338 lines
9.6 KiB
C
338 lines
9.6 KiB
C
/*
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* MSMPEG4 backend for encoder and decoder
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* Copyright (c) 2001 Fabrice Bellard
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* Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>
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*
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* msmpeg4v1 & v2 stuff by Michael Niedermayer <michaelni@gmx.at>
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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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/**
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* @file
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* MSMPEG4 backend for encoder and decoder
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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 "libavutil/x86/asm.h"
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#include "h263.h"
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#include "mpeg4video.h"
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#include "msmpeg4data.h"
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#include "vc1data.h"
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/*
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* You can also call this codec : MPEG4 with a twist !
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*
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* TODO:
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* - (encoding) select best mv table (two choices)
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* - (encoding) select best vlc/dc table
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*/
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/* This table is practically identical to the one from h263
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* except that it is inverted. */
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static av_cold void init_h263_dc_for_msmpeg4(void)
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{
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int level, uni_code, uni_len;
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for(level=-256; level<256; level++){
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int size, v, l;
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/* find number of bits */
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size = 0;
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v = abs(level);
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while (v) {
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v >>= 1;
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size++;
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}
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if (level < 0)
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l= (-level) ^ ((1 << size) - 1);
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else
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l= level;
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/* luminance h263 */
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uni_code= ff_mpeg4_DCtab_lum[size][0];
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uni_len = ff_mpeg4_DCtab_lum[size][1];
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uni_code ^= (1<<uni_len)-1; //M$ does not like compatibility
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if (size > 0) {
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uni_code<<=size; uni_code|=l;
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uni_len+=size;
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if (size > 8){
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uni_code<<=1; uni_code|=1;
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uni_len++;
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}
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}
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ff_v2_dc_lum_table[level + 256][0] = uni_code;
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ff_v2_dc_lum_table[level + 256][1] = uni_len;
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/* chrominance h263 */
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uni_code= ff_mpeg4_DCtab_chrom[size][0];
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uni_len = ff_mpeg4_DCtab_chrom[size][1];
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uni_code ^= (1<<uni_len)-1; //M$ does not like compatibility
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if (size > 0) {
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uni_code<<=size; uni_code|=l;
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uni_len+=size;
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if (size > 8){
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uni_code<<=1; uni_code|=1;
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uni_len++;
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}
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}
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ff_v2_dc_chroma_table[level + 256][0] = uni_code;
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ff_v2_dc_chroma_table[level + 256][1] = uni_len;
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}
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}
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av_cold void ff_msmpeg4_common_init(MpegEncContext *s)
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{
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static int initialized=0;
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switch(s->msmpeg4_version){
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case 1:
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case 2:
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s->y_dc_scale_table=
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s->c_dc_scale_table= ff_mpeg1_dc_scale_table;
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break;
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case 3:
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if(s->workaround_bugs){
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s->y_dc_scale_table= ff_old_ff_y_dc_scale_table;
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s->c_dc_scale_table= ff_wmv1_c_dc_scale_table;
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} else{
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s->y_dc_scale_table= ff_mpeg4_y_dc_scale_table;
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s->c_dc_scale_table= ff_mpeg4_c_dc_scale_table;
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}
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break;
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case 4:
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case 5:
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s->y_dc_scale_table= ff_wmv1_y_dc_scale_table;
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s->c_dc_scale_table= ff_wmv1_c_dc_scale_table;
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break;
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#if CONFIG_VC1_DECODER
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case 6:
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s->y_dc_scale_table= ff_wmv3_dc_scale_table;
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s->c_dc_scale_table= ff_wmv3_dc_scale_table;
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break;
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#endif
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}
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if(s->msmpeg4_version>=4){
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ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable , ff_wmv1_scantable[1]);
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ff_init_scantable(s->dsp.idct_permutation, &s->intra_h_scantable, ff_wmv1_scantable[2]);
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ff_init_scantable(s->dsp.idct_permutation, &s->intra_v_scantable, ff_wmv1_scantable[3]);
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ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable , ff_wmv1_scantable[0]);
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}
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//Note the default tables are set in common_init in mpegvideo.c
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if(!initialized){
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initialized=1;
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init_h263_dc_for_msmpeg4();
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}
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}
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/* predict coded block */
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int ff_msmpeg4_coded_block_pred(MpegEncContext * s, int n, uint8_t **coded_block_ptr)
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{
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int xy, wrap, pred, a, b, c;
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xy = s->block_index[n];
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wrap = s->b8_stride;
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/* B C
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* A X
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*/
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a = s->coded_block[xy - 1 ];
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b = s->coded_block[xy - 1 - wrap];
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c = s->coded_block[xy - wrap];
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if (b == c) {
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pred = a;
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} else {
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pred = c;
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}
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/* store value */
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*coded_block_ptr = &s->coded_block[xy];
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return pred;
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}
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static int get_dc(uint8_t *src, int stride, int scale)
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{
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int y;
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int sum=0;
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for(y=0; y<8; y++){
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int x;
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for(x=0; x<8; x++){
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sum+=src[x + y*stride];
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}
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}
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return FASTDIV((sum + (scale>>1)), scale);
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}
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/* dir = 0: left, dir = 1: top prediction */
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int ff_msmpeg4_pred_dc(MpegEncContext *s, int n,
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int16_t **dc_val_ptr, int *dir_ptr)
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{
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int a, b, c, wrap, pred, scale;
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int16_t *dc_val;
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/* find prediction */
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if (n < 4) {
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scale = s->y_dc_scale;
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} else {
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scale = s->c_dc_scale;
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}
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wrap = s->block_wrap[n];
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dc_val= s->dc_val[0] + s->block_index[n];
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/* B C
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* A X
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*/
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a = dc_val[ - 1];
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b = dc_val[ - 1 - wrap];
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c = dc_val[ - wrap];
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if(s->first_slice_line && (n&2)==0 && s->msmpeg4_version<4){
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b=c=1024;
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}
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/* XXX: the following solution consumes divisions, but it does not
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necessitate to modify mpegvideo.c. The problem comes from the
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fact they decided to store the quantized DC (which would lead
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to problems if Q could vary !) */
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#if ARCH_X86 && HAVE_7REGS && HAVE_EBX_AVAILABLE
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__asm__ volatile(
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"movl %3, %%eax \n\t"
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"shrl $1, %%eax \n\t"
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"addl %%eax, %2 \n\t"
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"addl %%eax, %1 \n\t"
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"addl %0, %%eax \n\t"
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"mull %4 \n\t"
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"movl %%edx, %0 \n\t"
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"movl %1, %%eax \n\t"
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"mull %4 \n\t"
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"movl %%edx, %1 \n\t"
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"movl %2, %%eax \n\t"
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"mull %4 \n\t"
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"movl %%edx, %2 \n\t"
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: "+b" (a), "+c" (b), "+D" (c)
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: "g" (scale), "S" (ff_inverse[scale])
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: "%eax", "%edx"
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);
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#else
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/* Divisions are costly everywhere; optimize the most common case. */
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if (scale == 8) {
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a = (a + (8 >> 1)) / 8;
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b = (b + (8 >> 1)) / 8;
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c = (c + (8 >> 1)) / 8;
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} else {
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a = FASTDIV((a + (scale >> 1)), scale);
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b = FASTDIV((b + (scale >> 1)), scale);
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c = FASTDIV((c + (scale >> 1)), scale);
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}
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#endif
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/* XXX: WARNING: they did not choose the same test as MPEG4. This
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is very important ! */
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if(s->msmpeg4_version>3){
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if(s->inter_intra_pred){
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uint8_t *dest;
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int wrap;
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if(n==1){
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pred=a;
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*dir_ptr = 0;
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}else if(n==2){
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pred=c;
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*dir_ptr = 1;
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}else if(n==3){
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if (abs(a - b) < abs(b - c)) {
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pred = c;
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*dir_ptr = 1;
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} else {
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pred = a;
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*dir_ptr = 0;
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}
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}else{
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if(n<4){
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wrap= s->linesize;
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dest= s->current_picture.f.data[0] + (((n >> 1) + 2*s->mb_y) * 8* wrap ) + ((n & 1) + 2*s->mb_x) * 8;
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}else{
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wrap= s->uvlinesize;
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dest= s->current_picture.f.data[n - 3] + (s->mb_y * 8 * wrap) + s->mb_x * 8;
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}
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if(s->mb_x==0) a= (1024 + (scale>>1))/scale;
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else a= get_dc(dest-8, wrap, scale*8);
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if(s->mb_y==0) c= (1024 + (scale>>1))/scale;
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else c= get_dc(dest-8*wrap, wrap, scale*8);
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if (s->h263_aic_dir==0) {
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pred= a;
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*dir_ptr = 0;
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}else if (s->h263_aic_dir==1) {
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if(n==0){
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pred= c;
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*dir_ptr = 1;
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}else{
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pred= a;
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*dir_ptr = 0;
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}
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}else if (s->h263_aic_dir==2) {
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if(n==0){
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pred= a;
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*dir_ptr = 0;
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}else{
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pred= c;
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*dir_ptr = 1;
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}
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} else {
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pred= c;
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*dir_ptr = 1;
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}
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}
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}else{
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if (abs(a - b) < abs(b - c)) {
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pred = c;
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*dir_ptr = 1;
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} else {
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pred = a;
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*dir_ptr = 0;
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}
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}
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}else{
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if (abs(a - b) <= abs(b - c)) {
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pred = c;
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*dir_ptr = 1;
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} else {
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pred = a;
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*dir_ptr = 0;
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}
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}
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/* update predictor */
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*dc_val_ptr = &dc_val[0];
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return pred;
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}
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