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-rw-r--r--src/media/UVideo.pas178
1 files changed, 139 insertions, 39 deletions
diff --git a/src/media/UVideo.pas b/src/media/UVideo.pas
index fd3c7e2a..0716bee2 100644
--- a/src/media/UVideo.pas
+++ b/src/media/UVideo.pas
@@ -81,6 +81,7 @@ uses
swscale,
{$ENDIF}
gl,
+ glu,
glext,
textgl,
UMediaCore_FFmpeg,
@@ -92,13 +93,23 @@ uses
UGraphic,
UPath;
+{$DEFINE PIXEL_FMT_BGR}
+
const
{$IFDEF PIXEL_FMT_BGR}
PIXEL_FMT_OPENGL = GL_BGR;
PIXEL_FMT_FFMPEG = PIX_FMT_BGR24;
+ PIXEL_FMT_SIZE = 3;
+
+ // looks strange on linux:
+ //PIXEL_FMT_OPENGL = GL_RGBA;
+ //PIXEL_FMT_FFMPEG = PIX_FMT_BGR32;
+ //PIXEL_FMT_SIZE = 4;
{$ELSE}
+ // looks strange on linux:
PIXEL_FMT_OPENGL = GL_RGB;
PIXEL_FMT_FFMPEG = PIX_FMT_RGB24;
+ PIXEL_FMT_SIZE = 3;
{$ENDIF}
type
@@ -142,9 +153,11 @@ type
fAspectCorrection: TAspectCorrection;
fTimeBase: extended; //**< FFmpeg time base per time unit
- fTime: extended; //**< video time position (absolute)
+ fFrameTime: extended; //**< video time position (absolute)
fLoopTime: extended; //**< start time of the current loop
+ fPboEnabled: boolean;
+ fPboId: GLuint;
procedure Reset();
function DecodeFrame(): boolean;
procedure SynchronizeTime(Frame: PAVFrame; var pts: double);
@@ -274,11 +287,14 @@ end;
function TVideo_FFmpeg.Open(const FileName : IPath): boolean;
var
errnum: Integer;
+ glErr: GLenum;
AudioStreamIndex: integer;
begin
Result := false;
Reset();
+ fPboEnabled := PboSupported;
+
// use custom 'ufile' protocol for UTF-8 support
errnum := av_open_input_file(fFormatContext, PAnsiChar('ufile:'+FileName.ToUTF8), nil, 0, nil);
if (errnum <> 0) then
@@ -425,14 +441,33 @@ begin
end;
{$ENDIF}
-
fTexWidth := Round(Power(2, Ceil(Log2(fCodecContext^.width))));
fTexHeight := Round(Power(2, Ceil(Log2(fCodecContext^.height))));
+ if (fPboEnabled) then
+ begin
+ glGetError();
+
+ glGenBuffersARB(1, @fPboId);
+ glBindBufferARB(GL_PIXEL_UNPACK_BUFFER_ARB, fPboId);
+ glBufferDataARB(
+ GL_PIXEL_UNPACK_BUFFER_ARB,
+ fCodecContext^.width * fCodecContext^.height * PIXEL_FMT_SIZE,
+ nil,
+ GL_STREAM_DRAW_ARB);
+ glBindBufferARB(GL_PIXEL_UNPACK_BUFFER_ARB, 0);
+
+ glErr := glGetError();
+ if (glErr <> GL_NO_ERROR) then
+ begin
+ fPboEnabled := false;
+ Log.LogError('PBO initialization failed: ' + gluErrorString(glErr), 'TVideo_FFmpeg.Open');
+ end;
+ end;
+
// 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);
@@ -447,10 +482,10 @@ begin
// close previously opened video
Close();
- fOpened := False;
- fPaused := False;
- fTimeBase := 0;
- fTime := 0;
+ fOpened := False;
+ fPaused := False;
+ fTimeBase := 0;
+ fFrameTime := 0;
fStream := nil;
fStreamIndex := -1;
fFrameTexValid := false;
@@ -460,6 +495,8 @@ begin
fLoop := false;
fLoopTime := 0;
+ fPboId := 0;
+
fAspectCorrection := acoCrop;
end;
@@ -493,6 +530,9 @@ begin
fCodecContext := nil;
fFormatContext := nil;
+ if (fPboId <> 0) then
+ glDeleteBuffersARB(1, @fPboId);
+
fOpened := False;
end;
@@ -503,22 +543,22 @@ begin
if (pts <> 0) then
begin
// if we have pts, set video clock to it
- fTime := pts;
+ fFrameTime := pts;
end else
begin
// if we aren't given a pts, set it to the clock
- pts := fTime;
+ pts := fFrameTime;
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;
+ fFrameTime := fFrameTime + 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
+ * The decoded frame is stored in fAVFrame. fFrameTime 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.
@@ -629,13 +669,15 @@ end;
procedure TVideo_FFmpeg.GetFrame(Time: Extended);
var
errnum: Integer;
- NewTime: Extended;
- TimeDifference: Extended;
+ glErr: GLenum;
+ CurrentTime: Extended;
+ TimeDiff: Extended;
DropFrameCount: Integer;
i: Integer;
Success: boolean;
+ BufferPtr: PGLvoid;
const
- FRAME_DROPCOUNT = 3;
+ SKIP_FRAME_DIFF = 0.010; // start skipping if we are >= 10ms too late
begin
if not fOpened then
Exit;
@@ -643,24 +685,37 @@ begin
if fPaused then
Exit;
+ {*
+ * TODO:
+ * Check if it is correct to assume that fTimeBase is the time of one frame?
+ * The tutorial and FFPlay do not make this assumption.
+ *}
+
+ {*
+ * Synchronization - begin
+ *}
+
// requested stream position (relative to the last loop's start)
- NewTime := Time - fLoopTime;
+ if (fLoop) then
+ CurrentTime := Time - fLoopTime
+ else
+ CurrentTime := Time;
// check if current texture still contains the active frame
if (fFrameTexValid) then
begin
// time since the last frame was returned
- TimeDifference := NewTime - fTime;
+ TimeDiff := CurrentTime - fFrameTime;
{$IFDEF DebugDisplay}
DebugWriteln('Time: '+inttostr(floor(Time*1000)) + sLineBreak +
- 'VideoTime: '+inttostr(floor(fTime*1000)) + sLineBreak +
+ 'VideoTime: '+inttostr(floor(fFrameTime*1000)) + sLineBreak +
'TimeBase: '+inttostr(floor(fTimeBase*1000)) + sLineBreak +
'TimeDiff: '+inttostr(floor(TimeDifference*1000)));
{$endif}
- // check if last time is more than one frame in the past
- if (TimeDifference < fTimeBase) then
+ // check if time has reached the next frame
+ if (TimeDiff < fTimeBase) then
begin
{$ifdef DebugFrames}
// frame delay debug display
@@ -670,7 +725,7 @@ begin
{$IFDEF DebugDisplay}
DebugWriteln('not getting new frame' + sLineBreak +
'Time: '+inttostr(floor(Time*1000)) + sLineBreak +
- 'VideoTime: '+inttostr(floor(fTime*1000)) + sLineBreak +
+ 'VideoTime: '+inttostr(floor(fFrameTime*1000)) + sLineBreak +
'TimeBase: '+inttostr(floor(fTimeBase*1000)) + sLineBreak +
'TimeDiff: '+inttostr(floor(TimeDifference*1000)));
{$endif}
@@ -684,12 +739,15 @@ begin
Log.BenchmarkStart(15);
{$ENDIF}
- // fetch new frame (updates fTime)
+ // fetch new frame (updates fFrameTime)
Success := DecodeFrame();
- TimeDifference := NewTime - fTime;
+ TimeDiff := CurrentTime - fFrameTime;
// check if we have to skip frames
- if (TimeDifference >= FRAME_DROPCOUNT*fTimeBase) then
+ // Either if we are one frame behind or if the skip threshold has been reached.
+ // Do not skip if the difference is less than fTimeBase as there is no next frame.
+ // Note: We assume that fTimeBase is the length of one frame.
+ if (TimeDiff >= Max(fTimeBase, SKIP_FRAME_DIFF)) then
begin
{$IFDEF DebugFrames}
//frame drop debug display
@@ -702,11 +760,11 @@ begin
{$endif}
// update video-time
- DropFrameCount := Trunc(TimeDifference / fTimeBase);
- fTime := fTime + DropFrameCount*fTimeBase;
+ DropFrameCount := Trunc(TimeDiff / fTimeBase);
+ fFrameTime := fFrameTime + 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
+ // skip frames
+ for i := 1 to DropFrameCount do
Success := DecodeFrame();
end;
@@ -718,12 +776,16 @@ 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.
+ // determine the position in the stream (fFrameTime-fLoopTime) later.
fLoopTime := Time;
end;
Exit;
end;
+ {*
+ * Synchronization - end
+ *}
+
// TODO: support for pan&scan
//if (fAVFrame.pan_scan <> nil) then
//begin
@@ -732,9 +794,9 @@ begin
// otherwise we convert the pixeldata from YUV to RGB
{$IFDEF UseSWScale}
- errnum := sws_scale(fSwScaleContext, @(fAVFrame.data), @(fAVFrame.linesize),
+ errnum := sws_scale(fSwScaleContext, @fAVFrame.data, @fAVFrame.linesize,
0, fCodecContext^.Height,
- @(fAVFrameRGB.data), @(fAVFrameRGB.linesize));
+ @fAVFrameRGB.data, @fAVFrameRGB.linesize);
{$ELSE}
// img_convert from lib/ffmpeg/avcodec.pas is actually deprecated.
// If ./configure does not find SWScale then this gives the error
@@ -762,10 +824,48 @@ begin
// 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]);
+ // TODO: check if this is faster
+ //glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE);
+
+ if (not fPboEnabled) then
+ begin
+ 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]);
+ end
+ else // fPboEnabled
+ begin
+ glGetError();
+
+ glBindBufferARB(GL_PIXEL_UNPACK_BUFFER_ARB, fPboId);
+ glBufferDataARB(GL_PIXEL_UNPACK_BUFFER_ARB,
+ fCodecContext^.height * fCodecContext^.width * PIXEL_FMT_SIZE,
+ nil,
+ GL_STREAM_DRAW_ARB);
+
+ bufferPtr := glMapBufferARB(GL_PIXEL_UNPACK_BUFFER_ARB, GL_WRITE_ONLY_ARB);
+ if(bufferPtr <> nil) then
+ begin
+ Move(fAVFrameRGB^.data[0]^, bufferPtr^,
+ fCodecContext^.height * fCodecContext^.width * PIXEL_FMT_SIZE);
+
+ // release pointer to mapping buffer
+ glUnmapBufferARB(GL_PIXEL_UNPACK_BUFFER_ARB);
+ end;
+
+ glBindTexture(GL_TEXTURE_2D, fFrameTex);
+ glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0,
+ fCodecContext^.width, fCodecContext^.height,
+ PIXEL_FMT_OPENGL, GL_UNSIGNED_BYTE, nil);
+
+ glBindBufferARB(GL_PIXEL_UNPACK_BUFFER_ARB, 0);
+ glBindTexture(GL_TEXTURE_2D, 0);
+
+ glErr := glGetError();
+ if (glErr <> GL_NO_ERROR) then
+ Log.LogError('PBO texture stream error: ' + gluErrorString(glErr), 'TVideo_FFmpeg.GetFrame');
+ end;
if (not fFrameTexValid) then
fFrameTexValid := true;
@@ -898,7 +998,7 @@ end;
procedure TVideo_FFmpeg.ShowDebugInfo();
begin
{$IFDEF Info}
- if (fTime+fTimeBase < 0) then
+ if (fFrameTime+fTimeBase < 0) then
begin
glColor4f(0.7, 1, 0.3, 1);
SetFontStyle (1);
@@ -959,8 +1059,8 @@ 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
+ * Note that fFrameTime is set to Time no matter if the actual position seeked to is
+ * at Time or the time of a preceding keyframe. fFrameTime will be updated to the
* actual frame time when GetFrame() is called the next time.
* @param Time new position in seconds
*}
@@ -986,7 +1086,7 @@ begin
// requested time, let the sync in GetFrame() do its job.
SeekFlags := AVSEEK_FLAG_BACKWARD;
- fTime := Time;
+ fFrameTime := Time;
fEOF := false;
fFrameTexValid := false;
@@ -1001,7 +1101,7 @@ end;
function TVideo_FFmpeg.GetPosition: real;
begin
- Result := fTime;
+ Result := fFrameTime;
end;
initialization
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-20 10:27:34 +0000