avformat: Remove non-compiling and/or silly commented-out printf/av_log statements
[libav.git] / libavformat / rtpenc_xiph.c
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1/*
2 * RTP packetization for Xiph audio and video
3 * Copyright (c) 2010 Josh Allmann
4 *
2912e87a 5 * This file is part of Libav.
91af5601 6 *
2912e87a 7 * Libav is free software; you can redistribute it and/or
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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 *
2912e87a 12 * Libav is distributed in the hope that it will be useful,
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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
2912e87a 18 * License along with Libav; if not, write to the Free Software
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19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
22#include "avformat.h"
23#include "rtpenc.h"
24
25/**
26 * Packetize Xiph frames into RTP according to
27 * RFC 5215 (Vorbis) and the Theora RFC draft.
28 * (http://svn.xiph.org/trunk/theora/doc/draft-ietf-avt-rtp-theora-00.txt)
29 */
30void ff_rtp_send_xiph(AVFormatContext *s1, const uint8_t *buff, int size)
31{
32 RTPMuxContext *s = s1->priv_data;
33 int max_pkt_size, xdt, frag;
34 uint8_t *q;
35
36 max_pkt_size = s->max_payload_size;
37
38 // set xiph data type
39 switch (*buff) {
40 case 0x01: // vorbis id
41 case 0x05: // vorbis setup
42 case 0x80: // theora header
43 case 0x82: // theora tables
44 xdt = 1; // packed config payload
45 break;
46 case 0x03: // vorbis comments
47 case 0x81: // theora comments
48 xdt = 2; // comment payload
49 break;
50 default:
51 xdt = 0; // raw data payload
52 break;
53 }
54
b5c4bb98 55 // Set ident.
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56 // Probably need a non-fixed way of generating
57 // this, but it has to be done in SDP and passed in from there.
58 q = s->buf;
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59 *q++ = (RTP_XIPH_IDENT >> 16) & 0xff;
60 *q++ = (RTP_XIPH_IDENT >> 8) & 0xff;
61 *q++ = (RTP_XIPH_IDENT ) & 0xff;
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62
63 // set fragment
64 // 0 - whole frame (possibly multiple frames)
65 // 1 - first fragment
66 // 2 - fragment continuation
67 // 3 - last fragmement
68 frag = size <= max_pkt_size ? 0 : 1;
69
70 if (!frag && !xdt) { // do we have a whole frame of raw data?
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71 uint8_t *end_ptr = s->buf + 6 + max_pkt_size; // what we're allowed to write
72 uint8_t *ptr = s->buf_ptr + 2 + size; // what we're going to write
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73 int remaining = end_ptr - ptr;
74
f53b9a29 75 assert(s->num_frames <= s->max_frames_per_packet);
91af5601 76 if ((s->num_frames > 0 && remaining < 0) ||
f53b9a29 77 s->num_frames == s->max_frames_per_packet) {
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78 // send previous packets now; no room for new data
79 ff_rtp_send_data(s1, s->buf, s->buf_ptr - s->buf, 0);
80 s->num_frames = 0;
81 }
82
83 // buffer current frame to send later
84 if (0 == s->num_frames) s->timestamp = s->cur_timestamp;
85 s->num_frames++;
86
87 // Set packet header. Normally, this is OR'd with frag and xdt,
88 // but those are zero, so omitted here
89 *q++ = s->num_frames;
90
91 if (s->num_frames > 1) q = s->buf_ptr; // jump ahead if needed
92 *q++ = (size >> 8) & 0xff;
93 *q++ = size & 0xff;
94 memcpy(q, buff, size);
95 q += size;
96 s->buf_ptr = q;
97
98 return;
99 } else if (s->num_frames) {
100 // immediately send buffered frames if buffer is not raw data,
101 // or if current frame is fragmented.
102 ff_rtp_send_data(s1, s->buf, s->buf_ptr - s->buf, 0);
103 }
104
105 s->timestamp = s->cur_timestamp;
106 s->num_frames = 0;
107 s->buf_ptr = q;
108 while (size > 0) {
109 int len = (!frag || frag == 3) ? size : max_pkt_size;
110 q = s->buf_ptr;
111
112 // set packet headers
113 *q++ = (frag << 6) | (xdt << 4); // num_frames = 0
114 *q++ = (len >> 8) & 0xff;
115 *q++ = len & 0xff;
116 // set packet body
117 memcpy(q, buff, len);
118 q += len;
119 buff += len;
120 size -= len;
121
122 ff_rtp_send_data(s1, s->buf, q - s->buf, 0);
123
124 frag = size <= max_pkt_size ? 3 : 2;
125 }
126}