| Line | Branch | Exec | Source |
|---|---|---|---|
| 1 | /* | ||
| 2 | * Chinese AVS video (AVS1-P2, JiZhun profile) parser. | ||
| 3 | * Copyright (c) 2006 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 | /** | ||
| 23 | * @file | ||
| 24 | * Chinese AVS video (AVS1-P2, JiZhun profile) parser | ||
| 25 | * @author Stefan Gehrer <stefan.gehrer@gmx.de> | ||
| 26 | */ | ||
| 27 | |||
| 28 | #include "parser.h" | ||
| 29 | #include "cavs.h" | ||
| 30 | |||
| 31 | |||
| 32 | /** | ||
| 33 | * Find the end of the current frame in the bitstream. | ||
| 34 | * @return the position of the first byte of the next frame, or -1 | ||
| 35 | */ | ||
| 36 | 2992 | static int cavs_find_frame_end(ParseContext *pc, const uint8_t *buf, | |
| 37 | int buf_size) { | ||
| 38 | int pic_found, i; | ||
| 39 | uint32_t state; | ||
| 40 | |||
| 41 | 2992 | pic_found= pc->frame_start_found; | |
| 42 | 2992 | state= pc->state; | |
| 43 | |||
| 44 | 2992 | i=0; | |
| 45 |
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2992 | if(!pic_found){ |
| 46 |
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2498 | for(i=0; i<buf_size; i++){ |
| 47 | 2498 | state= (state<<8) | buf[i]; | |
| 48 |
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2498 | if(state == PIC_I_START_CODE || state == PIC_PB_START_CODE){ |
| 49 | 511 | i++; | |
| 50 | 511 | pic_found=1; | |
| 51 | 511 | break; | |
| 52 | } | ||
| 53 | } | ||
| 54 | } | ||
| 55 | |||
| 56 |
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2992 | if(pic_found){ |
| 57 | /* EOF considered as end of frame */ | ||
| 58 |
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2992 | if (buf_size == 0) |
| 59 | 4 | return 0; | |
| 60 |
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4813297 | for(; i<buf_size; i++){ |
| 61 | 4810815 | state= (state<<8) | buf[i]; | |
| 62 |
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4810815 | if (state == PIC_I_START_CODE || state == PIC_PB_START_CODE || |
| 63 | state == CAVS_START_CODE) { | ||
| 64 | 506 | pc->frame_start_found=0; | |
| 65 | 506 | pc->state=-1; | |
| 66 | 506 | return i-3; | |
| 67 | } | ||
| 68 | } | ||
| 69 | } | ||
| 70 | 2482 | pc->frame_start_found= pic_found; | |
| 71 | 2482 | pc->state= state; | |
| 72 | 2482 | return END_NOT_FOUND; | |
| 73 | } | ||
| 74 | |||
| 75 | 2992 | static int cavsvideo_parse(AVCodecParserContext *s, | |
| 76 | AVCodecContext *avctx, | ||
| 77 | const uint8_t **poutbuf, int *poutbuf_size, | ||
| 78 | const uint8_t *buf, int buf_size) | ||
| 79 | { | ||
| 80 | 2992 | ParseContext *pc = s->priv_data; | |
| 81 | int next; | ||
| 82 | |||
| 83 |
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2992 | if(s->flags & PARSER_FLAG_COMPLETE_FRAMES){ |
| 84 | ✗ | next= buf_size; | |
| 85 | }else{ | ||
| 86 | 2992 | next= cavs_find_frame_end(pc, buf, buf_size); | |
| 87 | |||
| 88 |
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2992 | if (ff_combine_frame(pc, next, &buf, &buf_size) < 0) { |
| 89 | 2482 | *poutbuf = NULL; | |
| 90 | 2482 | *poutbuf_size = 0; | |
| 91 | 2482 | return buf_size; | |
| 92 | } | ||
| 93 | } | ||
| 94 | 510 | *poutbuf = buf; | |
| 95 | 510 | *poutbuf_size = buf_size; | |
| 96 | 510 | return next; | |
| 97 | } | ||
| 98 | |||
| 99 | const AVCodecParser ff_cavsvideo_parser = { | ||
| 100 | .codec_ids = { AV_CODEC_ID_CAVS }, | ||
| 101 | .priv_data_size = sizeof(ParseContext), | ||
| 102 | .parser_parse = cavsvideo_parse, | ||
| 103 | .parser_close = ff_parse_close, | ||
| 104 | }; | ||
| 105 |