diff options
Diffstat (limited to 'remux.c')
| -rw-r--r-- | remux.c | 44 |
1 files changed, 35 insertions, 9 deletions
@@ -11,7 +11,7 @@ * The cRepacker family's code was originally written by Reinhard Nissl <rnissl@gmx.de>, * and adapted to the VDR coding style by Klaus.Schmidinger@cadsoft.de. * - * $Id: remux.c 1.54 2006/02/03 16:19:02 kls Exp $ + * $Id: remux.c 1.55 2006/03/25 12:27:30 kls Exp $ */ #include "remux.h" @@ -1429,7 +1429,9 @@ int cDolbyRepacker::BreakAt(const uchar *Data, int Count) #define IPACKS 2048 // Start codes: -#define SC_PICTURE 0x00 // "picture header" +#define SC_SEQUENCE 0xB3 // "sequence header code" +#define SC_GROUP 0xB8 // "group start code" +#define SC_PICTURE 0x00 // "picture start code" #define MAXNONUSEFULDATA (10*1024*1024) #define MAXNUMUPTERRORS 10 @@ -1925,14 +1927,38 @@ int cRemux::ScanVideoPacket(const uchar *Data, int Count, int Offset, uchar &Pic if (Length > 0) { int PesPayloadOffset = 0; if (AnalyzePesHeader(Data + Offset, Length, PesPayloadOffset) >= phMPEG1) { - for (int i = Offset + PesPayloadOffset; i < Offset + Length - 5; i++) { - if (Data[i] == 0 && Data[i + 1] == 0 && Data[i + 2] == 1) { - switch (Data[i + 3]) { - case SC_PICTURE: PictureType = (Data[i + 5] >> 3) & 0x07; - return Length; + const uchar *p = Data + Offset + PesPayloadOffset + 2; + const uchar *pLimit = Data + Offset + Length - 3; +#ifdef TEST_cVideoRepacker + // cVideoRepacker ensures that a new PES packet is started for a new sequence, + // group or picture which allows us to easily skip scanning through a huge + // amount of video data. + if (p < pLimit) { + if (p[-2] || p[-1] || p[0] != 0x01) + pLimit = 0; // skip scanning: packet doesn't start with 0x000001 + else { + switch (p[1]) { + case SC_SEQUENCE: + case SC_GROUP: + case SC_PICTURE: + break; + default: // skip scanning: packet doesn't start a new sequence, group or picture + pLimit = 0; + } + } + } +#endif + while (p < pLimit && (p = (const uchar *)memchr(p, 0x01, pLimit - p))) { + if (!p[-2] && !p[-1]) { // found 0x000001 + switch (p[1]) { + case SC_PICTURE: PictureType = (p[3] >> 3) & 0x07; + return Length; + } + p += 4; // continue scanning after 0x01ssxxyy } - } - } + else + p += 3; // continue scanning after 0x01xxyy + } } PictureType = NO_PICTURE; return Length; |