1/*
2 * G.723.1 demuxer
3 * Copyright (c) 2010 Mohamed Naufal Basheer
4 *
5 * This file is part of FFmpeg.
6 *
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
11 *
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
22/**
23 * @file
24 * G.723.1 demuxer
25 */
26
27#include "libavutil/attributes.h"
28#include "libavutil/channel_layout.h"
29#include "avformat.h"
30#include "internal.h"
31
32static const uint8_t frame_size[4] = { 24, 20, 4, 1 };
33
34static av_cold int g723_1_init(AVFormatContext *s)
35{
36    AVStream *st;
37
38    st = avformat_new_stream(s, NULL);
39    if (!st)
40        return AVERROR(ENOMEM);
41
42    st->codec->codec_type     = AVMEDIA_TYPE_AUDIO;
43    st->codec->codec_id       = AV_CODEC_ID_G723_1;
44    st->codec->channel_layout = AV_CH_LAYOUT_MONO;
45    st->codec->channels       = 1;
46    st->codec->sample_rate    = 8000;
47
48    avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate);
49    st->start_time = 0;
50
51    return 0;
52}
53
54static int g723_1_read_packet(AVFormatContext *s, AVPacket *pkt)
55{
56    int size, byte, ret;
57
58    pkt->pos = avio_tell(s->pb);
59    byte     = avio_r8(s->pb);
60    size     = frame_size[byte & 3];
61
62    ret = av_new_packet(pkt, size);
63    if (ret < 0)
64        return ret;
65
66    pkt->data[0]      = byte;
67    pkt->duration     = 240;
68    pkt->stream_index = 0;
69
70    ret = avio_read(s->pb, pkt->data + 1, size - 1);
71    if (ret < size - 1) {
72        av_free_packet(pkt);
73        return ret < 0 ? ret : AVERROR_EOF;
74    }
75
76    return pkt->size;
77}
78
79AVInputFormat ff_g723_1_demuxer = {
80    .name        = "g723_1",
81    .long_name   = NULL_IF_CONFIG_SMALL("G.723.1"),
82    .read_header = g723_1_init,
83    .read_packet = g723_1_read_packet,
84    .extensions  = "tco,rco,g723_1",
85    .flags       = AVFMT_GENERIC_INDEX
86};
87