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1 | /* |
2 | * Copyright (c) 2012 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 | * GSM audio parser | |
24 | * | |
25 | * Splits packets into individual blocks. | |
26 | */ | |
27 | ||
28 | #include "parser.h" | |
29 | #include "gsm.h" | |
30 | ||
31 | typedef struct GSMParseContext { | |
32 | ParseContext pc; | |
33 | int block_size; | |
34 | int duration; | |
35 | int remaining; | |
36 | } GSMParseContext; | |
37 | ||
38 | static int gsm_parse(AVCodecParserContext *s1, AVCodecContext *avctx, | |
39 | const uint8_t **poutbuf, int *poutbuf_size, | |
40 | const uint8_t *buf, int buf_size) | |
41 | { | |
42 | GSMParseContext *s = s1->priv_data; | |
43 | ParseContext *pc = &s->pc; | |
44 | int next; | |
45 | ||
46 | if (!s->block_size) { | |
47 | switch (avctx->codec_id) { | |
48 | case AV_CODEC_ID_GSM: | |
49 | s->block_size = GSM_BLOCK_SIZE; | |
50 | s->duration = GSM_FRAME_SIZE; | |
51 | break; | |
52 | case AV_CODEC_ID_GSM_MS: | |
53 | s->block_size = avctx->block_align ? avctx->block_align | |
54 | : GSM_MS_BLOCK_SIZE; | |
55 | s->duration = GSM_FRAME_SIZE * 2; | |
56 | break; | |
57 | default: | |
58 | *poutbuf = buf; | |
59 | *poutbuf_size = buf_size; | |
60 | av_log(avctx, AV_LOG_ERROR, "Invalid codec_id\n"); | |
61 | return buf_size; | |
62 | } | |
63 | } | |
64 | ||
65 | if (!s->remaining) | |
66 | s->remaining = s->block_size; | |
67 | if (s->remaining <= buf_size) { | |
68 | next = s->remaining; | |
69 | s->remaining = 0; | |
70 | } else { | |
71 | next = END_NOT_FOUND; | |
72 | s->remaining -= buf_size; | |
73 | } | |
74 | ||
75 | if (ff_combine_frame(pc, next, &buf, &buf_size) < 0 || !buf_size) { | |
76 | *poutbuf = NULL; | |
77 | *poutbuf_size = 0; | |
78 | return buf_size; | |
79 | } | |
80 | ||
81 | s1->duration = s->duration; | |
82 | ||
83 | *poutbuf = buf; | |
84 | *poutbuf_size = buf_size; | |
85 | return next; | |
86 | } | |
87 | ||
88 | AVCodecParser ff_gsm_parser = { | |
89 | .codec_ids = { AV_CODEC_ID_GSM, AV_CODEC_ID_GSM_MS }, | |
90 | .priv_data_size = sizeof(GSMParseContext), | |
91 | .parser_parse = gsm_parse, | |
92 | .parser_close = ff_parse_close, | |
93 | }; |