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  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. // The defines below define the number of bits that are read at once for
  30. // reading vlc values. Changing these may improve speed and data cache needs
  31. // be aware though that decreasing them may need the number of stages that is
  32. // passed to get_vlc* to be increased.
  33. #define INTRA_MCBPC_VLC_BITS 6
  34. #define INTER_MCBPC_VLC_BITS 7
  35. #define CBPY_VLC_BITS 6
  36. #define TEX_VLC_BITS 9
  37.  
  38. extern const AVRational ff_h263_pixel_aspect[16];
  39. extern const uint8_t ff_h263_cbpy_tab[16][2];
  40.  
  41. extern const uint8_t ff_cbpc_b_tab[4][2];
  42.  
  43. extern const uint8_t ff_mvtab[33][2];
  44.  
  45. extern const uint8_t ff_h263_intra_MCBPC_code[9];
  46. extern const uint8_t ff_h263_intra_MCBPC_bits[9];
  47.  
  48. extern const uint8_t ff_h263_inter_MCBPC_code[28];
  49. extern const uint8_t ff_h263_inter_MCBPC_bits[28];
  50. extern const uint8_t ff_h263_mbtype_b_tab[15][2];
  51.  
  52. extern VLC ff_h263_intra_MCBPC_vlc;
  53. extern VLC ff_h263_inter_MCBPC_vlc;
  54. extern VLC ff_h263_cbpy_vlc;
  55.  
  56. extern const uint16_t ff_inter_vlc[103][2];
  57. extern const int8_t ff_inter_level[102];
  58. extern const int8_t ff_inter_run[102];
  59.  
  60. extern RLTable ff_h263_rl_inter;
  61.  
  62. extern RLTable ff_rl_intra_aic;
  63.  
  64. extern const uint16_t ff_h263_format[8][2];
  65. extern const uint8_t ff_modified_quant_tab[2][32];
  66. extern const uint16_t ff_mba_max[6];
  67. extern const uint8_t ff_mba_length[7];
  68.  
  69. extern uint8_t ff_h263_static_rl_table_store[2][2][2*MAX_RUN + MAX_LEVEL + 3];
  70.  
  71. extern const enum AVPixelFormat ff_h263_hwaccel_pixfmt_list_420[];
  72.  
  73.  
  74. int ff_h263_decode_motion(MpegEncContext * s, int pred, int f_code);
  75. av_const int ff_h263_aspect_to_info(AVRational aspect);
  76. int ff_h263_decode_init(AVCodecContext *avctx);
  77. int ff_h263_decode_frame(AVCodecContext *avctx,
  78.                              void *data, int *got_frame,
  79.                              AVPacket *avpkt);
  80. int ff_h263_decode_end(AVCodecContext *avctx);
  81. void ff_h263_encode_mb(MpegEncContext *s,
  82.                        int16_t block[6][64],
  83.                        int motion_x, int motion_y);
  84. void ff_h263_encode_picture_header(MpegEncContext *s, int picture_number);
  85. void ff_h263_encode_gob_header(MpegEncContext * s, int mb_line);
  86. int16_t *ff_h263_pred_motion(MpegEncContext * s, int block, int dir,
  87.                              int *px, int *py);
  88. void ff_h263_encode_init(MpegEncContext *s);
  89. void ff_h263_decode_init_vlc(void);
  90. int ff_h263_decode_picture_header(MpegEncContext *s);
  91. int ff_h263_decode_gob_header(MpegEncContext *s);
  92. void ff_h263_update_motion_val(MpegEncContext * s);
  93. void ff_h263_loop_filter(MpegEncContext * s);
  94. int ff_h263_decode_mba(MpegEncContext *s);
  95. void ff_h263_encode_mba(MpegEncContext *s);
  96. void ff_init_qscale_tab(MpegEncContext *s);
  97. int ff_h263_pred_dc(MpegEncContext * s, int n, int16_t **dc_val_ptr);
  98. void ff_h263_pred_acdc(MpegEncContext * s, int16_t *block, int n);
  99.  
  100.  
  101. /**
  102.  * Print picture info if FF_DEBUG_PICT_INFO is set.
  103.  */
  104. void ff_h263_show_pict_info(MpegEncContext *s);
  105.  
  106. int ff_intel_h263_decode_picture_header(MpegEncContext *s);
  107. int ff_h263_decode_mb(MpegEncContext *s,
  108.                       int16_t block[6][64]);
  109.  
  110. /**
  111.  * Return the value of the 3bit "source format" syntax element.
  112.  * This represents some standard picture dimensions or indicates that
  113.  * width&height are explicitly stored later.
  114.  */
  115. int av_const h263_get_picture_format(int width, int height);
  116.  
  117. void ff_clean_h263_qscales(MpegEncContext *s);
  118. int ff_h263_resync(MpegEncContext *s);
  119. const uint8_t *ff_h263_find_resync_marker(MpegEncContext *s, const uint8_t *p, const uint8_t *end);
  120. int ff_h263_get_gob_height(MpegEncContext *s);
  121. void ff_h263_encode_motion(MpegEncContext * s, int val, int f_code);
  122.  
  123.  
  124. static inline int h263_get_motion_length(MpegEncContext * s, int val, int f_code){
  125.     int l, bit_size, code;
  126.  
  127.     if (val == 0) {
  128.         return ff_mvtab[0][1];
  129.     } else {
  130.         bit_size = f_code - 1;
  131.         /* modulo encoding */
  132.         l= INT_BIT - 6 - bit_size;
  133.         val = (val<<l)>>l;
  134.         val--;
  135.         code = (val >> bit_size) + 1;
  136.  
  137.         return ff_mvtab[code][1] + 1 + bit_size;
  138.     }
  139. }
  140.  
  141. static inline void ff_h263_encode_motion_vector(MpegEncContext * s, int x, int y, int f_code){
  142.     if(s->flags2 & CODEC_FLAG2_NO_OUTPUT){
  143.         skip_put_bits(&s->pb,
  144.             h263_get_motion_length(s, x, f_code)
  145.            +h263_get_motion_length(s, y, f_code));
  146.     }else{
  147.         ff_h263_encode_motion(s, x, f_code);
  148.         ff_h263_encode_motion(s, y, f_code);
  149.     }
  150. }
  151.  
  152. static inline int get_p_cbp(MpegEncContext * s,
  153.                       int16_t block[6][64],
  154.                       int motion_x, int motion_y){
  155.     int cbp, i;
  156.  
  157.     if (s->mpv_flags & FF_MPV_FLAG_CBP_RD) {
  158.         int best_cbpy_score= INT_MAX;
  159.         int best_cbpc_score= INT_MAX;
  160.         int cbpc = (-1), cbpy= (-1);
  161.         const int offset= (s->mv_type==MV_TYPE_16X16 ? 0 : 16) + (s->dquant ? 8 : 0);
  162.         const int lambda= s->lambda2 >> (FF_LAMBDA_SHIFT - 6);
  163.  
  164.         for(i=0; i<4; i++){
  165.             int score= ff_h263_inter_MCBPC_bits[i + offset] * lambda;
  166.             if(i&1) score += s->coded_score[5];
  167.             if(i&2) score += s->coded_score[4];
  168.  
  169.             if(score < best_cbpc_score){
  170.                 best_cbpc_score= score;
  171.                 cbpc= i;
  172.             }
  173.         }
  174.  
  175.         for(i=0; i<16; i++){
  176.             int score= ff_h263_cbpy_tab[i ^ 0xF][1] * lambda;
  177.             if(i&1) score += s->coded_score[3];
  178.             if(i&2) score += s->coded_score[2];
  179.             if(i&4) score += s->coded_score[1];
  180.             if(i&8) score += s->coded_score[0];
  181.  
  182.             if(score < best_cbpy_score){
  183.                 best_cbpy_score= score;
  184.                 cbpy= i;
  185.             }
  186.         }
  187.         cbp= cbpc + 4*cbpy;
  188.         if ((motion_x | motion_y | s->dquant) == 0 && s->mv_type==MV_TYPE_16X16){
  189.             if(best_cbpy_score + best_cbpc_score + 2*lambda >= 0)
  190.                 cbp= 0;
  191.         }
  192.  
  193.         for (i = 0; i < 6; i++) {
  194.             if (s->block_last_index[i] >= 0 && ((cbp >> (5 - i))&1)==0 ){
  195.                 s->block_last_index[i]= -1;
  196.                 s->dsp.clear_block(s->block[i]);
  197.             }
  198.         }
  199.     }else{
  200.         cbp= 0;
  201.         for (i = 0; i < 6; i++) {
  202.             if (s->block_last_index[i] >= 0)
  203.                 cbp |= 1 << (5 - i);
  204.         }
  205.     }
  206.     return cbp;
  207. }
  208.  
  209. static inline void memsetw(short *tab, int val, int n)
  210. {
  211.     int i;
  212.     for(i=0;i<n;i++)
  213.         tab[i] = val;
  214. }
  215.  
  216. #endif /* AVCODEC_H263_H */
  217.