rtp.c 5.5 KB

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  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. #include <libavutil/opt.h>
  22. #include "avformat.h"
  23. #include "rtp.h"
  24. //#define DEBUG
  25. /* from http://www.iana.org/assignments/rtp-parameters last updated 05 January 2005 */
  26. /* payload types >= 96 are dynamic;
  27. * payload types between 72 and 76 are reserved for RTCP conflict avoidance;
  28. * all the other payload types not present in the table are unassigned or
  29. * reserved
  30. */
  31. static const struct
  32. {
  33. int pt;
  34. const char enc_name[6];
  35. enum AVMediaType codec_type;
  36. enum CodecID codec_id;
  37. int clock_rate;
  38. int audio_channels;
  39. } AVRtpPayloadTypes[]=
  40. {
  41. {0, "PCMU", AVMEDIA_TYPE_AUDIO, CODEC_ID_PCM_MULAW, 8000, 1},
  42. {3, "GSM", AVMEDIA_TYPE_AUDIO, CODEC_ID_NONE, 8000, 1},
  43. {4, "G723", AVMEDIA_TYPE_AUDIO, CODEC_ID_G723_1, 8000, 1},
  44. {5, "DVI4", AVMEDIA_TYPE_AUDIO, CODEC_ID_NONE, 8000, 1},
  45. {6, "DVI4", AVMEDIA_TYPE_AUDIO, CODEC_ID_NONE, 16000, 1},
  46. {7, "LPC", AVMEDIA_TYPE_AUDIO, CODEC_ID_NONE, 8000, 1},
  47. {8, "PCMA", AVMEDIA_TYPE_AUDIO, CODEC_ID_PCM_ALAW, 8000, 1},
  48. {9, "G722", AVMEDIA_TYPE_AUDIO, CODEC_ID_ADPCM_G722, 8000, 1},
  49. {10, "L16", AVMEDIA_TYPE_AUDIO, CODEC_ID_PCM_S16BE, 44100, 2},
  50. {11, "L16", AVMEDIA_TYPE_AUDIO, CODEC_ID_PCM_S16BE, 44100, 1},
  51. {12, "QCELP", AVMEDIA_TYPE_AUDIO, CODEC_ID_QCELP, 8000, 1},
  52. {13, "CN", AVMEDIA_TYPE_AUDIO, CODEC_ID_NONE, 8000, 1},
  53. {14, "MPA", AVMEDIA_TYPE_AUDIO, CODEC_ID_MP2, -1, -1},
  54. {14, "MPA", AVMEDIA_TYPE_AUDIO, CODEC_ID_MP3, -1, -1},
  55. {15, "G728", AVMEDIA_TYPE_AUDIO, CODEC_ID_NONE, 8000, 1},
  56. {16, "DVI4", AVMEDIA_TYPE_AUDIO, CODEC_ID_NONE, 11025, 1},
  57. {17, "DVI4", AVMEDIA_TYPE_AUDIO, CODEC_ID_NONE, 22050, 1},
  58. {18, "G729", AVMEDIA_TYPE_AUDIO, CODEC_ID_NONE, 8000, 1},
  59. {25, "CelB", AVMEDIA_TYPE_VIDEO, CODEC_ID_NONE, 90000, -1},
  60. {26, "JPEG", AVMEDIA_TYPE_VIDEO, CODEC_ID_MJPEG, 90000, -1},
  61. {28, "nv", AVMEDIA_TYPE_VIDEO, CODEC_ID_NONE, 90000, -1},
  62. {31, "H261", AVMEDIA_TYPE_VIDEO, CODEC_ID_H261, 90000, -1},
  63. {32, "MPV", AVMEDIA_TYPE_VIDEO, CODEC_ID_MPEG1VIDEO, 90000, -1},
  64. {32, "MPV", AVMEDIA_TYPE_VIDEO, CODEC_ID_MPEG2VIDEO, 90000, -1},
  65. {33, "MP2T", AVMEDIA_TYPE_DATA, CODEC_ID_MPEG2TS, 90000, -1},
  66. {34, "H263", AVMEDIA_TYPE_VIDEO, CODEC_ID_H263, 90000, -1},
  67. {-1, "", AVMEDIA_TYPE_UNKNOWN, CODEC_ID_NONE, -1, -1}
  68. };
  69. int ff_rtp_get_codec_info(AVCodecContext *codec, int payload_type)
  70. {
  71. int i = 0;
  72. for (i = 0; AVRtpPayloadTypes[i].pt >= 0; i++)
  73. if (AVRtpPayloadTypes[i].pt == payload_type) {
  74. if (AVRtpPayloadTypes[i].codec_id != CODEC_ID_NONE) {
  75. codec->codec_type = AVRtpPayloadTypes[i].codec_type;
  76. codec->codec_id = AVRtpPayloadTypes[i].codec_id;
  77. if (AVRtpPayloadTypes[i].audio_channels > 0)
  78. codec->channels = AVRtpPayloadTypes[i].audio_channels;
  79. if (AVRtpPayloadTypes[i].clock_rate > 0)
  80. codec->sample_rate = AVRtpPayloadTypes[i].clock_rate;
  81. return 0;
  82. }
  83. }
  84. return -1;
  85. }
  86. int ff_rtp_get_payload_type(AVFormatContext *fmt, AVCodecContext *codec)
  87. {
  88. int i;
  89. AVOutputFormat *ofmt = fmt ? fmt->oformat : NULL;
  90. /* Was the payload type already specified for the RTP muxer? */
  91. if (ofmt && ofmt->priv_class) {
  92. int64_t payload_type;
  93. if (av_opt_get_int(fmt->priv_data, "payload_type", 0, &payload_type) >= 0 &&
  94. payload_type >= 0)
  95. return (int)payload_type;
  96. }
  97. /* static payload type */
  98. for (i = 0; AVRtpPayloadTypes[i].pt >= 0; ++i)
  99. if (AVRtpPayloadTypes[i].codec_id == codec->codec_id) {
  100. if (codec->codec_id == CODEC_ID_H263)
  101. continue;
  102. if (codec->codec_id == CODEC_ID_PCM_S16BE)
  103. if (codec->channels != AVRtpPayloadTypes[i].audio_channels)
  104. continue;
  105. return AVRtpPayloadTypes[i].pt;
  106. }
  107. /* dynamic payload type */
  108. return RTP_PT_PRIVATE + (codec->codec_type == AVMEDIA_TYPE_AUDIO);
  109. }
  110. const char *ff_rtp_enc_name(int payload_type)
  111. {
  112. int i;
  113. for (i = 0; AVRtpPayloadTypes[i].pt >= 0; i++)
  114. if (AVRtpPayloadTypes[i].pt == payload_type) {
  115. return AVRtpPayloadTypes[i].enc_name;
  116. }
  117. return "";
  118. }
  119. enum CodecID ff_rtp_codec_id(const char *buf, enum AVMediaType codec_type)
  120. {
  121. int i;
  122. for (i = 0; AVRtpPayloadTypes[i].pt >= 0; i++)
  123. if (!strcmp(buf, AVRtpPayloadTypes[i].enc_name) && (codec_type == AVRtpPayloadTypes[i].codec_type)){
  124. return AVRtpPayloadTypes[i].codec_id;
  125. }
  126. return CODEC_ID_NONE;
  127. }