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ffmpeg / libavcodec / wmv2enc.c @ 2912e87a

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/*
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 * Copyright (c) 2002 The Libav Project
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 *
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 * This file is part of Libav.
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 *
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 * Libav is free software; you can redistribute it and/or
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 * modify it under the terms of the GNU Lesser General Public
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 * License as published by the Free Software Foundation; either
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 * version 2.1 of the License, or (at your option) any later version.
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 *
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 * Libav is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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 * Lesser General Public License for more details.
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 *
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 * You should have received a copy of the GNU Lesser General Public
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 * License along with Libav; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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 */
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#include "avcodec.h"
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#include "dsputil.h"
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#include "mpegvideo.h"
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#include "msmpeg4.h"
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#include "msmpeg4data.h"
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#include "h263.h"
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#include "wmv2.h"
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static int encode_ext_header(Wmv2Context *w){
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    MpegEncContext * const s= &w->s;
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    PutBitContext pb;
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    int code;
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    init_put_bits(&pb, s->avctx->extradata, s->avctx->extradata_size);
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    put_bits(&pb, 5, s->avctx->time_base.den / s->avctx->time_base.num); //yes 29.97 -> 29
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    put_bits(&pb, 11, FFMIN(s->bit_rate/1024, 2047));
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    put_bits(&pb, 1, w->mspel_bit=1);
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    put_bits(&pb, 1, s->loop_filter);
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    put_bits(&pb, 1, w->abt_flag=1);
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    put_bits(&pb, 1, w->j_type_bit=1);
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    put_bits(&pb, 1, w->top_left_mv_flag=0);
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    put_bits(&pb, 1, w->per_mb_rl_bit=1);
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    put_bits(&pb, 3, code=1);
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    flush_put_bits(&pb);
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    s->slice_height = s->mb_height / code;
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    return 0;
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}
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static av_cold int wmv2_encode_init(AVCodecContext *avctx){
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    Wmv2Context * const w= avctx->priv_data;
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    if(MPV_encode_init(avctx) < 0)
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        return -1;
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    ff_wmv2_common_init(w);
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    avctx->extradata_size= 4;
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    avctx->extradata= av_mallocz(avctx->extradata_size + 10);
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    encode_ext_header(w);
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    return 0;
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}
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int ff_wmv2_encode_picture_header(MpegEncContext * s, int picture_number)
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{
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    Wmv2Context * const w= (Wmv2Context*)s;
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    put_bits(&s->pb, 1, s->pict_type - 1);
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    if(s->pict_type == FF_I_TYPE){
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        put_bits(&s->pb, 7, 0);
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    }
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    put_bits(&s->pb, 5, s->qscale);
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    s->dc_table_index = 1;
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    s->mv_table_index = 1; /* only if P frame */
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    s->per_mb_rl_table = 0;
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    s->mspel= 0;
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    w->per_mb_abt=0;
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    w->abt_type=0;
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    w->j_type=0;
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    assert(s->flipflop_rounding);
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    if (s->pict_type == FF_I_TYPE) {
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        assert(s->no_rounding==1);
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        if(w->j_type_bit) put_bits(&s->pb, 1, w->j_type);
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        if(w->per_mb_rl_bit) put_bits(&s->pb, 1, s->per_mb_rl_table);
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        if(!s->per_mb_rl_table){
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            ff_msmpeg4_code012(&s->pb, s->rl_chroma_table_index);
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            ff_msmpeg4_code012(&s->pb, s->rl_table_index);
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        }
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        put_bits(&s->pb, 1, s->dc_table_index);
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        s->inter_intra_pred= 0;
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    }else{
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        int cbp_index;
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        put_bits(&s->pb, 2, SKIP_TYPE_NONE);
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        ff_msmpeg4_code012(&s->pb, cbp_index=0);
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        if(s->qscale <= 10){
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            int map[3]= {0,2,1};
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            w->cbp_table_index= map[cbp_index];
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        }else if(s->qscale <= 20){
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            int map[3]= {1,0,2};
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            w->cbp_table_index= map[cbp_index];
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        }else{
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            int map[3]= {2,1,0};
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            w->cbp_table_index= map[cbp_index];
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        }
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        if(w->mspel_bit) put_bits(&s->pb, 1, s->mspel);
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        if(w->abt_flag){
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            put_bits(&s->pb, 1, w->per_mb_abt^1);
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            if(!w->per_mb_abt){
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                ff_msmpeg4_code012(&s->pb, w->abt_type);
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            }
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        }
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        if(w->per_mb_rl_bit) put_bits(&s->pb, 1, s->per_mb_rl_table);
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        if(!s->per_mb_rl_table){
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            ff_msmpeg4_code012(&s->pb, s->rl_table_index);
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            s->rl_chroma_table_index = s->rl_table_index;
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        }
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        put_bits(&s->pb, 1, s->dc_table_index);
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        put_bits(&s->pb, 1, s->mv_table_index);
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        s->inter_intra_pred= 0;//(s->width*s->height < 320*240 && s->bit_rate<=II_BITRATE);
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    }
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    s->esc3_level_length= 0;
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    s->esc3_run_length= 0;
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    return 0;
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}
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/* Nearly identical to wmv1 but that is just because we do not use the
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 * useless M$ crap features. It is duplicated here in case someone wants
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 * to add support for these crap features. */
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void ff_wmv2_encode_mb(MpegEncContext * s,
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                       DCTELEM block[6][64],
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                       int motion_x, int motion_y)
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{
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    Wmv2Context * const w= (Wmv2Context*)s;
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    int cbp, coded_cbp, i;
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    int pred_x, pred_y;
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    uint8_t *coded_block;
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    ff_msmpeg4_handle_slices(s);
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    if (!s->mb_intra) {
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        /* compute cbp */
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        cbp = 0;
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        for (i = 0; i < 6; i++) {
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            if (s->block_last_index[i] >= 0)
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                cbp |= 1 << (5 - i);
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        }
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        put_bits(&s->pb,
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                 wmv2_inter_table[w->cbp_table_index][cbp + 64][1],
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                 wmv2_inter_table[w->cbp_table_index][cbp + 64][0]);
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        /* motion vector */
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        h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
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        ff_msmpeg4_encode_motion(s, motion_x - pred_x,
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                              motion_y - pred_y);
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    } else {
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        /* compute cbp */
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        cbp = 0;
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        coded_cbp = 0;
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        for (i = 0; i < 6; i++) {
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            int val, pred;
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            val = (s->block_last_index[i] >= 1);
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            cbp |= val << (5 - i);
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            if (i < 4) {
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                /* predict value for close blocks only for luma */
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                pred = ff_msmpeg4_coded_block_pred(s, i, &coded_block);
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                *coded_block = val;
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                val = val ^ pred;
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            }
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            coded_cbp |= val << (5 - i);
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        }
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        if (s->pict_type == FF_I_TYPE) {
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            put_bits(&s->pb,
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                     ff_msmp4_mb_i_table[coded_cbp][1], ff_msmp4_mb_i_table[coded_cbp][0]);
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        } else {
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            put_bits(&s->pb,
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                     wmv2_inter_table[w->cbp_table_index][cbp][1],
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                     wmv2_inter_table[w->cbp_table_index][cbp][0]);
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        }
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        put_bits(&s->pb, 1, 0);         /* no AC prediction yet */
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        if(s->inter_intra_pred){
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            s->h263_aic_dir=0;
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            put_bits(&s->pb, table_inter_intra[s->h263_aic_dir][1], table_inter_intra[s->h263_aic_dir][0]);
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        }
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    }
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    for (i = 0; i < 6; i++) {
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        ff_msmpeg4_encode_block(s, block[i], i);
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    }
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}
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AVCodec ff_wmv2_encoder = {
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    "wmv2",
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    AVMEDIA_TYPE_VIDEO,
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    CODEC_ID_WMV2,
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    sizeof(Wmv2Context),
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    wmv2_encode_init,
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    MPV_encode_picture,
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    MPV_encode_end,
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    .pix_fmts= (const enum PixelFormat[]){PIX_FMT_YUV420P, PIX_FMT_NONE},
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    .long_name= NULL_IF_CONFIG_SMALL("Windows Media Video 8"),
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};