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 * XMA2 audio parser
22 */
23
24#include "parser.h"
25
26typedef struct XMAParserContext{
27    int skip_packets;
28} XMAParserContext;
29
30static int xma_parse(AVCodecParserContext *s1, AVCodecContext *avctx,
31                     const uint8_t **poutbuf, int *poutbuf_size,
32                     const uint8_t *buf, int buf_size)
33{
34    XMAParserContext *s = s1->priv_data;
35
36    if (buf_size % 2048 == 0) {
37        int duration = 0, packet, nb_packets = buf_size / 2048;
38
39        for (packet = 0; packet < nb_packets; packet++) {
40            if (s->skip_packets == 0) {
41                duration += buf[packet * 2048] * 128;
42                s->skip_packets = buf[packet * 2048 + 3] + 1;
43            }
44            s->skip_packets--;
45        }
46
47        s1->duration = duration;
48        s1->key_frame = !!duration;
49    }
50
51    /* always return the full packet. this parser isn't doing any splitting or
52       combining, only packet analysis */
53    *poutbuf      = buf;
54    *poutbuf_size = buf_size;
55    return buf_size;
56}
57
58const AVCodecParser ff_xma_parser = {
59    .codec_ids      = { AV_CODEC_ID_XMA2 },
60    .priv_data_size = sizeof(XMAParserContext),
61    .parser_parse   = xma_parse,
62};
63