mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-12-02 03:06:28 +02:00
83 lines
2.6 KiB
C
83 lines
2.6 KiB
C
/*
|
|
* RAW H.264 video demuxer
|
|
* Copyright (c) 2008 Michael Niedermayer <michaelni@gmx.at>
|
|
*
|
|
* This file is part of FFmpeg.
|
|
*
|
|
* FFmpeg is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Lesser General Public
|
|
* License as published by the Free Software Foundation; either
|
|
* version 2.1 of the License, or (at your option) any later version.
|
|
*
|
|
* FFmpeg is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* Lesser General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public
|
|
* License along with FFmpeg; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
|
|
#include "avformat.h"
|
|
#include "rawdec.h"
|
|
#include "libavcodec/internal.h"
|
|
|
|
static int h264_probe(AVProbeData *p)
|
|
{
|
|
uint32_t code = -1;
|
|
int sps = 0, pps = 0, idr = 0, res = 0, sli = 0;
|
|
int i;
|
|
|
|
for (i = 0; i < p->buf_size; i++) {
|
|
code = (code << 8) + p->buf[i];
|
|
if ((code & 0xffffff00) == 0x100) {
|
|
int ref_idc = (code >> 5) & 3;
|
|
int type = code & 0x1F;
|
|
static const int8_t ref_zero[] = {
|
|
2, 0, 0, 0, 0, -1, 1, -1,
|
|
-1, 1, 1, 1, 1, -1, 2, 2,
|
|
2, 2, 2, 0, 2, 2, 2, 2,
|
|
2, 2, 2, 2, 2, 2, 2, 2
|
|
};
|
|
|
|
if (code & 0x80) // forbidden_bit
|
|
return 0;
|
|
|
|
if (ref_zero[type] == 1 && ref_idc)
|
|
return 0;
|
|
if (ref_zero[type] == -1 && !ref_idc)
|
|
return 0;
|
|
if (ref_zero[type] == 2) {
|
|
if (!(code == 0x100 && !p->buf[i + 1] && !p->buf[i + 2]))
|
|
res++;
|
|
}
|
|
|
|
switch (type) {
|
|
case 1:
|
|
sli++;
|
|
break;
|
|
case 5:
|
|
idr++;
|
|
break;
|
|
case 7:
|
|
if (p->buf[i + 2] & 0x03)
|
|
return 0;
|
|
sps++;
|
|
break;
|
|
case 8:
|
|
pps++;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
ff_tlog(NULL, "sps:%d pps:%d idr:%d sli:%d res:%d\n", sps, pps, idr, sli, res);
|
|
|
|
if (sps && pps && (idr || sli > 3) && res < (sps + pps + idr))
|
|
return AVPROBE_SCORE_EXTENSION + 1; // 1 more than .mpg
|
|
|
|
return 0;
|
|
}
|
|
|
|
FF_DEF_RAWVIDEO_DEMUXER(h264, "raw H.264 video", h264_probe, "h26l,h264,264,avc", AV_CODEC_ID_H264)
|