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
228
229
230
231
232
|
/*
* Copyright (C) 2005 Rik Snel <rsnel@cube.dyndns.org>, license GPL v2
* - based on vd_mpegpes.c by A'rpi (C) 2002-2003
* - guess_mjpeg_type code stolen from lav_io.c (C) 2000 Rainer Johanni
* <Rainer@Johanni.de> from the mjpegtools package
*/
#include <stdio.h>
#include <stdlib.h>
#include "config.h"
#include "mp_msg.h"
#include "vfcap.h"
/* some convenient #define's, is this portable enough? */
#define VERBOSE(...) mp_msg(MSGT_DECVIDEO, MSGL_V, "vd_zrmjpeg: " __VA_ARGS__)
#define ERROR(...) mp_msg(MSGT_DECVIDEO, MSGL_ERR, "vd_zrmjpeg: " __VA_ARGS__)
#define WARNING(...) mp_msg(MSGT_DECVIDEO, MSGL_WARN, \
"vd_zrmjpeg: " __VA_ARGS__)
#include "vd_internal.h"
static vd_info_t info =
{
"Zoran MJPEG Video passthrough",
"zrmjpeg",
"Rik Snel <snel@phys.uu.nl>",
"Rik Snel <snel@phys.uu.nl>",
"for hw decoders (DC10(+)/buz/lml33)"
};
LIBVD_EXTERN(zrmjpeg)
#include "libvo/video_out.h"
typedef struct {
int vo_inited;
unsigned int preferred_csp;
} vd_zrmjpeg_ctx_t;
static int query_format(sh_video_t *sh, unsigned int format) {
vd_zrmjpeg_ctx_t *ctx = sh->context;
if (format == ctx->preferred_csp) return VFCAP_CSP_SUPPORTED;
return CONTROL_FALSE;
}
// to set/get/query special features/parameters
static int control(sh_video_t *sh, int cmd, void* arg, ...) {
switch (cmd) {
case VDCTRL_QUERY_FORMAT:
return query_format(sh, *((unsigned int*)arg));
}
return CONTROL_UNKNOWN;
}
// init driver
static int init(sh_video_t *sh) {
vd_zrmjpeg_ctx_t *ctx;
VERBOSE("init called\n");
ctx = malloc(sizeof(*ctx));
if (!ctx) return 0;
memset(ctx, 0, sizeof(*ctx));
sh->context = ctx;
/* defer init of vo until the first frame is known */
return 1;
#if 0
return mpcodecs_config_vo(sh, sh->disp_w, sh->disp_h, IMGFMT_ZRMJPEGIT);
#endif
}
// uninit driver
static void uninit(sh_video_t *sh) {
free(sh->context);
}
/* parts directly stolen from scan_jpg() and lav_open_input_file */
static int get_int2(unsigned char *buf) {
return buf[0]*256 + buf[1];
}
#define M_SOF0 0xC0
#define M_SOF1 0xC1
#define M_DHT 0xC4
#define M_SOI 0xD8 /* Start Of Image (beginning of datastream) */
#define M_EOI 0xD9 /* End Of Image (end of datastream) */
#define M_SOS 0xDA /* Start Of Scan (begins compressed data) */
#define M_DQT 0xDB
#define M_APP0 0xE0
#define M_APP1 0xE1
/* returns 0 in case of failure */
static unsigned int guess_mjpeg_type(unsigned char *data, unsigned int size,
int d_height) {
unsigned int p;
int marker, length, height, ncomps, i, hf[3], vf[3];
unsigned int app0 = 0, header = 0;
/* The initial marker must be SIO */
if (size < 2) {
ERROR("JPEG data too short (%d bytes)\n", size);
return 0;
}
if (data[0] != 0xFF || data[1] != M_SOI) {
ERROR("JPEG data must start with FFD8, but doesn't\n");
return 0;
}
p = 2; /* pointer within jpeg data */
while (p < size) {
/* search 0xFF */
while(data[p] != 0xFF) {
p++;
if (p >= size) return 0;
}
/* get marker code, skip duplicate FF's */
while(data[p] == 0xFF) {
p++;
if (p >= size) return 0;
}
marker = data[p++];
/* marker may have an associated length */
if (p <= size - 2) length = get_int2(data+p);
else length = 0;
switch (marker) {
case M_SOF0:
case M_SOF1:
header = p-2;
VERBOSE("found offset of header %u\n",
header);
break;
case M_SOS:
size = 0;
continue;
case M_APP0:
app0 = p-2;
VERBOSE("found offset of APP0 %u\n",
app0);
break;
}
/* these markers shouldn't have parameters,
* i.e. we don't need to skip anaything */
if (marker == 0 || marker == 1 ||
(marker >= 0xd0 && marker < 0xd8))
continue;
if (p + length <= size) p += length;
else {
ERROR("input JPEG too short, data missing\n");
return 0;
}
}
if (!header) {
ERROR("JPEG header (with resolution and sampling factors) not found\n");
return 0;
}
if (data[header + 9] != 3) {
ERROR("JPEG has wrong number of components\n");
return 0;
}
/* get the horizontal and vertical sample factors */
for (i = 0; i < 3; i++) {
hf[i] = data[header + 10 + 3*i + 1]>>4;
vf[i] = data[header + 10 + 3*i + 1]&0x0F;
}
if (hf[0] != 2 || hf[1] != 1 || hf[2] != 1 ||
vf[0] != 1 || vf[1] != 1 || vf[2] != 1) {
ERROR("JPEG has wrong internal image format\n");
} else VERBOSE("JPEG has colorspace YUV422 with minimal sampling factors (good)\n");
height = get_int2(data + header + 5);
if (height == d_height) {
VERBOSE("data is non interlaced\n");
return IMGFMT_ZRMJPEGNI;
}
if (2*height != d_height) {
ERROR("something very inconsistent happened\n");
return 0;
}
if (app0 && get_int2(data + app0 + 2) >= 5 &&
strncasecmp((char*)(data + app0 + 4), "AVI1", 4) == 0) {
if (data[app0+8] == 1) {
VERBOSE("data is interlaced, APP0: top-first (1)\n");
return IMGFMT_ZRMJPEGIT;
} else {
VERBOSE("data is interlaced, APP0: bottom-first (%d)\n",
data[app0+8]);
return IMGFMT_ZRMJPEGIB;
}
} else {
VERBOSE("data is interlaced, no (valid) APP0 marker, "
"guessing top-first\n");
return IMGFMT_ZRMJPEGIT;
}
return 0;
}
// decode a frame
static mp_image_t* decode(sh_video_t *sh, void* data, int len, int flags) {
mp_image_t* mpi;
vd_zrmjpeg_ctx_t *ctx = sh->context;
if (!ctx->vo_inited) {
ctx->preferred_csp = guess_mjpeg_type(data, len, sh->disp_h);
if (ctx->preferred_csp == 0) return NULL;
mpcodecs_config_vo(sh, sh->disp_w, sh->disp_h,
ctx->preferred_csp);
ctx->vo_inited = 1;
}
mpi = mpcodecs_get_image(sh, MP_IMGTYPE_EXPORT, 0,
sh->disp_w, sh->disp_h);
/* abuse of mpi */
mpi->planes[0]=(uint8_t*)data;
mpi->planes[1]=(uint8_t*)len;
return mpi;
}
|
