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ffmpeg-cavs识别广电流

news 来源：原创 2024/9/21 16:19:14

如下如果想要ffmpeg识别广电的流，

/** RAW Chinese AVS video demuxer* Copyright (c) 2009  Stefan Gehrer <stefan.gehrer@gmx.de>** 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"#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
#define CAVS_PROFILE_GUANDIAN     0x48static int cavsvideo_probe(const AVProbeData *p)
{uint32_t code= -1;int pic=0, seq=0, slice_pos = 0;const uint8_t *ptr = p->buf, *end = p->buf + p->buf_size;while (ptr < end) {ptr = avpriv_find_start_code(ptr, end, &code);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 (*ptr != CAVS_PROFILE_JIZHUN && *ptr != CAVS_PROFILE_GUANDIAN)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_EXTENSION+1;return 0;
}FF_DEF_RAWVIDEO_DEMUXER(cavsvideo, "raw Chinese AVS (Audio Video Standard)", cavsvideo_probe, NULL, AV_CODEC_ID_CAVS)