blob: 27c8c3951be00baa0ce1daa4dcab526bb4cf3f76
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 | |
32 | static const uint8_t frame_size[4] = { 24, 20, 4, 1 }; |
33 | |
34 | static 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->codecpar->codec_type = AVMEDIA_TYPE_AUDIO; |
43 | st->codecpar->codec_id = AV_CODEC_ID_G723_1; |
44 | st->codecpar->channel_layout = AV_CH_LAYOUT_MONO; |
45 | st->codecpar->channels = 1; |
46 | st->codecpar->sample_rate = 8000; |
47 | |
48 | avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate); |
49 | st->start_time = 0; |
50 | |
51 | return 0; |
52 | } |
53 | |
54 | static 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_packet_unref(pkt); |
73 | return ret < 0 ? ret : AVERROR_EOF; |
74 | } |
75 | |
76 | return pkt->size; |
77 | } |
78 | |
79 | AVInputFormat 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 |