/*

  * ASUS V1/V2 codec

  * Copyright (c) 2003 Michael Niedermayer
  *

  * This file is part of FFmpeg.
  *
  * FFmpeg is free software; you can redistribute it and/or

  * modify it under the terms of the GNU Lesser General Public
  * License as published by the Free Software Foundation; either

  * version 2.1 of the License, or (at your option) any later version.

  *

  * FFmpeg is distributed in the hope that it will be useful,

  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Lesser General Public License for more details.
  *
  * You should have received a copy of the GNU Lesser General Public

  * License along with FFmpeg; if not, write to the Free Software

  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

  */

 /**

  * @file libavcodec/asv1.c

  * ASUS V1/V2 codec.

  */

 #include "avcodec.h"

 #include "bitstream.h"

 #include "dsputil.h"

 #include "mpeg12data.h"

 
 //#undef NDEBUG
 //#include <assert.h>
 

 #define VLC_BITS 6
 #define ASV2_LEVEL_VLC_BITS 10

 typedef struct ASV1Context{
     AVCodecContext *avctx;
     DSPContext dsp;
     AVFrame picture;
     PutBitContext pb;
     GetBitContext gb;
     ScanTable scantable;
     int inv_qscale;
     int mb_width;
     int mb_height;
     int mb_width2;
     int mb_height2;

     DECLARE_ALIGNED_16(DCTELEM, block[6][64]);

     DECLARE_ALIGNED_8(uint16_t, intra_matrix[64]);
     DECLARE_ALIGNED_8(int, q_intra_matrix[64]);

     uint8_t *bitstream_buffer;

     unsigned int bitstream_buffer_size;

 } ASV1Context;
 
 static const uint8_t scantab[64]={
     0x00,0x08,0x01,0x09,0x10,0x18,0x11,0x19,
     0x02,0x0A,0x03,0x0B,0x12,0x1A,0x13,0x1B,
     0x04,0x0C,0x05,0x0D,0x20,0x28,0x21,0x29,
     0x06,0x0E,0x07,0x0F,0x14,0x1C,0x15,0x1D,
     0x22,0x2A,0x23,0x2B,0x30,0x38,0x31,0x39,

     0x16,0x1E,0x17,0x1F,0x24,0x2C,0x25,0x2D,
     0x32,0x3A,0x33,0x3B,0x26,0x2E,0x27,0x2F,
     0x34,0x3C,0x35,0x3D,0x36,0x3E,0x37,0x3F,
 };
 
 

 static const uint8_t ccp_tab[17][2]={

     {0x2,2}, {0x7,5}, {0xB,5}, {0x3,5},
     {0xD,5}, {0x5,5}, {0x9,5}, {0x1,5},

     {0xE,5}, {0x6,5}, {0xA,5}, {0x2,5},

     {0xC,5}, {0x4,5}, {0x8,5}, {0x3,2},

     {0xF,5}, //EOB
 };
 
 static const uint8_t level_tab[7][2]={
     {3,4}, {3,3}, {3,2}, {0,3}, {2,2}, {2,3}, {2,4}
 };
 

 static const uint8_t dc_ccp_tab[8][2]={
     {0x1,2}, {0xD,4}, {0xF,4}, {0xC,4},
     {0x5,3}, {0xE,4}, {0x4,3}, {0x0,2},
 };
 
 static const uint8_t ac_ccp_tab[16][2]={
     {0x00,2}, {0x3B,6}, {0x0A,4}, {0x3A,6},
     {0x02,3}, {0x39,6}, {0x3C,6}, {0x38,6},
     {0x03,3}, {0x3D,6}, {0x08,4}, {0x1F,5},
     {0x09,4}, {0x0B,4}, {0x0D,4}, {0x0C,4},
 };
 
 static const uint8_t asv2_level_tab[63][2]={
     {0x3F,10},{0x2F,10},{0x37,10},{0x27,10},{0x3B,10},{0x2B,10},{0x33,10},{0x23,10},
     {0x3D,10},{0x2D,10},{0x35,10},{0x25,10},{0x39,10},{0x29,10},{0x31,10},{0x21,10},
     {0x1F, 8},{0x17, 8},{0x1B, 8},{0x13, 8},{0x1D, 8},{0x15, 8},{0x19, 8},{0x11, 8},
     {0x0F, 6},{0x0B, 6},{0x0D, 6},{0x09, 6},
     {0x07, 4},{0x05, 4},
     {0x03, 2},
     {0x00, 5},
     {0x02, 2},
     {0x04, 4},{0x06, 4},
     {0x08, 6},{0x0C, 6},{0x0A, 6},{0x0E, 6},
     {0x10, 8},{0x18, 8},{0x14, 8},{0x1C, 8},{0x12, 8},{0x1A, 8},{0x16, 8},{0x1E, 8},
     {0x20,10},{0x30,10},{0x28,10},{0x38,10},{0x24,10},{0x34,10},{0x2C,10},{0x3C,10},
     {0x22,10},{0x32,10},{0x2A,10},{0x3A,10},{0x26,10},{0x36,10},{0x2E,10},{0x3E,10},
 };
 
 

 static VLC ccp_vlc;
 static VLC level_vlc;

 static VLC dc_ccp_vlc;
 static VLC ac_ccp_vlc;
 static VLC asv2_level_vlc;

 static av_cold void init_vlcs(ASV1Context *a){

     static int done = 0;
 
     if (!done) {
         done = 1;
 

         init_vlc(&ccp_vlc, VLC_BITS, 17,

                  &ccp_tab[0][1], 2, 1,

                  &ccp_tab[0][0], 2, 1, 1);

         init_vlc(&dc_ccp_vlc, VLC_BITS, 8,

                  &dc_ccp_tab[0][1], 2, 1,

                  &dc_ccp_tab[0][0], 2, 1, 1);

         init_vlc(&ac_ccp_vlc, VLC_BITS, 16,

                  &ac_ccp_tab[0][1], 2, 1,

                  &ac_ccp_tab[0][0], 2, 1, 1);

         init_vlc(&level_vlc,  VLC_BITS, 7,

                  &level_tab[0][1], 2, 1,

                  &level_tab[0][0], 2, 1, 1);

         init_vlc(&asv2_level_vlc, ASV2_LEVEL_VLC_BITS, 63,

                  &asv2_level_tab[0][1], 2, 1,

                  &asv2_level_tab[0][0], 2, 1, 1);

     }
 }
 

 //FIXME write a reversed bitstream reader to avoid the double reverse
 static inline int asv2_get_bits(GetBitContext *gb, int n){

     return ff_reverse[ get_bits(gb, n) << (8-n) ];

 }
 

 static inline void asv2_put_bits(PutBitContext *pb, int n, int v){

     put_bits(pb, n, ff_reverse[ v << (8-n) ]);

 }
 

 static inline int asv1_get_level(GetBitContext *gb){

     int code= get_vlc2(gb, level_vlc.table, VLC_BITS, 1);
 
     if(code==3) return get_sbits(gb, 8);
     else        return code - 3;
 }
 

 static inline int asv2_get_level(GetBitContext *gb){
     int code= get_vlc2(gb, asv2_level_vlc.table, ASV2_LEVEL_VLC_BITS, 1);
 
     if(code==31) return (int8_t)asv2_get_bits(gb, 8);
     else         return code - 31;
 }
 
 static inline void asv1_put_level(PutBitContext *pb, int level){

     unsigned int index= level + 3;
 
     if(index <= 6) put_bits(pb, level_tab[index][1], level_tab[index][0]);
     else{
         put_bits(pb, level_tab[3][1], level_tab[3][0]);

         put_sbits(pb, 8, level);

     }
 }
 

 static inline void asv2_put_level(PutBitContext *pb, int level){
     unsigned int index= level + 31;
 
     if(index <= 62) put_bits(pb, asv2_level_tab[index][1], asv2_level_tab[index][0]);
     else{
         put_bits(pb, asv2_level_tab[31][1], asv2_level_tab[31][0]);
         asv2_put_bits(pb, 8, level&0xFF);
     }
 }
 

 static inline int asv1_decode_block(ASV1Context *a, DCTELEM block[64]){

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

     for(i=0; i<11; i++){
         const int ccp= get_vlc2(&a->gb, ccp_vlc.table, VLC_BITS, 1);
 
         if(ccp){
             if(ccp == 16) break;
             if(ccp < 0 || i>=10){

                 av_log(a->avctx, AV_LOG_ERROR, "coded coeff pattern damaged\n");

                 return -1;
             }
 

             if(ccp&8) block[a->scantable.permutated[4*i+0]]= (asv1_get_level(&a->gb) * a->intra_matrix[4*i+0])>>4;
             if(ccp&4) block[a->scantable.permutated[4*i+1]]= (asv1_get_level(&a->gb) * a->intra_matrix[4*i+1])>>4;
             if(ccp&2) block[a->scantable.permutated[4*i+2]]= (asv1_get_level(&a->gb) * a->intra_matrix[4*i+2])>>4;
             if(ccp&1) block[a->scantable.permutated[4*i+3]]= (asv1_get_level(&a->gb) * a->intra_matrix[4*i+3])>>4;

         }
     }
 
     return 0;
 }
 

 static inline int asv2_decode_block(ASV1Context *a, DCTELEM block[64]){
     int i, count, ccp;
 
     count= asv2_get_bits(&a->gb, 4);

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

     ccp= get_vlc2(&a->gb, dc_ccp_vlc.table, VLC_BITS, 1);
     if(ccp){
         if(ccp&4) block[a->scantable.permutated[1]]= (asv2_get_level(&a->gb) * a->intra_matrix[1])>>4;
         if(ccp&2) block[a->scantable.permutated[2]]= (asv2_get_level(&a->gb) * a->intra_matrix[2])>>4;
         if(ccp&1) block[a->scantable.permutated[3]]= (asv2_get_level(&a->gb) * a->intra_matrix[3])>>4;
     }
 
     for(i=1; i<count+1; i++){
         const int ccp= get_vlc2(&a->gb, ac_ccp_vlc.table, VLC_BITS, 1);
 
         if(ccp){
             if(ccp&8) block[a->scantable.permutated[4*i+0]]= (asv2_get_level(&a->gb) * a->intra_matrix[4*i+0])>>4;
             if(ccp&4) block[a->scantable.permutated[4*i+1]]= (asv2_get_level(&a->gb) * a->intra_matrix[4*i+1])>>4;
             if(ccp&2) block[a->scantable.permutated[4*i+2]]= (asv2_get_level(&a->gb) * a->intra_matrix[4*i+2])>>4;
             if(ccp&1) block[a->scantable.permutated[4*i+3]]= (asv2_get_level(&a->gb) * a->intra_matrix[4*i+3])>>4;
         }
     }

     return 0;
 }
 

 static inline void asv1_encode_block(ASV1Context *a, DCTELEM block[64]){

     int i;
     int nc_count=0;

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

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

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

 
         if(ccp){

             for(;nc_count; nc_count--)

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

             if(ccp&8) asv1_put_level(&a->pb, block[index + 0]);
             if(ccp&4) asv1_put_level(&a->pb, block[index + 8]);
             if(ccp&2) asv1_put_level(&a->pb, block[index + 1]);
             if(ccp&1) asv1_put_level(&a->pb, block[index + 9]);

         }else{
             nc_count++;
         }
     }
     put_bits(&a->pb, ccp_tab[16][1], ccp_tab[16][0]);
 }
 

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

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

         if( (block[index]*a->q_intra_matrix[index] + (1<<15))>>16 )

             break;
     }

     count >>= 2;
 
     asv2_put_bits(&a->pb, 4, count);
     asv2_put_bits(&a->pb, 8, (block[0] + 32)>>6);
     block[0]= 0;

     for(i=0; i<=count; i++){
         const int index= scantab[4*i];
         int ccp=0;
 
         if( (block[index + 0] = (block[index + 0]*a->q_intra_matrix[index + 0] + (1<<15))>>16) ) ccp |= 8;
         if( (block[index + 8] = (block[index + 8]*a->q_intra_matrix[index + 8] + (1<<15))>>16) ) ccp |= 4;
         if( (block[index + 1] = (block[index + 1]*a->q_intra_matrix[index + 1] + (1<<15))>>16) ) ccp |= 2;
         if( (block[index + 9] = (block[index + 9]*a->q_intra_matrix[index + 9] + (1<<15))>>16) ) ccp |= 1;
 

         assert(i || ccp<8);

         if(i) put_bits(&a->pb, ac_ccp_tab[ccp][1], ac_ccp_tab[ccp][0]);
         else  put_bits(&a->pb, dc_ccp_tab[ccp][1], dc_ccp_tab[ccp][0]);
 
         if(ccp){
             if(ccp&8) asv2_put_level(&a->pb, block[index + 0]);
             if(ccp&4) asv2_put_level(&a->pb, block[index + 8]);
             if(ccp&2) asv2_put_level(&a->pb, block[index + 1]);
             if(ccp&1) asv2_put_level(&a->pb, block[index + 9]);
         }
     }
 }
 

 static inline int decode_mb(ASV1Context *a, DCTELEM block[6][64]){
     int i;
 
     a->dsp.clear_blocks(block[0]);

     if(a->avctx->codec_id == CODEC_ID_ASV1){
         for(i=0; i<6; i++){

             if( asv1_decode_block(a, block[i]) < 0)

                 return -1;
         }
     }else{
         for(i=0; i<6; i++){

             if( asv2_decode_block(a, block[i]) < 0)

                 return -1;
         }

     }
     return 0;
 }
 

 static inline int encode_mb(ASV1Context *a, DCTELEM block[6][64]){

     int i;

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

     if(a->avctx->codec_id == CODEC_ID_ASV1){
         for(i=0; i<6; i++)
             asv1_encode_block(a, block[i]);
     }else{
         for(i=0; i<6; i++)
             asv2_encode_block(a, block[i]);

     }

     return 0;

 }

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

     uint8_t *dest_y  = a->picture.data[0] + (mb_y * 16* linesize              ) + mb_x * 16;
     uint8_t *dest_cb = a->picture.data[1] + (mb_y * 8 * a->picture.linesize[1]) + mb_x * 8;
     uint8_t *dest_cr = a->picture.data[2] + (mb_y * 8 * a->picture.linesize[2]) + mb_x * 8;
 
     a->dsp.idct_put(dest_y                 , linesize, block[0]);
     a->dsp.idct_put(dest_y              + 8, linesize, block[1]);
     a->dsp.idct_put(dest_y + 8*linesize    , linesize, block[2]);
     a->dsp.idct_put(dest_y + 8*linesize + 8, linesize, block[3]);
 
     if(!(a->avctx->flags&CODEC_FLAG_GRAY)){
         a->dsp.idct_put(dest_cb, a->picture.linesize[1], block[4]);
         a->dsp.idct_put(dest_cr, a->picture.linesize[2], block[5]);
     }
 }
 
 static inline void dct_get(ASV1Context *a, int mb_x, int mb_y){
     DCTELEM (*block)[64]= a->block;
     int linesize= a->picture.linesize[0];
     int i;

     uint8_t *ptr_y  = a->picture.data[0] + (mb_y * 16* linesize              ) + mb_x * 16;
     uint8_t *ptr_cb = a->picture.data[1] + (mb_y * 8 * a->picture.linesize[1]) + mb_x * 8;
     uint8_t *ptr_cr = a->picture.data[2] + (mb_y * 8 * a->picture.linesize[2]) + mb_x * 8;
 
     a->dsp.get_pixels(block[0], ptr_y                 , linesize);
     a->dsp.get_pixels(block[1], ptr_y              + 8, linesize);
     a->dsp.get_pixels(block[2], ptr_y + 8*linesize    , linesize);
     a->dsp.get_pixels(block[3], ptr_y + 8*linesize + 8, linesize);
     for(i=0; i<4; i++)
         a->dsp.fdct(block[i]);

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

 static int decode_frame(AVCodecContext *avctx,

                         void *data, int *data_size,

                         const uint8_t *buf, int buf_size)

 {
     ASV1Context * const a = avctx->priv_data;
     AVFrame *picture = data;
     AVFrame * const p= (AVFrame*)&a->picture;
     int mb_x, mb_y;
 
     if(p->data[0])
         avctx->release_buffer(avctx, p);
 
     p->reference= 0;
     if(avctx->get_buffer(avctx, p) < 0){

         av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");

         return -1;
     }

     p->pict_type= FF_I_TYPE;

     p->key_frame= 1;
 
     a->bitstream_buffer= av_fast_realloc(a->bitstream_buffer, &a->bitstream_buffer_size, buf_size + FF_INPUT_BUFFER_PADDING_SIZE);

     if(avctx->codec_id == CODEC_ID_ASV1)

         a->dsp.bswap_buf((uint32_t*)a->bitstream_buffer, (const uint32_t*)buf, buf_size/4);

     else{
         int i;
         for(i=0; i<buf_size; i++)

             a->bitstream_buffer[i]= ff_reverse[ buf[i] ];

     }
 

     init_get_bits(&a->gb, a->bitstream_buffer, buf_size*8);
 
     for(mb_y=0; mb_y<a->mb_height2; mb_y++){
         for(mb_x=0; mb_x<a->mb_width2; mb_x++){
             if( decode_mb(a, a->block) <0)
                 return -1;

             idct_put(a, mb_x, mb_y);
         }
     }
 
     if(a->mb_width2 != a->mb_width){
         mb_x= a->mb_width2;
         for(mb_y=0; mb_y<a->mb_height2; mb_y++){
             if( decode_mb(a, a->block) <0)
                 return -1;

             idct_put(a, mb_x, mb_y);
         }
     }
 
     if(a->mb_height2 != a->mb_height){
         mb_y= a->mb_height2;
         for(mb_x=0; mb_x<a->mb_width; mb_x++){
             if( decode_mb(a, a->block) <0)
                 return -1;

             idct_put(a, mb_x, mb_y);
         }
     }

 #if 0

 int i;
 printf("%d %d\n", 8*buf_size, get_bits_count(&a->gb));
 for(i=get_bits_count(&a->gb); i<8*buf_size; i++){
     printf("%d", get_bits1(&a->gb));
 }
 
 for(i=0; i<s->avctx->extradata_size; i++){
     printf("%c\n", ((uint8_t*)s->avctx->extradata)[i]);
 }
 #endif
 
     *picture= *(AVFrame*)&a->picture;
     *data_size = sizeof(AVPicture);
 
     emms_c();

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

 #if CONFIG_ASV1_ENCODER || CONFIG_ASV2_ENCODER

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

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

     *p = *pict;

     p->pict_type= FF_I_TYPE;

     p->key_frame= 1;
 
     for(mb_y=0; mb_y<a->mb_height2; mb_y++){
         for(mb_x=0; mb_x<a->mb_width2; mb_x++){
             dct_get(a, mb_x, mb_y);
             encode_mb(a, a->block);
         }
     }
 
     if(a->mb_width2 != a->mb_width){
         mb_x= a->mb_width2;
         for(mb_y=0; mb_y<a->mb_height2; mb_y++){
             dct_get(a, mb_x, mb_y);
             encode_mb(a, a->block);
         }
     }
 
     if(a->mb_height2 != a->mb_height){
         mb_y= a->mb_height2;
         for(mb_x=0; mb_x<a->mb_width; mb_x++){
             dct_get(a, mb_x, mb_y);
             encode_mb(a, a->block);
         }
     }
     emms_c();

     align_put_bits(&a->pb);

     while(put_bits_count(&a->pb)&31)

         put_bits(&a->pb, 8, 0);

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

     if(avctx->codec_id == CODEC_ID_ASV1)
         a->dsp.bswap_buf((uint32_t*)buf, (uint32_t*)buf, size);
     else{
         int i;
         for(i=0; i<4*size; i++)

             buf[i]= ff_reverse[ buf[i] ];

     }

     return size*4;
 }

 #endif /* CONFIG_ASV1_ENCODER || CONFIG_ASV2_ENCODER */

 static av_cold void common_init(AVCodecContext *avctx){

     ASV1Context * const a = avctx->priv_data;
 
     dsputil_init(&a->dsp, avctx);
 
     a->mb_width   = (avctx->width  + 15) / 16;
     a->mb_height  = (avctx->height + 15) / 16;
     a->mb_width2  = (avctx->width  + 0) / 16;
     a->mb_height2 = (avctx->height + 0) / 16;
 
     avctx->coded_frame= (AVFrame*)&a->picture;
     a->avctx= avctx;
 }
 

 static av_cold int decode_init(AVCodecContext *avctx){

     ASV1Context * const a = avctx->priv_data;
     AVFrame *p= (AVFrame*)&a->picture;
     int i;

     const int scale= avctx->codec_id == CODEC_ID_ASV1 ? 1 : 2;

     common_init(avctx);
     init_vlcs(a);
     ff_init_scantable(a->dsp.idct_permutation, &a->scantable, scantab);

     avctx->pix_fmt= PIX_FMT_YUV420P;

     a->inv_qscale= ((uint8_t*)avctx->extradata)[0];

     if(a->inv_qscale == 0){

         av_log(avctx, AV_LOG_ERROR, "illegal qscale 0\n");

         if(avctx->codec_id == CODEC_ID_ASV1)
             a->inv_qscale= 6;
         else
             a->inv_qscale= 10;

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

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

     }
 
     p->qstride= a->mb_width;

     p->qscale_table= av_malloc( p->qstride * a->mb_height);

     p->quality= (32*scale + a->inv_qscale/2)/a->inv_qscale;
     memset(p->qscale_table, p->quality, p->qstride*a->mb_height);

 
     return 0;
 }
 

 #if CONFIG_ASV1_ENCODER || CONFIG_ASV2_ENCODER

 static av_cold int encode_init(AVCodecContext *avctx){

     ASV1Context * const a = avctx->priv_data;
     int i;

     const int scale= avctx->codec_id == CODEC_ID_ASV1 ? 1 : 2;
 

     common_init(avctx);

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

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

     avctx->extradata= av_mallocz(8);
     avctx->extradata_size=8;
     ((uint32_t*)avctx->extradata)[0]= le2me_32(a->inv_qscale);

     ((uint32_t*)avctx->extradata)[1]= le2me_32(AV_RL32("ASUS"));

     for(i=0; i<64; i++){

         int q= 32*scale*ff_mpeg1_default_intra_matrix[i];

         a->q_intra_matrix[i]= ((a->inv_qscale<<16) + q/2) / q;
     }
 
     return 0;
 }

 #endif /* CONFIG_ASV1_ENCODER || CONFIG_ASV2_ENCODER */

 static av_cold int decode_end(AVCodecContext *avctx){

     ASV1Context * const a = avctx->priv_data;
 
     av_freep(&a->bitstream_buffer);
     av_freep(&a->picture.qscale_table);
     a->bitstream_buffer_size=0;

     return 0;
 }
 
 AVCodec asv1_decoder = {
     "asv1",
     CODEC_TYPE_VIDEO,
     CODEC_ID_ASV1,
     sizeof(ASV1Context),
     decode_init,
     NULL,
     decode_end,
     decode_frame,
     CODEC_CAP_DR1,

     .long_name= NULL_IF_CONFIG_SMALL("ASUS V1"),

 };
 

 AVCodec asv2_decoder = {
     "asv2",
     CODEC_TYPE_VIDEO,
     CODEC_ID_ASV2,
     sizeof(ASV1Context),
     decode_init,
     NULL,
     decode_end,
     decode_frame,
     CODEC_CAP_DR1,

     .long_name= NULL_IF_CONFIG_SMALL("ASUS V2"),

 };
 

 #if CONFIG_ASV1_ENCODER

 AVCodec asv1_encoder = {
     "asv1",
     CODEC_TYPE_VIDEO,
     CODEC_ID_ASV1,
     sizeof(ASV1Context),
     encode_init,
     encode_frame,
     //encode_end,

     .pix_fmts= (enum PixelFormat[]){PIX_FMT_YUV420P, PIX_FMT_NONE},

     .long_name= NULL_IF_CONFIG_SMALL("ASUS V1"),

 };

 #endif

 #if CONFIG_ASV2_ENCODER

 AVCodec asv2_encoder = {
     "asv2",
     CODEC_TYPE_VIDEO,
     CODEC_ID_ASV2,
     sizeof(ASV1Context),
     encode_init,
     encode_frame,
     //encode_end,

     .pix_fmts= (enum PixelFormat[]){PIX_FMT_YUV420P, PIX_FMT_NONE},

     .long_name= NULL_IF_CONFIG_SMALL("ASUS V2"),

 };

 #endif