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1 | /* |
2 | * RTP JPEG-compressed video Packetizer, RFC 2435 | |
3 | * Copyright (c) 2012 Samuel Pitoiset | |
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 "libavcodec/bytestream.h" | |
23 | #include "libavcodec/mjpeg.h" | |
24 | #include "libavutil/intreadwrite.h" | |
25 | #include "rtpenc.h" | |
26 | ||
27 | void ff_rtp_send_jpeg(AVFormatContext *s1, const uint8_t *buf, int size) | |
28 | { | |
29 | RTPMuxContext *s = s1->priv_data; | |
30 | const uint8_t *qtables = NULL; | |
31 | int nb_qtables = 0; | |
32 | uint8_t type; | |
33 | uint8_t w, h; | |
34 | uint8_t *p; | |
35 | int off = 0; /* fragment offset of the current JPEG frame */ | |
36 | int len; | |
37 | int i; | |
38 | ||
39 | s->buf_ptr = s->buf; | |
40 | s->timestamp = s->cur_timestamp; | |
41 | ||
42 | /* convert video pixel dimensions from pixels to blocks */ | |
43 | w = s1->streams[0]->codec->width >> 3; | |
44 | h = s1->streams[0]->codec->height >> 3; | |
45 | ||
46 | /* get the pixel format type or fail */ | |
47 | if (s1->streams[0]->codec->pix_fmt == AV_PIX_FMT_YUVJ422P || | |
48 | (s1->streams[0]->codec->color_range == AVCOL_RANGE_JPEG && | |
49 | s1->streams[0]->codec->pix_fmt == AV_PIX_FMT_YUV422P)) { | |
50 | type = 0; | |
51 | } else if (s1->streams[0]->codec->pix_fmt == AV_PIX_FMT_YUVJ420P || | |
52 | (s1->streams[0]->codec->color_range == AVCOL_RANGE_JPEG && | |
53 | s1->streams[0]->codec->pix_fmt == AV_PIX_FMT_YUV420P)) { | |
54 | type = 1; | |
55 | } else { | |
56 | av_log(s1, AV_LOG_ERROR, "Unsupported pixel format\n"); | |
57 | return; | |
58 | } | |
59 | ||
60 | /* preparse the header for getting some infos */ | |
61 | for (i = 0; i < size; i++) { | |
62 | if (buf[i] != 0xff) | |
63 | continue; | |
64 | ||
65 | if (buf[i + 1] == DQT) { | |
66 | if (buf[i + 4]) | |
67 | av_log(s1, AV_LOG_WARNING, | |
68 | "Only 8-bit precision is supported.\n"); | |
69 | ||
70 | /* a quantization table is 64 bytes long */ | |
71 | nb_qtables = AV_RB16(&buf[i + 2]) / 65; | |
72 | if (i + 4 + nb_qtables * 65 > size) { | |
73 | av_log(s1, AV_LOG_ERROR, "Too short JPEG header. Aborted!\n"); | |
74 | return; | |
75 | } | |
76 | ||
77 | qtables = &buf[i + 4]; | |
78 | } else if (buf[i + 1] == SOF0) { | |
79 | if (buf[i + 14] != 17 || buf[i + 17] != 17) { | |
80 | av_log(s1, AV_LOG_ERROR, | |
81 | "Only 1x1 chroma blocks are supported. Aborted!\n"); | |
82 | return; | |
83 | } | |
84 | } else if (buf[i + 1] == SOS) { | |
85 | /* SOS is last marker in the header */ | |
86 | i += AV_RB16(&buf[i + 2]) + 2; | |
87 | break; | |
88 | } | |
89 | } | |
90 | ||
91 | /* skip JPEG header */ | |
92 | buf += i; | |
93 | size -= i; | |
94 | ||
95 | for (i = size - 2; i >= 0; i--) { | |
96 | if (buf[i] == 0xff && buf[i + 1] == EOI) { | |
97 | /* Remove the EOI marker */ | |
98 | size = i; | |
99 | break; | |
100 | } | |
101 | } | |
102 | ||
103 | p = s->buf_ptr; | |
104 | while (size > 0) { | |
105 | int hdr_size = 8; | |
106 | ||
107 | if (off == 0 && nb_qtables) | |
108 | hdr_size += 4 + 64 * nb_qtables; | |
109 | ||
110 | /* payload max in one packet */ | |
111 | len = FFMIN(size, s->max_payload_size - hdr_size); | |
112 | ||
113 | /* set main header */ | |
114 | bytestream_put_byte(&p, 0); | |
115 | bytestream_put_be24(&p, off); | |
116 | bytestream_put_byte(&p, type); | |
117 | bytestream_put_byte(&p, 255); | |
118 | bytestream_put_byte(&p, w); | |
119 | bytestream_put_byte(&p, h); | |
120 | ||
121 | if (off == 0 && nb_qtables) { | |
122 | /* set quantization tables header */ | |
123 | bytestream_put_byte(&p, 0); | |
124 | bytestream_put_byte(&p, 0); | |
125 | bytestream_put_be16(&p, 64 * nb_qtables); | |
126 | ||
127 | for (i = 0; i < nb_qtables; i++) | |
128 | bytestream_put_buffer(&p, &qtables[65 * i + 1], 64); | |
129 | } | |
130 | ||
131 | /* copy payload data */ | |
132 | memcpy(p, buf, len); | |
133 | ||
134 | /* marker bit is last packet in frame */ | |
135 | ff_rtp_send_data(s1, s->buf, len + hdr_size, size == len); | |
136 | ||
137 | buf += len; | |
138 | size -= len; | |
139 | off += len; | |
140 | p = s->buf; | |
141 | } | |
142 | } |