Directory: | ../../../ffmpeg/ |
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File: | src/libavcodec/cavs_parser.c |
Date: | 2022-07-04 19:11:22 |
Exec | Total | Coverage | |
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Lines: | 35 | 36 | 97.2% |
Branches: | 18 | 22 | 81.8% |
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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 | 2755 | 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 | 2755 | pic_found= pc->frame_start_found; | |
42 | 2755 | state= pc->state; | |
43 | |||
44 | 2755 | i=0; | |
45 |
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2755 | if(!pic_found){ |
46 |
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2218 | for(i=0; i<buf_size; i++){ |
47 | 2218 | state= (state<<8) | buf[i]; | |
48 |
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2218 | if(state == PIC_I_START_CODE || state == PIC_PB_START_CODE){ |
49 | 450 | i++; | |
50 | 450 | pic_found=1; | |
51 | 450 | break; | |
52 | } | ||
53 | } | ||
54 | } | ||
55 | |||
56 |
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2755 | if(pic_found){ |
57 | /* EOF considered as end of frame */ | ||
58 |
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2755 | if (buf_size == 0) |
59 | 2 | return 0; | |
60 |
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4633398 | for(; i<buf_size; i++){ |
61 | 4631091 | state= (state<<8) | buf[i]; | |
62 |
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4631091 | if((state&0xFFFFFF00) == 0x100){ |
63 |
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446 | if(state > SLICE_MAX_START_CODE){ |
64 | 446 | pc->frame_start_found=0; | |
65 | 446 | pc->state=-1; | |
66 | 446 | return i-3; | |
67 | } | ||
68 | } | ||
69 | } | ||
70 | } | ||
71 | 2307 | pc->frame_start_found= pic_found; | |
72 | 2307 | pc->state= state; | |
73 | 2307 | return END_NOT_FOUND; | |
74 | } | ||
75 | |||
76 | 2755 | static int cavsvideo_parse(AVCodecParserContext *s, | |
77 | AVCodecContext *avctx, | ||
78 | const uint8_t **poutbuf, int *poutbuf_size, | ||
79 | const uint8_t *buf, int buf_size) | ||
80 | { | ||
81 | 2755 | ParseContext *pc = s->priv_data; | |
82 | int next; | ||
83 | |||
84 |
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2755 | if(s->flags & PARSER_FLAG_COMPLETE_FRAMES){ |
85 | ✗ | next= buf_size; | |
86 | }else{ | ||
87 | 2755 | next= cavs_find_frame_end(pc, buf, buf_size); | |
88 | |||
89 |
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2755 | if (ff_combine_frame(pc, next, &buf, &buf_size) < 0) { |
90 | 2307 | *poutbuf = NULL; | |
91 | 2307 | *poutbuf_size = 0; | |
92 | 2307 | return buf_size; | |
93 | } | ||
94 | } | ||
95 | 448 | *poutbuf = buf; | |
96 | 448 | *poutbuf_size = buf_size; | |
97 | 448 | return next; | |
98 | } | ||
99 | |||
100 | const AVCodecParser ff_cavsvideo_parser = { | ||
101 | .codec_ids = { AV_CODEC_ID_CAVS }, | ||
102 | .priv_data_size = sizeof(ParseContext), | ||
103 | .parser_parse = cavsvideo_parse, | ||
104 | .parser_close = ff_parse_close, | ||
105 | }; | ||
106 |