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1
/*
2
 * ASUS V1 codec
3
 * Copyright (c) 2003 Michael Niedermayer
4
 *
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 * This library is free software; you can redistribute it and/or
6
 * 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 of the License, or (at your option) any later version.
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 *
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 * This library 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
13
 * 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 this library; if not, write to the Free Software
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 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
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 */
19
 
20
/**
21
 * @file asv1.c
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 * ASUS V1 codec.
23
 */
24
 
25
#include "avcodec.h"
26
#include "dsputil.h"
27
#include "mpegvideo.h"
28

    
29
//#undef NDEBUG
30
//#include <assert.h>
31

    
32
#define VLC_BITS 5
33

    
34
typedef struct ASV1Context{
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    AVCodecContext *avctx;
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    DSPContext dsp;
37
    AVFrame picture;
38
    PutBitContext pb;
39
    GetBitContext gb;
40
    ScanTable scantable;
41
    int inv_qscale;
42
    int mb_width;
43
    int mb_height;
44
    int mb_width2;
45
    int mb_height2;
46
    DCTELEM __align8 block[6][64];
47
    uint16_t __align8 intra_matrix[64];
48
    int __align8 q_intra_matrix[64];
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    uint8_t *bitstream_buffer;
50
    int bitstream_buffer_size;
51
} ASV1Context;
52

    
53
static const uint8_t scantab[64]={
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    0x00,0x08,0x01,0x09,0x10,0x18,0x11,0x19,
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    0x02,0x0A,0x03,0x0B,0x12,0x1A,0x13,0x1B,
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    0x04,0x0C,0x05,0x0D,0x20,0x28,0x21,0x29,
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    0x06,0x0E,0x07,0x0F,0x14,0x1C,0x15,0x1D,
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    0x22,0x2A,0x23,0x2B,0x30,0x38,0x31,0x39,
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};
60

    
61
static const uint8_t ccp_tab[17][2]={
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    {0x2,2}, {0xE,5}, {0xD,5}, {0xC,5},
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    {0xB,5}, {0xA,5}, {0x9,5}, {0x8,5},
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    {0x7,5}, {0x6,5}, {0x5,5}, {0x4,5},
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    {0x3,5}, {0x2,5}, {0x1,5}, {0x3,2},
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    {0xF,5}, //EOB
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};
68

    
69
static const uint8_t level_tab[7][2]={
70
    {3,4}, {3,3}, {3,2}, {0,3}, {2,2}, {2,3}, {2,4}
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};
72

    
73
static VLC ccp_vlc;
74
static VLC level_vlc;
75

    
76
static void init_vlcs(ASV1Context *a){
77
    static int done = 0;
78

    
79
    if (!done) {
80
        done = 1;
81

    
82
        init_vlc(&ccp_vlc, VLC_BITS, 17, 
83
                 &ccp_tab[0][1], 2, 1,
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                 &ccp_tab[0][0], 2, 1);
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        init_vlc(&level_vlc,  VLC_BITS, 7, 
86
                 &level_tab[0][1], 2, 1,
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                 &level_tab[0][0], 2, 1);
88
    }
89
}
90

    
91
static inline int get_level(GetBitContext *gb){
92
    int code= get_vlc2(gb, level_vlc.table, VLC_BITS, 1);
93

    
94
    if(code==3) return get_sbits(gb, 8);
95
    else        return code - 3;
96
}
97

    
98
#ifdef CONFIG_ENCODERS
99

    
100
static inline void put_level(PutBitContext *pb, int level){
101
    unsigned int index= level + 3;
102

    
103
    if(index <= 6) put_bits(pb, level_tab[index][1], level_tab[index][0]);
104
    else{
105
        put_bits(pb, level_tab[3][1], level_tab[3][0]);
106
        put_bits(pb, 8, level&0xFF);
107
    }
108
}
109

    
110
#endif //CONFIG_ENCODERS
111

    
112
static inline int decode_block(ASV1Context *a, DCTELEM block[64]){
113
    int i;
114

    
115
    block[0]= 8*get_bits(&a->gb, 8);
116
    
117
    for(i=0; i<11; i++){
118
        const int ccp= get_vlc2(&a->gb, ccp_vlc.table, VLC_BITS, 1);
119

    
120
        if(ccp){
121
            if(ccp == 16) break;
122
            if(ccp < 0 || i>=10){
123
                printf("coded coeff pattern damaged\n");
124
                return -1;
125
            }
126

    
127
            if(ccp&1) block[a->scantable.permutated[4*i+0]]= (get_level(&a->gb) * a->intra_matrix[4*i+0])>>4;
128
            if(ccp&2) block[a->scantable.permutated[4*i+1]]= (get_level(&a->gb) * a->intra_matrix[4*i+1])>>4;;
129
            if(ccp&4) block[a->scantable.permutated[4*i+2]]= (get_level(&a->gb) * a->intra_matrix[4*i+2])>>4;;
130
            if(ccp&8) block[a->scantable.permutated[4*i+3]]= (get_level(&a->gb) * a->intra_matrix[4*i+3])>>4;;
131
        }
132
    }
133

    
134
    return 0;
135
}
136

    
137
#ifdef CONFIG_ENCODERS
138

    
139
static inline void encode_block(ASV1Context *a, DCTELEM block[64]){
140
    int i;
141
    int nc_count=0;
142
    
143
    put_bits(&a->pb, 8, (block[0] + 32)>>6);
144
    block[0]= 0;
145
    
146
    for(i=0; i<10; i++){
147
        const int index= scantab[4*i];
148
        int ccp=0;
149

    
150
        if( (block[index + 0] = (block[index + 0]*a->q_intra_matrix[index + 0] + (1<<15))>>16) ) ccp |= 1;
151
        if( (block[index + 8] = (block[index + 8]*a->q_intra_matrix[index + 8] + (1<<15))>>16) ) ccp |= 2;
152
        if( (block[index + 1] = (block[index + 1]*a->q_intra_matrix[index + 1] + (1<<15))>>16) ) ccp |= 4;
153
        if( (block[index + 9] = (block[index + 9]*a->q_intra_matrix[index + 9] + (1<<15))>>16) ) ccp |= 8;
154

    
155
        if(ccp){
156
            for(;nc_count; nc_count--) 
157
                put_bits(&a->pb, ccp_tab[0][1], ccp_tab[0][0]);
158

    
159
            put_bits(&a->pb, ccp_tab[ccp][1], ccp_tab[ccp][0]);
160
            
161
            if(ccp&1) put_level(&a->pb, block[index + 0]);
162
            if(ccp&2) put_level(&a->pb, block[index + 8]);
163
            if(ccp&4) put_level(&a->pb, block[index + 1]);
164
            if(ccp&8) put_level(&a->pb, block[index + 9]);
165
        }else{
166
            nc_count++;
167
        }
168
    }
169
    put_bits(&a->pb, ccp_tab[16][1], ccp_tab[16][0]);
170
}
171

    
172
#endif //CONFIG_ENCODERS
173

    
174
static inline int decode_mb(ASV1Context *a, DCTELEM block[6][64]){
175
    int i;
176

    
177
    a->dsp.clear_blocks(block[0]);
178
    
179
    for(i=0; i<6; i++){
180
        if( decode_block(a, block[i]) < 0) 
181
            return -1;
182
    }
183
    return 0;
184
}
185

    
186
#ifdef CONFIG_ENCODERS
187

    
188
static inline void encode_mb(ASV1Context *a, DCTELEM block[6][64]){
189
    int i;
190

    
191
    for(i=0; i<6; i++){
192
        encode_block(a, block[i]);
193
    }
194
}
195
        
196
#endif //CONFIG_ENCODERS
197

    
198
static inline void idct_put(ASV1Context *a, int mb_x, int mb_y){
199
    DCTELEM (*block)[64]= a->block;
200
    int linesize= a->picture.linesize[0];
201
    
202
    uint8_t *dest_y  = a->picture.data[0] + (mb_y * 16* linesize              ) + mb_x * 16;
203
    uint8_t *dest_cb = a->picture.data[1] + (mb_y * 8 * a->picture.linesize[1]) + mb_x * 8;
204
    uint8_t *dest_cr = a->picture.data[2] + (mb_y * 8 * a->picture.linesize[2]) + mb_x * 8;
205

    
206
    a->dsp.idct_put(dest_y                 , linesize, block[0]);
207
    a->dsp.idct_put(dest_y              + 8, linesize, block[1]);
208
    a->dsp.idct_put(dest_y + 8*linesize    , linesize, block[2]);
209
    a->dsp.idct_put(dest_y + 8*linesize + 8, linesize, block[3]);
210

    
211
    if(!(a->avctx->flags&CODEC_FLAG_GRAY)){
212
        a->dsp.idct_put(dest_cb, a->picture.linesize[1], block[4]);
213
        a->dsp.idct_put(dest_cr, a->picture.linesize[2], block[5]);
214
    }
215
}
216

    
217
#ifdef CONFIG_ENCODERS
218

    
219
static inline void dct_get(ASV1Context *a, int mb_x, int mb_y){
220
    DCTELEM (*block)[64]= a->block;
221
    int linesize= a->picture.linesize[0];
222
    int i;
223
    
224
    uint8_t *ptr_y  = a->picture.data[0] + (mb_y * 16* linesize              ) + mb_x * 16;
225
    uint8_t *ptr_cb = a->picture.data[1] + (mb_y * 8 * a->picture.linesize[1]) + mb_x * 8;
226
    uint8_t *ptr_cr = a->picture.data[2] + (mb_y * 8 * a->picture.linesize[2]) + mb_x * 8;
227

    
228
    a->dsp.get_pixels(block[0], ptr_y                 , linesize);
229
    a->dsp.get_pixels(block[1], ptr_y              + 8, linesize);
230
    a->dsp.get_pixels(block[2], ptr_y + 8*linesize    , linesize);
231
    a->dsp.get_pixels(block[3], ptr_y + 8*linesize + 8, linesize);
232
    for(i=0; i<4; i++)
233
        a->dsp.fdct(block[i]);
234
    
235
    if(!(a->avctx->flags&CODEC_FLAG_GRAY)){
236
        a->dsp.get_pixels(block[4], ptr_cb, a->picture.linesize[1]);
237
        a->dsp.get_pixels(block[5], ptr_cr, a->picture.linesize[2]);
238
        for(i=4; i<6; i++)
239
            a->dsp.fdct(block[i]);
240
    }
241
}
242

    
243
#endif //CONFIG_ENCODERS
244

    
245
static int decode_frame(AVCodecContext *avctx, 
246
                        void *data, int *data_size,
247
                        uint8_t *buf, int buf_size)
248
{
249
    ASV1Context * const a = avctx->priv_data;
250
    AVFrame *picture = data;
251
    AVFrame * const p= (AVFrame*)&a->picture;
252
    int mb_x, mb_y;
253

    
254
    *data_size = 0;
255

    
256
    /* special case for last picture */
257
    if (buf_size == 0) {
258
        return 0;
259
    }
260

    
261
    if(p->data[0])
262
        avctx->release_buffer(avctx, p);
263

    
264
    p->reference= 0;
265
    if(avctx->get_buffer(avctx, p) < 0){
266
        fprintf(stderr, "get_buffer() failed\n");
267
        return -1;
268
    }
269
    p->pict_type= I_TYPE;
270
    p->key_frame= 1;
271

    
272
    a->bitstream_buffer= av_fast_realloc(a->bitstream_buffer, &a->bitstream_buffer_size, buf_size + FF_INPUT_BUFFER_PADDING_SIZE);
273
    a->dsp.bswap_buf((uint32_t*)a->bitstream_buffer, (uint32_t*)buf, buf_size/4);
274
    init_get_bits(&a->gb, a->bitstream_buffer, buf_size*8);
275

    
276
    for(mb_y=0; mb_y<a->mb_height2; mb_y++){
277
        for(mb_x=0; mb_x<a->mb_width2; mb_x++){
278
            if( decode_mb(a, a->block) <0)
279
                return -1;
280
             
281
            idct_put(a, mb_x, mb_y);
282
        }
283
    }
284

    
285
    if(a->mb_width2 != a->mb_width){
286
        mb_x= a->mb_width2;
287
        for(mb_y=0; mb_y<a->mb_height2; mb_y++){
288
            if( decode_mb(a, a->block) <0)
289
                return -1;
290
             
291
            idct_put(a, mb_x, mb_y);
292
        }
293
    }
294

    
295
    if(a->mb_height2 != a->mb_height){
296
        mb_y= a->mb_height2;
297
        for(mb_x=0; mb_x<a->mb_width; mb_x++){
298
            if( decode_mb(a, a->block) <0)
299
                return -1;
300
             
301
            idct_put(a, mb_x, mb_y);
302
        }
303
    }
304
#if 0    
305
int i;
306
printf("%d %d\n", 8*buf_size, get_bits_count(&a->gb));
307
for(i=get_bits_count(&a->gb); i<8*buf_size; i++){
308
    printf("%d", get_bits1(&a->gb));
309
}
310

311
for(i=0; i<s->avctx->extradata_size; i++){
312
    printf("%c\n", ((uint8_t*)s->avctx->extradata)[i]);
313
}
314
#endif
315

    
316
    p->quality= (32 + a->inv_qscale/2)/a->inv_qscale;
317
    memset(p->qscale_table, p->quality, p->qstride*a->mb_height);
318
    
319
    *picture= *(AVFrame*)&a->picture;
320
    *data_size = sizeof(AVPicture);
321

    
322
    emms_c();
323
    
324
    return (get_bits_count(&a->gb)+31)/32*4;
325
}
326

    
327
#ifdef CONFIG_ENCODERS
328

    
329
static int encode_frame(AVCodecContext *avctx, unsigned char *buf, int buf_size, void *data){
330
    ASV1Context * const a = avctx->priv_data;
331
    AVFrame *pict = data;
332
    AVFrame * const p= (AVFrame*)&a->picture;
333
    int size;
334
    int mb_x, mb_y;
335

    
336
    init_put_bits(&a->pb, buf, buf_size, NULL, NULL);
337
    
338
    *p = *pict;
339
    p->pict_type= I_TYPE;
340
    p->key_frame= 1;
341

    
342
    for(mb_y=0; mb_y<a->mb_height2; mb_y++){
343
        for(mb_x=0; mb_x<a->mb_width2; mb_x++){
344
            dct_get(a, mb_x, mb_y);
345
            encode_mb(a, a->block);
346
        }
347
    }
348

    
349
    if(a->mb_width2 != a->mb_width){
350
        mb_x= a->mb_width2;
351
        for(mb_y=0; mb_y<a->mb_height2; mb_y++){
352
            dct_get(a, mb_x, mb_y);
353
            encode_mb(a, a->block);
354
        }
355
    }
356

    
357
    if(a->mb_height2 != a->mb_height){
358
        mb_y= a->mb_height2;
359
        for(mb_x=0; mb_x<a->mb_width; mb_x++){
360
            dct_get(a, mb_x, mb_y);
361
            encode_mb(a, a->block);
362
        }
363
    }
364
    emms_c();
365
    
366
    align_put_bits(&a->pb);
367
    while(get_bit_count(&a->pb)&31)
368
        put_bits(&a->pb, 8, 0);
369
    
370
    size= get_bit_count(&a->pb)/32;
371
    
372
    a->dsp.bswap_buf((uint32_t*)buf, (uint32_t*)buf, size);
373
    
374
    return size*4;
375
}
376

    
377
#endif //CONFIG_ENCODERS
378

    
379
static void common_init(AVCodecContext *avctx){
380
    ASV1Context * const a = avctx->priv_data;
381

    
382
    dsputil_init(&a->dsp, avctx);
383

    
384
    a->mb_width   = (avctx->width  + 15) / 16;
385
    a->mb_height  = (avctx->height + 15) / 16;
386
    a->mb_width2  = (avctx->width  + 0) / 16;
387
    a->mb_height2 = (avctx->height + 0) / 16;
388

    
389
    avctx->coded_frame= (AVFrame*)&a->picture;
390
    a->avctx= avctx;
391
}
392

    
393
static int decode_init(AVCodecContext *avctx){
394
    ASV1Context * const a = avctx->priv_data;
395
    AVFrame *p= (AVFrame*)&a->picture;
396
    int i;
397
 
398
    common_init(avctx);
399
    init_vlcs(a);
400
    ff_init_scantable(a->dsp.idct_permutation, &a->scantable, scantab);
401

    
402
    a->inv_qscale= le2me_32(((uint32_t*)avctx->extradata)[0]);
403
    if(a->inv_qscale == 0){
404
        printf("illegal qscale 0\n");
405
        a->inv_qscale= 6;
406
    }
407

    
408
    for(i=0; i<64; i++){
409
        int index= scantab[i];
410
        a->intra_matrix[i]= 64*ff_mpeg1_default_intra_matrix[index] / a->inv_qscale;
411
    }
412

    
413
    p->qstride= a->mb_width;
414
    p->qscale_table= av_mallocz( p->qstride * a->mb_height);
415

    
416
    return 0;
417
}
418

    
419
#ifdef CONFIG_ENCODERS
420

    
421
static int encode_init(AVCodecContext *avctx){
422
    ASV1Context * const a = avctx->priv_data;
423
    int i;
424
 
425
    common_init(avctx);
426
    
427
    if(avctx->global_quality == 0) avctx->global_quality= 4*FF_QUALITY_SCALE;
428

    
429
    a->inv_qscale= (32*FF_QUALITY_SCALE +  avctx->global_quality/2) / avctx->global_quality;
430
    
431
    avctx->extradata= av_mallocz(8);
432
    avctx->extradata_size=8;
433
    ((uint32_t*)avctx->extradata)[0]= le2me_32(a->inv_qscale);
434
    ((uint32_t*)avctx->extradata)[1]= le2me_32(ff_get_fourcc("ASUS"));
435
    
436
    for(i=0; i<64; i++){
437
        int q= 32*ff_mpeg1_default_intra_matrix[i];
438
        a->q_intra_matrix[i]= ((a->inv_qscale<<16) + q/2) / q;
439
    }
440

    
441
    return 0;
442
}
443

    
444
#endif //CONFIG_ENCODERS
445

    
446
static int decode_end(AVCodecContext *avctx){
447
    ASV1Context * const a = avctx->priv_data;
448

    
449
    av_freep(&a->bitstream_buffer);
450
    av_freep(&a->picture.qscale_table);
451
    a->bitstream_buffer_size=0;
452
    
453
    avcodec_default_free_buffers(avctx);
454

    
455
    return 0;
456
}
457

    
458
AVCodec asv1_decoder = {
459
    "asv1",
460
    CODEC_TYPE_VIDEO,
461
    CODEC_ID_ASV1,
462
    sizeof(ASV1Context),
463
    decode_init,
464
    NULL,
465
    decode_end,
466
    decode_frame,
467
    CODEC_CAP_DR1,
468
};
469

    
470
#ifdef CONFIG_ENCODERS
471

    
472
AVCodec asv1_encoder = {
473
    "asv1",
474
    CODEC_TYPE_VIDEO,
475
    CODEC_ID_ASV1,
476
    sizeof(ASV1Context),
477
    encode_init,
478
    encode_frame,
479
    //encode_end,
480
};
481

    
482
#endif //CONFIG_ENCODERS