2
* Linux video grab interface
3
* Copyright (c) 2000,2001 Fabrice Bellard.
5
* This library is free software; you can redistribute it and/or
6
* modify it under the terms of the GNU Lesser General Public
7
* License as published by the Free Software Foundation; either
8
* version 2 of the License, or (at your option) any later version.
10
* This library is distributed in the hope that it will be useful,
11
* but WITHOUT ANY WARRANTY; without even the implied warranty of
12
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13
* Lesser General Public License for more details.
15
* You should have received a copy of the GNU Lesser General Public
16
* License along with this library; if not, write to the Free Software
17
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
22
#include <sys/ioctl.h>
25
#define _LINUX_TIME_H 1
26
#include <linux/videodev.h>
31
int frame_format; /* see VIDEO_PALETTE_xxx */
38
struct video_capability video_cap;
39
struct video_audio audio_saved;
41
struct video_mbuf gb_buffers;
42
struct video_mmap gb_buf;
45
/* ATI All In Wonder specific stuff */
46
/* XXX: remove and merge in libavcodec/imgconvert.c */
54
static int aiw_init(VideoData *s);
55
static int aiw_read_picture(VideoData *s, uint8_t *data);
56
static int aiw_close(VideoData *s);
58
static int grab_read_header(AVFormatContext *s1, AVFormatParameters *ap)
60
VideoData *s = s1->priv_data;
63
int video_fd, frame_size;
64
int ret, frame_rate, frame_rate_base;
66
struct video_tuner tuner;
67
struct video_audio audio;
68
const char *video_device;
70
if (!ap || ap->width <= 0 || ap->height <= 0 || ap->frame_rate <= 0)
75
frame_rate = ap->frame_rate;
76
frame_rate_base = ap->frame_rate_base;
78
st = av_new_stream(s1, 0);
84
s->frame_rate = frame_rate;
85
s->frame_rate_base = frame_rate_base;
87
video_device = ap->device;
89
video_device = "/dev/video";
90
video_fd = open(video_device, O_RDWR);
96
if (ioctl(video_fd,VIDIOCGCAP, &s->video_cap) < 0) {
101
if (!(s->video_cap.type & VID_TYPE_CAPTURE)) {
102
fprintf(stderr, "Fatal: grab device does not handle capture\n");
106
desired_palette = -1;
107
if (st->codec.pix_fmt == PIX_FMT_YUV420P) {
108
desired_palette = VIDEO_PALETTE_YUV420P;
109
} else if (st->codec.pix_fmt == PIX_FMT_YUV422) {
110
desired_palette = VIDEO_PALETTE_YUV422;
111
} else if (st->codec.pix_fmt == PIX_FMT_BGR24) {
112
desired_palette = VIDEO_PALETTE_RGB24;
115
/* set tv standard */
116
if (ap->standard && !ioctl(video_fd, VIDIOCGTUNER, &tuner)) {
117
if (!strcasecmp(ap->standard, "pal"))
118
tuner.mode = VIDEO_MODE_PAL;
119
else if (!strcasecmp(ap->standard, "secam"))
120
tuner.mode = VIDEO_MODE_SECAM;
122
tuner.mode = VIDEO_MODE_NTSC;
123
ioctl(video_fd, VIDIOCSTUNER, &tuner);
128
ioctl(video_fd, VIDIOCGAUDIO, &audio);
129
memcpy(&s->audio_saved, &audio, sizeof(audio));
130
audio.flags &= ~VIDEO_AUDIO_MUTE;
131
ioctl(video_fd, VIDIOCSAUDIO, &audio);
133
ret = ioctl(video_fd,VIDIOCGMBUF,&s->gb_buffers);
135
/* try to use read based access */
136
struct video_window win;
137
struct video_picture pict;
147
ioctl(video_fd, VIDIOCSWIN, &win);
149
ioctl(video_fd, VIDIOCGPICT, &pict);
151
printf("v4l: colour=%d hue=%d brightness=%d constrast=%d whiteness=%d\n",
158
/* try to choose a suitable video format */
159
pict.palette = desired_palette;
160
if (desired_palette == -1 || (ret = ioctl(video_fd, VIDIOCSPICT, &pict)) < 0) {
161
pict.palette=VIDEO_PALETTE_YUV420P;
162
ret = ioctl(video_fd, VIDIOCSPICT, &pict);
164
pict.palette=VIDEO_PALETTE_YUV422;
165
ret = ioctl(video_fd, VIDIOCSPICT, &pict);
167
pict.palette=VIDEO_PALETTE_RGB24;
168
ret = ioctl(video_fd, VIDIOCSPICT, &pict);
175
s->frame_format = pict.palette;
178
ioctl(video_fd, VIDIOCCAPTURE, &val);
180
s->time_frame = av_gettime();
183
/* ATI All In Wonder automatic activation */
184
if (!strcmp(s->video_cap.name, "Km")) {
188
/* force 420P format because convertion from YUV422 to YUV420P
189
is done in this driver (ugly) */
190
s->frame_format = VIDEO_PALETTE_YUV420P;
193
s->video_buf = mmap(0,s->gb_buffers.size,PROT_READ|PROT_WRITE,MAP_SHARED,video_fd,0);
194
if ((unsigned char*)-1 == s->video_buf) {
199
s->time_frame = av_gettime();
201
/* start to grab the first frame */
202
s->gb_buf.frame = s->gb_frame % s->gb_buffers.frames;
203
s->gb_buf.height = height;
204
s->gb_buf.width = width;
205
s->gb_buf.format = desired_palette;
207
if (desired_palette == -1 || (ret = ioctl(video_fd, VIDIOCMCAPTURE, &s->gb_buf)) < 0) {
208
s->gb_buf.format = VIDEO_PALETTE_YUV420P;
210
ret = ioctl(video_fd, VIDIOCMCAPTURE, &s->gb_buf);
211
if (ret < 0 && errno != EAGAIN) {
213
s->gb_buf.format = VIDEO_PALETTE_YUV422;
215
ret = ioctl(video_fd, VIDIOCMCAPTURE, &s->gb_buf);
216
if (ret < 0 && errno != EAGAIN) {
218
s->gb_buf.format = VIDEO_PALETTE_RGB24;
219
ret = ioctl(video_fd, VIDIOCMCAPTURE, &s->gb_buf);
224
if (errno != EAGAIN) {
226
fprintf(stderr, "Fatal: grab device does not support suitable format\n");
228
fprintf(stderr,"Fatal: grab device does not receive any video signal\n");
232
s->frame_format = s->gb_buf.format;
236
switch(s->frame_format) {
237
case VIDEO_PALETTE_YUV420P:
238
frame_size = (width * height * 3) / 2;
239
st->codec.pix_fmt = PIX_FMT_YUV420P;
241
case VIDEO_PALETTE_YUV422:
242
frame_size = width * height * 2;
243
st->codec.pix_fmt = PIX_FMT_YUV422;
245
case VIDEO_PALETTE_RGB24:
246
frame_size = width * height * 3;
247
st->codec.pix_fmt = PIX_FMT_BGR24; /* NOTE: v4l uses BGR24, not RGB24 ! */
253
s->frame_size = frame_size;
255
st->codec.codec_type = CODEC_TYPE_VIDEO;
256
st->codec.codec_id = CODEC_ID_RAWVIDEO;
257
st->codec.width = width;
258
st->codec.height = height;
259
st->codec.frame_rate = frame_rate;
260
st->codec.frame_rate_base = frame_rate_base;
262
av_set_pts_info(s1, 48, 1, 1000000); /* 48 bits pts in us */
272
static int v4l_mm_read_picture(VideoData *s, uint8_t *buf)
276
/* Setup to capture the next frame */
277
s->gb_buf.frame = (s->gb_frame + 1) % s->gb_buffers.frames;
278
if (ioctl(s->fd, VIDIOCMCAPTURE, &s->gb_buf) < 0) {
280
fprintf(stderr,"Cannot Sync\n");
282
perror("VIDIOCMCAPTURE");
286
while (ioctl(s->fd, VIDIOCSYNC, &s->gb_frame) < 0 &&
287
(errno == EAGAIN || errno == EINTR));
289
ptr = s->video_buf + s->gb_buffers.offsets[s->gb_frame];
290
memcpy(buf, ptr, s->frame_size);
292
/* This is now the grabbing frame */
293
s->gb_frame = s->gb_buf.frame;
295
return s->frame_size;
298
static int grab_read_packet(AVFormatContext *s1, AVPacket *pkt)
300
VideoData *s = s1->priv_data;
301
int64_t curtime, delay;
303
int64_t per_frame = (int64_t_C(1000000) * s->frame_rate_base) / s->frame_rate;
305
/* Calculate the time of the next frame */
306
s->time_frame += per_frame;
308
/* wait based on the frame rate */
310
curtime = av_gettime();
311
delay = s->time_frame - curtime;
313
if (delay < -per_frame) {
314
/* printf("grabbing is %d frames late (dropping)\n", (int) -(delay / 16666)); */
315
s->time_frame += per_frame;
319
ts.tv_sec = delay / 1000000;
320
ts.tv_nsec = (delay % 1000000) * 1000;
321
nanosleep(&ts, NULL);
324
if (av_new_packet(pkt, s->frame_size) < 0)
327
pkt->pts = curtime & ((1LL << 48) - 1);
330
if (s->aiw_enabled) {
331
return aiw_read_picture(s, pkt->data);
332
} else if (s->use_mmap) {
333
return v4l_mm_read_picture(s, pkt->data);
335
if (read(s->fd, pkt->data, pkt->size) != pkt->size)
337
return s->frame_size;
341
static int grab_read_close(AVFormatContext *s1)
343
VideoData *s = s1->priv_data;
349
munmap(s->video_buf, s->gb_buffers.size);
351
/* mute audio. we must force it because the BTTV driver does not
352
return its state correctly */
353
s->audio_saved.flags |= VIDEO_AUDIO_MUTE;
354
ioctl(s->fd, VIDIOCSAUDIO, &s->audio_saved);
360
static AVInputFormat video_grab_device_format = {
368
.flags = AVFMT_NOFILE,
371
/* All in Wonder specific stuff */
372
/* XXX: remove and merge in libavcodec/imgconvert.c */
374
static int aiw_init(VideoData *s)
381
if ((width == s->video_cap.maxwidth && height == s->video_cap.maxheight) ||
382
(width == s->video_cap.maxwidth && height == s->video_cap.maxheight*2) ||
383
(width == s->video_cap.maxwidth/2 && height == s->video_cap.maxheight)) {
387
if (height == s->video_cap.maxheight*2) s->deint=1;
388
if (width == s->video_cap.maxwidth/2) s->halfw=1;
390
fprintf(stderr,"\nIncorrect Grab Size Supplied - Supported Sizes Are:\n");
391
fprintf(stderr," %dx%d %dx%d %dx%d\n\n",
392
s->video_cap.maxwidth,s->video_cap.maxheight,
393
s->video_cap.maxwidth,s->video_cap.maxheight*2,
394
s->video_cap.maxwidth/2,s->video_cap.maxheight);
399
s->src_mem = av_malloc(s->width*2);
401
s->src_mem = av_malloc(s->width*4);
403
if (!s->src_mem) goto fail;
405
s->lum_m4_mem = av_malloc(s->width);
410
av_freep(&s->src_mem);
411
av_freep(&s->lum_m4_mem);
416
#include "../libavcodec/i386/mmx.h"
418
#define LINE_WITH_UV \
419
movq_m2r(ptr[0],mm0); \
420
movq_m2r(ptr[8],mm1); \
421
movq_r2r(mm0, mm4); \
422
punpcklbw_r2r(mm1,mm0); \
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punpckhbw_r2r(mm1,mm4); \
425
punpcklbw_r2r(mm4,mm0); \
426
punpckhbw_r2r(mm4,mm5); \
428
punpcklbw_r2r(mm5,mm1); \
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movq_r2m(mm1,lum[0]); \
430
movq_m2r(ptr[16],mm2); \
431
movq_m2r(ptr[24],mm1); \
433
punpcklbw_r2r(mm1,mm2); \
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punpckhbw_r2r(mm1,mm4); \
436
punpcklbw_r2r(mm4,mm2); \
437
punpckhbw_r2r(mm4,mm3); \
439
punpcklbw_r2r(mm3,mm1); \
440
movq_r2m(mm1,lum[8]); \
441
punpckhdq_r2r(mm2,mm0); \
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punpckhdq_r2r(mm3,mm5); \
443
movq_r2m(mm0,cb[0]); \
447
movq_m2r(ptr[0],mm0);\
448
movq_m2r(ptr[8],mm1);\
450
punpcklbw_r2r(mm1,mm0); \
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punpckhbw_r2r(mm1,mm4);\
453
punpcklbw_r2r(mm4,mm0);\
454
punpckhbw_r2r(mm4,mm5);\
456
punpcklbw_r2r(mm5,mm1);\
457
movq_r2m(mm1,lum[0]);\
458
movq_m2r(ptr[16],mm2);\
459
movq_m2r(ptr[24],mm1);\
461
punpcklbw_r2r(mm1,mm2);\
462
punpckhbw_r2r(mm1,mm4);\
464
punpcklbw_r2r(mm4,mm2);\
465
punpckhbw_r2r(mm4,mm3);\
467
punpcklbw_r2r(mm3,mm1);\
468
movq_r2m(mm1,lum[8]);
470
#define LINE_WITHUV_AVG \
471
movq_m2r(ptr[0], mm0);\
472
movq_m2r(ptr[8], mm1);\
474
punpcklbw_r2r(mm1,mm0);\
475
punpckhbw_r2r(mm1,mm4);\
477
punpcklbw_r2r(mm4,mm0);\
478
punpckhbw_r2r(mm4,mm5);\
481
punpcklbw_r2r(mm7,mm1);\
482
punpcklbw_r2r(mm7,mm2);\
486
packuswb_r2r(mm7,mm1);\
487
movd_r2m(mm1,lum[0]);\
488
movq_m2r(ptr[16],mm2);\
489
movq_m2r(ptr[24],mm1);\
491
punpcklbw_r2r(mm1,mm2);\
492
punpckhbw_r2r(mm1,mm4);\
494
punpcklbw_r2r(mm4,mm2);\
495
punpckhbw_r2r(mm4,mm3);\
498
punpcklbw_r2r(mm7,mm1);\
499
punpcklbw_r2r(mm7,mm4);\
503
packuswb_r2r(mm7,mm1);\
504
movd_r2m(mm1,lum[4]);\
505
punpckhbw_r2r(mm7,mm0);\
506
punpckhbw_r2r(mm7,mm2);\
510
packuswb_r2r(mm7,mm0);\
511
punpckhbw_r2r(mm7,mm5);\
512
punpckhbw_r2r(mm7,mm3);\
516
packuswb_r2r(mm7,mm5);\
517
movd_r2m(mm0,cb[0]);\
520
#define LINE_NOUV_AVG \
521
movq_m2r(ptr[0],mm0);\
522
movq_m2r(ptr[8],mm1);\
525
pmaddwd_r2r(mm6,mm0);\
526
pmaddwd_r2r(mm6,mm1);\
527
packssdw_r2r(mm1,mm0);\
530
movq_m2r(ptr[16],mm2);\
531
movq_m2r(ptr[24],mm3);\
534
pmaddwd_r2r(mm6,mm2);\
535
pmaddwd_r2r(mm6,mm3);\
536
packssdw_r2r(mm3,mm2);\
539
packuswb_r2r(mm2,mm0);\
540
movq_r2m(mm0,lum[0]);
542
#define DEINT_LINE_LUM(ptroff) \
543
movd_m2r(lum_m4[(ptroff)],mm0);\
544
movd_m2r(lum_m3[(ptroff)],mm1);\
545
movd_m2r(lum_m2[(ptroff)],mm2);\
546
movd_m2r(lum_m1[(ptroff)],mm3);\
547
movd_m2r(lum[(ptroff)],mm4);\
548
punpcklbw_r2r(mm7,mm0);\
549
movd_r2m(mm2,lum_m4[(ptroff)]);\
550
punpcklbw_r2r(mm7,mm1);\
551
punpcklbw_r2r(mm7,mm2);\
552
punpcklbw_r2r(mm7,mm3);\
553
punpcklbw_r2r(mm7,mm4);\
561
psubusw_r2r(mm0,mm1);\
563
packuswb_r2r(mm7,mm1);\
564
movd_r2m(mm1,lum_m2[(ptroff)]);
567
#include "../libavcodec/dsputil.h"
569
#define LINE_WITH_UV \
570
lum[0]=ptr[0];lum[1]=ptr[2];lum[2]=ptr[4];lum[3]=ptr[6];\
571
cb[0]=ptr[1];cb[1]=ptr[5];\
572
cr[0]=ptr[3];cr[1]=ptr[7];\
573
lum[4]=ptr[8];lum[5]=ptr[10];lum[6]=ptr[12];lum[7]=ptr[14];\
574
cb[2]=ptr[9];cb[3]=ptr[13];\
575
cr[2]=ptr[11];cr[3]=ptr[15];\
576
lum[8]=ptr[16];lum[9]=ptr[18];lum[10]=ptr[20];lum[11]=ptr[22];\
577
cb[4]=ptr[17];cb[5]=ptr[21];\
578
cr[4]=ptr[19];cr[5]=ptr[23];\
579
lum[12]=ptr[24];lum[13]=ptr[26];lum[14]=ptr[28];lum[15]=ptr[30];\
580
cb[6]=ptr[25];cb[7]=ptr[29];\
581
cr[6]=ptr[27];cr[7]=ptr[31];
584
lum[0]=ptr[0];lum[1]=ptr[2];lum[2]=ptr[4];lum[3]=ptr[6];\
585
lum[4]=ptr[8];lum[5]=ptr[10];lum[6]=ptr[12];lum[7]=ptr[14];\
586
lum[8]=ptr[16];lum[9]=ptr[18];lum[10]=ptr[20];lum[11]=ptr[22];\
587
lum[12]=ptr[24];lum[13]=ptr[26];lum[14]=ptr[28];lum[15]=ptr[30];
589
#define LINE_WITHUV_AVG \
590
sum=(ptr[0]+ptr[2]+1) >> 1;lum[0]=sum; \
591
sum=(ptr[4]+ptr[6]+1) >> 1;lum[1]=sum; \
592
sum=(ptr[1]+ptr[5]+1) >> 1;cb[0]=sum; \
593
sum=(ptr[3]+ptr[7]+1) >> 1;cr[0]=sum; \
594
sum=(ptr[8]+ptr[10]+1) >> 1;lum[2]=sum; \
595
sum=(ptr[12]+ptr[14]+1) >> 1;lum[3]=sum; \
596
sum=(ptr[9]+ptr[13]+1) >> 1;cb[1]=sum; \
597
sum=(ptr[11]+ptr[15]+1) >> 1;cr[1]=sum; \
598
sum=(ptr[16]+ptr[18]+1) >> 1;lum[4]=sum; \
599
sum=(ptr[20]+ptr[22]+1) >> 1;lum[5]=sum; \
600
sum=(ptr[17]+ptr[21]+1) >> 1;cb[2]=sum; \
601
sum=(ptr[19]+ptr[23]+1) >> 1;cr[2]=sum; \
602
sum=(ptr[24]+ptr[26]+1) >> 1;lum[6]=sum; \
603
sum=(ptr[28]+ptr[30]+1) >> 1;lum[7]=sum; \
604
sum=(ptr[25]+ptr[29]+1) >> 1;cb[3]=sum; \
605
sum=(ptr[27]+ptr[31]+1) >> 1;cr[3]=sum;
607
#define LINE_NOUV_AVG \
608
sum=(ptr[0]+ptr[2]+1) >> 1;lum[0]=sum; \
609
sum=(ptr[4]+ptr[6]+1) >> 1;lum[1]=sum; \
610
sum=(ptr[8]+ptr[10]+1) >> 1;lum[2]=sum; \
611
sum=(ptr[12]+ptr[14]+1) >> 1;lum[3]=sum; \
612
sum=(ptr[16]+ptr[18]+1) >> 1;lum[4]=sum; \
613
sum=(ptr[20]+ptr[22]+1) >> 1;lum[5]=sum; \
614
sum=(ptr[24]+ptr[26]+1) >> 1;lum[6]=sum; \
615
sum=(ptr[28]+ptr[30]+1) >> 1;lum[7]=sum;
617
#define DEINT_LINE_LUM(ptroff) \
618
sum=(-lum_m4[(ptroff)]+(lum_m3[(ptroff)]<<2)+(lum_m2[(ptroff)]<<1)+(lum_m1[(ptroff)]<<2)-lum[(ptroff)]); \
619
lum_m4[(ptroff)]=lum_m2[(ptroff)];\
620
lum_m2[(ptroff)]=cm[(sum+4)>>3];\
621
sum=(-lum_m4[(ptroff)+1]+(lum_m3[(ptroff)+1]<<2)+(lum_m2[(ptroff)+1]<<1)+(lum_m1[(ptroff)+1]<<2)-lum[(ptroff)+1]); \
622
lum_m4[(ptroff)+1]=lum_m2[(ptroff)+1];\
623
lum_m2[(ptroff)+1]=cm[(sum+4)>>3];\
624
sum=(-lum_m4[(ptroff)+2]+(lum_m3[(ptroff)+2]<<2)+(lum_m2[(ptroff)+2]<<1)+(lum_m1[(ptroff)+2]<<2)-lum[(ptroff)+2]); \
625
lum_m4[(ptroff)+2]=lum_m2[(ptroff)+2];\
626
lum_m2[(ptroff)+2]=cm[(sum+4)>>3];\
627
sum=(-lum_m4[(ptroff)+3]+(lum_m3[(ptroff)+3]<<2)+(lum_m2[(ptroff)+3]<<1)+(lum_m1[(ptroff)+3]<<2)-lum[(ptroff)+3]); \
628
lum_m4[(ptroff)+3]=lum_m2[(ptroff)+3];\
629
lum_m2[(ptroff)+3]=cm[(sum+4)>>3];
634
/* Read two fields separately. */
635
static int aiw_read_picture(VideoData *s, uint8_t *data)
637
uint8_t *ptr, *lum, *cb, *cr;
642
uint8_t* src = s->src_mem;
643
uint8_t *ptrend = &src[s->width*2];
645
cb=&lum[s->width*s->height];
646
cr=&cb[(s->width*s->height)/4];
647
if (s->deint == 0 && s->halfw == 0) {
648
while (read(s->fd,src,s->width*2) < 0) {
651
for (h = 0; h < s->height-2; h+=2) {
652
for (ptr = &src[0]; ptr < ptrend; ptr+=32, lum+=16, cb+=8, cr+=8) {
655
read(s->fd,src,s->width*2);
656
for (ptr = &src[0]; ptr < ptrend; ptr+=32, lum+=16) {
659
read(s->fd,src,s->width*2);
664
for (ptr = &src[0]; ptr < ptrend; ptr+=32, lum+=16, cb+=8, cr+=8) {
667
read(s->fd,src,s->width*2);
668
for (ptr = &src[0]; ptr < ptrend; ptr+=32, lum+=16) {
671
/* drop second field */
672
while (read(s->fd,src,s->width*2) < 0) {
675
for (h = 0; h < s->height - 1; h++) {
676
read(s->fd,src,s->width*2);
678
} else if (s->halfw == 1) {
695
movq_m2r(rounder,mm6);
697
while (read(s->fd,src,s->width*4) < 0) {
700
ptrend = &src[s->width*4];
701
for (h = 0; h < s->height-2; h+=2) {
702
for (ptr = &src[0]; ptr < ptrend; ptr+=32, lum+=8, cb+=4, cr+=4) {
705
read(s->fd,src,s->width*4);
707
movq_m2r(masker,mm5);
709
for (ptr = &src[0]; ptr < ptrend; ptr+=32, lum+=8) {
712
read(s->fd,src,s->width*4);
717
for (ptr = &src[0]; ptr < ptrend; ptr+=32, lum+=8, cb+=4, cr+=4) {
720
read(s->fd,src,s->width*4);
722
movq_m2r(masker,mm5);
724
for (ptr = &src[0]; ptr < ptrend; ptr+=32, lum+=8) {
727
/* drop second field */
728
while (read(s->fd,src,s->width*4) < 0) {
731
for (h = 0; h < s->height - 1; h++) {
732
read(s->fd,src,s->width*4);
735
uint8_t *lum_m1, *lum_m2, *lum_m3, *lum_m4;
742
movq_m2r(rounder,mm6);
745
uint8_t *cm = cropTbl + MAX_NEG_CROP;
748
/* read two fields and deinterlace them */
749
while (read(s->fd,src,s->width*2) < 0) {
752
for (h = 0; h < (s->height/2)-2; h+=2) {
753
for (ptr = &src[0]; ptr < ptrend; ptr+=32, lum+=16, cb+=8, cr+=8) {
756
read(s->fd,src,s->width*2);
757
/* skip a luminance line - will be filled in later */
759
for (ptr = &src[0]; ptr < ptrend; ptr+=32, lum+=16, cb+=8, cr+=8) {
762
/* skip a luminance line - will be filled in later */
764
read(s->fd,src,s->width*2);
769
for (ptr = &src[0]; ptr < ptrend; ptr+=32, lum+=16, cb+=8, cr+=8) {
772
/* skip a luminance line - will be filled in later */
774
read(s->fd,src,s->width*2);
775
for (ptr = &src[0]; ptr < ptrend; ptr+=32, lum+=16, cb+=8, cr+=8) {
784
while (read(s->fd,src,s->width*2) < 0) {
787
/* First (and last) two lines not interlaced */
788
for (h = 0; h < 2; h++) {
789
for (ptr = &src[0]; ptr < ptrend; ptr+=32, lum+=16) {
792
read(s->fd,src,s->width*2);
793
/* skip a luminance line */
796
lum_m1=&lum[-s->width];
797
lum_m2=&lum_m1[-s->width];
798
lum_m3=&lum_m2[-s->width];
799
memmove(s->lum_m4_mem,&lum_m3[-s->width],s->width);
800
for (; h < (s->height/2)-1; h++) {
801
lum_m4=s->lum_m4_mem;
802
for (ptr = &src[0]; ptr < ptrend; ptr+=32, lum+=16,lum_m1+=16,lum_m2+=16,lum_m3+=16,lum_m4+=16) {
810
read(s->fd,src,s->width*2);
811
/* skip a luminance line */
816
// lum_m4 += s->width;
821
lum_m4=s->lum_m4_mem;
822
for (ptr = &src[0]; ptr < ptrend; ptr+=32, lum+=16, lum_m1+=16, lum_m2+=16, lum_m3+=16, lum_m4+=16) {
834
return s->frame_size;
837
static int aiw_close(VideoData *s)
839
av_freep(&s->lum_m4_mem);
840
av_freep(&s->src_mem);
844
int video_grab_init(void)
846
av_register_input_format(&video_grab_device_format);