www.pudn.com > ffmpeg_src2007.rar > asv1.c

/* 
 * ASUS V1/V2 codec 
 * Copyright (c) 2003 Michael Niedermayer 
 * 
 * This library 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 of the License, or (at your option) any later version. 
 * 
 * This library 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 this library; if not, write to the Free Software 
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 
 */ 
 
/** 
 * @file asv1.c 
 * ASUS V1/V2 codec. 
 */ 
 
#include "avcodec.h" 
#include "dsputil.h" 
#include "mpegvideo.h" 
 
//#undef NDEBUG 
//#include  
 
#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_8(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 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_bits(pb, 8, level&0xFF); 
    } 
} 
 
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; igb, 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, 
                        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= 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, (uint32_t*)buf, buf_size/4); 
    else{ 
        int i; 
        for(i=0; ibitstream_buffer[i]= ff_reverse[ buf[i] ]; 
    } 
 
    init_get_bits(&a->gb, a->bitstream_buffer, buf_size*8); 
 
    for(mb_y=0; mb_ymb_height2; mb_y++){ 
        for(mb_x=0; mb_xmb_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_ymb_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_xmb_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; iavctx->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; 
} 
 
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= I_TYPE; 
    p->key_frame= 1; 
 
    for(mb_y=0; mb_ymb_height2; mb_y++){ 
        for(mb_x=0; mb_xmb_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_ymb_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_xmb_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; 
} 
 
static 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 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; 
} 
 
static 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(ff_get_fourcc("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; 
} 
 
static 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, 
}; 
 
AVCodec asv2_decoder = { 
    "asv2", 
    CODEC_TYPE_VIDEO, 
    CODEC_ID_ASV2, 
    sizeof(ASV1Context), 
    decode_init, 
    NULL, 
    decode_end, 
    decode_frame, 
    CODEC_CAP_DR1, 
}; 
 
#ifdef CONFIG_ENCODERS 
 
AVCodec asv1_encoder = { 
    "asv1", 
    CODEC_TYPE_VIDEO, 
    CODEC_ID_ASV1, 
    sizeof(ASV1Context), 
    encode_init, 
    encode_frame, 
    //encode_end, 
}; 
 
AVCodec asv2_encoder = { 
    "asv2", 
    CODEC_TYPE_VIDEO, 
    CODEC_ID_ASV2, 
    sizeof(ASV1Context), 
    encode_init, 
    encode_frame, 
    //encode_end, 
}; 
 
#endif //CONFIG_ENCODERS