FFmpeg
 All Data Structures Files Functions Variables Typedefs Enumerations Enumerator Macros Groups Pages
g723_1.c
Go to the documentation of this file.
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 
28 #include "avformat.h"
29 #include "internal.h"
30 
31 static const uint8_t frame_size[4] = { 24, 20, 4, 1 };
32 
34 {
35  AVStream *st;
36 
37  st = avformat_new_stream(s, NULL);
38  if (!st)
39  return AVERROR(ENOMEM);
40 
44  st->codec->channels = 1;
45  st->codec->sample_rate = 8000;
46 
47  avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate);
48  st->start_time = 0;
49 
50  return 0;
51 }
52 
54 {
55  int size, byte, ret;
56 
57  pkt->pos = avio_tell(s->pb);
58  byte = avio_r8(s->pb);
59  size = frame_size[byte & 3];
60 
61  ret = av_new_packet(pkt, size);
62  if (ret < 0)
63  return ret;
64 
65  pkt->data[0] = byte;
66  pkt->duration = 240;
67  pkt->stream_index = 0;
68 
69  ret = avio_read(s->pb, pkt->data + 1, size - 1);
70  if (ret < size - 1) {
71  av_free_packet(pkt);
72  return ret < 0 ? ret : AVERROR_EOF;
73  }
74 
75  return pkt->size;
76 }
77 
79  .name = "g723_1",
80  .long_name = NULL_IF_CONFIG_SMALL("G.723.1"),
81  .read_header = g723_1_init,
82  .read_packet = g723_1_read_packet,
83  .extensions = "tco,rco,g723_1",
84  .flags = AVFMT_GENERIC_INDEX
85 };