1/*
2 * RTP input/output format
3 * Copyright (c) 2002 Fabrice Bellard
4 *
5 * This file is part of Libav.
6 *
7 * Libav 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 * Libav 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 Libav; 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/opt.h>
23#include "avformat.h"
24
25#include "rtp.h"
26
27//#define DEBUG
28
29/* from http://www.iana.org/assignments/rtp-parameters last updated 05 January 2005 */
30/* payload types >= 96 are dynamic;
31 * payload types between 72 and 76 are reserved for RTCP conflict avoidance;
32 * all the other payload types not present in the table are unassigned or
33 * reserved
34 */
35static const struct
36{
37    int pt;
38    const char enc_name[6];
39    enum AVMediaType codec_type;
40    enum CodecID codec_id;
41    int clock_rate;
42    int audio_channels;
43} AVRtpPayloadTypes[]=
44{
45  {0, "PCMU",        AVMEDIA_TYPE_AUDIO,   CODEC_ID_PCM_MULAW, 8000, 1},
46  {3, "GSM",         AVMEDIA_TYPE_AUDIO,   CODEC_ID_NONE, 8000, 1},
47  {4, "G723",        AVMEDIA_TYPE_AUDIO,   CODEC_ID_NONE, 8000, 1},
48  {5, "DVI4",        AVMEDIA_TYPE_AUDIO,   CODEC_ID_NONE, 8000, 1},
49  {6, "DVI4",        AVMEDIA_TYPE_AUDIO,   CODEC_ID_NONE, 16000, 1},
50  {7, "LPC",         AVMEDIA_TYPE_AUDIO,   CODEC_ID_NONE, 8000, 1},
51  {8, "PCMA",        AVMEDIA_TYPE_AUDIO,   CODEC_ID_PCM_ALAW, 8000, 1},
52  {9, "G722",        AVMEDIA_TYPE_AUDIO,   CODEC_ID_ADPCM_G722, 8000, 1},
53  {10, "L16",        AVMEDIA_TYPE_AUDIO,   CODEC_ID_PCM_S16BE, 44100, 2},
54  {11, "L16",        AVMEDIA_TYPE_AUDIO,   CODEC_ID_PCM_S16BE, 44100, 1},
55  {12, "QCELP",      AVMEDIA_TYPE_AUDIO,   CODEC_ID_QCELP, 8000, 1},
56  {13, "CN",         AVMEDIA_TYPE_AUDIO,   CODEC_ID_NONE, 8000, 1},
57  {14, "MPA",        AVMEDIA_TYPE_AUDIO,   CODEC_ID_MP2, -1, -1},
58  {14, "MPA",        AVMEDIA_TYPE_AUDIO,   CODEC_ID_MP3, -1, -1},
59  {15, "G728",       AVMEDIA_TYPE_AUDIO,   CODEC_ID_NONE, 8000, 1},
60  {16, "DVI4",       AVMEDIA_TYPE_AUDIO,   CODEC_ID_NONE, 11025, 1},
61  {17, "DVI4",       AVMEDIA_TYPE_AUDIO,   CODEC_ID_NONE, 22050, 1},
62  {18, "G729",       AVMEDIA_TYPE_AUDIO,   CODEC_ID_NONE, 8000, 1},
63  {25, "CelB",       AVMEDIA_TYPE_VIDEO,   CODEC_ID_NONE, 90000, -1},
64  {26, "JPEG",       AVMEDIA_TYPE_VIDEO,   CODEC_ID_MJPEG, 90000, -1},
65  {28, "nv",         AVMEDIA_TYPE_VIDEO,   CODEC_ID_NONE, 90000, -1},
66  {31, "H261",       AVMEDIA_TYPE_VIDEO,   CODEC_ID_H261, 90000, -1},
67  {32, "MPV",        AVMEDIA_TYPE_VIDEO,   CODEC_ID_MPEG1VIDEO, 90000, -1},
68  {32, "MPV",        AVMEDIA_TYPE_VIDEO,   CODEC_ID_MPEG2VIDEO, 90000, -1},
69  {33, "MP2T",       AVMEDIA_TYPE_DATA,    CODEC_ID_MPEG2TS, 90000, -1},
70  {34, "H263",       AVMEDIA_TYPE_VIDEO,   CODEC_ID_H263, 90000, -1},
71  {-1, "",           AVMEDIA_TYPE_UNKNOWN, CODEC_ID_NONE, -1, -1}
72};
73
74int ff_rtp_get_codec_info(AVCodecContext *codec, int payload_type)
75{
76    int i = 0;
77
78    for (i = 0; AVRtpPayloadTypes[i].pt >= 0; i++)
79        if (AVRtpPayloadTypes[i].pt == payload_type) {
80            if (AVRtpPayloadTypes[i].codec_id != CODEC_ID_NONE) {
81                codec->codec_type = AVRtpPayloadTypes[i].codec_type;
82                codec->codec_id = AVRtpPayloadTypes[i].codec_id;
83                if (AVRtpPayloadTypes[i].audio_channels > 0)
84                    codec->channels = AVRtpPayloadTypes[i].audio_channels;
85                if (AVRtpPayloadTypes[i].clock_rate > 0)
86                    codec->sample_rate = AVRtpPayloadTypes[i].clock_rate;
87                return 0;
88            }
89        }
90    return -1;
91}
92
93int ff_rtp_get_payload_type(AVFormatContext *fmt, AVCodecContext *codec)
94{
95    int i;
96    AVOutputFormat *ofmt = fmt ? fmt->oformat : NULL;
97
98    /* Was the payload type already specified for the RTP muxer? */
99    if (ofmt && ofmt->priv_class) {
100        int64_t payload_type;
101        if (av_opt_get_int(fmt->priv_data, "payload_type", 0, &payload_type) >= 0 &&
102            payload_type >= 0)
103            return (int)payload_type;
104    }
105
106    /* static payload type */
107    for (i = 0; AVRtpPayloadTypes[i].pt >= 0; ++i)
108        if (AVRtpPayloadTypes[i].codec_id == codec->codec_id) {
109            if (codec->codec_id == CODEC_ID_H263)
110                continue;
111            if (codec->codec_id == CODEC_ID_PCM_S16BE)
112                if (codec->channels != AVRtpPayloadTypes[i].audio_channels)
113                    continue;
114            return AVRtpPayloadTypes[i].pt;
115        }
116
117    /* dynamic payload type */
118    return RTP_PT_PRIVATE + (codec->codec_type == AVMEDIA_TYPE_AUDIO);
119}
120
121const char *ff_rtp_enc_name(int payload_type)
122{
123    int i;
124
125    for (i = 0; AVRtpPayloadTypes[i].pt >= 0; i++)
126        if (AVRtpPayloadTypes[i].pt == payload_type) {
127            return AVRtpPayloadTypes[i].enc_name;
128        }
129
130    return "";
131}
132
133enum CodecID ff_rtp_codec_id(const char *buf, enum AVMediaType codec_type)
134{
135    int i;
136
137    for (i = 0; AVRtpPayloadTypes[i].pt >= 0; i++)
138        if (!strcmp(buf, AVRtpPayloadTypes[i].enc_name) && (codec_type == AVRtpPayloadTypes[i].codec_type)){
139            return AVRtpPayloadTypes[i].codec_id;
140        }
141
142    return CODEC_ID_NONE;
143}
144