• Main Page
  • Related Pages
  • Modules
  • Data Structures
  • Files
  • File List
  • Globals

libavcodec/asv1.c

Go to the documentation of this file.
00001 /*
00002  * ASUS V1/V2 codec
00003  * Copyright (c) 2003 Michael Niedermayer
00004  *
00005  * This file is part of FFmpeg.
00006  *
00007  * FFmpeg 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  * FFmpeg 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 FFmpeg; 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 "bitstream.h"
00029 #include "dsputil.h"
00030 #include "mpeg12data.h"
00031 
00032 //#undef NDEBUG
00033 //#include <assert.h>
00034 
00035 #define VLC_BITS 6
00036 #define ASV2_LEVEL_VLC_BITS 10
00037 
00038 typedef struct ASV1Context{
00039     AVCodecContext *avctx;
00040     DSPContext dsp;
00041     AVFrame picture;
00042     PutBitContext pb;
00043     GetBitContext gb;
00044     ScanTable scantable;
00045     int inv_qscale;
00046     int mb_width;
00047     int mb_height;
00048     int mb_width2;
00049     int mb_height2;
00050     DECLARE_ALIGNED_16(DCTELEM, block[6][64]);
00051     DECLARE_ALIGNED_8(uint16_t, intra_matrix[64]);
00052     DECLARE_ALIGNED_8(int, q_intra_matrix[64]);
00053     uint8_t *bitstream_buffer;
00054     unsigned int bitstream_buffer_size;
00055 } ASV1Context;
00056 
00057 static const uint8_t scantab[64]={
00058     0x00,0x08,0x01,0x09,0x10,0x18,0x11,0x19,
00059     0x02,0x0A,0x03,0x0B,0x12,0x1A,0x13,0x1B,
00060     0x04,0x0C,0x05,0x0D,0x20,0x28,0x21,0x29,
00061     0x06,0x0E,0x07,0x0F,0x14,0x1C,0x15,0x1D,
00062     0x22,0x2A,0x23,0x2B,0x30,0x38,0x31,0x39,
00063     0x16,0x1E,0x17,0x1F,0x24,0x2C,0x25,0x2D,
00064     0x32,0x3A,0x33,0x3B,0x26,0x2E,0x27,0x2F,
00065     0x34,0x3C,0x35,0x3D,0x36,0x3E,0x37,0x3F,
00066 };
00067 
00068 
00069 static const uint8_t ccp_tab[17][2]={
00070     {0x2,2}, {0x7,5}, {0xB,5}, {0x3,5},
00071     {0xD,5}, {0x5,5}, {0x9,5}, {0x1,5},
00072     {0xE,5}, {0x6,5}, {0xA,5}, {0x2,5},
00073     {0xC,5}, {0x4,5}, {0x8,5}, {0x3,2},
00074     {0xF,5}, //EOB
00075 };
00076 
00077 static const uint8_t level_tab[7][2]={
00078     {3,4}, {3,3}, {3,2}, {0,3}, {2,2}, {2,3}, {2,4}
00079 };
00080 
00081 static const uint8_t dc_ccp_tab[8][2]={
00082     {0x1,2}, {0xD,4}, {0xF,4}, {0xC,4},
00083     {0x5,3}, {0xE,4}, {0x4,3}, {0x0,2},
00084 };
00085 
00086 static const uint8_t ac_ccp_tab[16][2]={
00087     {0x00,2}, {0x3B,6}, {0x0A,4}, {0x3A,6},
00088     {0x02,3}, {0x39,6}, {0x3C,6}, {0x38,6},
00089     {0x03,3}, {0x3D,6}, {0x08,4}, {0x1F,5},
00090     {0x09,4}, {0x0B,4}, {0x0D,4}, {0x0C,4},
00091 };
00092 
00093 static const uint8_t asv2_level_tab[63][2]={
00094     {0x3F,10},{0x2F,10},{0x37,10},{0x27,10},{0x3B,10},{0x2B,10},{0x33,10},{0x23,10},
00095     {0x3D,10},{0x2D,10},{0x35,10},{0x25,10},{0x39,10},{0x29,10},{0x31,10},{0x21,10},
00096     {0x1F, 8},{0x17, 8},{0x1B, 8},{0x13, 8},{0x1D, 8},{0x15, 8},{0x19, 8},{0x11, 8},
00097     {0x0F, 6},{0x0B, 6},{0x0D, 6},{0x09, 6},
00098     {0x07, 4},{0x05, 4},
00099     {0x03, 2},
00100     {0x00, 5},
00101     {0x02, 2},
00102     {0x04, 4},{0x06, 4},
00103     {0x08, 6},{0x0C, 6},{0x0A, 6},{0x0E, 6},
00104     {0x10, 8},{0x18, 8},{0x14, 8},{0x1C, 8},{0x12, 8},{0x1A, 8},{0x16, 8},{0x1E, 8},
00105     {0x20,10},{0x30,10},{0x28,10},{0x38,10},{0x24,10},{0x34,10},{0x2C,10},{0x3C,10},
00106     {0x22,10},{0x32,10},{0x2A,10},{0x3A,10},{0x26,10},{0x36,10},{0x2E,10},{0x3E,10},
00107 };
00108 
00109 
00110 static VLC ccp_vlc;
00111 static VLC level_vlc;
00112 static VLC dc_ccp_vlc;
00113 static VLC ac_ccp_vlc;
00114 static VLC asv2_level_vlc;
00115 
00116 static av_cold void init_vlcs(ASV1Context *a){
00117     static int done = 0;
00118 
00119     if (!done) {
00120         done = 1;
00121 
00122         init_vlc(&ccp_vlc, VLC_BITS, 17,
00123                  &ccp_tab[0][1], 2, 1,
00124                  &ccp_tab[0][0], 2, 1, 1);
00125         init_vlc(&dc_ccp_vlc, VLC_BITS, 8,
00126                  &dc_ccp_tab[0][1], 2, 1,
00127                  &dc_ccp_tab[0][0], 2, 1, 1);
00128         init_vlc(&ac_ccp_vlc, VLC_BITS, 16,
00129                  &ac_ccp_tab[0][1], 2, 1,
00130                  &ac_ccp_tab[0][0], 2, 1, 1);
00131         init_vlc(&level_vlc,  VLC_BITS, 7,
00132                  &level_tab[0][1], 2, 1,
00133                  &level_tab[0][0], 2, 1, 1);
00134         init_vlc(&asv2_level_vlc, ASV2_LEVEL_VLC_BITS, 63,
00135                  &asv2_level_tab[0][1], 2, 1,
00136                  &asv2_level_tab[0][0], 2, 1, 1);
00137     }
00138 }
00139 
00140 //FIXME write a reversed bitstream reader to avoid the double reverse
00141 static inline int asv2_get_bits(GetBitContext *gb, int n){
00142     return ff_reverse[ get_bits(gb, n) << (8-n) ];
00143 }
00144 
00145 static inline void asv2_put_bits(PutBitContext *pb, int n, int v){
00146     put_bits(pb, n, ff_reverse[ v << (8-n) ]);
00147 }
00148 
00149 static inline int asv1_get_level(GetBitContext *gb){
00150     int code= get_vlc2(gb, level_vlc.table, VLC_BITS, 1);
00151 
00152     if(code==3) return get_sbits(gb, 8);
00153     else        return code - 3;
00154 }
00155 
00156 static inline int asv2_get_level(GetBitContext *gb){
00157     int code= get_vlc2(gb, asv2_level_vlc.table, ASV2_LEVEL_VLC_BITS, 1);
00158 
00159     if(code==31) return (int8_t)asv2_get_bits(gb, 8);
00160     else         return code - 31;
00161 }
00162 
00163 static inline void asv1_put_level(PutBitContext *pb, int level){
00164     unsigned int index= level + 3;
00165 
00166     if(index <= 6) put_bits(pb, level_tab[index][1], level_tab[index][0]);
00167     else{
00168         put_bits(pb, level_tab[3][1], level_tab[3][0]);
00169         put_sbits(pb, 8, level);
00170     }
00171 }
00172 
00173 static inline void asv2_put_level(PutBitContext *pb, int level){
00174     unsigned int index= level + 31;
00175 
00176     if(index <= 62) put_bits(pb, asv2_level_tab[index][1], asv2_level_tab[index][0]);
00177     else{
00178         put_bits(pb, asv2_level_tab[31][1], asv2_level_tab[31][0]);
00179         asv2_put_bits(pb, 8, level&0xFF);
00180     }
00181 }
00182 
00183 static inline int asv1_decode_block(ASV1Context *a, DCTELEM block[64]){
00184     int i;
00185 
00186     block[0]= 8*get_bits(&a->gb, 8);
00187 
00188     for(i=0; i<11; i++){
00189         const int ccp= get_vlc2(&a->gb, ccp_vlc.table, VLC_BITS, 1);
00190 
00191         if(ccp){
00192             if(ccp == 16) break;
00193             if(ccp < 0 || i>=10){
00194                 av_log(a->avctx, AV_LOG_ERROR, "coded coeff pattern damaged\n");
00195                 return -1;
00196             }
00197 
00198             if(ccp&8) block[a->scantable.permutated[4*i+0]]= (asv1_get_level(&a->gb) * a->intra_matrix[4*i+0])>>4;
00199             if(ccp&4) block[a->scantable.permutated[4*i+1]]= (asv1_get_level(&a->gb) * a->intra_matrix[4*i+1])>>4;
00200             if(ccp&2) block[a->scantable.permutated[4*i+2]]= (asv1_get_level(&a->gb) * a->intra_matrix[4*i+2])>>4;
00201             if(ccp&1) block[a->scantable.permutated[4*i+3]]= (asv1_get_level(&a->gb) * a->intra_matrix[4*i+3])>>4;
00202         }
00203     }
00204 
00205     return 0;
00206 }
00207 
00208 static inline int asv2_decode_block(ASV1Context *a, DCTELEM block[64]){
00209     int i, count, ccp;
00210 
00211     count= asv2_get_bits(&a->gb, 4);
00212 
00213     block[0]= 8*asv2_get_bits(&a->gb, 8);
00214 
00215     ccp= get_vlc2(&a->gb, dc_ccp_vlc.table, VLC_BITS, 1);
00216     if(ccp){
00217         if(ccp&4) block[a->scantable.permutated[1]]= (asv2_get_level(&a->gb) * a->intra_matrix[1])>>4;
00218         if(ccp&2) block[a->scantable.permutated[2]]= (asv2_get_level(&a->gb) * a->intra_matrix[2])>>4;
00219         if(ccp&1) block[a->scantable.permutated[3]]= (asv2_get_level(&a->gb) * a->intra_matrix[3])>>4;
00220     }
00221 
00222     for(i=1; i<count+1; i++){
00223         const int ccp= get_vlc2(&a->gb, ac_ccp_vlc.table, VLC_BITS, 1);
00224 
00225         if(ccp){
00226             if(ccp&8) block[a->scantable.permutated[4*i+0]]= (asv2_get_level(&a->gb) * a->intra_matrix[4*i+0])>>4;
00227             if(ccp&4) block[a->scantable.permutated[4*i+1]]= (asv2_get_level(&a->gb) * a->intra_matrix[4*i+1])>>4;
00228             if(ccp&2) block[a->scantable.permutated[4*i+2]]= (asv2_get_level(&a->gb) * a->intra_matrix[4*i+2])>>4;
00229             if(ccp&1) block[a->scantable.permutated[4*i+3]]= (asv2_get_level(&a->gb) * a->intra_matrix[4*i+3])>>4;
00230         }
00231     }
00232 
00233     return 0;
00234 }
00235 
00236 static inline void asv1_encode_block(ASV1Context *a, DCTELEM block[64]){
00237     int i;
00238     int nc_count=0;
00239 
00240     put_bits(&a->pb, 8, (block[0] + 32)>>6);
00241     block[0]= 0;
00242 
00243     for(i=0; i<10; i++){
00244         const int index= scantab[4*i];
00245         int ccp=0;
00246 
00247         if( (block[index + 0] = (block[index + 0]*a->q_intra_matrix[index + 0] + (1<<15))>>16) ) ccp |= 8;
00248         if( (block[index + 8] = (block[index + 8]*a->q_intra_matrix[index + 8] + (1<<15))>>16) ) ccp |= 4;
00249         if( (block[index + 1] = (block[index + 1]*a->q_intra_matrix[index + 1] + (1<<15))>>16) ) ccp |= 2;
00250         if( (block[index + 9] = (block[index + 9]*a->q_intra_matrix[index + 9] + (1<<15))>>16) ) ccp |= 1;
00251 
00252         if(ccp){
00253             for(;nc_count; nc_count--)
00254                 put_bits(&a->pb, ccp_tab[0][1], ccp_tab[0][0]);
00255 
00256             put_bits(&a->pb, ccp_tab[ccp][1], ccp_tab[ccp][0]);
00257 
00258             if(ccp&8) asv1_put_level(&a->pb, block[index + 0]);
00259             if(ccp&4) asv1_put_level(&a->pb, block[index + 8]);
00260             if(ccp&2) asv1_put_level(&a->pb, block[index + 1]);
00261             if(ccp&1) asv1_put_level(&a->pb, block[index + 9]);
00262         }else{
00263             nc_count++;
00264         }
00265     }
00266     put_bits(&a->pb, ccp_tab[16][1], ccp_tab[16][0]);
00267 }
00268 
00269 static inline void asv2_encode_block(ASV1Context *a, DCTELEM block[64]){
00270     int i;
00271     int count=0;
00272 
00273     for(count=63; count>3; count--){
00274         const int index= scantab[count];
00275 
00276         if( (block[index]*a->q_intra_matrix[index] + (1<<15))>>16 )
00277             break;
00278     }
00279 
00280     count >>= 2;
00281 
00282     asv2_put_bits(&a->pb, 4, count);
00283     asv2_put_bits(&a->pb, 8, (block[0] + 32)>>6);
00284     block[0]= 0;
00285 
00286     for(i=0; i<=count; i++){
00287         const int index= scantab[4*i];
00288         int ccp=0;
00289 
00290         if( (block[index + 0] = (block[index + 0]*a->q_intra_matrix[index + 0] + (1<<15))>>16) ) ccp |= 8;
00291         if( (block[index + 8] = (block[index + 8]*a->q_intra_matrix[index + 8] + (1<<15))>>16) ) ccp |= 4;
00292         if( (block[index + 1] = (block[index + 1]*a->q_intra_matrix[index + 1] + (1<<15))>>16) ) ccp |= 2;
00293         if( (block[index + 9] = (block[index + 9]*a->q_intra_matrix[index + 9] + (1<<15))>>16) ) ccp |= 1;
00294 
00295         assert(i || ccp<8);
00296         if(i) put_bits(&a->pb, ac_ccp_tab[ccp][1], ac_ccp_tab[ccp][0]);
00297         else  put_bits(&a->pb, dc_ccp_tab[ccp][1], dc_ccp_tab[ccp][0]);
00298 
00299         if(ccp){
00300             if(ccp&8) asv2_put_level(&a->pb, block[index + 0]);
00301             if(ccp&4) asv2_put_level(&a->pb, block[index + 8]);
00302             if(ccp&2) asv2_put_level(&a->pb, block[index + 1]);
00303             if(ccp&1) asv2_put_level(&a->pb, block[index + 9]);
00304         }
00305     }
00306 }
00307 
00308 static inline int decode_mb(ASV1Context *a, DCTELEM block[6][64]){
00309     int i;
00310 
00311     a->dsp.clear_blocks(block[0]);
00312 
00313     if(a->avctx->codec_id == CODEC_ID_ASV1){
00314         for(i=0; i<6; i++){
00315             if( asv1_decode_block(a, block[i]) < 0)
00316                 return -1;
00317         }
00318     }else{
00319         for(i=0; i<6; i++){
00320             if( asv2_decode_block(a, block[i]) < 0)
00321                 return -1;
00322         }
00323     }
00324     return 0;
00325 }
00326 
00327 static inline int encode_mb(ASV1Context *a, DCTELEM block[6][64]){
00328     int i;
00329 
00330     if(a->pb.buf_end - a->pb.buf - (put_bits_count(&a->pb)>>3) < 30*16*16*3/2/8){
00331         av_log(a->avctx, AV_LOG_ERROR, "encoded frame too large\n");
00332         return -1;
00333     }
00334 
00335     if(a->avctx->codec_id == CODEC_ID_ASV1){
00336         for(i=0; i<6; i++)
00337             asv1_encode_block(a, block[i]);
00338     }else{
00339         for(i=0; i<6; i++)
00340             asv2_encode_block(a, block[i]);
00341     }
00342     return 0;
00343 }
00344 
00345 static inline void idct_put(ASV1Context *a, int mb_x, int mb_y){
00346     DCTELEM (*block)[64]= a->block;
00347     int linesize= a->picture.linesize[0];
00348 
00349     uint8_t *dest_y  = a->picture.data[0] + (mb_y * 16* linesize              ) + mb_x * 16;
00350     uint8_t *dest_cb = a->picture.data[1] + (mb_y * 8 * a->picture.linesize[1]) + mb_x * 8;
00351     uint8_t *dest_cr = a->picture.data[2] + (mb_y * 8 * a->picture.linesize[2]) + mb_x * 8;
00352 
00353     a->dsp.idct_put(dest_y                 , linesize, block[0]);
00354     a->dsp.idct_put(dest_y              + 8, linesize, block[1]);
00355     a->dsp.idct_put(dest_y + 8*linesize    , linesize, block[2]);
00356     a->dsp.idct_put(dest_y + 8*linesize + 8, linesize, block[3]);
00357 
00358     if(!(a->avctx->flags&CODEC_FLAG_GRAY)){
00359         a->dsp.idct_put(dest_cb, a->picture.linesize[1], block[4]);
00360         a->dsp.idct_put(dest_cr, a->picture.linesize[2], block[5]);
00361     }
00362 }
00363 
00364 static inline void dct_get(ASV1Context *a, int mb_x, int mb_y){
00365     DCTELEM (*block)[64]= a->block;
00366     int linesize= a->picture.linesize[0];
00367     int i;
00368 
00369     uint8_t *ptr_y  = a->picture.data[0] + (mb_y * 16* linesize              ) + mb_x * 16;
00370     uint8_t *ptr_cb = a->picture.data[1] + (mb_y * 8 * a->picture.linesize[1]) + mb_x * 8;
00371     uint8_t *ptr_cr = a->picture.data[2] + (mb_y * 8 * a->picture.linesize[2]) + mb_x * 8;
00372 
00373     a->dsp.get_pixels(block[0], ptr_y                 , linesize);
00374     a->dsp.get_pixels(block[1], ptr_y              + 8, linesize);
00375     a->dsp.get_pixels(block[2], ptr_y + 8*linesize    , linesize);
00376     a->dsp.get_pixels(block[3], ptr_y + 8*linesize + 8, linesize);
00377     for(i=0; i<4; i++)
00378         a->dsp.fdct(block[i]);
00379 
00380     if(!(a->avctx->flags&CODEC_FLAG_GRAY)){
00381         a->dsp.get_pixels(block[4], ptr_cb, a->picture.linesize[1]);
00382         a->dsp.get_pixels(block[5], ptr_cr, a->picture.linesize[2]);
00383         for(i=4; i<6; i++)
00384             a->dsp.fdct(block[i]);
00385     }
00386 }
00387 
00388 static int decode_frame(AVCodecContext *avctx,
00389                         void *data, int *data_size,
00390                         const uint8_t *buf, int buf_size)
00391 {
00392     ASV1Context * const a = avctx->priv_data;
00393     AVFrame *picture = data;
00394     AVFrame * const p= (AVFrame*)&a->picture;
00395     int mb_x, mb_y;
00396 
00397     if(p->data[0])
00398         avctx->release_buffer(avctx, p);
00399 
00400     p->reference= 0;
00401     if(avctx->get_buffer(avctx, p) < 0){
00402         av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
00403         return -1;
00404     }
00405     p->pict_type= FF_I_TYPE;
00406     p->key_frame= 1;
00407 
00408     a->bitstream_buffer= av_fast_realloc(a->bitstream_buffer, &a->bitstream_buffer_size, buf_size + FF_INPUT_BUFFER_PADDING_SIZE);
00409 
00410     if(avctx->codec_id == CODEC_ID_ASV1)
00411         a->dsp.bswap_buf((uint32_t*)a->bitstream_buffer, (const uint32_t*)buf, buf_size/4);
00412     else{
00413         int i;
00414         for(i=0; i<buf_size; i++)
00415             a->bitstream_buffer[i]= ff_reverse[ buf[i] ];
00416     }
00417 
00418     init_get_bits(&a->gb, a->bitstream_buffer, buf_size*8);
00419 
00420     for(mb_y=0; mb_y<a->mb_height2; mb_y++){
00421         for(mb_x=0; mb_x<a->mb_width2; mb_x++){
00422             if( decode_mb(a, a->block) <0)
00423                 return -1;
00424 
00425             idct_put(a, mb_x, mb_y);
00426         }
00427     }
00428 
00429     if(a->mb_width2 != a->mb_width){
00430         mb_x= a->mb_width2;
00431         for(mb_y=0; mb_y<a->mb_height2; mb_y++){
00432             if( decode_mb(a, a->block) <0)
00433                 return -1;
00434 
00435             idct_put(a, mb_x, mb_y);
00436         }
00437     }
00438 
00439     if(a->mb_height2 != a->mb_height){
00440         mb_y= a->mb_height2;
00441         for(mb_x=0; mb_x<a->mb_width; mb_x++){
00442             if( decode_mb(a, a->block) <0)
00443                 return -1;
00444 
00445             idct_put(a, mb_x, mb_y);
00446         }
00447     }
00448 #if 0
00449 int i;
00450 printf("%d %d\n", 8*buf_size, get_bits_count(&a->gb));
00451 for(i=get_bits_count(&a->gb); i<8*buf_size; i++){
00452     printf("%d", get_bits1(&a->gb));
00453 }
00454 
00455 for(i=0; i<s->avctx->extradata_size; i++){
00456     printf("%c\n", ((uint8_t*)s->avctx->extradata)[i]);
00457 }
00458 #endif
00459 
00460     *picture= *(AVFrame*)&a->picture;
00461     *data_size = sizeof(AVPicture);
00462 
00463     emms_c();
00464 
00465     return (get_bits_count(&a->gb)+31)/32*4;
00466 }
00467 
00468 #if CONFIG_ASV1_ENCODER || CONFIG_ASV2_ENCODER
00469 static int encode_frame(AVCodecContext *avctx, unsigned char *buf, int buf_size, void *data){
00470     ASV1Context * const a = avctx->priv_data;
00471     AVFrame *pict = data;
00472     AVFrame * const p= (AVFrame*)&a->picture;
00473     int size;
00474     int mb_x, mb_y;
00475 
00476     init_put_bits(&a->pb, buf, buf_size);
00477 
00478     *p = *pict;
00479     p->pict_type= FF_I_TYPE;
00480     p->key_frame= 1;
00481 
00482     for(mb_y=0; mb_y<a->mb_height2; mb_y++){
00483         for(mb_x=0; mb_x<a->mb_width2; mb_x++){
00484             dct_get(a, mb_x, mb_y);
00485             encode_mb(a, a->block);
00486         }
00487     }
00488 
00489     if(a->mb_width2 != a->mb_width){
00490         mb_x= a->mb_width2;
00491         for(mb_y=0; mb_y<a->mb_height2; mb_y++){
00492             dct_get(a, mb_x, mb_y);
00493             encode_mb(a, a->block);
00494         }
00495     }
00496 
00497     if(a->mb_height2 != a->mb_height){
00498         mb_y= a->mb_height2;
00499         for(mb_x=0; mb_x<a->mb_width; mb_x++){
00500             dct_get(a, mb_x, mb_y);
00501             encode_mb(a, a->block);
00502         }
00503     }
00504     emms_c();
00505 
00506     align_put_bits(&a->pb);
00507     while(put_bits_count(&a->pb)&31)
00508         put_bits(&a->pb, 8, 0);
00509 
00510     size= put_bits_count(&a->pb)/32;
00511 
00512     if(avctx->codec_id == CODEC_ID_ASV1)
00513         a->dsp.bswap_buf((uint32_t*)buf, (uint32_t*)buf, size);
00514     else{
00515         int i;
00516         for(i=0; i<4*size; i++)
00517             buf[i]= ff_reverse[ buf[i] ];
00518     }
00519 
00520     return size*4;
00521 }
00522 #endif /* CONFIG_ASV1_ENCODER || CONFIG_ASV2_ENCODER */
00523 
00524 static av_cold void common_init(AVCodecContext *avctx){
00525     ASV1Context * const a = avctx->priv_data;
00526 
00527     dsputil_init(&a->dsp, avctx);
00528 
00529     a->mb_width   = (avctx->width  + 15) / 16;
00530     a->mb_height  = (avctx->height + 15) / 16;
00531     a->mb_width2  = (avctx->width  + 0) / 16;
00532     a->mb_height2 = (avctx->height + 0) / 16;
00533 
00534     avctx->coded_frame= (AVFrame*)&a->picture;
00535     a->avctx= avctx;
00536 }
00537 
00538 static av_cold int decode_init(AVCodecContext *avctx){
00539     ASV1Context * const a = avctx->priv_data;
00540     AVFrame *p= (AVFrame*)&a->picture;
00541     int i;
00542     const int scale= avctx->codec_id == CODEC_ID_ASV1 ? 1 : 2;
00543 
00544     common_init(avctx);
00545     init_vlcs(a);
00546     ff_init_scantable(a->dsp.idct_permutation, &a->scantable, scantab);
00547     avctx->pix_fmt= PIX_FMT_YUV420P;
00548 
00549     a->inv_qscale= ((uint8_t*)avctx->extradata)[0];
00550     if(a->inv_qscale == 0){
00551         av_log(avctx, AV_LOG_ERROR, "illegal qscale 0\n");
00552         if(avctx->codec_id == CODEC_ID_ASV1)
00553             a->inv_qscale= 6;
00554         else
00555             a->inv_qscale= 10;
00556     }
00557 
00558     for(i=0; i<64; i++){
00559         int index= scantab[i];
00560 
00561         a->intra_matrix[i]= 64*scale*ff_mpeg1_default_intra_matrix[index] / a->inv_qscale;
00562     }
00563 
00564     p->qstride= a->mb_width;
00565     p->qscale_table= av_malloc( p->qstride * a->mb_height);
00566     p->quality= (32*scale + a->inv_qscale/2)/a->inv_qscale;
00567     memset(p->qscale_table, p->quality, p->qstride*a->mb_height);
00568 
00569     return 0;
00570 }
00571 
00572 #if CONFIG_ASV1_ENCODER || CONFIG_ASV2_ENCODER
00573 static av_cold int encode_init(AVCodecContext *avctx){
00574     ASV1Context * const a = avctx->priv_data;
00575     int i;
00576     const int scale= avctx->codec_id == CODEC_ID_ASV1 ? 1 : 2;
00577 
00578     common_init(avctx);
00579 
00580     if(avctx->global_quality == 0) avctx->global_quality= 4*FF_QUALITY_SCALE;
00581 
00582     a->inv_qscale= (32*scale*FF_QUALITY_SCALE +  avctx->global_quality/2) / avctx->global_quality;
00583 
00584     avctx->extradata= av_mallocz(8);
00585     avctx->extradata_size=8;
00586     ((uint32_t*)avctx->extradata)[0]= le2me_32(a->inv_qscale);
00587     ((uint32_t*)avctx->extradata)[1]= le2me_32(AV_RL32("ASUS"));
00588 
00589     for(i=0; i<64; i++){
00590         int q= 32*scale*ff_mpeg1_default_intra_matrix[i];
00591         a->q_intra_matrix[i]= ((a->inv_qscale<<16) + q/2) / q;
00592     }
00593 
00594     return 0;
00595 }
00596 #endif /* CONFIG_ASV1_ENCODER || CONFIG_ASV2_ENCODER */
00597 
00598 static av_cold int decode_end(AVCodecContext *avctx){
00599     ASV1Context * const a = avctx->priv_data;
00600 
00601     av_freep(&a->bitstream_buffer);
00602     av_freep(&a->picture.qscale_table);
00603     a->bitstream_buffer_size=0;
00604 
00605     return 0;
00606 }
00607 
00608 AVCodec asv1_decoder = {
00609     "asv1",
00610     CODEC_TYPE_VIDEO,
00611     CODEC_ID_ASV1,
00612     sizeof(ASV1Context),
00613     decode_init,
00614     NULL,
00615     decode_end,
00616     decode_frame,
00617     CODEC_CAP_DR1,
00618     .long_name= NULL_IF_CONFIG_SMALL("ASUS V1"),
00619 };
00620 
00621 AVCodec asv2_decoder = {
00622     "asv2",
00623     CODEC_TYPE_VIDEO,
00624     CODEC_ID_ASV2,
00625     sizeof(ASV1Context),
00626     decode_init,
00627     NULL,
00628     decode_end,
00629     decode_frame,
00630     CODEC_CAP_DR1,
00631     .long_name= NULL_IF_CONFIG_SMALL("ASUS V2"),
00632 };
00633 
00634 #if CONFIG_ASV1_ENCODER
00635 AVCodec asv1_encoder = {
00636     "asv1",
00637     CODEC_TYPE_VIDEO,
00638     CODEC_ID_ASV1,
00639     sizeof(ASV1Context),
00640     encode_init,
00641     encode_frame,
00642     //encode_end,
00643     .pix_fmts= (enum PixelFormat[]){PIX_FMT_YUV420P, PIX_FMT_NONE},
00644     .long_name= NULL_IF_CONFIG_SMALL("ASUS V1"),
00645 };
00646 #endif
00647 
00648 #if CONFIG_ASV2_ENCODER
00649 AVCodec asv2_encoder = {
00650     "asv2",
00651     CODEC_TYPE_VIDEO,
00652     CODEC_ID_ASV2,
00653     sizeof(ASV1Context),
00654     encode_init,
00655     encode_frame,
00656     //encode_end,
00657     .pix_fmts= (enum PixelFormat[]){PIX_FMT_YUV420P, PIX_FMT_NONE},
00658     .long_name= NULL_IF_CONFIG_SMALL("ASUS V2"),
00659 };
00660 #endif

Generated on Tue Nov 4 2014 12:59:21 for ffmpeg by  doxygen 1.7.1