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
|
/* -*- Mode: C; c-basic-offset: 4; indent-tabs-mode: nil -*- */
/*
Copyright (C) 2010 Red Hat, Inc.
This library 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.
This library 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 this library; if not, see <http://www.gnu.org/licenses/>.
*/
#include "config.h"
#include "spice-client.h"
#include "spice-common.h"
#include "spice-channel-priv.h"
#include "channel-display-priv.h"
static void mjpeg_src_init(struct jpeg_decompress_struct *cinfo)
{
display_stream *st = SPICE_CONTAINEROF(cinfo->src, display_stream, mjpeg_src);
uint8_t *data;
cinfo->src->bytes_in_buffer = stream_get_current_frame(st, &data);
cinfo->src->next_input_byte = data;
}
static boolean mjpeg_src_fill(struct jpeg_decompress_struct *cinfo)
{
g_critical("need more input data");
return 0;
}
static void mjpeg_src_skip(struct jpeg_decompress_struct *cinfo,
long num_bytes)
{
cinfo->src->next_input_byte += num_bytes;
}
static void mjpeg_src_term(struct jpeg_decompress_struct *cinfo)
{
/* nothing */
}
G_GNUC_INTERNAL
void stream_mjpeg_init(display_stream *st)
{
st->mjpeg_cinfo.err = jpeg_std_error(&st->mjpeg_jerr);
jpeg_create_decompress(&st->mjpeg_cinfo);
st->mjpeg_src.init_source = mjpeg_src_init;
st->mjpeg_src.fill_input_buffer = mjpeg_src_fill;
st->mjpeg_src.skip_input_data = mjpeg_src_skip;
st->mjpeg_src.resync_to_restart = jpeg_resync_to_restart;
st->mjpeg_src.term_source = mjpeg_src_term;
st->mjpeg_cinfo.src = &st->mjpeg_src;
}
G_GNUC_INTERNAL
void stream_mjpeg_data(display_stream *st)
{
gboolean back_compat = st->channel->priv->peer_hdr.major_version == 1;
int width;
int height;
uint8_t *dest;
uint8_t *lines[4];
stream_get_dimensions(st, &width, &height);
dest = g_malloc0(width * height * 4);
g_free(st->out_frame);
st->out_frame = dest;
jpeg_read_header(&st->mjpeg_cinfo, 1);
#ifdef JCS_EXTENSIONS
// requires jpeg-turbo
if (back_compat)
st->mjpeg_cinfo.out_color_space = JCS_EXT_RGBX;
else
st->mjpeg_cinfo.out_color_space = JCS_EXT_BGRX;
#else
#warning "You should consider building with libjpeg-turbo"
st->mjpeg_cinfo.out_color_space = JCS_RGB;
#endif
#ifndef SPICE_QUALITY
st->mjpeg_cinfo.dct_method = JDCT_IFAST;
st->mjpeg_cinfo.do_fancy_upsampling = FALSE;
st->mjpeg_cinfo.do_block_smoothing = FALSE;
st->mjpeg_cinfo.dither_mode = JDITHER_ORDERED;
#endif
// TODO: in theory should check cinfo.output_height match with our height
jpeg_start_decompress(&st->mjpeg_cinfo);
/* rec_outbuf_height is the recommended size of the output buffer we
* pass to libjpeg for optimum performance
*/
if (st->mjpeg_cinfo.rec_outbuf_height > G_N_ELEMENTS(lines)) {
jpeg_abort_decompress(&st->mjpeg_cinfo);
g_return_if_reached();
}
while (st->mjpeg_cinfo.output_scanline < st->mjpeg_cinfo.output_height) {
/* only used when JCS_EXTENSIONS is undefined */
G_GNUC_UNUSED unsigned int lines_read;
for (unsigned int j = 0; j < st->mjpeg_cinfo.rec_outbuf_height; j++) {
lines[j] = dest;
#ifdef JCS_EXTENSIONS
dest += 4 * width;
#else
dest += 3 * width;
#endif
}
lines_read = jpeg_read_scanlines(&st->mjpeg_cinfo, lines,
st->mjpeg_cinfo.rec_outbuf_height);
#ifndef JCS_EXTENSIONS
{
uint8_t *s = lines[0];
uint32_t *d = (uint32_t *)s;
if (back_compat) {
for (unsigned int j = lines_read * width; j > 0; ) {
j -= 1; // reverse order, bad for cache?
d[j] = s[j * 3 + 0] |
s[j * 3 + 1] << 8 |
s[j * 3 + 2] << 16;
}
} else {
for (unsigned int j = lines_read * width; j > 0; ) {
j -= 1; // reverse order, bad for cache?
d[j] = s[j * 3 + 0] << 16 |
s[j * 3 + 1] << 8 |
s[j * 3 + 2];
}
}
}
#endif
dest = &st->out_frame[st->mjpeg_cinfo.output_scanline * width * 4];
}
jpeg_finish_decompress(&st->mjpeg_cinfo);
}
G_GNUC_INTERNAL
void stream_mjpeg_cleanup(display_stream *st)
{
jpeg_destroy_decompress(&st->mjpeg_cinfo);
g_free(st->out_frame);
st->out_frame = NULL;
}
|
