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218b3ae970
ffmpeg/libavcodec/cavs.h
Stefan Gehrer 218b3ae970 move dequantization into its own inline function 
Originally committed as revision 9518 to svn://svn.ffmpeg.org/ffmpeg/trunk
2007-07-07 07:14:58 +00:00

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/*
* Chinese AVS video (AVS1-P2, JiZhun profile) decoder.
* Copyright (c) 2006 Stefan Gehrer <stefan.gehrer@gmx.de>
*
* 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
*/
#ifndef CAVS_H
#define CAVS_H
#include "dsputil.h"
#include "mpegvideo.h"
#define SLICE_MIN_START_CODE 0x00000101
#define SLICE_MAX_START_CODE 0x000001af
#define EXT_START_CODE 0x000001b5
#define USER_START_CODE 0x000001b2
#define CAVS_START_CODE 0x000001b0
#define PIC_I_START_CODE 0x000001b3
#define PIC_PB_START_CODE 0x000001b6
#define A_AVAIL 1
#define B_AVAIL 2
#define C_AVAIL 4
#define D_AVAIL 8
#define NOT_AVAIL -1
#define REF_INTRA -2
#define REF_DIR -3
#define ESCAPE_CODE 59
#define FWD0 0x01
#define FWD1 0x02
#define BWD0 0x04
#define BWD1 0x08
#define SYM0 0x10
#define SYM1 0x20
#define SPLITH 0x40
#define SPLITV 0x80
#define MV_BWD_OFFS 12
#define MV_STRIDE 4
enum mb_t {
I_8X8 = 0,
P_SKIP,
P_16X16,
P_16X8,
P_8X16,
P_8X8,
B_SKIP,
B_DIRECT,
B_FWD_16X16,
B_BWD_16X16,
B_SYM_16X16,
B_8X8 = 29
};
enum sub_mb_t {
B_SUB_DIRECT,
B_SUB_FWD,
B_SUB_BWD,
B_SUB_SYM
};
enum intra_luma_t {
INTRA_L_VERT,
INTRA_L_HORIZ,
INTRA_L_LP,
INTRA_L_DOWN_LEFT,
INTRA_L_DOWN_RIGHT,
INTRA_L_LP_LEFT,
INTRA_L_LP_TOP,
INTRA_L_DC_128
};
enum intra_chroma_t {
INTRA_C_LP,
INTRA_C_HORIZ,
INTRA_C_VERT,
INTRA_C_PLANE,
INTRA_C_LP_LEFT,
INTRA_C_LP_TOP,
INTRA_C_DC_128,
};
enum mv_pred_t {
MV_PRED_MEDIAN,
MV_PRED_LEFT,
MV_PRED_TOP,
MV_PRED_TOPRIGHT,
MV_PRED_PSKIP,
MV_PRED_BSKIP
};
enum block_t {
BLK_16X16,
BLK_16X8,
BLK_8X16,
BLK_8X8
};
enum mv_loc_t {
MV_FWD_D3 = 0,
MV_FWD_B2,
MV_FWD_B3,
MV_FWD_C2,
MV_FWD_A1,
MV_FWD_X0,
MV_FWD_X1,
MV_FWD_A3 = 8,
MV_FWD_X2,
MV_FWD_X3,
MV_BWD_D3 = MV_BWD_OFFS,
MV_BWD_B2,
MV_BWD_B3,
MV_BWD_C2,
MV_BWD_A1,
MV_BWD_X0,
MV_BWD_X1,
MV_BWD_A3 = MV_BWD_OFFS+8,
MV_BWD_X2,
MV_BWD_X3
};
DECLARE_ALIGNED_8(typedef, struct) {
int16_t x;
int16_t y;
int16_t dist;
int16_t ref;
} vector_t;
typedef struct dec_2dvlc_t {
int8_t rltab[59][3];
int8_t level_add[27];
int8_t golomb_order;
int inc_limit;
int8_t max_run;
} dec_2dvlc_t;
typedef struct {
MpegEncContext s;
Picture picture; ///< currently decoded frame
Picture DPB[2]; ///< reference frames
int dist[2]; ///< temporal distances from current frame to ref frames
int profile, level;
int aspect_ratio;
int mb_width, mb_height;
int pic_type;
int progressive;
int pic_structure;
int skip_mode_flag; ///< select between skip_count or one skip_flag per MB
int loop_filter_disable;
int alpha_offset, beta_offset;
int ref_flag;
int mbx, mby; ///< macroblock coordinates
int flags; ///< availability flags of neighbouring macroblocks
int stc; ///< last start code
uint8_t *cy, *cu, *cv; ///< current MB sample pointers
int left_qp;
uint8_t *top_qp;
/** mv motion vector cache
0: D3 B2 B3 C2
4: A1 X0 X1 -
8: A3 X2 X3 -
X are the vectors in the current macroblock (5,6,9,10)
A is the macroblock to the left (4,8)
B is the macroblock to the top (1,2)
C is the macroblock to the top-right (3)
D is the macroblock to the top-left (0)
the same is repeated for backward motion vectors */
vector_t mv[2*4*3];
vector_t *top_mv[2];
vector_t *col_mv;
/** luma pred mode cache
0: -- B2 B3
3: A1 X0 X1
6: A3 X2 X3 */
int pred_mode_Y[3*3];
int *top_pred_Y;
int l_stride, c_stride;
int luma_scan[4];
int qp;
int qp_fixed;
int cbp;
ScanTable scantable;
/** intra prediction is done with un-deblocked samples
they are saved here before deblocking the MB */
uint8_t *top_border_y, *top_border_u, *top_border_v;
uint8_t left_border_y[26], left_border_u[10], left_border_v[10];
uint8_t intern_border_y[26];
uint8_t topleft_border_y, topleft_border_u, topleft_border_v;
void (*intra_pred_l[8])(uint8_t *d,uint8_t *top,uint8_t *left,int stride);
void (*intra_pred_c[7])(uint8_t *d,uint8_t *top,uint8_t *left,int stride);
uint8_t *col_type_base;
uint8_t *col_type;
/* scaling factors for MV prediction */
int sym_factor; ///< for scaling in symmetrical B block
int direct_den[2]; ///< for scaling in direct B block
int scale_den[2]; ///< for scaling neighbouring MVs
int got_keyframe;
DCTELEM *block;
} AVSContext;
extern const int_fast8_t ff_left_modifier_l[8];
extern const int_fast8_t ff_top_modifier_l[8];
extern const int_fast8_t ff_left_modifier_c[7];
extern const int_fast8_t ff_top_modifier_c[7];
extern const vector_t ff_cavs_intra_mv;
extern const vector_t ff_cavs_un_mv;
static inline void load_intra_pred_luma(AVSContext *h, uint8_t *top,
uint8_t **left, int block) {
int i;
switch(block) {
case 0:
*left = h->left_border_y;
h->left_border_y[0] = h->left_border_y[1];
memset(&h->left_border_y[17],h->left_border_y[16],9);
memcpy(&top[1],&h->top_border_y[h->mbx*16],16);
top[17] = top[16];
top[0] = top[1];
if((h->flags & A_AVAIL) && (h->flags & B_AVAIL))
h->left_border_y[0] = top[0] = h->topleft_border_y;
break;
case 1:
*left = h->intern_border_y;
for(i=0;i<8;i++)
h->intern_border_y[i+1] = *(h->cy + 7 + i*h->l_stride);
memset(&h->intern_border_y[9],h->intern_border_y[8],9);
h->intern_border_y[0] = h->intern_border_y[1];
memcpy(&top[1],&h->top_border_y[h->mbx*16+8],8);
if(h->flags & C_AVAIL)
memcpy(&top[9],&h->top_border_y[(h->mbx + 1)*16],8);
else
memset(&top[9],top[8],9);
top[17] = top[16];
top[0] = top[1];
if(h->flags & B_AVAIL)
h->intern_border_y[0] = top[0] = h->top_border_y[h->mbx*16+7];
break;
case 2:
*left = &h->left_border_y[8];
memcpy(&top[1],h->cy + 7*h->l_stride,16);
top[17] = top[16];
top[0] = top[1];
if(h->flags & A_AVAIL)
top[0] = h->left_border_y[8];
break;
case 3:
*left = &h->intern_border_y[8];
for(i=0;i<8;i++)
h->intern_border_y[i+9] = *(h->cy + 7 + (i+8)*h->l_stride);
memset(&h->intern_border_y[17],h->intern_border_y[16],9);
memcpy(&top[0],h->cy + 7 + 7*h->l_stride,9);
memset(&top[9],top[8],9);
break;
}
}
static inline void load_intra_pred_chroma(AVSContext *h) {
/* extend borders by one pixel */
h->left_border_u[9] = h->left_border_u[8];
h->left_border_v[9] = h->left_border_v[8];
h->top_border_u[h->mbx*10+9] = h->top_border_u[h->mbx*10+8];
h->top_border_v[h->mbx*10+9] = h->top_border_v[h->mbx*10+8];
if(h->mbx && h->mby) {
h->top_border_u[h->mbx*10] = h->left_border_u[0] = h->topleft_border_u;
h->top_border_v[h->mbx*10] = h->left_border_v[0] = h->topleft_border_v;
} else {
h->left_border_u[0] = h->left_border_u[1];
h->left_border_v[0] = h->left_border_v[1];
h->top_border_u[h->mbx*10] = h->top_border_u[h->mbx*10+1];
h->top_border_v[h->mbx*10] = h->top_border_v[h->mbx*10+1];
}
}
static inline void modify_pred(const int_fast8_t *mod_table, int *mode) {
*mode = mod_table[*mode];
if(*mode < 0) {
av_log(NULL, AV_LOG_ERROR, "Illegal intra prediction mode\n");
*mode = 0;
}
}
static inline void modify_mb_i(AVSContext *h, int *pred_mode_uv) {
/* save pred modes before they get modified */
h->pred_mode_Y[3] = h->pred_mode_Y[5];
h->pred_mode_Y[6] = h->pred_mode_Y[8];
h->top_pred_Y[h->mbx*2+0] = h->pred_mode_Y[7];
h->top_pred_Y[h->mbx*2+1] = h->pred_mode_Y[8];
/* modify pred modes according to availability of neighbour samples */
if(!(h->flags & A_AVAIL)) {
modify_pred(ff_left_modifier_l, &h->pred_mode_Y[4] );
modify_pred(ff_left_modifier_l, &h->pred_mode_Y[7] );
modify_pred(ff_left_modifier_c, pred_mode_uv );
}
if(!(h->flags & B_AVAIL)) {
modify_pred(ff_top_modifier_l, &h->pred_mode_Y[4] );
modify_pred(ff_top_modifier_l, &h->pred_mode_Y[5] );
modify_pred(ff_top_modifier_c, pred_mode_uv );
}
}
static inline void set_intra_mode_default(AVSContext *h) {
h->pred_mode_Y[3] = h->pred_mode_Y[6] = INTRA_L_LP;
h->top_pred_Y[h->mbx*2+0] = h->top_pred_Y[h->mbx*2+1] = INTRA_L_LP;
}
static inline void set_mvs(vector_t *mv, enum block_t size) {
switch(size) {
case BLK_16X16:
mv[MV_STRIDE ] = mv[0];
mv[MV_STRIDE+1] = mv[0];
case BLK_16X8:
mv[1] = mv[0];
break;
case BLK_8X16:
mv[MV_STRIDE] = mv[0];
break;
}
}
static inline void set_mv_intra(AVSContext *h) {
h->mv[MV_FWD_X0] = ff_cavs_intra_mv;
set_mvs(&h->mv[MV_FWD_X0], BLK_16X16);
h->mv[MV_BWD_X0] = ff_cavs_intra_mv;
set_mvs(&h->mv[MV_BWD_X0], BLK_16X16);
if(h->pic_type != FF_B_TYPE)
*h->col_type = I_8X8;
}
/**
* initialise predictors for motion vectors and intra prediction
*/
static inline void init_mb(AVSContext *h) {
int i;
/* copy predictors from top line (MB B and C) into cache */
for(i=0;i<3;i++) {
h->mv[MV_FWD_B2+i] = h->top_mv[0][h->mbx*2+i];
h->mv[MV_BWD_B2+i] = h->top_mv[1][h->mbx*2+i];
}
h->pred_mode_Y[1] = h->top_pred_Y[h->mbx*2+0];
h->pred_mode_Y[2] = h->top_pred_Y[h->mbx*2+1];
/* clear top predictors if MB B is not available */
if(!(h->flags & B_AVAIL)) {
h->mv[MV_FWD_B2] = ff_cavs_un_mv;
h->mv[MV_FWD_B3] = ff_cavs_un_mv;
h->mv[MV_BWD_B2] = ff_cavs_un_mv;
h->mv[MV_BWD_B3] = ff_cavs_un_mv;
h->pred_mode_Y[1] = h->pred_mode_Y[2] = NOT_AVAIL;
h->flags &= ~(C_AVAIL|D_AVAIL);
} else if(h->mbx) {
h->flags |= D_AVAIL;
}
if(h->mbx == h->mb_width-1) //MB C not available
h->flags &= ~C_AVAIL;
/* clear top-right predictors if MB C is not available */
if(!(h->flags & C_AVAIL)) {
h->mv[MV_FWD_C2] = ff_cavs_un_mv;
h->mv[MV_BWD_C2] = ff_cavs_un_mv;
}
/* clear top-left predictors if MB D is not available */
if(!(h->flags & D_AVAIL)) {
h->mv[MV_FWD_D3] = ff_cavs_un_mv;
h->mv[MV_BWD_D3] = ff_cavs_un_mv;
}
/* set pointer for co-located macroblock type */
h->col_type = &h->col_type_base[h->mby*h->mb_width + h->mbx];
}
static inline void check_for_slice(AVSContext *h);
/**
* save predictors for later macroblocks and increase
* macroblock address
* @returns 0 if end of frame is reached, 1 otherwise
*/
static inline int next_mb(AVSContext *h) {
int i;
h->flags |= A_AVAIL;
h->cy += 16;
h->cu += 8;
h->cv += 8;
/* copy mvs as predictors to the left */
for(i=0;i<=20;i+=4)
h->mv[i] = h->mv[i+2];
/* copy bottom mvs from cache to top line */
h->top_mv[0][h->mbx*2+0] = h->mv[MV_FWD_X2];
h->top_mv[0][h->mbx*2+1] = h->mv[MV_FWD_X3];
h->top_mv[1][h->mbx*2+0] = h->mv[MV_BWD_X2];
h->top_mv[1][h->mbx*2+1] = h->mv[MV_BWD_X3];
/* next MB address */
h->mbx++;
if(h->mbx == h->mb_width) { //new mb line
h->flags = B_AVAIL|C_AVAIL;
/* clear left pred_modes */
h->pred_mode_Y[3] = h->pred_mode_Y[6] = NOT_AVAIL;
/* clear left mv predictors */
for(i=0;i<=20;i+=4)
h->mv[i] = ff_cavs_un_mv;
h->mbx = 0;
h->mby++;
/* re-calculate sample pointers */
h->cy = h->picture.data[0] + h->mby*16*h->l_stride;
h->cu = h->picture.data[1] + h->mby*8*h->c_stride;
h->cv = h->picture.data[2] + h->mby*8*h->c_stride;
if(h->mby == h->mb_height) { //frame end
return 0;
} else {
//check_for_slice(h);
}
}
return 1;
}
static inline int dequant(AVSContext *h, DCTELEM *level_buf, uint8_t *run_buf,
DCTELEM *dst, int mul, int shift, int coeff_num) {
int round = 1 << (shift - 1);
int pos = -1;
const uint8_t *scantab = h->scantable.permutated;
/* inverse scan and dequantization */
while(--coeff_num >= 0){
pos += run_buf[coeff_num];
if(pos > 63) {
av_log(h->s.avctx, AV_LOG_ERROR,
"position out of block bounds at pic %d MB(%d,%d)\n",
h->picture.poc, h->mbx, h->mby);
return -1;
}
dst[scantab[pos]] = (level_buf[coeff_num]*mul + round) >> shift;
}
return 0;
}
#endif /* CAVS_H */
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