/*
  * 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 "avformat.h"
 

 #include "rtp.h"

 //#define DEBUG
 

 /* 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 CodecID codec_id;
     int clock_rate;
     int audio_channels;
 } AVRtpPayloadTypes[]=

 {

   {0, "PCMU",        AVMEDIA_TYPE_AUDIO,   CODEC_ID_PCM_MULAW, 8000, 1},
   {3, "GSM",         AVMEDIA_TYPE_AUDIO,   CODEC_ID_NONE, 8000, 1},
   {4, "G723",        AVMEDIA_TYPE_AUDIO,   CODEC_ID_NONE, 8000, 1},
   {5, "DVI4",        AVMEDIA_TYPE_AUDIO,   CODEC_ID_NONE, 8000, 1},
   {6, "DVI4",        AVMEDIA_TYPE_AUDIO,   CODEC_ID_NONE, 16000, 1},
   {7, "LPC",         AVMEDIA_TYPE_AUDIO,   CODEC_ID_NONE, 8000, 1},
   {8, "PCMA",        AVMEDIA_TYPE_AUDIO,   CODEC_ID_PCM_ALAW, 8000, 1},

   {9, "G722",        AVMEDIA_TYPE_AUDIO,   CODEC_ID_ADPCM_G722, 8000, 1},

   {10, "L16",        AVMEDIA_TYPE_AUDIO,   CODEC_ID_PCM_S16BE, 44100, 2},
   {11, "L16",        AVMEDIA_TYPE_AUDIO,   CODEC_ID_PCM_S16BE, 44100, 1},
   {12, "QCELP",      AVMEDIA_TYPE_AUDIO,   CODEC_ID_QCELP, 8000, 1},
   {13, "CN",         AVMEDIA_TYPE_AUDIO,   CODEC_ID_NONE, 8000, 1},
   {14, "MPA",        AVMEDIA_TYPE_AUDIO,   CODEC_ID_MP2, -1, -1},
   {14, "MPA",        AVMEDIA_TYPE_AUDIO,   CODEC_ID_MP3, -1, -1},
   {15, "G728",       AVMEDIA_TYPE_AUDIO,   CODEC_ID_NONE, 8000, 1},
   {16, "DVI4",       AVMEDIA_TYPE_AUDIO,   CODEC_ID_NONE, 11025, 1},
   {17, "DVI4",       AVMEDIA_TYPE_AUDIO,   CODEC_ID_NONE, 22050, 1},
   {18, "G729",       AVMEDIA_TYPE_AUDIO,   CODEC_ID_NONE, 8000, 1},
   {25, "CelB",       AVMEDIA_TYPE_VIDEO,   CODEC_ID_NONE, 90000, -1},
   {26, "JPEG",       AVMEDIA_TYPE_VIDEO,   CODEC_ID_MJPEG, 90000, -1},
   {28, "nv",         AVMEDIA_TYPE_VIDEO,   CODEC_ID_NONE, 90000, -1},
   {31, "H261",       AVMEDIA_TYPE_VIDEO,   CODEC_ID_H261, 90000, -1},
   {32, "MPV",        AVMEDIA_TYPE_VIDEO,   CODEC_ID_MPEG1VIDEO, 90000, -1},
   {32, "MPV",        AVMEDIA_TYPE_VIDEO,   CODEC_ID_MPEG2VIDEO, 90000, -1},
   {33, "MP2T",       AVMEDIA_TYPE_DATA,    CODEC_ID_MPEG2TS, 90000, -1},
   {34, "H263",       AVMEDIA_TYPE_VIDEO,   CODEC_ID_H263, 90000, -1},
   {-1, "",           AVMEDIA_TYPE_UNKNOWN, CODEC_ID_NONE, -1, -1}

 };
 

 int ff_rtp_get_codec_info(AVCodecContext *codec, int payload_type)

 {

     int i = 0;
 
     for (i = 0; AVRtpPayloadTypes[i].pt >= 0; i++)
         if (AVRtpPayloadTypes[i].pt == payload_type) {
             if (AVRtpPayloadTypes[i].codec_id != CODEC_ID_NONE) {
                 codec->codec_type = AVRtpPayloadTypes[i].codec_type;
                 codec->codec_id = AVRtpPayloadTypes[i].codec_id;
                 if (AVRtpPayloadTypes[i].audio_channels > 0)
                     codec->channels = AVRtpPayloadTypes[i].audio_channels;
                 if (AVRtpPayloadTypes[i].clock_rate > 0)
                     codec->sample_rate = AVRtpPayloadTypes[i].clock_rate;
                 return 0;
             }
         }

     return -1;

 }
 

 int ff_rtp_get_payload_type(AVCodecContext *codec)

 {

     int i, payload_type;

 
     /* compute the payload type */

     for (payload_type = -1, i = 0; AVRtpPayloadTypes[i].pt >= 0; ++i)
         if (AVRtpPayloadTypes[i].codec_id == codec->codec_id) {

             if (codec->codec_id == CODEC_ID_H263)
                 continue;

             if (codec->codec_id == CODEC_ID_PCM_S16BE)
                 if (codec->channels != AVRtpPayloadTypes[i].audio_channels)
                     continue;
             payload_type = AVRtpPayloadTypes[i].pt;

         }
     return payload_type;
 }
 

 const char *ff_rtp_enc_name(int payload_type)
 {
     int i;
 
     for (i = 0; AVRtpPayloadTypes[i].pt >= 0; i++)
         if (AVRtpPayloadTypes[i].pt == payload_type) {
             return AVRtpPayloadTypes[i].enc_name;
         }
 
     return "";
 }
 

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

 {
     int i;
 
     for (i = 0; AVRtpPayloadTypes[i].pt >= 0; i++)
         if (!strcmp(buf, AVRtpPayloadTypes[i].enc_name) && (codec_type == AVRtpPayloadTypes[i].codec_type)){
             return AVRtpPayloadTypes[i].codec_id;
         }
 
     return CODEC_ID_NONE;
 }