blob: b4da58e345a345f7ed2d203db3baff49323cb778
| 1 | /* |
| 2 | * RAW Chinese AVS video demuxer |
| 3 | * Copyright (c) 2009 Stefan Gehrer <stefan.gehrer@gmx.de> |
| 4 | * |
| 5 | * This file is part of FFmpeg. |
| 6 | * |
| 7 | * FFmpeg is free software; you can redistribute it and/or |
| 8 | * modify it under the terms of the GNU Lesser General Public |
| 9 | * License as published by the Free Software Foundation; either |
| 10 | * version 2.1 of the License, or (at your option) any later version. |
| 11 | * |
| 12 | * FFmpeg is distributed in the hope that it will be useful, |
| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 15 | * Lesser General Public License for more details. |
| 16 | * |
| 17 | * You should have received a copy of the GNU Lesser General Public |
| 18 | * License along with FFmpeg; if not, write to the Free Software |
| 19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| 20 | */ |
| 21 | |
| 22 | #include "avformat.h" |
| 23 | #include "rawdec.h" |
| 24 | #include "libavcodec/internal.h" |
| 25 | |
| 26 | #define CAVS_SEQ_START_CODE 0x000001b0 |
| 27 | #define CAVS_PIC_I_START_CODE 0x000001b3 |
| 28 | #define CAVS_UNDEF_START_CODE 0x000001b4 |
| 29 | #define CAVS_PIC_PB_START_CODE 0x000001b6 |
| 30 | #define CAVS_VIDEO_EDIT_CODE 0x000001b7 |
| 31 | #define CAVS_PROFILE_JIZHUN 0x20 |
| 32 | |
| 33 | static int cavsvideo_probe(AVProbeData *p) |
| 34 | { |
| 35 | uint32_t code= -1; |
| 36 | int pic=0, seq=0, slice_pos = 0; |
| 37 | const uint8_t *ptr = p->buf, *end = p->buf + p->buf_size; |
| 38 | |
| 39 | while (ptr < end) { |
| 40 | ptr = avpriv_find_start_code(ptr, end, &code); |
| 41 | if ((code & 0xffffff00) == 0x100) { |
| 42 | if(code < CAVS_SEQ_START_CODE) { |
| 43 | /* slices have to be consecutive */ |
| 44 | if(code < slice_pos) |
| 45 | return 0; |
| 46 | slice_pos = code; |
| 47 | } else { |
| 48 | slice_pos = 0; |
| 49 | } |
| 50 | if (code == CAVS_SEQ_START_CODE) { |
| 51 | seq++; |
| 52 | /* check for the only currently supported profile */ |
| 53 | if (*ptr != CAVS_PROFILE_JIZHUN) |
| 54 | return 0; |
| 55 | } else if ((code == CAVS_PIC_I_START_CODE) || |
| 56 | (code == CAVS_PIC_PB_START_CODE)) { |
| 57 | pic++; |
| 58 | } else if ((code == CAVS_UNDEF_START_CODE) || |
| 59 | (code > CAVS_VIDEO_EDIT_CODE)) { |
| 60 | return 0; |
| 61 | } |
| 62 | } |
| 63 | } |
| 64 | if(seq && seq*9<=pic*10) |
| 65 | return AVPROBE_SCORE_EXTENSION+1; |
| 66 | return 0; |
| 67 | } |
| 68 | |
| 69 | FF_DEF_RAWVIDEO_DEMUXER(cavsvideo, "raw Chinese AVS (Audio Video Standard)", cavsvideo_probe, NULL, AV_CODEC_ID_CAVS) |
| 70 |