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lavf: add raw AVS2 demuxer

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Signed-off-by: hwren <hwrenx@126.com>
Signed-off-by: Steven Liu <lq@chinaffmpeg.org>
This commit is contained in:
Steven Liu 2018-09-12 11:21:59 +08:00
parent 4356e03fd6
commit 1e20ed4382
3 changed files with 73 additions and 0 deletions
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1
libavformat/Makefile
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@ -115,6 +115,7 @@ OBJS-$(CONFIG_AVI_MUXER) += avienc.o mpegtsenc.o avlanguage.o ra
OBJS-$(CONFIG_AVM2_MUXER) += swfenc.o swf.o
OBJS-$(CONFIG_AVR_DEMUXER) += avr.o pcm.o
OBJS-$(CONFIG_AVS_DEMUXER) += avs.o voc_packet.o vocdec.o voc.o
OBJS-$(CONFIG_AVS2_DEMUXER) += davs2.o rawdec.o
OBJS-$(CONFIG_AVS2_MUXER) += rawenc.o
OBJS-$(CONFIG_BETHSOFTVID_DEMUXER) += bethsoftvid.o
OBJS-$(CONFIG_BFI_DEMUXER) += bfi.o

1
libavformat/allformats.c
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@ -76,6 +76,7 @@ extern AVInputFormat ff_avisynth_demuxer;
extern AVOutputFormat ff_avm2_muxer;
extern AVInputFormat ff_avr_demuxer;
extern AVInputFormat ff_avs_demuxer;
extern AVInputFormat ff_avs2_demuxer;
extern AVOutputFormat ff_avs2_muxer;
extern AVInputFormat ff_bethsoftvid_demuxer;
extern AVInputFormat ff_bfi_demuxer;

71
libavformat/davs2.c Normal file
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@ -0,0 +1,71 @@
/*
* AVS2 video stream probe.
*
* Copyright (C) 2018 Huiwen Ren, <hwrenx@126.com>
*
* 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"
#include "libavutil/intreadwrite.h"
#define ISSQH(x) ((x) == 0xB0 )
#define ISEND(x) ((x) == 0xB1 )
#define ISPIC(x) ((x) == 0xB3 || (x) == 0xB6)
#define ISUNIT(x) ( ISSQH(x) || ISEND(x) || (x) == 0xB2 || ISPIC(x) || (x) == 0xB5 || (x) == 0xB7 )
#define ISAVS2(x) ((x) == 0x20 || (x) == 0x22 || (x) == 0x30 || (x) == 0x32 )
static int avs2_probe(AVProbeData *p)
{
if (AV_RB32(p->buf) != 0x1B0){
return 0;
}
uint32_t code= -1, hds=0, pic=0, seq=0;
uint8_t state=0;
const uint8_t *ptr = p->buf, *end = p->buf + p->buf_size, *sqb=0;
while (ptr < end) {
ptr = avpriv_find_start_code(ptr, end, &code);
state = code & 0xFF;
if ((code & 0xffffff00) == 0x100) {
if (ISUNIT(state)) {
if (sqb && !hds) {
hds = ptr - sqb;
}
if (ISSQH(state)) {
if (!ISAVS2(*ptr))
return 0;
sqb = ptr;
seq++;
} else if (ISPIC(state)) {
pic++;
} else if (ISEND(state)) {
break;
}
}
}
}
if (seq && hds >= 21 && pic){
return AVPROBE_SCORE_EXTENSION + 2; // more than cavs
}
return 0;
}
FF_DEF_RAWVIDEO_DEMUXER(avs2, "raw AVS2-P2/IEEE1857.4", avs2_probe, "avs,avs2", AV_CODEC_ID_AVS2)