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/*
* H.263 internal header
*
* This file is part of Libav.
*
* Libav 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.
*
* Libav 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 Libav; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef AVCODEC_H263_H
#define AVCODEC_H263_H
#include <stdint.h>
#include "libavutil/rational.h"
#include "get_bits.h"
#include "mpegvideo.h"
#include "h263data.h"
#include "rl.h"
#if !FF_API_ASPECT_EXTENDED
#define FF_ASPECT_EXTENDED 15
#endif
#define INT_BIT (CHAR_BIT * sizeof(int))
// The defines below define the number of bits that are read at once for
// reading vlc values. Changing these may improve speed and data cache needs
// be aware though that decreasing them may need the number of stages that is
// passed to get_vlc* to be increased.
#define INTRA_MCBPC_VLC_BITS 6
#define INTER_MCBPC_VLC_BITS 7
#define CBPY_VLC_BITS 6
#define TEX_VLC_BITS 9
#define H263_GOB_HEIGHT(h) ((h) <= 400 ? 1 : (h) <= 800 ? 2 : 4)
extern VLC ff_h263_intra_MCBPC_vlc;
extern VLC ff_h263_inter_MCBPC_vlc;
extern VLC ff_h263_cbpy_vlc;
extern const enum AVPixelFormat ff_h263_hwaccel_pixfmt_list_420[];
int ff_h263_decode_motion(MpegEncContext * s, int pred, int f_code);
av_const int ff_h263_aspect_to_info(AVRational aspect);
int ff_h263_decode_init(AVCodecContext *avctx);
int ff_h263_decode_frame(AVCodecContext *avctx,
void *data, int *got_frame,
AVPacket *avpkt);
int ff_h263_decode_end(AVCodecContext *avctx);
void ff_h263_encode_mb(MpegEncContext *s,
int16_t block[6][64],
int motion_x, int motion_y);
void ff_h263_encode_picture_header(MpegEncContext *s, int picture_number);
void ff_h263_encode_gob_header(MpegEncContext * s, int mb_line);
int16_t *ff_h263_pred_motion(MpegEncContext * s, int block, int dir,
int *px, int *py);
void ff_h263_encode_init(MpegEncContext *s);
void ff_h263_decode_init_vlc(void);
int ff_h263_decode_picture_header(MpegEncContext *s);
int ff_h263_decode_gob_header(MpegEncContext *s);
void ff_h263_update_motion_val(MpegEncContext * s);
void ff_h263_loop_filter(MpegEncContext * s);
int ff_h263_decode_mba(MpegEncContext *s);
void ff_h263_encode_mba(MpegEncContext *s);
void ff_init_qscale_tab(MpegEncContext *s);
int ff_h263_pred_dc(MpegEncContext * s, int n, int16_t **dc_val_ptr);
void ff_h263_pred_acdc(MpegEncContext * s, int16_t *block, int n);
/**
* Print picture info if FF_DEBUG_PICT_INFO is set.
*/
void ff_h263_show_pict_info(MpegEncContext *s);
int ff_intel_h263_decode_picture_header(MpegEncContext *s);
int ff_h263_decode_mb(MpegEncContext *s,
int16_t block[6][64]);
/**
* Return the value of the 3-bit "source format" syntax element.
* This represents some standard picture dimensions or indicates that
* width&height are explicitly stored later.
*/
int av_const h263_get_picture_format(int width, int height);
void ff_clean_h263_qscales(MpegEncContext *s);
int ff_h263_resync(MpegEncContext *s);
const uint8_t *ff_h263_find_resync_marker(const uint8_t *p, const uint8_t *end);
void ff_h263_encode_motion(MpegEncContext * s, int val, int f_code);
static inline int h263_get_motion_length(MpegEncContext * s, int val, int f_code){
int l, bit_size, code;
if (val == 0) {
return ff_mvtab[0][1];
} else {
bit_size = f_code - 1;
/* modulo encoding */
l= INT_BIT - 6 - bit_size;
val = (val<<l)>>l;
val--;
code = (val >> bit_size) + 1;
return ff_mvtab[code][1] + 1 + bit_size;
}
}
static inline void ff_h263_encode_motion_vector(MpegEncContext * s, int x, int y, int f_code){
if (s->avctx->flags2 & AV_CODEC_FLAG2_NO_OUTPUT) {
skip_put_bits(&s->pb,
h263_get_motion_length(s, x, f_code)
+h263_get_motion_length(s, y, f_code));
}else{
ff_h263_encode_motion(s, x, f_code);
ff_h263_encode_motion(s, y, f_code);
}
}
static inline int get_p_cbp(MpegEncContext * s,
int16_t block[6][64],
int motion_x, int motion_y){
int cbp, i;
if (s->mpv_flags & FF_MPV_FLAG_CBP_RD) {
int best_cbpy_score= INT_MAX;
int best_cbpc_score= INT_MAX;
int cbpc = (-1), cbpy= (-1);
const int offset= (s->mv_type==MV_TYPE_16X16 ? 0 : 16) + (s->dquant ? 8 : 0);
const int lambda= s->lambda2 >> (FF_LAMBDA_SHIFT - 6);
for(i=0; i<4; i++){
int score= ff_h263_inter_MCBPC_bits[i + offset] * lambda;
if(i&1) score += s->coded_score[5];
if(i&2) score += s->coded_score[4];
if(score < best_cbpc_score){
best_cbpc_score= score;
cbpc= i;
}
}
for(i=0; i<16; i++){
int score= ff_h263_cbpy_tab[i ^ 0xF][1] * lambda;
if(i&1) score += s->coded_score[3];
if(i&2) score += s->coded_score[2];
if(i&4) score += s->coded_score[1];
if(i&8) score += s->coded_score[0];
if(score < best_cbpy_score){
best_cbpy_score= score;
cbpy= i;
}
}
cbp= cbpc + 4*cbpy;
if ((motion_x | motion_y | s->dquant) == 0 && s->mv_type==MV_TYPE_16X16){
if(best_cbpy_score + best_cbpc_score + 2*lambda >= 0)
cbp= 0;
}
for (i = 0; i < 6; i++) {
if (s->block_last_index[i] >= 0 && ((cbp >> (5 - i))&1)==0 ){
s->block_last_index[i]= -1;
s->bdsp.clear_block(s->block[i]);
}
}
}else{
cbp= 0;
for (i = 0; i < 6; i++) {
if (s->block_last_index[i] >= 0)
cbp |= 1 << (5 - i);
}
}
return cbp;
}
#endif /* AVCODEC_H263_H */
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