1/*
2 * This file is part of FFmpeg.
3 *
4 * FFmpeg is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Lesser General Public
6 * License as published by the Free Software Foundation; either
7 * version 2.1 of the License, or (at your option) any later version.
8 *
9 * FFmpeg is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
12 * Lesser General Public License for more details.
13 *
14 * You should have received a copy of the GNU Lesser General Public
15 * License along with FFmpeg; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
17 */
18
19/**
20 * @file
21 * Sipr audio parser
22 */
23
24#include "parser.h"
25
26typedef struct SiprParserContext{
27    ParseContext pc;
28} SiprParserContext;
29
30static int sipr_split(AVCodecContext *avctx, const uint8_t *buf, int buf_size)
31{
32    int next;
33
34    switch (avctx->block_align) {
35    case 20:
36    case 19:
37    case 29:
38    case 37: next = avctx->block_align; break;
39    default:
40        if      (avctx->bit_rate > 12200) next = 20;
41        else if (avctx->bit_rate > 7500 ) next = 19;
42        else if (avctx->bit_rate > 5750 ) next = 29;
43        else                              next = 37;
44    }
45
46    return FFMIN(next, buf_size);
47}
48
49static int sipr_parse(AVCodecParserContext *s1, AVCodecContext *avctx,
50                      const uint8_t **poutbuf, int *poutbuf_size,
51                      const uint8_t *buf, int buf_size)
52{
53    SiprParserContext *s = s1->priv_data;
54    ParseContext *pc = &s->pc;
55    int next;
56
57    next = sipr_split(avctx, buf, buf_size);
58    if (ff_combine_frame(pc, next, &buf, &buf_size) < 0) {
59        *poutbuf = NULL;
60        *poutbuf_size = 0;
61        return buf_size;
62    }
63
64    *poutbuf      = buf;
65    *poutbuf_size = buf_size;
66    return next;
67}
68
69const AVCodecParser ff_sipr_parser = {
70    .codec_ids      = { AV_CODEC_ID_SIPR },
71    .priv_data_size = sizeof(SiprParserContext),
72    .parser_parse   = sipr_parse,
73    .parser_close   = ff_parse_close,
74};
75