| Line | Branch | Exec | Source |
|---|---|---|---|
| 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 "libavcodec/startcode.h" | ||
| 23 | #include "avformat.h" | ||
| 24 | #include "rawdec.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 // AVS1 P2 | ||
| 32 | #define CAVS_PROFILE_GUANGDIAN 0x48 // AVS1 P16/AVS+ | ||
| 33 | |||
| 34 | 7162 | static int cavsvideo_probe(const AVProbeData *p) | |
| 35 | { | ||
| 36 | 7162 | uint32_t code= -1; | |
| 37 | 7162 | int pic=0, seq=0, slice_pos = 0; | |
| 38 | 7162 | const uint8_t *ptr = p->buf, *end = p->buf + p->buf_size; | |
| 39 | |||
| 40 |
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26151 | while (ptr < end) { |
| 41 | 20894 | ptr = avpriv_find_start_code(ptr, end, &code); | |
| 42 |
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20894 | if ((code & 0xffffff00) == 0x100) { |
| 43 |
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15685 | if(code < CAVS_SEQ_START_CODE) { |
| 44 | /* slices have to be consecutive */ | ||
| 45 |
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14060 | if(code < slice_pos) |
| 46 | 981 | return 0; | |
| 47 | 13079 | slice_pos = code; | |
| 48 | } else { | ||
| 49 | 1625 | slice_pos = 0; | |
| 50 | } | ||
| 51 |
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14704 | if (code == CAVS_SEQ_START_CODE) { |
| 52 | 56 | seq++; | |
| 53 | /* check for the only currently supported profile */ | ||
| 54 |
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56 | if (*ptr != CAVS_PROFILE_JIZHUN && *ptr != CAVS_PROFILE_GUANGDIAN) |
| 55 | 55 | return 0; | |
| 56 |
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14648 | } else if ((code == CAVS_PIC_I_START_CODE) || |
| 57 |
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14388 | (code == CAVS_PIC_PB_START_CODE)) { |
| 58 | 290 | pic++; | |
| 59 |
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14358 | } else if ((code == CAVS_UNDEF_START_CODE) || |
| 60 |
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14351 | (code > CAVS_VIDEO_EDIT_CODE)) { |
| 61 | 869 | return 0; | |
| 62 | } | ||
| 63 | } | ||
| 64 | } | ||
| 65 |
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5257 | if(seq && seq*9<=pic*10) |
| 66 | 1 | return AVPROBE_SCORE_EXTENSION+1; | |
| 67 | 5256 | return 0; | |
| 68 | } | ||
| 69 | |||
| 70 | FF_DEF_RAWVIDEO_DEMUXER(cavsvideo, "raw Chinese AVS (Audio Video Standard)", cavsvideo_probe, "avs", AV_CODEC_ID_CAVS) | ||
| 71 |