/
rtpenc_jpeg.c
227 lines (207 loc) · 7.81 KB
/
rtpenc_jpeg.c
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
/*
* RTP JPEG-compressed video Packetizer, RFC 2435
* Copyright (c) 2012 Samuel Pitoiset
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "libavcodec/bytestream.h"
#include "libavcodec/mjpeg.h"
#include "libavcodec/jpegtables.h"
#include "libavutil/intreadwrite.h"
#include "rtpenc.h"
void ff_rtp_send_jpeg(AVFormatContext *s1, const uint8_t *buf, int size)
{
RTPMuxContext *s = s1->priv_data;
const uint8_t *qtables[4] = { NULL };
int nb_qtables = 0;
uint8_t type;
uint8_t w, h;
uint8_t *p;
int off = 0; /* fragment offset of the current JPEG frame */
int len;
int i;
int default_huffman_tables = 0;
s->buf_ptr = s->buf;
s->timestamp = s->cur_timestamp;
/* convert video pixel dimensions from pixels to blocks */
w = AV_CEIL_RSHIFT(s1->streams[0]->codecpar->width, 3);
h = AV_CEIL_RSHIFT(s1->streams[0]->codecpar->height, 3);
/* get the pixel format type or fail */
if (s1->streams[0]->codecpar->format == AV_PIX_FMT_YUVJ422P ||
(s1->streams[0]->codecpar->color_range == AVCOL_RANGE_JPEG &&
s1->streams[0]->codecpar->format == AV_PIX_FMT_YUV422P)) {
type = 0;
} else if (s1->streams[0]->codecpar->format == AV_PIX_FMT_YUVJ420P ||
(s1->streams[0]->codecpar->color_range == AVCOL_RANGE_JPEG &&
s1->streams[0]->codecpar->format == AV_PIX_FMT_YUV420P)) {
type = 1;
} else {
av_log(s1, AV_LOG_ERROR, "Unsupported pixel format\n");
return;
}
/* preparse the header for getting some info */
for (i = 0; i < size; i++) {
if (buf[i] != 0xff)
continue;
if (buf[i + 1] == DQT) {
int tables, j;
if (buf[i + 4] & 0xF0)
av_log(s1, AV_LOG_WARNING,
"Only 8-bit precision is supported.\n");
/* a quantization table is 64 bytes long */
tables = AV_RB16(&buf[i + 2]) / 65;
if (i + 5 + tables * 65 > size) {
av_log(s1, AV_LOG_ERROR, "Too short JPEG header. Aborted!\n");
return;
}
if (nb_qtables + tables > 4) {
av_log(s1, AV_LOG_ERROR, "Invalid number of quantisation tables\n");
return;
}
for (j = 0; j < tables; j++)
qtables[nb_qtables + j] = buf + i + 5 + j * 65;
nb_qtables += tables;
} else if (buf[i + 1] == SOF0) {
if (buf[i + 14] != 17 || buf[i + 17] != 17) {
av_log(s1, AV_LOG_ERROR,
"Only 1x1 chroma blocks are supported. Aborted!\n");
return;
}
} else if (buf[i + 1] == DHT) {
int dht_size = AV_RB16(&buf[i + 2]);
default_huffman_tables |= 1 << 4;
i += 3;
dht_size -= 2;
if (i + dht_size >= size)
continue;
while (dht_size > 0)
switch (buf[i + 1]) {
case 0x00:
if ( dht_size >= 29
&& !memcmp(buf + i + 2, ff_mjpeg_bits_dc_luminance + 1, 16)
&& !memcmp(buf + i + 18, ff_mjpeg_val_dc, 12)) {
default_huffman_tables |= 1;
i += 29;
dht_size -= 29;
} else {
i += dht_size;
dht_size = 0;
}
break;
case 0x01:
if ( dht_size >= 29
&& !memcmp(buf + i + 2, ff_mjpeg_bits_dc_chrominance + 1, 16)
&& !memcmp(buf + i + 18, ff_mjpeg_val_dc, 12)) {
default_huffman_tables |= 1 << 1;
i += 29;
dht_size -= 29;
} else {
i += dht_size;
dht_size = 0;
}
break;
case 0x10:
if ( dht_size >= 179
&& !memcmp(buf + i + 2, ff_mjpeg_bits_ac_luminance + 1, 16)
&& !memcmp(buf + i + 18, ff_mjpeg_val_ac_luminance, 162)) {
default_huffman_tables |= 1 << 2;
i += 179;
dht_size -= 179;
} else {
i += dht_size;
dht_size = 0;
}
break;
case 0x11:
if ( dht_size >= 179
&& !memcmp(buf + i + 2, ff_mjpeg_bits_ac_chrominance + 1, 16)
&& !memcmp(buf + i + 18, ff_mjpeg_val_ac_chrominance, 162)) {
default_huffman_tables |= 1 << 3;
i += 179;
dht_size -= 179;
} else {
i += dht_size;
dht_size = 0;
}
break;
default:
i += dht_size;
dht_size = 0;
continue;
}
} else if (buf[i + 1] == SOS) {
/* SOS is last marker in the header */
i += AV_RB16(&buf[i + 2]) + 2;
if (i > size) {
av_log(s1, AV_LOG_ERROR,
"Insufficient data. Aborted!\n");
return;
}
break;
}
}
if (default_huffman_tables && default_huffman_tables != 31) {
av_log(s1, AV_LOG_ERROR,
"RFC 2435 requires standard Huffman tables for jpeg\n");
return;
}
if (nb_qtables && nb_qtables != 2)
av_log(s1, AV_LOG_WARNING,
"RFC 2435 suggests two quantization tables, %d provided\n",
nb_qtables);
/* skip JPEG header */
buf += i;
size -= i;
for (i = size - 2; i >= 0; i--) {
if (buf[i] == 0xff && buf[i + 1] == EOI) {
/* Remove the EOI marker */
size = i;
break;
}
}
p = s->buf_ptr;
while (size > 0) {
int hdr_size = 8;
if (off == 0 && nb_qtables)
hdr_size += 4 + 64 * nb_qtables;
/* payload max in one packet */
len = FFMIN(size, s->max_payload_size - hdr_size);
/* set main header */
bytestream_put_byte(&p, 0);
bytestream_put_be24(&p, off);
bytestream_put_byte(&p, type);
bytestream_put_byte(&p, 255);
bytestream_put_byte(&p, w);
bytestream_put_byte(&p, h);
if (off == 0 && nb_qtables) {
/* set quantization tables header */
bytestream_put_byte(&p, 0);
bytestream_put_byte(&p, 0);
bytestream_put_be16(&p, 64 * nb_qtables);
for (i = 0; i < nb_qtables; i++)
bytestream_put_buffer(&p, qtables[i], 64);
}
/* copy payload data */
memcpy(p, buf, len);
/* marker bit is last packet in frame */
ff_rtp_send_data(s1, s->buf, len + hdr_size, size == len);
buf += len;
size -= len;
off += len;
p = s->buf;
}
}