aboutsummaryrefslogtreecommitdiffhomepage
path: root/libmpcodecs/vf_zrmjpeg.c
blob: 0d45666aa42df79ebab7230b0aa011488b2181cf (plain)
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
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
/*
 * This files includes a straightforward (to be) optimized JPEG encoder for
 * the YUV422 format, based on mjpeg code from ffmpeg.
 *
 * For an excellent introduction to the JPEG format, see:
 * http://www.ece.purdue.edu/~bouman/grad-labs/lab8/pdf/lab.pdf
 *
 * Copyright (C) 2005 Rik Snel <rsnel@cube.dyndns.org>
 * - based on vd_lavc.c by A'rpi (C) 2002-2003
 * - parts from ffmpeg Copyright (c) 2000-2003 Fabrice Bellard
 *
 * This file is part of MPlayer.
 *
 * MPlayer is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * MPlayer 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with MPlayer; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */

/**
 * \file vf_zrmjpeg.c
 *
 * \brief Does mjpeg encoding as required by the zrmjpeg filter as well
 * as by the zr video driver.
 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <inttypes.h>

#include "config.h"
#include "mp_msg.h"

#include "img_format.h"
#include "mp_image.h"
#include "vf.h"

/* We need this #define because we need ../libavcodec/common.h to #define
 * be2me_32, otherwise the linker will complain that it doesn't exist */
#define HAVE_AV_CONFIG_H
#include "libavcodec/avcodec.h"
#include "libavcodec/mjpegenc.h"
//#include "jpeg_enc.h" /* this file is not present yet */

#undef malloc
#undef free

/* some convenient #define's, is this portable enough? */
/// Printout  with vf_zrmjpeg: prefix at VERBOSE level
#define VERBOSE(...) mp_msg(MSGT_DECVIDEO, MSGL_V, "vf_zrmjpeg: " __VA_ARGS__)
/// Printout with vf_zrmjpeg: prefix at ERROR level
#define ERROR(...) mp_msg(MSGT_DECVIDEO, MSGL_ERR, "vf_zrmjpeg: " __VA_ARGS__)
/// Printout with vf_zrmjpeg: prefix at WARNING level
#define WARNING(...) mp_msg(MSGT_DECVIDEO, MSGL_WARN, \
		"vf_zrmjpeg: " __VA_ARGS__)

// "local" flag in vd_ffmpeg.c. If not set, avcodec_init() et. al. need to be called
// set when init is done, so that initialization is not done twice.
extern int avcodec_initialized;

/// The get_pixels() routine to use. The real routine comes from dsputil
static void (*get_pixels)(DCTELEM *restrict block, const uint8_t *pixels, int line_size);

/* Begin excessive code duplication ************************************/
/* Code coming from mpegvideo.c and mjpeg.c in ../libavcodec ***********/

/// copy of the table in mpegvideo.c
static const unsigned short aanscales[64] = {
	/**< precomputed values scaled up by 14 bits */
	16384, 22725, 21407, 19266, 16384, 12873,  8867,  4520,
	22725, 31521, 29692, 26722, 22725, 17855, 12299,  6270,
	21407, 29692, 27969, 25172, 21407, 16819, 11585,  5906,
	19266, 26722, 25172, 22654, 19266, 15137, 10426,  5315,
	16384, 22725, 21407, 19266, 16384, 12873,  8867,  4520,
	12873, 17855, 16819, 15137, 12873, 10114,  6967,  3552,
	8867,  12299, 11585, 10426,  8867,  6967,  4799,  2446,
	4520,   6270,  5906,  5315,  4520,  3552,  2446,  1247
};

/// Precompute DCT quantizing matrix
/**
 * This routine will precompute the combined DCT matrix with qscale
 * and DCT renorm needed by the MPEG encoder here. It is basically the
 * same as the routine with the same name in mpegvideo.c, except for
 * some coefficient changes. The matrix will be computed in two variations,
 * depending on the DCT version used. The second used by the MMX version of DCT.
 *
 * \param s MpegEncContext pointer
 * \param qmat[OUT] pointer to where the matrix is stored
 * \param qmat16[OUT] pointer to where matrix for MMX is stored.
 *		  This matrix is not permutated
 *                and second 64 entries are bias
 * \param quant_matrix[IN] the quantizion matrix to use
 * \param bias bias for the quantizer
 * \param qmin minimum qscale value to set up for
 * \param qmax maximum qscale value to set up for
 *
 * Only rows between qmin and qmax will be populated in the matrix.
 * In this MJPEG encoder, only the value 8 for qscale is used.
 */
static void convert_matrix(MpegEncContext *s, int (*qmat)[64],
		uint16_t (*qmat16)[2][64], const uint16_t *quant_matrix,
		int bias, int qmin, int qmax) {
	int qscale;

	for(qscale = qmin; qscale <= qmax; qscale++) {
		int i;
		if (s->dsp.fdct == ff_jpeg_fdct_islow) {
			for (i = 0; i < 64; i++) {
				const int j = s->dsp.idct_permutation[i];
/* 16 <= qscale * quant_matrix[i] <= 7905
 * 19952         <= aanscales[i] * qscale * quant_matrix[i]      <= 249205026
 * (1<<36)/19952 >= (1<<36)/(aanscales[i] * qscale * quant_matrix[i])
 *                                                       >= (1<<36)/249205026
 * 3444240       >= (1<<36)/(aanscales[i] * qscale * quant_matrix[i])  >= 275 */
				qmat[qscale][i] = (int)((UINT64_C(1) <<
					(QMAT_SHIFT-3))/
					(qscale*quant_matrix[j]));
			}
		} else if (s->dsp.fdct == fdct_ifast) {
			for (i = 0; i < 64; i++) {
				const int j = s->dsp.idct_permutation[i];
/* 16 <= qscale * quant_matrix[i] <= 7905
 * 19952         <= aanscales[i] * qscale * quant_matrix[i]      <= 249205026
 * (1<<36)/19952 >= (1<<36)/(aanscales[i] * qscale * quant_matrix[i])
 *                                                       >= (1<<36)/249205026
 * 3444240       >= (1<<36)/(aanscales[i] * qscale * quant_matrix[i])  >= 275 */
				qmat[qscale][i] = (int)((UINT64_C(1) <<
					(QMAT_SHIFT + 11))/(aanscales[i]
					*qscale * quant_matrix[j]));
			}
		} else {
			for (i = 0; i < 64; i++) {
				const int j = s->dsp.idct_permutation[i];
/* We can safely assume that 16 <= quant_matrix[i] <= 255
 * So 16           <= qscale * quant_matrix[i]             <= 7905
 * so (1<<19) / 16 >= (1<<19) / (qscale * quant_matrix[i]) >= (1<<19) / 7905
 * so 32768        >= (1<<19) / (qscale * quant_matrix[i]) >= 67 */
				qmat[qscale][i] = (int)((UINT64_C(1) <<
						QMAT_SHIFT_MMX) / (qscale
							*quant_matrix[j]));
				qmat16[qscale][0][i] = (1 << QMAT_SHIFT_MMX)
						/(qscale * quant_matrix[j]);

				if (qmat16[qscale][0][i] == 0 ||
						qmat16[qscale][0][i] == 128*256)
					qmat16[qscale][0][i]=128*256-1;
				qmat16[qscale][1][i]=ROUNDED_DIV(bias
						<<(16-QUANT_BIAS_SHIFT),
						qmat16[qscale][0][i]);
			}
		}
	}
}

/// Emit the DC value into a MJPEG code sream
/**
 * This routine is only intended to be used from encode_block
 *
 * \param s pointer to MpegEncContext structure
 * \param val the DC value to emit
 * \param huff_size pointer to huffman code size array
 * \param huff_code pointer to the code array corresponding to \a huff_size
 *
 * This routine is a clone of mjpeg_encode_dc
 */
static inline void encode_dc(MpegEncContext *s, int val,
		uint8_t *huff_size, uint16_t *huff_code) {
	int mant, nbits;

	if (val == 0) {
		put_bits(&s->pb, huff_size[0], huff_code[0]);
	} else {
		mant = val;
		if (val < 0) {
			val = -val;
			mant--;
		}
		nbits= av_log2_16bit(val) + 1;
		put_bits(&s->pb, huff_size[nbits], huff_code[nbits]);
		put_bits(&s->pb, nbits, mant & ((1 << nbits) - 1));
	}
}

/// Huffman encode and emit one DCT block into the MJPEG code stream
/**
 * \param s pointer to MpegEncContext structure
 * \param block pointer to the DCT block to emit
 * \param n
 *
 * This routine is a duplicate of encode_block in mjpeg.c
 */
static void encode_block(MpegEncContext *s, DCTELEM *block, int n) {
	int mant, nbits, code, i, j;
	int component, dc, run, last_index, val;
	MJpegContext *m = s->mjpeg_ctx;
	uint8_t *huff_size_ac;
	uint16_t *huff_code_ac;

	/* DC coef */
	component = (n <= 3 ? 0 : n - 4 + 1);
	dc = block[0]; /* overflow is impossible */
	val = dc - s->last_dc[component];
	if (n < 4) {
		encode_dc(s, val, m->huff_size_dc_luminance,
				m->huff_code_dc_luminance);
		huff_size_ac = m->huff_size_ac_luminance;
		huff_code_ac = m->huff_code_ac_luminance;
	} else {
		encode_dc(s, val, m->huff_size_dc_chrominance,
				m->huff_code_dc_chrominance);
		huff_size_ac = m->huff_size_ac_chrominance;
		huff_code_ac = m->huff_code_ac_chrominance;
	}
	s->last_dc[component] = dc;

	/* AC coefs */

	run = 0;
	last_index = s->block_last_index[n];
	for (i = 1; i <= last_index; i++) {
		j = s->intra_scantable.permutated[i];
		val = block[j];
		if (val == 0) run++;
		else {
			while (run >= 16) {
				put_bits(&s->pb, huff_size_ac[0xf0],
						huff_code_ac[0xf0]);
				run -= 16;
			}
			mant = val;
			if (val < 0) {
				val = -val;
				mant--;
			}

			nbits= av_log2_16bit(val) + 1;
			code = (run << 4) | nbits;

			put_bits(&s->pb, huff_size_ac[code],
					huff_code_ac[code]);
			put_bits(&s->pb, nbits, mant & ((1 << nbits) - 1));
			run = 0;
		}
	}

	/* output EOB only if not already 64 values */
	if (last_index < 63 || run != 0)
		put_bits(&s->pb, huff_size_ac[0], huff_code_ac[0]);
}

/// clip overflowing DCT coefficients
/**
 * If the computed DCT coefficients in a block overflow, this routine
 * will go through them and clip them to be in the valid range.
 *
 * \param s pointer to MpegEncContext
 * \param block pointer to DCT block to process
 * \param last_index index of the last non-zero coefficient in block
 *
 * The max and min level, which are clipped to, are stored in
 * s->min_qcoeff and s->max_qcoeff respectively.
 */
static inline void clip_coeffs(MpegEncContext *s, DCTELEM *block,
		int last_index) {
	int i;
	const int maxlevel= s->max_qcoeff;
	const int minlevel= s->min_qcoeff;

	for (i = 0; i <= last_index; i++) {
		const int j = s->intra_scantable.permutated[i];
		int level = block[j];

		if (level > maxlevel) level=maxlevel;
		else if(level < minlevel) level=minlevel;
		block[j]= level;
	}
}

/* End excessive code duplication **************************************/

typedef struct {
	struct MpegEncContext *s;
	int cheap_upsample;
	int bw;
	int y_rs;
	int u_rs;
	int v_rs;
} jpeg_enc_t;

// Huffman encode and emit one MCU of MJPEG code
/**
 * \param j pointer to jpeg_enc_t structure
 *
 * This function huffman encodes one MCU, and emits the
 * resulting bitstream into the MJPEG code that is currently worked on.
 *
 * this function is a reproduction of the one in mjpeg, it includes two
 * changes, it allows for black&white encoding (it skips the U and V
 * macroblocks and it outputs the huffman code for 'no change' (dc) and
 * 'all zero' (ac)) and it takes 4 macroblocks (422) instead of 6 (420)
 */
static av_always_inline void zr_mjpeg_encode_mb(jpeg_enc_t *j) {

	MJpegContext *m = j->s->mjpeg_ctx;

	encode_block(j->s, j->s->block[0], 0);
	encode_block(j->s, j->s->block[1], 1);
	if (j->bw) {
		/* U */
		put_bits(&j->s->pb, m->huff_size_dc_chrominance[0],
				m->huff_code_dc_chrominance[0]);
		put_bits(&j->s->pb, m->huff_size_ac_chrominance[0],
				m->huff_code_ac_chrominance[0]);
		/* V */
		put_bits(&j->s->pb, m->huff_size_dc_chrominance[0],
				m->huff_code_dc_chrominance[0]);
		put_bits(&j->s->pb, m->huff_size_ac_chrominance[0],
				m->huff_code_ac_chrominance[0]);
	} else {
		/* we trick encode_block here so that it uses
		 * chrominance huffman tables instead of luminance ones
		 * (see the effect of second argument of encode_block) */
		encode_block(j->s, j->s->block[2], 4);
		encode_block(j->s, j->s->block[3], 5);
	}
}

/// Fill one DCT MCU from planar storage
/**
 * This routine will convert one MCU from YUYV planar storage into 4
 * DCT macro blocks, converting from 8-bit format in the planar
 * storage to 16-bit format used in the DCT.
 *
 * \param j pointer to jpeg_enc structure, and also storage for DCT macro blocks
 * \param x pixel x-coordinate for the first pixel
 * \param y pixel y-coordinate for the first pixel
 * \param y_data pointer to the Y plane
 * \param u_data pointer to the U plane
 * \param v_data pointer to the V plane
 */
static av_always_inline void fill_block(jpeg_enc_t *j, int x, int y,
		unsigned char *y_data, unsigned char *u_data,
		unsigned char *v_data)
{
	int i, k;
	short int *dest;
	unsigned char *source;

	// The first Y, Y0
	get_pixels(j->s->block[0], y*8*j->y_rs + 16*x + y_data, j->y_rs);
	// The second Y, Y1
	get_pixels(j->s->block[1], y*8*j->y_rs + 16*x + 8 + y_data, j->y_rs);

	if (!j->bw && j->cheap_upsample) {
		source = y * 4 * j->u_rs + 8*x + u_data;
		dest = j->s->block[2];
		for (i = 0; i < 4; i++) {
			for (k = 0; k < 8; k++) {
				dest[k] = source[k];   // First row
				dest[k+8] = source[k]; // Duplicate to next row

			}
			dest += 16;
			source += j->u_rs;
		}
		source = y * 4 * j->v_rs + 8*x + v_data;
		dest = j->s->block[3];
		for (i = 0; i < 4; i++) {
			for (k = 0; k < 8; k++) {
				dest[k] = source[k];
				dest[k+8] = source[k];
			}
			dest += 16;
			source += j->u_rs;
		}
	} else if (!j->bw && !j->cheap_upsample) {
		// U
		get_pixels(j->s->block[2], y*8*j->u_rs + 8*x + u_data, j->u_rs);
		// V
		get_pixels(j->s->block[3], y*8*j->v_rs + 8*x + v_data, j->v_rs);
	}
}

/**
 * \brief initialize mjpeg encoder
 *
 * This routine is to set up the parameters and initialize the mjpeg encoder.
 * It does all the initializations needed of lower level routines.
 * The formats accepted by this encoder is YUV422P and YUV420
 *
 * \param w width in pixels of the image to encode, must be a multiple of 16
 * \param h height in pixels of the image to encode, must be a multiple of 8
 * \param y_rsize size of each plane row Y component
 * \param y_rsize size of each plane row U component
 * \param v_rsize size of each plane row V component
 * \param cu "cheap upsample". Set to 0 for YUV422 format, 1 for YUV420 format
 *           when set to 1, the encoder will assume that there is only half th
 *           number of rows of chroma information, and every chroma row is
 *           duplicated.
 * \param q quality parameter for the mjpeg encode. Between 1 and 20 where 1
 *	    is best quality and 20 is the worst quality.
 * \param b monochrome flag. When set to 1, the mjpeg output is monochrome.
 *          In that case, the colour information is omitted, and actually the
 *          colour planes are not touched.
 *
 * \returns an appropriately set up jpeg_enc_t structure
 *
 * The actual plane buffer addreses are passed by jpeg_enc_frame().
 *
 * The encoder doesn't know anything about interlacing, the halve height
 * needs to be passed and the double rowstride. Which field gets encoded
 * is decided by what buffers are passed to mjpeg_encode_frame()
 */
static jpeg_enc_t *jpeg_enc_init(int w, int h, int y_rsize,
			  int u_rsize, int v_rsize,
		int cu, int q, int b) {
	jpeg_enc_t *j;
	int i = 0;
	VERBOSE("JPEG encoder init: %dx%d %d %d %d cu=%d q=%d bw=%d\n",
			w, h, y_rsize, u_rsize, v_rsize, cu, q, b);

	j = av_mallocz(sizeof(jpeg_enc_t));
	if (j == NULL) return NULL;

	j->s = av_mallocz(sizeof(MpegEncContext));
	if (j->s == NULL) {
		av_free(j);
		return NULL;
	}

	/* info on how to access the pixels */
	j->y_rs = y_rsize;
	j->u_rs = u_rsize;
	j->v_rs = v_rsize;

	j->s->width = w;		// image width and height
	j->s->height = h;
	j->s->qscale = q;		// Encoding quality

	j->s->out_format = FMT_MJPEG;
	j->s->intra_only = 1;		// Generate only intra pictures for jpeg
	j->s->encoding = 1;		// Set mode to encode
	j->s->pict_type = FF_I_TYPE;
	j->s->y_dc_scale = 8;
	j->s->c_dc_scale = 8;

	/*
	 * This sets up the MCU (Minimal Code Unit) number
	 * of appearances of the various component
	 * for the SOF0 table in the generated MJPEG.
	 * The values are not used for anything else.
	 * The current setup is simply YUV422, with two horizontal Y components
	 * for every UV component.
	 */
	//FIXME j->s->mjpeg_write_tables = 1;	// setup to write tables
	j->s->mjpeg_vsample[0] = 1;	// 1 appearance of Y vertically
	j->s->mjpeg_vsample[1] = 1;	// 1 appearance of U vertically
	j->s->mjpeg_vsample[2] = 1;	// 1 appearance of V vertically
	j->s->mjpeg_hsample[0] = 2;	// 2 appearances of Y horizontally
	j->s->mjpeg_hsample[1] = 1;	// 1 appearance of U horizontally
	j->s->mjpeg_hsample[2] = 1;	// 1 appearance of V horizontally

	j->cheap_upsample = cu;
	j->bw = b;

	// Is this needed?
	/* if libavcodec is used by the decoder then we must not
	 * initialize again, but if it is not initialized then we must
	 * initialize it here. */
	if (!avcodec_initialized) {
		avcodec_init();
		avcodec_register_all();
		avcodec_initialized=1;
	}

	// Build mjpeg huffman code tables, setting up j->s->mjpeg_ctx
	if (ff_mjpeg_encode_init(j->s) < 0) {
		av_free(j->s);
		av_free(j);
		return NULL;
	}

	/* alloc bogus avctx to keep MPV_common_init from segfaulting */
	j->s->avctx = avcodec_alloc_context();
	if (j->s->avctx == NULL) {
		av_free(j->s);
		av_free(j);
		return NULL;
	}

	// Set some a minimum amount of default values that are needed
	// Indicates that we should generated normal MJPEG
	j->s->avctx->codec_id = CODEC_ID_MJPEG;
	// Which DCT method to use. AUTO will select the fastest one
	j->s->avctx->dct_algo = FF_DCT_AUTO;
	j->s->intra_quant_bias= 1<<(QUANT_BIAS_SHIFT-1); //(a + x/2)/x

	j->s->avctx->thread_count = 1;

	/* make MPV_common_init allocate important buffers, like s->block
	 * Also initializes dsputil */
	if (MPV_common_init(j->s) < 0) {
		av_free(j->s);
		av_free(j);
		return NULL;
	}

	/* correct the value for sc->mb_height. MPV_common_init put other
	 * values there */
	j->s->mb_height = j->s->height/8;
	j->s->mb_intra = 1;

	// Init q matrix
	j->s->intra_matrix[0] = ff_mpeg1_default_intra_matrix[0];
	for (i = 1; i < 64; i++)
		j->s->intra_matrix[i] = av_clip_uint8(
			(ff_mpeg1_default_intra_matrix[i]*j->s->qscale) >> 3);

	// precompute matrix
	convert_matrix(j->s, j->s->q_intra_matrix, j->s->q_intra_matrix16,
			j->s->intra_matrix, j->s->intra_quant_bias, 8, 8);

	/* Pick up the selection of the optimal get_pixels() routine
	 * to use, which was done in  MPV_common_init() */
	get_pixels = j->s->dsp.get_pixels;

	return j;
}

/**
 * \brief mjpeg encode an image
 *
 * This routine will take a 3-plane YUV422 image and encoded it with MJPEG
 * base line format, as suitable as input for the Zoran hardare MJPEG chips.
 *
 * It requires that the \a j parameter points the structure set up by the
 * jpeg_enc_init() routine.
 *
 * \param j pointer to jpeg_enc_t structure as created by jpeg_enc_init()
 * \param y_data pointer to Y component plane, packed one byte/pixel
 * \param u_data pointer to U component plane, packed one byte per every
 *		 other pixel
 * \param v_data pointer to V component plane, packed one byte per every
 *		 other pixel
 * \param bufr pointer to the buffer where the mjpeg encoded code is stored
 *
 * \returns the number of bytes stored into \a bufr
 *
 * If \a j->s->mjpeg_write_tables is set, it will also emit the mjpeg tables,
 * otherwise it will just emit the data. The \a j->s->mjpeg_write_tables
 * variable will be reset to 0 by the routine.
 */
static int jpeg_enc_frame(jpeg_enc_t *j, uint8_t *y_data,
		   uint8_t *u_data, uint8_t *v_data, uint8_t *bufr) {
	int mb_x, mb_y, overflow;
	/* initialize the buffer */

	init_put_bits(&j->s->pb, bufr, 1024*256);

	// Emit the mjpeg header blocks
	ff_mjpeg_encode_picture_header(j->s);

	j->s->header_bits = put_bits_count(&j->s->pb);

	j->s->last_dc[0] = 128;
	j->s->last_dc[1] = 128;
	j->s->last_dc[2] = 128;

	for (mb_y = 0; mb_y < j->s->mb_height; mb_y++) {
		for (mb_x = 0; mb_x < j->s->mb_width; mb_x++) {
			/*
			 * Fill one DCT block (8x8 pixels) from
			 * 2 Y macroblocks and one U and one V
			 */
			fill_block(j, mb_x, mb_y, y_data, u_data, v_data);
			emms_c(); /* is this really needed? */

			j->s->block_last_index[0] =
				j->s->dct_quantize(j->s, j->s->block[0],
						0, 8, &overflow);
			if (overflow) clip_coeffs(j->s, j->s->block[0],
					j->s->block_last_index[0]);
			j->s->block_last_index[1] =
				j->s->dct_quantize(j->s, j->s->block[1],
						1, 8, &overflow);
			if (overflow) clip_coeffs(j->s, j->s->block[1],
					j->s->block_last_index[1]);

			if (!j->bw) {
				j->s->block_last_index[4] =
					j->s->dct_quantize(j->s, j->s->block[2],
							4, 8, &overflow);
				if (overflow) clip_coeffs(j->s, j->s->block[2],
						j->s->block_last_index[2]);
				j->s->block_last_index[5] =
					j->s->dct_quantize(j->s, j->s->block[3],
							5, 8, &overflow);
				if (overflow) clip_coeffs(j->s, j->s->block[3],
						j->s->block_last_index[3]);
			}
			zr_mjpeg_encode_mb(j);
		}
	}
	emms_c();
	ff_mjpeg_encode_picture_trailer(j->s);
	flush_put_bits(&j->s->pb);

	//FIXME
	//if (j->s->mjpeg_write_tables == 1)
	//	j->s->mjpeg_write_tables = 0;

	return pbBufPtr(&(j->s->pb)) - j->s->pb.buf;
}

/// the real uninit routine
/**
 * This is the real routine that does the uninit of the ZRMJPEG filter
 *
 * \param j pointer to jpeg_enc structure
 */
static void jpeg_enc_uninit(jpeg_enc_t *j) {
	ff_mjpeg_encode_close(j->s);
	av_free(j->s);
	av_free(j);
}

/// Private structure for ZRMJPEG filter
struct vf_priv_s {
	jpeg_enc_t *j;
	unsigned char buf[256*1024];
	int bw, fd, hdec, vdec;
	int fields;
	int y_stride;
	int c_stride;
	int quality;
	int maxwidth;
	int maxheight;
};

/// vf CONFIGURE entry point for the ZRMJPEG filter
/**
 * \param vf video filter instance pointer
 * \param width image source width in pixels
 * \param height image source height in pixels
 * \param d_width width of requested window, just a hint
 * \param d_height height of requested window, just a hint
 * \param flags vf filter flags
 * \param outfmt
 *
 * \returns returns 0 on error
 *
 * This routine will make the necessary hardware-related decisions for
 * the ZRMJPEG filter, do the initialization of the MJPEG encoder, and
 * then select one of the ZRJMJPEGIT or ZRMJPEGNI filters and then
 * arrange to dispatch to the config() entry pointer for the one
 * selected.
 */
static int config(struct vf_instance_s* vf, int width, int height, int d_width,
		int d_height, unsigned int flags, unsigned int outfmt){
	struct vf_priv_s *priv = vf->priv;
	float aspect_decision;
	int stretchx, stretchy, err = 0, maxstretchx = 4;
	priv->fields = 1;

	VERBOSE("config() called\n");

	if (priv->j) {
		VERBOSE("re-configuring, resetting JPEG encoder\n");
		jpeg_enc_uninit(priv->j);
		priv->j = NULL;
	}

	aspect_decision = ((float)d_width/(float)d_height)/
		((float)width/(float)height);

	if (aspect_decision > 1.8 && aspect_decision < 2.2) {
		VERBOSE("should correct aspect by stretching x times 2, %d %d\n", 2*width, priv->maxwidth);
		if (2*width <= priv->maxwidth) {
			d_width = 2*width;
			d_height = height;
			maxstretchx = 2;
		} else {
			WARNING("unable to correct aspect by stretching, because resulting X will be too large, aspect correction by decimating y not yet implemented\n");
			d_width = width;
			d_height = height;
		}
		/* prestretch movie */
	} else {
		/* uncorrecting output for now */
		d_width = width;
		d_height = height;
	}
	/* make the scaling decision
	 * we are capable of stretching the image in the horizontal
	 * direction by factors 1, 2 and 4
	 * we can stretch the image in the vertical direction by a
	 * factor of 1 and 2 AND we must decide about interlacing */
	if (d_width > priv->maxwidth/2 || height > priv->maxheight/2
			|| maxstretchx == 1) {
		stretchx = 1;
		stretchy = 1;
		priv->fields = 2;
		if (priv->vdec == 2) {
			priv->fields = 1;
		} else if (priv->vdec == 4) {
			priv->fields = 1;
			stretchy = 2;
		}
		if (priv->hdec > maxstretchx) {
			if (priv->fd) {
				WARNING("horizontal decimation too high, "
						"changing to %d (use fd to keep"
						" hdec=%d)\n",
						maxstretchx, priv->hdec);
				priv->hdec = maxstretchx;
			}
		}
		stretchx = priv->hdec;
	} else if (d_width > priv->maxwidth/4 ||
			height > priv->maxheight/4 ||
			maxstretchx == 2) {
		stretchx = 2;
		stretchy = 1;
		priv->fields = 1;
		if (priv->vdec == 2) {
			stretchy = 2;
		} else if (priv->vdec == 4) {
			if (!priv->fd) {
				WARNING("vertical decimation too high, "
						"changing to 2 (use fd to keep "
						"vdec=4)\n");
				priv->vdec = 2;
			}
			stretchy = 2;
		}
		if (priv->hdec == 2) {
			stretchx = 4;
		} else if (priv->hdec == 4) {
			if (priv->fd) {
				WARNING("horizontal decimation too high, "
						"changing to 2 (use fd to keep "
						"hdec=4)\n");
				priv->hdec = 2;
			}
			stretchx = 4;
		}
	} else {
		/* output image is maximally stretched */
		stretchx = 4;
		stretchy = 2;
		priv->fields = 1;
		if (priv->vdec != 1 && !priv->fd) {
			WARNING("vertical decimation too high, changing to 1 "
					"(use fd to keep vdec=%d)\n",
					priv->vdec);
			priv->vdec = 1;
		}
		if (priv->hdec != 1 && !priv->fd) {
			WARNING("horizontal decimation too high, changing to 1 (use fd to keep hdec=%d)\n", priv->hdec);
			priv->hdec = 1;
		}
	}

	VERBOSE("generated JPEG's %dx%s%d%s, stretched to %dx%d\n",
			width/priv->hdec, (priv->fields == 2) ? "(" : "",
			height/(priv->vdec*priv->fields),
			(priv->fields == 2) ? "x2)" : "",
			(width/priv->hdec)*stretchx,
			(height/(priv->vdec*priv->fields))*
			stretchy*priv->fields);


	if ((width/priv->hdec)*stretchx > priv->maxwidth ||
			(height/(priv->vdec*priv->fields))*
			 stretchy*priv->fields  > priv->maxheight) {
		ERROR("output dimensions too large (%dx%d), max (%dx%d) "
				"insert crop to fix\n",
				(width/priv->hdec)*stretchx,
				(height/(priv->vdec*priv->fields))*
				stretchy*priv->fields,
				priv->maxwidth, priv->maxheight);
		err = 1;
	}

	if (width%(16*priv->hdec) != 0) {
		ERROR("width must be a multiple of 16*hdec (%d), use expand\n",
				priv->hdec*16);
		err = 1;
	}

	if (height%(8*priv->fields*priv->vdec) != 0) {
		ERROR("height must be a multiple of 8*fields*vdec (%d),"
				" use expand\n", priv->vdec*priv->fields*8);
		err = 1;
	}

	if (err) return 0;

	priv->y_stride = width;
	priv->c_stride = width/2;
	priv->j = jpeg_enc_init(width, height/priv->fields,
				priv->fields*priv->y_stride,
				priv->fields*priv->c_stride,
				priv->fields*priv->c_stride,
				1, priv->quality, priv->bw);

	if (!priv->j) return 0;
	return vf_next_config(vf, width, height, d_width, d_height, flags,
		(priv->fields == 2) ? IMGFMT_ZRMJPEGIT : IMGFMT_ZRMJPEGNI);
}

/// put_image entrypoint for the ZRMJPEG vf filter
/***
 * \param vf pointer to vf_instance
 * \param mpi pointer to mp_image_t structure
 * \param pts
 */
static int put_image(struct vf_instance_s* vf, mp_image_t *mpi, double pts){
	struct vf_priv_s *priv = vf->priv;
	int size = 0;
	int i;
	mp_image_t* dmpi;
	for (i = 0; i < priv->fields; i++)
		size += jpeg_enc_frame(priv->j,
				mpi->planes[0] + i*priv->y_stride,
				mpi->planes[1] + i*priv->c_stride,
				mpi->planes[2] + i*priv->c_stride,
				priv->buf + size);

	dmpi = vf_get_image(vf->next, IMGFMT_ZRMJPEGNI,
			MP_IMGTYPE_EXPORT, 0, mpi->w, mpi->h);
	dmpi->planes[0] = (uint8_t*)priv->buf;
	dmpi->planes[1] = (uint8_t*)size;
	return vf_next_put_image(vf,dmpi, pts);
}

/// query_format entrypoint for the ZRMJPEG vf filter
/***
 * \param vf pointer to vf_instance
 * \param fmt image format to query for
 *
 * \returns 0 if image format in fmt is not supported
 *
 * Given the image format specified by \a fmt, this routine is called
 * to ask if the format is supported or not.
 */
static int query_format(struct vf_instance_s* vf, unsigned int fmt){
	VERBOSE("query_format() called\n");

	switch (fmt) {
		case IMGFMT_YV12:
		case IMGFMT_YUY2:
			/* strictly speaking the output format of
			 * this filter will be known after config(),
			 * but everything that supports IMGFMT_ZRMJPEGNI
			 * should also support all other IMGFMT_ZRMJPEG* */
			return vf_next_query_format(vf, IMGFMT_ZRMJPEGNI);
	}

	return 0;
}

/// vf UNINIT entry point for the ZRMJPEG filter
/**
 * \param vf pointer to the vf instance structure
 */
static void uninit(vf_instance_t *vf) {
	struct vf_priv_s *priv = vf->priv;
	VERBOSE("uninit() called\n");
	if (priv->j) jpeg_enc_uninit(priv->j);
	free(priv);
}

/// vf OPEN entry point for the ZRMJPEG filter
/**
 * \param vf pointer to the vf instance structure
 * \param args the argument list string for the -vf zrmjpeg command
 *
 * \returns 0 for error, 1 for success
 *
 * This routine will do some basic initialization of local structures etc.,
 * and then parse the command line arguments specific for the ZRMJPEG filter.
 */
static int open(vf_instance_t *vf, char* args){
	struct vf_priv_s *priv;
	VERBOSE("open() called: args=\"%s\"\n", args);

	vf->config = config;
	vf->put_image = put_image;
	vf->query_format = query_format;
	vf->uninit = uninit;

	priv = vf->priv = calloc(sizeof(*priv), 1);
	if (!vf->priv) {
		ERROR("out of memory error\n");
		return 0;
	}

	/* maximum displayable size by zoran card, these defaults
	 * are for my own zoran card in PAL mode, these can be changed
	 * by filter options. But... in an ideal world these values would
	 * be queried from the vo device itself... */
	priv->maxwidth = 768;
	priv->maxheight = 576;

	priv->quality = 2;
	priv->hdec = 1;
	priv->vdec = 1;

	/* if libavcodec is already initialized, we must not initialize it
	 * again, but if it is not initialized then we mustinitialize it now. */
	if (!avcodec_initialized) {
		/* we need to initialize libavcodec */
		avcodec_init();
		avcodec_register_all();
		avcodec_initialized=1;
	}

	if (args) {
		char *arg, *tmp, *ptr, junk;
		int last = 0, input;

		/* save arguments, to be able to safely modify them */
		arg = strdup(args);
		if (!arg) {
			ERROR("out of memory, this is bad\n");
			return 0;
		}

		tmp = ptr = arg;
		do {
			while (*tmp != ':' && *tmp) tmp++;
			if (*tmp == ':') *tmp++ = '\0';
			else last = 1;
			VERBOSE("processing filter option \"%s\"\n", ptr);
			/* These options deal with the maximum output
			 * resolution of the zoran card. These should
			 * be queried from the vo device, but it is currently
			 * too difficult, so the user should tell the filter */
			if (!strncmp("maxheight=", ptr, 10)) {
				if (sscanf(ptr+10, "%d%c", &input, &junk) != 1)
						ERROR(
		"error parsing parameter to \"maxheight=\", \"%s\", ignoring\n"
								, ptr + 10);
				else {
					priv->maxheight = input;
					VERBOSE("setting maxheight to %d\n",
							priv->maxheight);
				}
			} else if (!strncmp("quality=", ptr, 8)) {
				if (sscanf(ptr+8, "%d%c", &input, &junk) != 1)
					ERROR(
		"error parsing parameter to \"quality=\", \"%s\", ignoring\n"
								, ptr + 8);
				else if (input < 1 || input > 20)
					ERROR(
		"parameter to \"quality=\" out of range (1..20), %d\n", input);
				else {
					priv->quality = input;
					VERBOSE("setting JPEG quality to %d\n",
							priv->quality);
				}
			} else if (!strncmp("maxwidth=", ptr, 9)) {
				if (sscanf(ptr+9, "%d%c", &input, &junk) != 1)
					ERROR(
		"error parsing parameter to \"maxwidth=\", \"%s\", ignoring\n"
								, ptr + 9);
				else {
					priv->maxwidth = input;
					VERBOSE("setting maxwidth to %d\n",
							priv->maxwidth);
				}
			} else if (!strncmp("hdec=", ptr, 5)) {
				if (sscanf(ptr+5, "%d%c", &input, &junk) != 1)
					ERROR(
		"error parsing parameter to \"hdec=\", \"%s\", ignoring\n"
								, ptr + 9);
				else if (input != 1 && input != 2 && input != 4)
					ERROR(
		"illegal parameter to \"hdec=\", %d, should be 1, 2 or 4",
								input);
				else {
					priv->hdec = input;
					VERBOSE(
		"setting horizontal decimation to %d\n", priv->maxwidth);
				}
			} else if (!strncmp("vdec=", ptr, 5)) {
				if (sscanf(ptr+5, "%d%c", &input, &junk) != 1)
					ERROR(
		"error parsing parameter to \"vdec=\", \"%s\", ignoring\n"
								, ptr + 9);
				else if (input != 1 && input != 2 && input != 4)
					ERROR(
		"illegal parameter to \"vdec=\", %d, should be 1, 2 or 4",
								input);
				else {
					priv->vdec = input;
					VERBOSE(
			"setting vertical decimation to %d\n", priv->maxwidth);
				}
			} else if (!strcasecmp("dc10+-PAL", ptr) ||
					!strcasecmp("dc10-PAL", ptr)) {
				priv->maxwidth = 768;
				priv->maxheight = 576;
				VERBOSE("setting DC10(+) PAL profile\n");
			} else if (!strcasecmp("fd", ptr)) {
				priv->fd = 1;
				VERBOSE("forcing decimation\n");
			} else if (!strcasecmp("nofd", ptr)) {
				priv->fd = 0;
				VERBOSE("decimate only if beautiful\n");
			} else if (!strcasecmp("bw", ptr)) {
				priv->bw = 1;
				VERBOSE("setting black and white encoding\n");
			} else if (!strcasecmp("color", ptr)) {
				priv->bw = 0;
				VERBOSE("setting color encoding\n");
			} else if (!strcasecmp("dc10+-NTSC", ptr) ||
					!strcasecmp("dc10-NTSC", ptr)) {
				priv->maxwidth = 640;
				priv->maxheight = 480;
				VERBOSE("setting DC10(+) NTSC profile\n");
			} else if (!strcasecmp("buz-PAL", ptr) ||
					!strcasecmp("lml33-PAL", ptr)) {
				priv->maxwidth = 720;
				priv->maxheight = 576;
				VERBOSE("setting buz/lml33 PAL profile\n");
			} else if (!strcasecmp("buz-NTSC", ptr) ||
					!strcasecmp("lml33-NTSC", ptr)) {
				priv->maxwidth = 720;
				priv->maxheight = 480;
				VERBOSE("setting buz/lml33 NTSC profile\n");
			} else {
				WARNING("ignoring unknown filter option "
						"\"%s\", or missing argument\n",
						ptr);
			}
			ptr = tmp;
		} while (!last);

		free(arg);
	}


	return 1;
}

const vf_info_t vf_info_zrmjpeg = {
    "realtime zoran MJPEG encoding",
    "zrmjpeg",
    "Rik Snel",
    "",
    open,
    NULL
};