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Code Issues Releases Wiki Activity

Fixed detecting frames on channels that broadcast with 50 or 60 fps

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This commit is contained in:
Klaus Schmidinger 2010-11-01 12:31:52 +01:00
parent 55d0d8f9ba
commit 4f50c34824
3 changed files with 26 additions and 38 deletions
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7
HISTORY
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@ -6481,7 +6481,7 @@ Video Disk Recorder Revision History
from Osama Alrawab). See INSTALL for information on how to turn this on.
- Added Arabian language texts (thanks to Osama Alrawab).
2010-10-30: Version 1.7.17
2010-11-01: Version 1.7.17
- Updated the Estonian OSD texts (thanks to Arthur Konovalov).
- Fixed following symbolic links in RemoveFileOrDir() (cont'd) (thanks to
@ -6495,3 +6495,8 @@ Video Disk Recorder Revision History
- Made 'dist' target dependent on up to date *.po (thanks to Ville Skyttä).
- Added Language and fixed Language-Team header of *.po (thanks to Ville Skyttä).
- Updated the Lithuanian OSD texts (thanks to Valdemaras Pipiras).
- Fixed detecting frames on channels that broadcast with 50 or 60 fps.
This avoids artifacts during fast forward/rewind when replaying recordings from such
channels. To fix the index of existing recordings from such channels, just delete the
'index' file of the recording and VDR will generate a new one the next time you play it.
You should also change the line "F 25" to "F 50" in the 'info' file of that recording.

47
remux.c
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@ -4,7 +4,7 @@
* See the main source file 'vdr.c' for copyright information and
* how to reach the author.
*
* $Id: remux.c 2.47 2010/06/05 13:32:15 kls Exp $
* $Id: remux.c 2.48 2010/11/01 12:29:17 kls Exp $
*/
#include "remux.h"
@ -780,9 +780,8 @@ cFrameDetector::cFrameDetector(int Pid, int Type)
newFrame = independentFrame = false;
numPtsValues = 0;
numIFrames = 0;
frameDuration = 0;
framesPerSecond = 0;
framesInPayloadUnit = framesPerPayloadUnit = 0;
payloadUnitOfFrame = 0;
scanning = false;
scanner = EMPTY_SCANNER;
}
@ -804,7 +803,6 @@ void cFrameDetector::SetPid(int Pid, int Type)
void cFrameDetector::Reset(void)
{
newFrame = independentFrame = false;
payloadUnitOfFrame = 0;
scanning = false;
scanner = EMPTY_SCANNER;
}
@ -831,8 +829,8 @@ int cFrameDetector::Analyze(const uchar *Data, int Length)
return Processed;
if (Length < MIN_TS_PACKETS_FOR_FRAME_DETECTOR * TS_SIZE)
return Processed; // need more data, in case the frame type is not stored in the first TS packet
if (!frameDuration) {
// frame duration unknown, so collect a sequence of PTS values:
if (!framesPerSecond) {
// frame rate unknown, so collect a sequence of PTS values:
if (numPtsValues < MaxPtsValues && numIFrames < 2) { // collect a sequence containing at least two I-frames
const uchar *Pes = Data + TsPayloadOffset(Data);
if (PesHasPts(Pes)) {
@ -857,28 +855,22 @@ int cFrameDetector::Analyze(const uchar *Data, int Length)
uint32_t Delta = ptsValues[0];
// determine frame info:
if (isVideo) {
if (Delta % 3600 == 0)
frameDuration = 3600; // PAL, 25 fps, exact timing
else if (abs(Delta % 3600) == 3599 || abs(Delta % 3600) == 1)
frameDuration = 3600; // PAL, 25 fps, timing with jitter
if (abs(Delta - 3600) <= 1)
framesPerSecond = 25.0;
else if (Delta % 3003 == 0)
frameDuration = 3003; // NTSC, 29.97 fps
else if (abs(Delta - 1800) <= 1) {
frameDuration = 3600; // PAL, 25 fps
framesPerPayloadUnit = -2;
}
else if (Delta == 1501) {
frameDuration = 3003; // NTSC, 29.97 fps
framesPerPayloadUnit = -2;
}
framesPerSecond = 30.0 / 1.001;
else if (abs(Delta - 1800) <= 1)
framesPerSecond = 50.0;
else if (Delta == 1501)
framesPerSecond = 60.0 / 1.001;
else {
frameDuration = 3600; // unknown, assuming 25 fps
dsyslog("unknown frame duration (%d), assuming 25 fps", Delta);
framesPerSecond = 25.0;
dsyslog("unknown frame delta (%d), assuming 25 fps", Delta);
}
}
else // audio
frameDuration = Delta; // PTS of audio frames is always increasing
dbgframes("\nframe duration = %d FPS = %5.2f FPPU = %d\n", frameDuration, 90000.0 / frameDuration, framesPerPayloadUnit);
framesPerSecond = 90000.0 / Delta; // PTS of audio frames is always increasing
dbgframes("\nDelta = %d FPS = %5.2f FPPU = %d\n", Delta, framesPerSecond, framesPerPayloadUnit);
}
}
scanner = EMPTY_SCANNER;
@ -927,13 +919,6 @@ int cFrameDetector::Analyze(const uchar *Data, int Length)
newFrame = true;
independentFrame = Data[i + 1] == 0x10;
if (synced) {
if (framesPerPayloadUnit < 0) {
payloadUnitOfFrame = (payloadUnitOfFrame + 1) % -framesPerPayloadUnit;
if (payloadUnitOfFrame != 0 && independentFrame)
payloadUnitOfFrame = 0;
if (payloadUnitOfFrame)
newFrame = false;
}
if (framesPerPayloadUnit <= 1)
scanning = false;
}
@ -964,7 +949,7 @@ int cFrameDetector::Analyze(const uchar *Data, int Length)
pid = 0; // let's just ignore any further data
}
}
if (!synced && frameDuration && independentFrame) {
if (!synced && framesPerSecond && independentFrame) {
synced = true;
dbgframes("*");
Reset();

10
remux.h
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@ -4,7 +4,7 @@
* See the main source file 'vdr.c' for copyright information and
* how to reach the author.
*
* $Id: remux.h 2.26 2010/06/05 13:27:55 kls Exp $
* $Id: remux.h 2.27 2010/11/01 11:24:20 kls Exp $
*/
#ifndef __REMUX_H
@ -347,12 +347,10 @@ private:
int numPtsValues;
int numIFrames;
bool isVideo;
int frameDuration;
double framesPerSecond;
int framesInPayloadUnit;
int framesPerPayloadUnit; // Some broadcasters send one frame per payload unit (== 1),
// some put an entire GOP into one payload unit (> 1), and
// some spread a single frame over several payload units (< 0).
int payloadUnitOfFrame;
// while others put an entire GOP into one payload unit (> 1).
bool scanning;
uint32_t scanner;
public:
@ -380,7 +378,7 @@ public:
///< Returns true if a new frame was detected and this is an independent frame
///< (i.e. one that can be displayed by itself, without using data from any
///< other frames).
double FramesPerSecond(void) { return frameDuration ? 90000.0 / frameDuration : 0; }
double FramesPerSecond(void) { return framesPerSecond; }
///< Returns the number of frames per second, or 0 if this information is not
///< available.
};