diff options
Diffstat (limited to 'cmake/src/media/UVideo.pas')
| -rw-r--r-- | cmake/src/media/UVideo.pas | 954 |
1 files changed, 954 insertions, 0 deletions
diff --git a/cmake/src/media/UVideo.pas b/cmake/src/media/UVideo.pas new file mode 100644 index 00000000..35f8ab4d --- /dev/null +++ b/cmake/src/media/UVideo.pas @@ -0,0 +1,954 @@ +{* UltraStar Deluxe - Karaoke Game + * + * UltraStar Deluxe is the legal property of its developers, whose names + * are too numerous to list here. Please refer to the COPYRIGHT + * file distributed with this source distribution. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version 2 + * of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; see the file COPYING. If not, write to + * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, + * Boston, MA 02110-1301, USA. + * + * $URL$ + * $Id$ + *} + +unit UVideo; + +{* + * based on 'An ffmpeg and SDL Tutorial' (http://www.dranger.com/ffmpeg/) + *} + +// uncomment if you want to see the debug stuff +{.$define DebugDisplay} +{.$define DebugFrames} +{.$define VideoBenchmark} +{.$define Info} + +interface + +{$IFDEF FPC} + {$MODE Delphi} +{$ENDIF} + +{$I switches.inc} + +// use BGR-format for accelerated colorspace conversion with swscale +{$IFDEF UseSWScale} + {$DEFINE PIXEL_FMT_BGR} +{$ENDIF} + +type + {** + * vacStretch: Stretch to screen width and height + * - ignores aspect + * + no borders + * + no image data loss + * vacCrop: Stretch to screen width or height, crop the other dimension + * + keeps aspect + * + no borders + * - frame borders are cropped (image data loss) + * vacLetterBox: Stretch to screen width, add bars at or crop top and bottom + * + keeps aspect + * - borders at top and bottom + * o top/bottom is cropped if width < height (unusual) + *} + TAspectCorrection = (acoStretch, acoCrop, acoLetterBox); + + +implementation + +uses + SDL, + textgl, + avcodec, + avformat, + avutil, + avio, + rational, + {$IFDEF UseSWScale} + swscale, + {$ENDIF} + UMediaCore_FFmpeg, + math, + gl, + glext, + SysUtils, + UCommon, + UConfig, + ULog, + UMusic, + UGraphicClasses, + UGraphic; + +const +{$IFDEF PIXEL_FMT_BGR} + PIXEL_FMT_OPENGL = GL_BGR; + PIXEL_FMT_FFMPEG = PIX_FMT_BGR24; +{$ELSE} + PIXEL_FMT_OPENGL = GL_RGB; + PIXEL_FMT_FFMPEG = PIX_FMT_RGB24; +{$ENDIF} + +type + TRectCoords = record + Left, Right: double; + Upper, Lower: double; + end; + + TVideoPlayback_FFmpeg = class( TInterfacedObject, IVideoPlayback ) + private + fOpened: boolean; //**< stream successfully opened + fPaused: boolean; //**< stream paused + fInitialized: boolean; + fEOF: boolean; //**< end-of-file state + + fLoop: boolean; //**< looping enabled + + fStream: PAVStream; + fStreamIndex : integer; + fFormatContext: PAVFormatContext; + fCodecContext: PAVCodecContext; + fCodec: PAVCodec; + + fAVFrame: PAVFrame; + fAVFrameRGB: PAVFrame; + + fFrameBuffer: PByte; //**< stores a FFmpeg video frame + fFrameTex: GLuint; //**< OpenGL texture for FrameBuffer + fFrameTexValid: boolean; //**< if true, fFrameTex contains the current frame + fTexWidth, fTexHeight: cardinal; + + {$IFDEF UseSWScale} + fSwScaleContext: PSwsContext; + {$ENDIF} + + fAspect: real; //**< width/height ratio + fAspectCorrection: TAspectCorrection; + + fTimeBase: extended; //**< FFmpeg time base per time unit + fTime: extended; //**< video time position (absolute) + fLoopTime: extended; //**< start time of the current loop + + procedure Reset(); + function DecodeFrame(): boolean; + procedure SynchronizeTime(Frame: PAVFrame; var pts: double); + + procedure GetVideoRect(var ScreenRect, TexRect: TRectCoords); + + procedure ShowDebugInfo(); + + public + function GetName: String; + + function Init(): boolean; + function Finalize: boolean; + + function Open(const aFileName : string): boolean; // true if succeed + procedure Close; + + procedure Play; + procedure Pause; + procedure Stop; + + procedure SetPosition(Time: real); + function GetPosition: real; + + procedure GetFrame(Time: Extended); + procedure DrawGL(Screen: integer); + end; + +var + FFmpegCore: TMediaCore_FFmpeg; + + +// These are called whenever we allocate a frame buffer. +// We use this to store the global_pts in a frame at the time it is allocated. +function PtsGetBuffer(CodecCtx: PAVCodecContext; Frame: PAVFrame): integer; cdecl; +var + pts: Pint64; + VideoPktPts: Pint64; +begin + Result := avcodec_default_get_buffer(CodecCtx, Frame); + VideoPktPts := CodecCtx^.opaque; + if (VideoPktPts <> nil) then + begin + // Note: we must copy the pts instead of passing a pointer, because the packet + // (and with it the pts) might change before a frame is returned by av_decode_video. + pts := av_malloc(sizeof(int64)); + pts^ := VideoPktPts^; + Frame^.opaque := pts; + end; +end; + +procedure PtsReleaseBuffer(CodecCtx: PAVCodecContext; Frame: PAVFrame); cdecl; +begin + if (Frame <> nil) then + av_freep(@Frame^.opaque); + avcodec_default_release_buffer(CodecCtx, Frame); +end; + + +{*------------------------------------------------------------------------------ + * TVideoPlayback_ffmpeg + *------------------------------------------------------------------------------} + +function TVideoPlayback_FFmpeg.GetName: String; +begin + result := 'FFmpeg_Video'; +end; + +function TVideoPlayback_FFmpeg.Init(): boolean; +begin + Result := true; + + if (fInitialized) then + Exit; + fInitialized := true; + + FFmpegCore := TMediaCore_FFmpeg.GetInstance(); + + Reset(); + av_register_all(); + glGenTextures(1, PGLuint(@fFrameTex)); +end; + +function TVideoPlayback_FFmpeg.Finalize(): boolean; +begin + Close(); + glDeleteTextures(1, PGLuint(@fFrameTex)); + Result := true; +end; + +procedure TVideoPlayback_FFmpeg.Reset(); +begin + // close previously opened video + Close(); + + fOpened := False; + fPaused := False; + fTimeBase := 0; + fTime := 0; + fStream := nil; + fStreamIndex := -1; + fFrameTexValid := false; + + fEOF := false; + + // TODO: do we really want this by default? + fLoop := true; + fLoopTime := 0; + + fAspectCorrection := acoCrop; +end; + +function TVideoPlayback_FFmpeg.Open(const aFileName : string): boolean; // true if succeed +var + errnum: Integer; + AudioStreamIndex: integer; +begin + Result := false; + + Reset(); + + errnum := av_open_input_file(fFormatContext, PChar(aFileName), nil, 0, nil); + if (errnum <> 0) then + begin + Log.LogError('Failed to open file "'+aFileName+'" ('+FFmpegCore.GetErrorString(errnum)+')'); + Exit; + end; + + // update video info + if (av_find_stream_info(fFormatContext) < 0) then + begin + Log.LogError('No stream info found', 'TVideoPlayback_ffmpeg.Open'); + Close(); + Exit; + end; + Log.LogInfo('VideoStreamIndex : ' + inttostr(fStreamIndex), 'TVideoPlayback_ffmpeg.Open'); + + // find video stream + FFmpegCore.FindStreamIDs(fFormatContext, fStreamIndex, AudioStreamIndex); + if (fStreamIndex < 0) then + begin + Log.LogError('No video stream found', 'TVideoPlayback_ffmpeg.Open'); + Close(); + Exit; + end; + + fStream := fFormatContext^.streams[fStreamIndex]; + fCodecContext := fStream^.codec; + + fCodec := avcodec_find_decoder(fCodecContext^.codec_id); + if (fCodec = nil) then + begin + Log.LogError('No matching codec found', 'TVideoPlayback_ffmpeg.Open'); + Close(); + Exit; + end; + + // set debug options + fCodecContext^.debug_mv := 0; + fCodecContext^.debug := 0; + + // detect bug-workarounds automatically + fCodecContext^.workaround_bugs := FF_BUG_AUTODETECT; + // error resilience strategy (careful/compliant/agressive/very_aggressive) + //fCodecContext^.error_resilience := FF_ER_CAREFUL; //FF_ER_COMPLIANT; + // allow non spec compliant speedup tricks. + //fCodecContext^.flags2 := fCodecContext^.flags2 or CODEC_FLAG2_FAST; + + // Note: avcodec_open() and avcodec_close() are not thread-safe and will + // fail if called concurrently by different threads. + FFmpegCore.LockAVCodec(); + try + errnum := avcodec_open(fCodecContext, fCodec); + finally + FFmpegCore.UnlockAVCodec(); + end; + if (errnum < 0) then + begin + Log.LogError('No matching codec found', 'TVideoPlayback_ffmpeg.Open'); + Close(); + Exit; + end; + + // register custom callbacks for pts-determination + fCodecContext^.get_buffer := PtsGetBuffer; + fCodecContext^.release_buffer := PtsReleaseBuffer; + + {$ifdef DebugDisplay} + DebugWriteln('Found a matching Codec: '+ fCodecContext^.Codec.Name + sLineBreak + + sLineBreak + + ' Width = '+inttostr(fCodecContext^.width) + + ', Height='+inttostr(fCodecContext^.height) + sLineBreak + + ' Aspect : '+inttostr(fCodecContext^.sample_aspect_ratio.num) + '/' + + inttostr(fCodecContext^.sample_aspect_ratio.den) + sLineBreak + + ' Framerate : '+inttostr(fCodecContext^.time_base.num) + '/' + + inttostr(fCodecContext^.time_base.den)); + {$endif} + + // allocate space for decoded frame and rgb frame + fAVFrame := avcodec_alloc_frame(); + fAVFrameRGB := avcodec_alloc_frame(); + fFrameBuffer := av_malloc(avpicture_get_size(PIXEL_FMT_FFMPEG, + fCodecContext^.width, fCodecContext^.height)); + + if ((fAVFrame = nil) or (fAVFrameRGB = nil) or (fFrameBuffer = nil)) then + begin + Log.LogError('Failed to allocate buffers', 'TVideoPlayback_ffmpeg.Open'); + Close(); + Exit; + end; + + // TODO: pad data for OpenGL to GL_UNPACK_ALIGNMENT + // (otherwise video will be distorted if width/height is not a multiple of the alignment) + errnum := avpicture_fill(PAVPicture(fAVFrameRGB), fFrameBuffer, PIXEL_FMT_FFMPEG, + fCodecContext^.width, fCodecContext^.height); + if (errnum < 0) then + begin + Log.LogError('avpicture_fill failed: ' + FFmpegCore.GetErrorString(errnum), 'TVideoPlayback_ffmpeg.Open'); + Close(); + Exit; + end; + + // calculate some information for video display + fAspect := av_q2d(fCodecContext^.sample_aspect_ratio); + if (fAspect = 0) then + fAspect := fCodecContext^.width / + fCodecContext^.height + else + fAspect := fAspect * fCodecContext^.width / + fCodecContext^.height; + + fTimeBase := 1/av_q2d(fStream^.r_frame_rate); + + // hack to get reasonable timebase (for divx and others) + if (fTimeBase < 0.02) then // 0.02 <-> 50 fps + begin + fTimeBase := av_q2d(fStream^.r_frame_rate); + while (fTimeBase > 50) do + fTimeBase := fTimeBase/10; + fTimeBase := 1/fTimeBase; + end; + + Log.LogInfo('VideoTimeBase: ' + floattostr(fTimeBase), 'TVideoPlayback_ffmpeg.Open'); + Log.LogInfo('Framerate: '+inttostr(floor(1/fTimeBase))+'fps', 'TVideoPlayback_ffmpeg.Open'); + + {$IFDEF UseSWScale} + // if available get a SWScale-context -> faster than the deprecated img_convert(). + // SWScale has accelerated support for PIX_FMT_RGB32/PIX_FMT_BGR24/PIX_FMT_BGR565/PIX_FMT_BGR555. + // Note: PIX_FMT_RGB32 is a BGR- and not an RGB-format (maybe a bug)!!! + // The BGR565-formats (GL_UNSIGNED_SHORT_5_6_5) is way too slow because of its + // bad OpenGL support. The BGR formats have MMX(2) implementations but no speed-up + // could be observed in comparison to the RGB versions. + fSwScaleContext := sws_getContext( + fCodecContext^.width, fCodecContext^.height, + fCodecContext^.pix_fmt, + fCodecContext^.width, fCodecContext^.height, + PIXEL_FMT_FFMPEG, + SWS_FAST_BILINEAR, nil, nil, nil); + if (fSwScaleContext = nil) then + begin + Log.LogError('Failed to get swscale context', 'TVideoPlayback_ffmpeg.Open'); + Close(); + Exit; + end; + {$ENDIF} + + fTexWidth := Round(Power(2, Ceil(Log2(fCodecContext^.width)))); + fTexHeight := Round(Power(2, Ceil(Log2(fCodecContext^.height)))); + + // we retrieve a texture just once with glTexImage2D and update it with glTexSubImage2D later. + // Benefits: glTexSubImage2D is faster and supports non-power-of-two widths/height. + glBindTexture(GL_TEXTURE_2D, fFrameTex); + glTexEnvi(GL_TEXTURE_2D, GL_TEXTURE_ENV_MODE, GL_REPLACE); + glTexImage2D(GL_TEXTURE_2D, 0, 3, fTexWidth, fTexHeight, 0, + PIXEL_FMT_OPENGL, GL_UNSIGNED_BYTE, nil); + glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR); + glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR); + + fOpened := True; + Result := true; +end; + +procedure TVideoPlayback_FFmpeg.Close; +begin + if (fFrameBuffer <> nil) then + av_free(fFrameBuffer); + if (fAVFrameRGB <> nil) then + av_free(fAVFrameRGB); + if (fAVFrame <> nil) then + av_free(fAVFrame); + + fAVFrame := nil; + fAVFrameRGB := nil; + fFrameBuffer := nil; + + if (fCodecContext <> nil) then + begin + // avcodec_close() is not thread-safe + FFmpegCore.LockAVCodec(); + try + avcodec_close(fCodecContext); + finally + FFmpegCore.UnlockAVCodec(); + end; + end; + + if (fFormatContext <> nil) then + av_close_input_file(fFormatContext); + + fCodecContext := nil; + fFormatContext := nil; + + fOpened := False; +end; + +procedure TVideoPlayback_FFmpeg.SynchronizeTime(Frame: PAVFrame; var pts: double); +var + FrameDelay: double; +begin + if (pts <> 0) then + begin + // if we have pts, set video clock to it + fTime := pts; + end else + begin + // if we aren't given a pts, set it to the clock + pts := fTime; + end; + // update the video clock + FrameDelay := av_q2d(fCodecContext^.time_base); + // if we are repeating a frame, adjust clock accordingly + FrameDelay := FrameDelay + Frame^.repeat_pict * (FrameDelay * 0.5); + fTime := fTime + FrameDelay; +end; + +{** + * Decode a new frame from the video stream. + * The decoded frame is stored in fAVFrame. fTime is updated to the new frame's + * time. + * @param pts will be updated to the presentation time of the decoded frame. + * returns true if a frame could be decoded. False if an error or EOF occured. + *} +function TVideoPlayback_FFmpeg.DecodeFrame(): boolean; +var + FrameFinished: Integer; + VideoPktPts: int64; + pbIOCtx: PByteIOContext; + errnum: integer; + AVPacket: TAVPacket; + pts: double; +begin + Result := false; + FrameFinished := 0; + + if fEOF then + Exit; + + // read packets until we have a finished frame (or there are no more packets) + while (FrameFinished = 0) do + begin + errnum := av_read_frame(fFormatContext, AVPacket); + if (errnum < 0) then + begin + // failed to read a frame, check reason + + {$IF (LIBAVFORMAT_VERSION_MAJOR >= 52)} + pbIOCtx := fFormatContext^.pb; + {$ELSE} + pbIOCtx := @fFormatContext^.pb; + {$IFEND} + + // check for end-of-file (EOF is not an error) + if (url_feof(pbIOCtx) <> 0) then + begin + fEOF := true; + Exit; + end; + + // check for errors + if (url_ferror(pbIOCtx) <> 0) then + Exit; + + // url_feof() does not detect an EOF for some mov-files (e.g. deluxe.mov) + // so we have to do it this way. + if ((fFormatContext^.file_size <> 0) and + (pbIOCtx^.pos >= fFormatContext^.file_size)) then + begin + fEOF := true; + Exit; + end; + + // no error -> wait for user input +{ + SDL_Delay(100); // initial version, left for documentation + continue; +} + + // Patch by Hawkear: + // Why should this function loop in an endless loop if there is an error? + // This runs in the main thread, so it halts the whole program + // Therefore, it is better to exit when an error occurs + Exit; + + end; + + // if we got a packet from the video stream, then decode it + if (AVPacket.stream_index = fStreamIndex) then + begin + // save pts to be stored in pFrame in first call of PtsGetBuffer() + VideoPktPts := AVPacket.pts; + fCodecContext^.opaque := @VideoPktPts; + + // decode packet + avcodec_decode_video(fCodecContext, fAVFrame, + frameFinished, AVPacket.data, AVPacket.size); + + // reset opaque data + fCodecContext^.opaque := nil; + + // update pts + if (AVPacket.dts <> AV_NOPTS_VALUE) then + begin + pts := AVPacket.dts; + end + else if ((fAVFrame^.opaque <> nil) and + (Pint64(fAVFrame^.opaque)^ <> AV_NOPTS_VALUE)) then + begin + pts := Pint64(fAVFrame^.opaque)^; + end + else + begin + pts := 0; + end; + pts := pts * av_q2d(fStream^.time_base); + + // synchronize time on each complete frame + if (frameFinished <> 0) then + SynchronizeTime(fAVFrame, pts); + end; + + // free the packet from av_read_frame + av_free_packet( @AVPacket ); + end; + + Result := true; +end; + +procedure TVideoPlayback_FFmpeg.GetFrame(Time: Extended); +var + errnum: Integer; + NewTime: Extended; + TimeDifference: Extended; + DropFrameCount: Integer; + i: Integer; + Success: boolean; +const + FRAME_DROPCOUNT = 3; +begin + if not fOpened then + Exit; + + if fPaused then + Exit; + + // requested stream position (relative to the last loop's start) + NewTime := Time - fLoopTime; + + // check if current texture still contains the active frame + if (fFrameTexValid) then + begin + // time since the last frame was returned + TimeDifference := NewTime - fTime; + + {$IFDEF DebugDisplay} + DebugWriteln('Time: '+inttostr(floor(Time*1000)) + sLineBreak + + 'VideoTime: '+inttostr(floor(fTime*1000)) + sLineBreak + + 'TimeBase: '+inttostr(floor(fTimeBase*1000)) + sLineBreak + + 'TimeDiff: '+inttostr(floor(TimeDifference*1000))); + {$endif} + + // check if last time is more than one frame in the past + if (TimeDifference < fTimeBase) then + begin + {$ifdef DebugFrames} + // frame delay debug display + GoldenRec.Spawn(200,15,1,16,0,-1,ColoredStar,$00ff00); + {$endif} + + {$IFDEF DebugDisplay} + DebugWriteln('not getting new frame' + sLineBreak + + 'Time: '+inttostr(floor(Time*1000)) + sLineBreak + + 'VideoTime: '+inttostr(floor(fTime*1000)) + sLineBreak + + 'TimeBase: '+inttostr(floor(fTimeBase*1000)) + sLineBreak + + 'TimeDiff: '+inttostr(floor(TimeDifference*1000))); + {$endif} + + // we do not need a new frame now + Exit; + end; + end; + + {$IFDEF VideoBenchmark} + Log.BenchmarkStart(15); + {$ENDIF} + + // fetch new frame (updates fTime) + Success := DecodeFrame(); + TimeDifference := NewTime - fTime; + + // check if we have to skip frames + if (TimeDifference >= FRAME_DROPCOUNT*fTimeBase) then + begin + {$IFDEF DebugFrames} + //frame drop debug display + GoldenRec.Spawn(200,55,1,16,0,-1,ColoredStar,$ff0000); + {$ENDIF} + {$IFDEF DebugDisplay} + DebugWriteln('skipping frames' + sLineBreak + + 'TimeBase: '+inttostr(floor(fTimeBase*1000)) + sLineBreak + + 'TimeDiff: '+inttostr(floor(TimeDifference*1000))); + {$endif} + + // update video-time + DropFrameCount := Trunc(TimeDifference / fTimeBase); + fTime := fTime + DropFrameCount*fTimeBase; + + // skip half of the frames, this is much smoother than to skip all at once + for i := 1 to DropFrameCount (*div 2*) do + Success := DecodeFrame(); + end; + + // check if we got an EOF or error + if (not Success) then + begin + if fLoop then + begin + // we have to loop, so rewind + SetPosition(0); + // record the start-time of the current loop, so we can + // determine the position in the stream (fTime-fLoopTime) later. + fLoopTime := Time; + end; + Exit; + end; + + // TODO: support for pan&scan + //if (fAVFrame.pan_scan <> nil) then + //begin + // Writeln(Format('PanScan: %d/%d', [fAVFrame.pan_scan.width, fAVFrame.pan_scan.height])); + //end; + + // otherwise we convert the pixeldata from YUV to RGB + {$IFDEF UseSWScale} + errnum := sws_scale(fSwScaleContext, @(fAVFrame.data), @(fAVFrame.linesize), + 0, fCodecContext^.Height, + @(fAVFrameRGB.data), @(fAVFrameRGB.linesize)); + {$ELSE} + errnum := img_convert(PAVPicture(fAVFrameRGB), PIXEL_FMT_FFMPEG, + PAVPicture(fAVFrame), fCodecContext^.pix_fmt, + fCodecContext^.width, fCodecContext^.height); + {$ENDIF} + + if (errnum < 0) then + begin + Log.LogError('Image conversion failed', 'TVideoPlayback_ffmpeg.GetFrame'); + Exit; + end; + + {$IFDEF VideoBenchmark} + Log.BenchmarkEnd(15); + Log.BenchmarkStart(16); + {$ENDIF} + + // TODO: data is not padded, so we will need to tell OpenGL. + // Or should we add padding with avpicture_fill? (check which one is faster) + //glPixelStorei(GL_UNPACK_ALIGNMENT, 1); + + glBindTexture(GL_TEXTURE_2D, fFrameTex); + glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, + fCodecContext^.width, fCodecContext^.height, + PIXEL_FMT_OPENGL, GL_UNSIGNED_BYTE, fAVFrameRGB^.data[0]); + + if (not fFrameTexValid) then + fFrameTexValid := true; + + {$ifdef DebugFrames} + //frame decode debug display + GoldenRec.Spawn(200, 35, 1, 16, 0, -1, ColoredStar, $ffff00); + {$endif} + + {$IFDEF VideoBenchmark} + Log.BenchmarkEnd(16); + Log.LogBenchmark('FFmpeg', 15); + Log.LogBenchmark('Texture', 16); + {$ENDIF} +end; + +procedure TVideoPlayback_FFmpeg.GetVideoRect(var ScreenRect, TexRect: TRectCoords); +var + ScreenAspect: double; // aspect of screen resolution + ScaledVideoWidth, ScaledVideoHeight: double; +begin + // Three aspects to take into account: + // 1. Screen/display resolution (e.g. 1920x1080 -> 16:9) + // 2. Render aspect (fixed to 800x600 -> 4:3) + // 3. Movie aspect (video frame aspect stored in fAspect) + ScreenAspect := ScreenW / ScreenH; + + case fAspectCorrection of + acoStretch: begin + ScaledVideoWidth := RenderW; + ScaledVideoHeight := RenderH; + end; + acoCrop: begin + if (ScreenAspect >= fAspect) then + begin + ScaledVideoWidth := RenderW; + ScaledVideoHeight := RenderH * ScreenAspect/fAspect; + end + else + begin + ScaledVideoHeight := RenderH; + ScaledVideoWidth := RenderW * fAspect/ScreenAspect; + end; + end; + acoLetterBox: begin + ScaledVideoWidth := RenderW; + ScaledVideoHeight := RenderH * ScreenAspect/fAspect; + end + else + raise Exception.Create('Unhandled aspect correction!'); + end; + + // center video + ScreenRect.Left := (RenderW - ScaledVideoWidth) / 2; + ScreenRect.Right := ScreenRect.Left + ScaledVideoWidth; + ScreenRect.Upper := (RenderH - ScaledVideoHeight) / 2; + ScreenRect.Lower := ScreenRect.Upper + ScaledVideoHeight; + + // texture contains right/lower (power-of-2) padding. + // Determine the texture coords of the video frame. + TexRect.Left := 0; + TexRect.Right := fCodecContext^.width / fTexWidth; + TexRect.Upper := 0; + TexRect.Lower := fCodecContext^.height / fTexHeight; +end; + +procedure TVideoPlayback_FFmpeg.DrawGL(Screen: integer); +var + ScreenRect: TRectCoords; + TexRect: TRectCoords; +begin + // have a nice black background to draw on + // (even if there were errors opening the vid) + // TODO: Philipp: IMO TVideoPlayback should not clear the screen at + // all, because clearing is already done by the background class + // at this moment. + if (Screen = 1) then + begin + // It is important that we just clear once before we start + // drawing the first screen otherwise the first screen + // would be cleared by the drawgl called when the second + // screen is drawn + glClearColor(0, 0, 0, 0); + glClear(GL_COLOR_BUFFER_BIT or GL_DEPTH_BUFFER_BIT); + end; + + // exit if there's nothing to draw + if (not fOpened) then + Exit; + + {$IFDEF VideoBenchmark} + Log.BenchmarkStart(15); + {$ENDIF} + + // get texture and screen positions + GetVideoRect(ScreenRect, TexRect); + + // we could use blending for brightness control, but do we need this? + glDisable(GL_BLEND); + + glEnable(GL_TEXTURE_2D); + glBindTexture(GL_TEXTURE_2D, fFrameTex); + glColor3f(1, 1, 1); + glBegin(GL_QUADS); + // upper-left coord + glTexCoord2f(TexRect.Left, TexRect.Upper); + glVertex2f(ScreenRect.Left, ScreenRect.Upper); + // lower-left coord + glTexCoord2f(TexRect.Left, TexRect.Lower); + glVertex2f(ScreenRect.Left, ScreenRect.Lower); + // lower-right coord + glTexCoord2f(TexRect.Right, TexRect.Lower); + glVertex2f(ScreenRect.Right, ScreenRect.Lower); + // upper-right coord + glTexCoord2f(TexRect.Right, TexRect.Upper); + glVertex2f(ScreenRect.Right, ScreenRect.Upper); + glEnd; + glDisable(GL_TEXTURE_2D); + + {$IFDEF VideoBenchmark} + Log.BenchmarkEnd(15); + Log.LogBenchmark('DrawGL', 15); + {$ENDIF} + + {$IF Defined(Info) or Defined(DebugFrames)} + ShowDebugInfo(); + {$IFEND} +end; + +procedure TVideoPlayback_FFmpeg.ShowDebugInfo(); +begin + {$IFDEF Info} + if (fTime+fTimeBase < 0) then + begin + glColor4f(0.7, 1, 0.3, 1); + SetFontStyle (1); + SetFontItalic(False); + SetFontSize(27); + SetFontPos (300, 0); + glPrint('Delay due to negative VideoGap'); + glColor4f(1, 1, 1, 1); + end; + {$ENDIF} + + {$IFDEF DebugFrames} + glColor4f(0, 0, 0, 0.2); + glbegin(GL_QUADS); + glVertex2f(0, 0); + glVertex2f(0, 70); + glVertex2f(250, 70); + glVertex2f(250, 0); + glEnd; + + glColor4f(1, 1, 1, 1); + SetFontStyle (1); + SetFontItalic(False); + SetFontSize(27); + SetFontPos (5, 0); + glPrint('delaying frame'); + SetFontPos (5, 20); + glPrint('fetching frame'); + SetFontPos (5, 40); + glPrint('dropping frame'); + {$ENDIF} +end; + +procedure TVideoPlayback_FFmpeg.Play; +begin +end; + +procedure TVideoPlayback_FFmpeg.Pause; +begin + fPaused := not fPaused; +end; + +procedure TVideoPlayback_FFmpeg.Stop; +begin +end; + +{** + * Sets the stream's position. + * The stream is set to the first keyframe with timestamp <= Time. + * Note that fTime is set to Time no matter if the actual position seeked to is + * at Time or the time of a preceding keyframe. fTime will be updated to the + * actual frame time when GetFrame() is called the next time. + * @param Time new position in seconds + *} +procedure TVideoPlayback_FFmpeg.SetPosition(Time: real); +var + SeekFlags: integer; +begin + if not fOpened then + Exit; + + if (Time < 0) then + Time := 0; + + // TODO: handle fLoop-times + //Time := Time mod VideoDuration; + + // Do not use the AVSEEK_FLAG_ANY here. It will seek to any frame, even + // non keyframes (P-/B-frames). It will produce corrupted video frames as + // FFmpeg does not use the information of the preceding I-frame. + // The picture might be gray or green until the next keyframe occurs. + // Instead seek the first keyframe smaller than the requested time + // (AVSEEK_FLAG_BACKWARD). As this can be some seconds earlier than the + // requested time, let the sync in GetFrame() do its job. + SeekFlags := AVSEEK_FLAG_BACKWARD; + + fTime := Time; + fEOF := false; + fFrameTexValid := false; + + if (av_seek_frame(fFormatContext, fStreamIndex, Floor(Time/fTimeBase), SeekFlags) < 0) then + begin + Log.LogError('av_seek_frame() failed', 'TVideoPlayback_ffmpeg.SetPosition'); + Exit; + end; + + avcodec_flush_buffers(fCodecContext); +end; + +function TVideoPlayback_FFmpeg.GetPosition: real; +begin + Result := fTime; +end; + +initialization + MediaManager.Add(TVideoPlayback_FFmpeg.Create); + +end. |