PeerStreamer

/*

 * Copyright (c) 2002 The FFmpeg Project

 *

 * 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

 */

#include "avcodec.h"

#include "dsputil.h"

#include "mpegvideo.h"

#include "h263.h"

#include "mathops.h"

#include "msmpeg4.h"

#include "msmpeg4data.h"

#include "intrax8.h"

#include "wmv2.h"

static void parse_mb_skip(Wmv2Context * w){

    int mb_x, mb_y;

    MpegEncContext * const s= &w->s;

    uint32_t * const mb_type= s->current_picture_ptr->mb_type;

    w->skip_type= get_bits(&s->gb, 2);

    switch(w->skip_type){

    case SKIP_TYPE_NONE:

        for(mb_y=0; mb_y<s->mb_height; mb_y++){

            for(mb_x=0; mb_x<s->mb_width; mb_x++){

                mb_type[mb_y*s->mb_stride + mb_x]= MB_TYPE_16x16 | MB_TYPE_L0;

            }

        }

        break;

    case SKIP_TYPE_MPEG:

        for(mb_y=0; mb_y<s->mb_height; mb_y++){

            for(mb_x=0; mb_x<s->mb_width; mb_x++){

                mb_type[mb_y*s->mb_stride + mb_x]= (get_bits1(&s->gb) ? MB_TYPE_SKIP : 0) | MB_TYPE_16x16 | MB_TYPE_L0;

            }

        }

        break;

    case SKIP_TYPE_ROW:

        for(mb_y=0; mb_y<s->mb_height; mb_y++){

            if(get_bits1(&s->gb)){

                for(mb_x=0; mb_x<s->mb_width; mb_x++){

                    mb_type[mb_y*s->mb_stride + mb_x]=  MB_TYPE_SKIP | MB_TYPE_16x16 | MB_TYPE_L0;

                }

            }else{

                for(mb_x=0; mb_x<s->mb_width; mb_x++){

                    mb_type[mb_y*s->mb_stride + mb_x]= (get_bits1(&s->gb) ? MB_TYPE_SKIP : 0) | MB_TYPE_16x16 | MB_TYPE_L0;

                }

            }

        }

        break;

    case SKIP_TYPE_COL:

        for(mb_x=0; mb_x<s->mb_width; mb_x++){

            if(get_bits1(&s->gb)){

                for(mb_y=0; mb_y<s->mb_height; mb_y++){

                    mb_type[mb_y*s->mb_stride + mb_x]=  MB_TYPE_SKIP | MB_TYPE_16x16 | MB_TYPE_L0;

                }

            }else{

                for(mb_y=0; mb_y<s->mb_height; mb_y++){

                    mb_type[mb_y*s->mb_stride + mb_x]= (get_bits1(&s->gb) ? MB_TYPE_SKIP : 0) | MB_TYPE_16x16 | MB_TYPE_L0;

                }

            }

        }

        break;

    }

}

static int decode_ext_header(Wmv2Context *w){

    MpegEncContext * const s= &w->s;

    GetBitContext gb;

    int fps;

    int code;

    if(s->avctx->extradata_size<4) return -1;

    init_get_bits(&gb, s->avctx->extradata, 32);

    fps                = get_bits(&gb, 5);

    s->bit_rate        = get_bits(&gb, 11)*1024;

    w->mspel_bit       = get_bits1(&gb);

    s->loop_filter     = get_bits1(&gb);

    w->abt_flag        = get_bits1(&gb);

    w->j_type_bit      = get_bits1(&gb);

    w->top_left_mv_flag= get_bits1(&gb);

    w->per_mb_rl_bit   = get_bits1(&gb);

    code               = get_bits(&gb, 3);

    if(code==0) return -1;

    s->slice_height = s->mb_height / code;

    if(s->avctx->debug&FF_DEBUG_PICT_INFO){

        av_log(s->avctx, AV_LOG_DEBUG, "fps:%d, br:%d, qpbit:%d, abt_flag:%d, j_type_bit:%d, tl_mv_flag:%d, mbrl_bit:%d, code:%d, loop_filter:%d, slices:%d\n",

        fps, s->bit_rate, w->mspel_bit, w->abt_flag, w->j_type_bit, w->top_left_mv_flag, w->per_mb_rl_bit, code, s->loop_filter,

        code);

    }

    return 0;

}

int ff_wmv2_decode_picture_header(MpegEncContext * s)

{

    Wmv2Context * const w= (Wmv2Context*)s;

    int code;

#if 0

{

int i;

for(i=0; i<s->gb.size*8; i++)

    printf("%d", get_bits1(&s->gb));

//    get_bits1(&s->gb);

printf("END\n");

return -1;

}

#endif

    if(s->picture_number==0)

        decode_ext_header(w);

    s->pict_type = get_bits1(&s->gb) + 1;

    if(s->pict_type == FF_I_TYPE){

        code = get_bits(&s->gb, 7);

        av_log(s->avctx, AV_LOG_DEBUG, "I7:%X/\n", code);

    }

    s->chroma_qscale= s->qscale = get_bits(&s->gb, 5);

    if(s->qscale <= 0)

       return -1;

    return 0;

}

int ff_wmv2_decode_secondary_picture_header(MpegEncContext * s)

{

    Wmv2Context * const w= (Wmv2Context*)s;

    if (s->pict_type == FF_I_TYPE) {

        if(w->j_type_bit) w->j_type= get_bits1(&s->gb);

        else              w->j_type= 0; //FIXME check

        if(!w->j_type){

            if(w->per_mb_rl_bit) s->per_mb_rl_table= get_bits1(&s->gb);

            else                 s->per_mb_rl_table= 0;

            if(!s->per_mb_rl_table){

                s->rl_chroma_table_index = decode012(&s->gb);

                s->rl_table_index = decode012(&s->gb);

            }

            s->dc_table_index = get_bits1(&s->gb);

        }

        s->inter_intra_pred= 0;

        s->no_rounding = 1;

        if(s->avctx->debug&FF_DEBUG_PICT_INFO){

            av_log(s->avctx, AV_LOG_DEBUG, "qscale:%d rlc:%d rl:%d dc:%d mbrl:%d j_type:%d \n",

                s->qscale,

                s->rl_chroma_table_index,

                s->rl_table_index,

                s->dc_table_index,

                s->per_mb_rl_table,

                w->j_type);

        }

    }else{

        int cbp_index;

        w->j_type=0;

        parse_mb_skip(w);

        cbp_index= decode012(&s->gb);

        if(s->qscale <= 10){

            int map[3]= {0,2,1};

            w->cbp_table_index= map[cbp_index];

        }else if(s->qscale <= 20){

            int map[3]= {1,0,2};

            w->cbp_table_index= map[cbp_index];

        }else{

            int map[3]= {2,1,0};

            w->cbp_table_index= map[cbp_index];

        }

        if(w->mspel_bit) s->mspel= get_bits1(&s->gb);

        else             s->mspel= 0; //FIXME check

        if(w->abt_flag){

            w->per_mb_abt= get_bits1(&s->gb)^1;

            if(!w->per_mb_abt){

                w->abt_type= decode012(&s->gb);

            }

        }

        if(w->per_mb_rl_bit) s->per_mb_rl_table= get_bits1(&s->gb);

        else                 s->per_mb_rl_table= 0;

        if(!s->per_mb_rl_table){

            s->rl_table_index = decode012(&s->gb);

            s->rl_chroma_table_index = s->rl_table_index;

        }

        s->dc_table_index = get_bits1(&s->gb);

        s->mv_table_index = get_bits1(&s->gb);

        s->inter_intra_pred= 0;//(s->width*s->height < 320*240 && s->bit_rate<=II_BITRATE);

        s->no_rounding ^= 1;

        if(s->avctx->debug&FF_DEBUG_PICT_INFO){

            av_log(s->avctx, AV_LOG_DEBUG, "rl:%d rlc:%d dc:%d mv:%d mbrl:%d qp:%d mspel:%d per_mb_abt:%d abt_type:%d cbp:%d ii:%d\n",

                s->rl_table_index,

                s->rl_chroma_table_index,

                s->dc_table_index,

                s->mv_table_index,

                s->per_mb_rl_table,

                s->qscale,

                s->mspel,

                w->per_mb_abt,

                w->abt_type,

                w->cbp_table_index,

                s->inter_intra_pred);

        }

    }

    s->esc3_level_length= 0;

    s->esc3_run_length= 0;

s->picture_number++; //FIXME ?

    if(w->j_type){

        ff_intrax8_decode_picture(&w->x8, 2*s->qscale, (s->qscale-1)|1 );

        return 1;

    }

    return 0;

}

static inline int wmv2_decode_motion(Wmv2Context *w, int *mx_ptr, int *my_ptr){

    MpegEncContext * const s= &w->s;

    int ret;

    ret= ff_msmpeg4_decode_motion(s, mx_ptr, my_ptr);

    if(ret<0) return -1;

    if((((*mx_ptr)|(*my_ptr)) & 1) && s->mspel)

        w->hshift= get_bits1(&s->gb);

    else

        w->hshift= 0;

//printf("%d %d  ", *mx_ptr, *my_ptr);

    return 0;

}

static int16_t *wmv2_pred_motion(Wmv2Context *w, int *px, int *py){

    MpegEncContext * const s= &w->s;

    int xy, wrap, diff, type;

    int16_t *A, *B, *C, *mot_val;

    wrap = s->b8_stride;

    xy = s->block_index[0];

    mot_val = s->current_picture.motion_val[0][xy];

    A = s->current_picture.motion_val[0][xy - 1];

    B = s->current_picture.motion_val[0][xy - wrap];

    C = s->current_picture.motion_val[0][xy + 2 - wrap];

    if(s->mb_x && !s->first_slice_line && !s->mspel && w->top_left_mv_flag)

        diff= FFMAX(FFABS(A[0] - B[0]), FFABS(A[1] - B[1]));

    else

        diff=0;

    if(diff >= 8)

        type= get_bits1(&s->gb);

    else

        type= 2;

    if(type == 0){

        *px= A[0];

        *py= A[1];

    }else if(type == 1){

        *px= B[0];

        *py= B[1];

    }else{

        /* special case for first (slice) line */

        if (s->first_slice_line) {

            *px = A[0];

            *py = A[1];

        } else {

            *px = mid_pred(A[0], B[0], C[0]);

            *py = mid_pred(A[1], B[1], C[1]);

        }

    }

    return mot_val;

}

static inline int wmv2_decode_inter_block(Wmv2Context *w, DCTELEM *block, int n, int cbp){

    MpegEncContext * const s= &w->s;

    static const int sub_cbp_table[3]= {2,3,1};

    int sub_cbp;

    if(!cbp){

        s->block_last_index[n] = -1;

        return 0;

    }

    if(w->per_block_abt)

        w->abt_type= decode012(&s->gb);

#if 0

    if(w->per_block_abt)

        printf("B%d", w->abt_type);

#endif

    w->abt_type_table[n]= w->abt_type;

    if(w->abt_type){

//        const uint8_t *scantable= w->abt_scantable[w->abt_type-1].permutated;

        const uint8_t *scantable= w->abt_scantable[w->abt_type-1].scantable;

//        const uint8_t *scantable= w->abt_type-1 ? w->abt_scantable[1].permutated : w->abt_scantable[0].scantable;

        sub_cbp= sub_cbp_table[ decode012(&s->gb) ];

//        printf("S%d", sub_cbp);

        if(sub_cbp&1){

            if (ff_msmpeg4_decode_block(s, block, n, 1, scantable) < 0)

                return -1;

        }

        if(sub_cbp&2){

            if (ff_msmpeg4_decode_block(s, w->abt_block2[n], n, 1, scantable) < 0)

                return -1;

        }

        s->block_last_index[n] = 63;

        return 0;

    }else{

        return ff_msmpeg4_decode_block(s, block, n, 1, s->inter_scantable.permutated);

    }

}

int ff_wmv2_decode_mb(MpegEncContext *s, DCTELEM block[6][64])

{

    Wmv2Context * const w= (Wmv2Context*)s;

    int cbp, code, i;

    uint8_t *coded_val;

    if(w->j_type) return 0;

    if (s->pict_type == FF_P_TYPE) {

        if(IS_SKIP(s->current_picture.mb_type[s->mb_y * s->mb_stride + s->mb_x])){

            /* skip mb */

            s->mb_intra = 0;

            for(i=0;i<6;i++)

                s->block_last_index[i] = -1;

            s->mv_dir = MV_DIR_FORWARD;

            s->mv_type = MV_TYPE_16X16;

            s->mv[0][0][0] = 0;

            s->mv[0][0][1] = 0;

            s->mb_skipped = 1;

            w->hshift=0;

            return 0;

        }

        code = get_vlc2(&s->gb, ff_mb_non_intra_vlc[w->cbp_table_index].table, MB_NON_INTRA_VLC_BITS, 3);

        if (code < 0)

            return -1;

        s->mb_intra = (~code & 0x40) >> 6;

        cbp = code & 0x3f;

    } else {

        s->mb_intra = 1;

        code = get_vlc2(&s->gb, ff_msmp4_mb_i_vlc.table, MB_INTRA_VLC_BITS, 2);

        if (code < 0){

            av_log(s->avctx, AV_LOG_ERROR, "II-cbp illegal at %d %d\n", s->mb_x, s->mb_y);

            return -1;

        }

        /* predict coded block pattern */

        cbp = 0;

        for(i=0;i<6;i++) {

            int val = ((code >> (5 - i)) & 1);

            if (i < 4) {

                int pred = ff_msmpeg4_coded_block_pred(s, i, &coded_val);

                val = val ^ pred;

                *coded_val = val;

            }

            cbp |= val << (5 - i);

        }

    }

    if (!s->mb_intra) {

        int mx, my;

//printf("P at %d %d\n", s->mb_x, s->mb_y);

        wmv2_pred_motion(w, &mx, &my);

        if(cbp){

            s->dsp.clear_blocks(s->block[0]);

            if(s->per_mb_rl_table){

                s->rl_table_index = decode012(&s->gb);

                s->rl_chroma_table_index = s->rl_table_index;

            }

            if(w->abt_flag && w->per_mb_abt){

                w->per_block_abt= get_bits1(&s->gb);

                if(!w->per_block_abt)

                    w->abt_type= decode012(&s->gb);

            }else

                w->per_block_abt=0;

        }

        if (wmv2_decode_motion(w, &mx, &my) < 0)

            return -1;

        s->mv_dir = MV_DIR_FORWARD;

        s->mv_type = MV_TYPE_16X16;

        s->mv[0][0][0] = mx;

        s->mv[0][0][1] = my;

        for (i = 0; i < 6; i++) {

            if (wmv2_decode_inter_block(w, block[i], i, (cbp >> (5 - i)) & 1) < 0)

            {

                av_log(s->avctx, AV_LOG_ERROR, "\nerror while decoding inter block: %d x %d (%d)\n", s->mb_x, s->mb_y, i);

                return -1;

            }

        }

    } else {

//if(s->pict_type==FF_P_TYPE)

//   printf("%d%d ", s->inter_intra_pred, cbp);

//printf("I at %d %d %d %06X\n", s->mb_x, s->mb_y, ((cbp&3)? 1 : 0) +((cbp&0x3C)? 2 : 0), show_bits(&s->gb, 24));

        s->ac_pred = get_bits1(&s->gb);

        if(s->inter_intra_pred){

            s->h263_aic_dir= get_vlc2(&s->gb, ff_inter_intra_vlc.table, INTER_INTRA_VLC_BITS, 1);

//            printf("%d%d %d %d/", s->ac_pred, s->h263_aic_dir, s->mb_x, s->mb_y);

        }

        if(s->per_mb_rl_table && cbp){

            s->rl_table_index = decode012(&s->gb);

            s->rl_chroma_table_index = s->rl_table_index;

        }

        s->dsp.clear_blocks(s->block[0]);

        for (i = 0; i < 6; i++) {

            if (ff_msmpeg4_decode_block(s, block[i], i, (cbp >> (5 - i)) & 1, NULL) < 0)

            {

                av_log(s->avctx, AV_LOG_ERROR, "\nerror while decoding intra block: %d x %d (%d)\n", s->mb_x, s->mb_y, i);

                return -1;

            }

        }

    }

    return 0;

}

static av_cold int wmv2_decode_init(AVCodecContext *avctx){

    Wmv2Context * const w= avctx->priv_data;

    if(avctx->idct_algo==FF_IDCT_AUTO){

        avctx->idct_algo=FF_IDCT_WMV2;

    }

    if(ff_msmpeg4_decode_init(avctx) < 0)

        return -1;

    ff_wmv2_common_init(w);

    ff_intrax8_common_init(&w->x8,&w->s);

    return 0;

}

static av_cold int wmv2_decode_end(AVCodecContext *avctx)

{

    Wmv2Context *w = avctx->priv_data;

    ff_intrax8_common_end(&w->x8);

    return ff_h263_decode_end(avctx);

}

AVCodec ff_wmv2_decoder = {

    "wmv2",

    AVMEDIA_TYPE_VIDEO,

    CODEC_ID_WMV2,

    sizeof(Wmv2Context),

    wmv2_decode_init,

    NULL,

    wmv2_decode_end,

    ff_h263_decode_frame,

    CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1,

    .max_lowres = 3,

    .long_name = NULL_IF_CONFIG_SMALL("Windows Media Video 8"),

    .pix_fmts= ff_pixfmt_list_420,

};