Statistics
| Branch: | Revision:

ffmpeg / libavcodec / asv1.c @ d37f007d

History | View | Annotate | Download (19.3 KB)

1
/*
2
 * ASUS V1/V2 codec
3
 * Copyright (c) 2003 Michael Niedermayer
4
 *
5
 * This file is part of FFmpeg.
6
 *
7
 * FFmpeg is free software; you can redistribute it and/or
8
 * modify it under the terms of the GNU Lesser General Public
9
 * License as published by the Free Software Foundation; either
10
 * version 2.1 of the License, or (at your option) any later version.
11
 *
12
 * FFmpeg is distributed in the hope that it will be useful,
13
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
15
 * Lesser General Public License for more details.
16
 *
17
 * You should have received a copy of the GNU Lesser General Public
18
 * License along with FFmpeg; if not, write to the Free Software
19
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20
 */
21

    
22
/**
23
 * @file asv1.c
24
 * ASUS V1/V2 codec.
25
 */
26

    
27
#include "avcodec.h"
28
#include "bitstream.h"
29
#include "dsputil.h"
30
#include "mpeg12data.h"
31

    
32
//#undef NDEBUG
33
//#include <assert.h>
34

    
35
#define VLC_BITS 6
36
#define ASV2_LEVEL_VLC_BITS 10
37

    
38
typedef struct ASV1Context{
39
    AVCodecContext *avctx;
40
    DSPContext dsp;
41
    AVFrame picture;
42
    PutBitContext pb;
43
    GetBitContext gb;
44
    ScanTable scantable;
45
    int inv_qscale;
46
    int mb_width;
47
    int mb_height;
48
    int mb_width2;
49
    int mb_height2;
50
    DECLARE_ALIGNED_8(DCTELEM, block[6][64]);
51
    DECLARE_ALIGNED_8(uint16_t, intra_matrix[64]);
52
    DECLARE_ALIGNED_8(int, q_intra_matrix[64]);
53
    uint8_t *bitstream_buffer;
54
    unsigned int bitstream_buffer_size;
55
} ASV1Context;
56

    
57
static const uint8_t scantab[64]={
58
    0x00,0x08,0x01,0x09,0x10,0x18,0x11,0x19,
59
    0x02,0x0A,0x03,0x0B,0x12,0x1A,0x13,0x1B,
60
    0x04,0x0C,0x05,0x0D,0x20,0x28,0x21,0x29,
61
    0x06,0x0E,0x07,0x0F,0x14,0x1C,0x15,0x1D,
62
    0x22,0x2A,0x23,0x2B,0x30,0x38,0x31,0x39,
63
    0x16,0x1E,0x17,0x1F,0x24,0x2C,0x25,0x2D,
64
    0x32,0x3A,0x33,0x3B,0x26,0x2E,0x27,0x2F,
65
    0x34,0x3C,0x35,0x3D,0x36,0x3E,0x37,0x3F,
66
};
67

    
68

    
69
static const uint8_t ccp_tab[17][2]={
70
    {0x2,2}, {0x7,5}, {0xB,5}, {0x3,5},
71
    {0xD,5}, {0x5,5}, {0x9,5}, {0x1,5},
72
    {0xE,5}, {0x6,5}, {0xA,5}, {0x2,5},
73
    {0xC,5}, {0x4,5}, {0x8,5}, {0x3,2},
74
    {0xF,5}, //EOB
75
};
76

    
77
static const uint8_t level_tab[7][2]={
78
    {3,4}, {3,3}, {3,2}, {0,3}, {2,2}, {2,3}, {2,4}
79
};
80

    
81
static const uint8_t dc_ccp_tab[8][2]={
82
    {0x1,2}, {0xD,4}, {0xF,4}, {0xC,4},
83
    {0x5,3}, {0xE,4}, {0x4,3}, {0x0,2},
84
};
85

    
86
static const uint8_t ac_ccp_tab[16][2]={
87
    {0x00,2}, {0x3B,6}, {0x0A,4}, {0x3A,6},
88
    {0x02,3}, {0x39,6}, {0x3C,6}, {0x38,6},
89
    {0x03,3}, {0x3D,6}, {0x08,4}, {0x1F,5},
90
    {0x09,4}, {0x0B,4}, {0x0D,4}, {0x0C,4},
91
};
92

    
93
static const uint8_t asv2_level_tab[63][2]={
94
    {0x3F,10},{0x2F,10},{0x37,10},{0x27,10},{0x3B,10},{0x2B,10},{0x33,10},{0x23,10},
95
    {0x3D,10},{0x2D,10},{0x35,10},{0x25,10},{0x39,10},{0x29,10},{0x31,10},{0x21,10},
96
    {0x1F, 8},{0x17, 8},{0x1B, 8},{0x13, 8},{0x1D, 8},{0x15, 8},{0x19, 8},{0x11, 8},
97
    {0x0F, 6},{0x0B, 6},{0x0D, 6},{0x09, 6},
98
    {0x07, 4},{0x05, 4},
99
    {0x03, 2},
100
    {0x00, 5},
101
    {0x02, 2},
102
    {0x04, 4},{0x06, 4},
103
    {0x08, 6},{0x0C, 6},{0x0A, 6},{0x0E, 6},
104
    {0x10, 8},{0x18, 8},{0x14, 8},{0x1C, 8},{0x12, 8},{0x1A, 8},{0x16, 8},{0x1E, 8},
105
    {0x20,10},{0x30,10},{0x28,10},{0x38,10},{0x24,10},{0x34,10},{0x2C,10},{0x3C,10},
106
    {0x22,10},{0x32,10},{0x2A,10},{0x3A,10},{0x26,10},{0x36,10},{0x2E,10},{0x3E,10},
107
};
108

    
109

    
110
static VLC ccp_vlc;
111
static VLC level_vlc;
112
static VLC dc_ccp_vlc;
113
static VLC ac_ccp_vlc;
114
static VLC asv2_level_vlc;
115

    
116
static void init_vlcs(ASV1Context *a){
117
    static int done = 0;
118

    
119
    if (!done) {
120
        done = 1;
121

    
122
        init_vlc(&ccp_vlc, VLC_BITS, 17,
123
                 &ccp_tab[0][1], 2, 1,
124
                 &ccp_tab[0][0], 2, 1, 1);
125
        init_vlc(&dc_ccp_vlc, VLC_BITS, 8,
126
                 &dc_ccp_tab[0][1], 2, 1,
127
                 &dc_ccp_tab[0][0], 2, 1, 1);
128
        init_vlc(&ac_ccp_vlc, VLC_BITS, 16,
129
                 &ac_ccp_tab[0][1], 2, 1,
130
                 &ac_ccp_tab[0][0], 2, 1, 1);
131
        init_vlc(&level_vlc,  VLC_BITS, 7,
132
                 &level_tab[0][1], 2, 1,
133
                 &level_tab[0][0], 2, 1, 1);
134
        init_vlc(&asv2_level_vlc, ASV2_LEVEL_VLC_BITS, 63,
135
                 &asv2_level_tab[0][1], 2, 1,
136
                 &asv2_level_tab[0][0], 2, 1, 1);
137
    }
138
}
139

    
140
//FIXME write a reversed bitstream reader to avoid the double reverse
141
static inline int asv2_get_bits(GetBitContext *gb, int n){
142
    return ff_reverse[ get_bits(gb, n) << (8-n) ];
143
}
144

    
145
static inline void asv2_put_bits(PutBitContext *pb, int n, int v){
146
    put_bits(pb, n, ff_reverse[ v << (8-n) ]);
147
}
148

    
149
static inline int asv1_get_level(GetBitContext *gb){
150
    int code= get_vlc2(gb, level_vlc.table, VLC_BITS, 1);
151

    
152
    if(code==3) return get_sbits(gb, 8);
153
    else        return code - 3;
154
}
155

    
156
static inline int asv2_get_level(GetBitContext *gb){
157
    int code= get_vlc2(gb, asv2_level_vlc.table, ASV2_LEVEL_VLC_BITS, 1);
158

    
159
    if(code==31) return (int8_t)asv2_get_bits(gb, 8);
160
    else         return code - 31;
161
}
162

    
163
static inline void asv1_put_level(PutBitContext *pb, int level){
164
    unsigned int index= level + 3;
165

    
166
    if(index <= 6) put_bits(pb, level_tab[index][1], level_tab[index][0]);
167
    else{
168
        put_bits(pb, level_tab[3][1], level_tab[3][0]);
169
        put_bits(pb, 8, level&0xFF);
170
    }
171
}
172

    
173
static inline void asv2_put_level(PutBitContext *pb, int level){
174
    unsigned int index= level + 31;
175

    
176
    if(index <= 62) put_bits(pb, asv2_level_tab[index][1], asv2_level_tab[index][0]);
177
    else{
178
        put_bits(pb, asv2_level_tab[31][1], asv2_level_tab[31][0]);
179
        asv2_put_bits(pb, 8, level&0xFF);
180
    }
181
}
182

    
183
static inline int asv1_decode_block(ASV1Context *a, DCTELEM block[64]){
184
    int i;
185

    
186
    block[0]= 8*get_bits(&a->gb, 8);
187

    
188
    for(i=0; i<11; i++){
189
        const int ccp= get_vlc2(&a->gb, ccp_vlc.table, VLC_BITS, 1);
190

    
191
        if(ccp){
192
            if(ccp == 16) break;
193
            if(ccp < 0 || i>=10){
194
                av_log(a->avctx, AV_LOG_ERROR, "coded coeff pattern damaged\n");
195
                return -1;
196
            }
197

    
198
            if(ccp&8) block[a->scantable.permutated[4*i+0]]= (asv1_get_level(&a->gb) * a->intra_matrix[4*i+0])>>4;
199
            if(ccp&4) block[a->scantable.permutated[4*i+1]]= (asv1_get_level(&a->gb) * a->intra_matrix[4*i+1])>>4;
200
            if(ccp&2) block[a->scantable.permutated[4*i+2]]= (asv1_get_level(&a->gb) * a->intra_matrix[4*i+2])>>4;
201
            if(ccp&1) block[a->scantable.permutated[4*i+3]]= (asv1_get_level(&a->gb) * a->intra_matrix[4*i+3])>>4;
202
        }
203
    }
204

    
205
    return 0;
206
}
207

    
208
static inline int asv2_decode_block(ASV1Context *a, DCTELEM block[64]){
209
    int i, count, ccp;
210

    
211
    count= asv2_get_bits(&a->gb, 4);
212

    
213
    block[0]= 8*asv2_get_bits(&a->gb, 8);
214

    
215
    ccp= get_vlc2(&a->gb, dc_ccp_vlc.table, VLC_BITS, 1);
216
    if(ccp){
217
        if(ccp&4) block[a->scantable.permutated[1]]= (asv2_get_level(&a->gb) * a->intra_matrix[1])>>4;
218
        if(ccp&2) block[a->scantable.permutated[2]]= (asv2_get_level(&a->gb) * a->intra_matrix[2])>>4;
219
        if(ccp&1) block[a->scantable.permutated[3]]= (asv2_get_level(&a->gb) * a->intra_matrix[3])>>4;
220
    }
221

    
222
    for(i=1; i<count+1; i++){
223
        const int ccp= get_vlc2(&a->gb, ac_ccp_vlc.table, VLC_BITS, 1);
224

    
225
        if(ccp){
226
            if(ccp&8) block[a->scantable.permutated[4*i+0]]= (asv2_get_level(&a->gb) * a->intra_matrix[4*i+0])>>4;
227
            if(ccp&4) block[a->scantable.permutated[4*i+1]]= (asv2_get_level(&a->gb) * a->intra_matrix[4*i+1])>>4;
228
            if(ccp&2) block[a->scantable.permutated[4*i+2]]= (asv2_get_level(&a->gb) * a->intra_matrix[4*i+2])>>4;
229
            if(ccp&1) block[a->scantable.permutated[4*i+3]]= (asv2_get_level(&a->gb) * a->intra_matrix[4*i+3])>>4;
230
        }
231
    }
232

    
233
    return 0;
234
}
235

    
236
static inline void asv1_encode_block(ASV1Context *a, DCTELEM block[64]){
237
    int i;
238
    int nc_count=0;
239

    
240
    put_bits(&a->pb, 8, (block[0] + 32)>>6);
241
    block[0]= 0;
242

    
243
    for(i=0; i<10; i++){
244
        const int index= scantab[4*i];
245
        int ccp=0;
246

    
247
        if( (block[index + 0] = (block[index + 0]*a->q_intra_matrix[index + 0] + (1<<15))>>16) ) ccp |= 8;
248
        if( (block[index + 8] = (block[index + 8]*a->q_intra_matrix[index + 8] + (1<<15))>>16) ) ccp |= 4;
249
        if( (block[index + 1] = (block[index + 1]*a->q_intra_matrix[index + 1] + (1<<15))>>16) ) ccp |= 2;
250
        if( (block[index + 9] = (block[index + 9]*a->q_intra_matrix[index + 9] + (1<<15))>>16) ) ccp |= 1;
251

    
252
        if(ccp){
253
            for(;nc_count; nc_count--)
254
                put_bits(&a->pb, ccp_tab[0][1], ccp_tab[0][0]);
255

    
256
            put_bits(&a->pb, ccp_tab[ccp][1], ccp_tab[ccp][0]);
257

    
258
            if(ccp&8) asv1_put_level(&a->pb, block[index + 0]);
259
            if(ccp&4) asv1_put_level(&a->pb, block[index + 8]);
260
            if(ccp&2) asv1_put_level(&a->pb, block[index + 1]);
261
            if(ccp&1) asv1_put_level(&a->pb, block[index + 9]);
262
        }else{
263
            nc_count++;
264
        }
265
    }
266
    put_bits(&a->pb, ccp_tab[16][1], ccp_tab[16][0]);
267
}
268

    
269
static inline void asv2_encode_block(ASV1Context *a, DCTELEM block[64]){
270
    int i;
271
    int count=0;
272

    
273
    for(count=63; count>3; count--){
274
        const int index= scantab[count];
275

    
276
        if( (block[index]*a->q_intra_matrix[index] + (1<<15))>>16 )
277
            break;
278
    }
279

    
280
    count >>= 2;
281

    
282
    asv2_put_bits(&a->pb, 4, count);
283
    asv2_put_bits(&a->pb, 8, (block[0] + 32)>>6);
284
    block[0]= 0;
285

    
286
    for(i=0; i<=count; i++){
287
        const int index= scantab[4*i];
288
        int ccp=0;
289

    
290
        if( (block[index + 0] = (block[index + 0]*a->q_intra_matrix[index + 0] + (1<<15))>>16) ) ccp |= 8;
291
        if( (block[index + 8] = (block[index + 8]*a->q_intra_matrix[index + 8] + (1<<15))>>16) ) ccp |= 4;
292
        if( (block[index + 1] = (block[index + 1]*a->q_intra_matrix[index + 1] + (1<<15))>>16) ) ccp |= 2;
293
        if( (block[index + 9] = (block[index + 9]*a->q_intra_matrix[index + 9] + (1<<15))>>16) ) ccp |= 1;
294

    
295
        assert(i || ccp<8);
296
        if(i) put_bits(&a->pb, ac_ccp_tab[ccp][1], ac_ccp_tab[ccp][0]);
297
        else  put_bits(&a->pb, dc_ccp_tab[ccp][1], dc_ccp_tab[ccp][0]);
298

    
299
        if(ccp){
300
            if(ccp&8) asv2_put_level(&a->pb, block[index + 0]);
301
            if(ccp&4) asv2_put_level(&a->pb, block[index + 8]);
302
            if(ccp&2) asv2_put_level(&a->pb, block[index + 1]);
303
            if(ccp&1) asv2_put_level(&a->pb, block[index + 9]);
304
        }
305
    }
306
}
307

    
308
static inline int decode_mb(ASV1Context *a, DCTELEM block[6][64]){
309
    int i;
310

    
311
    a->dsp.clear_blocks(block[0]);
312

    
313
    if(a->avctx->codec_id == CODEC_ID_ASV1){
314
        for(i=0; i<6; i++){
315
            if( asv1_decode_block(a, block[i]) < 0)
316
                return -1;
317
        }
318
    }else{
319
        for(i=0; i<6; i++){
320
            if( asv2_decode_block(a, block[i]) < 0)
321
                return -1;
322
        }
323
    }
324
    return 0;
325
}
326

    
327
static inline int encode_mb(ASV1Context *a, DCTELEM block[6][64]){
328
    int i;
329

    
330
    if(a->pb.buf_end - a->pb.buf - (put_bits_count(&a->pb)>>3) < 30*16*16*3/2/8){
331
        av_log(a->avctx, AV_LOG_ERROR, "encoded frame too large\n");
332
        return -1;
333
    }
334

    
335
    if(a->avctx->codec_id == CODEC_ID_ASV1){
336
        for(i=0; i<6; i++)
337
            asv1_encode_block(a, block[i]);
338
    }else{
339
        for(i=0; i<6; i++)
340
            asv2_encode_block(a, block[i]);
341
    }
342
    return 0;
343
}
344

    
345
static inline void idct_put(ASV1Context *a, int mb_x, int mb_y){
346
    DCTELEM (*block)[64]= a->block;
347
    int linesize= a->picture.linesize[0];
348

    
349
    uint8_t *dest_y  = a->picture.data[0] + (mb_y * 16* linesize              ) + mb_x * 16;
350
    uint8_t *dest_cb = a->picture.data[1] + (mb_y * 8 * a->picture.linesize[1]) + mb_x * 8;
351
    uint8_t *dest_cr = a->picture.data[2] + (mb_y * 8 * a->picture.linesize[2]) + mb_x * 8;
352

    
353
    a->dsp.idct_put(dest_y                 , linesize, block[0]);
354
    a->dsp.idct_put(dest_y              + 8, linesize, block[1]);
355
    a->dsp.idct_put(dest_y + 8*linesize    , linesize, block[2]);
356
    a->dsp.idct_put(dest_y + 8*linesize + 8, linesize, block[3]);
357

    
358
    if(!(a->avctx->flags&CODEC_FLAG_GRAY)){
359
        a->dsp.idct_put(dest_cb, a->picture.linesize[1], block[4]);
360
        a->dsp.idct_put(dest_cr, a->picture.linesize[2], block[5]);
361
    }
362
}
363

    
364
static inline void dct_get(ASV1Context *a, int mb_x, int mb_y){
365
    DCTELEM (*block)[64]= a->block;
366
    int linesize= a->picture.linesize[0];
367
    int i;
368

    
369
    uint8_t *ptr_y  = a->picture.data[0] + (mb_y * 16* linesize              ) + mb_x * 16;
370
    uint8_t *ptr_cb = a->picture.data[1] + (mb_y * 8 * a->picture.linesize[1]) + mb_x * 8;
371
    uint8_t *ptr_cr = a->picture.data[2] + (mb_y * 8 * a->picture.linesize[2]) + mb_x * 8;
372

    
373
    a->dsp.get_pixels(block[0], ptr_y                 , linesize);
374
    a->dsp.get_pixels(block[1], ptr_y              + 8, linesize);
375
    a->dsp.get_pixels(block[2], ptr_y + 8*linesize    , linesize);
376
    a->dsp.get_pixels(block[3], ptr_y + 8*linesize + 8, linesize);
377
    for(i=0; i<4; i++)
378
        a->dsp.fdct(block[i]);
379

    
380
    if(!(a->avctx->flags&CODEC_FLAG_GRAY)){
381
        a->dsp.get_pixels(block[4], ptr_cb, a->picture.linesize[1]);
382
        a->dsp.get_pixels(block[5], ptr_cr, a->picture.linesize[2]);
383
        for(i=4; i<6; i++)
384
            a->dsp.fdct(block[i]);
385
    }
386
}
387

    
388
static int decode_frame(AVCodecContext *avctx,
389
                        void *data, int *data_size,
390
                        const uint8_t *buf, int buf_size)
391
{
392
    ASV1Context * const a = avctx->priv_data;
393
    AVFrame *picture = data;
394
    AVFrame * const p= (AVFrame*)&a->picture;
395
    int mb_x, mb_y;
396

    
397
    if(p->data[0])
398
        avctx->release_buffer(avctx, p);
399

    
400
    p->reference= 0;
401
    if(avctx->get_buffer(avctx, p) < 0){
402
        av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
403
        return -1;
404
    }
405
    p->pict_type= FF_I_TYPE;
406
    p->key_frame= 1;
407

    
408
    a->bitstream_buffer= av_fast_realloc(a->bitstream_buffer, &a->bitstream_buffer_size, buf_size + FF_INPUT_BUFFER_PADDING_SIZE);
409

    
410
    if(avctx->codec_id == CODEC_ID_ASV1)
411
        a->dsp.bswap_buf((uint32_t*)a->bitstream_buffer, (const uint32_t*)buf, buf_size/4);
412
    else{
413
        int i;
414
        for(i=0; i<buf_size; i++)
415
            a->bitstream_buffer[i]= ff_reverse[ buf[i] ];
416
    }
417

    
418
    init_get_bits(&a->gb, a->bitstream_buffer, buf_size*8);
419

    
420
    for(mb_y=0; mb_y<a->mb_height2; mb_y++){
421
        for(mb_x=0; mb_x<a->mb_width2; mb_x++){
422
            if( decode_mb(a, a->block) <0)
423
                return -1;
424

    
425
            idct_put(a, mb_x, mb_y);
426
        }
427
    }
428

    
429
    if(a->mb_width2 != a->mb_width){
430
        mb_x= a->mb_width2;
431
        for(mb_y=0; mb_y<a->mb_height2; mb_y++){
432
            if( decode_mb(a, a->block) <0)
433
                return -1;
434

    
435
            idct_put(a, mb_x, mb_y);
436
        }
437
    }
438

    
439
    if(a->mb_height2 != a->mb_height){
440
        mb_y= a->mb_height2;
441
        for(mb_x=0; mb_x<a->mb_width; mb_x++){
442
            if( decode_mb(a, a->block) <0)
443
                return -1;
444

    
445
            idct_put(a, mb_x, mb_y);
446
        }
447
    }
448
#if 0
449
int i;
450
printf("%d %d\n", 8*buf_size, get_bits_count(&a->gb));
451
for(i=get_bits_count(&a->gb); i<8*buf_size; i++){
452
    printf("%d", get_bits1(&a->gb));
453
}
454

455
for(i=0; i<s->avctx->extradata_size; i++){
456
    printf("%c\n", ((uint8_t*)s->avctx->extradata)[i]);
457
}
458
#endif
459

    
460
    *picture= *(AVFrame*)&a->picture;
461
    *data_size = sizeof(AVPicture);
462

    
463
    emms_c();
464

    
465
    return (get_bits_count(&a->gb)+31)/32*4;
466
}
467

    
468
#ifdef CONFIG_ENCODERS
469
static int encode_frame(AVCodecContext *avctx, unsigned char *buf, int buf_size, void *data){
470
    ASV1Context * const a = avctx->priv_data;
471
    AVFrame *pict = data;
472
    AVFrame * const p= (AVFrame*)&a->picture;
473
    int size;
474
    int mb_x, mb_y;
475

    
476
    init_put_bits(&a->pb, buf, buf_size);
477

    
478
    *p = *pict;
479
    p->pict_type= FF_I_TYPE;
480
    p->key_frame= 1;
481

    
482
    for(mb_y=0; mb_y<a->mb_height2; mb_y++){
483
        for(mb_x=0; mb_x<a->mb_width2; mb_x++){
484
            dct_get(a, mb_x, mb_y);
485
            encode_mb(a, a->block);
486
        }
487
    }
488

    
489
    if(a->mb_width2 != a->mb_width){
490
        mb_x= a->mb_width2;
491
        for(mb_y=0; mb_y<a->mb_height2; mb_y++){
492
            dct_get(a, mb_x, mb_y);
493
            encode_mb(a, a->block);
494
        }
495
    }
496

    
497
    if(a->mb_height2 != a->mb_height){
498
        mb_y= a->mb_height2;
499
        for(mb_x=0; mb_x<a->mb_width; mb_x++){
500
            dct_get(a, mb_x, mb_y);
501
            encode_mb(a, a->block);
502
        }
503
    }
504
    emms_c();
505

    
506
    align_put_bits(&a->pb);
507
    while(put_bits_count(&a->pb)&31)
508
        put_bits(&a->pb, 8, 0);
509

    
510
    size= put_bits_count(&a->pb)/32;
511

    
512
    if(avctx->codec_id == CODEC_ID_ASV1)
513
        a->dsp.bswap_buf((uint32_t*)buf, (uint32_t*)buf, size);
514
    else{
515
        int i;
516
        for(i=0; i<4*size; i++)
517
            buf[i]= ff_reverse[ buf[i] ];
518
    }
519

    
520
    return size*4;
521
}
522
#endif /* CONFIG_ENCODERS */
523

    
524
static void common_init(AVCodecContext *avctx){
525
    ASV1Context * const a = avctx->priv_data;
526

    
527
    dsputil_init(&a->dsp, avctx);
528

    
529
    a->mb_width   = (avctx->width  + 15) / 16;
530
    a->mb_height  = (avctx->height + 15) / 16;
531
    a->mb_width2  = (avctx->width  + 0) / 16;
532
    a->mb_height2 = (avctx->height + 0) / 16;
533

    
534
    avctx->coded_frame= (AVFrame*)&a->picture;
535
    a->avctx= avctx;
536
}
537

    
538
static int decode_init(AVCodecContext *avctx){
539
    ASV1Context * const a = avctx->priv_data;
540
    AVFrame *p= (AVFrame*)&a->picture;
541
    int i;
542
    const int scale= avctx->codec_id == CODEC_ID_ASV1 ? 1 : 2;
543

    
544
    common_init(avctx);
545
    init_vlcs(a);
546
    ff_init_scantable(a->dsp.idct_permutation, &a->scantable, scantab);
547
    avctx->pix_fmt= PIX_FMT_YUV420P;
548

    
549
    a->inv_qscale= ((uint8_t*)avctx->extradata)[0];
550
    if(a->inv_qscale == 0){
551
        av_log(avctx, AV_LOG_ERROR, "illegal qscale 0\n");
552
        if(avctx->codec_id == CODEC_ID_ASV1)
553
            a->inv_qscale= 6;
554
        else
555
            a->inv_qscale= 10;
556
    }
557

    
558
    for(i=0; i<64; i++){
559
        int index= scantab[i];
560

    
561
        a->intra_matrix[i]= 64*scale*ff_mpeg1_default_intra_matrix[index] / a->inv_qscale;
562
    }
563

    
564
    p->qstride= a->mb_width;
565
    p->qscale_table= av_malloc( p->qstride * a->mb_height);
566
    p->quality= (32*scale + a->inv_qscale/2)/a->inv_qscale;
567
    memset(p->qscale_table, p->quality, p->qstride*a->mb_height);
568

    
569
    return 0;
570
}
571

    
572
#ifdef CONFIG_ENCODERS
573
static int encode_init(AVCodecContext *avctx){
574
    ASV1Context * const a = avctx->priv_data;
575
    int i;
576
    const int scale= avctx->codec_id == CODEC_ID_ASV1 ? 1 : 2;
577

    
578
    common_init(avctx);
579

    
580
    if(avctx->global_quality == 0) avctx->global_quality= 4*FF_QUALITY_SCALE;
581

    
582
    a->inv_qscale= (32*scale*FF_QUALITY_SCALE +  avctx->global_quality/2) / avctx->global_quality;
583

    
584
    avctx->extradata= av_mallocz(8);
585
    avctx->extradata_size=8;
586
    ((uint32_t*)avctx->extradata)[0]= le2me_32(a->inv_qscale);
587
    ((uint32_t*)avctx->extradata)[1]= le2me_32(ff_get_fourcc("ASUS"));
588

    
589
    for(i=0; i<64; i++){
590
        int q= 32*scale*ff_mpeg1_default_intra_matrix[i];
591
        a->q_intra_matrix[i]= ((a->inv_qscale<<16) + q/2) / q;
592
    }
593

    
594
    return 0;
595
}
596
#endif
597

    
598
static int decode_end(AVCodecContext *avctx){
599
    ASV1Context * const a = avctx->priv_data;
600

    
601
    av_freep(&a->bitstream_buffer);
602
    av_freep(&a->picture.qscale_table);
603
    a->bitstream_buffer_size=0;
604

    
605
    return 0;
606
}
607

    
608
AVCodec asv1_decoder = {
609
    "asv1",
610
    CODEC_TYPE_VIDEO,
611
    CODEC_ID_ASV1,
612
    sizeof(ASV1Context),
613
    decode_init,
614
    NULL,
615
    decode_end,
616
    decode_frame,
617
    CODEC_CAP_DR1,
618
};
619

    
620
AVCodec asv2_decoder = {
621
    "asv2",
622
    CODEC_TYPE_VIDEO,
623
    CODEC_ID_ASV2,
624
    sizeof(ASV1Context),
625
    decode_init,
626
    NULL,
627
    decode_end,
628
    decode_frame,
629
    CODEC_CAP_DR1,
630
};
631

    
632
#ifdef CONFIG_ENCODERS
633

    
634
AVCodec asv1_encoder = {
635
    "asv1",
636
    CODEC_TYPE_VIDEO,
637
    CODEC_ID_ASV1,
638
    sizeof(ASV1Context),
639
    encode_init,
640
    encode_frame,
641
    //encode_end,
642
    .pix_fmts= (enum PixelFormat[]){PIX_FMT_YUV420P, -1},
643
};
644

    
645
AVCodec asv2_encoder = {
646
    "asv2",
647
    CODEC_TYPE_VIDEO,
648
    CODEC_ID_ASV2,
649
    sizeof(ASV1Context),
650
    encode_init,
651
    encode_frame,
652
    //encode_end,
653
    .pix_fmts= (enum PixelFormat[]){PIX_FMT_YUV420P, -1},
654
};
655

    
656
#endif //CONFIG_ENCODERS