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1 | /* |
2 | * Copyright (c) 2011 Justin Ruggles | |
3 | * | |
4 | * This file is part of FFmpeg. | |
5 | * | |
6 | * FFmpeg is free software; you can redistribute it and/or | |
7 | * modify it under the terms of the GNU Lesser General Public | |
8 | * License as published by the Free Software Foundation; either | |
9 | * version 2.1 of the License, or (at your option) any later version. | |
10 | * | |
11 | * FFmpeg is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
14 | * Lesser General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU Lesser General Public | |
17 | * License along with FFmpeg; if not, write to the Free Software | |
18 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
19 | */ | |
20 | ||
21 | /** | |
22 | * @file | |
23 | * ADX audio parser | |
24 | * | |
25 | * Splits packets into individual blocks. | |
26 | */ | |
27 | ||
28 | #include "libavutil/intreadwrite.h" | |
29 | #include "parser.h" | |
30 | #include "adx.h" | |
31 | ||
32 | typedef struct ADXParseContext { | |
33 | ParseContext pc; | |
34 | int header_size; | |
35 | int block_size; | |
36 | int remaining; | |
37 | } ADXParseContext; | |
38 | ||
39 | static int adx_parse(AVCodecParserContext *s1, | |
40 | AVCodecContext *avctx, | |
41 | const uint8_t **poutbuf, int *poutbuf_size, | |
42 | const uint8_t *buf, int buf_size) | |
43 | { | |
44 | ADXParseContext *s = s1->priv_data; | |
45 | ParseContext *pc = &s->pc; | |
46 | int next = END_NOT_FOUND; | |
47 | int i; | |
48 | uint64_t state = pc->state64; | |
49 | ||
50 | if (!s->header_size) { | |
51 | for (i = 0; i < buf_size; i++) { | |
52 | state = (state << 8) | buf[i]; | |
53 | /* check for fixed fields in ADX header for possible match */ | |
54 | if ((state & 0xFFFF0000FFFFFF00) == 0x8000000003120400ULL) { | |
55 | int channels = state & 0xFF; | |
56 | int header_size = ((state >> 32) & 0xFFFF) + 4; | |
57 | if (channels > 0 && header_size >= 8) { | |
58 | s->header_size = header_size; | |
59 | s->block_size = BLOCK_SIZE * channels; | |
60 | s->remaining = i - 7 + s->header_size + s->block_size; | |
61 | break; | |
62 | } | |
63 | } | |
64 | } | |
65 | pc->state64 = state; | |
66 | } | |
67 | ||
68 | if (s->header_size) { | |
69 | if (!s->remaining) | |
70 | s->remaining = s->block_size; | |
71 | if (s->remaining <= buf_size) { | |
72 | next = s->remaining; | |
73 | s->remaining = 0; | |
74 | } else | |
75 | s->remaining -= buf_size; | |
76 | } | |
77 | ||
78 | if (ff_combine_frame(pc, next, &buf, &buf_size) < 0 || !buf_size) { | |
79 | *poutbuf = NULL; | |
80 | *poutbuf_size = 0; | |
81 | return buf_size; | |
82 | } | |
83 | ||
84 | s1->duration = BLOCK_SAMPLES; | |
85 | ||
86 | *poutbuf = buf; | |
87 | *poutbuf_size = buf_size; | |
88 | return next; | |
89 | } | |
90 | ||
91 | AVCodecParser ff_adx_parser = { | |
92 | .codec_ids = { AV_CODEC_ID_ADPCM_ADX }, | |
93 | .priv_data_size = sizeof(ADXParseContext), | |
94 | .parser_parse = adx_parse, | |
95 | .parser_close = ff_parse_close, | |
96 | }; |