| Line | Branch | Exec | Source |
|---|---|---|---|
| 1 | /* | ||
| 2 | * RAW MPEG-4 video demuxer | ||
| 3 | * Copyright (c) 2006 Thijs Vermeir <thijs.vermeir@barco.com> | ||
| 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 | |||
| 25 | #define VOS_STARTCODE 0x1B0 | ||
| 26 | #define USER_DATA_STARTCODE 0x1B2 | ||
| 27 | #define GOP_STARTCODE 0x1B3 | ||
| 28 | #define VISUAL_OBJ_STARTCODE 0x1B5 | ||
| 29 | #define VOP_STARTCODE 0x1B6 | ||
| 30 | #define SLICE_STARTCODE 0x1B7 | ||
| 31 | #define EXT_STARTCODE 0x1B8 | ||
| 32 | |||
| 33 | 8151 | static int mpeg4video_probe(const AVProbeData *probe_packet) | |
| 34 | { | ||
| 35 | 8151 | uint32_t temp_buffer = -1; | |
| 36 | 8151 | int VO = 0, VOL = 0, VOP = 0, VISO = 0, res = 0; | |
| 37 | 8151 | int res_main = 0; | |
| 38 | int i; | ||
| 39 | |||
| 40 |
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515085954 | for (i = 0; i < probe_packet->buf_size; i++) { |
| 41 | 515077803 | temp_buffer = (temp_buffer << 8) + probe_packet->buf[i]; | |
| 42 |
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515077803 | if (temp_buffer & 0xfffffe00) |
| 43 | 506399067 | continue; | |
| 44 |
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8678736 | if (temp_buffer < 2) |
| 45 | 8124792 | continue; | |
| 46 | |||
| 47 |
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553944 | if (temp_buffer == VOP_STARTCODE) |
| 48 | 265 | VOP++; | |
| 49 |
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553679 | else if (temp_buffer == VISUAL_OBJ_STARTCODE) |
| 50 | 944 | VISO++; | |
| 51 |
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552735 | else if (temp_buffer >= 0x100 && temp_buffer < 0x120) |
| 52 | 36077 | VO++; | |
| 53 |
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516658 | else if (temp_buffer >= 0x120 && temp_buffer < 0x130) |
| 54 | 1552 | VOL++; | |
| 55 |
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515106 | else if (temp_buffer == SLICE_STARTCODE || temp_buffer == EXT_STARTCODE) |
| 56 | 401 | res_main++; | |
| 57 |
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514705 | else if (!(0x1AF < temp_buffer && temp_buffer < 0x1B7) && |
| 58 |
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6578 | !(0x1B9 < temp_buffer && temp_buffer < 0x1C4)) |
| 59 | 513262 | res++; | |
| 60 | } | ||
| 61 | |||
| 62 | // res_main represents the reserved codes within the "main" profile, they are | ||
| 63 | // added to the reserved ones if it appears that this is a "main" profile | ||
| 64 | // stream | ||
| 65 |
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8151 | if (res_main && 2*res_main < VOP) |
| 66 | ✗ | res += res_main; | |
| 67 | |||
| 68 |
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8151 | if (VOP >= VISO && VOP >= VOL && VO >= VOL && VOL > 0 && res == 0) |
| 69 |
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57 | return VOP+VO > 4 ? AVPROBE_SCORE_EXTENSION : AVPROBE_SCORE_EXTENSION/2; |
| 70 | |||
| 71 |
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8094 | if (VOP >= VISO && VOP >= VOL && VO >= VOL && VOL > 0 && VOP+VO > 4) |
| 72 | 7 | return AVPROBE_SCORE_EXTENSION/10; | |
| 73 | 8087 | return 0; | |
| 74 | } | ||
| 75 | |||
| 76 | FF_DEF_RAWVIDEO_DEMUXER2(m4v, "raw MPEG-4 video", mpeg4video_probe, "m4v", | ||
| 77 | AV_CODEC_ID_MPEG4, AVFMT_GENERIC_INDEX | AVFMT_TS_DISCONT) | ||
| 78 |