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ffmpeg / libavcodec / mjpegenc.c @ 4922a5b0

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1
/*
2
 * MJPEG encoder
3
 * Copyright (c) 2000, 2001 Fabrice Bellard.
4
 * Copyright (c) 2003 Alex Beregszaszi
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 * Copyright (c) 2003-2004 Michael Niedermayer
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 *
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 * This file is part of FFmpeg.
8
 *
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 * FFmpeg is free software; you can redistribute it and/or
10
 * modify it under the terms of the GNU Lesser General Public
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 * License as published by the Free Software Foundation; either
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 * version 2.1 of the License, or (at your option) any later version.
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 *
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 * FFmpeg is distributed in the hope that it will be useful,
15
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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 * Lesser General Public License for more details.
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 *
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 * You should have received a copy of the GNU Lesser General Public
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 * License along with FFmpeg; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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 *
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 * Support for external huffman table, various fixes (AVID workaround),
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 * aspecting, new decode_frame mechanism and apple mjpeg-b support
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 *                                  by Alex Beregszaszi
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 */
27

    
28
/**
29
 * @file mjpegenc.c
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 * MJPEG encoder.
31
 */
32

    
33
//#define DEBUG
34
#include <assert.h>
35

    
36
#include "avcodec.h"
37
#include "dsputil.h"
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#include "mpegvideo.h"
39
#include "mjpeg.h"
40

    
41
/* use two quantizer tables (one for luminance and one for chrominance) */
42
/* not yet working */
43
#undef TWOMATRIXES
44

    
45
typedef struct MJpegContext {
46
    uint8_t huff_size_dc_luminance[12]; //FIXME use array [3] instead of lumi / chrom, for easier addressing
47
    uint16_t huff_code_dc_luminance[12];
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    uint8_t huff_size_dc_chrominance[12];
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    uint16_t huff_code_dc_chrominance[12];
50

    
51
    uint8_t huff_size_ac_luminance[256];
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    uint16_t huff_code_ac_luminance[256];
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    uint8_t huff_size_ac_chrominance[256];
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    uint16_t huff_code_ac_chrominance[256];
55
} MJpegContext;
56

    
57

    
58
int mjpeg_init(MpegEncContext *s)
59
{
60
    MJpegContext *m;
61

    
62
    m = av_malloc(sizeof(MJpegContext));
63
    if (!m)
64
        return -1;
65

    
66
    s->min_qcoeff=-1023;
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    s->max_qcoeff= 1023;
68

    
69
    /* build all the huffman tables */
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    build_huffman_codes(m->huff_size_dc_luminance,
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                        m->huff_code_dc_luminance,
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                        bits_dc_luminance,
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                        val_dc_luminance);
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    build_huffman_codes(m->huff_size_dc_chrominance,
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                        m->huff_code_dc_chrominance,
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                        bits_dc_chrominance,
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                        val_dc_chrominance);
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    build_huffman_codes(m->huff_size_ac_luminance,
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                        m->huff_code_ac_luminance,
80
                        bits_ac_luminance,
81
                        val_ac_luminance);
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    build_huffman_codes(m->huff_size_ac_chrominance,
83
                        m->huff_code_ac_chrominance,
84
                        bits_ac_chrominance,
85
                        val_ac_chrominance);
86

    
87
    s->mjpeg_ctx = m;
88
    return 0;
89
}
90

    
91
void mjpeg_close(MpegEncContext *s)
92
{
93
    av_free(s->mjpeg_ctx);
94
}
95

    
96
/* table_class: 0 = DC coef, 1 = AC coefs */
97
static int put_huffman_table(MpegEncContext *s, int table_class, int table_id,
98
                             const uint8_t *bits_table, const uint8_t *value_table)
99
{
100
    PutBitContext *p = &s->pb;
101
    int n, i;
102

    
103
    put_bits(p, 4, table_class);
104
    put_bits(p, 4, table_id);
105

    
106
    n = 0;
107
    for(i=1;i<=16;i++) {
108
        n += bits_table[i];
109
        put_bits(p, 8, bits_table[i]);
110
    }
111

    
112
    for(i=0;i<n;i++)
113
        put_bits(p, 8, value_table[i]);
114

    
115
    return n + 17;
116
}
117

    
118
static void jpeg_table_header(MpegEncContext *s)
119
{
120
    PutBitContext *p = &s->pb;
121
    int i, j, size;
122
    uint8_t *ptr;
123

    
124
    /* quant matrixes */
125
    put_marker(p, DQT);
126
#ifdef TWOMATRIXES
127
    put_bits(p, 16, 2 + 2 * (1 + 64));
128
#else
129
    put_bits(p, 16, 2 + 1 * (1 + 64));
130
#endif
131
    put_bits(p, 4, 0); /* 8 bit precision */
132
    put_bits(p, 4, 0); /* table 0 */
133
    for(i=0;i<64;i++) {
134
        j = s->intra_scantable.permutated[i];
135
        put_bits(p, 8, s->intra_matrix[j]);
136
    }
137
#ifdef TWOMATRIXES
138
    put_bits(p, 4, 0); /* 8 bit precision */
139
    put_bits(p, 4, 1); /* table 1 */
140
    for(i=0;i<64;i++) {
141
        j = s->intra_scantable.permutated[i];
142
        put_bits(p, 8, s->chroma_intra_matrix[j]);
143
    }
144
#endif
145

    
146
    /* huffman table */
147
    put_marker(p, DHT);
148
    flush_put_bits(p);
149
    ptr = pbBufPtr(p);
150
    put_bits(p, 16, 0); /* patched later */
151
    size = 2;
152
    size += put_huffman_table(s, 0, 0, bits_dc_luminance, val_dc_luminance);
153
    size += put_huffman_table(s, 0, 1, bits_dc_chrominance, val_dc_chrominance);
154

    
155
    size += put_huffman_table(s, 1, 0, bits_ac_luminance, val_ac_luminance);
156
    size += put_huffman_table(s, 1, 1, bits_ac_chrominance, val_ac_chrominance);
157
    ptr[0] = size >> 8;
158
    ptr[1] = size;
159
}
160

    
161
static void jpeg_put_comments(MpegEncContext *s)
162
{
163
    PutBitContext *p = &s->pb;
164
    int size;
165
    uint8_t *ptr;
166

    
167
    if (s->aspect_ratio_info /* && !lossless */)
168
    {
169
    /* JFIF header */
170
    put_marker(p, APP0);
171
    put_bits(p, 16, 16);
172
    ff_put_string(p, "JFIF", 1); /* this puts the trailing zero-byte too */
173
    put_bits(p, 16, 0x0201); /* v 1.02 */
174
    put_bits(p, 8, 0); /* units type: 0 - aspect ratio */
175
    put_bits(p, 16, s->avctx->sample_aspect_ratio.num);
176
    put_bits(p, 16, s->avctx->sample_aspect_ratio.den);
177
    put_bits(p, 8, 0); /* thumbnail width */
178
    put_bits(p, 8, 0); /* thumbnail height */
179
    }
180

    
181
    /* comment */
182
    if(!(s->flags & CODEC_FLAG_BITEXACT)){
183
        put_marker(p, COM);
184
        flush_put_bits(p);
185
        ptr = pbBufPtr(p);
186
        put_bits(p, 16, 0); /* patched later */
187
        ff_put_string(p, LIBAVCODEC_IDENT, 1);
188
        size = strlen(LIBAVCODEC_IDENT)+3;
189
        ptr[0] = size >> 8;
190
        ptr[1] = size;
191
    }
192

    
193
    if(  s->avctx->pix_fmt == PIX_FMT_YUV420P
194
       ||s->avctx->pix_fmt == PIX_FMT_YUV422P
195
       ||s->avctx->pix_fmt == PIX_FMT_YUV444P){
196
        put_marker(p, COM);
197
        flush_put_bits(p);
198
        ptr = pbBufPtr(p);
199
        put_bits(p, 16, 0); /* patched later */
200
        ff_put_string(p, "CS=ITU601", 1);
201
        size = strlen("CS=ITU601")+3;
202
        ptr[0] = size >> 8;
203
        ptr[1] = size;
204
    }
205
}
206

    
207
void mjpeg_picture_header(MpegEncContext *s)
208
{
209
    const int lossless= s->avctx->codec_id != CODEC_ID_MJPEG;
210

    
211
    put_marker(&s->pb, SOI);
212

    
213
    jpeg_put_comments(s);
214

    
215
    jpeg_table_header(s);
216

    
217
    switch(s->avctx->codec_id){
218
    case CODEC_ID_MJPEG:  put_marker(&s->pb, SOF0 ); break;
219
    case CODEC_ID_LJPEG:  put_marker(&s->pb, SOF3 ); break;
220
    default: assert(0);
221
    }
222

    
223
    put_bits(&s->pb, 16, 17);
224
    if(lossless && s->avctx->pix_fmt == PIX_FMT_RGB32)
225
        put_bits(&s->pb, 8, 9); /* 9 bits/component RCT */
226
    else
227
        put_bits(&s->pb, 8, 8); /* 8 bits/component */
228
    put_bits(&s->pb, 16, s->height);
229
    put_bits(&s->pb, 16, s->width);
230
    put_bits(&s->pb, 8, 3); /* 3 components */
231

    
232
    /* Y component */
233
    put_bits(&s->pb, 8, 1); /* component number */
234
    put_bits(&s->pb, 4, s->mjpeg_hsample[0]); /* H factor */
235
    put_bits(&s->pb, 4, s->mjpeg_vsample[0]); /* V factor */
236
    put_bits(&s->pb, 8, 0); /* select matrix */
237

    
238
    /* Cb component */
239
    put_bits(&s->pb, 8, 2); /* component number */
240
    put_bits(&s->pb, 4, s->mjpeg_hsample[1]); /* H factor */
241
    put_bits(&s->pb, 4, s->mjpeg_vsample[1]); /* V factor */
242
#ifdef TWOMATRIXES
243
    put_bits(&s->pb, 8, lossless ? 0 : 1); /* select matrix */
244
#else
245
    put_bits(&s->pb, 8, 0); /* select matrix */
246
#endif
247

    
248
    /* Cr component */
249
    put_bits(&s->pb, 8, 3); /* component number */
250
    put_bits(&s->pb, 4, s->mjpeg_hsample[2]); /* H factor */
251
    put_bits(&s->pb, 4, s->mjpeg_vsample[2]); /* V factor */
252
#ifdef TWOMATRIXES
253
    put_bits(&s->pb, 8, lossless ? 0 : 1); /* select matrix */
254
#else
255
    put_bits(&s->pb, 8, 0); /* select matrix */
256
#endif
257

    
258
    /* scan header */
259
    put_marker(&s->pb, SOS);
260
    put_bits(&s->pb, 16, 12); /* length */
261
    put_bits(&s->pb, 8, 3); /* 3 components */
262

    
263
    /* Y component */
264
    put_bits(&s->pb, 8, 1); /* index */
265
    put_bits(&s->pb, 4, 0); /* DC huffman table index */
266
    put_bits(&s->pb, 4, 0); /* AC huffman table index */
267

    
268
    /* Cb component */
269
    put_bits(&s->pb, 8, 2); /* index */
270
    put_bits(&s->pb, 4, 1); /* DC huffman table index */
271
    put_bits(&s->pb, 4, lossless ? 0 : 1); /* AC huffman table index */
272

    
273
    /* Cr component */
274
    put_bits(&s->pb, 8, 3); /* index */
275
    put_bits(&s->pb, 4, 1); /* DC huffman table index */
276
    put_bits(&s->pb, 4, lossless ? 0 : 1); /* AC huffman table index */
277

    
278
    put_bits(&s->pb, 8, lossless ? s->avctx->prediction_method+1 : 0); /* Ss (not used) */
279

    
280
    switch(s->avctx->codec_id){
281
    case CODEC_ID_MJPEG:  put_bits(&s->pb, 8, 63); break; /* Se (not used) */
282
    case CODEC_ID_LJPEG:  put_bits(&s->pb, 8,  0); break; /* not used */
283
    default: assert(0);
284
    }
285

    
286
    put_bits(&s->pb, 8, 0); /* Ah/Al (not used) */
287
}
288

    
289
static void escape_FF(MpegEncContext *s, int start)
290
{
291
    int size= put_bits_count(&s->pb) - start*8;
292
    int i, ff_count;
293
    uint8_t *buf= s->pb.buf + start;
294
    int align= (-(size_t)(buf))&3;
295

    
296
    assert((size&7) == 0);
297
    size >>= 3;
298

    
299
    ff_count=0;
300
    for(i=0; i<size && i<align; i++){
301
        if(buf[i]==0xFF) ff_count++;
302
    }
303
    for(; i<size-15; i+=16){
304
        int acc, v;
305

    
306
        v= *(uint32_t*)(&buf[i]);
307
        acc= (((v & (v>>4))&0x0F0F0F0F)+0x01010101)&0x10101010;
308
        v= *(uint32_t*)(&buf[i+4]);
309
        acc+=(((v & (v>>4))&0x0F0F0F0F)+0x01010101)&0x10101010;
310
        v= *(uint32_t*)(&buf[i+8]);
311
        acc+=(((v & (v>>4))&0x0F0F0F0F)+0x01010101)&0x10101010;
312
        v= *(uint32_t*)(&buf[i+12]);
313
        acc+=(((v & (v>>4))&0x0F0F0F0F)+0x01010101)&0x10101010;
314

    
315
        acc>>=4;
316
        acc+= (acc>>16);
317
        acc+= (acc>>8);
318
        ff_count+= acc&0xFF;
319
    }
320
    for(; i<size; i++){
321
        if(buf[i]==0xFF) ff_count++;
322
    }
323

    
324
    if(ff_count==0) return;
325

    
326
    /* skip put bits */
327
    for(i=0; i<ff_count-3; i+=4)
328
        put_bits(&s->pb, 32, 0);
329
    put_bits(&s->pb, (ff_count-i)*8, 0);
330
    flush_put_bits(&s->pb);
331

    
332
    for(i=size-1; ff_count; i--){
333
        int v= buf[i];
334

    
335
        if(v==0xFF){
336
//printf("%d %d\n", i, ff_count);
337
            buf[i+ff_count]= 0;
338
            ff_count--;
339
        }
340

    
341
        buf[i+ff_count]= v;
342
    }
343
}
344

    
345
void ff_mjpeg_stuffing(PutBitContext * pbc)
346
{
347
    int length;
348
    length= (-put_bits_count(pbc))&7;
349
    if(length) put_bits(pbc, length, (1<<length)-1);
350
}
351

    
352
void mjpeg_picture_trailer(MpegEncContext *s)
353
{
354
    ff_mjpeg_stuffing(&s->pb);
355
    flush_put_bits(&s->pb);
356

    
357
    assert((s->header_bits&7)==0);
358

    
359
    escape_FF(s, s->header_bits>>3);
360

    
361
    put_marker(&s->pb, EOI);
362
}
363

    
364
static inline void mjpeg_encode_dc(MpegEncContext *s, int val,
365
                                   uint8_t *huff_size, uint16_t *huff_code)
366
{
367
    int mant, nbits;
368

    
369
    if (val == 0) {
370
        put_bits(&s->pb, huff_size[0], huff_code[0]);
371
    } else {
372
        mant = val;
373
        if (val < 0) {
374
            val = -val;
375
            mant--;
376
        }
377

    
378
        nbits= av_log2_16bit(val) + 1;
379

    
380
        put_bits(&s->pb, huff_size[nbits], huff_code[nbits]);
381

    
382
        put_bits(&s->pb, nbits, mant & ((1 << nbits) - 1));
383
    }
384
}
385

    
386
static void encode_block(MpegEncContext *s, DCTELEM *block, int n)
387
{
388
    int mant, nbits, code, i, j;
389
    int component, dc, run, last_index, val;
390
    MJpegContext *m = s->mjpeg_ctx;
391
    uint8_t *huff_size_ac;
392
    uint16_t *huff_code_ac;
393

    
394
    /* DC coef */
395
    component = (n <= 3 ? 0 : (n&1) + 1);
396
    dc = block[0]; /* overflow is impossible */
397
    val = dc - s->last_dc[component];
398
    if (n < 4) {
399
        mjpeg_encode_dc(s, val, m->huff_size_dc_luminance, m->huff_code_dc_luminance);
400
        huff_size_ac = m->huff_size_ac_luminance;
401
        huff_code_ac = m->huff_code_ac_luminance;
402
    } else {
403
        mjpeg_encode_dc(s, val, m->huff_size_dc_chrominance, m->huff_code_dc_chrominance);
404
        huff_size_ac = m->huff_size_ac_chrominance;
405
        huff_code_ac = m->huff_code_ac_chrominance;
406
    }
407
    s->last_dc[component] = dc;
408

    
409
    /* AC coefs */
410

    
411
    run = 0;
412
    last_index = s->block_last_index[n];
413
    for(i=1;i<=last_index;i++) {
414
        j = s->intra_scantable.permutated[i];
415
        val = block[j];
416
        if (val == 0) {
417
            run++;
418
        } else {
419
            while (run >= 16) {
420
                put_bits(&s->pb, huff_size_ac[0xf0], huff_code_ac[0xf0]);
421
                run -= 16;
422
            }
423
            mant = val;
424
            if (val < 0) {
425
                val = -val;
426
                mant--;
427
            }
428

    
429
            nbits= av_log2(val) + 1;
430
            code = (run << 4) | nbits;
431

    
432
            put_bits(&s->pb, huff_size_ac[code], huff_code_ac[code]);
433

    
434
            put_bits(&s->pb, nbits, mant & ((1 << nbits) - 1));
435
            run = 0;
436
        }
437
    }
438

    
439
    /* output EOB only if not already 64 values */
440
    if (last_index < 63 || run != 0)
441
        put_bits(&s->pb, huff_size_ac[0], huff_code_ac[0]);
442
}
443

    
444
void mjpeg_encode_mb(MpegEncContext *s,
445
                     DCTELEM block[6][64])
446
{
447
    int i;
448
    for(i=0;i<5;i++) {
449
        encode_block(s, block[i], i);
450
    }
451
    if (s->chroma_format == CHROMA_420) {
452
        encode_block(s, block[5], 5);
453
    } else {
454
        encode_block(s, block[6], 6);
455
        encode_block(s, block[5], 5);
456
        encode_block(s, block[7], 7);
457
    }
458
}
459

    
460
static int encode_picture_lossless(AVCodecContext *avctx, unsigned char *buf, int buf_size, void *data){
461
    MpegEncContext * const s = avctx->priv_data;
462
    MJpegContext * const m = s->mjpeg_ctx;
463
    AVFrame *pict = data;
464
    const int width= s->width;
465
    const int height= s->height;
466
    AVFrame * const p= (AVFrame*)&s->current_picture;
467
    const int predictor= avctx->prediction_method+1;
468

    
469
    init_put_bits(&s->pb, buf, buf_size);
470

    
471
    *p = *pict;
472
    p->pict_type= FF_I_TYPE;
473
    p->key_frame= 1;
474

    
475
    mjpeg_picture_header(s);
476

    
477
    s->header_bits= put_bits_count(&s->pb);
478

    
479
    if(avctx->pix_fmt == PIX_FMT_RGB32){
480
        int x, y, i;
481
        const int linesize= p->linesize[0];
482
        uint16_t (*buffer)[4]= (void *) s->rd_scratchpad;
483
        int left[3], top[3], topleft[3];
484

    
485
        for(i=0; i<3; i++){
486
            buffer[0][i]= 1 << (9 - 1);
487
        }
488

    
489
        for(y = 0; y < height; y++) {
490
            const int modified_predictor= y ? predictor : 1;
491
            uint8_t *ptr = p->data[0] + (linesize * y);
492

    
493
            if(s->pb.buf_end - s->pb.buf - (put_bits_count(&s->pb)>>3) < width*3*4){
494
                av_log(s->avctx, AV_LOG_ERROR, "encoded frame too large\n");
495
                return -1;
496
            }
497

    
498
            for(i=0; i<3; i++){
499
                top[i]= left[i]= topleft[i]= buffer[0][i];
500
            }
501
            for(x = 0; x < width; x++) {
502
                buffer[x][1] = ptr[4*x+0] - ptr[4*x+1] + 0x100;
503
                buffer[x][2] = ptr[4*x+2] - ptr[4*x+1] + 0x100;
504
                buffer[x][0] = (ptr[4*x+0] + 2*ptr[4*x+1] + ptr[4*x+2])>>2;
505

    
506
                for(i=0;i<3;i++) {
507
                    int pred, diff;
508

    
509
                    PREDICT(pred, topleft[i], top[i], left[i], modified_predictor);
510

    
511
                    topleft[i]= top[i];
512
                    top[i]= buffer[x+1][i];
513

    
514
                    left[i]= buffer[x][i];
515

    
516
                    diff= ((left[i] - pred + 0x100)&0x1FF) - 0x100;
517

    
518
                    if(i==0)
519
                        mjpeg_encode_dc(s, diff, m->huff_size_dc_luminance, m->huff_code_dc_luminance); //FIXME ugly
520
                    else
521
                        mjpeg_encode_dc(s, diff, m->huff_size_dc_chrominance, m->huff_code_dc_chrominance);
522
                }
523
            }
524
        }
525
    }else{
526
        int mb_x, mb_y, i;
527
        const int mb_width  = (width  + s->mjpeg_hsample[0] - 1) / s->mjpeg_hsample[0];
528
        const int mb_height = (height + s->mjpeg_vsample[0] - 1) / s->mjpeg_vsample[0];
529

    
530
        for(mb_y = 0; mb_y < mb_height; mb_y++) {
531
            if(s->pb.buf_end - s->pb.buf - (put_bits_count(&s->pb)>>3) < mb_width * 4 * 3 * s->mjpeg_hsample[0] * s->mjpeg_vsample[0]){
532
                av_log(s->avctx, AV_LOG_ERROR, "encoded frame too large\n");
533
                return -1;
534
            }
535
            for(mb_x = 0; mb_x < mb_width; mb_x++) {
536
                if(mb_x==0 || mb_y==0){
537
                    for(i=0;i<3;i++) {
538
                        uint8_t *ptr;
539
                        int x, y, h, v, linesize;
540
                        h = s->mjpeg_hsample[i];
541
                        v = s->mjpeg_vsample[i];
542
                        linesize= p->linesize[i];
543

    
544
                        for(y=0; y<v; y++){
545
                            for(x=0; x<h; x++){
546
                                int pred;
547

    
548
                                ptr = p->data[i] + (linesize * (v * mb_y + y)) + (h * mb_x + x); //FIXME optimize this crap
549
                                if(y==0 && mb_y==0){
550
                                    if(x==0 && mb_x==0){
551
                                        pred= 128;
552
                                    }else{
553
                                        pred= ptr[-1];
554
                                    }
555
                                }else{
556
                                    if(x==0 && mb_x==0){
557
                                        pred= ptr[-linesize];
558
                                    }else{
559
                                        PREDICT(pred, ptr[-linesize-1], ptr[-linesize], ptr[-1], predictor);
560
                                    }
561
                                }
562

    
563
                                if(i==0)
564
                                    mjpeg_encode_dc(s, (int8_t)(*ptr - pred), m->huff_size_dc_luminance, m->huff_code_dc_luminance); //FIXME ugly
565
                                else
566
                                    mjpeg_encode_dc(s, (int8_t)(*ptr - pred), m->huff_size_dc_chrominance, m->huff_code_dc_chrominance);
567
                            }
568
                        }
569
                    }
570
                }else{
571
                    for(i=0;i<3;i++) {
572
                        uint8_t *ptr;
573
                        int x, y, h, v, linesize;
574
                        h = s->mjpeg_hsample[i];
575
                        v = s->mjpeg_vsample[i];
576
                        linesize= p->linesize[i];
577

    
578
                        for(y=0; y<v; y++){
579
                            for(x=0; x<h; x++){
580
                                int pred;
581

    
582
                                ptr = p->data[i] + (linesize * (v * mb_y + y)) + (h * mb_x + x); //FIXME optimize this crap
583
//printf("%d %d %d %d %8X\n", mb_x, mb_y, x, y, ptr);
584
                                PREDICT(pred, ptr[-linesize-1], ptr[-linesize], ptr[-1], predictor);
585

    
586
                                if(i==0)
587
                                    mjpeg_encode_dc(s, (int8_t)(*ptr - pred), m->huff_size_dc_luminance, m->huff_code_dc_luminance); //FIXME ugly
588
                                else
589
                                    mjpeg_encode_dc(s, (int8_t)(*ptr - pred), m->huff_size_dc_chrominance, m->huff_code_dc_chrominance);
590
                            }
591
                        }
592
                    }
593
                }
594
            }
595
        }
596
    }
597

    
598
    emms_c();
599

    
600
    mjpeg_picture_trailer(s);
601
    s->picture_number++;
602

    
603
    flush_put_bits(&s->pb);
604
    return pbBufPtr(&s->pb) - s->pb.buf;
605
//    return (put_bits_count(&f->pb)+7)/8;
606
}
607

    
608

    
609
AVCodec ljpeg_encoder = { //FIXME avoid MPV_* lossless jpeg shouldnt need them
610
    "ljpeg",
611
    CODEC_TYPE_VIDEO,
612
    CODEC_ID_LJPEG,
613
    sizeof(MpegEncContext),
614
    MPV_encode_init,
615
    encode_picture_lossless,
616
    MPV_encode_end,
617
};