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ffmpeg / libavcodec / mjpegdec.c @ 8355572f

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1
/*
2
 * MJPEG decoder
3
 * Copyright (c) 2000, 2001 Fabrice Bellard
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 * Copyright (c) 2003 Alex Beregszaszi
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 * Copyright (c) 2003-2004 Michael Niedermayer
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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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 *
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 * This file is part of FFmpeg.
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 *
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 * FFmpeg is free software; you can redistribute it and/or
14
 * 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,
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 * 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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 */
27

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

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

    
36
#include "avcodec.h"
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#include "dsputil.h"
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#include "mjpeg.h"
39
#include "mjpegdec.h"
40
#include "jpeglsdec.h"
41

    
42

    
43
static int build_vlc(VLC *vlc, const uint8_t *bits_table, const uint8_t *val_table,
44
                      int nb_codes, int use_static, int is_ac)
45
{
46
    uint8_t huff_size[256+16];
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    uint16_t huff_code[256+16];
48

    
49
    assert(nb_codes <= 256);
50

    
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    memset(huff_size, 0, sizeof(huff_size));
52
    ff_mjpeg_build_huffman_codes(huff_size, huff_code, bits_table, val_table);
53

    
54
    if(is_ac){
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        memmove(huff_size+16, huff_size, sizeof(uint8_t)*nb_codes);
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        memmove(huff_code+16, huff_code, sizeof(uint16_t)*nb_codes);
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        memset(huff_size, 0, sizeof(uint8_t)*16);
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        memset(huff_code, 0, sizeof(uint16_t)*16);
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        nb_codes += 16;
60
    }
61

    
62
    return init_vlc(vlc, 9, nb_codes, huff_size, 1, 1, huff_code, 2, 2, use_static);
63
}
64

    
65
static void build_basic_mjpeg_vlc(MJpegDecodeContext * s) {
66
    build_vlc(&s->vlcs[0][0], ff_mjpeg_bits_dc_luminance,
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              ff_mjpeg_val_dc, 12, 0, 0);
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    build_vlc(&s->vlcs[0][1], ff_mjpeg_bits_dc_chrominance,
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              ff_mjpeg_val_dc, 12, 0, 0);
70
    build_vlc(&s->vlcs[1][0], ff_mjpeg_bits_ac_luminance,
71
              ff_mjpeg_val_ac_luminance, 251, 0, 1);
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    build_vlc(&s->vlcs[1][1], ff_mjpeg_bits_ac_chrominance,
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              ff_mjpeg_val_ac_chrominance, 251, 0, 1);
74
}
75

    
76
av_cold int ff_mjpeg_decode_init(AVCodecContext *avctx)
77
{
78
    MJpegDecodeContext *s = avctx->priv_data;
79

    
80
    s->avctx = avctx;
81
    dsputil_init(&s->dsp, avctx);
82
    ff_init_scantable(s->dsp.idct_permutation, &s->scantable, ff_zigzag_direct);
83
    s->buffer_size = 0;
84
    s->buffer = NULL;
85
    s->start_code = -1;
86
    s->first_picture = 1;
87
    s->org_height = avctx->coded_height;
88
    avctx->chroma_sample_location = AVCHROMA_LOC_CENTER;
89

    
90
    build_basic_mjpeg_vlc(s);
91

    
92
    if (avctx->flags & CODEC_FLAG_EXTERN_HUFF)
93
    {
94
        av_log(avctx, AV_LOG_INFO, "mjpeg: using external huffman table\n");
95
        init_get_bits(&s->gb, avctx->extradata, avctx->extradata_size*8);
96
        if (ff_mjpeg_decode_dht(s)) {
97
            av_log(avctx, AV_LOG_ERROR, "mjpeg: error using external huffman table, switching back to internal\n");
98
            build_basic_mjpeg_vlc(s);
99
        }
100
    }
101
    if (avctx->extradata_size > 9 &&
102
        AV_RL32(avctx->extradata + 4) == MKTAG('f','i','e','l')) {
103
        if (avctx->extradata[9] == 6) { /* quicktime icefloe 019 */
104
            s->interlace_polarity = 1; /* bottom field first */
105
            av_log(avctx, AV_LOG_DEBUG, "mjpeg bottom field first\n");
106
        }
107
    }
108

    
109
    return 0;
110
}
111

    
112

    
113
/* quantize tables */
114
int ff_mjpeg_decode_dqt(MJpegDecodeContext *s)
115
{
116
    int len, index, i, j;
117

    
118
    len = get_bits(&s->gb, 16) - 2;
119

    
120
    while (len >= 65) {
121
        /* only 8 bit precision handled */
122
        if (get_bits(&s->gb, 4) != 0)
123
        {
124
            av_log(s->avctx, AV_LOG_ERROR, "dqt: 16bit precision\n");
125
            return -1;
126
        }
127
        index = get_bits(&s->gb, 4);
128
        if (index >= 4)
129
            return -1;
130
        av_log(s->avctx, AV_LOG_DEBUG, "index=%d\n", index);
131
        /* read quant table */
132
        for(i=0;i<64;i++) {
133
            j = s->scantable.permutated[i];
134
            s->quant_matrixes[index][j] = get_bits(&s->gb, 8);
135
        }
136

    
137
        //XXX FIXME finetune, and perhaps add dc too
138
        s->qscale[index]= FFMAX(
139
            s->quant_matrixes[index][s->scantable.permutated[1]],
140
            s->quant_matrixes[index][s->scantable.permutated[8]]) >> 1;
141
        av_log(s->avctx, AV_LOG_DEBUG, "qscale[%d]: %d\n", index, s->qscale[index]);
142
        len -= 65;
143
    }
144

    
145
    return 0;
146
}
147

    
148
/* decode huffman tables and build VLC decoders */
149
int ff_mjpeg_decode_dht(MJpegDecodeContext *s)
150
{
151
    int len, index, i, class, n, v, code_max;
152
    uint8_t bits_table[17];
153
    uint8_t val_table[256];
154

    
155
    len = get_bits(&s->gb, 16) - 2;
156

    
157
    while (len > 0) {
158
        if (len < 17)
159
            return -1;
160
        class = get_bits(&s->gb, 4);
161
        if (class >= 2)
162
            return -1;
163
        index = get_bits(&s->gb, 4);
164
        if (index >= 4)
165
            return -1;
166
        n = 0;
167
        for(i=1;i<=16;i++) {
168
            bits_table[i] = get_bits(&s->gb, 8);
169
            n += bits_table[i];
170
        }
171
        len -= 17;
172
        if (len < n || n > 256)
173
            return -1;
174

    
175
        code_max = 0;
176
        for(i=0;i<n;i++) {
177
            v = get_bits(&s->gb, 8);
178
            if (v > code_max)
179
                code_max = v;
180
            val_table[i] = v;
181
        }
182
        len -= n;
183

    
184
        /* build VLC and flush previous vlc if present */
185
        free_vlc(&s->vlcs[class][index]);
186
        av_log(s->avctx, AV_LOG_DEBUG, "class=%d index=%d nb_codes=%d\n",
187
               class, index, code_max + 1);
188
        if(build_vlc(&s->vlcs[class][index], bits_table, val_table, code_max + 1, 0, class > 0) < 0){
189
            return -1;
190
        }
191
    }
192
    return 0;
193
}
194

    
195
int ff_mjpeg_decode_sof(MJpegDecodeContext *s)
196
{
197
    int len, nb_components, i, width, height, pix_fmt_id;
198

    
199
    /* XXX: verify len field validity */
200
    len = get_bits(&s->gb, 16);
201
    s->bits= get_bits(&s->gb, 8);
202

    
203
    if(s->pegasus_rct) s->bits=9;
204
    if(s->bits==9 && !s->pegasus_rct) s->rct=1;    //FIXME ugly
205

    
206
    if (s->bits != 8 && !s->lossless){
207
        av_log(s->avctx, AV_LOG_ERROR, "only 8 bits/component accepted\n");
208
        return -1;
209
    }
210

    
211
    height = get_bits(&s->gb, 16);
212
    width = get_bits(&s->gb, 16);
213

    
214
    //HACK for odd_height.mov
215
    if(s->interlaced && s->width == width && s->height == height + 1)
216
        height= s->height;
217

    
218
    av_log(s->avctx, AV_LOG_DEBUG, "sof0: picture: %dx%d\n", width, height);
219
    if(avcodec_check_dimensions(s->avctx, width, height))
220
        return -1;
221

    
222
    nb_components = get_bits(&s->gb, 8);
223
    if (nb_components <= 0 ||
224
        nb_components > MAX_COMPONENTS)
225
        return -1;
226
    if (s->ls && !(s->bits <= 8 || nb_components == 1)){
227
        av_log(s->avctx, AV_LOG_ERROR, "only <= 8 bits/component or 16-bit gray accepted for JPEG-LS\n");
228
        return -1;
229
    }
230
    s->nb_components = nb_components;
231
    s->h_max = 1;
232
    s->v_max = 1;
233
    for(i=0;i<nb_components;i++) {
234
        /* component id */
235
        s->component_id[i] = get_bits(&s->gb, 8) - 1;
236
        s->h_count[i] = get_bits(&s->gb, 4);
237
        s->v_count[i] = get_bits(&s->gb, 4);
238
        /* compute hmax and vmax (only used in interleaved case) */
239
        if (s->h_count[i] > s->h_max)
240
            s->h_max = s->h_count[i];
241
        if (s->v_count[i] > s->v_max)
242
            s->v_max = s->v_count[i];
243
        s->quant_index[i] = get_bits(&s->gb, 8);
244
        if (s->quant_index[i] >= 4)
245
            return -1;
246
        av_log(s->avctx, AV_LOG_DEBUG, "component %d %d:%d id: %d quant:%d\n", i, s->h_count[i],
247
               s->v_count[i], s->component_id[i], s->quant_index[i]);
248
    }
249

    
250
    if(s->ls && (s->h_max > 1 || s->v_max > 1)) {
251
        av_log(s->avctx, AV_LOG_ERROR, "Subsampling in JPEG-LS is not supported.\n");
252
        return -1;
253
    }
254

    
255
    if(s->v_max==1 && s->h_max==1 && s->lossless==1) s->rgb=1;
256

    
257
    /* if different size, realloc/alloc picture */
258
    /* XXX: also check h_count and v_count */
259
    if (width != s->width || height != s->height) {
260
        av_freep(&s->qscale_table);
261

    
262
        s->width = width;
263
        s->height = height;
264
        s->interlaced = 0;
265

    
266
        /* test interlaced mode */
267
        if (s->first_picture &&
268
            s->org_height != 0 &&
269
            s->height < ((s->org_height * 3) / 4)) {
270
            s->interlaced = 1;
271
            s->bottom_field = s->interlace_polarity;
272
            s->picture.interlaced_frame = 1;
273
            s->picture.top_field_first = !s->interlace_polarity;
274
            height *= 2;
275
        }
276

    
277
        avcodec_set_dimensions(s->avctx, width, height);
278

    
279
        s->qscale_table= av_mallocz((s->width+15)/16);
280

    
281
        s->first_picture = 0;
282
    }
283

    
284
    if(s->interlaced && (s->bottom_field == !s->interlace_polarity))
285
        return 0;
286

    
287
    /* XXX: not complete test ! */
288
    pix_fmt_id = (s->h_count[0] << 28) | (s->v_count[0] << 24) |
289
                 (s->h_count[1] << 20) | (s->v_count[1] << 16) |
290
                 (s->h_count[2] << 12) | (s->v_count[2] <<  8) |
291
                 (s->h_count[3] <<  4) |  s->v_count[3];
292
    av_log(s->avctx, AV_LOG_DEBUG, "pix fmt id %x\n", pix_fmt_id);
293
    if(!(pix_fmt_id & 0x10101010))
294
        pix_fmt_id-= (pix_fmt_id & 0xF0F0F0F0)>>1;
295
    if(!(pix_fmt_id & 0x01010101))
296
        pix_fmt_id-= (pix_fmt_id & 0x0F0F0F0F)>>1;
297

    
298
    switch(pix_fmt_id){
299
    case 0x11111100:
300
        if(s->rgb){
301
            s->avctx->pix_fmt = PIX_FMT_RGB32;
302
        }else
303
            s->avctx->pix_fmt = s->cs_itu601 ? PIX_FMT_YUV444P : PIX_FMT_YUVJ444P;
304
        assert(s->nb_components==3);
305
        break;
306
    case 0x11000000:
307
        s->avctx->pix_fmt = PIX_FMT_GRAY8;
308
        break;
309
    case 0x12111100:
310
        s->avctx->pix_fmt = s->cs_itu601 ? PIX_FMT_YUV440P : PIX_FMT_YUVJ440P;
311
        break;
312
    case 0x21111100:
313
        s->avctx->pix_fmt = s->cs_itu601 ? PIX_FMT_YUV422P : PIX_FMT_YUVJ422P;
314
        break;
315
    case 0x22111100:
316
        s->avctx->pix_fmt = s->cs_itu601 ? PIX_FMT_YUV420P : PIX_FMT_YUVJ420P;
317
        break;
318
    default:
319
        av_log(s->avctx, AV_LOG_ERROR, "Unhandled pixel format 0x%x\n", pix_fmt_id);
320
        return -1;
321
    }
322
    if(s->ls){
323
        if(s->nb_components > 1)
324
            s->avctx->pix_fmt = PIX_FMT_RGB24;
325
        else if(s->bits <= 8)
326
            s->avctx->pix_fmt = PIX_FMT_GRAY8;
327
        else
328
            s->avctx->pix_fmt = PIX_FMT_GRAY16;
329
    }
330

    
331
    if(s->picture.data[0])
332
        s->avctx->release_buffer(s->avctx, &s->picture);
333

    
334
    s->picture.reference= 0;
335
    if(s->avctx->get_buffer(s->avctx, &s->picture) < 0){
336
        av_log(s->avctx, AV_LOG_ERROR, "get_buffer() failed\n");
337
        return -1;
338
    }
339
    s->picture.pict_type= FF_I_TYPE;
340
    s->picture.key_frame= 1;
341
    s->got_picture = 1;
342

    
343
    for(i=0; i<3; i++){
344
        s->linesize[i]= s->picture.linesize[i] << s->interlaced;
345
    }
346

    
347
//    printf("%d %d %d %d %d %d\n", s->width, s->height, s->linesize[0], s->linesize[1], s->interlaced, s->avctx->height);
348

    
349
    if (len != (8+(3*nb_components)))
350
    {
351
        av_log(s->avctx, AV_LOG_DEBUG, "decode_sof0: error, len(%d) mismatch\n", len);
352
    }
353

    
354
    /* totally blank picture as progressive JPEG will only add details to it */
355
    if(s->progressive){
356
        int bw = (width  + s->h_max*8-1) / (s->h_max*8);
357
        int bh = (height + s->v_max*8-1) / (s->v_max*8);
358
        for(i=0; i<s->nb_components; i++) {
359
            int size = bw * bh * s->h_count[i] * s->v_count[i];
360
            av_freep(&s->blocks[i]);
361
            av_freep(&s->last_nnz[i]);
362
            s->blocks[i] = av_malloc(size * sizeof(**s->blocks));
363
            s->last_nnz[i] = av_mallocz(size * sizeof(**s->last_nnz));
364
            s->block_stride[i] = bw * s->h_count[i];
365
        }
366
        memset(s->coefs_finished, 0, sizeof(s->coefs_finished));
367
    }
368
    return 0;
369
}
370

    
371
static inline int mjpeg_decode_dc(MJpegDecodeContext *s, int dc_index)
372
{
373
    int code;
374
    code = get_vlc2(&s->gb, s->vlcs[0][dc_index].table, 9, 2);
375
    if (code < 0)
376
    {
377
        av_log(s->avctx, AV_LOG_WARNING, "mjpeg_decode_dc: bad vlc: %d:%d (%p)\n", 0, dc_index,
378
               &s->vlcs[0][dc_index]);
379
        return 0xffff;
380
    }
381

    
382
    if(code)
383
        return get_xbits(&s->gb, code);
384
    else
385
        return 0;
386
}
387

    
388
/* decode block and dequantize */
389
static int decode_block(MJpegDecodeContext *s, DCTELEM *block,
390
                        int component, int dc_index, int ac_index, int16_t *quant_matrix)
391
{
392
    int code, i, j, level, val;
393

    
394
    /* DC coef */
395
    val = mjpeg_decode_dc(s, dc_index);
396
    if (val == 0xffff) {
397
        av_log(s->avctx, AV_LOG_ERROR, "error dc\n");
398
        return -1;
399
    }
400
    val = val * quant_matrix[0] + s->last_dc[component];
401
    s->last_dc[component] = val;
402
    block[0] = val;
403
    /* AC coefs */
404
    i = 0;
405
    {OPEN_READER(re, &s->gb)
406
    for(;;) {
407
        UPDATE_CACHE(re, &s->gb);
408
        GET_VLC(code, re, &s->gb, s->vlcs[1][ac_index].table, 9, 2)
409

    
410
        /* EOB */
411
        if (code == 0x10)
412
            break;
413
        i += ((unsigned)code) >> 4;
414
        if(code != 0x100){
415
            code &= 0xf;
416
            if(code > MIN_CACHE_BITS - 16){
417
                UPDATE_CACHE(re, &s->gb)
418
            }
419
            {
420
                int cache=GET_CACHE(re,&s->gb);
421
                int sign=(~cache)>>31;
422
                level = (NEG_USR32(sign ^ cache,code) ^ sign) - sign;
423
            }
424

    
425
            LAST_SKIP_BITS(re, &s->gb, code)
426

    
427
            if (i >= 63) {
428
                if(i == 63){
429
                    j = s->scantable.permutated[63];
430
                    block[j] = level * quant_matrix[j];
431
                    break;
432
                }
433
                av_log(s->avctx, AV_LOG_ERROR, "error count: %d\n", i);
434
                return -1;
435
            }
436
            j = s->scantable.permutated[i];
437
            block[j] = level * quant_matrix[j];
438
        }
439
    }
440
    CLOSE_READER(re, &s->gb)}
441

    
442
    return 0;
443
}
444

    
445
static int decode_dc_progressive(MJpegDecodeContext *s, DCTELEM *block, int component,
446
                                 int dc_index, int16_t *quant_matrix, int Al)
447
{
448
    int val;
449
    s->dsp.clear_block(block);
450
    val = mjpeg_decode_dc(s, dc_index);
451
    if (val == 0xffff) {
452
        av_log(s->avctx, AV_LOG_ERROR, "error dc\n");
453
        return -1;
454
    }
455
    val = (val * quant_matrix[0] << Al) + s->last_dc[component];
456
    s->last_dc[component] = val;
457
    block[0] = val;
458
    return 0;
459
}
460

    
461
/* decode block and dequantize - progressive JPEG version */
462
static int decode_block_progressive(MJpegDecodeContext *s, DCTELEM *block, uint8_t *last_nnz,
463
                                    int ac_index, int16_t *quant_matrix,
464
                                    int ss, int se, int Al, int *EOBRUN)
465
{
466
    int code, i, j, level, val, run;
467

    
468
    if(*EOBRUN){
469
        (*EOBRUN)--;
470
        return 0;
471
    }
472
    {OPEN_READER(re, &s->gb)
473
    for(i=ss;;i++) {
474
        UPDATE_CACHE(re, &s->gb);
475
        GET_VLC(code, re, &s->gb, s->vlcs[1][ac_index].table, 9, 2)
476
        /* Progressive JPEG use AC coeffs from zero and this decoder sets offset 16 by default */
477
        code -= 16;
478
        if(code & 0xF) {
479
            i += ((unsigned) code) >> 4;
480
            code &= 0xf;
481
            if(code > MIN_CACHE_BITS - 16){
482
                UPDATE_CACHE(re, &s->gb)
483
            }
484
            {
485
                int cache=GET_CACHE(re,&s->gb);
486
                int sign=(~cache)>>31;
487
                level = (NEG_USR32(sign ^ cache,code) ^ sign) - sign;
488
            }
489

    
490
            LAST_SKIP_BITS(re, &s->gb, code)
491

    
492
            if (i >= se) {
493
                if(i == se){
494
                    j = s->scantable.permutated[se];
495
                    block[j] = level * quant_matrix[j] << Al;
496
                    break;
497
                }
498
                av_log(s->avctx, AV_LOG_ERROR, "error count: %d\n", i);
499
                return -1;
500
            }
501
            j = s->scantable.permutated[i];
502
            block[j] = level * quant_matrix[j] << Al;
503
        }else{
504
            run = ((unsigned) code) >> 4;
505
            if(run == 0xF){// ZRL - skip 15 coefficients
506
                i += 15;
507
            }else{
508
                val = run;
509
                run = (1 << run);
510
                UPDATE_CACHE(re, &s->gb);
511
                run += (GET_CACHE(re, &s->gb) >> (32 - val)) & (run - 1);
512
                if(val)
513
                    LAST_SKIP_BITS(re, &s->gb, val);
514
                *EOBRUN = run - 1;
515
                break;
516
            }
517
        }
518
    }
519
    CLOSE_READER(re, &s->gb)}
520
    if(i > *last_nnz)
521
        *last_nnz = i;
522
    return 0;
523
}
524

    
525
#define REFINE_BIT(j) {\
526
    UPDATE_CACHE(re, &s->gb);\
527
    sign = block[j]>>15;\
528
    block[j] += SHOW_UBITS(re, &s->gb, 1) * ((quant_matrix[j]^sign)-sign) << Al;\
529
    LAST_SKIP_BITS(re, &s->gb, 1);\
530
}
531

    
532
#define ZERO_RUN \
533
for(;;i++) {\
534
    if(i > last) {\
535
        i += run;\
536
        if(i > se) {\
537
            av_log(s->avctx, AV_LOG_ERROR, "error count: %d\n", i);\
538
            return -1;\
539
        }\
540
        break;\
541
    }\
542
    j = s->scantable.permutated[i];\
543
    if(block[j])\
544
        REFINE_BIT(j)\
545
    else if(run-- == 0)\
546
        break;\
547
}
548

    
549
/* decode block and dequantize - progressive JPEG refinement pass */
550
static int decode_block_refinement(MJpegDecodeContext *s, DCTELEM *block, uint8_t *last_nnz,
551
                        int ac_index, int16_t *quant_matrix,
552
                        int ss, int se, int Al, int *EOBRUN)
553
{
554
    int code, i=ss, j, sign, val, run;
555
    int last = FFMIN(se, *last_nnz);
556

    
557
    OPEN_READER(re, &s->gb);
558
    if(*EOBRUN)
559
        (*EOBRUN)--;
560
    else {
561
        for(;;i++) {
562
            UPDATE_CACHE(re, &s->gb);
563
            GET_VLC(code, re, &s->gb, s->vlcs[1][ac_index].table, 9, 2)
564
            /* Progressive JPEG use AC coeffs from zero and this decoder sets offset 16 by default */
565
            code -= 16;
566
            if(code & 0xF) {
567
                run = ((unsigned) code) >> 4;
568
                UPDATE_CACHE(re, &s->gb);
569
                val = SHOW_UBITS(re, &s->gb, 1);
570
                LAST_SKIP_BITS(re, &s->gb, 1);
571
                ZERO_RUN;
572
                j = s->scantable.permutated[i];
573
                val--;
574
                block[j] = ((quant_matrix[j]^val)-val) << Al;
575
                if(i == se) {
576
                    if(i > *last_nnz)
577
                        *last_nnz = i;
578
                    CLOSE_READER(re, &s->gb)
579
                    return 0;
580
                }
581
            }else{
582
                run = ((unsigned) code) >> 4;
583
                if(run == 0xF){
584
                    ZERO_RUN;
585
                }else{
586
                    val = run;
587
                    run = (1 << run);
588
                    if(val) {
589
                        UPDATE_CACHE(re, &s->gb);
590
                        run += SHOW_UBITS(re, &s->gb, val);
591
                        LAST_SKIP_BITS(re, &s->gb, val);
592
                    }
593
                    *EOBRUN = run - 1;
594
                    break;
595
                }
596
            }
597
        }
598

    
599
        if(i > *last_nnz)
600
            *last_nnz = i;
601
    }
602

    
603
    for(;i<=last;i++) {
604
        j = s->scantable.permutated[i];
605
        if(block[j])
606
            REFINE_BIT(j)
607
    }
608
    CLOSE_READER(re, &s->gb);
609

    
610
    return 0;
611
}
612
#undef REFINE_BIT
613
#undef ZERO_RUN
614

    
615
static int ljpeg_decode_rgb_scan(MJpegDecodeContext *s, int predictor, int point_transform){
616
    int i, mb_x, mb_y;
617
    uint16_t buffer[32768][4];
618
    int left[3], top[3], topleft[3];
619
    const int linesize= s->linesize[0];
620
    const int mask= (1<<s->bits)-1;
621

    
622
    if((unsigned)s->mb_width > 32768) //dynamic alloc
623
        return -1;
624

    
625
    for(i=0; i<3; i++){
626
        buffer[0][i]= 1 << (s->bits + point_transform - 1);
627
    }
628
    for(mb_y = 0; mb_y < s->mb_height; mb_y++) {
629
        const int modified_predictor= mb_y ? predictor : 1;
630
        uint8_t *ptr = s->picture.data[0] + (linesize * mb_y);
631

    
632
        if (s->interlaced && s->bottom_field)
633
            ptr += linesize >> 1;
634

    
635
        for(i=0; i<3; i++){
636
            top[i]= left[i]= topleft[i]= buffer[0][i];
637
        }
638
        for(mb_x = 0; mb_x < s->mb_width; mb_x++) {
639
            if (s->restart_interval && !s->restart_count)
640
                s->restart_count = s->restart_interval;
641

    
642
            for(i=0;i<3;i++) {
643
                int pred;
644

    
645
                topleft[i]= top[i];
646
                top[i]= buffer[mb_x][i];
647

    
648
                PREDICT(pred, topleft[i], top[i], left[i], modified_predictor);
649

    
650
                left[i]=
651
                buffer[mb_x][i]= mask & (pred + (mjpeg_decode_dc(s, s->dc_index[i]) << point_transform));
652
            }
653

    
654
            if (s->restart_interval && !--s->restart_count) {
655
                align_get_bits(&s->gb);
656
                skip_bits(&s->gb, 16); /* skip RSTn */
657
            }
658
        }
659

    
660
        if(s->rct){
661
            for(mb_x = 0; mb_x < s->mb_width; mb_x++) {
662
                ptr[4*mb_x+1] = buffer[mb_x][0] - ((buffer[mb_x][1] + buffer[mb_x][2] - 0x200)>>2);
663
                ptr[4*mb_x+0] = buffer[mb_x][1] + ptr[4*mb_x+1];
664
                ptr[4*mb_x+2] = buffer[mb_x][2] + ptr[4*mb_x+1];
665
            }
666
        }else if(s->pegasus_rct){
667
            for(mb_x = 0; mb_x < s->mb_width; mb_x++) {
668
                ptr[4*mb_x+1] = buffer[mb_x][0] - ((buffer[mb_x][1] + buffer[mb_x][2])>>2);
669
                ptr[4*mb_x+0] = buffer[mb_x][1] + ptr[4*mb_x+1];
670
                ptr[4*mb_x+2] = buffer[mb_x][2] + ptr[4*mb_x+1];
671
            }
672
        }else{
673
            for(mb_x = 0; mb_x < s->mb_width; mb_x++) {
674
                ptr[4*mb_x+0] = buffer[mb_x][0];
675
                ptr[4*mb_x+1] = buffer[mb_x][1];
676
                ptr[4*mb_x+2] = buffer[mb_x][2];
677
            }
678
        }
679
    }
680
    return 0;
681
}
682

    
683
static int ljpeg_decode_yuv_scan(MJpegDecodeContext *s, int predictor, int point_transform){
684
    int i, mb_x, mb_y;
685
    const int nb_components=3;
686

    
687
    for(mb_y = 0; mb_y < s->mb_height; mb_y++) {
688
        for(mb_x = 0; mb_x < s->mb_width; mb_x++) {
689
            if (s->restart_interval && !s->restart_count)
690
                s->restart_count = s->restart_interval;
691

    
692
            if(mb_x==0 || mb_y==0 || s->interlaced){
693
                for(i=0;i<nb_components;i++) {
694
                    uint8_t *ptr;
695
                    int n, h, v, x, y, c, j, linesize;
696
                    n = s->nb_blocks[i];
697
                    c = s->comp_index[i];
698
                    h = s->h_scount[i];
699
                    v = s->v_scount[i];
700
                    x = 0;
701
                    y = 0;
702
                    linesize= s->linesize[c];
703

    
704
                    for(j=0; j<n; j++) {
705
                        int pred;
706

    
707
                        ptr = s->picture.data[c] + (linesize * (v * mb_y + y)) + (h * mb_x + x); //FIXME optimize this crap
708
                        if(y==0 && mb_y==0){
709
                            if(x==0 && mb_x==0){
710
                                pred= 128 << point_transform;
711
                            }else{
712
                                pred= ptr[-1];
713
                            }
714
                        }else{
715
                            if(x==0 && mb_x==0){
716
                                pred= ptr[-linesize];
717
                            }else{
718
                                PREDICT(pred, ptr[-linesize-1], ptr[-linesize], ptr[-1], predictor);
719
                            }
720
                        }
721

    
722
                        if (s->interlaced && s->bottom_field)
723
                            ptr += linesize >> 1;
724
                        *ptr= pred + (mjpeg_decode_dc(s, s->dc_index[i]) << point_transform);
725

    
726
                        if (++x == h) {
727
                            x = 0;
728
                            y++;
729
                        }
730
                    }
731
                }
732
            }else{
733
                for(i=0;i<nb_components;i++) {
734
                    uint8_t *ptr;
735
                    int n, h, v, x, y, c, j, linesize;
736
                    n = s->nb_blocks[i];
737
                    c = s->comp_index[i];
738
                    h = s->h_scount[i];
739
                    v = s->v_scount[i];
740
                    x = 0;
741
                    y = 0;
742
                    linesize= s->linesize[c];
743

    
744
                    for(j=0; j<n; j++) {
745
                        int pred;
746

    
747
                        ptr = s->picture.data[c] + (linesize * (v * mb_y + y)) + (h * mb_x + x); //FIXME optimize this crap
748
                        PREDICT(pred, ptr[-linesize-1], ptr[-linesize], ptr[-1], predictor);
749
                        *ptr= pred + (mjpeg_decode_dc(s, s->dc_index[i]) << point_transform);
750
                        if (++x == h) {
751
                            x = 0;
752
                            y++;
753
                        }
754
                    }
755
                }
756
            }
757
            if (s->restart_interval && !--s->restart_count) {
758
                align_get_bits(&s->gb);
759
                skip_bits(&s->gb, 16); /* skip RSTn */
760
            }
761
        }
762
    }
763
    return 0;
764
}
765

    
766
static int mjpeg_decode_scan(MJpegDecodeContext *s, int nb_components, int Ah, int Al){
767
    int i, mb_x, mb_y;
768
    uint8_t* data[MAX_COMPONENTS];
769
    int linesize[MAX_COMPONENTS];
770

    
771
    for(i=0; i < nb_components; i++) {
772
        int c = s->comp_index[i];
773
        data[c] = s->picture.data[c];
774
        linesize[c]=s->linesize[c];
775
        s->coefs_finished[c] |= 1;
776
        if(s->avctx->codec->id==CODEC_ID_AMV) {
777
            //picture should be flipped upside-down for this codec
778
            assert(!(s->avctx->flags & CODEC_FLAG_EMU_EDGE));
779
            data[c] += (linesize[c] * (s->v_scount[i] * (8 * s->mb_height -((s->height/s->v_max)&7)) - 1 ));
780
            linesize[c] *= -1;
781
        }
782
    }
783

    
784
    for(mb_y = 0; mb_y < s->mb_height; mb_y++) {
785
        for(mb_x = 0; mb_x < s->mb_width; mb_x++) {
786
            if (s->restart_interval && !s->restart_count)
787
                s->restart_count = s->restart_interval;
788

    
789
            for(i=0;i<nb_components;i++) {
790
                uint8_t *ptr;
791
                int n, h, v, x, y, c, j;
792
                n = s->nb_blocks[i];
793
                c = s->comp_index[i];
794
                h = s->h_scount[i];
795
                v = s->v_scount[i];
796
                x = 0;
797
                y = 0;
798
                for(j=0;j<n;j++) {
799
                    ptr = data[c] +
800
                        (((linesize[c] * (v * mb_y + y) * 8) +
801
                        (h * mb_x + x) * 8) >> s->avctx->lowres);
802
                    if(s->interlaced && s->bottom_field)
803
                        ptr += linesize[c] >> 1;
804
                    if(!s->progressive) {
805
                        s->dsp.clear_block(s->block);
806
                        if(decode_block(s, s->block, i,
807
                                     s->dc_index[i], s->ac_index[i],
808
                                     s->quant_matrixes[ s->quant_index[c] ]) < 0) {
809
                            av_log(s->avctx, AV_LOG_ERROR, "error y=%d x=%d\n", mb_y, mb_x);
810
                            return -1;
811
                        }
812
                        s->dsp.idct_put(ptr, linesize[c], s->block);
813
                    } else {
814
                        int block_idx = s->block_stride[c] * (v * mb_y + y) + (h * mb_x + x);
815
                        DCTELEM *block = s->blocks[c][block_idx];
816
                        if(Ah)
817
                            block[0] += get_bits1(&s->gb) * s->quant_matrixes[ s->quant_index[c] ][0] << Al;
818
                        else if(decode_dc_progressive(s, block, i, s->dc_index[i], s->quant_matrixes[ s->quant_index[c] ], Al) < 0) {
819
                            av_log(s->avctx, AV_LOG_ERROR, "error y=%d x=%d\n", mb_y, mb_x);
820
                            return -1;
821
                        }
822
                    }
823
//                    av_log(s->avctx, AV_LOG_DEBUG, "mb: %d %d processed\n", mb_y, mb_x);
824
//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);
825
                    if (++x == h) {
826
                        x = 0;
827
                        y++;
828
                    }
829
                }
830
            }
831

    
832
            if (s->restart_interval && !--s->restart_count) {
833
                align_get_bits(&s->gb);
834
                skip_bits(&s->gb, 16); /* skip RSTn */
835
                for (i=0; i<nb_components; i++) /* reset dc */
836
                    s->last_dc[i] = 1024;
837
            }
838
        }
839
    }
840
    return 0;
841
}
842

    
843
static int mjpeg_decode_scan_progressive_ac(MJpegDecodeContext *s, int ss, int se, int Ah, int Al){
844
    int mb_x, mb_y;
845
    int EOBRUN = 0;
846
    int c = s->comp_index[0];
847
    uint8_t* data = s->picture.data[c];
848
    int linesize = s->linesize[c];
849
    int last_scan = 0;
850
    int16_t *quant_matrix = s->quant_matrixes[ s->quant_index[c] ];
851

    
852
    if(!Al) {
853
        s->coefs_finished[c] |= (1LL<<(se+1))-(1LL<<ss);
854
        last_scan = !~s->coefs_finished[c];
855
    }
856

    
857
    if(s->interlaced && s->bottom_field)
858
        data += linesize >> 1;
859

    
860
    for(mb_y = 0; mb_y < s->mb_height; mb_y++) {
861
        uint8_t *ptr = data + (mb_y*linesize*8 >> s->avctx->lowres);
862
        int block_idx = mb_y * s->block_stride[c];
863
        DCTELEM (*block)[64] = &s->blocks[c][block_idx];
864
        uint8_t *last_nnz = &s->last_nnz[c][block_idx];
865
        for(mb_x = 0; mb_x < s->mb_width; mb_x++, block++, last_nnz++) {
866
            int ret;
867
            if(Ah)
868
                ret = decode_block_refinement(s, *block, last_nnz, s->ac_index[0],
869
                                              quant_matrix, ss, se, Al, &EOBRUN);
870
            else
871
                ret = decode_block_progressive(s, *block, last_nnz, s->ac_index[0],
872
                                               quant_matrix, ss, se, Al, &EOBRUN);
873
            if(ret < 0) {
874
                av_log(s->avctx, AV_LOG_ERROR, "error y=%d x=%d\n", mb_y, mb_x);
875
                return -1;
876
            }
877
            if(last_scan) {
878
                s->dsp.idct_put(ptr, linesize, *block);
879
                ptr += 8 >> s->avctx->lowres;
880
            }
881
        }
882
    }
883
    return 0;
884
}
885

    
886
int ff_mjpeg_decode_sos(MJpegDecodeContext *s)
887
{
888
    int len, nb_components, i, h, v, predictor, point_transform;
889
    int index, id;
890
    const int block_size= s->lossless ? 1 : 8;
891
    int ilv, prev_shift;
892

    
893
    /* XXX: verify len field validity */
894
    len = get_bits(&s->gb, 16);
895
    nb_components = get_bits(&s->gb, 8);
896
    if (len != 6+2*nb_components)
897
    {
898
        av_log(s->avctx, AV_LOG_ERROR, "decode_sos: invalid len (%d)\n", len);
899
        return -1;
900
    }
901
    for(i=0;i<nb_components;i++) {
902
        id = get_bits(&s->gb, 8) - 1;
903
        av_log(s->avctx, AV_LOG_DEBUG, "component: %d\n", id);
904
        /* find component index */
905
        for(index=0;index<s->nb_components;index++)
906
            if (id == s->component_id[index])
907
                break;
908
        if (index == s->nb_components)
909
        {
910
            av_log(s->avctx, AV_LOG_ERROR, "decode_sos: index(%d) out of components\n", index);
911
            return -1;
912
        }
913

    
914
        s->comp_index[i] = index;
915

    
916
        s->nb_blocks[i] = s->h_count[index] * s->v_count[index];
917
        s->h_scount[i] = s->h_count[index];
918
        s->v_scount[i] = s->v_count[index];
919

    
920
        s->dc_index[i] = get_bits(&s->gb, 4);
921
        s->ac_index[i] = get_bits(&s->gb, 4);
922

    
923
        if (s->dc_index[i] <  0 || s->ac_index[i] < 0 ||
924
            s->dc_index[i] >= 4 || s->ac_index[i] >= 4)
925
            goto out_of_range;
926
        if (!s->vlcs[0][s->dc_index[i]].table || !s->vlcs[1][s->ac_index[i]].table)
927
            goto out_of_range;
928
    }
929

    
930
    predictor= get_bits(&s->gb, 8); /* JPEG Ss / lossless JPEG predictor /JPEG-LS NEAR */
931
    ilv= get_bits(&s->gb, 8);    /* JPEG Se / JPEG-LS ILV */
932
    prev_shift = get_bits(&s->gb, 4); /* Ah */
933
    point_transform= get_bits(&s->gb, 4); /* Al */
934

    
935
    for(i=0;i<nb_components;i++)
936
        s->last_dc[i] = 1024;
937

    
938
    if (nb_components > 1) {
939
        /* interleaved stream */
940
        s->mb_width  = (s->width  + s->h_max * block_size - 1) / (s->h_max * block_size);
941
        s->mb_height = (s->height + s->v_max * block_size - 1) / (s->v_max * block_size);
942
    } else if(!s->ls) { /* skip this for JPEG-LS */
943
        h = s->h_max / s->h_scount[0];
944
        v = s->v_max / s->v_scount[0];
945
        s->mb_width  = (s->width  + h * block_size - 1) / (h * block_size);
946
        s->mb_height = (s->height + v * block_size - 1) / (v * block_size);
947
        s->nb_blocks[0] = 1;
948
        s->h_scount[0] = 1;
949
        s->v_scount[0] = 1;
950
    }
951

    
952
    if(s->avctx->debug & FF_DEBUG_PICT_INFO)
953
        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" : "",
954
               predictor, point_transform, ilv, s->bits,
955
               s->pegasus_rct ? "PRCT" : (s->rct ? "RCT" : ""));
956

    
957

    
958
    /* mjpeg-b can have padding bytes between sos and image data, skip them */
959
    for (i = s->mjpb_skiptosod; i > 0; i--)
960
        skip_bits(&s->gb, 8);
961

    
962
    if(s->lossless){
963
        if(CONFIG_JPEGLS_DECODER && s->ls){
964
//            for(){
965
//            reset_ls_coding_parameters(s, 0);
966

    
967
            if(ff_jpegls_decode_picture(s, predictor, point_transform, ilv) < 0)
968
                return -1;
969
        }else{
970
            if(s->rgb){
971
                if(ljpeg_decode_rgb_scan(s, predictor, point_transform) < 0)
972
                    return -1;
973
            }else{
974
                if(ljpeg_decode_yuv_scan(s, predictor, point_transform) < 0)
975
                    return -1;
976
            }
977
        }
978
    }else{
979
        if(s->progressive && predictor) {
980
            if(mjpeg_decode_scan_progressive_ac(s, predictor, ilv, prev_shift, point_transform) < 0)
981
                return -1;
982
        } else {
983
            if(mjpeg_decode_scan(s, nb_components, prev_shift, point_transform) < 0)
984
                return -1;
985
        }
986
    }
987
    emms_c();
988
    return 0;
989
 out_of_range:
990
    av_log(s->avctx, AV_LOG_ERROR, "decode_sos: ac/dc index out of range\n");
991
    return -1;
992
}
993

    
994
static int mjpeg_decode_dri(MJpegDecodeContext *s)
995
{
996
    if (get_bits(&s->gb, 16) != 4)
997
        return -1;
998
    s->restart_interval = get_bits(&s->gb, 16);
999
    s->restart_count = 0;
1000
    av_log(s->avctx, AV_LOG_DEBUG, "restart interval: %d\n", s->restart_interval);
1001

    
1002
    return 0;
1003
}
1004

    
1005
static int mjpeg_decode_app(MJpegDecodeContext *s)
1006
{
1007
    int len, id, i;
1008

    
1009
    len = get_bits(&s->gb, 16);
1010
    if (len < 5)
1011
        return -1;
1012
    if(8*len + get_bits_count(&s->gb) > s->gb.size_in_bits)
1013
        return -1;
1014

    
1015
    id = (get_bits(&s->gb, 16) << 16) | get_bits(&s->gb, 16);
1016
    id = be2me_32(id);
1017
    len -= 6;
1018

    
1019
    if(s->avctx->debug & FF_DEBUG_STARTCODE){
1020
        av_log(s->avctx, AV_LOG_DEBUG, "APPx %8X\n", id);
1021
    }
1022

    
1023
    /* buggy AVID, it puts EOI only at every 10th frame */
1024
    /* also this fourcc is used by non-avid files too, it holds some
1025
       informations, but it's always present in AVID creates files */
1026
    if (id == AV_RL32("AVI1"))
1027
    {
1028
        /* structure:
1029
            4bytes      AVI1
1030
            1bytes      polarity
1031
            1bytes      always zero
1032
            4bytes      field_size
1033
            4bytes      field_size_less_padding
1034
        */
1035
            s->buggy_avid = 1;
1036
//        if (s->first_picture)
1037
//            printf("mjpeg: workarounding buggy AVID\n");
1038
        i = get_bits(&s->gb, 8);
1039
        if     (i==2) s->bottom_field= 1;
1040
        else if(i==1) s->bottom_field= 0;
1041
#if 0
1042
        skip_bits(&s->gb, 8);
1043
        skip_bits(&s->gb, 32);
1044
        skip_bits(&s->gb, 32);
1045
        len -= 10;
1046
#endif
1047
//        if (s->interlace_polarity)
1048
//            printf("mjpeg: interlace polarity: %d\n", s->interlace_polarity);
1049
        goto out;
1050
    }
1051

    
1052
//    len -= 2;
1053

    
1054
    if (id == AV_RL32("JFIF"))
1055
    {
1056
        int t_w, t_h, v1, v2;
1057
        skip_bits(&s->gb, 8); /* the trailing zero-byte */
1058
        v1= get_bits(&s->gb, 8);
1059
        v2= get_bits(&s->gb, 8);
1060
        skip_bits(&s->gb, 8);
1061

    
1062
        s->avctx->sample_aspect_ratio.num= get_bits(&s->gb, 16);
1063
        s->avctx->sample_aspect_ratio.den= get_bits(&s->gb, 16);
1064

    
1065
        if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1066
            av_log(s->avctx, AV_LOG_INFO, "mjpeg: JFIF header found (version: %x.%x) SAR=%d/%d\n",
1067
                v1, v2,
1068
                s->avctx->sample_aspect_ratio.num,
1069
                s->avctx->sample_aspect_ratio.den
1070
            );
1071

    
1072
        t_w = get_bits(&s->gb, 8);
1073
        t_h = get_bits(&s->gb, 8);
1074
        if (t_w && t_h)
1075
        {
1076
            /* skip thumbnail */
1077
            if (len-10-(t_w*t_h*3) > 0)
1078
                len -= t_w*t_h*3;
1079
        }
1080
        len -= 10;
1081
        goto out;
1082
    }
1083

    
1084
    if (id == AV_RL32("Adob") && (get_bits(&s->gb, 8) == 'e'))
1085
    {
1086
        if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1087
            av_log(s->avctx, AV_LOG_INFO, "mjpeg: Adobe header found\n");
1088
        skip_bits(&s->gb, 16); /* version */
1089
        skip_bits(&s->gb, 16); /* flags0 */
1090
        skip_bits(&s->gb, 16); /* flags1 */
1091
        skip_bits(&s->gb, 8);  /* transform */
1092
        len -= 7;
1093
        goto out;
1094
    }
1095

    
1096
    if (id == AV_RL32("LJIF")){
1097
        if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1098
            av_log(s->avctx, AV_LOG_INFO, "Pegasus lossless jpeg header found\n");
1099
        skip_bits(&s->gb, 16); /* version ? */
1100
        skip_bits(&s->gb, 16); /* unknwon always 0? */
1101
        skip_bits(&s->gb, 16); /* unknwon always 0? */
1102
        skip_bits(&s->gb, 16); /* unknwon always 0? */
1103
        switch( get_bits(&s->gb, 8)){
1104
        case 1:
1105
            s->rgb= 1;
1106
            s->pegasus_rct=0;
1107
            break;
1108
        case 2:
1109
            s->rgb= 1;
1110
            s->pegasus_rct=1;
1111
            break;
1112
        default:
1113
            av_log(s->avctx, AV_LOG_ERROR, "unknown colorspace\n");
1114
        }
1115
        len -= 9;
1116
        goto out;
1117
    }
1118

    
1119
    /* Apple MJPEG-A */
1120
    if ((s->start_code == APP1) && (len > (0x28 - 8)))
1121
    {
1122
        id = (get_bits(&s->gb, 16) << 16) | get_bits(&s->gb, 16);
1123
        id = be2me_32(id);
1124
        len -= 4;
1125
        if (id == AV_RL32("mjpg")) /* Apple MJPEG-A */
1126
        {
1127
#if 0
1128
            skip_bits(&s->gb, 32); /* field size */
1129
            skip_bits(&s->gb, 32); /* pad field size */
1130
            skip_bits(&s->gb, 32); /* next off */
1131
            skip_bits(&s->gb, 32); /* quant off */
1132
            skip_bits(&s->gb, 32); /* huff off */
1133
            skip_bits(&s->gb, 32); /* image off */
1134
            skip_bits(&s->gb, 32); /* scan off */
1135
            skip_bits(&s->gb, 32); /* data off */
1136
#endif
1137
            if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1138
                av_log(s->avctx, AV_LOG_INFO, "mjpeg: Apple MJPEG-A header found\n");
1139
        }
1140
    }
1141

    
1142
out:
1143
    /* slow but needed for extreme adobe jpegs */
1144
    if (len < 0)
1145
        av_log(s->avctx, AV_LOG_ERROR, "mjpeg: error, decode_app parser read over the end\n");
1146
    while(--len > 0)
1147
        skip_bits(&s->gb, 8);
1148

    
1149
    return 0;
1150
}
1151

    
1152
static int mjpeg_decode_com(MJpegDecodeContext *s)
1153
{
1154
    int len = get_bits(&s->gb, 16);
1155
    if (len >= 2 && 8*len - 16 + get_bits_count(&s->gb) <= s->gb.size_in_bits) {
1156
        char *cbuf = av_malloc(len - 1);
1157
        if (cbuf) {
1158
            int i;
1159
            for (i = 0; i < len - 2; i++)
1160
                cbuf[i] = get_bits(&s->gb, 8);
1161
            if (i > 0 && cbuf[i-1] == '\n')
1162
                cbuf[i-1] = 0;
1163
            else
1164
                cbuf[i] = 0;
1165

    
1166
            if(s->avctx->debug & FF_DEBUG_PICT_INFO)
1167
                av_log(s->avctx, AV_LOG_INFO, "mjpeg comment: '%s'\n", cbuf);
1168

    
1169
            /* buggy avid, it puts EOI only at every 10th frame */
1170
            if (!strcmp(cbuf, "AVID"))
1171
            {
1172
                s->buggy_avid = 1;
1173
                //        if (s->first_picture)
1174
                //            printf("mjpeg: workarounding buggy AVID\n");
1175
            }
1176
            else if(!strcmp(cbuf, "CS=ITU601")){
1177
                s->cs_itu601= 1;
1178
            }
1179

    
1180
            av_free(cbuf);
1181
        }
1182
    }
1183

    
1184
    return 0;
1185
}
1186

    
1187
#if 0
1188
static int valid_marker_list[] =
1189
{
1190
        /* 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, a, b, c, d, e, f */
1191
/* 0 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
1192
/* 1 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
1193
/* 2 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
1194
/* 3 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
1195
/* 4 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
1196
/* 5 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
1197
/* 6 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
1198
/* 7 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
1199
/* 8 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
1200
/* 9 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
1201
/* a */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
1202
/* b */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
1203
/* c */    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1204
/* d */    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1205
/* e */    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1206
/* f */    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0,
1207
}
1208
#endif
1209

    
1210
/* return the 8 bit start code value and update the search
1211
   state. Return -1 if no start code found */
1212
static int find_marker(const uint8_t **pbuf_ptr, const uint8_t *buf_end)
1213
{
1214
    const uint8_t *buf_ptr;
1215
    unsigned int v, v2;
1216
    int val;
1217
#ifdef DEBUG
1218
    int skipped=0;
1219
#endif
1220

    
1221
    buf_ptr = *pbuf_ptr;
1222
    while (buf_ptr < buf_end) {
1223
        v = *buf_ptr++;
1224
        v2 = *buf_ptr;
1225
        if ((v == 0xff) && (v2 >= 0xc0) && (v2 <= 0xfe) && buf_ptr < buf_end) {
1226
            val = *buf_ptr++;
1227
            goto found;
1228
        }
1229
#ifdef DEBUG
1230
        skipped++;
1231
#endif
1232
    }
1233
    val = -1;
1234
found:
1235
    dprintf(NULL, "find_marker skipped %d bytes\n", skipped);
1236
    *pbuf_ptr = buf_ptr;
1237
    return val;
1238
}
1239

    
1240
int ff_mjpeg_decode_frame(AVCodecContext *avctx,
1241
                              void *data, int *data_size,
1242
                              AVPacket *avpkt)
1243
{
1244
    const uint8_t *buf = avpkt->data;
1245
    int buf_size = avpkt->size;
1246
    MJpegDecodeContext *s = avctx->priv_data;
1247
    const uint8_t *buf_end, *buf_ptr;
1248
    int start_code;
1249
    AVFrame *picture = data;
1250

    
1251
    s->got_picture = 0; // picture from previous image can not be reused
1252
    buf_ptr = buf;
1253
    buf_end = buf + buf_size;
1254
    while (buf_ptr < buf_end) {
1255
        /* find start next marker */
1256
        start_code = find_marker(&buf_ptr, buf_end);
1257
        {
1258
            /* EOF */
1259
            if (start_code < 0) {
1260
                goto the_end;
1261
            } else {
1262
                av_log(avctx, AV_LOG_DEBUG, "marker=%x avail_size_in_buf=%td\n", start_code, buf_end - buf_ptr);
1263

    
1264
                if ((buf_end - buf_ptr) > s->buffer_size)
1265
                {
1266
                    av_free(s->buffer);
1267
                    s->buffer_size = buf_end-buf_ptr;
1268
                    s->buffer = av_malloc(s->buffer_size + FF_INPUT_BUFFER_PADDING_SIZE);
1269
                    av_log(avctx, AV_LOG_DEBUG, "buffer too small, expanding to %d bytes\n",
1270
                        s->buffer_size);
1271
                }
1272

    
1273
                /* unescape buffer of SOS, use special treatment for JPEG-LS */
1274
                if (start_code == SOS && !s->ls)
1275
                {
1276
                    const uint8_t *src = buf_ptr;
1277
                    uint8_t *dst = s->buffer;
1278

    
1279
                    while (src<buf_end)
1280
                    {
1281
                        uint8_t x = *(src++);
1282

    
1283
                        *(dst++) = x;
1284
                        if (avctx->codec_id != CODEC_ID_THP)
1285
                        {
1286
                            if (x == 0xff) {
1287
                                while (src < buf_end && x == 0xff)
1288
                                    x = *(src++);
1289

    
1290
                                if (x >= 0xd0 && x <= 0xd7)
1291
                                    *(dst++) = x;
1292
                                else if (x)
1293
                                    break;
1294
                            }
1295
                        }
1296
                    }
1297
                    init_get_bits(&s->gb, s->buffer, (dst - s->buffer)*8);
1298

    
1299
                    av_log(avctx, AV_LOG_DEBUG, "escaping removed %td bytes\n",
1300
                           (buf_end - buf_ptr) - (dst - s->buffer));
1301
                }
1302
                else if(start_code == SOS && s->ls){
1303
                    const uint8_t *src = buf_ptr;
1304
                    uint8_t *dst = s->buffer;
1305
                    int bit_count = 0;
1306
                    int t = 0, b = 0;
1307
                    PutBitContext pb;
1308

    
1309
                    s->cur_scan++;
1310

    
1311
                    /* find marker */
1312
                    while (src + t < buf_end){
1313
                        uint8_t x = src[t++];
1314
                        if (x == 0xff){
1315
                            while((src + t < buf_end) && x == 0xff)
1316
                                x = src[t++];
1317
                            if (x & 0x80) {
1318
                                t -= 2;
1319
                                break;
1320
                            }
1321
                        }
1322
                    }
1323
                    bit_count = t * 8;
1324

    
1325
                    init_put_bits(&pb, dst, t);
1326

    
1327
                    /* unescape bitstream */
1328
                    while(b < t){
1329
                        uint8_t x = src[b++];
1330
                        put_bits(&pb, 8, x);
1331
                        if(x == 0xFF){
1332
                            x = src[b++];
1333
                            put_bits(&pb, 7, x);
1334
                            bit_count--;
1335
                        }
1336
                    }
1337
                    flush_put_bits(&pb);
1338

    
1339
                    init_get_bits(&s->gb, dst, bit_count);
1340
                }
1341
                else
1342
                    init_get_bits(&s->gb, buf_ptr, (buf_end - buf_ptr)*8);
1343

    
1344
                s->start_code = start_code;
1345
                if(s->avctx->debug & FF_DEBUG_STARTCODE){
1346
                    av_log(avctx, AV_LOG_DEBUG, "startcode: %X\n", start_code);
1347
                }
1348

    
1349
                /* process markers */
1350
                if (start_code >= 0xd0 && start_code <= 0xd7) {
1351
                    av_log(avctx, AV_LOG_DEBUG, "restart marker: %d\n", start_code&0x0f);
1352
                    /* APP fields */
1353
                } else if (start_code >= APP0 && start_code <= APP15) {
1354
                    mjpeg_decode_app(s);
1355
                    /* Comment */
1356
                } else if (start_code == COM){
1357
                    mjpeg_decode_com(s);
1358
                }
1359

    
1360
                switch(start_code) {
1361
                case SOI:
1362
                    s->restart_interval = 0;
1363

    
1364
                    s->restart_count = 0;
1365
                    /* nothing to do on SOI */
1366
                    break;
1367
                case DQT:
1368
                    ff_mjpeg_decode_dqt(s);
1369
                    break;
1370
                case DHT:
1371
                    if(ff_mjpeg_decode_dht(s) < 0){
1372
                        av_log(avctx, AV_LOG_ERROR, "huffman table decode error\n");
1373
                        return -1;
1374
                    }
1375
                    break;
1376
                case SOF0:
1377
                case SOF1:
1378
                    s->lossless=0;
1379
                    s->ls=0;
1380
                    s->progressive=0;
1381
                    if (ff_mjpeg_decode_sof(s) < 0)
1382
                        return -1;
1383
                    break;
1384
                case SOF2:
1385
                    s->lossless=0;
1386
                    s->ls=0;
1387
                    s->progressive=1;
1388
                    if (ff_mjpeg_decode_sof(s) < 0)
1389
                        return -1;
1390
                    break;
1391
                case SOF3:
1392
                    s->lossless=1;
1393
                    s->ls=0;
1394
                    s->progressive=0;
1395
                    if (ff_mjpeg_decode_sof(s) < 0)
1396
                        return -1;
1397
                    break;
1398
                case SOF48:
1399
                    s->lossless=1;
1400
                    s->ls=1;
1401
                    s->progressive=0;
1402
                    if (ff_mjpeg_decode_sof(s) < 0)
1403
                        return -1;
1404
                    break;
1405
                case LSE:
1406
                    if (!CONFIG_JPEGLS_DECODER || ff_jpegls_decode_lse(s) < 0)
1407
                        return -1;
1408
                    break;
1409
                case EOI:
1410
                    s->cur_scan = 0;
1411
                    if ((s->buggy_avid && !s->interlaced) || s->restart_interval)
1412
                        break;
1413
eoi_parser:
1414
                    if (!s->got_picture) {
1415
                        av_log(avctx, AV_LOG_WARNING, "Found EOI before any SOF, ignoring\n");
1416
                        break;
1417
                    }
1418
                    {
1419
                        if (s->interlaced) {
1420
                            s->bottom_field ^= 1;
1421
                            /* if not bottom field, do not output image yet */
1422
                            if (s->bottom_field == !s->interlace_polarity)
1423
                                goto not_the_end;
1424
                        }
1425
                        *picture = s->picture;
1426
                        *data_size = sizeof(AVFrame);
1427

    
1428
                        if(!s->lossless){
1429
                            picture->quality= FFMAX3(s->qscale[0], s->qscale[1], s->qscale[2]);
1430
                            picture->qstride= 0;
1431
                            picture->qscale_table= s->qscale_table;
1432
                            memset(picture->qscale_table, picture->quality, (s->width+15)/16);
1433
                            if(avctx->debug & FF_DEBUG_QP)
1434
                                av_log(avctx, AV_LOG_DEBUG, "QP: %d\n", picture->quality);
1435
                            picture->quality*= FF_QP2LAMBDA;
1436
                        }
1437

    
1438
                        goto the_end;
1439
                    }
1440
                    break;
1441
                case SOS:
1442
                    if (!s->got_picture) {
1443
                        av_log(avctx, AV_LOG_WARNING, "Can not process SOS before SOF, skipping\n");
1444
                        break;
1445
                    }
1446
                    ff_mjpeg_decode_sos(s);
1447
                    /* buggy avid puts EOI every 10-20th frame */
1448
                    /* if restart period is over process EOI */
1449
                    if ((s->buggy_avid && !s->interlaced) || s->restart_interval)
1450
                        goto eoi_parser;
1451
                    break;
1452
                case DRI:
1453
                    mjpeg_decode_dri(s);
1454
                    break;
1455
                case SOF5:
1456
                case SOF6:
1457
                case SOF7:
1458
                case SOF9:
1459
                case SOF10:
1460
                case SOF11:
1461
                case SOF13:
1462
                case SOF14:
1463
                case SOF15:
1464
                case JPG:
1465
                    av_log(avctx, AV_LOG_ERROR, "mjpeg: unsupported coding type (%x)\n", start_code);
1466
                    break;
1467
//                default:
1468
//                    printf("mjpeg: unsupported marker (%x)\n", start_code);
1469
//                    break;
1470
                }
1471

    
1472
not_the_end:
1473
                /* eof process start code */
1474
                buf_ptr += (get_bits_count(&s->gb)+7)/8;
1475
                av_log(avctx, AV_LOG_DEBUG, "marker parser used %d bytes (%d bits)\n",
1476
                       (get_bits_count(&s->gb)+7)/8, get_bits_count(&s->gb));
1477
            }
1478
        }
1479
    }
1480
    if (s->got_picture) {
1481
        av_log(avctx, AV_LOG_WARNING, "EOI missing, emulating\n");
1482
        goto eoi_parser;
1483
    }
1484
    av_log(avctx, AV_LOG_FATAL, "No JPEG data found in image\n");
1485
    return -1;
1486
the_end:
1487
    av_log(avctx, AV_LOG_DEBUG, "mjpeg decode frame unused %td bytes\n", buf_end - buf_ptr);
1488
//    return buf_end - buf_ptr;
1489
    return buf_ptr - buf;
1490
}
1491

    
1492
av_cold int ff_mjpeg_decode_end(AVCodecContext *avctx)
1493
{
1494
    MJpegDecodeContext *s = avctx->priv_data;
1495
    int i, j;
1496

    
1497
    av_free(s->buffer);
1498
    av_free(s->qscale_table);
1499

    
1500
    for(i=0;i<2;i++) {
1501
        for(j=0;j<4;j++)
1502
            free_vlc(&s->vlcs[i][j]);
1503
    }
1504
    for(i=0; i<MAX_COMPONENTS; i++) {
1505
        av_freep(&s->blocks[i]);
1506
        av_freep(&s->last_nnz[i]);
1507
    }
1508
    return 0;
1509
}
1510

    
1511
AVCodec mjpeg_decoder = {
1512
    "mjpeg",
1513
    CODEC_TYPE_VIDEO,
1514
    CODEC_ID_MJPEG,
1515
    sizeof(MJpegDecodeContext),
1516
    ff_mjpeg_decode_init,
1517
    NULL,
1518
    ff_mjpeg_decode_end,
1519
    ff_mjpeg_decode_frame,
1520
    CODEC_CAP_DR1,
1521
    NULL,
1522
    .long_name = NULL_IF_CONFIG_SMALL("MJPEG (Motion JPEG)"),
1523
};
1524

    
1525
AVCodec thp_decoder = {
1526
    "thp",
1527
    CODEC_TYPE_VIDEO,
1528
    CODEC_ID_THP,
1529
    sizeof(MJpegDecodeContext),
1530
    ff_mjpeg_decode_init,
1531
    NULL,
1532
    ff_mjpeg_decode_end,
1533
    ff_mjpeg_decode_frame,
1534
    CODEC_CAP_DR1,
1535
    NULL,
1536
    .long_name = NULL_IF_CONFIG_SMALL("Nintendo Gamecube THP video"),
1537
};