msmpeg4.c

Go to the documentation of this file.

/*
 * MSMPEG4 backend for encoder and decoder
 * Copyright (c) 2001 Fabrice Bellard
 * Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>
 *
 * msmpeg4v1 & v2 stuff by Michael Niedermayer <michaelni@gmx.at>
 *
 * 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
 */
 
/**
 * @file
 * MSMPEG4 backend for encoder and decoder
 */
 
#include "config.h"
#include "config_components.h"
 
#include "libavutil/attributes.h"
#include "libavutil/avassert.h"
#include "libavutil/thread.h"
#if ARCH_X86
#include "libavutil/x86/asm.h"
#endif
 
#include "avcodec.h"
#include "idctdsp.h"
#include "mathops.h"
#include "mpegvideo.h"
#include "msmpeg4.h"
#include "mpeg4videodata.h"
#include "msmpeg4data.h"
#include "msmpeg4_vc1_data.h"
#include "wmv2dsp.h"
 
/*
 * You can also call this codec: MPEG-4 with a twist!
 *
 * TODO:
 *        - (encoding) select best mv table (two choices)
 *        - (encoding) select best vlc/dc table
 */
 
/* This table is practically identical to the one from H.263
 * except that it is inverted. */
static av_cold void init_h263_dc_for_msmpeg4(void)
{
    for (int level = -256; level < 256; level++) {
        int uni_code, uni_len;
        int size, v, l;
        /* find number of bits */
        size = 0;
        v = abs(level);
        while (v) {
            v >>= 1;
            size++;
        }
 
        if (level < 0)
            l = (-level) ^ ((1 << size) - 1);
        else
            l = level;
 
        /* luminance H.263 */
        uni_code  = ff_mpeg4_DCtab_lum[size][0];
        uni_len   = ff_mpeg4_DCtab_lum[size][1];
        uni_code ^= (1 << uni_len) - 1; //M$ does not like compatibility
 
        if (size > 0) {
            uni_code <<= size; uni_code |= l;
            uni_len   += size;
            if (size > 8) {
                uni_code <<= 1; uni_code |= 1;
                uni_len++;
            }
        }
        ff_v2_dc_lum_table[level + 256][0] = uni_code;
        ff_v2_dc_lum_table[level + 256][1] = uni_len;
 
        /* chrominance H.263 */
        uni_code  = ff_mpeg4_DCtab_chrom[size][0];
        uni_len   = ff_mpeg4_DCtab_chrom[size][1];
        uni_code ^= (1 << uni_len) - 1; //M$ does not like compatibility
 
        if (size > 0) {
            uni_code <<= size; uni_code |= l;
            uni_len   +=size;
            if (size > 8) {
                uni_code <<= 1; uni_code |= 1;
                uni_len++;
            }
        }
        ff_v2_dc_chroma_table[level + 256][0] = uni_code;
        ff_v2_dc_chroma_table[level + 256][1] = uni_len;
    }
}
 
static av_cold void msmpeg4_common_init_static(void)
{
    static uint8_t rl_table_store[NB_RL_TABLES][2][2 * MAX_RUN + MAX_LEVEL + 3];
 
    for (int i = 0; i < NB_RL_TABLES; i++)
        ff_rl_init(&ff_rl_table[i], rl_table_store[i]);
 
    init_h263_dc_for_msmpeg4();
}
 
av_cold void ff_msmpeg4_common_init(MPVContext *const s,
                                    uint8_t permutated_intra_h_scantable[64],
                                    uint8_t permutated_intra_v_scantable[64])
{
    static AVOnce init_static_once = AV_ONCE_INIT;
 
    switch(s->msmpeg4_version){
    default:
        av_unreachable("ff_msmpeg4_common_init only called by MSMP4 1-3 and WMV1/2");
    case MSMP4_V1:
    case MSMP4_V2:
        // Correct *_dc_scale_tables (ff_mpeg1_dc_scale_table) is the default
        break;
    case MSMP4_V3:
        if(s->workaround_bugs){
            s->y_dc_scale_table= ff_old_ff_y_dc_scale_table;
            s->c_dc_scale_table= ff_wmv1_c_dc_scale_table;
        } else{
            s->y_dc_scale_table= ff_mpeg4_y_dc_scale_table;
            s->c_dc_scale_table= ff_mpeg4_c_dc_scale_table;
        }
        break;
#if CONFIG_WMV2_DECODER || CONFIG_WMV2_ENCODER
    case MSMP4_WMV2:
        ff_wmv2dsp_init(&s->idsp);
        av_fallthrough;
#endif
    case MSMP4_WMV1:
        s->y_dc_scale_table= ff_wmv1_y_dc_scale_table;
        s->c_dc_scale_table= ff_wmv1_c_dc_scale_table;
        ff_init_scantable(s->idsp.idct_permutation, &s->intra_scantable,   ff_wmv1_scantable[1]);
        ff_init_scantable(s->idsp.idct_permutation, &s->inter_scantable,   ff_wmv1_scantable[0]);
        ff_permute_scantable(permutated_intra_h_scantable, ff_wmv1_scantable[2],
                             s->idsp.idct_permutation);
        ff_permute_scantable(permutated_intra_v_scantable, ff_wmv1_scantable[3],
                             s->idsp.idct_permutation);
        break;
    }
 
    ff_thread_once(&init_static_once, msmpeg4_common_init_static);
}
 
/* predict coded block */
int ff_msmpeg4_coded_block_pred(MpegEncContext * s, int n, uint8_t **coded_block_ptr)
{
    int xy, wrap, pred, a, b, c;
 
    xy = s->block_index[n];
    wrap = s->b8_stride;
 
    /* B C
     * A X
     */
    a = s->coded_block[xy - 1       ];
    b = s->coded_block[xy - 1 - wrap];
    c = s->coded_block[xy     - wrap];
 
    if (b == c) {
        pred = a;
    } else {
        pred = c;
    }
 
    /* store value */
    *coded_block_ptr = &s->coded_block[xy];
 
    return pred;
}
 
static int get_dc(uint8_t *src, int stride, int scale, int block_size)
{
    int y;
    int sum=0;
    for(y=0; y<block_size; y++){
        int x;
        for(x=0; x<block_size; x++){
            sum+=src[x + y*stride];
        }
    }
    return FASTDIV((sum + (scale>>1)), scale);
}
 
/* dir = 0: left, dir = 1: top prediction */
int ff_msmpeg4_pred_dc(MpegEncContext *s, int n,
                       int16_t **dc_val_ptr, int *dir_ptr)
{
    int a, b, c, wrap, pred, scale;
    int16_t *const dc_val = s->dc_val + s->block_index[n];
 
    /* find prediction */
    if (n < 4) {
        scale = s->y_dc_scale;
    } else {
        scale = s->c_dc_scale;
    }
 
    wrap = s->block_wrap[n];
 
    /* B C
     * A X
     */
    a = dc_val[ - 1];
    b = dc_val[ - 1 - wrap];
    c = dc_val[ - wrap];
 
    if (s->first_slice_line && !(n & 2) && s->msmpeg4_version < MSMP4_WMV1)
        b=c=1024;
 
    /* XXX: the following solution consumes divisions, but it does not
       necessitate to modify mpegvideo.c. The problem comes from the
       fact they decided to store the quantized DC (which would lead
       to problems if Q could vary !) */
#if ARCH_X86 && HAVE_7REGS && HAVE_EBX_AVAILABLE
    __asm__ volatile(
        "movl %3, %%eax         \n\t"
        "shrl $1, %%eax         \n\t"
        "addl %%eax, %2         \n\t"
        "addl %%eax, %1         \n\t"
        "addl %0, %%eax         \n\t"
        "imull %4               \n\t"
        "movl %%edx, %0         \n\t"
        "movl %1, %%eax         \n\t"
        "imull %4               \n\t"
        "movl %%edx, %1         \n\t"
        "movl %2, %%eax         \n\t"
        "imull %4               \n\t"
        "movl %%edx, %2         \n\t"
        : "+b" (a), "+c" (b), "+D" (c)
        : "g" (scale), "S" (ff_inverse[scale])
        : "%eax", "%edx"
    );
#else
    /* Divisions are costly everywhere; optimize the most common case. */
    if (scale == 8) {
        a = (a + (8 >> 1)) / 8;
        b = (b + (8 >> 1)) / 8;
        c = (c + (8 >> 1)) / 8;
    } else {
        a = FASTDIV((a + (scale >> 1)), scale);
        b = FASTDIV((b + (scale >> 1)), scale);
        c = FASTDIV((c + (scale >> 1)), scale);
    }
#endif
    /* XXX: WARNING: they did not choose the same test as MPEG-4. This
       is very important ! */
    if (s->msmpeg4_version > MSMP4_V3) {
        if(s->inter_intra_pred){
            uint8_t *dest;
            int wrap;
 
            if(n==1){
                pred=a;
                *dir_ptr = 0;
            }else if(n==2){
                pred=c;
                *dir_ptr = 1;
            }else if(n==3){
                if (abs(a - b) < abs(b - c)) {
                    pred = c;
                    *dir_ptr = 1;
                } else {
                    pred = a;
                    *dir_ptr = 0;
                }
            }else{
                int bs = 8 >> s->avctx->lowres;
                if(n<4){
                    wrap= s->linesize;
                    dest = s->cur_pic.data[0] + (((n >> 1) + 2*s->mb_y) * bs*  wrap ) + ((n & 1) + 2*s->mb_x) * bs;
                }else{
                    wrap= s->uvlinesize;
                    dest = s->cur_pic.data[n - 3] + (s->mb_y * bs * wrap) + s->mb_x * bs;
                }
                if(s->mb_x==0) a= (1024 + (scale>>1))/scale;
                else           a= get_dc(dest-bs, wrap, scale*8>>(2*s->avctx->lowres), bs);
                if(s->mb_y==0) c= (1024 + (scale>>1))/scale;
                else           c= get_dc(dest-bs*wrap, wrap, scale*8>>(2*s->avctx->lowres), bs);
 
                if (s->h263_aic_dir==0) {
                    pred= a;
                    *dir_ptr = 0;
                }else if (s->h263_aic_dir==1) {
                    if(n==0){
                        pred= c;
                        *dir_ptr = 1;
                    }else{
                        pred= a;
                        *dir_ptr = 0;
                    }
                }else if (s->h263_aic_dir==2) {
                    if(n==0){
                        pred= a;
                        *dir_ptr = 0;
                    }else{
                        pred= c;
                        *dir_ptr = 1;
                    }
                } else {
                    pred= c;
                    *dir_ptr = 1;
                }
            }
        }else{
            if (abs(a - b) < abs(b - c)) {
                pred = c;
                *dir_ptr = 1;
            } else {
                pred = a;
                *dir_ptr = 0;
            }
        }
    }else{
        if (abs(a - b) <= abs(b - c)) {
            pred = c;
            *dir_ptr = 1;
        } else {
            pred = a;
            *dir_ptr = 0;
        }
    }
 
    /* update predictor */
    *dc_val_ptr = &dc_val[0];
    return pred;
}