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
|
/* -*- Mode: C; c-basic-offset: 4; indent-tabs-mode: nil -*- */
/*
Copyright (C) 2009 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/>.
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include "red_common.h"
#include "mjpeg_encoder.h"
#include <jerror.h>
#include <jpeglib.h>
struct MJpegEncoder {
int width;
int height;
int stride;
uint8_t *frame;
int first_frame;
int quality;
struct jpeg_compress_struct cinfo;
struct jpeg_error_mgr jerr;
};
MJpegEncoder *mjpeg_encoder_new(int width, int height)
{
MJpegEncoder *enc;
enc = spice_new0(MJpegEncoder, 1);
enc->first_frame = TRUE;
enc->width = width;
enc->height = height;
enc->stride = width * 3;
enc->quality = 70;
if (enc->stride < width) {
abort();
}
enc->frame = spice_malloc_n(enc->stride, height);
enc->cinfo.err = jpeg_std_error(&enc->jerr);
jpeg_create_compress(&enc->cinfo);
return enc;
}
void mjpeg_encoder_destroy(MJpegEncoder *encoder)
{
jpeg_destroy_compress(&encoder->cinfo);
free(encoder->frame);
free(encoder);
}
uint8_t *mjpeg_encoder_get_frame(MJpegEncoder *encoder)
{
return encoder->frame;
}
size_t mjpeg_encoder_get_frame_stride(MJpegEncoder *encoder)
{
return encoder->stride;
}
/* code from libjpeg 8 to handle compression to a memory buffer
*
* Copyright (C) 1994-1996, Thomas G. Lane.
* Modified 2009 by Guido Vollbeding.
* This file is part of the Independent JPEG Group's software.
*/
typedef struct {
struct jpeg_destination_mgr pub; /* public fields */
unsigned char ** outbuffer; /* target buffer */
unsigned long * outsize;
unsigned char * newbuffer; /* newly allocated buffer */
uint8_t * buffer; /* start of buffer */
size_t bufsize;
} mem_destination_mgr;
static void init_mem_destination(j_compress_ptr cinfo)
{
}
static boolean empty_mem_output_buffer(j_compress_ptr cinfo)
{
size_t nextsize;
uint8_t * nextbuffer;
mem_destination_mgr *dest = (mem_destination_mgr *) cinfo->dest;
/* Try to allocate new buffer with double size */
nextsize = dest->bufsize * 2;
nextbuffer = malloc(nextsize);
if (nextbuffer == NULL)
ERREXIT1(cinfo, JERR_OUT_OF_MEMORY, 10);
memcpy(nextbuffer, dest->buffer, dest->bufsize);
if (dest->newbuffer != NULL)
free(dest->newbuffer);
dest->newbuffer = nextbuffer;
dest->pub.next_output_byte = nextbuffer + dest->bufsize;
dest->pub.free_in_buffer = dest->bufsize;
dest->buffer = nextbuffer;
dest->bufsize = nextsize;
return TRUE;
}
static void term_mem_destination(j_compress_ptr cinfo)
{
mem_destination_mgr *dest = (mem_destination_mgr *) cinfo->dest;
*dest->outbuffer = dest->buffer;
*dest->outsize = dest->bufsize - dest->pub.free_in_buffer;
}
/*
* Prepare for output to a memory buffer.
* The caller may supply an own initial buffer with appropriate size.
* Otherwise, or when the actual data output exceeds the given size,
* the library adapts the buffer size as necessary.
* The standard library functions malloc/free are used for allocating
* larger memory, so the buffer is available to the application after
* finishing compression, and then the application is responsible for
* freeing the requested memory.
*/
static void
jpeg_mem_dest (j_compress_ptr cinfo,
unsigned char ** outbuffer, unsigned long * outsize)
{
mem_destination_mgr *dest;
#define OUTPUT_BUF_SIZE 4096 /* choose an efficiently fwrite'able size */
if (outbuffer == NULL || outsize == NULL) /* sanity check */
ERREXIT(cinfo, JERR_BUFFER_SIZE);
/* The destination object is made permanent so that multiple JPEG images
* can be written to the same buffer without re-executing jpeg_mem_dest.
*/
if (cinfo->dest == NULL) { /* first time for this JPEG object? */
cinfo->dest = spice_malloc(sizeof(mem_destination_mgr));
}
dest = (mem_destination_mgr *) cinfo->dest;
dest->pub.init_destination = init_mem_destination;
dest->pub.empty_output_buffer = empty_mem_output_buffer;
dest->pub.term_destination = term_mem_destination;
dest->outbuffer = outbuffer;
dest->outsize = outsize;
dest->newbuffer = NULL;
if (*outbuffer == NULL || *outsize == 0) {
/* Allocate initial buffer */
dest->newbuffer = *outbuffer = malloc(OUTPUT_BUF_SIZE);
if (dest->newbuffer == NULL)
ERREXIT1(cinfo, JERR_OUT_OF_MEMORY, 10);
*outsize = OUTPUT_BUF_SIZE;
}
dest->pub.next_output_byte = dest->buffer = *outbuffer;
dest->pub.free_in_buffer = dest->bufsize = *outsize;
}
/* end of code from libjpeg */
int mjpeg_encoder_encode_frame(MJpegEncoder *encoder,
uint8_t **buffer, size_t *buffer_len)
{
uint8_t *frame;
int n;
jpeg_mem_dest(&encoder->cinfo, buffer, buffer_len);
encoder->cinfo.image_width = encoder->width;
encoder->cinfo.image_height = encoder->height;
encoder->cinfo.input_components = 3;
encoder->cinfo.in_color_space = JCS_RGB;
jpeg_set_defaults(&encoder->cinfo);
encoder->cinfo.dct_method = JDCT_IFAST;
jpeg_set_quality(&encoder->cinfo, encoder->quality, TRUE);
jpeg_start_compress(&encoder->cinfo, encoder->first_frame);
frame = encoder->frame;
while (encoder->cinfo.next_scanline < encoder->cinfo.image_height) {
n = jpeg_write_scanlines(&encoder->cinfo, &frame, 1);
if (n == 0) { /* Not enough space */
jpeg_abort_compress(&encoder->cinfo);
return 0;
}
frame += encoder->stride;
}
jpeg_finish_compress(&encoder->cinfo);
encoder->first_frame = FALSE;
return encoder->cinfo.dest->next_output_byte - *buffer;
}
|
