FFmpeg/libavcodec/wmv2.c

/*
 * Copyright (c) 2002 The Libav Project
 *
 * This file is part of Libav.
 *
 * Libav 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.
 *
 * Libav 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 Libav; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

#include "avcodec.h"
#include "mpegvideo.h"
#include "msmpeg4data.h"
#include "simple_idct.h"
#include "wmv2.h"


av_cold void ff_wmv2_common_init(Wmv2Context * w){
    MpegEncContext * const s= &w->s;

    ff_init_scantable(s->dsp.idct_permutation, &w->abt_scantable[0], ff_wmv2_scantableA);
    ff_init_scantable(s->dsp.idct_permutation, &w->abt_scantable[1], ff_wmv2_scantableB);
}

static void wmv2_add_block(Wmv2Context *w, DCTELEM *block1, uint8_t *dst, int stride, int n){
    MpegEncContext * const s= &w->s;

  if (s->block_last_index[n] >= 0) {
    switch(w->abt_type_table[n]){
    case 0:
        s->dsp.idct_add (dst, stride, block1);
        break;
    case 1:
        ff_simple_idct84_add(dst           , stride, block1);
        ff_simple_idct84_add(dst + 4*stride, stride, w->abt_block2[n]);
        s->dsp.clear_block(w->abt_block2[n]);
        break;
    case 2:
        ff_simple_idct48_add(dst           , stride, block1);
        ff_simple_idct48_add(dst + 4       , stride, w->abt_block2[n]);
        s->dsp.clear_block(w->abt_block2[n]);
        break;
    default:
        av_log(s->avctx, AV_LOG_ERROR, "internal error in WMV2 abt\n");
    }
  }
}

void ff_wmv2_add_mb(MpegEncContext *s, DCTELEM block1[6][64], uint8_t *dest_y, uint8_t *dest_cb, uint8_t *dest_cr){
    Wmv2Context * const w= (Wmv2Context*)s;

    wmv2_add_block(w, block1[0], dest_y                    , s->linesize, 0);
    wmv2_add_block(w, block1[1], dest_y + 8                , s->linesize, 1);
    wmv2_add_block(w, block1[2], dest_y +     8*s->linesize, s->linesize, 2);
    wmv2_add_block(w, block1[3], dest_y + 8 + 8*s->linesize, s->linesize, 3);

    if(s->flags&CODEC_FLAG_GRAY) return;

    wmv2_add_block(w, block1[4], dest_cb                   , s->uvlinesize, 4);
    wmv2_add_block(w, block1[5], dest_cr                   , s->uvlinesize, 5);
}

void ff_mspel_motion(MpegEncContext *s,
                               uint8_t *dest_y, uint8_t *dest_cb, uint8_t *dest_cr,
                               uint8_t **ref_picture, op_pixels_func (*pix_op)[4],
                               int motion_x, int motion_y, int h)
{
    Wmv2Context * const w= (Wmv2Context*)s;
    uint8_t *ptr;
    int dxy, offset, mx, my, src_x, src_y, v_edge_pos, linesize, uvlinesize;
    int emu=0;

    dxy = ((motion_y & 1) << 1) | (motion_x & 1);
    dxy = 2*dxy + w->hshift;
    src_x = s->mb_x * 16 + (motion_x >> 1);
    src_y = s->mb_y * 16 + (motion_y >> 1);

    /* WARNING: do no forget half pels */
    v_edge_pos = s->v_edge_pos;
    src_x = av_clip(src_x, -16, s->width);
    src_y = av_clip(src_y, -16, s->height);

    if(src_x<=-16 || src_x >= s->width)
        dxy &= ~3;
    if(src_y<=-16 || src_y >= s->height)
        dxy &= ~4;

    linesize   = s->linesize;
    uvlinesize = s->uvlinesize;
    ptr = ref_picture[0] + (src_y * linesize) + src_x;

    if(s->flags&CODEC_FLAG_EMU_EDGE){
        if(src_x<1 || src_y<1 || src_x + 17  >= s->h_edge_pos
                              || src_y + h+1 >= v_edge_pos){
            s->dsp.emulated_edge_mc(s->edge_emu_buffer, ptr - 1 - s->linesize, s->linesize, 19, 19,
                             src_x-1, src_y-1, s->h_edge_pos, s->v_edge_pos);
            ptr= s->edge_emu_buffer + 1 + s->linesize;
            emu=1;
        }
    }

    s->dsp.put_mspel_pixels_tab[dxy](dest_y             , ptr             , linesize);
    s->dsp.put_mspel_pixels_tab[dxy](dest_y+8           , ptr+8           , linesize);
    s->dsp.put_mspel_pixels_tab[dxy](dest_y  +8*linesize, ptr  +8*linesize, linesize);
    s->dsp.put_mspel_pixels_tab[dxy](dest_y+8+8*linesize, ptr+8+8*linesize, linesize);

    if(s->flags&CODEC_FLAG_GRAY) return;

    if (s->out_format == FMT_H263) {
        dxy = 0;
        if ((motion_x & 3) != 0)
            dxy |= 1;
        if ((motion_y & 3) != 0)
            dxy |= 2;
        mx = motion_x >> 2;
        my = motion_y >> 2;
    } else {
        mx = motion_x / 2;
        my = motion_y / 2;
        dxy = ((my & 1) << 1) | (mx & 1);
        mx >>= 1;
        my >>= 1;
    }

    src_x = s->mb_x * 8 + mx;
    src_y = s->mb_y * 8 + my;
    src_x = av_clip(src_x, -8, s->width >> 1);
    if (src_x == (s->width >> 1))
        dxy &= ~1;
    src_y = av_clip(src_y, -8, s->height >> 1);
    if (src_y == (s->height >> 1))
        dxy &= ~2;
    offset = (src_y * uvlinesize) + src_x;
    ptr = ref_picture[1] + offset;
    if(emu){
        s->dsp.emulated_edge_mc(s->edge_emu_buffer, ptr, s->uvlinesize, 9, 9,
                         src_x, src_y, s->h_edge_pos>>1, s->v_edge_pos>>1);
        ptr= s->edge_emu_buffer;
    }
    pix_op[1][dxy](dest_cb, ptr, uvlinesize, h >> 1);

    ptr = ref_picture[2] + offset;
    if(emu){
        s->dsp.emulated_edge_mc(s->edge_emu_buffer, ptr, s->uvlinesize, 9, 9,
                         src_x, src_y, s->h_edge_pos>>1, s->v_edge_pos>>1);
        ptr= s->edge_emu_buffer;
    }
    pix_op[1][dxy](dest_cr, ptr, uvlinesize, h >> 1);
}