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