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Code Issues Releases Wiki Activity

Simplified calculating the PTS offset in cPtsFixer::Fix() and fixed the overflow handling of PCR values

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This commit is contained in:
Klaus Schmidinger 2012-12-02 14:33:06 +01:00
parent a23a13873f
commit 441bf30032
3 changed files with 8 additions and 10 deletions
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2
CONTRIBUTORS
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@ -2978,6 +2978,8 @@ S
packets that have a payload
for pointing out that when adjusting the DTS values in the cutter, it hase to compensate
for dropped B-frames
for simplifying calculating the PTS offset in cPtsFixer::Fix() and fixing the overflow
handling of PCR values
Peter Münster <pmlists@free.fr>
for fixing 'make install' to not overwrite existing configuration files

2
HISTORY
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@ -7356,3 +7356,5 @@ Video Disk Recorder Revision History
- Fixed adjusting the DTS values in the cutter, to compensate for dropped B-frames
(pointed out by Sören Moch).
- Fixed a typo in skins.h (thanks to Lars Hanisch).
- Simplified calculating the PTS offset in cPtsFixer::Fix() and fixed the overflow
handling of PCR values (thanks to Sören Moch).

14
cutter.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: cutter.c 2.20 2012/11/29 15:30:01 kls Exp $
* $Id: cutter.c 2.21 2012/12/02 14:30:55 kls Exp $
*/
#include "cutter.h"
@ -192,14 +192,8 @@ void cPtsFixer::Fix(uchar *Data, int Length, bool CutIn)
// Determine the PTS offset at the beginning of each sequence (except the first one):
if (CutIn && lastPts >= 0) {
int64_t Pts = TsGetPts(Data, Length);
if (Pts >= 0) {
// offset is calculated so that Pts + offset results in lastPts + delta:
offset = Pts - PtsAdd(lastPts, delta);
if (offset <= 0)
offset = -offset;
else
offset = MAX33BIT + 1 - offset;
}
if (Pts >= 0)
offset = (lastPts + delta - Pts) & MAX33BIT; // offset is calculated so that Pts + offset results in lastPts + delta
fixCounters = true;
}
// Keep track of the highest video PTS:
@ -262,7 +256,7 @@ void cPtsFixer::Fix(uchar *Data, int Length, bool CutIn)
int64_t Pcr = TsGetPcr(p);
if (Pcr >= 0) {
int64_t NewPcr = Pcr + offset * PCRFACTOR;
if (NewPcr >= MAX27MHZ)
if (NewPcr > MAX27MHZ)
NewPcr -= MAX27MHZ + 1;
TsSetPcr(p, NewPcr);
}