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libavcodec/asv1.c

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00001 /*
00002  * ASUS V1/V2 codec
00003  * Copyright (c) 2003 Michael Niedermayer
00004  *
00005  * This file is part of Libav.
00006  *
00007  * Libav is free software; you can redistribute it and/or
00008  * modify it under the terms of the GNU Lesser General Public
00009  * License as published by the Free Software Foundation; either
00010  * version 2.1 of the License, or (at your option) any later version.
00011  *
00012  * Libav is distributed in the hope that it will be useful,
00013  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00014  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00015  * Lesser General Public License for more details.
00016  *
00017  * You should have received a copy of the GNU Lesser General Public
00018  * License along with Libav; if not, write to the Free Software
00019  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
00020  */
00021 
00027 #include "avcodec.h"
00028 #include "libavutil/common.h"
00029 #include "put_bits.h"
00030 #include "dsputil.h"
00031 #include "mpeg12data.h"
00032 
00033 //#undef NDEBUG
00034 //#include <assert.h>
00035 
00036 #define VLC_BITS 6
00037 #define ASV2_LEVEL_VLC_BITS 10
00038 
00039 typedef struct ASV1Context{
00040     AVCodecContext *avctx;
00041     DSPContext dsp;
00042     AVFrame picture;
00043     PutBitContext pb;
00044     GetBitContext gb;
00045     ScanTable scantable;
00046     int inv_qscale;
00047     int mb_width;
00048     int mb_height;
00049     int mb_width2;
00050     int mb_height2;
00051     DECLARE_ALIGNED(16, DCTELEM, block)[6][64];
00052     uint16_t intra_matrix[64];
00053     int q_intra_matrix[64];
00054     uint8_t *bitstream_buffer;
00055     unsigned int bitstream_buffer_size;
00056 } ASV1Context;
00057 
00058 static const uint8_t scantab[64]={
00059     0x00,0x08,0x01,0x09,0x10,0x18,0x11,0x19,
00060     0x02,0x0A,0x03,0x0B,0x12,0x1A,0x13,0x1B,
00061     0x04,0x0C,0x05,0x0D,0x20,0x28,0x21,0x29,
00062     0x06,0x0E,0x07,0x0F,0x14,0x1C,0x15,0x1D,
00063     0x22,0x2A,0x23,0x2B,0x30,0x38,0x31,0x39,
00064     0x16,0x1E,0x17,0x1F,0x24,0x2C,0x25,0x2D,
00065     0x32,0x3A,0x33,0x3B,0x26,0x2E,0x27,0x2F,
00066     0x34,0x3C,0x35,0x3D,0x36,0x3E,0x37,0x3F,
00067 };
00068 
00069 
00070 static const uint8_t ccp_tab[17][2]={
00071     {0x2,2}, {0x7,5}, {0xB,5}, {0x3,5},
00072     {0xD,5}, {0x5,5}, {0x9,5}, {0x1,5},
00073     {0xE,5}, {0x6,5}, {0xA,5}, {0x2,5},
00074     {0xC,5}, {0x4,5}, {0x8,5}, {0x3,2},
00075     {0xF,5}, //EOB
00076 };
00077 
00078 static const uint8_t level_tab[7][2]={
00079     {3,4}, {3,3}, {3,2}, {0,3}, {2,2}, {2,3}, {2,4}
00080 };
00081 
00082 static const uint8_t dc_ccp_tab[8][2]={
00083     {0x1,2}, {0xD,4}, {0xF,4}, {0xC,4},
00084     {0x5,3}, {0xE,4}, {0x4,3}, {0x0,2},
00085 };
00086 
00087 static const uint8_t ac_ccp_tab[16][2]={
00088     {0x00,2}, {0x3B,6}, {0x0A,4}, {0x3A,6},
00089     {0x02,3}, {0x39,6}, {0x3C,6}, {0x38,6},
00090     {0x03,3}, {0x3D,6}, {0x08,4}, {0x1F,5},
00091     {0x09,4}, {0x0B,4}, {0x0D,4}, {0x0C,4},
00092 };
00093 
00094 static const uint8_t asv2_level_tab[63][2]={
00095     {0x3F,10},{0x2F,10},{0x37,10},{0x27,10},{0x3B,10},{0x2B,10},{0x33,10},{0x23,10},
00096     {0x3D,10},{0x2D,10},{0x35,10},{0x25,10},{0x39,10},{0x29,10},{0x31,10},{0x21,10},
00097     {0x1F, 8},{0x17, 8},{0x1B, 8},{0x13, 8},{0x1D, 8},{0x15, 8},{0x19, 8},{0x11, 8},
00098     {0x0F, 6},{0x0B, 6},{0x0D, 6},{0x09, 6},
00099     {0x07, 4},{0x05, 4},
00100     {0x03, 2},
00101     {0x00, 5},
00102     {0x02, 2},
00103     {0x04, 4},{0x06, 4},
00104     {0x08, 6},{0x0C, 6},{0x0A, 6},{0x0E, 6},
00105     {0x10, 8},{0x18, 8},{0x14, 8},{0x1C, 8},{0x12, 8},{0x1A, 8},{0x16, 8},{0x1E, 8},
00106     {0x20,10},{0x30,10},{0x28,10},{0x38,10},{0x24,10},{0x34,10},{0x2C,10},{0x3C,10},
00107     {0x22,10},{0x32,10},{0x2A,10},{0x3A,10},{0x26,10},{0x36,10},{0x2E,10},{0x3E,10},
00108 };
00109 
00110 
00111 static VLC ccp_vlc;
00112 static VLC level_vlc;
00113 static VLC dc_ccp_vlc;
00114 static VLC ac_ccp_vlc;
00115 static VLC asv2_level_vlc;
00116 
00117 static av_cold void init_vlcs(ASV1Context *a){
00118     static int done = 0;
00119 
00120     if (!done) {
00121         done = 1;
00122 
00123         INIT_VLC_STATIC(&ccp_vlc, VLC_BITS, 17,
00124                  &ccp_tab[0][1], 2, 1,
00125                  &ccp_tab[0][0], 2, 1, 64);
00126         INIT_VLC_STATIC(&dc_ccp_vlc, VLC_BITS, 8,
00127                  &dc_ccp_tab[0][1], 2, 1,
00128                  &dc_ccp_tab[0][0], 2, 1, 64);
00129         INIT_VLC_STATIC(&ac_ccp_vlc, VLC_BITS, 16,
00130                  &ac_ccp_tab[0][1], 2, 1,
00131                  &ac_ccp_tab[0][0], 2, 1, 64);
00132         INIT_VLC_STATIC(&level_vlc,  VLC_BITS, 7,
00133                  &level_tab[0][1], 2, 1,
00134                  &level_tab[0][0], 2, 1, 64);
00135         INIT_VLC_STATIC(&asv2_level_vlc, ASV2_LEVEL_VLC_BITS, 63,
00136                  &asv2_level_tab[0][1], 2, 1,
00137                  &asv2_level_tab[0][0], 2, 1, 1024);
00138     }
00139 }
00140 
00141 //FIXME write a reversed bitstream reader to avoid the double reverse
00142 static inline int asv2_get_bits(GetBitContext *gb, int n){
00143     return av_reverse[ get_bits(gb, n) << (8-n) ];
00144 }
00145 
00146 static inline void asv2_put_bits(PutBitContext *pb, int n, int v){
00147     put_bits(pb, n, av_reverse[ v << (8-n) ]);
00148 }
00149 
00150 static inline int asv1_get_level(GetBitContext *gb){
00151     int code= get_vlc2(gb, level_vlc.table, VLC_BITS, 1);
00152 
00153     if(code==3) return get_sbits(gb, 8);
00154     else        return code - 3;
00155 }
00156 
00157 static inline int asv2_get_level(GetBitContext *gb){
00158     int code= get_vlc2(gb, asv2_level_vlc.table, ASV2_LEVEL_VLC_BITS, 1);
00159 
00160     if(code==31) return (int8_t)asv2_get_bits(gb, 8);
00161     else         return code - 31;
00162 }
00163 
00164 static inline void asv1_put_level(PutBitContext *pb, int level){
00165     unsigned int index= level + 3;
00166 
00167     if(index <= 6) put_bits(pb, level_tab[index][1], level_tab[index][0]);
00168     else{
00169         put_bits(pb, level_tab[3][1], level_tab[3][0]);
00170         put_sbits(pb, 8, level);
00171     }
00172 }
00173 
00174 static inline void asv2_put_level(PutBitContext *pb, int level){
00175     unsigned int index= level + 31;
00176 
00177     if(index <= 62) put_bits(pb, asv2_level_tab[index][1], asv2_level_tab[index][0]);
00178     else{
00179         put_bits(pb, asv2_level_tab[31][1], asv2_level_tab[31][0]);
00180         asv2_put_bits(pb, 8, level&0xFF);
00181     }
00182 }
00183 
00184 static inline int asv1_decode_block(ASV1Context *a, DCTELEM block[64]){
00185     int i;
00186 
00187     block[0]= 8*get_bits(&a->gb, 8);
00188 
00189     for(i=0; i<11; i++){
00190         const int ccp= get_vlc2(&a->gb, ccp_vlc.table, VLC_BITS, 1);
00191 
00192         if(ccp){
00193             if(ccp == 16) break;
00194             if(ccp < 0 || i>=10){
00195                 av_log(a->avctx, AV_LOG_ERROR, "coded coeff pattern damaged\n");
00196                 return -1;
00197             }
00198 
00199             if(ccp&8) block[a->scantable.permutated[4*i+0]]= (asv1_get_level(&a->gb) * a->intra_matrix[4*i+0])>>4;
00200             if(ccp&4) block[a->scantable.permutated[4*i+1]]= (asv1_get_level(&a->gb) * a->intra_matrix[4*i+1])>>4;
00201             if(ccp&2) block[a->scantable.permutated[4*i+2]]= (asv1_get_level(&a->gb) * a->intra_matrix[4*i+2])>>4;
00202             if(ccp&1) block[a->scantable.permutated[4*i+3]]= (asv1_get_level(&a->gb) * a->intra_matrix[4*i+3])>>4;
00203         }
00204     }
00205 
00206     return 0;
00207 }
00208 
00209 static inline int asv2_decode_block(ASV1Context *a, DCTELEM block[64]){
00210     int i, count, ccp;
00211 
00212     count= asv2_get_bits(&a->gb, 4);
00213 
00214     block[0]= 8*asv2_get_bits(&a->gb, 8);
00215 
00216     ccp= get_vlc2(&a->gb, dc_ccp_vlc.table, VLC_BITS, 1);
00217     if(ccp){
00218         if(ccp&4) block[a->scantable.permutated[1]]= (asv2_get_level(&a->gb) * a->intra_matrix[1])>>4;
00219         if(ccp&2) block[a->scantable.permutated[2]]= (asv2_get_level(&a->gb) * a->intra_matrix[2])>>4;
00220         if(ccp&1) block[a->scantable.permutated[3]]= (asv2_get_level(&a->gb) * a->intra_matrix[3])>>4;
00221     }
00222 
00223     for(i=1; i<count+1; i++){
00224         const int ccp= get_vlc2(&a->gb, ac_ccp_vlc.table, VLC_BITS, 1);
00225 
00226         if(ccp){
00227             if(ccp&8) block[a->scantable.permutated[4*i+0]]= (asv2_get_level(&a->gb) * a->intra_matrix[4*i+0])>>4;
00228             if(ccp&4) block[a->scantable.permutated[4*i+1]]= (asv2_get_level(&a->gb) * a->intra_matrix[4*i+1])>>4;
00229             if(ccp&2) block[a->scantable.permutated[4*i+2]]= (asv2_get_level(&a->gb) * a->intra_matrix[4*i+2])>>4;
00230             if(ccp&1) block[a->scantable.permutated[4*i+3]]= (asv2_get_level(&a->gb) * a->intra_matrix[4*i+3])>>4;
00231         }
00232     }
00233 
00234     return 0;
00235 }
00236 
00237 static inline void asv1_encode_block(ASV1Context *a, DCTELEM block[64]){
00238     int i;
00239     int nc_count=0;
00240 
00241     put_bits(&a->pb, 8, (block[0] + 32)>>6);
00242     block[0]= 0;
00243 
00244     for(i=0; i<10; i++){
00245         const int index= scantab[4*i];
00246         int ccp=0;
00247 
00248         if( (block[index + 0] = (block[index + 0]*a->q_intra_matrix[index + 0] + (1<<15))>>16) ) ccp |= 8;
00249         if( (block[index + 8] = (block[index + 8]*a->q_intra_matrix[index + 8] + (1<<15))>>16) ) ccp |= 4;
00250         if( (block[index + 1] = (block[index + 1]*a->q_intra_matrix[index + 1] + (1<<15))>>16) ) ccp |= 2;
00251         if( (block[index + 9] = (block[index + 9]*a->q_intra_matrix[index + 9] + (1<<15))>>16) ) ccp |= 1;
00252 
00253         if(ccp){
00254             for(;nc_count; nc_count--)
00255                 put_bits(&a->pb, ccp_tab[0][1], ccp_tab[0][0]);
00256 
00257             put_bits(&a->pb, ccp_tab[ccp][1], ccp_tab[ccp][0]);
00258 
00259             if(ccp&8) asv1_put_level(&a->pb, block[index + 0]);
00260             if(ccp&4) asv1_put_level(&a->pb, block[index + 8]);
00261             if(ccp&2) asv1_put_level(&a->pb, block[index + 1]);
00262             if(ccp&1) asv1_put_level(&a->pb, block[index + 9]);
00263         }else{
00264             nc_count++;
00265         }
00266     }
00267     put_bits(&a->pb, ccp_tab[16][1], ccp_tab[16][0]);
00268 }
00269 
00270 static inline void asv2_encode_block(ASV1Context *a, DCTELEM block[64]){
00271     int i;
00272     int count=0;
00273 
00274     for(count=63; count>3; count--){
00275         const int index= scantab[count];
00276 
00277         if( (block[index]*a->q_intra_matrix[index] + (1<<15))>>16 )
00278             break;
00279     }
00280 
00281     count >>= 2;
00282 
00283     asv2_put_bits(&a->pb, 4, count);
00284     asv2_put_bits(&a->pb, 8, (block[0] + 32)>>6);
00285     block[0]= 0;
00286 
00287     for(i=0; i<=count; i++){
00288         const int index= scantab[4*i];
00289         int ccp=0;
00290 
00291         if( (block[index + 0] = (block[index + 0]*a->q_intra_matrix[index + 0] + (1<<15))>>16) ) ccp |= 8;
00292         if( (block[index + 8] = (block[index + 8]*a->q_intra_matrix[index + 8] + (1<<15))>>16) ) ccp |= 4;
00293         if( (block[index + 1] = (block[index + 1]*a->q_intra_matrix[index + 1] + (1<<15))>>16) ) ccp |= 2;
00294         if( (block[index + 9] = (block[index + 9]*a->q_intra_matrix[index + 9] + (1<<15))>>16) ) ccp |= 1;
00295 
00296         assert(i || ccp<8);
00297         if(i) put_bits(&a->pb, ac_ccp_tab[ccp][1], ac_ccp_tab[ccp][0]);
00298         else  put_bits(&a->pb, dc_ccp_tab[ccp][1], dc_ccp_tab[ccp][0]);
00299 
00300         if(ccp){
00301             if(ccp&8) asv2_put_level(&a->pb, block[index + 0]);
00302             if(ccp&4) asv2_put_level(&a->pb, block[index + 8]);
00303             if(ccp&2) asv2_put_level(&a->pb, block[index + 1]);
00304             if(ccp&1) asv2_put_level(&a->pb, block[index + 9]);
00305         }
00306     }
00307 }
00308 
00309 static inline int decode_mb(ASV1Context *a, DCTELEM block[6][64]){
00310     int i;
00311 
00312     a->dsp.clear_blocks(block[0]);
00313 
00314     if(a->avctx->codec_id == CODEC_ID_ASV1){
00315         for(i=0; i<6; i++){
00316             if( asv1_decode_block(a, block[i]) < 0)
00317                 return -1;
00318         }
00319     }else{
00320         for(i=0; i<6; i++){
00321             if( asv2_decode_block(a, block[i]) < 0)
00322                 return -1;
00323         }
00324     }
00325     return 0;
00326 }
00327 
00328 static inline int encode_mb(ASV1Context *a, DCTELEM block[6][64]){
00329     int i;
00330 
00331     if(a->pb.buf_end - a->pb.buf - (put_bits_count(&a->pb)>>3) < 30*16*16*3/2/8){
00332         av_log(a->avctx, AV_LOG_ERROR, "encoded frame too large\n");
00333         return -1;
00334     }
00335 
00336     if(a->avctx->codec_id == CODEC_ID_ASV1){
00337         for(i=0; i<6; i++)
00338             asv1_encode_block(a, block[i]);
00339     }else{
00340         for(i=0; i<6; i++)
00341             asv2_encode_block(a, block[i]);
00342     }
00343     return 0;
00344 }
00345 
00346 static inline void idct_put(ASV1Context *a, int mb_x, int mb_y){
00347     DCTELEM (*block)[64]= a->block;
00348     int linesize= a->picture.linesize[0];
00349 
00350     uint8_t *dest_y  = a->picture.data[0] + (mb_y * 16* linesize              ) + mb_x * 16;
00351     uint8_t *dest_cb = a->picture.data[1] + (mb_y * 8 * a->picture.linesize[1]) + mb_x * 8;
00352     uint8_t *dest_cr = a->picture.data[2] + (mb_y * 8 * a->picture.linesize[2]) + mb_x * 8;
00353 
00354     a->dsp.idct_put(dest_y                 , linesize, block[0]);
00355     a->dsp.idct_put(dest_y              + 8, linesize, block[1]);
00356     a->dsp.idct_put(dest_y + 8*linesize    , linesize, block[2]);
00357     a->dsp.idct_put(dest_y + 8*linesize + 8, linesize, block[3]);
00358 
00359     if(!(a->avctx->flags&CODEC_FLAG_GRAY)){
00360         a->dsp.idct_put(dest_cb, a->picture.linesize[1], block[4]);
00361         a->dsp.idct_put(dest_cr, a->picture.linesize[2], block[5]);
00362     }
00363 }
00364 
00365 static inline void dct_get(ASV1Context *a, int mb_x, int mb_y){
00366     DCTELEM (*block)[64]= a->block;
00367     int linesize= a->picture.linesize[0];
00368     int i;
00369 
00370     uint8_t *ptr_y  = a->picture.data[0] + (mb_y * 16* linesize              ) + mb_x * 16;
00371     uint8_t *ptr_cb = a->picture.data[1] + (mb_y * 8 * a->picture.linesize[1]) + mb_x * 8;
00372     uint8_t *ptr_cr = a->picture.data[2] + (mb_y * 8 * a->picture.linesize[2]) + mb_x * 8;
00373 
00374     a->dsp.get_pixels(block[0], ptr_y                 , linesize);
00375     a->dsp.get_pixels(block[1], ptr_y              + 8, linesize);
00376     a->dsp.get_pixels(block[2], ptr_y + 8*linesize    , linesize);
00377     a->dsp.get_pixels(block[3], ptr_y + 8*linesize + 8, linesize);
00378     for(i=0; i<4; i++)
00379         a->dsp.fdct(block[i]);
00380 
00381     if(!(a->avctx->flags&CODEC_FLAG_GRAY)){
00382         a->dsp.get_pixels(block[4], ptr_cb, a->picture.linesize[1]);
00383         a->dsp.get_pixels(block[5], ptr_cr, a->picture.linesize[2]);
00384         for(i=4; i<6; i++)
00385             a->dsp.fdct(block[i]);
00386     }
00387 }
00388 
00389 static int decode_frame(AVCodecContext *avctx,
00390                         void *data, int *data_size,
00391                         AVPacket *avpkt)
00392 {
00393     const uint8_t *buf = avpkt->data;
00394     int buf_size = avpkt->size;
00395     ASV1Context * const a = avctx->priv_data;
00396     AVFrame *picture = data;
00397     AVFrame * const p= &a->picture;
00398     int mb_x, mb_y;
00399 
00400     if(p->data[0])
00401         avctx->release_buffer(avctx, p);
00402 
00403     p->reference= 0;
00404     if(avctx->get_buffer(avctx, p) < 0){
00405         av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
00406         return -1;
00407     }
00408     p->pict_type= AV_PICTURE_TYPE_I;
00409     p->key_frame= 1;
00410 
00411     av_fast_malloc(&a->bitstream_buffer, &a->bitstream_buffer_size, buf_size + FF_INPUT_BUFFER_PADDING_SIZE);
00412     if (!a->bitstream_buffer)
00413         return AVERROR(ENOMEM);
00414 
00415     if(avctx->codec_id == CODEC_ID_ASV1)
00416         a->dsp.bswap_buf((uint32_t*)a->bitstream_buffer, (const uint32_t*)buf, buf_size/4);
00417     else{
00418         int i;
00419         for(i=0; i<buf_size; i++)
00420             a->bitstream_buffer[i]= av_reverse[ buf[i] ];
00421     }
00422 
00423     init_get_bits(&a->gb, a->bitstream_buffer, buf_size*8);
00424 
00425     for(mb_y=0; mb_y<a->mb_height2; mb_y++){
00426         for(mb_x=0; mb_x<a->mb_width2; mb_x++){
00427             if( decode_mb(a, a->block) <0)
00428                 return -1;
00429 
00430             idct_put(a, mb_x, mb_y);
00431         }
00432     }
00433 
00434     if(a->mb_width2 != a->mb_width){
00435         mb_x= a->mb_width2;
00436         for(mb_y=0; mb_y<a->mb_height2; mb_y++){
00437             if( decode_mb(a, a->block) <0)
00438                 return -1;
00439 
00440             idct_put(a, mb_x, mb_y);
00441         }
00442     }
00443 
00444     if(a->mb_height2 != a->mb_height){
00445         mb_y= a->mb_height2;
00446         for(mb_x=0; mb_x<a->mb_width; mb_x++){
00447             if( decode_mb(a, a->block) <0)
00448                 return -1;
00449 
00450             idct_put(a, mb_x, mb_y);
00451         }
00452     }
00453 
00454     *picture= *(AVFrame*)&a->picture;
00455     *data_size = sizeof(AVPicture);
00456 
00457     emms_c();
00458 
00459     return (get_bits_count(&a->gb)+31)/32*4;
00460 }
00461 
00462 #if CONFIG_ASV1_ENCODER || CONFIG_ASV2_ENCODER
00463 static int encode_frame(AVCodecContext *avctx, unsigned char *buf, int buf_size, void *data){
00464     ASV1Context * const a = avctx->priv_data;
00465     AVFrame *pict = data;
00466     AVFrame * const p= &a->picture;
00467     int size;
00468     int mb_x, mb_y;
00469 
00470     init_put_bits(&a->pb, buf, buf_size);
00471 
00472     *p = *pict;
00473     p->pict_type= AV_PICTURE_TYPE_I;
00474     p->key_frame= 1;
00475 
00476     for(mb_y=0; mb_y<a->mb_height2; mb_y++){
00477         for(mb_x=0; mb_x<a->mb_width2; mb_x++){
00478             dct_get(a, mb_x, mb_y);
00479             encode_mb(a, a->block);
00480         }
00481     }
00482 
00483     if(a->mb_width2 != a->mb_width){
00484         mb_x= a->mb_width2;
00485         for(mb_y=0; mb_y<a->mb_height2; mb_y++){
00486             dct_get(a, mb_x, mb_y);
00487             encode_mb(a, a->block);
00488         }
00489     }
00490 
00491     if(a->mb_height2 != a->mb_height){
00492         mb_y= a->mb_height2;
00493         for(mb_x=0; mb_x<a->mb_width; mb_x++){
00494             dct_get(a, mb_x, mb_y);
00495             encode_mb(a, a->block);
00496         }
00497     }
00498     emms_c();
00499 
00500     avpriv_align_put_bits(&a->pb);
00501     while(put_bits_count(&a->pb)&31)
00502         put_bits(&a->pb, 8, 0);
00503 
00504     size= put_bits_count(&a->pb)/32;
00505 
00506     if(avctx->codec_id == CODEC_ID_ASV1)
00507         a->dsp.bswap_buf((uint32_t*)buf, (uint32_t*)buf, size);
00508     else{
00509         int i;
00510         for(i=0; i<4*size; i++)
00511             buf[i]= av_reverse[ buf[i] ];
00512     }
00513 
00514     return size*4;
00515 }
00516 #endif /* CONFIG_ASV1_ENCODER || CONFIG_ASV2_ENCODER */
00517 
00518 static av_cold void common_init(AVCodecContext *avctx){
00519     ASV1Context * const a = avctx->priv_data;
00520 
00521     dsputil_init(&a->dsp, avctx);
00522 
00523     a->mb_width   = (avctx->width  + 15) / 16;
00524     a->mb_height  = (avctx->height + 15) / 16;
00525     a->mb_width2  = (avctx->width  + 0) / 16;
00526     a->mb_height2 = (avctx->height + 0) / 16;
00527 
00528     avctx->coded_frame= &a->picture;
00529     a->avctx= avctx;
00530 }
00531 
00532 static av_cold int decode_init(AVCodecContext *avctx){
00533     ASV1Context * const a = avctx->priv_data;
00534     AVFrame *p= &a->picture;
00535     int i;
00536     const int scale= avctx->codec_id == CODEC_ID_ASV1 ? 1 : 2;
00537 
00538     common_init(avctx);
00539     init_vlcs(a);
00540     ff_init_scantable(a->dsp.idct_permutation, &a->scantable, scantab);
00541     avctx->pix_fmt= PIX_FMT_YUV420P;
00542 
00543     a->inv_qscale= avctx->extradata[0];
00544     if(a->inv_qscale == 0){
00545         av_log(avctx, AV_LOG_ERROR, "illegal qscale 0\n");
00546         if(avctx->codec_id == CODEC_ID_ASV1)
00547             a->inv_qscale= 6;
00548         else
00549             a->inv_qscale= 10;
00550     }
00551 
00552     for(i=0; i<64; i++){
00553         int index= scantab[i];
00554 
00555         a->intra_matrix[i]= 64*scale*ff_mpeg1_default_intra_matrix[index] / a->inv_qscale;
00556     }
00557 
00558     p->qstride= a->mb_width;
00559     p->qscale_table= av_malloc( p->qstride * a->mb_height);
00560     p->quality= (32*scale + a->inv_qscale/2)/a->inv_qscale;
00561     memset(p->qscale_table, p->quality, p->qstride*a->mb_height);
00562 
00563     return 0;
00564 }
00565 
00566 #if CONFIG_ASV1_ENCODER || CONFIG_ASV2_ENCODER
00567 static av_cold int encode_init(AVCodecContext *avctx){
00568     ASV1Context * const a = avctx->priv_data;
00569     int i;
00570     const int scale= avctx->codec_id == CODEC_ID_ASV1 ? 1 : 2;
00571 
00572     common_init(avctx);
00573 
00574     if(avctx->global_quality == 0) avctx->global_quality= 4*FF_QUALITY_SCALE;
00575 
00576     a->inv_qscale= (32*scale*FF_QUALITY_SCALE +  avctx->global_quality/2) / avctx->global_quality;
00577 
00578     avctx->extradata= av_mallocz(8);
00579     avctx->extradata_size=8;
00580     ((uint32_t*)avctx->extradata)[0]= av_le2ne32(a->inv_qscale);
00581     ((uint32_t*)avctx->extradata)[1]= av_le2ne32(AV_RL32("ASUS"));
00582 
00583     for(i=0; i<64; i++){
00584         int q= 32*scale*ff_mpeg1_default_intra_matrix[i];
00585         a->q_intra_matrix[i]= ((a->inv_qscale<<16) + q/2) / q;
00586     }
00587 
00588     return 0;
00589 }
00590 #endif /* CONFIG_ASV1_ENCODER || CONFIG_ASV2_ENCODER */
00591 
00592 static av_cold int decode_end(AVCodecContext *avctx){
00593     ASV1Context * const a = avctx->priv_data;
00594 
00595     av_freep(&a->bitstream_buffer);
00596     av_freep(&a->picture.qscale_table);
00597     a->bitstream_buffer_size=0;
00598 
00599     if(a->picture.data[0])
00600         avctx->release_buffer(avctx, &a->picture);
00601 
00602     return 0;
00603 }
00604 
00605 AVCodec ff_asv1_decoder = {
00606     .name           = "asv1",
00607     .type           = AVMEDIA_TYPE_VIDEO,
00608     .id             = CODEC_ID_ASV1,
00609     .priv_data_size = sizeof(ASV1Context),
00610     .init           = decode_init,
00611     .close          = decode_end,
00612     .decode         = decode_frame,
00613     .capabilities   = CODEC_CAP_DR1,
00614     .long_name= NULL_IF_CONFIG_SMALL("ASUS V1"),
00615 };
00616 
00617 AVCodec ff_asv2_decoder = {
00618     .name           = "asv2",
00619     .type           = AVMEDIA_TYPE_VIDEO,
00620     .id             = CODEC_ID_ASV2,
00621     .priv_data_size = sizeof(ASV1Context),
00622     .init           = decode_init,
00623     .close          = decode_end,
00624     .decode         = decode_frame,
00625     .capabilities   = CODEC_CAP_DR1,
00626     .long_name= NULL_IF_CONFIG_SMALL("ASUS V2"),
00627 };
00628 
00629 #if CONFIG_ASV1_ENCODER
00630 AVCodec ff_asv1_encoder = {
00631     .name           = "asv1",
00632     .type           = AVMEDIA_TYPE_VIDEO,
00633     .id             = CODEC_ID_ASV1,
00634     .priv_data_size = sizeof(ASV1Context),
00635     .init           = encode_init,
00636     .encode         = encode_frame,
00637     //encode_end,
00638     .pix_fmts= (const enum PixelFormat[]){PIX_FMT_YUV420P, PIX_FMT_NONE},
00639     .long_name= NULL_IF_CONFIG_SMALL("ASUS V1"),
00640 };
00641 #endif
00642 
00643 #if CONFIG_ASV2_ENCODER
00644 AVCodec ff_asv2_encoder = {
00645     .name           = "asv2",
00646     .type           = AVMEDIA_TYPE_VIDEO,
00647     .id             = CODEC_ID_ASV2,
00648     .priv_data_size = sizeof(ASV1Context),
00649     .init           = encode_init,
00650     .encode         = encode_frame,
00651     //encode_end,
00652     .pix_fmts= (const enum PixelFormat[]){PIX_FMT_YUV420P, PIX_FMT_NONE},
00653     .long_name= NULL_IF_CONFIG_SMALL("ASUS V2"),
00654 };
00655 #endif
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