wmv2enc.c 6.56 KB
Newer Older
1
/*
2
 * Copyright (c) 2002 The FFmpeg Project
3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25
 *
 * 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 "msmpeg4.h"
#include "msmpeg4data.h"
26
#include "h263.h"
27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54
#include "wmv2.h"


static int encode_ext_header(Wmv2Context *w){
    MpegEncContext * const s= &w->s;
    PutBitContext pb;
    int code;

    init_put_bits(&pb, s->avctx->extradata, s->avctx->extradata_size);

    put_bits(&pb, 5, s->avctx->time_base.den / s->avctx->time_base.num); //yes 29.97 -> 29
    put_bits(&pb, 11, FFMIN(s->bit_rate/1024, 2047));

    put_bits(&pb, 1, w->mspel_bit=1);
    put_bits(&pb, 1, s->loop_filter);
    put_bits(&pb, 1, w->abt_flag=1);
    put_bits(&pb, 1, w->j_type_bit=1);
    put_bits(&pb, 1, w->top_left_mv_flag=0);
    put_bits(&pb, 1, w->per_mb_rl_bit=1);
    put_bits(&pb, 3, code=1);

    flush_put_bits(&pb);

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

    return 0;
}

55
static av_cold int wmv2_encode_init(AVCodecContext *avctx){
56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74
    Wmv2Context * const w= avctx->priv_data;

    if(MPV_encode_init(avctx) < 0)
        return -1;

    ff_wmv2_common_init(w);

    avctx->extradata_size= 4;
    avctx->extradata= av_mallocz(avctx->extradata_size + 10);
    encode_ext_header(w);

    return 0;
}

int ff_wmv2_encode_picture_header(MpegEncContext * s, int picture_number)
{
    Wmv2Context * const w= (Wmv2Context*)s;

    put_bits(&s->pb, 1, s->pict_type - 1);
75
    if(s->pict_type == AV_PICTURE_TYPE_I){
76 77 78 79 80 81 82 83 84 85 86 87 88 89
        put_bits(&s->pb, 7, 0);
    }
    put_bits(&s->pb, 5, s->qscale);

    s->dc_table_index = 1;
    s->mv_table_index = 1; /* only if P frame */
    s->per_mb_rl_table = 0;
    s->mspel= 0;
    w->per_mb_abt=0;
    w->abt_type=0;
    w->j_type=0;

    assert(s->flipflop_rounding);

90
    if (s->pict_type == AV_PICTURE_TYPE_I) {
91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193
        assert(s->no_rounding==1);
        if(w->j_type_bit) put_bits(&s->pb, 1, w->j_type);

        if(w->per_mb_rl_bit) put_bits(&s->pb, 1, s->per_mb_rl_table);

        if(!s->per_mb_rl_table){
            ff_msmpeg4_code012(&s->pb, s->rl_chroma_table_index);
            ff_msmpeg4_code012(&s->pb, s->rl_table_index);
        }

        put_bits(&s->pb, 1, s->dc_table_index);

        s->inter_intra_pred= 0;
    }else{
        int cbp_index;

        put_bits(&s->pb, 2, SKIP_TYPE_NONE);

        ff_msmpeg4_code012(&s->pb, cbp_index=0);
        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) put_bits(&s->pb, 1, s->mspel);

        if(w->abt_flag){
            put_bits(&s->pb, 1, w->per_mb_abt^1);
            if(!w->per_mb_abt){
                ff_msmpeg4_code012(&s->pb, w->abt_type);
            }
        }

        if(w->per_mb_rl_bit) put_bits(&s->pb, 1, s->per_mb_rl_table);

        if(!s->per_mb_rl_table){
            ff_msmpeg4_code012(&s->pb, s->rl_table_index);
            s->rl_chroma_table_index = s->rl_table_index;
        }
        put_bits(&s->pb, 1, s->dc_table_index);
        put_bits(&s->pb, 1, s->mv_table_index);

        s->inter_intra_pred= 0;//(s->width*s->height < 320*240 && s->bit_rate<=II_BITRATE);
    }
    s->esc3_level_length= 0;
    s->esc3_run_length= 0;

    return 0;
}

/* Nearly identical to wmv1 but that is just because we do not use the
 * useless M$ crap features. It is duplicated here in case someone wants
 * to add support for these crap features. */
void ff_wmv2_encode_mb(MpegEncContext * s,
                       DCTELEM block[6][64],
                       int motion_x, int motion_y)
{
    Wmv2Context * const w= (Wmv2Context*)s;
    int cbp, coded_cbp, i;
    int pred_x, pred_y;
    uint8_t *coded_block;

    ff_msmpeg4_handle_slices(s);

    if (!s->mb_intra) {
        /* compute cbp */
        cbp = 0;
        for (i = 0; i < 6; i++) {
            if (s->block_last_index[i] >= 0)
                cbp |= 1 << (5 - i);
        }

        put_bits(&s->pb,
                 wmv2_inter_table[w->cbp_table_index][cbp + 64][1],
                 wmv2_inter_table[w->cbp_table_index][cbp + 64][0]);

        /* motion vector */
        h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
        ff_msmpeg4_encode_motion(s, motion_x - pred_x,
                              motion_y - pred_y);
    } else {
        /* compute cbp */
        cbp = 0;
        coded_cbp = 0;
        for (i = 0; i < 6; i++) {
            int val, pred;
            val = (s->block_last_index[i] >= 1);
            cbp |= val << (5 - i);
            if (i < 4) {
                /* predict value for close blocks only for luma */
                pred = ff_msmpeg4_coded_block_pred(s, i, &coded_block);
                *coded_block = val;
                val = val ^ pred;
            }
            coded_cbp |= val << (5 - i);
        }

194
        if (s->pict_type == AV_PICTURE_TYPE_I) {
195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213
            put_bits(&s->pb,
                     ff_msmp4_mb_i_table[coded_cbp][1], ff_msmp4_mb_i_table[coded_cbp][0]);
        } else {
            put_bits(&s->pb,
                     wmv2_inter_table[w->cbp_table_index][cbp][1],
                     wmv2_inter_table[w->cbp_table_index][cbp][0]);
        }
        put_bits(&s->pb, 1, 0);         /* no AC prediction yet */
        if(s->inter_intra_pred){
            s->h263_aic_dir=0;
            put_bits(&s->pb, table_inter_intra[s->h263_aic_dir][1], table_inter_intra[s->h263_aic_dir][0]);
        }
    }

    for (i = 0; i < 6; i++) {
        ff_msmpeg4_encode_block(s, block[i], i);
    }
}

214
AVCodec ff_wmv2_encoder = {
215
    "wmv2",
216
    AVMEDIA_TYPE_VIDEO,
217 218 219 220 221
    CODEC_ID_WMV2,
    sizeof(Wmv2Context),
    wmv2_encode_init,
    MPV_encode_picture,
    MPV_encode_end,
222
    .pix_fmts= (const enum PixelFormat[]){PIX_FMT_YUV420P, PIX_FMT_NONE},
223
    .long_name= NULL_IF_CONFIG_SMALL("Windows Media Video 8"),
224
};