| Line | Branch | Exec | Source |
|---|---|---|---|
| 1 | /* | ||
| 2 | * RTP packetization for Xiph audio and video | ||
| 3 | * Copyright (c) 2010 Josh Allmann | ||
| 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 "libavutil/avassert.h" | ||
| 23 | #include "libavutil/intreadwrite.h" | ||
| 24 | |||
| 25 | #include "avformat.h" | ||
| 26 | #include "rtpenc.h" | ||
| 27 | |||
| 28 | /** | ||
| 29 | * Packetize Xiph frames into RTP according to | ||
| 30 | * RFC 5215 (Vorbis) and the Theora RFC draft. | ||
| 31 | * (http://svn.xiph.org/trunk/theora/doc/draft-ietf-avt-rtp-theora-00.txt) | ||
| 32 | */ | ||
| 33 | ✗ | void ff_rtp_send_xiph(AVFormatContext *s1, const uint8_t *buff, int size) | |
| 34 | { | ||
| 35 | ✗ | RTPMuxContext *s = s1->priv_data; | |
| 36 | ✗ | AVStream *st = s1->streams[0]; | |
| 37 | int max_pkt_size, xdt, frag; | ||
| 38 | uint8_t *q; | ||
| 39 | |||
| 40 | ✗ | max_pkt_size = s->max_payload_size - 6; // ident+frag+tdt/vdt+pkt_num+pkt_length | |
| 41 | ✗ | if (max_pkt_size <= 0) { | |
| 42 | ✗ | av_log(s1, AV_LOG_ERROR, "Max payload size too small for Xiph RTP\n"); | |
| 43 | ✗ | return; | |
| 44 | } | ||
| 45 | |||
| 46 | // set xiph data type | ||
| 47 | ✗ | switch (*buff) { | |
| 48 | ✗ | case 0x01: // vorbis id | |
| 49 | case 0x05: // vorbis setup | ||
| 50 | case 0x80: // theora header | ||
| 51 | case 0x82: // theora tables | ||
| 52 | ✗ | xdt = 1; // packed config payload | |
| 53 | ✗ | break; | |
| 54 | ✗ | case 0x03: // vorbis comments | |
| 55 | case 0x81: // theora comments | ||
| 56 | ✗ | xdt = 2; // comment payload | |
| 57 | ✗ | break; | |
| 58 | ✗ | default: | |
| 59 | ✗ | xdt = 0; // raw data payload | |
| 60 | ✗ | break; | |
| 61 | } | ||
| 62 | |||
| 63 | // Set ident. | ||
| 64 | // Probably need a non-fixed way of generating | ||
| 65 | // this, but it has to be done in SDP and passed in from there. | ||
| 66 | ✗ | q = s->buf; | |
| 67 | ✗ | *q++ = (RTP_XIPH_IDENT >> 16) & 0xff; | |
| 68 | ✗ | *q++ = (RTP_XIPH_IDENT >> 8) & 0xff; | |
| 69 | ✗ | *q++ = (RTP_XIPH_IDENT ) & 0xff; | |
| 70 | |||
| 71 | // set fragment | ||
| 72 | // 0 - whole frame (possibly multiple frames) | ||
| 73 | // 1 - first fragment | ||
| 74 | // 2 - fragment continuation | ||
| 75 | // 3 - last fragment | ||
| 76 | ✗ | frag = size <= max_pkt_size ? 0 : 1; | |
| 77 | |||
| 78 | ✗ | if (!frag && !xdt) { // do we have a whole frame of raw data? | |
| 79 | ✗ | uint8_t *end_ptr = s->buf + 6 + max_pkt_size; // what we're allowed to write | |
| 80 | ✗ | uint8_t *ptr = s->buf_ptr + 2 + size; // what we're going to write | |
| 81 | ✗ | int remaining = end_ptr - ptr; | |
| 82 | |||
| 83 | av_assert1(s->num_frames <= s->max_frames_per_packet); | ||
| 84 | ✗ | if (s->num_frames > 0 && | |
| 85 | ✗ | (remaining < 0 || | |
| 86 | ✗ | s->num_frames == s->max_frames_per_packet || | |
| 87 | ✗ | av_compare_ts(s->cur_timestamp - s->timestamp, st->time_base, | |
| 88 | ✗ | s1->max_delay, AV_TIME_BASE_Q) >= 0)) { | |
| 89 | // send previous packets now; no room for new data, or too much delay | ||
| 90 | ✗ | ff_rtp_send_data(s1, s->buf, s->buf_ptr - s->buf, 0); | |
| 91 | ✗ | s->num_frames = 0; | |
| 92 | } | ||
| 93 | |||
| 94 | // buffer current frame to send later | ||
| 95 | ✗ | if (0 == s->num_frames) | |
| 96 | ✗ | s->timestamp = s->cur_timestamp; | |
| 97 | ✗ | s->num_frames++; | |
| 98 | |||
| 99 | // Set packet header. Normally, this is OR'd with frag and xdt, | ||
| 100 | // but those are zero, so omitted here | ||
| 101 | ✗ | *q++ = s->num_frames; | |
| 102 | |||
| 103 | ✗ | if (s->num_frames > 1) | |
| 104 | ✗ | q = s->buf_ptr; // jump ahead if needed | |
| 105 | ✗ | AV_WB16(q, size); | |
| 106 | ✗ | q += 2; | |
| 107 | ✗ | memcpy(q, buff, size); | |
| 108 | ✗ | q += size; | |
| 109 | ✗ | s->buf_ptr = q; | |
| 110 | |||
| 111 | ✗ | return; | |
| 112 | ✗ | } else if (s->num_frames) { | |
| 113 | // immediately send buffered frames if buffer is not raw data, | ||
| 114 | // or if current frame is fragmented. | ||
| 115 | ✗ | ff_rtp_send_data(s1, s->buf, s->buf_ptr - s->buf, 0); | |
| 116 | } | ||
| 117 | |||
| 118 | ✗ | s->timestamp = s->cur_timestamp; | |
| 119 | ✗ | s->num_frames = 0; | |
| 120 | ✗ | s->buf_ptr = q; | |
| 121 | ✗ | while (size > 0) { | |
| 122 | ✗ | int len = (!frag || frag == 3) ? size : max_pkt_size; | |
| 123 | ✗ | q = s->buf_ptr; | |
| 124 | |||
| 125 | // set packet headers | ||
| 126 | ✗ | *q++ = (frag << 6) | (xdt << 4); // num_frames = 0 | |
| 127 | ✗ | AV_WB16(q, len); | |
| 128 | ✗ | q += 2; | |
| 129 | // set packet body | ||
| 130 | ✗ | memcpy(q, buff, len); | |
| 131 | ✗ | q += len; | |
| 132 | ✗ | buff += len; | |
| 133 | ✗ | size -= len; | |
| 134 | |||
| 135 | ✗ | ff_rtp_send_data(s1, s->buf, q - s->buf, 0); | |
| 136 | |||
| 137 | ✗ | frag = size <= max_pkt_size ? 3 : 2; | |
| 138 | } | ||
| 139 | } | ||
| 140 |