Statistics
| Branch: | Revision:

ffmpeg / libavcodec / mjpegdec.c @ 4922a5b0

History | View | Annotate | Download (54.4 KB)

1
/*
2
 * MJPEG decoder
3
 * Copyright (c) 2000, 2001 Fabrice Bellard.
4
 * Copyright (c) 2003 Alex Beregszaszi
5
 * Copyright (c) 2003-2004 Michael Niedermayer
6
 *
7
 * This file is part of FFmpeg.
8
 *
9
 * FFmpeg is free software; you can redistribute it and/or
10
 * modify it under the terms of the GNU Lesser General Public
11
 * License as published by the Free Software Foundation; either
12
 * version 2.1 of the License, or (at your option) any later version.
13
 *
14
 * FFmpeg is distributed in the hope that it will be useful,
15
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
17
 * Lesser General Public License for more details.
18
 *
19
 * You should have received a copy of the GNU Lesser General Public
20
 * License along with FFmpeg; if not, write to the Free Software
21
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
22
 *
23
 * Support for external huffman table, various fixes (AVID workaround),
24
 * aspecting, new decode_frame mechanism and apple mjpeg-b support
25
 *                                  by Alex Beregszaszi
26
 */
27

    
28
/**
29
 * @file mjpegdec.c
30
 * MJPEG decoder.
31
 */
32

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

    
36
#include "avcodec.h"
37
#include "dsputil.h"
38
#include "bytestream.h"
39
#include "mjpeg.h"
40
#include "jpeglsdec.h"
41

    
42

    
43
static int mjpeg_decode_dht(MJpegDecodeContext *s);
44

    
45
static int build_vlc(VLC *vlc, const uint8_t *bits_table, const uint8_t *val_table,
46
                      int nb_codes, int use_static, int is_ac)
47
{
48
    uint8_t huff_size[256+16];
49
    uint16_t huff_code[256+16];
50

    
51
    assert(nb_codes <= 256);
52

    
53
    memset(huff_size, 0, sizeof(huff_size));
54
    build_huffman_codes(huff_size, huff_code, bits_table, val_table);
55

    
56
    if(is_ac){
57
        memmove(huff_size+16, huff_size, sizeof(uint8_t)*nb_codes);
58
        memmove(huff_code+16, huff_code, sizeof(uint16_t)*nb_codes);
59
        memset(huff_size, 0, sizeof(uint8_t)*16);
60
        memset(huff_code, 0, sizeof(uint16_t)*16);
61
        nb_codes += 16;
62
    }
63

    
64
    return init_vlc(vlc, 9, nb_codes, huff_size, 1, 1, huff_code, 2, 2, use_static);
65
}
66

    
67
static int mjpeg_decode_init(AVCodecContext *avctx)
68
{
69
    MJpegDecodeContext *s = avctx->priv_data;
70

    
71
    s->avctx = avctx;
72
    dsputil_init(&s->dsp, avctx);
73
    ff_init_scantable(s->dsp.idct_permutation, &s->scantable, ff_zigzag_direct);
74
    s->buffer_size = 0;
75
    s->buffer = NULL;
76
    s->start_code = -1;
77
    s->first_picture = 1;
78
    s->org_height = avctx->coded_height;
79

    
80
    build_vlc(&s->vlcs[0][0], bits_dc_luminance, val_dc_luminance, 12, 0, 0);
81
    build_vlc(&s->vlcs[0][1], bits_dc_chrominance, val_dc_chrominance, 12, 0, 0);
82
    build_vlc(&s->vlcs[1][0], bits_ac_luminance, val_ac_luminance, 251, 0, 1);
83
    build_vlc(&s->vlcs[1][1], bits_ac_chrominance, val_ac_chrominance, 251, 0, 1);
84

    
85
    if (avctx->flags & CODEC_FLAG_EXTERN_HUFF)
86
    {
87
        av_log(avctx, AV_LOG_INFO, "mjpeg: using external huffman table\n");
88
        init_get_bits(&s->gb, avctx->extradata, avctx->extradata_size*8);
89
        mjpeg_decode_dht(s);
90
        /* should check for error - but dunno */
91
    }
92
    if (avctx->extradata_size > 9 &&
93
        AV_RL32(avctx->extradata + 4) == MKTAG('f','i','e','l')) {
94
        if (avctx->extradata[9] == 6) { /* quicktime icefloe 019 */
95
            s->interlace_polarity = 1; /* bottom field first */
96
            av_log(avctx, AV_LOG_DEBUG, "mjpeg bottom field first\n");
97
        }
98
    }
99

    
100
    return 0;
101
}
102

    
103

    
104
/* quantize tables */
105
static int mjpeg_decode_dqt(MJpegDecodeContext *s)
106
{
107
    int len, index, i, j;
108

    
109
    len = get_bits(&s->gb, 16) - 2;
110

    
111
    while (len >= 65) {
112
        /* only 8 bit precision handled */
113
        if (get_bits(&s->gb, 4) != 0)
114
        {
115
            av_log(s->avctx, AV_LOG_ERROR, "dqt: 16bit precision\n");
116
            return -1;
117
        }
118
        index = get_bits(&s->gb, 4);
119
        if (index >= 4)
120
            return -1;
121
        av_log(s->avctx, AV_LOG_DEBUG, "index=%d\n", index);
122
        /* read quant table */
123
        for(i=0;i<64;i++) {
124
            j = s->scantable.permutated[i];
125
            s->quant_matrixes[index][j] = get_bits(&s->gb, 8);
126
        }
127

    
128
        //XXX FIXME finetune, and perhaps add dc too
129
        s->qscale[index]= FFMAX(
130
            s->quant_matrixes[index][s->scantable.permutated[1]],
131
            s->quant_matrixes[index][s->scantable.permutated[8]]) >> 1;
132
        av_log(s->avctx, AV_LOG_DEBUG, "qscale[%d]: %d\n", index, s->qscale[index]);
133
        len -= 65;
134
    }
135

    
136
    return 0;
137
}
138

    
139
/* decode huffman tables and build VLC decoders */
140
static int mjpeg_decode_dht(MJpegDecodeContext *s)
141
{
142
    int len, index, i, class, n, v, code_max;
143
    uint8_t bits_table[17];
144
    uint8_t val_table[256];
145

    
146
    len = get_bits(&s->gb, 16) - 2;
147

    
148
    while (len > 0) {
149
        if (len < 17)
150
            return -1;
151
        class = get_bits(&s->gb, 4);
152
        if (class >= 2)
153
            return -1;
154
        index = get_bits(&s->gb, 4);
155
        if (index >= 4)
156
            return -1;
157
        n = 0;
158
        for(i=1;i<=16;i++) {
159
            bits_table[i] = get_bits(&s->gb, 8);
160
            n += bits_table[i];
161
        }
162
        len -= 17;
163
        if (len < n || n > 256)
164
            return -1;
165

    
166
        code_max = 0;
167
        for(i=0;i<n;i++) {
168
            v = get_bits(&s->gb, 8);
169
            if (v > code_max)
170
                code_max = v;
171
            val_table[i] = v;
172
        }
173
        len -= n;
174

    
175
        /* build VLC and flush previous vlc if present */
176
        free_vlc(&s->vlcs[class][index]);
177
        av_log(s->avctx, AV_LOG_DEBUG, "class=%d index=%d nb_codes=%d\n",
178
               class, index, code_max + 1);
179
        if(build_vlc(&s->vlcs[class][index], bits_table, val_table, code_max + 1, 0, class > 0) < 0){
180
            return -1;
181
        }
182
    }
183
    return 0;
184
}
185

    
186
static int mjpeg_decode_sof(MJpegDecodeContext *s)
187
{
188
    int len, nb_components, i, width, height, pix_fmt_id;
189

    
190
    /* XXX: verify len field validity */
191
    len = get_bits(&s->gb, 16);
192
    s->bits= get_bits(&s->gb, 8);
193

    
194
    if(s->pegasus_rct) s->bits=9;
195
    if(s->bits==9 && !s->pegasus_rct) s->rct=1;    //FIXME ugly
196

    
197
    if (s->bits != 8 && !s->lossless){
198
        av_log(s->avctx, AV_LOG_ERROR, "only 8 bits/component accepted\n");
199
        return -1;
200
    }
201

    
202
    height = get_bits(&s->gb, 16);
203
    width = get_bits(&s->gb, 16);
204

    
205
    //HACK for odd_height.mov
206
    if(s->interlaced && s->width == width && s->height == height + 1)
207
        height= s->height;
208

    
209
    av_log(s->avctx, AV_LOG_DEBUG, "sof0: picture: %dx%d\n", width, height);
210
    if(avcodec_check_dimensions(s->avctx, width, height))
211
        return -1;
212

    
213
    nb_components = get_bits(&s->gb, 8);
214
    if (nb_components <= 0 ||
215
        nb_components > MAX_COMPONENTS)
216
        return -1;
217
    if (s->ls && !(s->bits <= 8 || nb_components == 1)){
218
        av_log(s->avctx, AV_LOG_ERROR, "only <= 8 bits/component or 16-bit gray accepted for JPEG-LS\n");
219
        return -1;
220
    }
221
    s->nb_components = nb_components;
222
    s->h_max = 1;
223
    s->v_max = 1;
224
    for(i=0;i<nb_components;i++) {
225
        /* component id */
226
        s->component_id[i] = get_bits(&s->gb, 8) - 1;
227
        s->h_count[i] = get_bits(&s->gb, 4);
228
        s->v_count[i] = get_bits(&s->gb, 4);
229
        /* compute hmax and vmax (only used in interleaved case) */
230
        if (s->h_count[i] > s->h_max)
231
            s->h_max = s->h_count[i];
232
        if (s->v_count[i] > s->v_max)
233
            s->v_max = s->v_count[i];
234
        s->quant_index[i] = get_bits(&s->gb, 8);
235
        if (s->quant_index[i] >= 4)
236
            return -1;
237
        av_log(s->avctx, AV_LOG_DEBUG, "component %d %d:%d id: %d quant:%d\n", i, s->h_count[i],
238
               s->v_count[i], s->component_id[i], s->quant_index[i]);
239
    }
240

    
241
    if(s->ls && (s->h_max > 1 || s->v_max > 1)) {
242
        av_log(s->avctx, AV_LOG_ERROR, "Subsampling in JPEG-LS is not supported.\n");
243
        return -1;
244
    }
245

    
246
    if(s->v_max==1 && s->h_max==1 && s->lossless==1) s->rgb=1;
247

    
248
    /* if different size, realloc/alloc picture */
249
    /* XXX: also check h_count and v_count */
250
    if (width != s->width || height != s->height) {
251
        av_freep(&s->qscale_table);
252

    
253
        s->width = width;
254
        s->height = height;
255
        s->interlaced = 0;
256

    
257
        /* test interlaced mode */
258
        if (s->first_picture &&
259
            s->org_height != 0 &&
260
            s->height < ((s->org_height * 3) / 4)) {
261
            s->interlaced = 1;
262
            s->bottom_field = s->interlace_polarity;
263
            s->picture.interlaced_frame = 1;
264
            s->picture.top_field_first = !s->interlace_polarity;
265
            height *= 2;
266
        }
267

    
268
        avcodec_set_dimensions(s->avctx, width, height);
269

    
270
        s->qscale_table= av_mallocz((s->width+15)/16);
271

    
272
        s->first_picture = 0;
273
    }
274

    
275
    if(s->interlaced && (s->bottom_field == !s->interlace_polarity))
276
        return 0;
277

    
278
    /* XXX: not complete test ! */
279
    pix_fmt_id = (s->h_count[0] << 20) | (s->v_count[0] << 16) |
280
                 (s->h_count[1] << 12) | (s->v_count[1] <<  8) |
281
                 (s->h_count[2] <<  4) |  s->v_count[2];
282
    av_log(s->avctx, AV_LOG_DEBUG, "pix fmt id %x\n", pix_fmt_id);
283
    switch(pix_fmt_id){
284
    case 0x222222:
285
    case 0x111111:
286
        if(s->rgb){
287
            s->avctx->pix_fmt = PIX_FMT_RGB32;
288
        }else if(s->nb_components==3)
289
            s->avctx->pix_fmt = s->cs_itu601 ? PIX_FMT_YUV444P : PIX_FMT_YUVJ444P;
290
        else
291
            s->avctx->pix_fmt = PIX_FMT_GRAY8;
292
        break;
293
    case 0x211111:
294
    case 0x221212:
295
        s->avctx->pix_fmt = s->cs_itu601 ? PIX_FMT_YUV422P : PIX_FMT_YUVJ422P;
296
        break;
297
    default:
298
    case 0x221111:
299
        s->avctx->pix_fmt = s->cs_itu601 ? PIX_FMT_YUV420P : PIX_FMT_YUVJ420P;
300
        break;
301
    }
302
    if(s->ls){
303
        if(s->nb_components > 1)
304
            s->avctx->pix_fmt = PIX_FMT_RGB24;
305
        else if(s->bits <= 8)
306
            s->avctx->pix_fmt = PIX_FMT_GRAY8;
307
        else
308
            s->avctx->pix_fmt = PIX_FMT_GRAY16;
309
    }
310

    
311
    if(s->picture.data[0])
312
        s->avctx->release_buffer(s->avctx, &s->picture);
313

    
314
    s->picture.reference= 0;
315
    if(s->avctx->get_buffer(s->avctx, &s->picture) < 0){
316
        av_log(s->avctx, AV_LOG_ERROR, "get_buffer() failed\n");
317
        return -1;
318
    }
319
    s->picture.pict_type= I_TYPE;
320
    s->picture.key_frame= 1;
321

    
322
    for(i=0; i<3; i++){
323
        s->linesize[i]= s->picture.linesize[i] << s->interlaced;
324
    }
325

    
326
//    printf("%d %d %d %d %d %d\n", s->width, s->height, s->linesize[0], s->linesize[1], s->interlaced, s->avctx->height);
327

    
328
    if (len != (8+(3*nb_components)))
329
    {
330
        av_log(s->avctx, AV_LOG_DEBUG, "decode_sof0: error, len(%d) mismatch\n", len);
331
    }
332

    
333
    /* totally blank picture as progressive JPEG will only add details to it */
334
    if(s->progressive){
335
        memset(s->picture.data[0], 0, s->picture.linesize[0] * s->height);
336
        memset(s->picture.data[1], 0, s->picture.linesize[1] * s->height >> (s->v_max - s->v_count[1]));
337
        memset(s->picture.data[2], 0, s->picture.linesize[2] * s->height >> (s->v_max - s->v_count[2]));
338
    }
339
    return 0;
340
}
341

    
342
static inline int mjpeg_decode_dc(MJpegDecodeContext *s, int dc_index)
343
{
344
    int code;
345
    code = get_vlc2(&s->gb, s->vlcs[0][dc_index].table, 9, 2);
346
    if (code < 0)
347
    {
348
        av_log(s->avctx, AV_LOG_WARNING, "mjpeg_decode_dc: bad vlc: %d:%d (%p)\n", 0, dc_index,
349
               &s->vlcs[0][dc_index]);
350
        return 0xffff;
351
    }
352

    
353
    if(code)
354
        return get_xbits(&s->gb, code);
355
    else
356
        return 0;
357
}
358

    
359
/* decode block and dequantize */
360
static int decode_block(MJpegDecodeContext *s, DCTELEM *block,
361
                        int component, int dc_index, int ac_index, int16_t *quant_matrix)
362
{
363
    int code, i, j, level, val;
364

    
365
    /* DC coef */
366
    val = mjpeg_decode_dc(s, dc_index);
367
    if (val == 0xffff) {
368
        av_log(s->avctx, AV_LOG_ERROR, "error dc\n");
369
        return -1;
370
    }
371
    val = val * quant_matrix[0] + s->last_dc[component];
372
    s->last_dc[component] = val;
373
    block[0] = val;
374
    /* AC coefs */
375
    i = 0;
376
    {OPEN_READER(re, &s->gb)
377
    for(;;) {
378
        UPDATE_CACHE(re, &s->gb);
379
        GET_VLC(code, re, &s->gb, s->vlcs[1][ac_index].table, 9, 2)
380

    
381
        /* EOB */
382
        if (code == 0x10)
383
            break;
384
        i += ((unsigned)code) >> 4;
385
        if(code != 0x100){
386
            code &= 0xf;
387
            if(code > MIN_CACHE_BITS - 16){
388
                UPDATE_CACHE(re, &s->gb)
389
            }
390
            {
391
                int cache=GET_CACHE(re,&s->gb);
392
                int sign=(~cache)>>31;
393
                level = (NEG_USR32(sign ^ cache,code) ^ sign) - sign;
394
            }
395

    
396
            LAST_SKIP_BITS(re, &s->gb, code)
397

    
398
            if (i >= 63) {
399
                if(i == 63){
400
                    j = s->scantable.permutated[63];
401
                    block[j] = level * quant_matrix[j];
402
                    break;
403
                }
404
                av_log(s->avctx, AV_LOG_ERROR, "error count: %d\n", i);
405
                return -1;
406
            }
407
            j = s->scantable.permutated[i];
408
            block[j] = level * quant_matrix[j];
409
        }
410
    }
411
    CLOSE_READER(re, &s->gb)}
412

    
413
    return 0;
414
}
415

    
416
/* decode block and dequantize - progressive JPEG version */
417
static int decode_block_progressive(MJpegDecodeContext *s, DCTELEM *block,
418
                        int component, int dc_index, int ac_index, int16_t *quant_matrix,
419
                        int ss, int se, int Ah, int Al, int *EOBRUN)
420
{
421
    int code, i, j, level, val, run;
422

    
423
    /* DC coef */
424
    if(!ss){
425
        val = mjpeg_decode_dc(s, dc_index);
426
        if (val == 0xffff) {
427
            av_log(s->avctx, AV_LOG_ERROR, "error dc\n");
428
            return -1;
429
        }
430
        val = (val * quant_matrix[0] << Al) + s->last_dc[component];
431
    }else
432
        val = 0;
433
    s->last_dc[component] = val;
434
    block[0] = val;
435
    if(!se) return 0;
436
    /* AC coefs */
437
    if(*EOBRUN){
438
        (*EOBRUN)--;
439
        return 0;
440
    }
441
    {OPEN_READER(re, &s->gb)
442
    for(i=ss;;i++) {
443
        UPDATE_CACHE(re, &s->gb);
444
        GET_VLC(code, re, &s->gb, s->vlcs[1][ac_index].table, 9, 2)
445
        /* Progressive JPEG use AC coeffs from zero and this decoder sets offset 16 by default */
446
        code -= 16;
447
        if(code & 0xF) {
448
            i += ((unsigned) code) >> 4;
449
            code &= 0xf;
450
            if(code > MIN_CACHE_BITS - 16){
451
                UPDATE_CACHE(re, &s->gb)
452
            }
453
            {
454
                int cache=GET_CACHE(re,&s->gb);
455
                int sign=(~cache)>>31;
456
                level = (NEG_USR32(sign ^ cache,code) ^ sign) - sign;
457
            }
458

    
459
            LAST_SKIP_BITS(re, &s->gb, code)
460

    
461
            if (i >= se) {
462
                if(i == se){
463
                    j = s->scantable.permutated[se];
464
                    block[j] = level * quant_matrix[j] << Al;
465
                    break;
466
                }
467
                av_log(s->avctx, AV_LOG_ERROR, "error count: %d\n", i);
468
                return -1;
469
            }
470
            j = s->scantable.permutated[i];
471
            block[j] = level * quant_matrix[j] << Al;
472
        }else{
473
            run = ((unsigned) code) >> 4;
474
            if(run == 0xF){// ZRL - skip 15 coefficients
475
                i += 15;
476
            }else{
477
                val = run;
478
                run = (1 << run);
479
                UPDATE_CACHE(re, &s->gb);
480
                run += (GET_CACHE(re, &s->gb) >> (32 - val)) & (run - 1);
481
                if(val)
482
                    LAST_SKIP_BITS(re, &s->gb, val);
483
                *EOBRUN = run - 1;
484
                break;
485
            }
486
        }
487
    }
488
    CLOSE_READER(re, &s->gb)}
489

    
490
    return 0;
491
}
492

    
493
static int ljpeg_decode_rgb_scan(MJpegDecodeContext *s, int predictor, int point_transform){
494
    int i, mb_x, mb_y;
495
    uint16_t buffer[32768][4];
496
    int left[3], top[3], topleft[3];
497
    const int linesize= s->linesize[0];
498
    const int mask= (1<<s->bits)-1;
499

    
500
    if((unsigned)s->mb_width > 32768) //dynamic alloc
501
        return -1;
502

    
503
    for(i=0; i<3; i++){
504
        buffer[0][i]= 1 << (s->bits + point_transform - 1);
505
    }
506
    for(mb_y = 0; mb_y < s->mb_height; mb_y++) {
507
        const int modified_predictor= mb_y ? predictor : 1;
508
        uint8_t *ptr = s->picture.data[0] + (linesize * mb_y);
509

    
510
        if (s->interlaced && s->bottom_field)
511
            ptr += linesize >> 1;
512

    
513
        for(i=0; i<3; i++){
514
            top[i]= left[i]= topleft[i]= buffer[0][i];
515
        }
516
        for(mb_x = 0; mb_x < s->mb_width; mb_x++) {
517
            if (s->restart_interval && !s->restart_count)
518
                s->restart_count = s->restart_interval;
519

    
520
            for(i=0;i<3;i++) {
521
                int pred;
522

    
523
                topleft[i]= top[i];
524
                top[i]= buffer[mb_x][i];
525

    
526
                PREDICT(pred, topleft[i], top[i], left[i], modified_predictor);
527

    
528
                left[i]=
529
                buffer[mb_x][i]= mask & (pred + (mjpeg_decode_dc(s, s->dc_index[i]) << point_transform));
530
            }
531

    
532
            if (s->restart_interval && !--s->restart_count) {
533
                align_get_bits(&s->gb);
534
                skip_bits(&s->gb, 16); /* skip RSTn */
535
            }
536
        }
537

    
538
        if(s->rct){
539
            for(mb_x = 0; mb_x < s->mb_width; mb_x++) {
540
                ptr[4*mb_x+1] = buffer[mb_x][0] - ((buffer[mb_x][1] + buffer[mb_x][2] - 0x200)>>2);
541
                ptr[4*mb_x+0] = buffer[mb_x][1] + ptr[4*mb_x+1];
542
                ptr[4*mb_x+2] = buffer[mb_x][2] + ptr[4*mb_x+1];
543
            }
544
        }else if(s->pegasus_rct){
545
            for(mb_x = 0; mb_x < s->mb_width; mb_x++) {
546
                ptr[4*mb_x+1] = buffer[mb_x][0] - ((buffer[mb_x][1] + buffer[mb_x][2])>>2);
547
                ptr[4*mb_x+0] = buffer[mb_x][1] + ptr[4*mb_x+1];
548
                ptr[4*mb_x+2] = buffer[mb_x][2] + ptr[4*mb_x+1];
549
            }
550
        }else{
551
            for(mb_x = 0; mb_x < s->mb_width; mb_x++) {
552
                ptr[4*mb_x+0] = buffer[mb_x][0];
553
                ptr[4*mb_x+1] = buffer[mb_x][1];
554
                ptr[4*mb_x+2] = buffer[mb_x][2];
555
            }
556
        }
557
    }
558
    return 0;
559
}
560

    
561
static int ljpeg_decode_yuv_scan(MJpegDecodeContext *s, int predictor, int point_transform){
562
    int i, mb_x, mb_y;
563
    const int nb_components=3;
564

    
565
    for(mb_y = 0; mb_y < s->mb_height; mb_y++) {
566
        for(mb_x = 0; mb_x < s->mb_width; mb_x++) {
567
            if (s->restart_interval && !s->restart_count)
568
                s->restart_count = s->restart_interval;
569

    
570
            if(mb_x==0 || mb_y==0 || s->interlaced){
571
                for(i=0;i<nb_components;i++) {
572
                    uint8_t *ptr;
573
                    int n, h, v, x, y, c, j, linesize;
574
                    n = s->nb_blocks[i];
575
                    c = s->comp_index[i];
576
                    h = s->h_scount[i];
577
                    v = s->v_scount[i];
578
                    x = 0;
579
                    y = 0;
580
                    linesize= s->linesize[c];
581

    
582
                    for(j=0; j<n; j++) {
583
                        int pred;
584

    
585
                        ptr = s->picture.data[c] + (linesize * (v * mb_y + y)) + (h * mb_x + x); //FIXME optimize this crap
586
                        if(y==0 && mb_y==0){
587
                            if(x==0 && mb_x==0){
588
                                pred= 128 << point_transform;
589
                            }else{
590
                                pred= ptr[-1];
591
                            }
592
                        }else{
593
                            if(x==0 && mb_x==0){
594
                                pred= ptr[-linesize];
595
                            }else{
596
                                PREDICT(pred, ptr[-linesize-1], ptr[-linesize], ptr[-1], predictor);
597
                            }
598
                        }
599

    
600
                        if (s->interlaced && s->bottom_field)
601
                            ptr += linesize >> 1;
602
                        *ptr= pred + (mjpeg_decode_dc(s, s->dc_index[i]) << point_transform);
603

    
604
                        if (++x == h) {
605
                            x = 0;
606
                            y++;
607
                        }
608
                    }
609
                }
610
            }else{
611
                for(i=0;i<nb_components;i++) {
612
                    uint8_t *ptr;
613
                    int n, h, v, x, y, c, j, linesize;
614
                    n = s->nb_blocks[i];
615
                    c = s->comp_index[i];
616
                    h = s->h_scount[i];
617
                    v = s->v_scount[i];
618
                    x = 0;
619
                    y = 0;
620
                    linesize= s->linesize[c];
621

    
622
                    for(j=0; j<n; j++) {
623
                        int pred;
624

    
625
                        ptr = s->picture.data[c] + (linesize * (v * mb_y + y)) + (h * mb_x + x); //FIXME optimize this crap
626
                        PREDICT(pred, ptr[-linesize-1], ptr[-linesize], ptr[-1], predictor);
627
                        *ptr= pred + (mjpeg_decode_dc(s, s->dc_index[i]) << point_transform);
628
                        if (++x == h) {
629
                            x = 0;
630
                            y++;
631
                        }
632
                    }
633
                }
634
            }
635
            if (s->restart_interval && !--s->restart_count) {
636
                align_get_bits(&s->gb);
637
                skip_bits(&s->gb, 16); /* skip RSTn */
638
            }
639
        }
640
    }
641
    return 0;
642
}
643

    
644
static int mjpeg_decode_scan(MJpegDecodeContext *s, int nb_components, int ss, int se, int Ah, int Al){
645
    int i, mb_x, mb_y;
646
    int EOBRUN = 0;
647

    
648
    if(Ah) return 0; /* TODO decode refinement planes too */
649
    for(mb_y = 0; mb_y < s->mb_height; mb_y++) {
650
        for(mb_x = 0; mb_x < s->mb_width; mb_x++) {
651
            if (s->restart_interval && !s->restart_count)
652
                s->restart_count = s->restart_interval;
653

    
654
            for(i=0;i<nb_components;i++) {
655
                uint8_t *ptr;
656
                int n, h, v, x, y, c, j;
657
                n = s->nb_blocks[i];
658
                c = s->comp_index[i];
659
                h = s->h_scount[i];
660
                v = s->v_scount[i];
661
                x = 0;
662
                y = 0;
663
                for(j=0;j<n;j++) {
664
                    memset(s->block, 0, sizeof(s->block));
665
                    if (!s->progressive && decode_block(s, s->block, i,
666
                                     s->dc_index[i], s->ac_index[i],
667
                                     s->quant_matrixes[ s->quant_index[c] ]) < 0) {
668
                        av_log(s->avctx, AV_LOG_ERROR, "error y=%d x=%d\n", mb_y, mb_x);
669
                        return -1;
670
                    }
671
                    if (s->progressive && decode_block_progressive(s, s->block, i,
672
                                     s->dc_index[i], s->ac_index[i],
673
                                     s->quant_matrixes[ s->quant_index[c] ], ss, se, Ah, Al, &EOBRUN) < 0) {
674
                        av_log(s->avctx, AV_LOG_ERROR, "error y=%d x=%d\n", mb_y, mb_x);
675
                        return -1;
676
                    }
677
//                    av_log(s->avctx, AV_LOG_DEBUG, "mb: %d %d processed\n", mb_y, mb_x);
678
                    ptr = s->picture.data[c] +
679
                        (((s->linesize[c] * (v * mb_y + y) * 8) +
680
                        (h * mb_x + x) * 8) >> s->avctx->lowres);
681
                    if (s->interlaced && s->bottom_field)
682
                        ptr += s->linesize[c] >> 1;
683
//av_log(NULL, AV_LOG_DEBUG, "%d %d %d %d %d %d %d %d \n", mb_x, mb_y, x, y, c, s->bottom_field, (v * mb_y + y) * 8, (h * mb_x + x) * 8);
684
                    if(!s->progressive)
685
                        s->dsp.idct_put(ptr, s->linesize[c], s->block);
686
                    else
687
                        s->dsp.idct_add(ptr, s->linesize[c], s->block);
688
                    if (++x == h) {
689
                        x = 0;
690
                        y++;
691
                    }
692
                }
693
            }
694
            /* (< 1350) buggy workaround for Spectralfan.mov, should be fixed */
695
            if (s->restart_interval && (s->restart_interval < 1350) &&
696
                !--s->restart_count) {
697
                align_get_bits(&s->gb);
698
                skip_bits(&s->gb, 16); /* skip RSTn */
699
                for (i=0; i<nb_components; i++) /* reset dc */
700
                    s->last_dc[i] = 1024;
701
            }
702
        }
703
    }
704
    return 0;
705
}
706

    
707
static int mjpeg_decode_sos(MJpegDecodeContext *s)
708
{
709
    int len, nb_components, i, h, v, predictor, point_transform;
710
    int vmax, hmax, index, id;
711
    const int block_size= s->lossless ? 1 : 8;
712
    int ilv, prev_shift;
713

    
714
    /* XXX: verify len field validity */
715
    len = get_bits(&s->gb, 16);
716
    nb_components = get_bits(&s->gb, 8);
717
    if (len != 6+2*nb_components)
718
    {
719
        av_log(s->avctx, AV_LOG_ERROR, "decode_sos: invalid len (%d)\n", len);
720
        return -1;
721
    }
722
    vmax = 0;
723
    hmax = 0;
724
    for(i=0;i<nb_components;i++) {
725
        id = get_bits(&s->gb, 8) - 1;
726
        av_log(s->avctx, AV_LOG_DEBUG, "component: %d\n", id);
727
        /* find component index */
728
        for(index=0;index<s->nb_components;index++)
729
            if (id == s->component_id[index])
730
                break;
731
        if (index == s->nb_components)
732
        {
733
            av_log(s->avctx, AV_LOG_ERROR, "decode_sos: index(%d) out of components\n", index);
734
            return -1;
735
        }
736

    
737
        s->comp_index[i] = index;
738

    
739
        s->nb_blocks[i] = s->h_count[index] * s->v_count[index];
740
        s->h_scount[i] = s->h_count[index];
741
        s->v_scount[i] = s->v_count[index];
742

    
743
        s->dc_index[i] = get_bits(&s->gb, 4);
744
        s->ac_index[i] = get_bits(&s->gb, 4);
745

    
746
        if (s->dc_index[i] <  0 || s->ac_index[i] < 0 ||
747
            s->dc_index[i] >= 4 || s->ac_index[i] >= 4)
748
            goto out_of_range;
749
#if 0 //buggy
750
        switch(s->start_code)
751
        {
752
            case SOF0:
753
                if (dc_index[i] > 1 || ac_index[i] > 1)
754
                    goto out_of_range;
755
                break;
756
            case SOF1:
757
            case SOF2:
758
                if (dc_index[i] > 3 || ac_index[i] > 3)
759
                    goto out_of_range;
760
                break;
761
            case SOF3:
762
                if (dc_index[i] > 3 || ac_index[i] != 0)
763
                    goto out_of_range;
764
                break;
765
        }
766
#endif
767
    }
768

    
769
    predictor= get_bits(&s->gb, 8); /* JPEG Ss / lossless JPEG predictor /JPEG-LS NEAR */
770
    ilv= get_bits(&s->gb, 8);    /* JPEG Se / JPEG-LS ILV */
771
    prev_shift = get_bits(&s->gb, 4); /* Ah */
772
    point_transform= get_bits(&s->gb, 4); /* Al */
773

    
774
    for(i=0;i<nb_components;i++)
775
        s->last_dc[i] = 1024;
776

    
777
    if (nb_components > 1) {
778
        /* interleaved stream */
779
        s->mb_width  = (s->width  + s->h_max * block_size - 1) / (s->h_max * block_size);
780
        s->mb_height = (s->height + s->v_max * block_size - 1) / (s->v_max * block_size);
781
    } else if(!s->ls) { /* skip this for JPEG-LS */
782
        h = s->h_max / s->h_scount[0];
783
        v = s->v_max / s->v_scount[0];
784
        s->mb_width  = (s->width  + h * block_size - 1) / (h * block_size);
785
        s->mb_height = (s->height + v * block_size - 1) / (v * block_size);
786
        s->nb_blocks[0] = 1;
787
        s->h_scount[0] = 1;
788
        s->v_scount[0] = 1;
789
    }
790

    
791
    if(s->avctx->debug & FF_DEBUG_PICT_INFO)
792
        av_log(s->avctx, AV_LOG_DEBUG, "%s %s p:%d >>:%d ilv:%d bits:%d %s\n", s->lossless ? "lossless" : "sequencial DCT", s->rgb ? "RGB" : "",
793
               predictor, point_transform, ilv, s->bits,
794
               s->pegasus_rct ? "PRCT" : (s->rct ? "RCT" : ""));
795

    
796

    
797
    /* mjpeg-b can have padding bytes between sos and image data, skip them */
798
    for (i = s->mjpb_skiptosod; i > 0; i--)
799
        skip_bits(&s->gb, 8);
800

    
801
    if(s->lossless){
802
        if(s->ls){
803
//            for(){
804
//            reset_ls_coding_parameters(s, 0);
805

    
806
            ff_jpegls_decode_picture(s, predictor, point_transform, ilv);
807
        }else{
808
            if(s->rgb){
809
                if(ljpeg_decode_rgb_scan(s, predictor, point_transform) < 0)
810
                    return -1;
811
            }else{
812
                if(ljpeg_decode_yuv_scan(s, predictor, point_transform) < 0)
813
                    return -1;
814
            }
815
        }
816
    }else{
817
        if(mjpeg_decode_scan(s, nb_components, predictor, ilv, prev_shift, point_transform) < 0)
818
            return -1;
819
    }
820
    emms_c();
821
    return 0;
822
 out_of_range:
823
    av_log(s->avctx, AV_LOG_ERROR, "decode_sos: ac/dc index out of range\n");
824
    return -1;
825
}
826

    
827
static int mjpeg_decode_dri(MJpegDecodeContext *s)
828
{
829
    if (get_bits(&s->gb, 16) != 4)
830
        return -1;
831
    s->restart_interval = get_bits(&s->gb, 16);
832
    s->restart_count = 0;
833
    av_log(s->avctx, AV_LOG_DEBUG, "restart interval: %d\n", s->restart_interval);
834

    
835
    return 0;
836
}
837

    
838
static int mjpeg_decode_app(MJpegDecodeContext *s)
839
{
840
    int len, id, i;
841

    
842
    len = get_bits(&s->gb, 16);
843
    if (len < 5)
844
        return -1;
845
    if(8*len + get_bits_count(&s->gb) > s->gb.size_in_bits)
846
        return -1;
847

    
848
    id = (get_bits(&s->gb, 16) << 16) | get_bits(&s->gb, 16);
849
    id = be2me_32(id);
850
    len -= 6;
851

    
852
    if(s->avctx->debug & FF_DEBUG_STARTCODE){
853
        av_log(s->avctx, AV_LOG_DEBUG, "APPx %8X\n", id);
854
    }
855

    
856
    /* buggy AVID, it puts EOI only at every 10th frame */
857
    /* also this fourcc is used by non-avid files too, it holds some
858
       informations, but it's always present in AVID creates files */
859
    if (id == ff_get_fourcc("AVI1"))
860
    {
861
        /* structure:
862
            4bytes      AVI1
863
            1bytes      polarity
864
            1bytes      always zero
865
            4bytes      field_size
866
            4bytes      field_size_less_padding
867
        */
868
            s->buggy_avid = 1;
869
//        if (s->first_picture)
870
//            printf("mjpeg: workarounding buggy AVID\n");
871
        i = get_bits(&s->gb, 8);
872
        if     (i==2) s->bottom_field= 1;
873
        else if(i==1) s->bottom_field= 0;
874
#if 0
875
        skip_bits(&s->gb, 8);
876
        skip_bits(&s->gb, 32);
877
        skip_bits(&s->gb, 32);
878
        len -= 10;
879
#endif
880
//        if (s->interlace_polarity)
881
//            printf("mjpeg: interlace polarity: %d\n", s->interlace_polarity);
882
        goto out;
883
    }
884

    
885
//    len -= 2;
886

    
887
    if (id == ff_get_fourcc("JFIF"))
888
    {
889
        int t_w, t_h, v1, v2;
890
        skip_bits(&s->gb, 8); /* the trailing zero-byte */
891
        v1= get_bits(&s->gb, 8);
892
        v2= get_bits(&s->gb, 8);
893
        skip_bits(&s->gb, 8);
894

    
895
        s->avctx->sample_aspect_ratio.num= get_bits(&s->gb, 16);
896
        s->avctx->sample_aspect_ratio.den= get_bits(&s->gb, 16);
897

    
898
        if (s->avctx->debug & FF_DEBUG_PICT_INFO)
899
            av_log(s->avctx, AV_LOG_INFO, "mjpeg: JFIF header found (version: %x.%x) SAR=%d/%d\n",
900
                v1, v2,
901
                s->avctx->sample_aspect_ratio.num,
902
                s->avctx->sample_aspect_ratio.den
903
            );
904

    
905
        t_w = get_bits(&s->gb, 8);
906
        t_h = get_bits(&s->gb, 8);
907
        if (t_w && t_h)
908
        {
909
            /* skip thumbnail */
910
            if (len-10-(t_w*t_h*3) > 0)
911
                len -= t_w*t_h*3;
912
        }
913
        len -= 10;
914
        goto out;
915
    }
916

    
917
    if (id == ff_get_fourcc("Adob") && (get_bits(&s->gb, 8) == 'e'))
918
    {
919
        if (s->avctx->debug & FF_DEBUG_PICT_INFO)
920
            av_log(s->avctx, AV_LOG_INFO, "mjpeg: Adobe header found\n");
921
        skip_bits(&s->gb, 16); /* version */
922
        skip_bits(&s->gb, 16); /* flags0 */
923
        skip_bits(&s->gb, 16); /* flags1 */
924
        skip_bits(&s->gb, 8);  /* transform */
925
        len -= 7;
926
        goto out;
927
    }
928

    
929
    if (id == ff_get_fourcc("LJIF")){
930
        if (s->avctx->debug & FF_DEBUG_PICT_INFO)
931
            av_log(s->avctx, AV_LOG_INFO, "Pegasus lossless jpeg header found\n");
932
        skip_bits(&s->gb, 16); /* version ? */
933
        skip_bits(&s->gb, 16); /* unknwon always 0? */
934
        skip_bits(&s->gb, 16); /* unknwon always 0? */
935
        skip_bits(&s->gb, 16); /* unknwon always 0? */
936
        switch( get_bits(&s->gb, 8)){
937
        case 1:
938
            s->rgb= 1;
939
            s->pegasus_rct=0;
940
            break;
941
        case 2:
942
            s->rgb= 1;
943
            s->pegasus_rct=1;
944
            break;
945
        default:
946
            av_log(s->avctx, AV_LOG_ERROR, "unknown colorspace\n");
947
        }
948
        len -= 9;
949
        goto out;
950
    }
951

    
952
    /* Apple MJPEG-A */
953
    if ((s->start_code == APP1) && (len > (0x28 - 8)))
954
    {
955
        id = (get_bits(&s->gb, 16) << 16) | get_bits(&s->gb, 16);
956
        id = be2me_32(id);
957
        len -= 4;
958
        if (id == ff_get_fourcc("mjpg")) /* Apple MJPEG-A */
959
        {
960
#if 0
961
            skip_bits(&s->gb, 32); /* field size */
962
            skip_bits(&s->gb, 32); /* pad field size */
963
            skip_bits(&s->gb, 32); /* next off */
964
            skip_bits(&s->gb, 32); /* quant off */
965
            skip_bits(&s->gb, 32); /* huff off */
966
            skip_bits(&s->gb, 32); /* image off */
967
            skip_bits(&s->gb, 32); /* scan off */
968
            skip_bits(&s->gb, 32); /* data off */
969
#endif
970
            if (s->avctx->debug & FF_DEBUG_PICT_INFO)
971
                av_log(s->avctx, AV_LOG_INFO, "mjpeg: Apple MJPEG-A header found\n");
972
        }
973
    }
974

    
975
out:
976
    /* slow but needed for extreme adobe jpegs */
977
    if (len < 0)
978
        av_log(s->avctx, AV_LOG_ERROR, "mjpeg: error, decode_app parser read over the end\n");
979
    while(--len > 0)
980
        skip_bits(&s->gb, 8);
981

    
982
    return 0;
983
}
984

    
985
static int mjpeg_decode_com(MJpegDecodeContext *s)
986
{
987
    int len = get_bits(&s->gb, 16);
988
    if (len >= 2 && 8*len - 16 + get_bits_count(&s->gb) <= s->gb.size_in_bits) {
989
        char *cbuf = av_malloc(len - 1);
990
        if (cbuf) {
991
            int i;
992
            for (i = 0; i < len - 2; i++)
993
                cbuf[i] = get_bits(&s->gb, 8);
994
            if (i > 0 && cbuf[i-1] == '\n')
995
                cbuf[i-1] = 0;
996
            else
997
                cbuf[i] = 0;
998

    
999
            if(s->avctx->debug & FF_DEBUG_PICT_INFO)
1000
                av_log(s->avctx, AV_LOG_INFO, "mjpeg comment: '%s'\n", cbuf);
1001

    
1002
            /* buggy avid, it puts EOI only at every 10th frame */
1003
            if (!strcmp(cbuf, "AVID"))
1004
            {
1005
                s->buggy_avid = 1;
1006
                //        if (s->first_picture)
1007
                //            printf("mjpeg: workarounding buggy AVID\n");
1008
            }
1009
            else if(!strcmp(cbuf, "CS=ITU601")){
1010
                s->cs_itu601= 1;
1011
            }
1012

    
1013
            av_free(cbuf);
1014
        }
1015
    }
1016

    
1017
    return 0;
1018
}
1019

    
1020
#if 0
1021
static int valid_marker_list[] =
1022
{
1023
        /* 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, a, b, c, d, e, f */
1024
/* 0 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
1025
/* 1 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
1026
/* 2 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
1027
/* 3 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
1028
/* 4 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
1029
/* 5 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
1030
/* 6 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
1031
/* 7 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
1032
/* 8 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
1033
/* 9 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
1034
/* a */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
1035
/* b */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
1036
/* c */    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1037
/* d */    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1038
/* e */    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1039
/* f */    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0,
1040
}
1041
#endif
1042

    
1043
/* return the 8 bit start code value and update the search
1044
   state. Return -1 if no start code found */
1045
static int find_marker(uint8_t **pbuf_ptr, uint8_t *buf_end)
1046
{
1047
    uint8_t *buf_ptr;
1048
    unsigned int v, v2;
1049
    int val;
1050
#ifdef DEBUG
1051
    int skipped=0;
1052
#endif
1053

    
1054
    buf_ptr = *pbuf_ptr;
1055
    while (buf_ptr < buf_end) {
1056
        v = *buf_ptr++;
1057
        v2 = *buf_ptr;
1058
        if ((v == 0xff) && (v2 >= 0xc0) && (v2 <= 0xfe) && buf_ptr < buf_end) {
1059
            val = *buf_ptr++;
1060
            goto found;
1061
        }
1062
#ifdef DEBUG
1063
        skipped++;
1064
#endif
1065
    }
1066
    val = -1;
1067
found:
1068
#ifdef DEBUG
1069
    av_log(NULL, AV_LOG_VERBOSE, "find_marker skipped %d bytes\n", skipped);
1070
#endif
1071
    *pbuf_ptr = buf_ptr;
1072
    return val;
1073
}
1074

    
1075
static int mjpeg_decode_frame(AVCodecContext *avctx,
1076
                              void *data, int *data_size,
1077
                              uint8_t *buf, int buf_size)
1078
{
1079
    MJpegDecodeContext *s = avctx->priv_data;
1080
    uint8_t *buf_end, *buf_ptr;
1081
    int start_code;
1082
    AVFrame *picture = data;
1083

    
1084
    buf_ptr = buf;
1085
    buf_end = buf + buf_size;
1086
    while (buf_ptr < buf_end) {
1087
        /* find start next marker */
1088
        start_code = find_marker(&buf_ptr, buf_end);
1089
        {
1090
            /* EOF */
1091
            if (start_code < 0) {
1092
                goto the_end;
1093
            } else {
1094
                av_log(avctx, AV_LOG_DEBUG, "marker=%x avail_size_in_buf=%d\n", start_code, buf_end - buf_ptr);
1095

    
1096
                if ((buf_end - buf_ptr) > s->buffer_size)
1097
                {
1098
                    av_free(s->buffer);
1099
                    s->buffer_size = buf_end-buf_ptr;
1100
                    s->buffer = av_malloc(s->buffer_size + FF_INPUT_BUFFER_PADDING_SIZE);
1101
                    av_log(avctx, AV_LOG_DEBUG, "buffer too small, expanding to %d bytes\n",
1102
                        s->buffer_size);
1103
                }
1104

    
1105
                /* unescape buffer of SOS, use special treatment for JPEG-LS */
1106
                if (start_code == SOS && !s->ls)
1107
                {
1108
                    uint8_t *src = buf_ptr;
1109
                    uint8_t *dst = s->buffer;
1110

    
1111
                    while (src<buf_end)
1112
                    {
1113
                        uint8_t x = *(src++);
1114

    
1115
                        *(dst++) = x;
1116
                        if (avctx->codec_id != CODEC_ID_THP)
1117
                        {
1118
                            if (x == 0xff) {
1119
                                while (src < buf_end && x == 0xff)
1120
                                    x = *(src++);
1121

    
1122
                                if (x >= 0xd0 && x <= 0xd7)
1123
                                    *(dst++) = x;
1124
                                else if (x)
1125
                                    break;
1126
                            }
1127
                        }
1128
                    }
1129
                    init_get_bits(&s->gb, s->buffer, (dst - s->buffer)*8);
1130

    
1131
                    av_log(avctx, AV_LOG_DEBUG, "escaping removed %d bytes\n",
1132
                           (buf_end - buf_ptr) - (dst - s->buffer));
1133
                }
1134
                else if(start_code == SOS && s->ls){
1135
                    uint8_t *src = buf_ptr;
1136
                    uint8_t *dst = s->buffer;
1137
                    int bit_count = 0;
1138
                    int t = 0, b = 0;
1139
                    PutBitContext pb;
1140

    
1141
                    s->cur_scan++;
1142

    
1143
                    /* find marker */
1144
                    while (src + t < buf_end){
1145
                        uint8_t x = src[t++];
1146
                        if (x == 0xff){
1147
                            while((src + t < buf_end) && x == 0xff)
1148
                                x = src[t++];
1149
                            if (x & 0x80) {
1150
                                t -= 2;
1151
                                break;
1152
                            }
1153
                        }
1154
                    }
1155
                    bit_count = t * 8;
1156

    
1157
                    init_put_bits(&pb, dst, t);
1158

    
1159
                    /* unescape bitstream */
1160
                    while(b < t){
1161
                        uint8_t x = src[b++];
1162
                        put_bits(&pb, 8, x);
1163
                        if(x == 0xFF){
1164
                            x = src[b++];
1165
                            put_bits(&pb, 7, x);
1166
                            bit_count--;
1167
                        }
1168
                    }
1169
                    flush_put_bits(&pb);
1170

    
1171
                    init_get_bits(&s->gb, dst, bit_count);
1172
                }
1173
                else
1174
                    init_get_bits(&s->gb, buf_ptr, (buf_end - buf_ptr)*8);
1175

    
1176
                s->start_code = start_code;
1177
                if(s->avctx->debug & FF_DEBUG_STARTCODE){
1178
                    av_log(avctx, AV_LOG_DEBUG, "startcode: %X\n", start_code);
1179
                }
1180

    
1181
                /* process markers */
1182
                if (start_code >= 0xd0 && start_code <= 0xd7) {
1183
                    av_log(avctx, AV_LOG_DEBUG, "restart marker: %d\n", start_code&0x0f);
1184
                    /* APP fields */
1185
                } else if (start_code >= APP0 && start_code <= APP15) {
1186
                    mjpeg_decode_app(s);
1187
                    /* Comment */
1188
                } else if (start_code == COM){
1189
                    mjpeg_decode_com(s);
1190
                }
1191

    
1192
                switch(start_code) {
1193
                case SOI:
1194
                    s->restart_interval = 0;
1195

    
1196
                    s->restart_count = 0;
1197
                    /* nothing to do on SOI */
1198
                    break;
1199
                case DQT:
1200
                    mjpeg_decode_dqt(s);
1201
                    break;
1202
                case DHT:
1203
                    if(mjpeg_decode_dht(s) < 0){
1204
                        av_log(avctx, AV_LOG_ERROR, "huffman table decode error\n");
1205
                        return -1;
1206
                    }
1207
                    break;
1208
                case SOF0:
1209
                    s->lossless=0;
1210
                    s->ls=0;
1211
                    s->progressive=0;
1212
                    if (mjpeg_decode_sof(s) < 0)
1213
                        return -1;
1214
                    break;
1215
                case SOF2:
1216
                    s->lossless=0;
1217
                    s->ls=0;
1218
                    s->progressive=1;
1219
                    if (mjpeg_decode_sof(s) < 0)
1220
                        return -1;
1221
                    break;
1222
                case SOF3:
1223
                    s->lossless=1;
1224
                    s->ls=0;
1225
                    s->progressive=0;
1226
                    if (mjpeg_decode_sof(s) < 0)
1227
                        return -1;
1228
                    break;
1229
                case SOF48:
1230
                    s->lossless=1;
1231
                    s->ls=1;
1232
                    s->progressive=0;
1233
                    if (mjpeg_decode_sof(s) < 0)
1234
                        return -1;
1235
                    break;
1236
                case LSE:
1237
                    if (ff_jpegls_decode_lse(s) < 0)
1238
                        return -1;
1239
                    break;
1240
                case EOI:
1241
                    s->cur_scan = 0;
1242
                    if ((s->buggy_avid && !s->interlaced) || s->restart_interval)
1243
                        break;
1244
eoi_parser:
1245
                    {
1246
                        if (s->interlaced) {
1247
                            s->bottom_field ^= 1;
1248
                            /* if not bottom field, do not output image yet */
1249
                            if (s->bottom_field == !s->interlace_polarity)
1250
                                goto not_the_end;
1251
                        }
1252
                        *picture = s->picture;
1253
                        *data_size = sizeof(AVFrame);
1254

    
1255
                        if(!s->lossless){
1256
                            picture->quality= FFMAX(FFMAX(s->qscale[0], s->qscale[1]), s->qscale[2]);
1257
                            picture->qstride= 0;
1258
                            picture->qscale_table= s->qscale_table;
1259
                            memset(picture->qscale_table, picture->quality, (s->width+15)/16);
1260
                            if(avctx->debug & FF_DEBUG_QP)
1261
                                av_log(avctx, AV_LOG_DEBUG, "QP: %d\n", picture->quality);
1262
                            picture->quality*= FF_QP2LAMBDA;
1263
                        }
1264

    
1265
                        goto the_end;
1266
                    }
1267
                    break;
1268
                case SOS:
1269
                    mjpeg_decode_sos(s);
1270
                    /* buggy avid puts EOI every 10-20th frame */
1271
                    /* if restart period is over process EOI */
1272
                    if ((s->buggy_avid && !s->interlaced) || s->restart_interval)
1273
                        goto eoi_parser;
1274
                    break;
1275
                case DRI:
1276
                    mjpeg_decode_dri(s);
1277
                    break;
1278
                case SOF1:
1279
                case SOF5:
1280
                case SOF6:
1281
                case SOF7:
1282
                case SOF9:
1283
                case SOF10:
1284
                case SOF11:
1285
                case SOF13:
1286
                case SOF14:
1287
                case SOF15:
1288
                case JPG:
1289
                    av_log(avctx, AV_LOG_ERROR, "mjpeg: unsupported coding type (%x)\n", start_code);
1290
                    break;
1291
//                default:
1292
//                    printf("mjpeg: unsupported marker (%x)\n", start_code);
1293
//                    break;
1294
                }
1295

    
1296
not_the_end:
1297
                /* eof process start code */
1298
                buf_ptr += (get_bits_count(&s->gb)+7)/8;
1299
                av_log(avctx, AV_LOG_DEBUG, "marker parser used %d bytes (%d bits)\n",
1300
                       (get_bits_count(&s->gb)+7)/8, get_bits_count(&s->gb));
1301
            }
1302
        }
1303
    }
1304
the_end:
1305
    av_log(avctx, AV_LOG_DEBUG, "mjpeg decode frame unused %d bytes\n", buf_end - buf_ptr);
1306
//    return buf_end - buf_ptr;
1307
    return buf_ptr - buf;
1308
}
1309

    
1310
static int mjpegb_decode_frame(AVCodecContext *avctx,
1311
                              void *data, int *data_size,
1312
                              uint8_t *buf, int buf_size)
1313
{
1314
    MJpegDecodeContext *s = avctx->priv_data;
1315
    uint8_t *buf_end, *buf_ptr;
1316
    AVFrame *picture = data;
1317
    GetBitContext hgb; /* for the header */
1318
    uint32_t dqt_offs, dht_offs, sof_offs, sos_offs, second_field_offs;
1319
    uint32_t field_size, sod_offs;
1320

    
1321
    buf_ptr = buf;
1322
    buf_end = buf + buf_size;
1323

    
1324
read_header:
1325
    /* reset on every SOI */
1326
    s->restart_interval = 0;
1327
    s->restart_count = 0;
1328
    s->mjpb_skiptosod = 0;
1329

    
1330
    init_get_bits(&hgb, buf_ptr, /*buf_size*/(buf_end - buf_ptr)*8);
1331

    
1332
    skip_bits(&hgb, 32); /* reserved zeros */
1333

    
1334
    if (get_bits_long(&hgb, 32) != MKBETAG('m','j','p','g'))
1335
    {
1336
        av_log(avctx, AV_LOG_WARNING, "not mjpeg-b (bad fourcc)\n");
1337
        return 0;
1338
    }
1339

    
1340
    field_size = get_bits_long(&hgb, 32); /* field size */
1341
    av_log(avctx, AV_LOG_DEBUG, "field size: 0x%x\n", field_size);
1342
    skip_bits(&hgb, 32); /* padded field size */
1343
    second_field_offs = get_bits_long(&hgb, 32);
1344
    av_log(avctx, AV_LOG_DEBUG, "second field offs: 0x%x\n", second_field_offs);
1345

    
1346
    dqt_offs = get_bits_long(&hgb, 32);
1347
    av_log(avctx, AV_LOG_DEBUG, "dqt offs: 0x%x\n", dqt_offs);
1348
    if (dqt_offs)
1349
    {
1350
        init_get_bits(&s->gb, buf+dqt_offs, (buf_end - (buf+dqt_offs))*8);
1351
        s->start_code = DQT;
1352
        mjpeg_decode_dqt(s);
1353
    }
1354

    
1355
    dht_offs = get_bits_long(&hgb, 32);
1356
    av_log(avctx, AV_LOG_DEBUG, "dht offs: 0x%x\n", dht_offs);
1357
    if (dht_offs)
1358
    {
1359
        init_get_bits(&s->gb, buf+dht_offs, (buf_end - (buf+dht_offs))*8);
1360
        s->start_code = DHT;
1361
        mjpeg_decode_dht(s);
1362
    }
1363

    
1364
    sof_offs = get_bits_long(&hgb, 32);
1365
    av_log(avctx, AV_LOG_DEBUG, "sof offs: 0x%x\n", sof_offs);
1366
    if (sof_offs)
1367
    {
1368
        init_get_bits(&s->gb, buf+sof_offs, (buf_end - (buf+sof_offs))*8);
1369
        s->start_code = SOF0;
1370
        if (mjpeg_decode_sof(s) < 0)
1371
            return -1;
1372
    }
1373

    
1374
    sos_offs = get_bits_long(&hgb, 32);
1375
    av_log(avctx, AV_LOG_DEBUG, "sos offs: 0x%x\n", sos_offs);
1376
    sod_offs = get_bits_long(&hgb, 32);
1377
    av_log(avctx, AV_LOG_DEBUG, "sod offs: 0x%x\n", sod_offs);
1378
    if (sos_offs)
1379
    {
1380
//        init_get_bits(&s->gb, buf+sos_offs, (buf_end - (buf+sos_offs))*8);
1381
        init_get_bits(&s->gb, buf+sos_offs, field_size*8);
1382
        s->mjpb_skiptosod = (sod_offs - sos_offs - show_bits(&s->gb, 16));
1383
        s->start_code = SOS;
1384
        mjpeg_decode_sos(s);
1385
    }
1386

    
1387
    if (s->interlaced) {
1388
        s->bottom_field ^= 1;
1389
        /* if not bottom field, do not output image yet */
1390
        if (s->bottom_field && second_field_offs)
1391
        {
1392
            buf_ptr = buf + second_field_offs;
1393
            second_field_offs = 0;
1394
            goto read_header;
1395
            }
1396
    }
1397

    
1398
    //XXX FIXME factorize, this looks very similar to the EOI code
1399

    
1400
    *picture= s->picture;
1401
    *data_size = sizeof(AVFrame);
1402

    
1403
    if(!s->lossless){
1404
        picture->quality= FFMAX(FFMAX(s->qscale[0], s->qscale[1]), s->qscale[2]);
1405
        picture->qstride= 0;
1406
        picture->qscale_table= s->qscale_table;
1407
        memset(picture->qscale_table, picture->quality, (s->width+15)/16);
1408
        if(avctx->debug & FF_DEBUG_QP)
1409
            av_log(avctx, AV_LOG_DEBUG, "QP: %d\n", picture->quality);
1410
        picture->quality*= FF_QP2LAMBDA;
1411
    }
1412

    
1413
    return buf_ptr - buf;
1414
}
1415

    
1416
#include "sp5x.h"
1417

    
1418
static int sp5x_decode_frame(AVCodecContext *avctx,
1419
                              void *data, int *data_size,
1420
                              uint8_t *buf, int buf_size)
1421
{
1422
#if 0
1423
    MJpegDecodeContext *s = avctx->priv_data;
1424
#endif
1425
    const int qscale = 5;
1426
    uint8_t *buf_ptr, *buf_end, *recoded;
1427
    int i = 0, j = 0;
1428

    
1429
    if (!avctx->width || !avctx->height)
1430
        return -1;
1431

    
1432
    buf_ptr = buf;
1433
    buf_end = buf + buf_size;
1434

    
1435
#if 1
1436
    recoded = av_mallocz(buf_size + 1024);
1437
    if (!recoded)
1438
        return -1;
1439

    
1440
    /* SOI */
1441
    recoded[j++] = 0xFF;
1442
    recoded[j++] = 0xD8;
1443

    
1444
    memcpy(recoded+j, &sp5x_data_dqt[0], sizeof(sp5x_data_dqt));
1445
    memcpy(recoded+j+5, &sp5x_quant_table[qscale * 2], 64);
1446
    memcpy(recoded+j+70, &sp5x_quant_table[(qscale * 2) + 1], 64);
1447
    j += sizeof(sp5x_data_dqt);
1448

    
1449
    memcpy(recoded+j, &sp5x_data_dht[0], sizeof(sp5x_data_dht));
1450
    j += sizeof(sp5x_data_dht);
1451

    
1452
    memcpy(recoded+j, &sp5x_data_sof[0], sizeof(sp5x_data_sof));
1453
    recoded[j+5] = (avctx->coded_height >> 8) & 0xFF;
1454
    recoded[j+6] = avctx->coded_height & 0xFF;
1455
    recoded[j+7] = (avctx->coded_width >> 8) & 0xFF;
1456
    recoded[j+8] = avctx->coded_width & 0xFF;
1457
    j += sizeof(sp5x_data_sof);
1458

    
1459
    memcpy(recoded+j, &sp5x_data_sos[0], sizeof(sp5x_data_sos));
1460
    j += sizeof(sp5x_data_sos);
1461

    
1462
    for (i = 14; i < buf_size && j < buf_size+1024-2; i++)
1463
    {
1464
        recoded[j++] = buf[i];
1465
        if (buf[i] == 0xff)
1466
            recoded[j++] = 0;
1467
    }
1468

    
1469
    /* EOI */
1470
    recoded[j++] = 0xFF;
1471
    recoded[j++] = 0xD9;
1472

    
1473
    i = mjpeg_decode_frame(avctx, data, data_size, recoded, j);
1474

    
1475
    av_free(recoded);
1476

    
1477
#else
1478
    /* SOF */
1479
    s->bits = 8;
1480
    s->width  = avctx->coded_width;
1481
    s->height = avctx->coded_height;
1482
    s->nb_components = 3;
1483
    s->component_id[0] = 0;
1484
    s->h_count[0] = 2;
1485
    s->v_count[0] = 2;
1486
    s->quant_index[0] = 0;
1487
    s->component_id[1] = 1;
1488
    s->h_count[1] = 1;
1489
    s->v_count[1] = 1;
1490
    s->quant_index[1] = 1;
1491
    s->component_id[2] = 2;
1492
    s->h_count[2] = 1;
1493
    s->v_count[2] = 1;
1494
    s->quant_index[2] = 1;
1495
    s->h_max = 2;
1496
    s->v_max = 2;
1497

    
1498
    s->qscale_table = av_mallocz((s->width+15)/16);
1499
    avctx->pix_fmt = s->cs_itu601 ? PIX_FMT_YUV420P : PIX_FMT_YUVJ420;
1500
    s->interlaced = 0;
1501

    
1502
    s->picture.reference = 0;
1503
    if (avctx->get_buffer(avctx, &s->picture) < 0)
1504
    {
1505
        av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
1506
        return -1;
1507
    }
1508

    
1509
    s->picture.pict_type = I_TYPE;
1510
    s->picture.key_frame = 1;
1511

    
1512
    for (i = 0; i < 3; i++)
1513
        s->linesize[i] = s->picture.linesize[i] << s->interlaced;
1514

    
1515
    /* DQT */
1516
    for (i = 0; i < 64; i++)
1517
    {
1518
        j = s->scantable.permutated[i];
1519
        s->quant_matrixes[0][j] = sp5x_quant_table[(qscale * 2) + i];
1520
    }
1521
    s->qscale[0] = FFMAX(
1522
        s->quant_matrixes[0][s->scantable.permutated[1]],
1523
        s->quant_matrixes[0][s->scantable.permutated[8]]) >> 1;
1524

    
1525
    for (i = 0; i < 64; i++)
1526
    {
1527
        j = s->scantable.permutated[i];
1528
        s->quant_matrixes[1][j] = sp5x_quant_table[(qscale * 2) + 1 + i];
1529
    }
1530
    s->qscale[1] = FFMAX(
1531
        s->quant_matrixes[1][s->scantable.permutated[1]],
1532
        s->quant_matrixes[1][s->scantable.permutated[8]]) >> 1;
1533

    
1534
    /* DHT */
1535

    
1536
    /* SOS */
1537
    s->comp_index[0] = 0;
1538
    s->nb_blocks[0] = s->h_count[0] * s->v_count[0];
1539
    s->h_scount[0] = s->h_count[0];
1540
    s->v_scount[0] = s->v_count[0];
1541
    s->dc_index[0] = 0;
1542
    s->ac_index[0] = 0;
1543

    
1544
    s->comp_index[1] = 1;
1545
    s->nb_blocks[1] = s->h_count[1] * s->v_count[1];
1546
    s->h_scount[1] = s->h_count[1];
1547
    s->v_scount[1] = s->v_count[1];
1548
    s->dc_index[1] = 1;
1549
    s->ac_index[1] = 1;
1550

    
1551
    s->comp_index[2] = 2;
1552
    s->nb_blocks[2] = s->h_count[2] * s->v_count[2];
1553
    s->h_scount[2] = s->h_count[2];
1554
    s->v_scount[2] = s->v_count[2];
1555
    s->dc_index[2] = 1;
1556
    s->ac_index[2] = 1;
1557

    
1558
    for (i = 0; i < 3; i++)
1559
        s->last_dc[i] = 1024;
1560

    
1561
    s->mb_width = (s->width * s->h_max * 8 -1) / (s->h_max * 8);
1562
    s->mb_height = (s->height * s->v_max * 8 -1) / (s->v_max * 8);
1563

    
1564
    init_get_bits(&s->gb, buf+14, (buf_size-14)*8);
1565

    
1566
    return mjpeg_decode_scan(s);
1567
#endif
1568

    
1569
    return i;
1570
}
1571

    
1572
static int mjpeg_decode_end(AVCodecContext *avctx)
1573
{
1574
    MJpegDecodeContext *s = avctx->priv_data;
1575
    int i, j;
1576

    
1577
    av_free(s->buffer);
1578
    av_free(s->qscale_table);
1579

    
1580
    for(i=0;i<2;i++) {
1581
        for(j=0;j<4;j++)
1582
            free_vlc(&s->vlcs[i][j]);
1583
    }
1584
    return 0;
1585
}
1586

    
1587
static int mjpega_dump_header(AVBitStreamFilterContext *bsfc, AVCodecContext *avctx, const char *args,
1588
                              uint8_t **poutbuf, int *poutbuf_size,
1589
                              const uint8_t *buf, int buf_size, int keyframe)
1590
{
1591
    uint8_t *poutbufp;
1592
    int i;
1593

    
1594
    if (avctx->codec_id != CODEC_ID_MJPEG) {
1595
        av_log(avctx, AV_LOG_ERROR, "mjpega bitstream filter only applies to mjpeg codec\n");
1596
        return 0;
1597
    }
1598

    
1599
    *poutbuf_size = 0;
1600
    *poutbuf = av_malloc(buf_size + 44 + FF_INPUT_BUFFER_PADDING_SIZE);
1601
    poutbufp = *poutbuf;
1602
    bytestream_put_byte(&poutbufp, 0xff);
1603
    bytestream_put_byte(&poutbufp, SOI);
1604
    bytestream_put_byte(&poutbufp, 0xff);
1605
    bytestream_put_byte(&poutbufp, APP1);
1606
    bytestream_put_be16(&poutbufp, 42); /* size */
1607
    bytestream_put_be32(&poutbufp, 0);
1608
    bytestream_put_buffer(&poutbufp, "mjpg", 4);
1609
    bytestream_put_be32(&poutbufp, buf_size + 44); /* field size */
1610
    bytestream_put_be32(&poutbufp, buf_size + 44); /* pad field size */
1611
    bytestream_put_be32(&poutbufp, 0);             /* next ptr */
1612

    
1613
    for (i = 0; i < buf_size - 1; i++) {
1614
        if (buf[i] == 0xff) {
1615
            switch (buf[i + 1]) {
1616
            case DQT:  /* quant off */
1617
            case DHT:  /* huff  off */
1618
            case SOF0: /* image off */
1619
                bytestream_put_be32(&poutbufp, i + 46);
1620
                break;
1621
            case SOS:
1622
                bytestream_put_be32(&poutbufp, i + 46); /* scan off */
1623
                bytestream_put_be32(&poutbufp, i + 46 + AV_RB16(buf + i + 2)); /* data off */
1624
                bytestream_put_buffer(&poutbufp, buf + 2, buf_size - 2); /* skip already written SOI */
1625
                *poutbuf_size = poutbufp - *poutbuf;
1626
                return 1;
1627
            case APP1:
1628
                if (i + 8 < buf_size && AV_RL32(buf + i + 8) == ff_get_fourcc("mjpg")) {
1629
                    av_log(avctx, AV_LOG_ERROR, "bitstream already formatted\n");
1630
                    memcpy(*poutbuf, buf, buf_size);
1631
                    *poutbuf_size = buf_size;
1632
                    return 1;
1633
                }
1634
            }
1635
        }
1636
    }
1637
    av_freep(poutbuf);
1638
    av_log(avctx, AV_LOG_ERROR, "could not find SOS marker in bitstream\n");
1639
    return 0;
1640
}
1641

    
1642
AVCodec mjpeg_decoder = {
1643
    "mjpeg",
1644
    CODEC_TYPE_VIDEO,
1645
    CODEC_ID_MJPEG,
1646
    sizeof(MJpegDecodeContext),
1647
    mjpeg_decode_init,
1648
    NULL,
1649
    mjpeg_decode_end,
1650
    mjpeg_decode_frame,
1651
    CODEC_CAP_DR1,
1652
    NULL
1653
};
1654

    
1655
AVCodec thp_decoder = {
1656
    "thp",
1657
    CODEC_TYPE_VIDEO,
1658
    CODEC_ID_THP,
1659
    sizeof(MJpegDecodeContext),
1660
    mjpeg_decode_init,
1661
    NULL,
1662
    mjpeg_decode_end,
1663
    mjpeg_decode_frame,
1664
    CODEC_CAP_DR1,
1665
    NULL
1666
};
1667

    
1668
AVCodec mjpegb_decoder = {
1669
    "mjpegb",
1670
    CODEC_TYPE_VIDEO,
1671
    CODEC_ID_MJPEGB,
1672
    sizeof(MJpegDecodeContext),
1673
    mjpeg_decode_init,
1674
    NULL,
1675
    mjpeg_decode_end,
1676
    mjpegb_decode_frame,
1677
    CODEC_CAP_DR1,
1678
    NULL
1679
};
1680

    
1681
AVCodec sp5x_decoder = {
1682
    "sp5x",
1683
    CODEC_TYPE_VIDEO,
1684
    CODEC_ID_SP5X,
1685
    sizeof(MJpegDecodeContext),
1686
    mjpeg_decode_init,
1687
    NULL,
1688
    mjpeg_decode_end,
1689
    sp5x_decode_frame,
1690
    CODEC_CAP_DR1,
1691
    NULL
1692
};
1693

    
1694
#ifdef CONFIG_MJPEGA_DUMP_HEADER_BSF
1695
AVBitStreamFilter mjpega_dump_header_bsf = {
1696
    "mjpegadump",
1697
    0,
1698
    mjpega_dump_header,
1699
};
1700
#endif