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Detecting frames in case the Picture Start Code or Access Unit Delimiter extends over TS packet boundaries is now done by locally skipping TS packets in cFrameDetector

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Klaus Schmidinger 2011-09-04 13:09:06 +02:00
parent 96061c5b40
commit 699fd6d5d7
3 changed files with 34 additions and 5 deletions
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3
HISTORY
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@ -6739,3 +6739,6 @@ Video Disk Recorder Revision History
Richter).
- Fixed detecting frames on radio channels (reported by Chris Mayo).
- Revoked the changes to cFrameDetector that have been introduced in version 1.7.19.
Detecting frames in case the Picture Start Code or Access Unit Delimiter
extends over TS packet boundaries is now done by locally skipping TS packets
in cFrameDetector.

31
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 2.61 2011/09/04 10:13:14 kls Exp $
* $Id: remux.c 2.62 2011/09/04 13:09:06 kls Exp $
*/
#include "remux.h"
@ -818,6 +818,25 @@ void cFrameDetector::Reset(void)
scanner = EMPTY_SCANNER;
}
int cFrameDetector::SkipPackets(const uchar *&Data, int &Length, int &Processed, int &FrameTypeOffset)
{
if (!synced)
dbgframes("%d>", FrameTypeOffset);
while (Length >= TS_SIZE) {
// switch to the next TS packet, but skip those that have a different PID:
Data += TS_SIZE;
Length -= TS_SIZE;
Processed += TS_SIZE;
if (TsPid(Data) == pid)
break;
else if (Length < TS_SIZE)
esyslog("ERROR: out of data while skipping TS packets in cFrameDetector");
}
FrameTypeOffset -= TS_SIZE;
FrameTypeOffset += TsPayloadOffset(Data);
return FrameTypeOffset;
}
int cFrameDetector::Analyze(const uchar *Data, int Length)
{
int SeenPayloadStart = false;
@ -920,8 +939,11 @@ int cFrameDetector::Analyze(const uchar *Data, int Length)
scanner = EMPTY_SCANNER;
if (synced && !SeenPayloadStart && Processed)
return Processed; // flush everything before this new frame
int FrameTypeOffset = i + 2;
if (FrameTypeOffset >= TS_SIZE) // the byte to check is in the next TS packet
i = SkipPackets(Data, Length, Processed, FrameTypeOffset);
newFrame = true;
uchar FrameType = (Data[i + 2] >> 3) & 0x07;
uchar FrameType = (Data[FrameTypeOffset] >> 3) & 0x07;
independentFrame = FrameType == 1; // I-Frame
if (synced) {
if (framesPerPayloadUnit <= 1)
@ -944,8 +966,11 @@ int cFrameDetector::Analyze(const uchar *Data, int Length)
scanner = EMPTY_SCANNER;
if (synced && !SeenPayloadStart && Processed)
return Processed; // flush everything before this new frame
int FrameTypeOffset = i + 1;
if (FrameTypeOffset >= TS_SIZE) // the byte to check is in the next TS packet
i = SkipPackets(Data, Length, Processed, FrameTypeOffset);
newFrame = true;
uchar FrameType = Data[i + 1];
uchar FrameType = Data[FrameTypeOffset];
independentFrame = FrameType == 0x10;
if (synced) {
if (framesPerPayloadUnit < 0) {

5
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 2.31 2011/09/04 09:09:33 kls Exp $
* $Id: remux.h 2.32 2011/09/04 12:48:26 kls Exp $
*/
#ifndef __REMUX_H
@ -336,7 +336,7 @@ void PesDump(const char *Name, const u_char *Data, int Length);
// Frame detector:
#define MIN_TS_PACKETS_FOR_FRAME_DETECTOR 2
#define MIN_TS_PACKETS_FOR_FRAME_DETECTOR 5
class cFrameDetector {
private:
@ -359,6 +359,7 @@ private:
int payloadUnitOfFrame;
bool scanning;
uint32_t scanner;
int SkipPackets(const uchar *&Data, int &Length, int &Processed, int &FrameTypeOffset);
public:
cFrameDetector(int Pid = 0, int Type = 0);
///< Sets up a frame detector for the given Pid and stream Type.