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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 4349 | Serge | 1 | /* |
| 2 | * RAW Chinese AVS video demuxer |
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| 3 | * Copyright (c) 2009 Stefan Gehrer |
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| 4 | * |
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| 5 | * This file is part of FFmpeg. |
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| 6 | * |
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| 7 | * FFmpeg is free software; you can redistribute it and/or |
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| 8 | * modify it under the terms of the GNU Lesser General Public |
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| 9 | * License as published by the Free Software Foundation; either |
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| 10 | * version 2.1 of the License, or (at your option) any later version. |
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| 11 | * |
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| 12 | * FFmpeg is distributed in the hope that it will be useful, |
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| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 15 | * Lesser General Public License for more details. |
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| 16 | * |
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| 17 | * You should have received a copy of the GNU Lesser General Public |
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| 18 | * License along with FFmpeg; if not, write to the Free Software |
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| 19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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| 20 | */ |
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| 21 | |||
| 22 | #include "avformat.h" |
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| 23 | #include "rawdec.h" |
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| 24 | |||
| 25 | #define CAVS_SEQ_START_CODE 0x000001b0 |
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| 26 | #define CAVS_PIC_I_START_CODE 0x000001b3 |
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| 27 | #define CAVS_UNDEF_START_CODE 0x000001b4 |
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| 28 | #define CAVS_PIC_PB_START_CODE 0x000001b6 |
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| 29 | #define CAVS_VIDEO_EDIT_CODE 0x000001b7 |
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| 30 | #define CAVS_PROFILE_JIZHUN 0x20 |
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| 31 | |||
| 32 | static int cavsvideo_probe(AVProbeData *p) |
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| 33 | { |
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| 34 | uint32_t code= -1; |
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| 35 | int pic=0, seq=0, slice_pos = 0; |
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| 36 | int i; |
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| 37 | |||
| 38 | for(i=0; i |
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| 39 | code = (code<<8) + p->buf[i]; |
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| 40 | if ((code & 0xffffff00) == 0x100) { |
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| 41 | if(code < CAVS_SEQ_START_CODE) { |
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| 42 | /* slices have to be consecutive */ |
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| 43 | if(code < slice_pos) |
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| 44 | return 0; |
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| 45 | slice_pos = code; |
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| 46 | } else { |
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| 47 | slice_pos = 0; |
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| 48 | } |
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| 49 | if (code == CAVS_SEQ_START_CODE) { |
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| 50 | seq++; |
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| 51 | /* check for the only currently supported profile */ |
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| 52 | if(p->buf[i+1] != CAVS_PROFILE_JIZHUN) |
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| 53 | return 0; |
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| 54 | } else if ((code == CAVS_PIC_I_START_CODE) || |
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| 55 | (code == CAVS_PIC_PB_START_CODE)) { |
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| 56 | pic++; |
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| 57 | } else if ((code == CAVS_UNDEF_START_CODE) || |
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| 58 | (code > CAVS_VIDEO_EDIT_CODE)) { |
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| 59 | return 0; |
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| 60 | } |
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| 61 | } |
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| 62 | } |
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| 63 | if(seq && seq*9<=pic*10) |
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| 64 | return AVPROBE_SCORE_EXTENSION; |
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| 65 | return 0; |
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| 66 | } |
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| 67 | |||
| 68 | FF_DEF_RAWVIDEO_DEMUXER(cavsvideo, "raw Chinese AVS (Audio Video Standard)", cavsvideo_probe, NULL, AV_CODEC_ID_CAVS) |