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2ba45a60 DM |
1 | /* |
2 | * RTP packetization for MPEG video | |
3 | * Copyright (c) 2002 Fabrice Bellard | |
4 | * Copyright (c) 2007 Luca Abeni | |
5 | * | |
6 | * This file is part of FFmpeg. | |
7 | * | |
8 | * FFmpeg is free software; you can redistribute it and/or | |
9 | * modify it under the terms of the GNU Lesser General Public | |
10 | * License as published by the Free Software Foundation; either | |
11 | * version 2.1 of the License, or (at your option) any later version. | |
12 | * | |
13 | * FFmpeg is distributed in the hope that it will be useful, | |
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
16 | * Lesser General Public License for more details. | |
17 | * | |
18 | * You should have received a copy of the GNU Lesser General Public | |
19 | * License along with FFmpeg; if not, write to the Free Software | |
20 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
21 | */ | |
22 | ||
23 | #include "libavcodec/internal.h" | |
24 | #include "avformat.h" | |
25 | #include "rtpenc.h" | |
26 | ||
27 | /* NOTE: a single frame must be passed with sequence header if | |
28 | needed. XXX: use slices. */ | |
29 | void ff_rtp_send_mpegvideo(AVFormatContext *s1, const uint8_t *buf1, int size) | |
30 | { | |
31 | RTPMuxContext *s = s1->priv_data; | |
32 | int len, h, max_packet_size; | |
33 | uint8_t *q; | |
34 | const uint8_t *end = buf1 + size; | |
35 | int begin_of_slice, end_of_slice, frame_type, temporal_reference; | |
36 | ||
37 | max_packet_size = s->max_payload_size; | |
38 | begin_of_slice = 1; | |
39 | end_of_slice = 0; | |
40 | frame_type = 0; | |
41 | temporal_reference = 0; | |
42 | ||
43 | while (size > 0) { | |
44 | int begin_of_sequence; | |
45 | ||
46 | begin_of_sequence = 0; | |
47 | len = max_packet_size - 4; | |
48 | ||
49 | if (len >= size) { | |
50 | len = size; | |
51 | end_of_slice = 1; | |
52 | } else { | |
53 | const uint8_t *r, *r1; | |
54 | int start_code; | |
55 | ||
56 | r1 = buf1; | |
57 | while (1) { | |
58 | start_code = -1; | |
59 | r = avpriv_find_start_code(r1, end, &start_code); | |
60 | if((start_code & 0xFFFFFF00) == 0x100) { | |
61 | /* New start code found */ | |
62 | if (start_code == 0x100) { | |
63 | frame_type = (r[1] & 0x38) >> 3; | |
64 | temporal_reference = (int)r[0] << 2 | r[1] >> 6; | |
65 | } | |
66 | if (start_code == 0x1B8) { | |
67 | begin_of_sequence = 1; | |
68 | } | |
69 | ||
70 | if (r - buf1 - 4 <= len) { | |
71 | /* The current slice fits in the packet */ | |
72 | if (begin_of_slice == 0) { | |
73 | /* no slice at the beginning of the packet... */ | |
74 | end_of_slice = 1; | |
75 | len = r - buf1 - 4; | |
76 | break; | |
77 | } | |
78 | r1 = r; | |
79 | } else { | |
80 | if ((r1 - buf1 > 4) && (r - r1 < max_packet_size)) { | |
81 | len = r1 - buf1 - 4; | |
82 | end_of_slice = 1; | |
83 | } | |
84 | break; | |
85 | } | |
86 | } else { | |
87 | break; | |
88 | } | |
89 | } | |
90 | } | |
91 | ||
92 | h = 0; | |
93 | h |= temporal_reference << 16; | |
94 | h |= begin_of_sequence << 13; | |
95 | h |= begin_of_slice << 12; | |
96 | h |= end_of_slice << 11; | |
97 | h |= frame_type << 8; | |
98 | ||
99 | q = s->buf; | |
100 | *q++ = h >> 24; | |
101 | *q++ = h >> 16; | |
102 | *q++ = h >> 8; | |
103 | *q++ = h; | |
104 | ||
105 | memcpy(q, buf1, len); | |
106 | q += len; | |
107 | ||
108 | /* 90kHz time stamp */ | |
109 | s->timestamp = s->cur_timestamp; | |
110 | ff_rtp_send_data(s1, s->buf, q - s->buf, (len == size)); | |
111 | ||
112 | buf1 += len; | |
113 | size -= len; | |
114 | begin_of_slice = end_of_slice; | |
115 | end_of_slice = 0; | |
116 | } | |
117 | } |