1/* 2 * H263 internal header 3 * 4 * This file is part of FFmpeg. 5 * 6 * FFmpeg is free software; you can redistribute it and/or 7 * modify it under the terms of the GNU Lesser General Public 8 * License as published by the Free Software Foundation; either 9 * version 2.1 of the License, or (at your option) any later version. 10 * 11 * FFmpeg is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 14 * Lesser General Public License for more details. 15 * 16 * You should have received a copy of the GNU Lesser General Public 17 * License along with FFmpeg; if not, write to the Free Software 18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 19 */ 20#ifndef AVCODEC_H263_H 21#define AVCODEC_H263_H 22 23#include <stdint.h> 24#include "libavutil/rational.h" 25#include "get_bits.h" 26#include "mpegvideo.h" 27#include "rl.h" 28 29#if !FF_API_ASPECT_EXTENDED 30#define FF_ASPECT_EXTENDED 15 31#endif 32 33// The defines below define the number of bits that are read at once for 34// reading vlc values. Changing these may improve speed and data cache needs 35// be aware though that decreasing them may need the number of stages that is 36// passed to get_vlc* to be increased. 37#define INTRA_MCBPC_VLC_BITS 6 38#define INTER_MCBPC_VLC_BITS 7 39#define CBPY_VLC_BITS 6 40#define TEX_VLC_BITS 9 41 42extern const AVRational ff_h263_pixel_aspect[16]; 43extern const uint8_t ff_h263_cbpy_tab[16][2]; 44 45extern const uint8_t ff_cbpc_b_tab[4][2]; 46 47extern const uint8_t ff_mvtab[33][2]; 48 49extern const uint8_t ff_h263_intra_MCBPC_code[9]; 50extern const uint8_t ff_h263_intra_MCBPC_bits[9]; 51 52extern const uint8_t ff_h263_inter_MCBPC_code[28]; 53extern const uint8_t ff_h263_inter_MCBPC_bits[28]; 54extern const uint8_t ff_h263_mbtype_b_tab[15][2]; 55 56extern VLC ff_h263_intra_MCBPC_vlc; 57extern VLC ff_h263_inter_MCBPC_vlc; 58extern VLC ff_h263_cbpy_vlc; 59 60extern const uint16_t ff_inter_vlc[103][2]; 61extern const int8_t ff_inter_level[102]; 62extern const int8_t ff_inter_run[102]; 63 64extern RLTable ff_h263_rl_inter; 65 66extern RLTable ff_rl_intra_aic; 67 68extern const uint16_t ff_h263_format[8][2]; 69extern const uint8_t ff_modified_quant_tab[2][32]; 70extern const uint16_t ff_mba_max[6]; 71extern const uint8_t ff_mba_length[7]; 72 73extern uint8_t ff_h263_static_rl_table_store[2][2][2*MAX_RUN + MAX_LEVEL + 3]; 74 75extern const enum AVPixelFormat ff_h263_hwaccel_pixfmt_list_420[]; 76 77 78int ff_h263_decode_motion(MpegEncContext * s, int pred, int f_code); 79av_const int ff_h263_aspect_to_info(AVRational aspect); 80int ff_h263_decode_init(AVCodecContext *avctx); 81int ff_h263_decode_frame(AVCodecContext *avctx, 82 void *data, int *got_frame, 83 AVPacket *avpkt); 84int ff_h263_decode_end(AVCodecContext *avctx); 85void ff_h263_encode_mb(MpegEncContext *s, 86 int16_t block[6][64], 87 int motion_x, int motion_y); 88void ff_h263_encode_picture_header(MpegEncContext *s, int picture_number); 89void ff_h263_encode_gob_header(MpegEncContext * s, int mb_line); 90int16_t *ff_h263_pred_motion(MpegEncContext * s, int block, int dir, 91 int *px, int *py); 92void ff_h263_encode_init(MpegEncContext *s); 93void ff_h263_decode_init_vlc(void); 94int ff_h263_decode_picture_header(MpegEncContext *s); 95int ff_h263_decode_gob_header(MpegEncContext *s); 96void ff_h263_update_motion_val(MpegEncContext * s); 97void ff_h263_loop_filter(MpegEncContext * s); 98int ff_h263_decode_mba(MpegEncContext *s); 99void ff_h263_encode_mba(MpegEncContext *s); 100void ff_init_qscale_tab(MpegEncContext *s); 101int ff_h263_pred_dc(MpegEncContext * s, int n, int16_t **dc_val_ptr); 102void ff_h263_pred_acdc(MpegEncContext * s, int16_t *block, int n); 103 104 105/** 106 * Print picture info if FF_DEBUG_PICT_INFO is set. 107 */ 108void ff_h263_show_pict_info(MpegEncContext *s); 109 110int ff_intel_h263_decode_picture_header(MpegEncContext *s); 111int ff_h263_decode_mb(MpegEncContext *s, 112 int16_t block[6][64]); 113 114/** 115 * Return the value of the 3bit "source format" syntax element. 116 * This represents some standard picture dimensions or indicates that 117 * width&height are explicitly stored later. 118 */ 119int av_const h263_get_picture_format(int width, int height); 120 121void ff_clean_h263_qscales(MpegEncContext *s); 122int ff_h263_resync(MpegEncContext *s); 123int ff_h263_get_gob_height(MpegEncContext *s); 124void ff_h263_encode_motion(MpegEncContext * s, int val, int f_code); 125 126 127static inline int h263_get_motion_length(MpegEncContext * s, int val, int f_code){ 128 int l, bit_size, code; 129 130 if (val == 0) { 131 return ff_mvtab[0][1]; 132 } else { 133 bit_size = f_code - 1; 134 /* modulo encoding */ 135 l= INT_BIT - 6 - bit_size; 136 val = (val<<l)>>l; 137 val--; 138 code = (val >> bit_size) + 1; 139 140 return ff_mvtab[code][1] + 1 + bit_size; 141 } 142} 143 144static inline void ff_h263_encode_motion_vector(MpegEncContext * s, int x, int y, int f_code){ 145 if(s->flags2 & CODEC_FLAG2_NO_OUTPUT){ 146 skip_put_bits(&s->pb, 147 h263_get_motion_length(s, x, f_code) 148 +h263_get_motion_length(s, y, f_code)); 149 }else{ 150 ff_h263_encode_motion(s, x, f_code); 151 ff_h263_encode_motion(s, y, f_code); 152 } 153} 154 155static inline int get_p_cbp(MpegEncContext * s, 156 int16_t block[6][64], 157 int motion_x, int motion_y){ 158 int cbp, i; 159 160 if (s->mpv_flags & FF_MPV_FLAG_CBP_RD) { 161 int best_cbpy_score= INT_MAX; 162 int best_cbpc_score= INT_MAX; 163 int cbpc = (-1), cbpy= (-1); 164 const int offset= (s->mv_type==MV_TYPE_16X16 ? 0 : 16) + (s->dquant ? 8 : 0); 165 const int lambda= s->lambda2 >> (FF_LAMBDA_SHIFT - 6); 166 167 for(i=0; i<4; i++){ 168 int score= ff_h263_inter_MCBPC_bits[i + offset] * lambda; 169 if(i&1) score += s->coded_score[5]; 170 if(i&2) score += s->coded_score[4]; 171 172 if(score < best_cbpc_score){ 173 best_cbpc_score= score; 174 cbpc= i; 175 } 176 } 177 178 for(i=0; i<16; i++){ 179 int score= ff_h263_cbpy_tab[i ^ 0xF][1] * lambda; 180 if(i&1) score += s->coded_score[3]; 181 if(i&2) score += s->coded_score[2]; 182 if(i&4) score += s->coded_score[1]; 183 if(i&8) score += s->coded_score[0]; 184 185 if(score < best_cbpy_score){ 186 best_cbpy_score= score; 187 cbpy= i; 188 } 189 } 190 cbp= cbpc + 4*cbpy; 191 if ((motion_x | motion_y | s->dquant) == 0 && s->mv_type==MV_TYPE_16X16){ 192 if(best_cbpy_score + best_cbpc_score + 2*lambda >= 0) 193 cbp= 0; 194 } 195 196 for (i = 0; i < 6; i++) { 197 if (s->block_last_index[i] >= 0 && ((cbp >> (5 - i))&1)==0 ){ 198 s->block_last_index[i]= -1; 199 s->bdsp.clear_block(s->block[i]); 200 } 201 } 202 }else{ 203 cbp= 0; 204 for (i = 0; i < 6; i++) { 205 if (s->block_last_index[i] >= 0) 206 cbp |= 1 << (5 - i); 207 } 208 } 209 return cbp; 210} 211 212static inline void memsetw(short *tab, int val, int n) 213{ 214 int i; 215 for(i=0;i<n;i++) 216 tab[i] = val; 217} 218 219#endif /* AVCODEC_H263_H */ 220