/* * 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 "libavcodec/bitstream.h"#include "avformat.h"#include <unistd.h>#include "network.h"#include "rtp_internal.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 CodecType codec_type;    enum CodecID codec_id;    int clock_rate;    int audio_channels;} AVRtpPayloadTypes[]={  {0, "PCMU",        CODEC_TYPE_AUDIO,   CODEC_ID_PCM_MULAW, 8000, 1},  {3, "GSM",         CODEC_TYPE_AUDIO,   CODEC_ID_NONE, 8000, 1},  {4, "G723",        CODEC_TYPE_AUDIO,   CODEC_ID_NONE, 8000, 1},  {5, "DVI4",        CODEC_TYPE_AUDIO,   CODEC_ID_NONE, 8000, 1},  {6, "DVI4",        CODEC_TYPE_AUDIO,   CODEC_ID_NONE, 16000, 1},  {7, "LPC",         CODEC_TYPE_AUDIO,   CODEC_ID_NONE, 8000, 1},  {8, "PCMA",        CODEC_TYPE_AUDIO,   CODEC_ID_PCM_ALAW, 8000, 1},  {9, "G722",        CODEC_TYPE_AUDIO,   CODEC_ID_NONE, 8000, 1},  {10, "L16",        CODEC_TYPE_AUDIO,   CODEC_ID_PCM_S16BE, 44100, 2},  {11, "L16",        CODEC_TYPE_AUDIO,   CODEC_ID_PCM_S16BE, 44100, 1},  {12, "QCELP",      CODEC_TYPE_AUDIO,   CODEC_ID_QCELP, 8000, 1},  {13, "CN",         CODEC_TYPE_AUDIO,   CODEC_ID_NONE, 8000, 1},  {14, "MPA",        CODEC_TYPE_AUDIO,   CODEC_ID_MP2, -1, -1},  {14, "MPA",        CODEC_TYPE_AUDIO,   CODEC_ID_MP3, -1, -1},  {15, "G728",       CODEC_TYPE_AUDIO,   CODEC_ID_NONE, 8000, 1},  {16, "DVI4",       CODEC_TYPE_AUDIO,   CODEC_ID_NONE, 11025, 1},  {17, "DVI4",       CODEC_TYPE_AUDIO,   CODEC_ID_NONE, 22050, 1},  {18, "G729",       CODEC_TYPE_AUDIO,   CODEC_ID_NONE, 8000, 1},  {25, "CelB",       CODEC_TYPE_VIDEO,   CODEC_ID_NONE, 90000, -1},  {26, "JPEG",       CODEC_TYPE_VIDEO,   CODEC_ID_MJPEG, 90000, -1},  {28, "nv",         CODEC_TYPE_VIDEO,   CODEC_ID_NONE, 90000, -1},  {31, "H261",       CODEC_TYPE_VIDEO,   CODEC_ID_H261, 90000, -1},  {32, "MPV",        CODEC_TYPE_VIDEO,   CODEC_ID_MPEG1VIDEO, 90000, -1},  {32, "MPV",        CODEC_TYPE_VIDEO,   CODEC_ID_MPEG2VIDEO, 90000, -1},  {33, "MP2T",       CODEC_TYPE_DATA,    CODEC_ID_MPEG2TS, 90000, -1},  {34, "H263",       CODEC_TYPE_VIDEO,   CODEC_ID_H263, 90000, -1},  {-1, "",           CODEC_TYPE_UNKNOWN, CODEC_ID_NONE, -1, -1}};int 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 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_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 CodecType 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;}