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unit Uffmpeg;
interface
uses SDL, UGraphicClasses, textgl, avcodec, avformat, avutil, math, OpenGL12, SysUtils, UIni, dialogs;
procedure Init;
procedure FFmpegOpenFile(FileName: pAnsiChar);
procedure FFmpegClose;
procedure FFmpegGetFrame(Time: Extended);
procedure FFmpegDrawGL;
procedure FFmpegTogglePause;
procedure FFmpegSkip(Time: Single);
var
VideoOpened, VideoPaused: Boolean;
VideoFormatContext: PAVFormatContext;
VideoStreamIndex: Integer;
VideoCodecContext: PAVCodecContext;
VideoCodec: PAVCodec;
AVFrame: PAVFrame;
AVFrameRGB: PAVFrame;
myBuffer: pByte;
VideoTex: glUint;
TexX, TexY, dataX, dataY: Cardinal;
TexData: array of Byte;
ScaledVideoWidth, ScaledVideoHeight: Real;
VideoAspect: Real;
VideoTextureU, VideoTextureV: Real;
VideoTimeBase, VideoTime, LastFrameTime, TimeDifference: Extended;
VideoSkipTime: Single;
implementation
const DebugDisplay=True;
procedure Init;
begin
av_register_all;
VideoOpened:=False;
VideoPaused:=False;
glGenTextures(1, PglUint(@VideoTex));
SetLength(TexData,0);
end;
procedure FFmpegOpenFile(FileName: pAnsiChar);
var errnum, i, x,y: Integer;
begin
VideoOpened:=False;
VideoPaused:=False;
VideoTimeBase:=0;
VideoTime:=0;
LastFrameTime:=0;
TimeDifference:=0;
errnum:=av_open_input_file(VideoFormatContext, FileName, Nil, 0, Nil);
if(errnum <> 0)
then begin
case errnum of
AVERROR_UNKNOWN: showmessage('failed to open file '+Filename+#13#10+'AVERROR_UNKNOWN');
AVERROR_IO: showmessage('failed to open file '+Filename+#13#10+'AVERROR_IO');
AVERROR_NUMEXPECTED: showmessage('failed to open file '+Filename+#13#10+'AVERROR_NUMEXPECTED');
AVERROR_INVALIDDATA: showmessage('failed to open file '+Filename+#13#10+'AVERROR_INVALIDDATA');
AVERROR_NOMEM: showmessage('failed to open file '+Filename+#13#10+'AVERROR_NOMEM');
AVERROR_NOFMT: showmessage('failed to open file '+Filename+#13#10+'AVERROR_NOFMT');
AVERROR_NOTSUPP: showmessage('failed to open file '+Filename+#13#10+'AVERROR_NOTSUPP');
else showmessage('failed to open file '+Filename+#13#10+'Error number: '+inttostr(Errnum));
end;
Exit;
end
else begin
VideoStreamIndex:=-1;
if(av_find_stream_info(VideoFormatContext)>=0) then
begin
for i:=0 to VideoFormatContext^.nb_streams-1 do
if(VideoFormatContext^.streams[i]^.codec^.codec_type=CODEC_TYPE_VIDEO) then begin
VideoStreamIndex:=i;
end else
end;
if(VideoStreamIndex >= 0) then
begin
VideoCodecContext:=VideoFormatContext^.streams[VideoStreamIndex]^.codec;
VideoCodec:=avcodec_find_decoder(VideoCodecContext^.codec_id);
end else showmessage('found no video stream');
if(VideoCodec<>Nil) then
begin
errnum:=avcodec_open(VideoCodecContext, VideoCodec);
end else showmessage('no matching codec found');
if(errnum >=0) then
begin
showmessage('Found a matching Codec:'+#13#10#13#10+
'Width='+inttostr(VideoCodecContext^.width)+
', Height='+inttostr(VideoCodecContext^.height)+#13#10+
'Aspect: '+inttostr(VideoCodecContext^.sample_aspect_ratio.num)+'/'+inttostr(VideoCodecContext^.sample_aspect_ratio.den)+#13#10+
'Framerate: '+inttostr(VideoCodecContext^.time_base.num)+'/'+inttostr(VideoCodecContext^.time_base.den));
// allocate space for decoded frame and rgb frame
AVFrame:=avcodec_alloc_frame;
AVFrameRGB:=avcodec_alloc_frame;
end;
myBuffer:=Nil;
if(AVFrame <> Nil) and (AVFrameRGB <> Nil) then
begin
myBuffer:=av_malloc(avpicture_get_size(PIX_FMT_RGB24, VideoCodecContext^.width,
VideoCodecContext^.height));
end;
if myBuffer <> Nil then errnum:=avpicture_fill(PAVPicture(AVFrameRGB), myBuffer, PIX_FMT_RGB24,
VideoCodecContext^.width, VideoCodecContext^.height)
else showmessage('failed to allocate video buffer');
if errnum >=0 then
begin
VideoOpened:=True;
TexX := VideoCodecContext^.width;
TexY := VideoCodecContext^.height;
dataX := Round(Power(2, Ceil(Log2(TexX))));
dataY := Round(Power(2, Ceil(Log2(TexY))));
SetLength(TexData,dataX*dataY*3);
// calculate some information for video display
VideoAspect:=VideoCodecContext^.sample_aspect_ratio.num/VideoCodecContext^.sample_aspect_ratio.den;
if (VideoAspect = 0) then
VideoAspect:=VideoCodecContext^.width/VideoCodecContext^.height
else
VideoAspect:=VideoAspect*VideoCodecContext^.width/VideoCodecContext^.height;
if VideoAspect >= 4/3 then
begin
ScaledVideoWidth:=800.0;
ScaledVideoHeight:=800.0/VideoAspect;
end else
begin
ScaledVideoHeight:=600.0;
ScaledVideoWidth:=600.0*VideoAspect;
end;
VideoTimeBase:=VideoCodecContext^.time_base.num/VideoCodecContext^.time_base.den;
if (VideoAspect*VideoCodecContext^.width*VideoCodecContext^.height)>200000 then
showmessage('you are trying to play a rather large video'+#13#10+
'be prepared to experience some timing problems');
end;
end;
end;
procedure FFmpegClose;
begin
if VideoOpened then begin
av_free(myBuffer);
av_free(AVFrameRGB);
av_free(AVFrame);
avcodec_close(VideoCodecContext);
av_close_input_file(VideoFormatContext);
SetLength(TexData,0);
VideoOpened:=False;
end;
end;
procedure FFmpegTogglePause;
begin
if VideoPaused then VideoPaused:=False
else VideoPaused:=True;
end;
procedure FFmpegSkip(Time: Single);
begin
VideoSkiptime:=Time;
end;
procedure FFmpegGetFrame(Time: Extended);
var
FrameFinished: Integer;
AVPacket: TAVPacket;
errnum, x, y: Integer;
FrameDataPtr: PByteArray;
linesize: integer;
myTime: Extended;
begin
if not VideoOpened then Exit;
if VideoPaused then Exit;
myTime:=Time+VideoSkipTime;
TimeDifference:=myTime-VideoTime;
{ showmessage('Time: '+inttostr(floor(Time*1000))+#13#10+
'VideoTime: '+inttostr(floor(VideoTime*1000))+#13#10+
'TimeBase: '+inttostr(floor(VideoTimeBase*1000))+#13#10+
'TimeDiff: '+inttostr(floor(TimeDifference*1000)));
}
if (VideoTime <> 0) and (TimeDifference <= VideoTimeBase) then begin
if DebugDisplay then GoldenRec.Spawn(200,15,1,16,0,-1,ColoredStar,$00ff00);
{ showmessage('not getting new frame'+#13#10+
'Time: '+inttostr(floor(Time*1000))+#13#10+
'VideoTime: '+inttostr(floor(VideoTime*1000))+#13#10+
'TimeBase: '+inttostr(floor(VideoTimeBase*1000))+#13#10+
'TimeDiff: '+inttostr(floor(TimeDifference*1000)));
}
Exit;// we don't need a new frame now
end;
VideoTime:=VideoTime+VideoTimeBase;
TimeDifference:=myTime-VideoTime;
if TimeDifference >= 3*VideoTimeBase then begin // skip frames
if DebugDisplay then GoldenRec.Spawn(200,35,1,16,0,-1,ColoredStar,$ff0000);
// showmessage('skipping frames'+#13#10+
// 'TimeBase: '+inttostr(floor(VideoTimeBase*1000))+#13#10+
// 'TimeDiff: '+inttostr(floor(TimeDifference*1000))+#13#10+
// 'Time2Skip: '+inttostr(floor((Time-LastFrameTime)*1000)));
// av_seek_frame(VideoFormatContext,VideoStreamIndex,Floor(Time*VideoTimeBase),0);
av_seek_frame(VideoFormatContext,-1,Floor((myTime)*1100000),0);
VideoTime:=floor(myTime/VideoTimeBase)*VideoTimeBase;
end;
FrameFinished:=0;
// read packets until we have a finished frame (or there are no more packets)
while (FrameFinished=0) and (av_read_frame(VideoFormatContext, @AVPacket)>=0) do
begin
// if we got a packet from the video stream, then decode it
if (AVPacket.stream_index=VideoStreamIndex) then
errnum:=avcodec_decode_video(VideoCodecContext, AVFrame, @frameFinished,
AVPacket.data, AVPacket.size);
// release internal packet structure created by av_read_frame
av_free_packet(PAVPacket(@AVPacket));
end;
// if we did not get an new frame, there's nothing more to do
if Framefinished=0 then Exit;
// otherwise we convert the pixeldata from YUV to RGB
errnum:=img_convert(PAVPicture(AVFrameRGB), PIX_FMT_RGB24,
PAVPicture(AVFrame), VideoCodecContext^.pix_fmt,
VideoCodecContext^.width, VideoCodecContext^.height);
if errnum >=0 then begin
// copy RGB pixeldata to our TextureBuffer
// (line by line)
FrameDataPtr:=AVFrameRGB^.data[0];
linesize:=AVFrameRGB^.linesize[0];
for y:=0 to TexY-1 do begin
System.Move(FrameDataPtr[y*linesize],TexData[3*y*dataX],linesize);
end;
// generate opengl texture out of whatever we got
glBindTexture(GL_TEXTURE_2D, VideoTex);
glTexImage2D(GL_TEXTURE_2D, 0, 3, dataX, dataY, 0, GL_RGB, GL_UNSIGNED_BYTE, TexData);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
end;
end;
procedure FFmpegDrawGL;
begin
if not VideoOpened then Exit;
glEnable(GL_TEXTURE_2D);
glEnable(GL_BLEND);
glColor4f(1, 1, 1, 1);
glBindTexture(GL_TEXTURE_2D, VideoTex);
glbegin(gl_quads);
glTexCoord2f( 0, 0); glVertex2f(400-ScaledVideoWidth/2, 300-ScaledVideoHeight/2);
glTexCoord2f( 0, TexY/dataY); glVertex2f(400-ScaledVideoWidth/2, 300+ScaledVideoHeight/2);
glTexCoord2f(TexX/dataX, TexY/dataY); glVertex2f(400+ScaledVideoWidth/2, 300+ScaledVideoHeight/2);
glTexCoord2f(TexX/dataX, 0); glVertex2f(400+ScaledVideoWidth/2, 300-ScaledVideoHeight/2);
glEnd;
glDisable(GL_TEXTURE_2D);
glDisable(GL_BLEND);
if DebugDisplay then begin
SetFontStyle (2);
SetFontItalic(False);
SetFontSize(9);
SetFontPos (5, 0);
glPrint('delaying frame');
SetFontPos (5, 20);
glPrint('dropping frame');
end;
end;
end.
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