Libav 0.7.1
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00001 /* 00002 * H263 internal header 00003 * 00004 * This file is part of Libav. 00005 * 00006 * Libav is free software; you can redistribute it and/or 00007 * modify it under the terms of the GNU Lesser General Public 00008 * License as published by the Free Software Foundation; either 00009 * version 2.1 of the License, or (at your option) any later version. 00010 * 00011 * Libav is distributed in the hope that it will be useful, 00012 * but WITHOUT ANY WARRANTY; without even the implied warranty of 00013 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 00014 * Lesser General Public License for more details. 00015 * 00016 * You should have received a copy of the GNU Lesser General Public 00017 * License along with Libav; if not, write to the Free Software 00018 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 00019 */ 00020 #ifndef AVCODEC_H263_H 00021 #define AVCODEC_H263_H 00022 00023 #include <stdint.h> 00024 #include "libavutil/rational.h" 00025 #include "get_bits.h" 00026 #include "mpegvideo.h" 00027 #include "rl.h" 00028 00029 // The defines below define the number of bits that are read at once for 00030 // reading vlc values. Changing these may improve speed and data cache needs 00031 // be aware though that decreasing them may need the number of stages that is 00032 // passed to get_vlc* to be increased. 00033 #define INTRA_MCBPC_VLC_BITS 6 00034 #define INTER_MCBPC_VLC_BITS 7 00035 #define CBPY_VLC_BITS 6 00036 #define TEX_VLC_BITS 9 00037 00038 extern const AVRational ff_h263_pixel_aspect[16]; 00039 extern const uint8_t ff_h263_cbpy_tab[16][2]; 00040 00041 extern const uint8_t cbpc_b_tab[4][2]; 00042 00043 extern const uint8_t mvtab[33][2]; 00044 00045 extern const uint8_t ff_h263_intra_MCBPC_code[9]; 00046 extern const uint8_t ff_h263_intra_MCBPC_bits[9]; 00047 00048 extern const uint8_t ff_h263_inter_MCBPC_code[28]; 00049 extern const uint8_t ff_h263_inter_MCBPC_bits[28]; 00050 extern const uint8_t h263_mbtype_b_tab[15][2]; 00051 00052 extern VLC ff_h263_intra_MCBPC_vlc; 00053 extern VLC ff_h263_inter_MCBPC_vlc; 00054 extern VLC ff_h263_cbpy_vlc; 00055 00056 extern RLTable ff_h263_rl_inter; 00057 00058 extern RLTable rl_intra_aic; 00059 00060 extern const uint16_t h263_format[8][2]; 00061 extern const uint8_t modified_quant_tab[2][32]; 00062 extern uint16_t ff_mba_max[6]; 00063 extern uint8_t ff_mba_length[7]; 00064 00065 extern uint8_t ff_h263_static_rl_table_store[2][2][2*MAX_RUN + MAX_LEVEL + 3]; 00066 00067 00068 int h263_decode_motion(MpegEncContext * s, int pred, int f_code); 00069 av_const int ff_h263_aspect_to_info(AVRational aspect); 00070 int ff_h263_decode_init(AVCodecContext *avctx); 00071 int ff_h263_decode_frame(AVCodecContext *avctx, 00072 void *data, int *data_size, 00073 AVPacket *avpkt); 00074 int ff_h263_decode_end(AVCodecContext *avctx); 00075 void h263_encode_mb(MpegEncContext *s, 00076 DCTELEM block[6][64], 00077 int motion_x, int motion_y); 00078 void h263_encode_picture_header(MpegEncContext *s, int picture_number); 00079 void h263_encode_gob_header(MpegEncContext * s, int mb_line); 00080 int16_t *h263_pred_motion(MpegEncContext * s, int block, int dir, 00081 int *px, int *py); 00082 void h263_encode_init(MpegEncContext *s); 00083 void h263_decode_init_vlc(MpegEncContext *s); 00084 int h263_decode_picture_header(MpegEncContext *s); 00085 int ff_h263_decode_gob_header(MpegEncContext *s); 00086 void ff_h263_update_motion_val(MpegEncContext * s); 00087 void ff_h263_loop_filter(MpegEncContext * s); 00088 int ff_h263_decode_mba(MpegEncContext *s); 00089 void ff_h263_encode_mba(MpegEncContext *s); 00090 void ff_init_qscale_tab(MpegEncContext *s); 00091 int h263_pred_dc(MpegEncContext * s, int n, int16_t **dc_val_ptr); 00092 void h263_pred_acdc(MpegEncContext * s, DCTELEM *block, int n); 00093 00094 00098 void ff_h263_show_pict_info(MpegEncContext *s); 00099 00100 int ff_intel_h263_decode_picture_header(MpegEncContext *s); 00101 int ff_h263_decode_mb(MpegEncContext *s, 00102 DCTELEM block[6][64]); 00103 00109 int av_const h263_get_picture_format(int width, int height); 00110 00111 void ff_clean_h263_qscales(MpegEncContext *s); 00112 int ff_h263_resync(MpegEncContext *s); 00113 const uint8_t *ff_h263_find_resync_marker(const uint8_t *p, const uint8_t *end); 00114 int ff_h263_get_gob_height(MpegEncContext *s); 00115 void ff_h263_encode_motion(MpegEncContext * s, int val, int f_code); 00116 00117 00118 static inline int h263_get_motion_length(MpegEncContext * s, int val, int f_code){ 00119 int l, bit_size, code; 00120 00121 if (val == 0) { 00122 return mvtab[0][1]; 00123 } else { 00124 bit_size = f_code - 1; 00125 /* modulo encoding */ 00126 l= INT_BIT - 6 - bit_size; 00127 val = (val<<l)>>l; 00128 val--; 00129 code = (val >> bit_size) + 1; 00130 00131 return mvtab[code][1] + 1 + bit_size; 00132 } 00133 } 00134 00135 static inline void ff_h263_encode_motion_vector(MpegEncContext * s, int x, int y, int f_code){ 00136 if(s->flags2 & CODEC_FLAG2_NO_OUTPUT){ 00137 skip_put_bits(&s->pb, 00138 h263_get_motion_length(s, x, f_code) 00139 +h263_get_motion_length(s, y, f_code)); 00140 }else{ 00141 ff_h263_encode_motion(s, x, f_code); 00142 ff_h263_encode_motion(s, y, f_code); 00143 } 00144 } 00145 00146 static inline int get_p_cbp(MpegEncContext * s, 00147 DCTELEM block[6][64], 00148 int motion_x, int motion_y){ 00149 int cbp, i; 00150 00151 if(s->flags & CODEC_FLAG_CBP_RD){ 00152 int best_cbpy_score= INT_MAX; 00153 int best_cbpc_score= INT_MAX; 00154 int cbpc = (-1), cbpy= (-1); 00155 const int offset= (s->mv_type==MV_TYPE_16X16 ? 0 : 16) + (s->dquant ? 8 : 0); 00156 const int lambda= s->lambda2 >> (FF_LAMBDA_SHIFT - 6); 00157 00158 for(i=0; i<4; i++){ 00159 int score= ff_h263_inter_MCBPC_bits[i + offset] * lambda; 00160 if(i&1) score += s->coded_score[5]; 00161 if(i&2) score += s->coded_score[4]; 00162 00163 if(score < best_cbpc_score){ 00164 best_cbpc_score= score; 00165 cbpc= i; 00166 } 00167 } 00168 00169 for(i=0; i<16; i++){ 00170 int score= ff_h263_cbpy_tab[i ^ 0xF][1] * lambda; 00171 if(i&1) score += s->coded_score[3]; 00172 if(i&2) score += s->coded_score[2]; 00173 if(i&4) score += s->coded_score[1]; 00174 if(i&8) score += s->coded_score[0]; 00175 00176 if(score < best_cbpy_score){ 00177 best_cbpy_score= score; 00178 cbpy= i; 00179 } 00180 } 00181 cbp= cbpc + 4*cbpy; 00182 if ((motion_x | motion_y | s->dquant) == 0 && s->mv_type==MV_TYPE_16X16){ 00183 if(best_cbpy_score + best_cbpc_score + 2*lambda >= 0) 00184 cbp= 0; 00185 } 00186 00187 for (i = 0; i < 6; i++) { 00188 if (s->block_last_index[i] >= 0 && ((cbp >> (5 - i))&1)==0 ){ 00189 s->block_last_index[i]= -1; 00190 s->dsp.clear_block(s->block[i]); 00191 } 00192 } 00193 }else{ 00194 cbp= 0; 00195 for (i = 0; i < 6; i++) { 00196 if (s->block_last_index[i] >= 0) 00197 cbp |= 1 << (5 - i); 00198 } 00199 } 00200 return cbp; 00201 } 00202 00203 static inline int get_b_cbp(MpegEncContext * s, DCTELEM block[6][64], 00204 int motion_x, int motion_y, int mb_type){ 00205 int cbp=0, i; 00206 00207 if(s->flags & CODEC_FLAG_CBP_RD){ 00208 int score=0; 00209 const int lambda= s->lambda2 >> (FF_LAMBDA_SHIFT - 6); 00210 00211 for(i=0; i<6; i++){ 00212 if(s->coded_score[i] < 0){ 00213 score += s->coded_score[i]; 00214 cbp |= 1 << (5 - i); 00215 } 00216 } 00217 00218 if(cbp){ 00219 int zero_score= -6; 00220 if ((motion_x | motion_y | s->dquant | mb_type) == 0){ 00221 zero_score-= 4; //2*MV + mb_type + cbp bit 00222 } 00223 00224 zero_score*= lambda; 00225 if(zero_score <= score){ 00226 cbp=0; 00227 } 00228 } 00229 00230 for (i = 0; i < 6; i++) { 00231 if (s->block_last_index[i] >= 0 && ((cbp >> (5 - i))&1)==0 ){ 00232 s->block_last_index[i]= -1; 00233 s->dsp.clear_block(s->block[i]); 00234 } 00235 } 00236 }else{ 00237 for (i = 0; i < 6; i++) { 00238 if (s->block_last_index[i] >= 0) 00239 cbp |= 1 << (5 - i); 00240 } 00241 } 00242 return cbp; 00243 } 00244 00245 static inline void memsetw(short *tab, int val, int n) 00246 { 00247 int i; 00248 for(i=0;i<n;i++) 00249 tab[i] = val; 00250 } 00251 00252 #endif /* AVCODEC_H263_H */