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2ba45a60 DM |
1 | /* |
2 | * TAK parser | |
3 | * Copyright (c) 2012 Michael Niedermayer | |
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 | * TAK parser | |
25 | **/ | |
26 | ||
27 | #include "tak.h" | |
28 | #include "parser.h" | |
29 | ||
30 | typedef struct TAKParseContext { | |
31 | ParseContext pc; | |
32 | TAKStreamInfo ti; | |
33 | int index; | |
34 | } TAKParseContext; | |
35 | ||
36 | static int tak_parse(AVCodecParserContext *s, AVCodecContext *avctx, | |
37 | const uint8_t **poutbuf, int *poutbuf_size, | |
38 | const uint8_t *buf, int buf_size) | |
39 | { | |
40 | TAKParseContext *t = s->priv_data; | |
41 | ParseContext *pc = &t->pc; | |
42 | int next = END_NOT_FOUND; | |
43 | GetBitContext gb; | |
44 | int consumed = 0; | |
45 | int needed = buf_size ? TAK_MAX_FRAME_HEADER_BYTES : 8; | |
46 | ||
47 | if (s->flags & PARSER_FLAG_COMPLETE_FRAMES) { | |
48 | TAKStreamInfo ti; | |
49 | init_get_bits(&gb, buf, buf_size); | |
50 | if (!ff_tak_decode_frame_header(avctx, &gb, &ti, 127)) | |
51 | s->duration = t->ti.last_frame_samples ? t->ti.last_frame_samples | |
52 | : t->ti.frame_samples; | |
53 | *poutbuf = buf; | |
54 | *poutbuf_size = buf_size; | |
55 | return buf_size; | |
56 | } | |
57 | ||
58 | while (buf_size || t->index + needed <= pc->index) { | |
59 | if (buf_size && t->index + TAK_MAX_FRAME_HEADER_BYTES > pc->index) { | |
60 | int tmp_buf_size = FFMIN(2 * TAK_MAX_FRAME_HEADER_BYTES, | |
61 | buf_size); | |
62 | const uint8_t *tmp_buf = buf; | |
63 | ||
64 | if (ff_combine_frame(pc, END_NOT_FOUND, &tmp_buf, &tmp_buf_size) != -1) | |
65 | return AVERROR(ENOMEM); | |
66 | consumed += tmp_buf_size; | |
67 | buf += tmp_buf_size; | |
68 | buf_size -= tmp_buf_size; | |
69 | } | |
70 | ||
71 | for (; t->index + needed <= pc->index; t->index++) { | |
72 | if (pc->buffer[ t->index ] == 0xFF && | |
73 | pc->buffer[ t->index + 1 ] == 0xA0) { | |
74 | TAKStreamInfo ti; | |
75 | ||
76 | init_get_bits(&gb, pc->buffer + t->index, | |
77 | 8 * (pc->index - t->index)); | |
78 | if (!ff_tak_decode_frame_header(avctx, &gb, | |
79 | pc->frame_start_found ? &ti : &t->ti, 127) && | |
80 | !ff_tak_check_crc(pc->buffer + t->index, | |
81 | get_bits_count(&gb) / 8)) { | |
82 | if (!pc->frame_start_found) { | |
83 | pc->frame_start_found = 1; | |
84 | s->duration = t->ti.last_frame_samples ? | |
85 | t->ti.last_frame_samples : | |
86 | t->ti.frame_samples; | |
87 | s->key_frame = !!(t->ti.flags & TAK_FRAME_FLAG_HAS_INFO); | |
88 | } else { | |
89 | pc->frame_start_found = 0; | |
90 | next = t->index - pc->index; | |
91 | t->index = 0; | |
92 | goto found; | |
93 | } | |
94 | } | |
95 | } | |
96 | } | |
97 | } | |
98 | found: | |
99 | ||
100 | if (consumed && !buf_size && next == END_NOT_FOUND || | |
101 | ff_combine_frame(pc, next, &buf, &buf_size) < 0) { | |
102 | *poutbuf = NULL; | |
103 | *poutbuf_size = 0; | |
104 | return buf_size + consumed; | |
105 | } | |
106 | ||
107 | if (next != END_NOT_FOUND) { | |
108 | next += consumed; | |
109 | pc->overread = FFMAX(0, -next); | |
110 | } | |
111 | ||
112 | *poutbuf = buf; | |
113 | *poutbuf_size = buf_size; | |
114 | return next; | |
115 | } | |
116 | ||
117 | AVCodecParser ff_tak_parser = { | |
118 | .codec_ids = { AV_CODEC_ID_TAK }, | |
119 | .priv_data_size = sizeof(TAKParseContext), | |
120 | .parser_parse = tak_parse, | |
121 | .parser_close = ff_parse_close, | |
122 | }; |