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2ba45a60 DM |
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->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 | ||
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_free_packet(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 | }; |