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
|
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "config.h"
#include "mp_msg.h"
#include <jpeglib.h>
#define UINT16 IJPG_UINT16
#define INT16 IJPG_INT16
#include <setjmp.h>
#include "libavutil/common.h"
#include "mpbswap.h"
#include "vd_internal.h"
static vd_info_t info = {
"JPEG Images decoder",
"ijpg",
"Pontscho",
"based on vd_mpng.c",
"uses Independent JPEG Group's jpeglib"
};
LIBVD_EXTERN(ijpg)
static int last_w=-1;
static int last_h=-1;
// to set/get/query special features/parameters
static int control(sh_video_t *sh,int cmd,void* arg,...){
return CONTROL_UNKNOWN;
}
// init driver
static int init(sh_video_t *sh){
last_w=-1;
return 1;
}
// uninit driver
static void uninit(sh_video_t *sh){
}
//mp_image_t* mpcodecs_get_image(sh_video_t *sh, int mp_imgtype, int mp_imgflag, int w, int h);
typedef struct
{
struct jpeg_source_mgr pub;
unsigned char * inbuf;
int bufsize;
} my_source_mgr;
typedef my_source_mgr * my_src_ptr;
METHODDEF(void) init_source (j_decompress_ptr cinfo)
{
}
METHODDEF(boolean) fill_input_buffer (j_decompress_ptr cinfo)
{
my_src_ptr src = (my_src_ptr) cinfo->src;
src->pub.next_input_byte = src->inbuf;
src->pub.bytes_in_buffer = src->bufsize;
return TRUE;
}
METHODDEF(void) skip_input_data (j_decompress_ptr cinfo, long num_bytes)
{
my_src_ptr src = (my_src_ptr) cinfo->src;
if (num_bytes > 0)
{
while (num_bytes > (long) src->pub.bytes_in_buffer)
{
num_bytes -= (long) src->pub.bytes_in_buffer;
(void) fill_input_buffer(cinfo);
}
src->pub.next_input_byte += (size_t) num_bytes;
src->pub.bytes_in_buffer -= (size_t) num_bytes;
}
}
METHODDEF(void) term_source (j_decompress_ptr cinfo) { }
GLOBAL(void) jpeg_buf_src ( j_decompress_ptr cinfo, char * inbuf,int bufsize )
{
my_src_ptr src;
if (cinfo->src == NULL) cinfo->src=malloc( sizeof( my_source_mgr ) );
src = (my_src_ptr) cinfo->src;
src->pub.init_source = init_source;
src->pub.fill_input_buffer = fill_input_buffer;
src->pub.skip_input_data = skip_input_data;
src->pub.resync_to_restart = jpeg_resync_to_restart;
src->pub.term_source = term_source;
src->inbuf = inbuf;
src->bufsize=bufsize;
src->pub.bytes_in_buffer = 0;
src->pub.next_input_byte = NULL;
}
struct my_error_mgr
{
struct jpeg_error_mgr pub;
jmp_buf setjmp_buffer;
};
typedef struct my_error_mgr * my_error_ptr;
METHODDEF(void) my_error_exit (j_common_ptr cinfo)
{
my_error_ptr myerr=(my_error_ptr) cinfo->err;
(*cinfo->err->output_message) (cinfo);
longjmp(myerr->setjmp_buffer, 1);
}
static struct jpeg_decompress_struct cinfo;
static struct my_error_mgr jerr;
static int row_stride;
static unsigned char *temp_row=NULL;
// decode a frame
static mp_image_t* decode(sh_video_t *sh,void* data,int len,int flags){
mp_image_t * mpi = NULL;
int width,height,depth,i;
if ( len <= 0 ) return NULL; // skipped frame
cinfo.err=jpeg_std_error( &jerr.pub );
jerr.pub.error_exit=my_error_exit;
if( setjmp( jerr.setjmp_buffer ) )
{
mp_msg( MSGT_DECVIDEO,MSGL_ERR,"[ijpg] setjmp error ...\n" );
return NULL;
}
jpeg_create_decompress( &cinfo );
jpeg_buf_src( &cinfo,data,len );
jpeg_read_header( &cinfo,TRUE );
sh->disp_w=width=cinfo.image_width;
sh->disp_h=height=cinfo.image_height;
jpeg_start_decompress( &cinfo );
depth=cinfo.output_components * 8;
switch( depth ) {
case 8:
case 24: break;
default: mp_msg( MSGT_DECVIDEO,MSGL_ERR,"Sorry, unsupported JPEG colorspace: %d.\n",depth ); return NULL;
}
if ( last_w!=width || last_h!=height )
{
if(!mpcodecs_config_vo( sh,width,height, IMGFMT_RGB24 )) return NULL;
if(temp_row) free(temp_row);
temp_row=malloc(3*width+16);
last_w=width; last_h=height;
}
mpi=mpcodecs_get_image( sh,MP_IMGTYPE_TEMP,MP_IMGFLAG_ACCEPT_STRIDE,width,height );
if ( !mpi ) return NULL;
row_stride=cinfo.output_width * cinfo.output_components;
for ( i=0;i < height;i++ )
{
unsigned char * drow = mpi->planes[0] + mpi->stride[0] * i;
unsigned char * row = (mpi->imgfmt==IMGFMT_RGB24 && depth==24) ? drow : temp_row;
jpeg_read_scanlines( &cinfo,(JSAMPLE**)&row,1 );
if(depth==8){
// grayscale -> rgb/bgr 24/32
int x;
if(mpi->bpp==32)
for(x=0;x<width;x++) drow[4*x]=0x010101*row[x];
else
for(x=0;x<width;x++) drow[3*x+0]=drow[3*x+1]=drow[3*x+2]=row[x];
} else {
int x;
switch(mpi->imgfmt){
// rgb24 -> bgr24
case IMGFMT_BGR24:
for(x=0;x<3*width;x+=3){
drow[x+0]=row[x+2];
drow[x+1]=row[x+1];
drow[x+2]=row[x+0];
}
break;
// rgb24 -> bgr32
case IMGFMT_BGR32:
for(x=0;x<width;x++){
#ifdef WORDS_BIGENDIAN
drow[4*x+1]=row[3*x+0];
drow[4*x+2]=row[3*x+1];
drow[4*x+3]=row[3*x+2];
#else
drow[4*x+0]=row[3*x+2];
drow[4*x+1]=row[3*x+1];
drow[4*x+2]=row[3*x+0];
#endif
}
break;
}
}
}
jpeg_finish_decompress(&cinfo);
jpeg_destroy_decompress(&cinfo);
return mpi;
}
|