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ffmpeg / libavcodec / mjpegdec.c @ 72415b2a

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1
/*
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 * 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"
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#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);
59
        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) {
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    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,
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              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
    if (avctx->codec->id == CODEC_ID_AMV)
109
        s->flipped = 1;
110

    
111
    return 0;
112
}
113

    
114

    
115
/* quantize tables */
116
int ff_mjpeg_decode_dqt(MJpegDecodeContext *s)
117
{
118
    int len, index, i, j;
119

    
120
    len = get_bits(&s->gb, 16) - 2;
121

    
122
    while (len >= 65) {
123
        /* only 8 bit precision handled */
124
        if (get_bits(&s->gb, 4) != 0)
125
        {
126
            av_log(s->avctx, AV_LOG_ERROR, "dqt: 16bit precision\n");
127
            return -1;
128
        }
129
        index = get_bits(&s->gb, 4);
130
        if (index >= 4)
131
            return -1;
132
        av_log(s->avctx, AV_LOG_DEBUG, "index=%d\n", index);
133
        /* read quant table */
134
        for(i=0;i<64;i++) {
135
            j = s->scantable.permutated[i];
136
            s->quant_matrixes[index][j] = get_bits(&s->gb, 8);
137
        }
138

    
139
        //XXX FIXME finetune, and perhaps add dc too
140
        s->qscale[index]= FFMAX(
141
            s->quant_matrixes[index][s->scantable.permutated[1]],
142
            s->quant_matrixes[index][s->scantable.permutated[8]]) >> 1;
143
        av_log(s->avctx, AV_LOG_DEBUG, "qscale[%d]: %d\n", index, s->qscale[index]);
144
        len -= 65;
145
    }
146

    
147
    return 0;
148
}
149

    
150
/* decode huffman tables and build VLC decoders */
151
int ff_mjpeg_decode_dht(MJpegDecodeContext *s)
152
{
153
    int len, index, i, class, n, v, code_max;
154
    uint8_t bits_table[17];
155
    uint8_t val_table[256];
156

    
157
    len = get_bits(&s->gb, 16) - 2;
158

    
159
    while (len > 0) {
160
        if (len < 17)
161
            return -1;
162
        class = get_bits(&s->gb, 4);
163
        if (class >= 2)
164
            return -1;
165
        index = get_bits(&s->gb, 4);
166
        if (index >= 4)
167
            return -1;
168
        n = 0;
169
        for(i=1;i<=16;i++) {
170
            bits_table[i] = get_bits(&s->gb, 8);
171
            n += bits_table[i];
172
        }
173
        len -= 17;
174
        if (len < n || n > 256)
175
            return -1;
176

    
177
        code_max = 0;
178
        for(i=0;i<n;i++) {
179
            v = get_bits(&s->gb, 8);
180
            if (v > code_max)
181
                code_max = v;
182
            val_table[i] = v;
183
        }
184
        len -= n;
185

    
186
        /* build VLC and flush previous vlc if present */
187
        free_vlc(&s->vlcs[class][index]);
188
        av_log(s->avctx, AV_LOG_DEBUG, "class=%d index=%d nb_codes=%d\n",
189
               class, index, code_max + 1);
190
        if(build_vlc(&s->vlcs[class][index], bits_table, val_table, code_max + 1, 0, class > 0) < 0){
191
            return -1;
192
        }
193
    }
194
    return 0;
195
}
196

    
197
int ff_mjpeg_decode_sof(MJpegDecodeContext *s)
198
{
199
    int len, nb_components, i, width, height, pix_fmt_id;
200

    
201
    /* XXX: verify len field validity */
202
    len = get_bits(&s->gb, 16);
203
    s->bits= get_bits(&s->gb, 8);
204

    
205
    if(s->pegasus_rct) s->bits=9;
206
    if(s->bits==9 && !s->pegasus_rct) s->rct=1;    //FIXME ugly
207

    
208
    if (s->bits != 8 && !s->lossless){
209
        av_log(s->avctx, AV_LOG_ERROR, "only 8 bits/component accepted\n");
210
        return -1;
211
    }
212

    
213
    height = get_bits(&s->gb, 16);
214
    width = get_bits(&s->gb, 16);
215

    
216
    //HACK for odd_height.mov
217
    if(s->interlaced && s->width == width && s->height == height + 1)
218
        height= s->height;
219

    
220
    av_log(s->avctx, AV_LOG_DEBUG, "sof0: picture: %dx%d\n", width, height);
221
    if(avcodec_check_dimensions(s->avctx, width, height))
222
        return -1;
223

    
224
    nb_components = get_bits(&s->gb, 8);
225
    if (nb_components <= 0 ||
226
        nb_components > MAX_COMPONENTS)
227
        return -1;
228
    if (s->ls && !(s->bits <= 8 || nb_components == 1)){
229
        av_log(s->avctx, AV_LOG_ERROR, "only <= 8 bits/component or 16-bit gray accepted for JPEG-LS\n");
230
        return -1;
231
    }
232
    s->nb_components = nb_components;
233
    s->h_max = 1;
234
    s->v_max = 1;
235
    for(i=0;i<nb_components;i++) {
236
        /* component id */
237
        s->component_id[i] = get_bits(&s->gb, 8) - 1;
238
        s->h_count[i] = get_bits(&s->gb, 4);
239
        s->v_count[i] = get_bits(&s->gb, 4);
240
        /* compute hmax and vmax (only used in interleaved case) */
241
        if (s->h_count[i] > s->h_max)
242
            s->h_max = s->h_count[i];
243
        if (s->v_count[i] > s->v_max)
244
            s->v_max = s->v_count[i];
245
        s->quant_index[i] = get_bits(&s->gb, 8);
246
        if (s->quant_index[i] >= 4)
247
            return -1;
248
        av_log(s->avctx, AV_LOG_DEBUG, "component %d %d:%d id: %d quant:%d\n", i, s->h_count[i],
249
               s->v_count[i], s->component_id[i], s->quant_index[i]);
250
    }
251

    
252
    if(s->ls && (s->h_max > 1 || s->v_max > 1)) {
253
        av_log(s->avctx, AV_LOG_ERROR, "Subsampling in JPEG-LS is not supported.\n");
254
        return -1;
255
    }
256

    
257
    if(s->v_max==1 && s->h_max==1 && s->lossless==1) s->rgb=1;
258

    
259
    /* if different size, realloc/alloc picture */
260
    /* XXX: also check h_count and v_count */
261
    if (width != s->width || height != s->height) {
262
        av_freep(&s->qscale_table);
263

    
264
        s->width = width;
265
        s->height = height;
266
        s->interlaced = 0;
267

    
268
        /* test interlaced mode */
269
        if (s->first_picture &&
270
            s->org_height != 0 &&
271
            s->height < ((s->org_height * 3) / 4)) {
272
            s->interlaced = 1;
273
            s->bottom_field = s->interlace_polarity;
274
            s->picture.interlaced_frame = 1;
275
            s->picture.top_field_first = !s->interlace_polarity;
276
            height *= 2;
277
        }
278

    
279
        avcodec_set_dimensions(s->avctx, width, height);
280

    
281
        s->qscale_table= av_mallocz((s->width+15)/16);
282

    
283
        s->first_picture = 0;
284
    }
285

    
286
    if(s->interlaced && (s->bottom_field == !s->interlace_polarity))
287
        return 0;
288

    
289
    /* XXX: not complete test ! */
290
    pix_fmt_id = (s->h_count[0] << 28) | (s->v_count[0] << 24) |
291
                 (s->h_count[1] << 20) | (s->v_count[1] << 16) |
292
                 (s->h_count[2] << 12) | (s->v_count[2] <<  8) |
293
                 (s->h_count[3] <<  4) |  s->v_count[3];
294
    av_log(s->avctx, AV_LOG_DEBUG, "pix fmt id %x\n", pix_fmt_id);
295
    //NOTE we do not allocate pictures large enough for the possible padding of h/v_count being 4
296
    if(!(pix_fmt_id & 0xD0D0D0D0))
297
        pix_fmt_id-= (pix_fmt_id & 0xF0F0F0F0)>>1;
298
    if(!(pix_fmt_id & 0x0D0D0D0D))
299
        pix_fmt_id-= (pix_fmt_id & 0x0F0F0F0F)>>1;
300

    
301
    switch(pix_fmt_id){
302
    case 0x11111100:
303
        if(s->rgb){
304
            s->avctx->pix_fmt = PIX_FMT_BGRA;
305
        }else
306
            s->avctx->pix_fmt = s->cs_itu601 ? PIX_FMT_YUV444P : PIX_FMT_YUVJ444P;
307
        assert(s->nb_components==3);
308
        break;
309
    case 0x11000000:
310
        s->avctx->pix_fmt = PIX_FMT_GRAY8;
311
        break;
312
    case 0x12111100:
313
        s->avctx->pix_fmt = s->cs_itu601 ? PIX_FMT_YUV440P : PIX_FMT_YUVJ440P;
314
        break;
315
    case 0x21111100:
316
        s->avctx->pix_fmt = s->cs_itu601 ? PIX_FMT_YUV422P : PIX_FMT_YUVJ422P;
317
        break;
318
    case 0x22111100:
319
        s->avctx->pix_fmt = s->cs_itu601 ? PIX_FMT_YUV420P : PIX_FMT_YUVJ420P;
320
        break;
321
    default:
322
        av_log(s->avctx, AV_LOG_ERROR, "Unhandled pixel format 0x%x\n", pix_fmt_id);
323
        return -1;
324
    }
325
    if(s->ls){
326
        if(s->nb_components > 1)
327
            s->avctx->pix_fmt = PIX_FMT_RGB24;
328
        else if(s->bits <= 8)
329
            s->avctx->pix_fmt = PIX_FMT_GRAY8;
330
        else
331
            s->avctx->pix_fmt = PIX_FMT_GRAY16;
332
    }
333

    
334
    if(s->picture.data[0])
335
        s->avctx->release_buffer(s->avctx, &s->picture);
336

    
337
    s->picture.reference= 0;
338
    if(s->avctx->get_buffer(s->avctx, &s->picture) < 0){
339
        av_log(s->avctx, AV_LOG_ERROR, "get_buffer() failed\n");
340
        return -1;
341
    }
342
    s->picture.pict_type= FF_I_TYPE;
343
    s->picture.key_frame= 1;
344
    s->got_picture = 1;
345

    
346
    for(i=0; i<3; i++){
347
        s->linesize[i]= s->picture.linesize[i] << s->interlaced;
348
    }
349

    
350
//    printf("%d %d %d %d %d %d\n", s->width, s->height, s->linesize[0], s->linesize[1], s->interlaced, s->avctx->height);
351

    
352
    if (len != (8+(3*nb_components)))
353
    {
354
        av_log(s->avctx, AV_LOG_DEBUG, "decode_sof0: error, len(%d) mismatch\n", len);
355
    }
356

    
357
    /* totally blank picture as progressive JPEG will only add details to it */
358
    if(s->progressive){
359
        int bw = (width  + s->h_max*8-1) / (s->h_max*8);
360
        int bh = (height + s->v_max*8-1) / (s->v_max*8);
361
        for(i=0; i<s->nb_components; i++) {
362
            int size = bw * bh * s->h_count[i] * s->v_count[i];
363
            av_freep(&s->blocks[i]);
364
            av_freep(&s->last_nnz[i]);
365
            s->blocks[i] = av_malloc(size * sizeof(**s->blocks));
366
            s->last_nnz[i] = av_mallocz(size * sizeof(**s->last_nnz));
367
            s->block_stride[i] = bw * s->h_count[i];
368
        }
369
        memset(s->coefs_finished, 0, sizeof(s->coefs_finished));
370
    }
371
    return 0;
372
}
373

    
374
static inline int mjpeg_decode_dc(MJpegDecodeContext *s, int dc_index)
375
{
376
    int code;
377
    code = get_vlc2(&s->gb, s->vlcs[0][dc_index].table, 9, 2);
378
    if (code < 0)
379
    {
380
        av_log(s->avctx, AV_LOG_WARNING, "mjpeg_decode_dc: bad vlc: %d:%d (%p)\n", 0, dc_index,
381
               &s->vlcs[0][dc_index]);
382
        return 0xffff;
383
    }
384

    
385
    if(code)
386
        return get_xbits(&s->gb, code);
387
    else
388
        return 0;
389
}
390

    
391
/* decode block and dequantize */
392
static int decode_block(MJpegDecodeContext *s, DCTELEM *block,
393
                        int component, int dc_index, int ac_index, int16_t *quant_matrix)
394
{
395
    int code, i, j, level, val;
396

    
397
    /* DC coef */
398
    val = mjpeg_decode_dc(s, dc_index);
399
    if (val == 0xffff) {
400
        av_log(s->avctx, AV_LOG_ERROR, "error dc\n");
401
        return -1;
402
    }
403
    val = val * quant_matrix[0] + s->last_dc[component];
404
    s->last_dc[component] = val;
405
    block[0] = val;
406
    /* AC coefs */
407
    i = 0;
408
    {OPEN_READER(re, &s->gb)
409
    for(;;) {
410
        UPDATE_CACHE(re, &s->gb);
411
        GET_VLC(code, re, &s->gb, s->vlcs[1][ac_index].table, 9, 2)
412

    
413
        /* EOB */
414
        if (code == 0x10)
415
            break;
416
        i += ((unsigned)code) >> 4;
417
        if(code != 0x100){
418
            code &= 0xf;
419
            if(code > MIN_CACHE_BITS - 16){
420
                UPDATE_CACHE(re, &s->gb)
421
            }
422
            {
423
                int cache=GET_CACHE(re,&s->gb);
424
                int sign=(~cache)>>31;
425
                level = (NEG_USR32(sign ^ cache,code) ^ sign) - sign;
426
            }
427

    
428
            LAST_SKIP_BITS(re, &s->gb, code)
429

    
430
            if (i >= 63) {
431
                if(i == 63){
432
                    j = s->scantable.permutated[63];
433
                    block[j] = level * quant_matrix[j];
434
                    break;
435
                }
436
                av_log(s->avctx, AV_LOG_ERROR, "error count: %d\n", i);
437
                return -1;
438
            }
439
            j = s->scantable.permutated[i];
440
            block[j] = level * quant_matrix[j];
441
        }
442
    }
443
    CLOSE_READER(re, &s->gb)}
444

    
445
    return 0;
446
}
447

    
448
static int decode_dc_progressive(MJpegDecodeContext *s, DCTELEM *block, int component,
449
                                 int dc_index, int16_t *quant_matrix, int Al)
450
{
451
    int val;
452
    s->dsp.clear_block(block);
453
    val = mjpeg_decode_dc(s, dc_index);
454
    if (val == 0xffff) {
455
        av_log(s->avctx, AV_LOG_ERROR, "error dc\n");
456
        return -1;
457
    }
458
    val = (val * quant_matrix[0] << Al) + s->last_dc[component];
459
    s->last_dc[component] = val;
460
    block[0] = val;
461
    return 0;
462
}
463

    
464
/* decode block and dequantize - progressive JPEG version */
465
static int decode_block_progressive(MJpegDecodeContext *s, DCTELEM *block, uint8_t *last_nnz,
466
                                    int ac_index, int16_t *quant_matrix,
467
                                    int ss, int se, int Al, int *EOBRUN)
468
{
469
    int code, i, j, level, val, run;
470

    
471
    if(*EOBRUN){
472
        (*EOBRUN)--;
473
        return 0;
474
    }
475
    {OPEN_READER(re, &s->gb)
476
    for(i=ss;;i++) {
477
        UPDATE_CACHE(re, &s->gb);
478
        GET_VLC(code, re, &s->gb, s->vlcs[1][ac_index].table, 9, 2)
479
        /* Progressive JPEG use AC coeffs from zero and this decoder sets offset 16 by default */
480
        code -= 16;
481
        if(code & 0xF) {
482
            i += ((unsigned) code) >> 4;
483
            code &= 0xf;
484
            if(code > MIN_CACHE_BITS - 16){
485
                UPDATE_CACHE(re, &s->gb)
486
            }
487
            {
488
                int cache=GET_CACHE(re,&s->gb);
489
                int sign=(~cache)>>31;
490
                level = (NEG_USR32(sign ^ cache,code) ^ sign) - sign;
491
            }
492

    
493
            LAST_SKIP_BITS(re, &s->gb, code)
494

    
495
            if (i >= se) {
496
                if(i == se){
497
                    j = s->scantable.permutated[se];
498
                    block[j] = level * quant_matrix[j] << Al;
499
                    break;
500
                }
501
                av_log(s->avctx, AV_LOG_ERROR, "error count: %d\n", i);
502
                return -1;
503
            }
504
            j = s->scantable.permutated[i];
505
            block[j] = level * quant_matrix[j] << Al;
506
        }else{
507
            run = ((unsigned) code) >> 4;
508
            if(run == 0xF){// ZRL - skip 15 coefficients
509
                i += 15;
510
            }else{
511
                val = run;
512
                run = (1 << run);
513
                UPDATE_CACHE(re, &s->gb);
514
                run += (GET_CACHE(re, &s->gb) >> (32 - val)) & (run - 1);
515
                if(val)
516
                    LAST_SKIP_BITS(re, &s->gb, val);
517
                *EOBRUN = run - 1;
518
                break;
519
            }
520
        }
521
    }
522
    CLOSE_READER(re, &s->gb)}
523
    if(i > *last_nnz)
524
        *last_nnz = i;
525
    return 0;
526
}
527

    
528
#define REFINE_BIT(j) {\
529
    UPDATE_CACHE(re, &s->gb);\
530
    sign = block[j]>>15;\
531
    block[j] += SHOW_UBITS(re, &s->gb, 1) * ((quant_matrix[j]^sign)-sign) << Al;\
532
    LAST_SKIP_BITS(re, &s->gb, 1);\
533
}
534

    
535
#define ZERO_RUN \
536
for(;;i++) {\
537
    if(i > last) {\
538
        i += run;\
539
        if(i > se) {\
540
            av_log(s->avctx, AV_LOG_ERROR, "error count: %d\n", i);\
541
            return -1;\
542
        }\
543
        break;\
544
    }\
545
    j = s->scantable.permutated[i];\
546
    if(block[j])\
547
        REFINE_BIT(j)\
548
    else if(run-- == 0)\
549
        break;\
550
}
551

    
552
/* decode block and dequantize - progressive JPEG refinement pass */
553
static int decode_block_refinement(MJpegDecodeContext *s, DCTELEM *block, uint8_t *last_nnz,
554
                        int ac_index, int16_t *quant_matrix,
555
                        int ss, int se, int Al, int *EOBRUN)
556
{
557
    int code, i=ss, j, sign, val, run;
558
    int last = FFMIN(se, *last_nnz);
559

    
560
    OPEN_READER(re, &s->gb);
561
    if(*EOBRUN)
562
        (*EOBRUN)--;
563
    else {
564
        for(;;i++) {
565
            UPDATE_CACHE(re, &s->gb);
566
            GET_VLC(code, re, &s->gb, s->vlcs[1][ac_index].table, 9, 2)
567
            /* Progressive JPEG use AC coeffs from zero and this decoder sets offset 16 by default */
568
            code -= 16;
569
            if(code & 0xF) {
570
                run = ((unsigned) code) >> 4;
571
                UPDATE_CACHE(re, &s->gb);
572
                val = SHOW_UBITS(re, &s->gb, 1);
573
                LAST_SKIP_BITS(re, &s->gb, 1);
574
                ZERO_RUN;
575
                j = s->scantable.permutated[i];
576
                val--;
577
                block[j] = ((quant_matrix[j]^val)-val) << Al;
578
                if(i == se) {
579
                    if(i > *last_nnz)
580
                        *last_nnz = i;
581
                    CLOSE_READER(re, &s->gb)
582
                    return 0;
583
                }
584
            }else{
585
                run = ((unsigned) code) >> 4;
586
                if(run == 0xF){
587
                    ZERO_RUN;
588
                }else{
589
                    val = run;
590
                    run = (1 << run);
591
                    if(val) {
592
                        UPDATE_CACHE(re, &s->gb);
593
                        run += SHOW_UBITS(re, &s->gb, val);
594
                        LAST_SKIP_BITS(re, &s->gb, val);
595
                    }
596
                    *EOBRUN = run - 1;
597
                    break;
598
                }
599
            }
600
        }
601

    
602
        if(i > *last_nnz)
603
            *last_nnz = i;
604
    }
605

    
606
    for(;i<=last;i++) {
607
        j = s->scantable.permutated[i];
608
        if(block[j])
609
            REFINE_BIT(j)
610
    }
611
    CLOSE_READER(re, &s->gb);
612

    
613
    return 0;
614
}
615
#undef REFINE_BIT
616
#undef ZERO_RUN
617

    
618
static int ljpeg_decode_rgb_scan(MJpegDecodeContext *s, int predictor, int point_transform){
619
    int i, mb_x, mb_y;
620
    uint16_t (*buffer)[4];
621
    int left[3], top[3], topleft[3];
622
    const int linesize= s->linesize[0];
623
    const int mask= (1<<s->bits)-1;
624

    
625
    av_fast_malloc(&s->ljpeg_buffer, &s->ljpeg_buffer_size, (unsigned)s->mb_width * 4 * sizeof(s->ljpeg_buffer[0][0]));
626
    buffer= s->ljpeg_buffer;
627

    
628
    for(i=0; i<3; i++){
629
        buffer[0][i]= 1 << (s->bits + point_transform - 1);
630
    }
631
    for(mb_y = 0; mb_y < s->mb_height; mb_y++) {
632
        const int modified_predictor= mb_y ? predictor : 1;
633
        uint8_t *ptr = s->picture.data[0] + (linesize * mb_y);
634

    
635
        if (s->interlaced && s->bottom_field)
636
            ptr += linesize >> 1;
637

    
638
        for(i=0; i<3; i++){
639
            top[i]= left[i]= topleft[i]= buffer[0][i];
640
        }
641
        for(mb_x = 0; mb_x < s->mb_width; mb_x++) {
642
            if (s->restart_interval && !s->restart_count)
643
                s->restart_count = s->restart_interval;
644

    
645
            for(i=0;i<3;i++) {
646
                int pred;
647

    
648
                topleft[i]= top[i];
649
                top[i]= buffer[mb_x][i];
650

    
651
                PREDICT(pred, topleft[i], top[i], left[i], modified_predictor);
652

    
653
                left[i]=
654
                buffer[mb_x][i]= mask & (pred + (mjpeg_decode_dc(s, s->dc_index[i]) << point_transform));
655
            }
656

    
657
            if (s->restart_interval && !--s->restart_count) {
658
                align_get_bits(&s->gb);
659
                skip_bits(&s->gb, 16); /* skip RSTn */
660
            }
661
        }
662

    
663
        if(s->rct){
664
            for(mb_x = 0; mb_x < s->mb_width; mb_x++) {
665
                ptr[4*mb_x+1] = buffer[mb_x][0] - ((buffer[mb_x][1] + buffer[mb_x][2] - 0x200)>>2);
666
                ptr[4*mb_x+0] = buffer[mb_x][1] + ptr[4*mb_x+1];
667
                ptr[4*mb_x+2] = buffer[mb_x][2] + ptr[4*mb_x+1];
668
            }
669
        }else if(s->pegasus_rct){
670
            for(mb_x = 0; mb_x < s->mb_width; mb_x++) {
671
                ptr[4*mb_x+1] = buffer[mb_x][0] - ((buffer[mb_x][1] + buffer[mb_x][2])>>2);
672
                ptr[4*mb_x+0] = buffer[mb_x][1] + ptr[4*mb_x+1];
673
                ptr[4*mb_x+2] = buffer[mb_x][2] + ptr[4*mb_x+1];
674
            }
675
        }else{
676
            for(mb_x = 0; mb_x < s->mb_width; mb_x++) {
677
                ptr[4*mb_x+0] = buffer[mb_x][2];
678
                ptr[4*mb_x+1] = buffer[mb_x][1];
679
                ptr[4*mb_x+2] = buffer[mb_x][0];
680
            }
681
        }
682
    }
683
    return 0;
684
}
685

    
686
static int ljpeg_decode_yuv_scan(MJpegDecodeContext *s, int predictor, int point_transform){
687
    int i, mb_x, mb_y;
688
    const int nb_components=3;
689

    
690
    for(mb_y = 0; mb_y < s->mb_height; mb_y++) {
691
        for(mb_x = 0; mb_x < s->mb_width; mb_x++) {
692
            if (s->restart_interval && !s->restart_count)
693
                s->restart_count = s->restart_interval;
694

    
695
            if(mb_x==0 || mb_y==0 || s->interlaced){
696
                for(i=0;i<nb_components;i++) {
697
                    uint8_t *ptr;
698
                    int n, h, v, x, y, c, j, linesize;
699
                    n = s->nb_blocks[i];
700
                    c = s->comp_index[i];
701
                    h = s->h_scount[i];
702
                    v = s->v_scount[i];
703
                    x = 0;
704
                    y = 0;
705
                    linesize= s->linesize[c];
706

    
707
                    for(j=0; j<n; j++) {
708
                        int pred;
709

    
710
                        ptr = s->picture.data[c] + (linesize * (v * mb_y + y)) + (h * mb_x + x); //FIXME optimize this crap
711
                        if(y==0 && mb_y==0){
712
                            if(x==0 && mb_x==0){
713
                                pred= 128 << point_transform;
714
                            }else{
715
                                pred= ptr[-1];
716
                            }
717
                        }else{
718
                            if(x==0 && mb_x==0){
719
                                pred= ptr[-linesize];
720
                            }else{
721
                                PREDICT(pred, ptr[-linesize-1], ptr[-linesize], ptr[-1], predictor);
722
                            }
723
                        }
724

    
725
                        if (s->interlaced && s->bottom_field)
726
                            ptr += linesize >> 1;
727
                        *ptr= pred + (mjpeg_decode_dc(s, s->dc_index[i]) << point_transform);
728

    
729
                        if (++x == h) {
730
                            x = 0;
731
                            y++;
732
                        }
733
                    }
734
                }
735
            }else{
736
                for(i=0;i<nb_components;i++) {
737
                    uint8_t *ptr;
738
                    int n, h, v, x, y, c, j, linesize;
739
                    n = s->nb_blocks[i];
740
                    c = s->comp_index[i];
741
                    h = s->h_scount[i];
742
                    v = s->v_scount[i];
743
                    x = 0;
744
                    y = 0;
745
                    linesize= s->linesize[c];
746

    
747
                    for(j=0; j<n; j++) {
748
                        int pred;
749

    
750
                        ptr = s->picture.data[c] + (linesize * (v * mb_y + y)) + (h * mb_x + x); //FIXME optimize this crap
751
                        PREDICT(pred, ptr[-linesize-1], ptr[-linesize], ptr[-1], predictor);
752
                        *ptr= pred + (mjpeg_decode_dc(s, s->dc_index[i]) << point_transform);
753
                        if (++x == h) {
754
                            x = 0;
755
                            y++;
756
                        }
757
                    }
758
                }
759
            }
760
            if (s->restart_interval && !--s->restart_count) {
761
                align_get_bits(&s->gb);
762
                skip_bits(&s->gb, 16); /* skip RSTn */
763
            }
764
        }
765
    }
766
    return 0;
767
}
768

    
769
static int mjpeg_decode_scan(MJpegDecodeContext *s, int nb_components, int Ah, int Al){
770
    int i, mb_x, mb_y;
771
    uint8_t* data[MAX_COMPONENTS];
772
    int linesize[MAX_COMPONENTS];
773

    
774
    if(s->flipped && s->avctx->flags & CODEC_FLAG_EMU_EDGE) {
775
        av_log(s->avctx, AV_LOG_ERROR, "Can not flip image with CODEC_FLAG_EMU_EDGE set!\n");
776
        s->flipped = 0;
777
    }
778
    for(i=0; i < nb_components; i++) {
779
        int c = s->comp_index[i];
780
        data[c] = s->picture.data[c];
781
        linesize[c]=s->linesize[c];
782
        s->coefs_finished[c] |= 1;
783
        if(s->flipped) {
784
            //picture should be flipped upside-down for this codec
785
            data[c] += (linesize[c] * (s->v_scount[i] * (8 * s->mb_height -((s->height/s->v_max)&7)) - 1 ));
786
            linesize[c] *= -1;
787
        }
788
    }
789

    
790
    for(mb_y = 0; mb_y < s->mb_height; mb_y++) {
791
        for(mb_x = 0; mb_x < s->mb_width; mb_x++) {
792
            if (s->restart_interval && !s->restart_count)
793
                s->restart_count = s->restart_interval;
794

    
795
            for(i=0;i<nb_components;i++) {
796
                uint8_t *ptr;
797
                int n, h, v, x, y, c, j;
798
                n = s->nb_blocks[i];
799
                c = s->comp_index[i];
800
                h = s->h_scount[i];
801
                v = s->v_scount[i];
802
                x = 0;
803
                y = 0;
804
                for(j=0;j<n;j++) {
805
                    ptr = data[c] +
806
                        (((linesize[c] * (v * mb_y + y) * 8) +
807
                        (h * mb_x + x) * 8) >> s->avctx->lowres);
808
                    if(s->interlaced && s->bottom_field)
809
                        ptr += linesize[c] >> 1;
810
                    if(!s->progressive) {
811
                        s->dsp.clear_block(s->block);
812
                        if(decode_block(s, s->block, i,
813
                                     s->dc_index[i], s->ac_index[i],
814
                                     s->quant_matrixes[ s->quant_index[c] ]) < 0) {
815
                            av_log(s->avctx, AV_LOG_ERROR, "error y=%d x=%d\n", mb_y, mb_x);
816
                            return -1;
817
                        }
818
                        s->dsp.idct_put(ptr, linesize[c], s->block);
819
                    } else {
820
                        int block_idx = s->block_stride[c] * (v * mb_y + y) + (h * mb_x + x);
821
                        DCTELEM *block = s->blocks[c][block_idx];
822
                        if(Ah)
823
                            block[0] += get_bits1(&s->gb) * s->quant_matrixes[ s->quant_index[c] ][0] << Al;
824
                        else if(decode_dc_progressive(s, block, i, s->dc_index[i], s->quant_matrixes[ s->quant_index[c] ], Al) < 0) {
825
                            av_log(s->avctx, AV_LOG_ERROR, "error y=%d x=%d\n", mb_y, mb_x);
826
                            return -1;
827
                        }
828
                    }
829
//                    av_log(s->avctx, AV_LOG_DEBUG, "mb: %d %d processed\n", mb_y, mb_x);
830
//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);
831
                    if (++x == h) {
832
                        x = 0;
833
                        y++;
834
                    }
835
                }
836
            }
837

    
838
            if (s->restart_interval && !--s->restart_count) {
839
                align_get_bits(&s->gb);
840
                skip_bits(&s->gb, 16); /* skip RSTn */
841
                for (i=0; i<nb_components; i++) /* reset dc */
842
                    s->last_dc[i] = 1024;
843
            }
844
        }
845
    }
846
    return 0;
847
}
848

    
849
static int mjpeg_decode_scan_progressive_ac(MJpegDecodeContext *s, int ss, int se, int Ah, int Al){
850
    int mb_x, mb_y;
851
    int EOBRUN = 0;
852
    int c = s->comp_index[0];
853
    uint8_t* data = s->picture.data[c];
854
    int linesize = s->linesize[c];
855
    int last_scan = 0;
856
    int16_t *quant_matrix = s->quant_matrixes[ s->quant_index[c] ];
857

    
858
    if(!Al) {
859
        s->coefs_finished[c] |= (1LL<<(se+1))-(1LL<<ss);
860
        last_scan = !~s->coefs_finished[c];
861
    }
862

    
863
    if(s->interlaced && s->bottom_field)
864
        data += linesize >> 1;
865

    
866
    for(mb_y = 0; mb_y < s->mb_height; mb_y++) {
867
        uint8_t *ptr = data + (mb_y*linesize*8 >> s->avctx->lowres);
868
        int block_idx = mb_y * s->block_stride[c];
869
        DCTELEM (*block)[64] = &s->blocks[c][block_idx];
870
        uint8_t *last_nnz = &s->last_nnz[c][block_idx];
871
        for(mb_x = 0; mb_x < s->mb_width; mb_x++, block++, last_nnz++) {
872
            int ret;
873
            if(Ah)
874
                ret = decode_block_refinement(s, *block, last_nnz, s->ac_index[0],
875
                                              quant_matrix, ss, se, Al, &EOBRUN);
876
            else
877
                ret = decode_block_progressive(s, *block, last_nnz, s->ac_index[0],
878
                                               quant_matrix, ss, se, Al, &EOBRUN);
879
            if(ret < 0) {
880
                av_log(s->avctx, AV_LOG_ERROR, "error y=%d x=%d\n", mb_y, mb_x);
881
                return -1;
882
            }
883
            if(last_scan) {
884
                s->dsp.idct_put(ptr, linesize, *block);
885
                ptr += 8 >> s->avctx->lowres;
886
            }
887
        }
888
    }
889
    return 0;
890
}
891

    
892
int ff_mjpeg_decode_sos(MJpegDecodeContext *s)
893
{
894
    int len, nb_components, i, h, v, predictor, point_transform;
895
    int index, id;
896
    const int block_size= s->lossless ? 1 : 8;
897
    int ilv, prev_shift;
898

    
899
    /* XXX: verify len field validity */
900
    len = get_bits(&s->gb, 16);
901
    nb_components = get_bits(&s->gb, 8);
902
    if (nb_components == 0 || nb_components > MAX_COMPONENTS){
903
        av_log(s->avctx, AV_LOG_ERROR, "decode_sos: nb_components (%d) unsupported\n", nb_components);
904
        return -1;
905
    }
906
    if (len != 6+2*nb_components)
907
    {
908
        av_log(s->avctx, AV_LOG_ERROR, "decode_sos: invalid len (%d)\n", len);
909
        return -1;
910
    }
911
    for(i=0;i<nb_components;i++) {
912
        id = get_bits(&s->gb, 8) - 1;
913
        av_log(s->avctx, AV_LOG_DEBUG, "component: %d\n", id);
914
        /* find component index */
915
        for(index=0;index<s->nb_components;index++)
916
            if (id == s->component_id[index])
917
                break;
918
        if (index == s->nb_components)
919
        {
920
            av_log(s->avctx, AV_LOG_ERROR, "decode_sos: index(%d) out of components\n", index);
921
            return -1;
922
        }
923
        /* Metasoft MJPEG codec has Cb and Cr swapped */
924
        if (s->avctx->codec_tag == MKTAG('M', 'T', 'S', 'J')
925
            && nb_components == 3 && s->nb_components == 3 && i)
926
            index = 3 - i;
927

    
928
        s->comp_index[i] = index;
929

    
930
        s->nb_blocks[i] = s->h_count[index] * s->v_count[index];
931
        s->h_scount[i] = s->h_count[index];
932
        s->v_scount[i] = s->v_count[index];
933

    
934
        s->dc_index[i] = get_bits(&s->gb, 4);
935
        s->ac_index[i] = get_bits(&s->gb, 4);
936

    
937
        if (s->dc_index[i] <  0 || s->ac_index[i] < 0 ||
938
            s->dc_index[i] >= 4 || s->ac_index[i] >= 4)
939
            goto out_of_range;
940
        if (!s->vlcs[0][s->dc_index[i]].table || !s->vlcs[1][s->ac_index[i]].table)
941
            goto out_of_range;
942
    }
943

    
944
    predictor= get_bits(&s->gb, 8); /* JPEG Ss / lossless JPEG predictor /JPEG-LS NEAR */
945
    ilv= get_bits(&s->gb, 8);    /* JPEG Se / JPEG-LS ILV */
946
    prev_shift = get_bits(&s->gb, 4); /* Ah */
947
    point_transform= get_bits(&s->gb, 4); /* Al */
948

    
949
    for(i=0;i<nb_components;i++)
950
        s->last_dc[i] = 1024;
951

    
952
    if (nb_components > 1) {
953
        /* interleaved stream */
954
        s->mb_width  = (s->width  + s->h_max * block_size - 1) / (s->h_max * block_size);
955
        s->mb_height = (s->height + s->v_max * block_size - 1) / (s->v_max * block_size);
956
    } else if(!s->ls) { /* skip this for JPEG-LS */
957
        h = s->h_max / s->h_scount[0];
958
        v = s->v_max / s->v_scount[0];
959
        s->mb_width  = (s->width  + h * block_size - 1) / (h * block_size);
960
        s->mb_height = (s->height + v * block_size - 1) / (v * block_size);
961
        s->nb_blocks[0] = 1;
962
        s->h_scount[0] = 1;
963
        s->v_scount[0] = 1;
964
    }
965

    
966
    if(s->avctx->debug & FF_DEBUG_PICT_INFO)
967
        av_log(s->avctx, AV_LOG_DEBUG, "%s %s p:%d >>:%d ilv:%d bits:%d %s\n", s->lossless ? "lossless" : "sequential DCT", s->rgb ? "RGB" : "",
968
               predictor, point_transform, ilv, s->bits,
969
               s->pegasus_rct ? "PRCT" : (s->rct ? "RCT" : ""));
970

    
971

    
972
    /* mjpeg-b can have padding bytes between sos and image data, skip them */
973
    for (i = s->mjpb_skiptosod; i > 0; i--)
974
        skip_bits(&s->gb, 8);
975

    
976
    if(s->lossless){
977
        if(CONFIG_JPEGLS_DECODER && s->ls){
978
//            for(){
979
//            reset_ls_coding_parameters(s, 0);
980

    
981
            if(ff_jpegls_decode_picture(s, predictor, point_transform, ilv) < 0)
982
                return -1;
983
        }else{
984
            if(s->rgb){
985
                if(ljpeg_decode_rgb_scan(s, predictor, point_transform) < 0)
986
                    return -1;
987
            }else{
988
                if(ljpeg_decode_yuv_scan(s, predictor, point_transform) < 0)
989
                    return -1;
990
            }
991
        }
992
    }else{
993
        if(s->progressive && predictor) {
994
            if(mjpeg_decode_scan_progressive_ac(s, predictor, ilv, prev_shift, point_transform) < 0)
995
                return -1;
996
        } else {
997
            if(mjpeg_decode_scan(s, nb_components, prev_shift, point_transform) < 0)
998
                return -1;
999
        }
1000
    }
1001
    emms_c();
1002
    return 0;
1003
 out_of_range:
1004
    av_log(s->avctx, AV_LOG_ERROR, "decode_sos: ac/dc index out of range\n");
1005
    return -1;
1006
}
1007

    
1008
static int mjpeg_decode_dri(MJpegDecodeContext *s)
1009
{
1010
    if (get_bits(&s->gb, 16) != 4)
1011
        return -1;
1012
    s->restart_interval = get_bits(&s->gb, 16);
1013
    s->restart_count = 0;
1014
    av_log(s->avctx, AV_LOG_DEBUG, "restart interval: %d\n", s->restart_interval);
1015

    
1016
    return 0;
1017
}
1018

    
1019
static int mjpeg_decode_app(MJpegDecodeContext *s)
1020
{
1021
    int len, id, i;
1022

    
1023
    len = get_bits(&s->gb, 16);
1024
    if (len < 5)
1025
        return -1;
1026
    if(8*len + get_bits_count(&s->gb) > s->gb.size_in_bits)
1027
        return -1;
1028

    
1029
    id = (get_bits(&s->gb, 16) << 16) | get_bits(&s->gb, 16);
1030
    id = be2me_32(id);
1031
    len -= 6;
1032

    
1033
    if(s->avctx->debug & FF_DEBUG_STARTCODE){
1034
        av_log(s->avctx, AV_LOG_DEBUG, "APPx %8X\n", id);
1035
    }
1036

    
1037
    /* buggy AVID, it puts EOI only at every 10th frame */
1038
    /* also this fourcc is used by non-avid files too, it holds some
1039
       informations, but it's always present in AVID creates files */
1040
    if (id == AV_RL32("AVI1"))
1041
    {
1042
        /* structure:
1043
            4bytes      AVI1
1044
            1bytes      polarity
1045
            1bytes      always zero
1046
            4bytes      field_size
1047
            4bytes      field_size_less_padding
1048
        */
1049
            s->buggy_avid = 1;
1050
//        if (s->first_picture)
1051
//            printf("mjpeg: workarounding buggy AVID\n");
1052
        i = get_bits(&s->gb, 8);
1053
        if     (i==2) s->bottom_field= 1;
1054
        else if(i==1) s->bottom_field= 0;
1055
#if 0
1056
        skip_bits(&s->gb, 8);
1057
        skip_bits(&s->gb, 32);
1058
        skip_bits(&s->gb, 32);
1059
        len -= 10;
1060
#endif
1061
//        if (s->interlace_polarity)
1062
//            printf("mjpeg: interlace polarity: %d\n", s->interlace_polarity);
1063
        goto out;
1064
    }
1065

    
1066
//    len -= 2;
1067

    
1068
    if (id == AV_RL32("JFIF"))
1069
    {
1070
        int t_w, t_h, v1, v2;
1071
        skip_bits(&s->gb, 8); /* the trailing zero-byte */
1072
        v1= get_bits(&s->gb, 8);
1073
        v2= get_bits(&s->gb, 8);
1074
        skip_bits(&s->gb, 8);
1075

    
1076
        s->avctx->sample_aspect_ratio.num= get_bits(&s->gb, 16);
1077
        s->avctx->sample_aspect_ratio.den= get_bits(&s->gb, 16);
1078

    
1079
        if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1080
            av_log(s->avctx, AV_LOG_INFO, "mjpeg: JFIF header found (version: %x.%x) SAR=%d/%d\n",
1081
                v1, v2,
1082
                s->avctx->sample_aspect_ratio.num,
1083
                s->avctx->sample_aspect_ratio.den
1084
            );
1085

    
1086
        t_w = get_bits(&s->gb, 8);
1087
        t_h = get_bits(&s->gb, 8);
1088
        if (t_w && t_h)
1089
        {
1090
            /* skip thumbnail */
1091
            if (len-10-(t_w*t_h*3) > 0)
1092
                len -= t_w*t_h*3;
1093
        }
1094
        len -= 10;
1095
        goto out;
1096
    }
1097

    
1098
    if (id == AV_RL32("Adob") && (get_bits(&s->gb, 8) == 'e'))
1099
    {
1100
        if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1101
            av_log(s->avctx, AV_LOG_INFO, "mjpeg: Adobe header found\n");
1102
        skip_bits(&s->gb, 16); /* version */
1103
        skip_bits(&s->gb, 16); /* flags0 */
1104
        skip_bits(&s->gb, 16); /* flags1 */
1105
        skip_bits(&s->gb, 8);  /* transform */
1106
        len -= 7;
1107
        goto out;
1108
    }
1109

    
1110
    if (id == AV_RL32("LJIF")){
1111
        if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1112
            av_log(s->avctx, AV_LOG_INFO, "Pegasus lossless jpeg header found\n");
1113
        skip_bits(&s->gb, 16); /* version ? */
1114
        skip_bits(&s->gb, 16); /* unknwon always 0? */
1115
        skip_bits(&s->gb, 16); /* unknwon always 0? */
1116
        skip_bits(&s->gb, 16); /* unknwon always 0? */
1117
        switch( get_bits(&s->gb, 8)){
1118
        case 1:
1119
            s->rgb= 1;
1120
            s->pegasus_rct=0;
1121
            break;
1122
        case 2:
1123
            s->rgb= 1;
1124
            s->pegasus_rct=1;
1125
            break;
1126
        default:
1127
            av_log(s->avctx, AV_LOG_ERROR, "unknown colorspace\n");
1128
        }
1129
        len -= 9;
1130
        goto out;
1131
    }
1132

    
1133
    /* Apple MJPEG-A */
1134
    if ((s->start_code == APP1) && (len > (0x28 - 8)))
1135
    {
1136
        id = (get_bits(&s->gb, 16) << 16) | get_bits(&s->gb, 16);
1137
        id = be2me_32(id);
1138
        len -= 4;
1139
        if (id == AV_RL32("mjpg")) /* Apple MJPEG-A */
1140
        {
1141
#if 0
1142
            skip_bits(&s->gb, 32); /* field size */
1143
            skip_bits(&s->gb, 32); /* pad field size */
1144
            skip_bits(&s->gb, 32); /* next off */
1145
            skip_bits(&s->gb, 32); /* quant off */
1146
            skip_bits(&s->gb, 32); /* huff off */
1147
            skip_bits(&s->gb, 32); /* image off */
1148
            skip_bits(&s->gb, 32); /* scan off */
1149
            skip_bits(&s->gb, 32); /* data off */
1150
#endif
1151
            if (s->avctx->debug & FF_DEBUG_PICT_INFO)
1152
                av_log(s->avctx, AV_LOG_INFO, "mjpeg: Apple MJPEG-A header found\n");
1153
        }
1154
    }
1155

    
1156
out:
1157
    /* slow but needed for extreme adobe jpegs */
1158
    if (len < 0)
1159
        av_log(s->avctx, AV_LOG_ERROR, "mjpeg: error, decode_app parser read over the end\n");
1160
    while(--len > 0)
1161
        skip_bits(&s->gb, 8);
1162

    
1163
    return 0;
1164
}
1165

    
1166
static int mjpeg_decode_com(MJpegDecodeContext *s)
1167
{
1168
    int len = get_bits(&s->gb, 16);
1169
    if (len >= 2 && 8*len - 16 + get_bits_count(&s->gb) <= s->gb.size_in_bits) {
1170
        char *cbuf = av_malloc(len - 1);
1171
        if (cbuf) {
1172
            int i;
1173
            for (i = 0; i < len - 2; i++)
1174
                cbuf[i] = get_bits(&s->gb, 8);
1175
            if (i > 0 && cbuf[i-1] == '\n')
1176
                cbuf[i-1] = 0;
1177
            else
1178
                cbuf[i] = 0;
1179

    
1180
            if(s->avctx->debug & FF_DEBUG_PICT_INFO)
1181
                av_log(s->avctx, AV_LOG_INFO, "mjpeg comment: '%s'\n", cbuf);
1182

    
1183
            /* buggy avid, it puts EOI only at every 10th frame */
1184
            if (!strcmp(cbuf, "AVID"))
1185
            {
1186
                s->buggy_avid = 1;
1187
                //        if (s->first_picture)
1188
                //            printf("mjpeg: workarounding buggy AVID\n");
1189
            }
1190
            else if(!strcmp(cbuf, "CS=ITU601")){
1191
                s->cs_itu601= 1;
1192
            }
1193
            else if((len > 20 && !strncmp(cbuf, "Intel(R) JPEG Library", 21)) ||
1194
                    (len > 19 && !strncmp(cbuf, "Metasoft MJPEG Codec", 20))){
1195
                s->flipped = 1;
1196
            }
1197

    
1198
            av_free(cbuf);
1199
        }
1200
    }
1201

    
1202
    return 0;
1203
}
1204

    
1205
#if 0
1206
static int valid_marker_list[] =
1207
{
1208
        /* 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, a, b, c, d, e, f */
1209
/* 0 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
1210
/* 1 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
1211
/* 2 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
1212
/* 3 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
1213
/* 4 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
1214
/* 5 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
1215
/* 6 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
1216
/* 7 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
1217
/* 8 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
1218
/* 9 */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
1219
/* a */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
1220
/* b */    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
1221
/* c */    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1222
/* d */    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1223
/* e */    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1224
/* f */    1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0,
1225
}
1226
#endif
1227

    
1228
/* return the 8 bit start code value and update the search
1229
   state. Return -1 if no start code found */
1230
static int find_marker(const uint8_t **pbuf_ptr, const uint8_t *buf_end)
1231
{
1232
    const uint8_t *buf_ptr;
1233
    unsigned int v, v2;
1234
    int val;
1235
#ifdef DEBUG
1236
    int skipped=0;
1237
#endif
1238

    
1239
    buf_ptr = *pbuf_ptr;
1240
    while (buf_ptr < buf_end) {
1241
        v = *buf_ptr++;
1242
        v2 = *buf_ptr;
1243
        if ((v == 0xff) && (v2 >= 0xc0) && (v2 <= 0xfe) && buf_ptr < buf_end) {
1244
            val = *buf_ptr++;
1245
            goto found;
1246
        }
1247
#ifdef DEBUG
1248
        skipped++;
1249
#endif
1250
    }
1251
    val = -1;
1252
found:
1253
    dprintf(NULL, "find_marker skipped %d bytes\n", skipped);
1254
    *pbuf_ptr = buf_ptr;
1255
    return val;
1256
}
1257

    
1258
int ff_mjpeg_decode_frame(AVCodecContext *avctx,
1259
                              void *data, int *data_size,
1260
                              AVPacket *avpkt)
1261
{
1262
    const uint8_t *buf = avpkt->data;
1263
    int buf_size = avpkt->size;
1264
    MJpegDecodeContext *s = avctx->priv_data;
1265
    const uint8_t *buf_end, *buf_ptr;
1266
    int start_code;
1267
    AVFrame *picture = data;
1268

    
1269
    s->got_picture = 0; // picture from previous image can not be reused
1270
    buf_ptr = buf;
1271
    buf_end = buf + buf_size;
1272
    while (buf_ptr < buf_end) {
1273
        /* find start next marker */
1274
        start_code = find_marker(&buf_ptr, buf_end);
1275
        {
1276
            /* EOF */
1277
            if (start_code < 0) {
1278
                goto the_end;
1279
            } else {
1280
                av_log(avctx, AV_LOG_DEBUG, "marker=%x avail_size_in_buf=%td\n", start_code, buf_end - buf_ptr);
1281

    
1282
                if ((buf_end - buf_ptr) > s->buffer_size)
1283
                {
1284
                    av_free(s->buffer);
1285
                    s->buffer_size = buf_end-buf_ptr;
1286
                    s->buffer = av_malloc(s->buffer_size + FF_INPUT_BUFFER_PADDING_SIZE);
1287
                    av_log(avctx, AV_LOG_DEBUG, "buffer too small, expanding to %d bytes\n",
1288
                        s->buffer_size);
1289
                }
1290

    
1291
                /* unescape buffer of SOS, use special treatment for JPEG-LS */
1292
                if (start_code == SOS && !s->ls)
1293
                {
1294
                    const uint8_t *src = buf_ptr;
1295
                    uint8_t *dst = s->buffer;
1296

    
1297
                    while (src<buf_end)
1298
                    {
1299
                        uint8_t x = *(src++);
1300

    
1301
                        *(dst++) = x;
1302
                        if (avctx->codec_id != CODEC_ID_THP)
1303
                        {
1304
                            if (x == 0xff) {
1305
                                while (src < buf_end && x == 0xff)
1306
                                    x = *(src++);
1307

    
1308
                                if (x >= 0xd0 && x <= 0xd7)
1309
                                    *(dst++) = x;
1310
                                else if (x)
1311
                                    break;
1312
                            }
1313
                        }
1314
                    }
1315
                    init_get_bits(&s->gb, s->buffer, (dst - s->buffer)*8);
1316

    
1317
                    av_log(avctx, AV_LOG_DEBUG, "escaping removed %td bytes\n",
1318
                           (buf_end - buf_ptr) - (dst - s->buffer));
1319
                }
1320
                else if(start_code == SOS && s->ls){
1321
                    const uint8_t *src = buf_ptr;
1322
                    uint8_t *dst = s->buffer;
1323
                    int bit_count = 0;
1324
                    int t = 0, b = 0;
1325
                    PutBitContext pb;
1326

    
1327
                    s->cur_scan++;
1328

    
1329
                    /* find marker */
1330
                    while (src + t < buf_end){
1331
                        uint8_t x = src[t++];
1332
                        if (x == 0xff){
1333
                            while((src + t < buf_end) && x == 0xff)
1334
                                x = src[t++];
1335
                            if (x & 0x80) {
1336
                                t -= 2;
1337
                                break;
1338
                            }
1339
                        }
1340
                    }
1341
                    bit_count = t * 8;
1342

    
1343
                    init_put_bits(&pb, dst, t);
1344

    
1345
                    /* unescape bitstream */
1346
                    while(b < t){
1347
                        uint8_t x = src[b++];
1348
                        put_bits(&pb, 8, x);
1349
                        if(x == 0xFF){
1350
                            x = src[b++];
1351
                            put_bits(&pb, 7, x);
1352
                            bit_count--;
1353
                        }
1354
                    }
1355
                    flush_put_bits(&pb);
1356

    
1357
                    init_get_bits(&s->gb, dst, bit_count);
1358
                }
1359
                else
1360
                    init_get_bits(&s->gb, buf_ptr, (buf_end - buf_ptr)*8);
1361

    
1362
                s->start_code = start_code;
1363
                if(s->avctx->debug & FF_DEBUG_STARTCODE){
1364
                    av_log(avctx, AV_LOG_DEBUG, "startcode: %X\n", start_code);
1365
                }
1366

    
1367
                /* process markers */
1368
                if (start_code >= 0xd0 && start_code <= 0xd7) {
1369
                    av_log(avctx, AV_LOG_DEBUG, "restart marker: %d\n", start_code&0x0f);
1370
                    /* APP fields */
1371
                } else if (start_code >= APP0 && start_code <= APP15) {
1372
                    mjpeg_decode_app(s);
1373
                    /* Comment */
1374
                } else if (start_code == COM){
1375
                    mjpeg_decode_com(s);
1376
                }
1377

    
1378
                switch(start_code) {
1379
                case SOI:
1380
                    s->restart_interval = 0;
1381

    
1382
                    s->restart_count = 0;
1383
                    /* nothing to do on SOI */
1384
                    break;
1385
                case DQT:
1386
                    ff_mjpeg_decode_dqt(s);
1387
                    break;
1388
                case DHT:
1389
                    if(ff_mjpeg_decode_dht(s) < 0){
1390
                        av_log(avctx, AV_LOG_ERROR, "huffman table decode error\n");
1391
                        return -1;
1392
                    }
1393
                    break;
1394
                case SOF0:
1395
                case SOF1:
1396
                    s->lossless=0;
1397
                    s->ls=0;
1398
                    s->progressive=0;
1399
                    if (ff_mjpeg_decode_sof(s) < 0)
1400
                        return -1;
1401
                    break;
1402
                case SOF2:
1403
                    s->lossless=0;
1404
                    s->ls=0;
1405
                    s->progressive=1;
1406
                    if (ff_mjpeg_decode_sof(s) < 0)
1407
                        return -1;
1408
                    break;
1409
                case SOF3:
1410
                    s->lossless=1;
1411
                    s->ls=0;
1412
                    s->progressive=0;
1413
                    if (ff_mjpeg_decode_sof(s) < 0)
1414
                        return -1;
1415
                    break;
1416
                case SOF48:
1417
                    s->lossless=1;
1418
                    s->ls=1;
1419
                    s->progressive=0;
1420
                    if (ff_mjpeg_decode_sof(s) < 0)
1421
                        return -1;
1422
                    break;
1423
                case LSE:
1424
                    if (!CONFIG_JPEGLS_DECODER || ff_jpegls_decode_lse(s) < 0)
1425
                        return -1;
1426
                    break;
1427
                case EOI:
1428
                    s->cur_scan = 0;
1429
                    if ((s->buggy_avid && !s->interlaced) || s->restart_interval)
1430
                        break;
1431
eoi_parser:
1432
                    if (!s->got_picture) {
1433
                        av_log(avctx, AV_LOG_WARNING, "Found EOI before any SOF, ignoring\n");
1434
                        break;
1435
                    }
1436
                    {
1437
                        if (s->interlaced) {
1438
                            s->bottom_field ^= 1;
1439
                            /* if not bottom field, do not output image yet */
1440
                            if (s->bottom_field == !s->interlace_polarity)
1441
                                goto not_the_end;
1442
                        }
1443
                        *picture = s->picture;
1444
                        *data_size = sizeof(AVFrame);
1445

    
1446
                        if(!s->lossless){
1447
                            picture->quality= FFMAX3(s->qscale[0], s->qscale[1], s->qscale[2]);
1448
                            picture->qstride= 0;
1449
                            picture->qscale_table= s->qscale_table;
1450
                            memset(picture->qscale_table, picture->quality, (s->width+15)/16);
1451
                            if(avctx->debug & FF_DEBUG_QP)
1452
                                av_log(avctx, AV_LOG_DEBUG, "QP: %d\n", picture->quality);
1453
                            picture->quality*= FF_QP2LAMBDA;
1454
                        }
1455

    
1456
                        goto the_end;
1457
                    }
1458
                    break;
1459
                case SOS:
1460
                    if (!s->got_picture) {
1461
                        av_log(avctx, AV_LOG_WARNING, "Can not process SOS before SOF, skipping\n");
1462
                        break;
1463
                    }
1464
                    ff_mjpeg_decode_sos(s);
1465
                    /* buggy avid puts EOI every 10-20th frame */
1466
                    /* if restart period is over process EOI */
1467
                    if ((s->buggy_avid && !s->interlaced) || s->restart_interval)
1468
                        goto eoi_parser;
1469
                    break;
1470
                case DRI:
1471
                    mjpeg_decode_dri(s);
1472
                    break;
1473
                case SOF5:
1474
                case SOF6:
1475
                case SOF7:
1476
                case SOF9:
1477
                case SOF10:
1478
                case SOF11:
1479
                case SOF13:
1480
                case SOF14:
1481
                case SOF15:
1482
                case JPG:
1483
                    av_log(avctx, AV_LOG_ERROR, "mjpeg: unsupported coding type (%x)\n", start_code);
1484
                    break;
1485
//                default:
1486
//                    printf("mjpeg: unsupported marker (%x)\n", start_code);
1487
//                    break;
1488
                }
1489

    
1490
not_the_end:
1491
                /* eof process start code */
1492
                buf_ptr += (get_bits_count(&s->gb)+7)/8;
1493
                av_log(avctx, AV_LOG_DEBUG, "marker parser used %d bytes (%d bits)\n",
1494
                       (get_bits_count(&s->gb)+7)/8, get_bits_count(&s->gb));
1495
            }
1496
        }
1497
    }
1498
    if (s->got_picture) {
1499
        av_log(avctx, AV_LOG_WARNING, "EOI missing, emulating\n");
1500
        goto eoi_parser;
1501
    }
1502
    av_log(avctx, AV_LOG_FATAL, "No JPEG data found in image\n");
1503
    return -1;
1504
the_end:
1505
    av_log(avctx, AV_LOG_DEBUG, "mjpeg decode frame unused %td bytes\n", buf_end - buf_ptr);
1506
//    return buf_end - buf_ptr;
1507
    return buf_ptr - buf;
1508
}
1509

    
1510
av_cold int ff_mjpeg_decode_end(AVCodecContext *avctx)
1511
{
1512
    MJpegDecodeContext *s = avctx->priv_data;
1513
    int i, j;
1514

    
1515
    if (s->picture.data[0])
1516
        avctx->release_buffer(avctx, &s->picture);
1517

    
1518
    av_free(s->buffer);
1519
    av_free(s->qscale_table);
1520
    av_freep(&s->ljpeg_buffer);
1521
    s->ljpeg_buffer_size=0;
1522

    
1523
    for(i=0;i<2;i++) {
1524
        for(j=0;j<4;j++)
1525
            free_vlc(&s->vlcs[i][j]);
1526
    }
1527
    for(i=0; i<MAX_COMPONENTS; i++) {
1528
        av_freep(&s->blocks[i]);
1529
        av_freep(&s->last_nnz[i]);
1530
    }
1531
    return 0;
1532
}
1533

    
1534
AVCodec mjpeg_decoder = {
1535
    "mjpeg",
1536
    AVMEDIA_TYPE_VIDEO,
1537
    CODEC_ID_MJPEG,
1538
    sizeof(MJpegDecodeContext),
1539
    ff_mjpeg_decode_init,
1540
    NULL,
1541
    ff_mjpeg_decode_end,
1542
    ff_mjpeg_decode_frame,
1543
    CODEC_CAP_DR1,
1544
    NULL,
1545
    .long_name = NULL_IF_CONFIG_SMALL("MJPEG (Motion JPEG)"),
1546
};
1547

    
1548
AVCodec thp_decoder = {
1549
    "thp",
1550
    AVMEDIA_TYPE_VIDEO,
1551
    CODEC_ID_THP,
1552
    sizeof(MJpegDecodeContext),
1553
    ff_mjpeg_decode_init,
1554
    NULL,
1555
    ff_mjpeg_decode_end,
1556
    ff_mjpeg_decode_frame,
1557
    CODEC_CAP_DR1,
1558
    NULL,
1559
    .long_name = NULL_IF_CONFIG_SMALL("Nintendo Gamecube THP video"),
1560
};