gsm_parser.c
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1 /*
2  * Copyright (c) 2012 Justin Ruggles
3  *
4  * This file is part of Libav.
5  *
6  * Libav 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  * Libav 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 Libav; if not, write to the Free Software
18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19  */
20 
28 #include "parser.h"
29 #include "gsm.h"
30 
31 typedef struct GSMParseContext {
34  int remaining;
36 
38  const uint8_t **poutbuf, int *poutbuf_size,
39  const uint8_t *buf, int buf_size)
40 {
41  GSMParseContext *s = s1->priv_data;
42  ParseContext *pc = &s->pc;
43  int next;
44 
45  if (!s->block_size) {
46  switch (avctx->codec_id) {
47  case CODEC_ID_GSM: s->block_size = GSM_BLOCK_SIZE; break;
49  default:
50  return AVERROR(EINVAL);
51  }
52  }
53 
54  if (!s->remaining)
55  s->remaining = s->block_size;
56  if (s->remaining <= buf_size) {
57  next = s->remaining;
58  s->remaining = 0;
59  } else {
60  next = END_NOT_FOUND;
61  s->remaining -= buf_size;
62  }
63 
64  if (ff_combine_frame(pc, next, &buf, &buf_size) < 0 || !buf_size) {
65  *poutbuf = NULL;
66  *poutbuf_size = 0;
67  return buf_size;
68  }
69  *poutbuf = buf;
70  *poutbuf_size = buf_size;
71  return next;
72 }
73 
76  .priv_data_size = sizeof(GSMParseContext),
77  .parser_parse = gsm_parse,
78  .parser_close = ff_parse_close,
79 };