| Line | Branch | Exec | Source |
|---|---|---|---|
| 1 | /* | ||
| 2 | * H.263 parser | ||
| 3 | * Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at> | ||
| 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 | /** | ||
| 23 | * @file | ||
| 24 | * H.263 parser | ||
| 25 | */ | ||
| 26 | |||
| 27 | #include "parser.h" | ||
| 28 | |||
| 29 | ✗ | static int h263_find_frame_end(ParseContext *pc, const uint8_t *buf, int buf_size) | |
| 30 | { | ||
| 31 | int vop_found, i; | ||
| 32 | uint32_t state; | ||
| 33 | |||
| 34 | ✗ | vop_found= pc->frame_start_found; | |
| 35 | ✗ | state= pc->state; | |
| 36 | |||
| 37 | ✗ | i=0; | |
| 38 | ✗ | if(!vop_found){ | |
| 39 | ✗ | for(i=0; i<buf_size; i++){ | |
| 40 | ✗ | state= (state<<8) | buf[i]; | |
| 41 | ✗ | if(state>>(32-22) == 0x20){ | |
| 42 | ✗ | i++; | |
| 43 | ✗ | vop_found=1; | |
| 44 | ✗ | break; | |
| 45 | } | ||
| 46 | } | ||
| 47 | } | ||
| 48 | |||
| 49 | ✗ | if(vop_found){ | |
| 50 | ✗ | for(; i<buf_size; i++){ | |
| 51 | ✗ | state= (state<<8) | buf[i]; | |
| 52 | ✗ | if(state>>(32-22) == 0x20){ | |
| 53 | ✗ | pc->frame_start_found=0; | |
| 54 | ✗ | pc->state=-1; | |
| 55 | ✗ | return i-3; | |
| 56 | } | ||
| 57 | } | ||
| 58 | } | ||
| 59 | ✗ | pc->frame_start_found= vop_found; | |
| 60 | ✗ | pc->state= state; | |
| 61 | |||
| 62 | ✗ | return END_NOT_FOUND; | |
| 63 | } | ||
| 64 | |||
| 65 | 511 | static int h263_parse(AVCodecParserContext *s, | |
| 66 | AVCodecContext *avctx, | ||
| 67 | const uint8_t **poutbuf, int *poutbuf_size, | ||
| 68 | const uint8_t *buf, int buf_size) | ||
| 69 | { | ||
| 70 | 511 | ParseContext *pc = s->priv_data; | |
| 71 | int next; | ||
| 72 | |||
| 73 |
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511 | if (s->flags & PARSER_FLAG_COMPLETE_FRAMES) { |
| 74 | 511 | next = buf_size; | |
| 75 | } else { | ||
| 76 | ✗ | next = h263_find_frame_end(pc, buf, buf_size); | |
| 77 | |||
| 78 | ✗ | if (ff_combine_frame(pc, next, &buf, &buf_size) < 0) { | |
| 79 | ✗ | *poutbuf = NULL; | |
| 80 | ✗ | *poutbuf_size = 0; | |
| 81 | ✗ | return buf_size; | |
| 82 | } | ||
| 83 | } | ||
| 84 | |||
| 85 | 511 | *poutbuf = buf; | |
| 86 | 511 | *poutbuf_size = buf_size; | |
| 87 | 511 | return next; | |
| 88 | } | ||
| 89 | |||
| 90 | const AVCodecParser ff_h263_parser = { | ||
| 91 | .codec_ids = { AV_CODEC_ID_H263 }, | ||
| 92 | .priv_data_size = sizeof(ParseContext), | ||
| 93 | .parser_parse = h263_parse, | ||
| 94 | .parser_close = ff_parse_close, | ||
| 95 | }; | ||
| 96 |