/*
  * RTP input/output format

  * Copyright (c) 2002 Fabrice Bellard

  *

  * This file is part of FFmpeg.
  *
  * FFmpeg is free software; you can redistribute it and/or

  * modify it under the terms of the GNU Lesser General Public
  * License as published by the Free Software Foundation; either

  * version 2.1 of the License, or (at your option) any later version.

  *

  * FFmpeg is distributed in the hope that it will be useful,

  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Lesser General Public License for more details.
  *
  * You should have received a copy of the GNU Lesser General Public

  * License along with FFmpeg; if not, write to the Free Software

  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

  */

 #include "libavutil/avstring.h"

 #include "libavutil/opt.h"

 #include "avformat.h"
 

 #include "rtp.h"

 /* from http://www.iana.org/assignments/rtp-parameters last updated 05 January 2005 */

 /* payload types >= 96 are dynamic;
  * payload types between 72 and 76 are reserved for RTCP conflict avoidance;
  * all the other payload types not present in the table are unassigned or
  * reserved
  */

 static const struct {

     int pt;

     const char enc_name[6];

     enum AVMediaType codec_type;

     enum AVCodecID codec_id;

     int clock_rate;
     int audio_channels;

 } rtp_payload_types[] = {

   {0, "PCMU",        AVMEDIA_TYPE_AUDIO,   AV_CODEC_ID_PCM_MULAW, 8000, 1},
   {3, "GSM",         AVMEDIA_TYPE_AUDIO,   AV_CODEC_ID_NONE, 8000, 1},
   {4, "G723",        AVMEDIA_TYPE_AUDIO,   AV_CODEC_ID_G723_1, 8000, 1},
   {5, "DVI4",        AVMEDIA_TYPE_AUDIO,   AV_CODEC_ID_NONE, 8000, 1},
   {6, "DVI4",        AVMEDIA_TYPE_AUDIO,   AV_CODEC_ID_NONE, 16000, 1},
   {7, "LPC",         AVMEDIA_TYPE_AUDIO,   AV_CODEC_ID_NONE, 8000, 1},
   {8, "PCMA",        AVMEDIA_TYPE_AUDIO,   AV_CODEC_ID_PCM_ALAW, 8000, 1},
   {9, "G722",        AVMEDIA_TYPE_AUDIO,   AV_CODEC_ID_ADPCM_G722, 8000, 1},
   {10, "L16",        AVMEDIA_TYPE_AUDIO,   AV_CODEC_ID_PCM_S16BE, 44100, 2},
   {11, "L16",        AVMEDIA_TYPE_AUDIO,   AV_CODEC_ID_PCM_S16BE, 44100, 1},
   {12, "QCELP",      AVMEDIA_TYPE_AUDIO,   AV_CODEC_ID_QCELP, 8000, 1},
   {13, "CN",         AVMEDIA_TYPE_AUDIO,   AV_CODEC_ID_NONE, 8000, 1},
   {14, "MPA",        AVMEDIA_TYPE_AUDIO,   AV_CODEC_ID_MP2, -1, -1},
   {14, "MPA",        AVMEDIA_TYPE_AUDIO,   AV_CODEC_ID_MP3, -1, -1},
   {15, "G728",       AVMEDIA_TYPE_AUDIO,   AV_CODEC_ID_NONE, 8000, 1},
   {16, "DVI4",       AVMEDIA_TYPE_AUDIO,   AV_CODEC_ID_NONE, 11025, 1},
   {17, "DVI4",       AVMEDIA_TYPE_AUDIO,   AV_CODEC_ID_NONE, 22050, 1},
   {18, "G729",       AVMEDIA_TYPE_AUDIO,   AV_CODEC_ID_NONE, 8000, 1},
   {25, "CelB",       AVMEDIA_TYPE_VIDEO,   AV_CODEC_ID_NONE, 90000, -1},
   {26, "JPEG",       AVMEDIA_TYPE_VIDEO,   AV_CODEC_ID_MJPEG, 90000, -1},
   {28, "nv",         AVMEDIA_TYPE_VIDEO,   AV_CODEC_ID_NONE, 90000, -1},
   {31, "H261",       AVMEDIA_TYPE_VIDEO,   AV_CODEC_ID_H261, 90000, -1},
   {32, "MPV",        AVMEDIA_TYPE_VIDEO,   AV_CODEC_ID_MPEG1VIDEO, 90000, -1},
   {32, "MPV",        AVMEDIA_TYPE_VIDEO,   AV_CODEC_ID_MPEG2VIDEO, 90000, -1},
   {33, "MP2T",       AVMEDIA_TYPE_DATA,    AV_CODEC_ID_MPEG2TS, 90000, -1},
   {34, "H263",       AVMEDIA_TYPE_VIDEO,   AV_CODEC_ID_H263, 90000, -1},
   {-1, "",           AVMEDIA_TYPE_UNKNOWN, AV_CODEC_ID_NONE, -1, -1}

 };
 

 int ff_rtp_get_codec_info(AVCodecContext *codec, int payload_type)

 {

     int i = 0;
 

     for (i = 0; rtp_payload_types[i].pt >= 0; i++)
         if (rtp_payload_types[i].pt == payload_type) {
             if (rtp_payload_types[i].codec_id != AV_CODEC_ID_NONE) {
                 codec->codec_type = rtp_payload_types[i].codec_type;
                 codec->codec_id = rtp_payload_types[i].codec_id;
                 if (rtp_payload_types[i].audio_channels > 0)
                     codec->channels = rtp_payload_types[i].audio_channels;
                 if (rtp_payload_types[i].clock_rate > 0)
                     codec->sample_rate = rtp_payload_types[i].clock_rate;

                 return 0;
             }
         }

     return -1;

 }
 

 int ff_rtp_get_payload_type(AVFormatContext *fmt,
                             AVCodecContext *codec, int idx)

 {

     int i;

     AVOutputFormat *ofmt = fmt ? fmt->oformat : NULL;
 
     /* Was the payload type already specified for the RTP muxer? */

     if (ofmt && ofmt->priv_class && fmt->priv_data) {

         int64_t payload_type;

         if (av_opt_get_int(fmt->priv_data, "payload_type", 0, &payload_type) >= 0 &&
             payload_type >= 0)

             return (int)payload_type;

     }

     /* static payload type */

     for (i = 0; rtp_payload_types[i].pt >= 0; ++i)
         if (rtp_payload_types[i].codec_id == codec->codec_id) {

             if (codec->codec_id == AV_CODEC_ID_H263 && (!fmt || !fmt->oformat ||

                 !fmt->oformat->priv_class || !fmt->priv_data ||

                 !av_opt_flag_is_set(fmt->priv_data, "rtpflags", "rfc2190")))

                 continue;

             /* G722 has 8000 as nominal rate even if the sample rate is 16000,
              * see section 4.5.2 in RFC 3551. */

             if (codec->codec_id == AV_CODEC_ID_ADPCM_G722 &&

                 codec->sample_rate == 16000 && codec->channels == 1)

                 return rtp_payload_types[i].pt;

             if (codec->codec_type == AVMEDIA_TYPE_AUDIO &&

                 ((rtp_payload_types[i].clock_rate > 0 &&
                   codec->sample_rate != rtp_payload_types[i].clock_rate) ||
                  (rtp_payload_types[i].audio_channels > 0 &&
                   codec->channels != rtp_payload_types[i].audio_channels)))

                 continue;

             return rtp_payload_types[i].pt;

         }

     if (idx < 0)
         idx = codec->codec_type == AVMEDIA_TYPE_AUDIO;
 

     /* dynamic payload type */

     return RTP_PT_PRIVATE + idx;

 }
 

 const char *ff_rtp_enc_name(int payload_type)
 {
     int i;
 

     for (i = 0; rtp_payload_types[i].pt >= 0; i++)
         if (rtp_payload_types[i].pt == payload_type)
             return rtp_payload_types[i].enc_name;

 
     return "";
 }
 

 enum AVCodecID ff_rtp_codec_id(const char *buf, enum AVMediaType codec_type)

 {
     int i;
 

     for (i = 0; rtp_payload_types[i].pt >= 0; i++)

         if (!av_strcasecmp(buf, rtp_payload_types[i].enc_name) && (codec_type == rtp_payload_types[i].codec_type))

             return rtp_payload_types[i].codec_id;

     return AV_CODEC_ID_NONE;

 }