libavcodec/asv1.c

   1 /*
   2  * ASUS V1/V2 codec
   3  * Copyright (c) 2003 Michael Niedermayer
   4  *
   5  * This library is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU Lesser General Public
   7  * License as published by the Free Software Foundation; either
   8  * version 2 of the License, or (at your option) any later version.
   9  *
  10  * This library is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * Lesser General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU Lesser General Public
  16  * License along with this library; if not, write to the Free Software
  17  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  18  */
  19
  20 /**
  21  * @file asv1.c
  22  * ASUS V1/V2 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 6
  33 #define ASV2_LEVEL_VLC_BITS 10
  34
  35 typedef struct ASV1Context{
  36     AVCodecContext *avctx;
  37     DSPContext dsp;
  38     AVFrame picture;
  39     PutBitContext pb;
  40     GetBitContext gb;
  41     ScanTable scantable;
  42     int inv_qscale;
  43     int mb_width;
  44     int mb_height;
  45     int mb_width2;
  46     int mb_height2;
  47     DECLARE_ALIGNED_8(DCTELEM, block[6][64]);
  48     DECLARE_ALIGNED_8(uint16_t, intra_matrix[64]);
  49     DECLARE_ALIGNED_8(int, q_intra_matrix[64]);
  50     uint8_t *bitstream_buffer;
  51     unsigned int bitstream_buffer_size;
  52 } ASV1Context;
  53
  54 static const uint8_t scantab[64]={
  55     0x00,0x08,0x01,0x09,0x10,0x18,0x11,0x19,
  56     0x02,0x0A,0x03,0x0B,0x12,0x1A,0x13,0x1B,
  57     0x04,0x0C,0x05,0x0D,0x20,0x28,0x21,0x29,
  58     0x06,0x0E,0x07,0x0F,0x14,0x1C,0x15,0x1D,
  59     0x22,0x2A,0x23,0x2B,0x30,0x38,0x31,0x39,
  60     0x16,0x1E,0x17,0x1F,0x24,0x2C,0x25,0x2D,
  61     0x32,0x3A,0x33,0x3B,0x26,0x2E,0x27,0x2F,
  62     0x34,0x3C,0x35,0x3D,0x36,0x3E,0x37,0x3F,
  63 };
  64
  65
  66 static const uint8_t ccp_tab[17][2]={
  67     {0x2,2}, {0x7,5}, {0xB,5}, {0x3,5},
  68     {0xD,5}, {0x5,5}, {0x9,5}, {0x1,5},
  69     {0xE,5}, {0x6,5}, {0xA,5}, {0x2,5},
  70     {0xC,5}, {0x4,5}, {0x8,5}, {0x3,2},
  71     {0xF,5}, //EOB
  72 };
  73
  74 static const uint8_t level_tab[7][2]={
  75     {3,4}, {3,3}, {3,2}, {0,3}, {2,2}, {2,3}, {2,4}
  76 };
  77
  78 static const uint8_t dc_ccp_tab[8][2]={
  79     {0x1,2}, {0xD,4}, {0xF,4}, {0xC,4},
  80     {0x5,3}, {0xE,4}, {0x4,3}, {0x0,2},
  81 };
  82
  83 static const uint8_t ac_ccp_tab[16][2]={
  84     {0x00,2}, {0x3B,6}, {0x0A,4}, {0x3A,6},
  85     {0x02,3}, {0x39,6}, {0x3C,6}, {0x38,6},
  86     {0x03,3}, {0x3D,6}, {0x08,4}, {0x1F,5},
  87     {0x09,4}, {0x0B,4}, {0x0D,4}, {0x0C,4},
  88 };
  89
  90 static const uint8_t asv2_level_tab[63][2]={
  91     {0x3F,10},{0x2F,10},{0x37,10},{0x27,10},{0x3B,10},{0x2B,10},{0x33,10},{0x23,10},
  92     {0x3D,10},{0x2D,10},{0x35,10},{0x25,10},{0x39,10},{0x29,10},{0x31,10},{0x21,10},
  93     {0x1F, 8},{0x17, 8},{0x1B, 8},{0x13, 8},{0x1D, 8},{0x15, 8},{0x19, 8},{0x11, 8},
  94     {0x0F, 6},{0x0B, 6},{0x0D, 6},{0x09, 6},
  95     {0x07, 4},{0x05, 4},
  96     {0x03, 2},
  97     {0x00, 5},
  98     {0x02, 2},
  99     {0x04, 4},{0x06, 4},
 100     {0x08, 6},{0x0C, 6},{0x0A, 6},{0x0E, 6},
 101     {0x10, 8},{0x18, 8},{0x14, 8},{0x1C, 8},{0x12, 8},{0x1A, 8},{0x16, 8},{0x1E, 8},
 102     {0x20,10},{0x30,10},{0x28,10},{0x38,10},{0x24,10},{0x34,10},{0x2C,10},{0x3C,10},
 103     {0x22,10},{0x32,10},{0x2A,10},{0x3A,10},{0x26,10},{0x36,10},{0x2E,10},{0x3E,10},
 104 };
 105
 106
 107 static VLC ccp_vlc;
 108 static VLC level_vlc;
 109 static VLC dc_ccp_vlc;
 110 static VLC ac_ccp_vlc;
 111 static VLC asv2_level_vlc;
 112
 113 static void init_vlcs(ASV1Context *a){
 114     static int done = 0;
 115
 116     if (!done) {
 117         done = 1;
 118
 119         init_vlc(&ccp_vlc, VLC_BITS, 17,
 120                  &ccp_tab[0][1], 2, 1,
 121                  &ccp_tab[0][0], 2, 1, 1);
 122         init_vlc(&dc_ccp_vlc, VLC_BITS, 8,
 123                  &dc_ccp_tab[0][1], 2, 1,
 124                  &dc_ccp_tab[0][0], 2, 1, 1);
 125         init_vlc(&ac_ccp_vlc, VLC_BITS, 16,
 126                  &ac_ccp_tab[0][1], 2, 1,
 127                  &ac_ccp_tab[0][0], 2, 1, 1);
 128         init_vlc(&level_vlc,  VLC_BITS, 7,
 129                  &level_tab[0][1], 2, 1,
 130                  &level_tab[0][0], 2, 1, 1);
 131         init_vlc(&asv2_level_vlc, ASV2_LEVEL_VLC_BITS, 63,
 132                  &asv2_level_tab[0][1], 2, 1,
 133                  &asv2_level_tab[0][0], 2, 1, 1);
 134     }
 135 }
 136
 137 //FIXME write a reversed bitstream reader to avoid the double reverse
 138 static inline int asv2_get_bits(GetBitContext *gb, int n){
 139     return ff_reverse[ get_bits(gb, n) << (8-n) ];
 140 }
 141
 142 static inline void asv2_put_bits(PutBitContext *pb, int n, int v){
 143     put_bits(pb, n, ff_reverse[ v << (8-n) ]);
 144 }
 145
 146 static inline int asv1_get_level(GetBitContext *gb){
 147     int code= get_vlc2(gb, level_vlc.table, VLC_BITS, 1);
 148
 149     if(code==3) return get_sbits(gb, 8);
 150     else        return code - 3;
 151 }
 152
 153 static inline int asv2_get_level(GetBitContext *gb){
 154     int code= get_vlc2(gb, asv2_level_vlc.table, ASV2_LEVEL_VLC_BITS, 1);
 155
 156     if(code==31) return (int8_t)asv2_get_bits(gb, 8);
 157     else         return code - 31;
 158 }
 159
 160 static inline void asv1_put_level(PutBitContext *pb, int level){
 161     unsigned int index= level + 3;
 162
 163     if(index <= 6) put_bits(pb, level_tab[index][1], level_tab[index][0]);
 164     else{
 165         put_bits(pb, level_tab[3][1], level_tab[3][0]);
 166         put_bits(pb, 8, level&0xFF);
 167     }
 168 }
 169
 170 static inline void asv2_put_level(PutBitContext *pb, int level){
 171     unsigned int index= level + 31;
 172
 173     if(index <= 62) put_bits(pb, asv2_level_tab[index][1], asv2_level_tab[index][0]);
 174     else{
 175         put_bits(pb, asv2_level_tab[31][1], asv2_level_tab[31][0]);
 176         asv2_put_bits(pb, 8, level&0xFF);
 177     }
 178 }
 179
 180 static inline int asv1_decode_block(ASV1Context *a, DCTELEM block[64]){
 181     int i;
 182
 183     block[0]= 8*get_bits(&a->gb, 8);
 184
 185     for(i=0; i<11; i++){
 186         const int ccp= get_vlc2(&a->gb, ccp_vlc.table, VLC_BITS, 1);
 187
 188         if(ccp){
 189             if(ccp == 16) break;
 190             if(ccp < 0 || i>=10){
 191                 av_log(a->avctx, AV_LOG_ERROR, "coded coeff pattern damaged\n");
 192                 return -1;
 193             }
 194
 195             if(ccp&8) block[a->scantable.permutated[4*i+0]]= (asv1_get_level(&a->gb) * a->intra_matrix[4*i+0])>>4;
 196             if(ccp&4) block[a->scantable.permutated[4*i+1]]= (asv1_get_level(&a->gb) * a->intra_matrix[4*i+1])>>4;
 197             if(ccp&2) block[a->scantable.permutated[4*i+2]]= (asv1_get_level(&a->gb) * a->intra_matrix[4*i+2])>>4;
 198             if(ccp&1) block[a->scantable.permutated[4*i+3]]= (asv1_get_level(&a->gb) * a->intra_matrix[4*i+3])>>4;
 199         }
 200     }
 201
 202     return 0;
 203 }
 204
 205 static inline int asv2_decode_block(ASV1Context *a, DCTELEM block[64]){
 206     int i, count, ccp;
 207
 208     count= asv2_get_bits(&a->gb, 4);
 209
 210     block[0]= 8*asv2_get_bits(&a->gb, 8);
 211
 212     ccp= get_vlc2(&a->gb, dc_ccp_vlc.table, VLC_BITS, 1);
 213     if(ccp){
 214         if(ccp&4) block[a->scantable.permutated[1]]= (asv2_get_level(&a->gb) * a->intra_matrix[1])>>4;
 215         if(ccp&2) block[a->scantable.permutated[2]]= (asv2_get_level(&a->gb) * a->intra_matrix[2])>>4;
 216         if(ccp&1) block[a->scantable.permutated[3]]= (asv2_get_level(&a->gb) * a->intra_matrix[3])>>4;
 217     }
 218
 219     for(i=1; i<count+1; i++){
 220         const int ccp= get_vlc2(&a->gb, ac_ccp_vlc.table, VLC_BITS, 1);
 221
 222         if(ccp){
 223             if(ccp&8) block[a->scantable.permutated[4*i+0]]= (asv2_get_level(&a->gb) * a->intra_matrix[4*i+0])>>4;
 224             if(ccp&4) block[a->scantable.permutated[4*i+1]]= (asv2_get_level(&a->gb) * a->intra_matrix[4*i+1])>>4;
 225             if(ccp&2) block[a->scantable.permutated[4*i+2]]= (asv2_get_level(&a->gb) * a->intra_matrix[4*i+2])>>4;
 226             if(ccp&1) block[a->scantable.permutated[4*i+3]]= (asv2_get_level(&a->gb) * a->intra_matrix[4*i+3])>>4;
 227         }
 228     }
 229
 230     return 0;
 231 }
 232
 233 static inline void asv1_encode_block(ASV1Context *a, DCTELEM block[64]){
 234     int i;
 235     int nc_count=0;
 236
 237     put_bits(&a->pb, 8, (block[0] + 32)>>6);
 238     block[0]= 0;
 239
 240     for(i=0; i<10; i++){
 241         const int index= scantab[4*i];
 242         int ccp=0;
 243
 244         if( (block[index + 0] = (block[index + 0]*a->q_intra_matrix[index + 0] + (1<<15))>>16) ) ccp |= 8;
 245         if( (block[index + 8] = (block[index + 8]*a->q_intra_matrix[index + 8] + (1<<15))>>16) ) ccp |= 4;
 246         if( (block[index + 1] = (block[index + 1]*a->q_intra_matrix[index + 1] + (1<<15))>>16) ) ccp |= 2;
 247         if( (block[index + 9] = (block[index + 9]*a->q_intra_matrix[index + 9] + (1<<15))>>16) ) ccp |= 1;
 248
 249         if(ccp){
 250             for(;nc_count; nc_count--)
 251                 put_bits(&a->pb, ccp_tab[0][1], ccp_tab[0][0]);
 252
 253             put_bits(&a->pb, ccp_tab[ccp][1], ccp_tab[ccp][0]);
 254
 255             if(ccp&8) asv1_put_level(&a->pb, block[index + 0]);
 256             if(ccp&4) asv1_put_level(&a->pb, block[index + 8]);
 257             if(ccp&2) asv1_put_level(&a->pb, block[index + 1]);
 258             if(ccp&1) asv1_put_level(&a->pb, block[index + 9]);
 259         }else{
 260             nc_count++;
 261         }
 262     }
 263     put_bits(&a->pb, ccp_tab[16][1], ccp_tab[16][0]);
 264 }
 265
 266 static inline void asv2_encode_block(ASV1Context *a, DCTELEM block[64]){
 267     int i;
 268     int count=0;
 269
 270     for(count=63; count>3; count--){
 271         const int index= scantab[count];
 272
 273         if( (block[index]*a->q_intra_matrix[index] + (1<<15))>>16 )
 274             break;
 275     }
 276
 277     count >>= 2;
 278
 279     asv2_put_bits(&a->pb, 4, count);
 280     asv2_put_bits(&a->pb, 8, (block[0] + 32)>>6);
 281     block[0]= 0;
 282
 283     for(i=0; i<=count; i++){
 284         const int index= scantab[4*i];
 285         int ccp=0;
 286
 287         if( (block[index + 0] = (block[index + 0]*a->q_intra_matrix[index + 0] + (1<<15))>>16) ) ccp |= 8;
 288         if( (block[index + 8] = (block[index + 8]*a->q_intra_matrix[index + 8] + (1<<15))>>16) ) ccp |= 4;
 289         if( (block[index + 1] = (block[index + 1]*a->q_intra_matrix[index + 1] + (1<<15))>>16) ) ccp |= 2;
 290         if( (block[index + 9] = (block[index + 9]*a->q_intra_matrix[index + 9] + (1<<15))>>16) ) ccp |= 1;
 291
 292         assert(i || ccp<8);
 293         if(i) put_bits(&a->pb, ac_ccp_tab[ccp][1], ac_ccp_tab[ccp][0]);
 294         else  put_bits(&a->pb, dc_ccp_tab[ccp][1], dc_ccp_tab[ccp][0]);
 295
 296         if(ccp){
 297             if(ccp&8) asv2_put_level(&a->pb, block[index + 0]);
 298             if(ccp&4) asv2_put_level(&a->pb, block[index + 8]);
 299             if(ccp&2) asv2_put_level(&a->pb, block[index + 1]);
 300             if(ccp&1) asv2_put_level(&a->pb, block[index + 9]);
 301         }
 302     }
 303 }
 304
 305 static inline int decode_mb(ASV1Context *a, DCTELEM block[6][64]){
 306     int i;
 307
 308     a->dsp.clear_blocks(block[0]);
 309
 310     if(a->avctx->codec_id == CODEC_ID_ASV1){
 311         for(i=0; i<6; i++){
 312             if( asv1_decode_block(a, block[i]) < 0)
 313                 return -1;
 314         }
 315     }else{
 316         for(i=0; i<6; i++){
 317             if( asv2_decode_block(a, block[i]) < 0)
 318                 return -1;
 319         }
 320     }
 321     return 0;
 322 }
 323
 324 static inline int encode_mb(ASV1Context *a, DCTELEM block[6][64]){
 325     int i;
 326
 327     if(a->pb.buf_end - a->pb.buf - (put_bits_count(&a->pb)>>3) < 30*16*16*3/2/8){
 328         av_log(a->avctx, AV_LOG_ERROR, "encoded frame too large\n");
 329         return -1;
 330     }
 331
 332     if(a->avctx->codec_id == CODEC_ID_ASV1){
 333         for(i=0; i<6; i++)
 334             asv1_encode_block(a, block[i]);
 335     }else{
 336         for(i=0; i<6; i++)
 337             asv2_encode_block(a, block[i]);
 338     }
 339     return 0;
 340 }
 341
 342 static inline void idct_put(ASV1Context *a, int mb_x, int mb_y){
 343     DCTELEM (*block)[64]= a->block;
 344     int linesize= a->picture.linesize[0];
 345
 346     uint8_t *dest_y  = a->picture.data[0] + (mb_y * 16* linesize              ) + mb_x * 16;
 347     uint8_t *dest_cb = a->picture.data[1] + (mb_y * 8 * a->picture.linesize[1]) + mb_x * 8;
 348     uint8_t *dest_cr = a->picture.data[2] + (mb_y * 8 * a->picture.linesize[2]) + mb_x * 8;
 349
 350     a->dsp.idct_put(dest_y                 , linesize, block[0]);
 351     a->dsp.idct_put(dest_y              + 8, linesize, block[1]);
 352     a->dsp.idct_put(dest_y + 8*linesize    , linesize, block[2]);
 353     a->dsp.idct_put(dest_y + 8*linesize + 8, linesize, block[3]);
 354
 355     if(!(a->avctx->flags&CODEC_FLAG_GRAY)){
 356         a->dsp.idct_put(dest_cb, a->picture.linesize[1], block[4]);
 357         a->dsp.idct_put(dest_cr, a->picture.linesize[2], block[5]);
 358     }
 359 }
 360
 361 static inline void dct_get(ASV1Context *a, int mb_x, int mb_y){
 362     DCTELEM (*block)[64]= a->block;
 363     int linesize= a->picture.linesize[0];
 364     int i;
 365
 366     uint8_t *ptr_y  = a->picture.data[0] + (mb_y * 16* linesize              ) + mb_x * 16;
 367     uint8_t *ptr_cb = a->picture.data[1] + (mb_y * 8 * a->picture.linesize[1]) + mb_x * 8;
 368     uint8_t *ptr_cr = a->picture.data[2] + (mb_y * 8 * a->picture.linesize[2]) + mb_x * 8;
 369
 370     a->dsp.get_pixels(block[0], ptr_y                 , linesize);
 371     a->dsp.get_pixels(block[1], ptr_y              + 8, linesize);
 372     a->dsp.get_pixels(block[2], ptr_y + 8*linesize    , linesize);
 373     a->dsp.get_pixels(block[3], ptr_y + 8*linesize + 8, linesize);
 374     for(i=0; i<4; i++)
 375         a->dsp.fdct(block[i]);
 376
 377     if(!(a->avctx->flags&CODEC_FLAG_GRAY)){
 378         a->dsp.get_pixels(block[4], ptr_cb, a->picture.linesize[1]);
 379         a->dsp.get_pixels(block[5], ptr_cr, a->picture.linesize[2]);
 380         for(i=4; i<6; i++)
 381             a->dsp.fdct(block[i]);
 382     }
 383 }
 384
 385 static int decode_frame(AVCodecContext *avctx,
 386                         void *data, int *data_size,
 387                         uint8_t *buf, int buf_size)
 388 {
 389     ASV1Context * const a = avctx->priv_data;
 390     AVFrame *picture = data;
 391     AVFrame * const p= (AVFrame*)&a->picture;
 392     int mb_x, mb_y;
 393
 394     if(p->data[0])
 395         avctx->release_buffer(avctx, p);
 396
 397     p->reference= 0;
 398     if(avctx->get_buffer(avctx, p) < 0){
 399         av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
 400         return -1;
 401     }
 402     p->pict_type= I_TYPE;
 403     p->key_frame= 1;
 404
 405     a->bitstream_buffer= av_fast_realloc(a->bitstream_buffer, &a->bitstream_buffer_size, buf_size + FF_INPUT_BUFFER_PADDING_SIZE);
 406
 407     if(avctx->codec_id == CODEC_ID_ASV1)
 408         a->dsp.bswap_buf((uint32_t*)a->bitstream_buffer, (uint32_t*)buf, buf_size/4);
 409     else{
 410         int i;
 411         for(i=0; i<buf_size; i++)
 412             a->bitstream_buffer[i]= ff_reverse[ buf[i] ];
 413     }
 414
 415     init_get_bits(&a->gb, a->bitstream_buffer, buf_size*8);
 416
 417     for(mb_y=0; mb_y<a->mb_height2; mb_y++){
 418         for(mb_x=0; mb_x<a->mb_width2; mb_x++){
 419             if( decode_mb(a, a->block) <0)
 420                 return -1;
 421
 422             idct_put(a, mb_x, mb_y);
 423         }
 424     }
 425
 426     if(a->mb_width2 != a->mb_width){
 427         mb_x= a->mb_width2;
 428         for(mb_y=0; mb_y<a->mb_height2; mb_y++){
 429             if( decode_mb(a, a->block) <0)
 430                 return -1;
 431
 432             idct_put(a, mb_x, mb_y);
 433         }
 434     }
 435
 436     if(a->mb_height2 != a->mb_height){
 437         mb_y= a->mb_height2;
 438         for(mb_x=0; mb_x<a->mb_width; mb_x++){
 439             if( decode_mb(a, a->block) <0)
 440                 return -1;
 441
 442             idct_put(a, mb_x, mb_y);
 443         }
 444     }
 445 #if 0
 446 int i;
 447 printf("%d %d\n", 8*buf_size, get_bits_count(&a->gb));
 448 for(i=get_bits_count(&a->gb); i<8*buf_size; i++){
 449     printf("%d", get_bits1(&a->gb));
 450 }
 451
 452 for(i=0; i<s->avctx->extradata_size; i++){
 453     printf("%c\n", ((uint8_t*)s->avctx->extradata)[i]);
 454 }
 455 #endif
 456
 457     *picture= *(AVFrame*)&a->picture;
 458     *data_size = sizeof(AVPicture);
 459
 460     emms_c();
 461
 462     return (get_bits_count(&a->gb)+31)/32*4;
 463 }
 464
 465 static int encode_frame(AVCodecContext *avctx, unsigned char *buf, int buf_size, void *data){
 466     ASV1Context * const a = avctx->priv_data;
 467     AVFrame *pict = data;
 468     AVFrame * const p= (AVFrame*)&a->picture;
 469     int size;
 470     int mb_x, mb_y;
 471
 472     init_put_bits(&a->pb, buf, buf_size);
 473
 474     *p = *pict;
 475     p->pict_type= I_TYPE;
 476     p->key_frame= 1;
 477
 478     for(mb_y=0; mb_y<a->mb_height2; mb_y++){
 479         for(mb_x=0; mb_x<a->mb_width2; mb_x++){
 480             dct_get(a, mb_x, mb_y);
 481             encode_mb(a, a->block);
 482         }
 483     }
 484
 485     if(a->mb_width2 != a->mb_width){
 486         mb_x= a->mb_width2;
 487         for(mb_y=0; mb_y<a->mb_height2; mb_y++){
 488             dct_get(a, mb_x, mb_y);
 489             encode_mb(a, a->block);
 490         }
 491     }
 492
 493     if(a->mb_height2 != a->mb_height){
 494         mb_y= a->mb_height2;
 495         for(mb_x=0; mb_x<a->mb_width; mb_x++){
 496             dct_get(a, mb_x, mb_y);
 497             encode_mb(a, a->block);
 498         }
 499     }
 500     emms_c();
 501
 502     align_put_bits(&a->pb);
 503     while(put_bits_count(&a->pb)&31)
 504         put_bits(&a->pb, 8, 0);
 505
 506     size= put_bits_count(&a->pb)/32;
 507
 508     if(avctx->codec_id == CODEC_ID_ASV1)
 509         a->dsp.bswap_buf((uint32_t*)buf, (uint32_t*)buf, size);
 510     else{
 511         int i;
 512         for(i=0; i<4*size; i++)
 513             buf[i]= ff_reverse[ buf[i] ];
 514     }
 515
 516     return size*4;
 517 }
 518
 519 static void common_init(AVCodecContext *avctx){
 520     ASV1Context * const a = avctx->priv_data;
 521
 522     dsputil_init(&a->dsp, avctx);
 523
 524     a->mb_width   = (avctx->width  + 15) / 16;
 525     a->mb_height  = (avctx->height + 15) / 16;
 526     a->mb_width2  = (avctx->width  + 0) / 16;
 527     a->mb_height2 = (avctx->height + 0) / 16;
 528
 529     avctx->coded_frame= (AVFrame*)&a->picture;
 530     a->avctx= avctx;
 531 }
 532
 533 static int decode_init(AVCodecContext *avctx){
 534     ASV1Context * const a = avctx->priv_data;
 535     AVFrame *p= (AVFrame*)&a->picture;
 536     int i;
 537     const int scale= avctx->codec_id == CODEC_ID_ASV1 ? 1 : 2;
 538
 539     common_init(avctx);
 540     init_vlcs(a);
 541     ff_init_scantable(a->dsp.idct_permutation, &a->scantable, scantab);
 542     avctx->pix_fmt= PIX_FMT_YUV420P;
 543
 544     a->inv_qscale= ((uint8_t*)avctx->extradata)[0];
 545     if(a->inv_qscale == 0){
 546         av_log(avctx, AV_LOG_ERROR, "illegal qscale 0\n");
 547         if(avctx->codec_id == CODEC_ID_ASV1)
 548             a->inv_qscale= 6;
 549         else
 550             a->inv_qscale= 10;
 551     }
 552
 553     for(i=0; i<64; i++){
 554         int index= scantab[i];
 555
 556         a->intra_matrix[i]= 64*scale*ff_mpeg1_default_intra_matrix[index] / a->inv_qscale;
 557     }
 558
 559     p->qstride= a->mb_width;
 560     p->qscale_table= av_malloc( p->qstride * a->mb_height);
 561     p->quality= (32*scale + a->inv_qscale/2)/a->inv_qscale;
 562     memset(p->qscale_table, p->quality, p->qstride*a->mb_height);
 563
 564     return 0;
 565 }
 566
 567 static int encode_init(AVCodecContext *avctx){
 568     ASV1Context * const a = avctx->priv_data;
 569     int i;
 570     const int scale= avctx->codec_id == CODEC_ID_ASV1 ? 1 : 2;
 571
 572     common_init(avctx);
 573
 574     if(avctx->global_quality == 0) avctx->global_quality= 4*FF_QUALITY_SCALE;
 575
 576     a->inv_qscale= (32*scale*FF_QUALITY_SCALE +  avctx->global_quality/2) / avctx->global_quality;
 577
 578     avctx->extradata= av_mallocz(8);
 579     avctx->extradata_size=8;
 580     ((uint32_t*)avctx->extradata)[0]= le2me_32(a->inv_qscale);
 581     ((uint32_t*)avctx->extradata)[1]= le2me_32(ff_get_fourcc("ASUS"));
 582
 583     for(i=0; i<64; i++){
 584         int q= 32*scale*ff_mpeg1_default_intra_matrix[i];
 585         a->q_intra_matrix[i]= ((a->inv_qscale<<16) + q/2) / q;
 586     }
 587
 588     return 0;
 589 }
 590
 591 static int decode_end(AVCodecContext *avctx){
 592     ASV1Context * const a = avctx->priv_data;
 593
 594     av_freep(&a->bitstream_buffer);
 595     av_freep(&a->picture.qscale_table);
 596     a->bitstream_buffer_size=0;
 597
 598     return 0;
 599 }
 600
 601 AVCodec asv1_decoder = {
 602     "asv1",
 603     CODEC_TYPE_VIDEO,
 604     CODEC_ID_ASV1,
 605     sizeof(ASV1Context),
 606     decode_init,
 607     NULL,
 608     decode_end,
 609     decode_frame,
 610     CODEC_CAP_DR1,
 611 };
 612
 613 AVCodec asv2_decoder = {
 614     "asv2",
 615     CODEC_TYPE_VIDEO,
 616     CODEC_ID_ASV2,
 617     sizeof(ASV1Context),
 618     decode_init,
 619     NULL,
 620     decode_end,
 621     decode_frame,
 622     CODEC_CAP_DR1,
 623 };
 624
 625 #ifdef CONFIG_ENCODERS
 626
 627 AVCodec asv1_encoder = {
 628     "asv1",
 629     CODEC_TYPE_VIDEO,
 630     CODEC_ID_ASV1,
 631     sizeof(ASV1Context),
 632     encode_init,
 633     encode_frame,
 634     //encode_end,
 635 };
 636
 637 AVCodec asv2_encoder = {
 638     "asv2",
 639     CODEC_TYPE_VIDEO,
 640     CODEC_ID_ASV2,
 641     sizeof(ASV1Context),
 642     encode_init,
 643     encode_frame,
 644     //encode_end,
 645 };
 646
 647 #endif //CONFIG_ENCODERS