PeerStreamer

/*

 * 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 "put_bits.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_STATIC(&ccp_vlc, VLC_BITS, 17,

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

                 &ccp_tab[0][0], 2, 1, 64);

        INIT_VLC_STATIC(&dc_ccp_vlc, VLC_BITS, 8,

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

                 &dc_ccp_tab[0][0], 2, 1, 64);

        INIT_VLC_STATIC(&ac_ccp_vlc, VLC_BITS, 16,

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

                 &ac_ccp_tab[0][0], 2, 1, 64);

        INIT_VLC_STATIC(&level_vlc,  VLC_BITS, 7,

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

                 &level_tab[0][0], 2, 1, 64);

        INIT_VLC_STATIC(&asv2_level_vlc, ASV2_LEVEL_VLC_BITS, 63,

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

                 &asv2_level_tab[0][0], 2, 1, 1024);

    }

}

//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,

                        AVPacket *avpkt)

{

    const uint8_t *buf = avpkt->data;

    int buf_size = avpkt->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