContext, AVPacket* pPacket, AVStream* vidStream, SwsContext* pConvertContext, AVFrame* pDecodedFrame, AVPicture* pConvertedFrame, int width, int height, bool createCopy, double timeBase, int? delay, TimeSpan prev, out TimeSpan pos, out bool end)
{
pos = new TimeSpan();
end = false;
Bitmap result = null;
int gotPicture = 0;
while (gotPicture != 1)
{
if (ffmpeg.av_read_frame(this.AVFormatContext, pPacket) < 0)
{
end = true;
result = null;
break;
}
if (pPacket->stream_index != vidStream->index)
continue;
gotPicture = 0;
int size = ffmpeg.avcodec_decode_video2(pCodecContext, pDecodedFrame, &gotPicture, pPacket);
if (size < 0)
throw new Exception("Error while decoding frame!");
if (gotPicture == 1)
{
// Get current position from frame
pos = ToTimeSpan(ffmpeg.av_frame_get_best_effort_timestamp(pDecodedFrame), timeBase);
if (delay.HasValue && prev != TimeSpan.Zero && (pos - prev).TotalMilliseconds < delay)
{
return null;
}
// Extract image
sbyte** src = &pDecodedFrame->data0;
sbyte** dst = &pConvertedFrame->data0;
int src_height = pCodecContext->height;
ffmpeg.sws_scale(pConvertContext, src, pDecodedFrame->linesize, 0, src_height, dst, pConvertedFrame->linesize);
var imageBufferPtr = new IntPtr(pConvertedFrame->data0);
int linesize = pConvertedFrame->linesize[0];
result = new Bitmap(width, height, linesize, PixelFormat.Format24bppRgb, imageBufferPtr);
}
}
return result;
}
public static extern int avpicture_deinterlace(AVPicture* @dst, AVPicture* @src, AVPixelFormat @pix_fmt, int @width, int @height);
