| /* |
| * 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 |
| |
| static int cavsvideo_probe(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) |
| 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) |
