ffmpeg / libavcodec / wmv2.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 021101301 USA

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*/

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#include "avcodec.h" 
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#include "mpegvideo.h" 
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#include "msmpeg4data.h" 
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#include "simple_idct.h" 
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#include "wmv2.h" 
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av_cold void ff_wmv2_common_init(Wmv2Context * w){

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MpegEncContext * const s= &w>s;

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ff_init_scantable(s>dsp.idct_permutation, &w>abt_scantable[0], wmv2_scantableA);

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ff_init_scantable(s>dsp.idct_permutation, &w>abt_scantable[1], wmv2_scantableB);

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

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if (s>block_last_index[n] >= 0) { 
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switch(w>abt_type_table[n]){

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case 0: 
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s>dsp.idct_add (dst, stride, block1); 
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break;

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case 1: 
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ff_simple_idct84_add(dst , stride, block1); 
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ff_simple_idct84_add(dst + 4*stride, stride, w>abt_block2[n]);

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s>dsp.clear_block(w>abt_block2[n]); 
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break;

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case 2: 
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ff_simple_idct48_add(dst , stride, block1); 
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ff_simple_idct48_add(dst + 4 , stride, w>abt_block2[n]);

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s>dsp.clear_block(w>abt_block2[n]); 
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break;

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default:

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av_log(s>avctx, AV_LOG_ERROR, "internal error in WMV2 abt\n");

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

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wmv2_add_block(w, block1[0], dest_y , s>linesize, 0); 
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wmv2_add_block(w, block1[1], dest_y + 8 , s>linesize, 1); 
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wmv2_add_block(w, block1[2], dest_y + 8*s>linesize, s>linesize, 2); 
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wmv2_add_block(w, block1[3], dest_y + 8 + 8*s>linesize, s>linesize, 3); 
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if(s>flags&CODEC_FLAG_GRAY) return; 
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wmv2_add_block(w, block1[4], dest_cb , s>uvlinesize, 4); 
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wmv2_add_block(w, block1[5], dest_cr , s>uvlinesize, 5); 
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} 
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void ff_mspel_motion(MpegEncContext *s,

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uint8_t *dest_y, uint8_t *dest_cb, uint8_t *dest_cr, 
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uint8_t **ref_picture, op_pixels_func (*pix_op)[4],

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int motion_x, int motion_y, int h) 
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{ 
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Wmv2Context * const w= (Wmv2Context*)s;

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uint8_t *ptr; 
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int dxy, offset, mx, my, src_x, src_y, v_edge_pos, linesize, uvlinesize;

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int emu=0; 
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dxy = ((motion_y & 1) << 1)  (motion_x & 1); 
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dxy = 2*dxy + w>hshift;

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src_x = s>mb_x * 16 + (motion_x >> 1); 
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src_y = s>mb_y * 16 + (motion_y >> 1); 
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/* WARNING: do no forget half pels */

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v_edge_pos = s>v_edge_pos; 
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src_x = av_clip(src_x, 16, s>width);

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src_y = av_clip(src_y, 16, s>height);

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if(src_x<=16  src_x >= s>width) 
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dxy &= ~3;

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if(src_y<=16  src_y >= s>height) 
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dxy &= ~4;

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

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if(s>flags&CODEC_FLAG_EMU_EDGE){

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if(src_x<1  src_y<1  src_x + 17 >= s>h_edge_pos 
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 src_y + h+1 >= v_edge_pos){

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s>dsp.emulated_edge_mc(s>edge_emu_buffer, ptr  1  s>linesize, s>linesize, 19, 19, 
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src_x1, src_y1, s>h_edge_pos, s>v_edge_pos); 
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ptr= s>edge_emu_buffer + 1 + s>linesize;

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emu=1;

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} 
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} 
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s>dsp.put_mspel_pixels_tab[dxy](dest_y , ptr , linesize); 
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s>dsp.put_mspel_pixels_tab[dxy](dest_y+8 , ptr+8 , linesize); 
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s>dsp.put_mspel_pixels_tab[dxy](dest_y +8*linesize, ptr +8*linesize, linesize); 
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s>dsp.put_mspel_pixels_tab[dxy](dest_y+8+8*linesize, ptr+8+8*linesize, linesize); 
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if(s>flags&CODEC_FLAG_GRAY) return; 
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if (s>out_format == FMT_H263) {

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dxy = 0;

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if ((motion_x & 3) != 0) 
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dxy = 1;

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if ((motion_y & 3) != 0) 
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dxy = 2;

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mx = motion_x >> 2;

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my = motion_y >> 2;

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} else {

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mx = motion_x / 2;

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my = motion_y / 2;

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dxy = ((my & 1) << 1)  (mx & 1); 
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mx >>= 1;

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my >>= 1;

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} 
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src_x = s>mb_x * 8 + mx;

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src_y = s>mb_y * 8 + my;

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src_x = av_clip(src_x, 8, s>width >> 1); 
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if (src_x == (s>width >> 1)) 
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dxy &= ~1;

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src_y = av_clip(src_y, 8, s>height >> 1); 
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if (src_y == (s>height >> 1)) 
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dxy &= ~2;

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offset = (src_y * uvlinesize) + src_x; 
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ptr = ref_picture[1] + offset;

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if(emu){

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

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if(emu){

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s>dsp.emulated_edge_mc(s>edge_emu_buffer, ptr, s>uvlinesize, 9, 9, 
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src_x, src_y, s>h_edge_pos>>1, s>v_edge_pos>>1); 
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ptr= s>edge_emu_buffer; 
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} 
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pix_op[1][dxy](dest_cr, ptr, uvlinesize, h >> 1); 
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} 