0,0 → 1,78 |
/* |
* 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" |
|
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) |
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; |
} |
} |
} |
|
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) |