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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 4349 | Serge | 1 | /* |
| 2 | * RAW H.264 video demuxer |
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| 3 | * Copyright (c) 2008 Michael Niedermayer |
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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 | static int h264_probe(AVProbeData *p) |
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| 26 | { |
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| 27 | uint32_t code = -1; |
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| 28 | int sps = 0, pps = 0, idr = 0, res = 0, sli = 0; |
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| 29 | int i; |
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| 30 | |||
| 31 | for (i = 0; i < p->buf_size; i++) { |
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| 32 | code = (code << 8) + p->buf[i]; |
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| 33 | if ((code & 0xffffff00) == 0x100) { |
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| 34 | int ref_idc = (code >> 5) & 3; |
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| 35 | int type = code & 0x1F; |
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| 36 | static const int8_t ref_zero[] = { |
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| 37 | 2, 0, 0, 0, 0, -1, 1, -1, |
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| 38 | -1, 1, 1, 1, 1, -1, 2, 2, |
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| 39 | 2, 2, 2, 0, 2, 2, 2, 2, |
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| 40 | 2, 2, 2, 2, 2, 2, 2, 2 |
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| 41 | }; |
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| 42 | |||
| 43 | if (code & 0x80) // forbidden_bit |
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| 44 | return 0; |
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| 45 | |||
| 46 | if (ref_zero[type] == 1 && ref_idc) |
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| 47 | return 0; |
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| 48 | if (ref_zero[type] == -1 && !ref_idc) |
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| 49 | return 0; |
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| 50 | if (ref_zero[type] == 2) |
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| 51 | res++; |
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| 52 | |||
| 53 | switch (type) { |
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| 54 | case 1: |
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| 55 | sli++; |
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| 56 | break; |
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| 57 | case 5: |
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| 58 | idr++; |
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| 59 | break; |
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| 60 | case 7: |
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| 61 | if (p->buf[i + 2] & 0x03) |
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| 62 | return 0; |
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| 63 | sps++; |
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| 64 | break; |
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| 65 | case 8: |
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| 66 | pps++; |
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| 67 | break; |
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| 68 | } |
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| 69 | } |
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| 70 | } |
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| 71 | |||
| 72 | if (sps && pps && (idr || sli > 3) && res < (sps + pps + idr)) |
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| 73 | return AVPROBE_SCORE_EXTENSION + 1; // 1 more than .mpg |
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| 74 | |||
| 75 | return 0; |
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| 76 | } |
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| 77 | |||
| 78 | FF_DEF_RAWVIDEO_DEMUXER(h264, "raw H.264 video", h264_probe, "h26l,h264,264,avc", AV_CODEC_ID_H264) |