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add raw demuxer for Chinese AVS elementary streams

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Originally committed as revision 17473 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Stefan Gehrer 2009-02-21 10:34:29 +00:00
parent a169df2f76
commit 9f2fc1268c
3 changed files with 58 additions and 0 deletions
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1
libavformat/Makefile
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@ -33,6 +33,7 @@ OBJS-$(CONFIG_AVS_DEMUXER) += avs.o vocdec.o voc.o
OBJS-$(CONFIG_BETHSOFTVID_DEMUXER) += bethsoftvid.o
OBJS-$(CONFIG_BFI_DEMUXER) += bfi.o
OBJS-$(CONFIG_C93_DEMUXER) += c93.o vocdec.o voc.o
OBJS-$(CONFIG_CAVSVIDEO_DEMUXER) += raw.o
OBJS-$(CONFIG_CRC_MUXER) += crcenc.o
OBJS-$(CONFIG_DAUD_DEMUXER) += daud.o
OBJS-$(CONFIG_DAUD_MUXER) += daud.o

1
libavformat/allformats.c
View File

@ -65,6 +65,7 @@ void av_register_all(void)
REGISTER_DEMUXER (BETHSOFTVID, bethsoftvid);
REGISTER_DEMUXER (BFI, bfi);
REGISTER_DEMUXER (C93, c93);
REGISTER_DEMUXER (CAVSVIDEO, cavsvideo);
REGISTER_MUXER (CRC, crc);
REGISTER_MUXDEMUX (DAUD, daud);
REGISTER_MUXDEMUX (DIRAC, dirac);

56
libavformat/raw.c
View File

@ -365,6 +365,49 @@ static int mpegvideo_probe(AVProbeData *p)
return AVPROBE_SCORE_MAX/2+1; // +1 for .mpg
return 0;
}
#define CAVS_SEQ_START_CODE 0x000001b0
#define CAVS_PIC_I_START_CODE 0x000001b3
#define CAVS_UNDEF_START_CODE 0x000001b4
#define CAVS_PIC_PB_START_CODE 0x000001b6
#define CAVS_VIDEO_EDIT_CODE 0x000001b7
#define CAVS_PROFILE_JIZHUN 0x20
static int cavsvideo_probe(AVProbeData *p)
{
uint32_t code= -1;
int pic=0, seq=0, slice_pos = 0;
int i;
for(i=0; i<p->buf_size; i++){
code = (code<<8) + p->buf[i];
if ((code & 0xffffff00) == 0x100) {
if(code < CAVS_SEQ_START_CODE) {
/* slices have to be consecutive */
if(code < slice_pos)
return 0;
slice_pos = code;
} else {
slice_pos = 0;
}
if (code == CAVS_SEQ_START_CODE) {
seq++;
/* check for the only currently supported profile */
if(p->buf[i+1] != CAVS_PROFILE_JIZHUN)
return 0;
} else if ((code == CAVS_PIC_I_START_CODE) ||
(code == CAVS_PIC_PB_START_CODE)) {
pic++;
} else if ((code == CAVS_UNDEF_START_CODE) ||
(code > CAVS_VIDEO_EDIT_CODE)) {
return 0;
}
}
}
if(seq && seq*9<=pic*10)
return AVPROBE_SCORE_MAX/2;
return 0;
}
#endif
#if CONFIG_M4V_DEMUXER
@ -1054,6 +1097,19 @@ AVInputFormat mpegvideo_demuxer = {
};
#endif
#if CONFIG_CAVSVIDEO_DEMUXER
AVInputFormat cavsvideo_demuxer = {
"cavsvideo",
NULL_IF_CONFIG_SMALL("Chinese AVS video"),
0,
cavsvideo_probe,
video_read_header,
raw_read_partial_packet,
.flags= AVFMT_GENERIC_INDEX,
.value = CODEC_ID_CAVS,
};
#endif
#if CONFIG_NULL_MUXER
AVOutputFormat null_muxer = {
"null",