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FFmpeg/libavcodec/rv40.c
Reinhard Tartler 737eb5976f Merge libavcore into libavutil 
It is pretty hopeless that other considerable projects will adopt
libavutil alone in other projects. Projects that need small footprint
are better off with more specialized libraries such as gnulib or rather
just copy the necessary parts that they need. With this in mind, nobody
is helped by having libavutil and libavcore split. In order to ease
maintenance inside and around FFmpeg and to reduce confusion where to
put common code, avcore's functionality is merged (back) to avutil.

Signed-off-by: Reinhard Tartler <siretart@tauware.de>
2011-02-15 16:18:21 +01:00

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/*
* RV40 decoder
* Copyright (c) 2007 Konstantin Shishkov
*
* 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
* RV40 decoder
*/
#include "libavutil/imgutils.h"
#include "avcodec.h"
#include "dsputil.h"
#include "mpegvideo.h"
#include "golomb.h"
#include "rv34.h"
#include "rv40vlc2.h"
#include "rv40data.h"
static VLC aic_top_vlc;
static VLC aic_mode1_vlc[AIC_MODE1_NUM], aic_mode2_vlc[AIC_MODE2_NUM];
static VLC ptype_vlc[NUM_PTYPE_VLCS], btype_vlc[NUM_BTYPE_VLCS];
static const int16_t mode2_offs[] = {
0, 614, 1222, 1794, 2410, 3014, 3586, 4202, 4792, 5382, 5966, 6542,
7138, 7716, 8292, 8864, 9444, 10030, 10642, 11212, 11814
};
/**
* Initialize all tables.
*/
static av_cold void rv40_init_tables(void)
{
int i;
static VLC_TYPE aic_table[1 << AIC_TOP_BITS][2];
static VLC_TYPE aic_mode1_table[AIC_MODE1_NUM << AIC_MODE1_BITS][2];
static VLC_TYPE aic_mode2_table[11814][2];
static VLC_TYPE ptype_table[NUM_PTYPE_VLCS << PTYPE_VLC_BITS][2];
static VLC_TYPE btype_table[NUM_BTYPE_VLCS << BTYPE_VLC_BITS][2];
aic_top_vlc.table = aic_table;
aic_top_vlc.table_allocated = 1 << AIC_TOP_BITS;
init_vlc(&aic_top_vlc, AIC_TOP_BITS, AIC_TOP_SIZE,
rv40_aic_top_vlc_bits, 1, 1,
rv40_aic_top_vlc_codes, 1, 1, INIT_VLC_USE_NEW_STATIC);
for(i = 0; i < AIC_MODE1_NUM; i++){
// Every tenth VLC table is empty
if((i % 10) == 9) continue;
aic_mode1_vlc[i].table = &aic_mode1_table[i << AIC_MODE1_BITS];
aic_mode1_vlc[i].table_allocated = 1 << AIC_MODE1_BITS;
init_vlc(&aic_mode1_vlc[i], AIC_MODE1_BITS, AIC_MODE1_SIZE,
aic_mode1_vlc_bits[i], 1, 1,
aic_mode1_vlc_codes[i], 1, 1, INIT_VLC_USE_NEW_STATIC);
}
for(i = 0; i < AIC_MODE2_NUM; i++){
aic_mode2_vlc[i].table = &aic_mode2_table[mode2_offs[i]];
aic_mode2_vlc[i].table_allocated = mode2_offs[i + 1] - mode2_offs[i];
init_vlc(&aic_mode2_vlc[i], AIC_MODE2_BITS, AIC_MODE2_SIZE,
aic_mode2_vlc_bits[i], 1, 1,
aic_mode2_vlc_codes[i], 2, 2, INIT_VLC_USE_NEW_STATIC);
}
for(i = 0; i < NUM_PTYPE_VLCS; i++){
ptype_vlc[i].table = &ptype_table[i << PTYPE_VLC_BITS];
ptype_vlc[i].table_allocated = 1 << PTYPE_VLC_BITS;
init_vlc_sparse(&ptype_vlc[i], PTYPE_VLC_BITS, PTYPE_VLC_SIZE,
ptype_vlc_bits[i], 1, 1,
ptype_vlc_codes[i], 1, 1,
ptype_vlc_syms, 1, 1, INIT_VLC_USE_NEW_STATIC);
}
for(i = 0; i < NUM_BTYPE_VLCS; i++){
btype_vlc[i].table = &btype_table[i << BTYPE_VLC_BITS];
btype_vlc[i].table_allocated = 1 << BTYPE_VLC_BITS;
init_vlc_sparse(&btype_vlc[i], BTYPE_VLC_BITS, BTYPE_VLC_SIZE,
btype_vlc_bits[i], 1, 1,
btype_vlc_codes[i], 1, 1,
btype_vlc_syms, 1, 1, INIT_VLC_USE_NEW_STATIC);
}
}
/**
* Get stored dimension from bitstream.
*
* If the width/height is the standard one then it's coded as a 3-bit index.
* Otherwise it is coded as escaped 8-bit portions.
*/
static int get_dimension(GetBitContext *gb, const int *dim)
{
int t = get_bits(gb, 3);
int val = dim[t];
if(val < 0)
val = dim[get_bits1(gb) - val];
if(!val){
do{
t = get_bits(gb, 8);
val += t << 2;
}while(t == 0xFF);
}
return val;
}
/**
* Get encoded picture size - usually this is called from rv40_parse_slice_header.
*/
static void rv40_parse_picture_size(GetBitContext *gb, int *w, int *h)
{
*w = get_dimension(gb, rv40_standard_widths);
*h = get_dimension(gb, rv40_standard_heights);
}
static int rv40_parse_slice_header(RV34DecContext *r, GetBitContext *gb, SliceInfo *si)
{
int mb_bits;
int w = r->s.width, h = r->s.height;
int mb_size;
memset(si, 0, sizeof(SliceInfo));
if(get_bits1(gb))
return -1;
si->type = get_bits(gb, 2);
if(si->type == 1) si->type = 0;
si->quant = get_bits(gb, 5);
if(get_bits(gb, 2))
return -1;
si->vlc_set = get_bits(gb, 2);
skip_bits1(gb);
si->pts = get_bits(gb, 13);
if(!si->type || !get_bits1(gb))
rv40_parse_picture_size(gb, &w, &h);
if(av_image_check_size(w, h, 0, r->s.avctx) < 0)
return -1;
si->width = w;
si->height = h;
mb_size = ((w + 15) >> 4) * ((h + 15) >> 4);
mb_bits = ff_rv34_get_start_offset(gb, mb_size);
si->start = get_bits(gb, mb_bits);
return 0;
}
/**
* Decode 4x4 intra types array.
*/
static int rv40_decode_intra_types(RV34DecContext *r, GetBitContext *gb, int8_t *dst)
{
MpegEncContext *s = &r->s;
int i, j, k, v;
int A, B, C;
int pattern;
int8_t *ptr;
for(i = 0; i < 4; i++, dst += r->intra_types_stride){
if(!i && s->first_slice_line){
pattern = get_vlc2(gb, aic_top_vlc.table, AIC_TOP_BITS, 1);
dst[0] = (pattern >> 2) & 2;
dst[1] = (pattern >> 1) & 2;
dst[2] = pattern & 2;
dst[3] = (pattern << 1) & 2;
continue;
}
ptr = dst;
for(j = 0; j < 4; j++){
/* Coefficients are read using VLC chosen by the prediction pattern
* The first one (used for retrieving a pair of coefficients) is
* constructed from the top, top right and left coefficients
* The second one (used for retrieving only one coefficient) is
* top + 10 * left.
*/
A = ptr[-r->intra_types_stride + 1]; // it won't be used for the last coefficient in a row
B = ptr[-r->intra_types_stride];
C = ptr[-1];
pattern = A + (B << 4) + (C << 8);
for(k = 0; k < MODE2_PATTERNS_NUM; k++)
if(pattern == rv40_aic_table_index[k])
break;
if(j < 3 && k < MODE2_PATTERNS_NUM){ //pattern is found, decoding 2 coefficients
v = get_vlc2(gb, aic_mode2_vlc[k].table, AIC_MODE2_BITS, 2);
*ptr++ = v/9;
*ptr++ = v%9;
j++;
}else{
if(B != -1 && C != -1)
v = get_vlc2(gb, aic_mode1_vlc[B + C*10].table, AIC_MODE1_BITS, 1);
else{ // tricky decoding
v = 0;
switch(C){
case -1: // code 0 -> 1, 1 -> 0
if(B < 2)
v = get_bits1(gb) ^ 1;
break;
case 0:
case 2: // code 0 -> 2, 1 -> 0
v = (get_bits1(gb) ^ 1) << 1;
break;
}
}
*ptr++ = v;
}
}
}
return 0;
}
/**
* Decode macroblock information.
*/
static int rv40_decode_mb_info(RV34DecContext *r)
{
MpegEncContext *s = &r->s;
GetBitContext *gb = &s->gb;
int q, i;
int prev_type = 0;
int mb_pos = s->mb_x + s->mb_y * s->mb_stride;
int blocks[RV34_MB_TYPES] = {0};
int count = 0;
if(!r->s.mb_skip_run)
r->s.mb_skip_run = svq3_get_ue_golomb(gb) + 1;
if(--r->s.mb_skip_run)
return RV34_MB_SKIP;
if(r->avail_cache[6-1])
blocks[r->mb_type[mb_pos - 1]]++;
if(r->avail_cache[6-4]){
blocks[r->mb_type[mb_pos - s->mb_stride]]++;
if(r->avail_cache[6-2])
blocks[r->mb_type[mb_pos - s->mb_stride + 1]]++;
if(r->avail_cache[6-5])
blocks[r->mb_type[mb_pos - s->mb_stride - 1]]++;
}
for(i = 0; i < RV34_MB_TYPES; i++){
if(blocks[i] > count){
count = blocks[i];
prev_type = i;
}
}
if(s->pict_type == FF_P_TYPE){
prev_type = block_num_to_ptype_vlc_num[prev_type];
q = get_vlc2(gb, ptype_vlc[prev_type].table, PTYPE_VLC_BITS, 1);
if(q < PBTYPE_ESCAPE)
return q;
q = get_vlc2(gb, ptype_vlc[prev_type].table, PTYPE_VLC_BITS, 1);
av_log(s->avctx, AV_LOG_ERROR, "Dquant for P-frame\n");
}else{
prev_type = block_num_to_btype_vlc_num[prev_type];
q = get_vlc2(gb, btype_vlc[prev_type].table, BTYPE_VLC_BITS, 1);
if(q < PBTYPE_ESCAPE)
return q;
q = get_vlc2(gb, btype_vlc[prev_type].table, BTYPE_VLC_BITS, 1);
av_log(s->avctx, AV_LOG_ERROR, "Dquant for B-frame\n");
}
return 0;
}
#define CLIP_SYMM(a, b) av_clip(a, -(b), b)
/**
* weaker deblocking very similar to the one described in 4.4.2 of JVT-A003r1
*/
static inline void rv40_weak_loop_filter(uint8_t *src, const int step,
const int filter_p1, const int filter_q1,
const int alpha, const int beta,
const int lim_p0q0,
const int lim_q1, const int lim_p1,
const int diff_p1p0, const int diff_q1q0,
const int diff_p1p2, const int diff_q1q2)
{
uint8_t *cm = ff_cropTbl + MAX_NEG_CROP;
int t, u, diff;
t = src[0*step] - src[-1*step];
if(!t)
return;
u = (alpha * FFABS(t)) >> 7;
if(u > 3 - (filter_p1 && filter_q1))
return;
t <<= 2;
if(filter_p1 && filter_q1)
t += src[-2*step] - src[1*step];
diff = CLIP_SYMM((t + 4) >> 3, lim_p0q0);
src[-1*step] = cm[src[-1*step] + diff];
src[ 0*step] = cm[src[ 0*step] - diff];
if(FFABS(diff_p1p2) <= beta && filter_p1){
t = (diff_p1p0 + diff_p1p2 - diff) >> 1;
src[-2*step] = cm[src[-2*step] - CLIP_SYMM(t, lim_p1)];
}
if(FFABS(diff_q1q2) <= beta && filter_q1){
t = (diff_q1q0 + diff_q1q2 + diff) >> 1;
src[ 1*step] = cm[src[ 1*step] - CLIP_SYMM(t, lim_q1)];
}
}
static av_always_inline void rv40_adaptive_loop_filter(uint8_t *src, const int step,
const int stride, const int dmode,
const int lim_q1, const int lim_p1,
const int alpha,
const int beta, const int beta2,
const int chroma, const int edge)
{
int diff_p1p0[4], diff_q1q0[4], diff_p1p2[4], diff_q1q2[4];
int sum_p1p0 = 0, sum_q1q0 = 0, sum_p1p2 = 0, sum_q1q2 = 0;
uint8_t *ptr;
int flag_strong0 = 1, flag_strong1 = 1;
int filter_p1, filter_q1;
int i;
int lims;
for(i = 0, ptr = src; i < 4; i++, ptr += stride){
diff_p1p0[i] = ptr[-2*step] - ptr[-1*step];
diff_q1q0[i] = ptr[ 1*step] - ptr[ 0*step];
sum_p1p0 += diff_p1p0[i];
sum_q1q0 += diff_q1q0[i];
}
filter_p1 = FFABS(sum_p1p0) < (beta<<2);
filter_q1 = FFABS(sum_q1q0) < (beta<<2);
if(!filter_p1 && !filter_q1)
return;
for(i = 0, ptr = src; i < 4; i++, ptr += stride){
diff_p1p2[i] = ptr[-2*step] - ptr[-3*step];
diff_q1q2[i] = ptr[ 1*step] - ptr[ 2*step];
sum_p1p2 += diff_p1p2[i];
sum_q1q2 += diff_q1q2[i];
}
if(edge){
flag_strong0 = filter_p1 && (FFABS(sum_p1p2) < beta2);
flag_strong1 = filter_q1 && (FFABS(sum_q1q2) < beta2);
}else{
flag_strong0 = flag_strong1 = 0;
}
lims = filter_p1 + filter_q1 + ((lim_q1 + lim_p1) >> 1) + 1;
if(flag_strong0 && flag_strong1){ /* strong filtering */
for(i = 0; i < 4; i++, src += stride){
int sflag, p0, q0, p1, q1;
int t = src[0*step] - src[-1*step];
if(!t) continue;
sflag = (alpha * FFABS(t)) >> 7;
if(sflag > 1) continue;
p0 = (25*src[-3*step] + 26*src[-2*step]
+ 26*src[-1*step]
+ 26*src[ 0*step] + 25*src[ 1*step] + rv40_dither_l[dmode + i]) >> 7;
q0 = (25*src[-2*step] + 26*src[-1*step]
+ 26*src[ 0*step]
+ 26*src[ 1*step] + 25*src[ 2*step] + rv40_dither_r[dmode + i]) >> 7;
if(sflag){
p0 = av_clip(p0, src[-1*step] - lims, src[-1*step] + lims);
q0 = av_clip(q0, src[ 0*step] - lims, src[ 0*step] + lims);
}
p1 = (25*src[-4*step] + 26*src[-3*step]
+ 26*src[-2*step]
+ 26*p0 + 25*src[ 0*step] + rv40_dither_l[dmode + i]) >> 7;
q1 = (25*src[-1*step] + 26*q0
+ 26*src[ 1*step]
+ 26*src[ 2*step] + 25*src[ 3*step] + rv40_dither_r[dmode + i]) >> 7;
if(sflag){
p1 = av_clip(p1, src[-2*step] - lims, src[-2*step] + lims);
q1 = av_clip(q1, src[ 1*step] - lims, src[ 1*step] + lims);
}
src[-2*step] = p1;
src[-1*step] = p0;
src[ 0*step] = q0;
src[ 1*step] = q1;
if(!chroma){
src[-3*step] = (25*src[-1*step] + 26*src[-2*step] + 51*src[-3*step] + 26*src[-4*step] + 64) >> 7;
src[ 2*step] = (25*src[ 0*step] + 26*src[ 1*step] + 51*src[ 2*step] + 26*src[ 3*step] + 64) >> 7;
}
}
}else if(filter_p1 && filter_q1){
for(i = 0; i < 4; i++, src += stride)
rv40_weak_loop_filter(src, step, 1, 1, alpha, beta, lims, lim_q1, lim_p1,
diff_p1p0[i], diff_q1q0[i], diff_p1p2[i], diff_q1q2[i]);
}else{
for(i = 0; i < 4; i++, src += stride)
rv40_weak_loop_filter(src, step, filter_p1, filter_q1,
alpha, beta, lims>>1, lim_q1>>1, lim_p1>>1,
diff_p1p0[i], diff_q1q0[i], diff_p1p2[i], diff_q1q2[i]);
}
}
static void rv40_v_loop_filter(uint8_t *src, int stride, int dmode,
int lim_q1, int lim_p1,
int alpha, int beta, int beta2, int chroma, int edge){
rv40_adaptive_loop_filter(src, 1, stride, dmode, lim_q1, lim_p1,
alpha, beta, beta2, chroma, edge);
}
static void rv40_h_loop_filter(uint8_t *src, int stride, int dmode,
int lim_q1, int lim_p1,
int alpha, int beta, int beta2, int chroma, int edge){
rv40_adaptive_loop_filter(src, stride, 1, dmode, lim_q1, lim_p1,
alpha, beta, beta2, chroma, edge);
}
enum RV40BlockPos{
POS_CUR,
POS_TOP,
POS_LEFT,
POS_BOTTOM,
};
#define MASK_CUR 0x0001
#define MASK_RIGHT 0x0008
#define MASK_BOTTOM 0x0010
#define MASK_TOP 0x1000
#define MASK_Y_TOP_ROW 0x000F
#define MASK_Y_LAST_ROW 0xF000
#define MASK_Y_LEFT_COL 0x1111
#define MASK_Y_RIGHT_COL 0x8888
#define MASK_C_TOP_ROW 0x0003
#define MASK_C_LAST_ROW 0x000C
#define MASK_C_LEFT_COL 0x0005
#define MASK_C_RIGHT_COL 0x000A
static const int neighbour_offs_x[4] = { 0, 0, -1, 0 };
static const int neighbour_offs_y[4] = { 0, -1, 0, 1 };
/**
* RV40 loop filtering function
*/
static void rv40_loop_filter(RV34DecContext *r, int row)
{
MpegEncContext *s = &r->s;
int mb_pos, mb_x;
int i, j, k;
uint8_t *Y, *C;
int alpha, beta, betaY, betaC;
int q;
int mbtype[4]; ///< current macroblock and its neighbours types
/**
* flags indicating that macroblock can be filtered with strong filter
* it is set only for intra coded MB and MB with DCs coded separately
*/
int mb_strong[4];
int clip[4]; ///< MB filter clipping value calculated from filtering strength
/**
* coded block patterns for luma part of current macroblock and its neighbours
* Format:
* LSB corresponds to the top left block,
* each nibble represents one row of subblocks.
*/
int cbp[4];
/**
* coded block patterns for chroma part of current macroblock and its neighbours
* Format is the same as for luma with two subblocks in a row.
*/
int uvcbp[4][2];
/**
* This mask represents the pattern of luma subblocks that should be filtered
* in addition to the coded ones because because they lie at the edge of
* 8x8 block with different enough motion vectors
*/
int mvmasks[4];
mb_pos = row * s->mb_stride;
for(mb_x = 0; mb_x < s->mb_width; mb_x++, mb_pos++){
int mbtype = s->current_picture_ptr->mb_type[mb_pos];
if(IS_INTRA(mbtype) || IS_SEPARATE_DC(mbtype))
r->cbp_luma [mb_pos] = r->deblock_coefs[mb_pos] = 0xFFFF;
if(IS_INTRA(mbtype))
r->cbp_chroma[mb_pos] = 0xFF;
}
mb_pos = row * s->mb_stride;
for(mb_x = 0; mb_x < s->mb_width; mb_x++, mb_pos++){
int y_h_deblock, y_v_deblock;
int c_v_deblock[2], c_h_deblock[2];
int clip_left;
int avail[4];
int y_to_deblock, c_to_deblock[2];
q = s->current_picture_ptr->qscale_table[mb_pos];
alpha = rv40_alpha_tab[q];
beta = rv40_beta_tab [q];
betaY = betaC = beta * 3;
if(s->width * s->height <= 176*144)
betaY += beta;
avail[0] = 1;
avail[1] = row;
avail[2] = mb_x;
avail[3] = row < s->mb_height - 1;
for(i = 0; i < 4; i++){
if(avail[i]){
int pos = mb_pos + neighbour_offs_x[i] + neighbour_offs_y[i]*s->mb_stride;
mvmasks[i] = r->deblock_coefs[pos];
mbtype [i] = s->current_picture_ptr->mb_type[pos];
cbp [i] = r->cbp_luma[pos];
uvcbp[i][0] = r->cbp_chroma[pos] & 0xF;
uvcbp[i][1] = r->cbp_chroma[pos] >> 4;
}else{
mvmasks[i] = 0;
mbtype [i] = mbtype[0];
cbp [i] = 0;
uvcbp[i][0] = uvcbp[i][1] = 0;
}
mb_strong[i] = IS_INTRA(mbtype[i]) || IS_SEPARATE_DC(mbtype[i]);
clip[i] = rv40_filter_clip_tbl[mb_strong[i] + 1][q];
}
y_to_deblock = mvmasks[POS_CUR]
| (mvmasks[POS_BOTTOM] << 16);
/* This pattern contains bits signalling that horizontal edges of
* the current block can be filtered.
* That happens when either of adjacent subblocks is coded or lies on
* the edge of 8x8 blocks with motion vectors differing by more than
* 3/4 pel in any component (any edge orientation for some reason).
*/
y_h_deblock = y_to_deblock
| ((cbp[POS_CUR] << 4) & ~MASK_Y_TOP_ROW)
| ((cbp[POS_TOP] & MASK_Y_LAST_ROW) >> 12);
/* This pattern contains bits signalling that vertical edges of
* the current block can be filtered.
* That happens when either of adjacent subblocks is coded or lies on
* the edge of 8x8 blocks with motion vectors differing by more than
* 3/4 pel in any component (any edge orientation for some reason).
*/
y_v_deblock = y_to_deblock
| ((cbp[POS_CUR] << 1) & ~MASK_Y_LEFT_COL)
| ((cbp[POS_LEFT] & MASK_Y_RIGHT_COL) >> 3);
if(!mb_x)
y_v_deblock &= ~MASK_Y_LEFT_COL;
if(!row)
y_h_deblock &= ~MASK_Y_TOP_ROW;
if(row == s->mb_height - 1 || (mb_strong[POS_CUR] || mb_strong[POS_BOTTOM]))
y_h_deblock &= ~(MASK_Y_TOP_ROW << 16);
/* Calculating chroma patterns is similar and easier since there is
* no motion vector pattern for them.
*/
for(i = 0; i < 2; i++){
c_to_deblock[i] = (uvcbp[POS_BOTTOM][i] << 4) | uvcbp[POS_CUR][i];
c_v_deblock[i] = c_to_deblock[i]
| ((uvcbp[POS_CUR] [i] << 1) & ~MASK_C_LEFT_COL)
| ((uvcbp[POS_LEFT][i] & MASK_C_RIGHT_COL) >> 1);
c_h_deblock[i] = c_to_deblock[i]
| ((uvcbp[POS_TOP][i] & MASK_C_LAST_ROW) >> 2)
| (uvcbp[POS_CUR][i] << 2);
if(!mb_x)
c_v_deblock[i] &= ~MASK_C_LEFT_COL;
if(!row)
c_h_deblock[i] &= ~MASK_C_TOP_ROW;
if(row == s->mb_height - 1 || mb_strong[POS_CUR] || mb_strong[POS_BOTTOM])
c_h_deblock[i] &= ~(MASK_C_TOP_ROW << 4);
}
for(j = 0; j < 16; j += 4){
Y = s->current_picture_ptr->data[0] + mb_x*16 + (row*16 + j) * s->linesize;
for(i = 0; i < 4; i++, Y += 4){
int ij = i + j;
int clip_cur = y_to_deblock & (MASK_CUR << ij) ? clip[POS_CUR] : 0;
int dither = j ? ij : i*4;
// if bottom block is coded then we can filter its top edge
// (or bottom edge of this block, which is the same)
if(y_h_deblock & (MASK_BOTTOM << ij)){
rv40_h_loop_filter(Y+4*s->linesize, s->linesize, dither,
y_to_deblock & (MASK_BOTTOM << ij) ? clip[POS_CUR] : 0,
clip_cur,
alpha, beta, betaY, 0, 0);
}
// filter left block edge in ordinary mode (with low filtering strength)
if(y_v_deblock & (MASK_CUR << ij) && (i || !(mb_strong[POS_CUR] || mb_strong[POS_LEFT]))){
if(!i)
clip_left = mvmasks[POS_LEFT] & (MASK_RIGHT << j) ? clip[POS_LEFT] : 0;
else
clip_left = y_to_deblock & (MASK_CUR << (ij-1)) ? clip[POS_CUR] : 0;
rv40_v_loop_filter(Y, s->linesize, dither,
clip_cur,
clip_left,
alpha, beta, betaY, 0, 0);
}
// filter top edge of the current macroblock when filtering strength is high
if(!j && y_h_deblock & (MASK_CUR << i) && (mb_strong[POS_CUR] || mb_strong[POS_TOP])){
rv40_h_loop_filter(Y, s->linesize, dither,
clip_cur,
mvmasks[POS_TOP] & (MASK_TOP << i) ? clip[POS_TOP] : 0,
alpha, beta, betaY, 0, 1);
}
// filter left block edge in edge mode (with high filtering strength)
if(y_v_deblock & (MASK_CUR << ij) && !i && (mb_strong[POS_CUR] || mb_strong[POS_LEFT])){
clip_left = mvmasks[POS_LEFT] & (MASK_RIGHT << j) ? clip[POS_LEFT] : 0;
rv40_v_loop_filter(Y, s->linesize, dither,
clip_cur,
clip_left,
alpha, beta, betaY, 0, 1);
}
}
}
for(k = 0; k < 2; k++){
for(j = 0; j < 2; j++){
C = s->current_picture_ptr->data[k+1] + mb_x*8 + (row*8 + j*4) * s->uvlinesize;
for(i = 0; i < 2; i++, C += 4){
int ij = i + j*2;
int clip_cur = c_to_deblock[k] & (MASK_CUR << ij) ? clip[POS_CUR] : 0;
if(c_h_deblock[k] & (MASK_CUR << (ij+2))){
int clip_bot = c_to_deblock[k] & (MASK_CUR << (ij+2)) ? clip[POS_CUR] : 0;
rv40_h_loop_filter(C+4*s->uvlinesize, s->uvlinesize, i*8,
clip_bot,
clip_cur,
alpha, beta, betaC, 1, 0);
}
if((c_v_deblock[k] & (MASK_CUR << ij)) && (i || !(mb_strong[POS_CUR] || mb_strong[POS_LEFT]))){
if(!i)
clip_left = uvcbp[POS_LEFT][k] & (MASK_CUR << (2*j+1)) ? clip[POS_LEFT] : 0;
else
clip_left = c_to_deblock[k] & (MASK_CUR << (ij-1)) ? clip[POS_CUR] : 0;
rv40_v_loop_filter(C, s->uvlinesize, j*8,
clip_cur,
clip_left,
alpha, beta, betaC, 1, 0);
}
if(!j && c_h_deblock[k] & (MASK_CUR << ij) && (mb_strong[POS_CUR] || mb_strong[POS_TOP])){
int clip_top = uvcbp[POS_TOP][k] & (MASK_CUR << (ij+2)) ? clip[POS_TOP] : 0;
rv40_h_loop_filter(C, s->uvlinesize, i*8,
clip_cur,
clip_top,
alpha, beta, betaC, 1, 1);
}
if(c_v_deblock[k] & (MASK_CUR << ij) && !i && (mb_strong[POS_CUR] || mb_strong[POS_LEFT])){
clip_left = uvcbp[POS_LEFT][k] & (MASK_CUR << (2*j+1)) ? clip[POS_LEFT] : 0;
rv40_v_loop_filter(C, s->uvlinesize, j*8,
clip_cur,
clip_left,
alpha, beta, betaC, 1, 1);
}
}
}
}
}
}
/**
* Initialize decoder.
*/
static av_cold int rv40_decode_init(AVCodecContext *avctx)
{
RV34DecContext *r = avctx->priv_data;
r->rv30 = 0;
ff_rv34_decode_init(avctx);
if(!aic_top_vlc.bits)
rv40_init_tables();
r->parse_slice_header = rv40_parse_slice_header;
r->decode_intra_types = rv40_decode_intra_types;
r->decode_mb_info = rv40_decode_mb_info;
r->loop_filter = rv40_loop_filter;
r->luma_dc_quant_i = rv40_luma_dc_quant[0];
r->luma_dc_quant_p = rv40_luma_dc_quant[1];
return 0;
}
AVCodec ff_rv40_decoder = {
"rv40",
AVMEDIA_TYPE_VIDEO,
CODEC_ID_RV40,
sizeof(RV34DecContext),
rv40_decode_init,
NULL,
ff_rv34_decode_end,
ff_rv34_decode_frame,
CODEC_CAP_DR1 | CODEC_CAP_DELAY,
.flush = ff_mpeg_flush,
.long_name = NULL_IF_CONFIG_SMALL("RealVideo 4.0"),
.pix_fmts= ff_pixfmt_list_420,
};
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