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1 | /* |
2 | * RTP input/output format | |
3 | * Copyright (c) 2002 Fabrice Bellard | |
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 | #include "libavutil/avstring.h" | |
23 | #include "libavutil/opt.h" | |
24 | #include "avformat.h" | |
25 | ||
26 | #include "rtp.h" | |
27 | ||
28 | /* from http://www.iana.org/assignments/rtp-parameters last updated 05 January 2005 */ | |
29 | /* payload types >= 96 are dynamic; | |
30 | * payload types between 72 and 76 are reserved for RTCP conflict avoidance; | |
31 | * all the other payload types not present in the table are unassigned or | |
32 | * reserved | |
33 | */ | |
34 | static const struct { | |
35 | int pt; | |
36 | const char enc_name[6]; | |
37 | enum AVMediaType codec_type; | |
38 | enum AVCodecID codec_id; | |
39 | int clock_rate; | |
40 | int audio_channels; | |
41 | } rtp_payload_types[] = { | |
42 | {0, "PCMU", AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_PCM_MULAW, 8000, 1}, | |
43 | {3, "GSM", AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_NONE, 8000, 1}, | |
44 | {4, "G723", AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_G723_1, 8000, 1}, | |
45 | {5, "DVI4", AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_NONE, 8000, 1}, | |
46 | {6, "DVI4", AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_NONE, 16000, 1}, | |
47 | {7, "LPC", AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_NONE, 8000, 1}, | |
48 | {8, "PCMA", AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_PCM_ALAW, 8000, 1}, | |
49 | {9, "G722", AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_ADPCM_G722, 8000, 1}, | |
50 | {10, "L16", AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_PCM_S16BE, 44100, 2}, | |
51 | {11, "L16", AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_PCM_S16BE, 44100, 1}, | |
52 | {12, "QCELP", AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_QCELP, 8000, 1}, | |
53 | {13, "CN", AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_NONE, 8000, 1}, | |
54 | {14, "MPA", AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_MP2, -1, -1}, | |
55 | {14, "MPA", AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_MP3, -1, -1}, | |
56 | {15, "G728", AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_NONE, 8000, 1}, | |
57 | {16, "DVI4", AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_NONE, 11025, 1}, | |
58 | {17, "DVI4", AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_NONE, 22050, 1}, | |
59 | {18, "G729", AVMEDIA_TYPE_AUDIO, AV_CODEC_ID_NONE, 8000, 1}, | |
60 | {25, "CelB", AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_NONE, 90000, -1}, | |
61 | {26, "JPEG", AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_MJPEG, 90000, -1}, | |
62 | {28, "nv", AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_NONE, 90000, -1}, | |
63 | {31, "H261", AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_H261, 90000, -1}, | |
64 | {32, "MPV", AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_MPEG1VIDEO, 90000, -1}, | |
65 | {32, "MPV", AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_MPEG2VIDEO, 90000, -1}, | |
66 | {33, "MP2T", AVMEDIA_TYPE_DATA, AV_CODEC_ID_MPEG2TS, 90000, -1}, | |
67 | {34, "H263", AVMEDIA_TYPE_VIDEO, AV_CODEC_ID_H263, 90000, -1}, | |
68 | {-1, "", AVMEDIA_TYPE_UNKNOWN, AV_CODEC_ID_NONE, -1, -1} | |
69 | }; | |
70 | ||
71 | int ff_rtp_get_codec_info(AVCodecContext *codec, int payload_type) | |
72 | { | |
73 | int i = 0; | |
74 | ||
75 | for (i = 0; rtp_payload_types[i].pt >= 0; i++) | |
76 | if (rtp_payload_types[i].pt == payload_type) { | |
77 | if (rtp_payload_types[i].codec_id != AV_CODEC_ID_NONE) { | |
78 | codec->codec_type = rtp_payload_types[i].codec_type; | |
79 | codec->codec_id = rtp_payload_types[i].codec_id; | |
80 | if (rtp_payload_types[i].audio_channels > 0) | |
81 | codec->channels = rtp_payload_types[i].audio_channels; | |
82 | if (rtp_payload_types[i].clock_rate > 0) | |
83 | codec->sample_rate = rtp_payload_types[i].clock_rate; | |
84 | return 0; | |
85 | } | |
86 | } | |
87 | return -1; | |
88 | } | |
89 | ||
90 | int ff_rtp_get_payload_type(AVFormatContext *fmt, | |
91 | AVCodecContext *codec, int idx) | |
92 | { | |
93 | int i; | |
94 | AVOutputFormat *ofmt = fmt ? fmt->oformat : NULL; | |
95 | ||
96 | /* Was the payload type already specified for the RTP muxer? */ | |
97 | if (ofmt && ofmt->priv_class && fmt->priv_data) { | |
98 | int64_t payload_type; | |
99 | if (av_opt_get_int(fmt->priv_data, "payload_type", 0, &payload_type) >= 0 && | |
100 | payload_type >= 0) | |
101 | return (int)payload_type; | |
102 | } | |
103 | ||
104 | /* static payload type */ | |
105 | for (i = 0; rtp_payload_types[i].pt >= 0; ++i) | |
106 | if (rtp_payload_types[i].codec_id == codec->codec_id) { | |
107 | if (codec->codec_id == AV_CODEC_ID_H263 && (!fmt || !fmt->oformat || | |
108 | !fmt->oformat->priv_class || !fmt->priv_data || | |
109 | !av_opt_flag_is_set(fmt->priv_data, "rtpflags", "rfc2190"))) | |
110 | continue; | |
111 | /* G722 has 8000 as nominal rate even if the sample rate is 16000, | |
112 | * see section 4.5.2 in RFC 3551. */ | |
113 | if (codec->codec_id == AV_CODEC_ID_ADPCM_G722 && | |
114 | codec->sample_rate == 16000 && codec->channels == 1) | |
115 | return rtp_payload_types[i].pt; | |
116 | if (codec->codec_type == AVMEDIA_TYPE_AUDIO && | |
117 | ((rtp_payload_types[i].clock_rate > 0 && | |
118 | codec->sample_rate != rtp_payload_types[i].clock_rate) || | |
119 | (rtp_payload_types[i].audio_channels > 0 && | |
120 | codec->channels != rtp_payload_types[i].audio_channels))) | |
121 | continue; | |
122 | return rtp_payload_types[i].pt; | |
123 | } | |
124 | ||
125 | if (idx < 0) | |
126 | idx = codec->codec_type == AVMEDIA_TYPE_AUDIO; | |
127 | ||
128 | /* dynamic payload type */ | |
129 | return RTP_PT_PRIVATE + idx; | |
130 | } | |
131 | ||
132 | const char *ff_rtp_enc_name(int payload_type) | |
133 | { | |
134 | int i; | |
135 | ||
136 | for (i = 0; rtp_payload_types[i].pt >= 0; i++) | |
137 | if (rtp_payload_types[i].pt == payload_type) | |
138 | return rtp_payload_types[i].enc_name; | |
139 | ||
140 | return ""; | |
141 | } | |
142 | ||
143 | enum AVCodecID ff_rtp_codec_id(const char *buf, enum AVMediaType codec_type) | |
144 | { | |
145 | int i; | |
146 | ||
147 | for (i = 0; rtp_payload_types[i].pt >= 0; i++) | |
148 | if (!av_strcasecmp(buf, rtp_payload_types[i].enc_name) && (codec_type == rtp_payload_types[i].codec_type)) | |
149 | return rtp_payload_types[i].codec_id; | |
150 | ||
151 | return AV_CODEC_ID_NONE; | |
152 | } |