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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 "h263data.h"
  28. #include "rl.h"
  29.  
  30. #if !FF_API_ASPECT_EXTENDED
  31. #define FF_ASPECT_EXTENDED 15
  32. #endif
  33. #define INT_BIT (CHAR_BIT * sizeof(int))
  34.  
  35. // The defines below define the number of bits that are read at once for
  36. // reading vlc values. Changing these may improve speed and data cache needs
  37. // be aware though that decreasing them may need the number of stages that is
  38. // passed to get_vlc* to be increased.
  39. #define INTRA_MCBPC_VLC_BITS 6
  40. #define INTER_MCBPC_VLC_BITS 7
  41. #define CBPY_VLC_BITS 6
  42. #define TEX_VLC_BITS 9
  43.  
  44. #define H263_GOB_HEIGHT(h) ((h) <= 400 ? 1 : (h) <= 800 ? 2 : 4)
  45.  
  46. extern VLC ff_h263_intra_MCBPC_vlc;
  47. extern VLC ff_h263_inter_MCBPC_vlc;
  48. extern VLC ff_h263_cbpy_vlc;
  49.  
  50. extern const enum AVPixelFormat ff_h263_hwaccel_pixfmt_list_420[];
  51.  
  52.  
  53. int ff_h263_decode_motion(MpegEncContext * s, int pred, int f_code);
  54. av_const int ff_h263_aspect_to_info(AVRational aspect);
  55. int ff_h263_decode_init(AVCodecContext *avctx);
  56. int ff_h263_decode_frame(AVCodecContext *avctx,
  57.                              void *data, int *got_frame,
  58.                              AVPacket *avpkt);
  59. int ff_h263_decode_end(AVCodecContext *avctx);
  60. void ff_h263_encode_mb(MpegEncContext *s,
  61.                        int16_t block[6][64],
  62.                        int motion_x, int motion_y);
  63. void ff_h263_encode_picture_header(MpegEncContext *s, int picture_number);
  64. void ff_h263_encode_gob_header(MpegEncContext * s, int mb_line);
  65. int16_t *ff_h263_pred_motion(MpegEncContext * s, int block, int dir,
  66.                              int *px, int *py);
  67. void ff_h263_encode_init(MpegEncContext *s);
  68. void ff_h263_decode_init_vlc(void);
  69. int ff_h263_decode_picture_header(MpegEncContext *s);
  70. int ff_h263_decode_gob_header(MpegEncContext *s);
  71. void ff_h263_update_motion_val(MpegEncContext * s);
  72. void ff_h263_loop_filter(MpegEncContext * s);
  73. int ff_h263_decode_mba(MpegEncContext *s);
  74. void ff_h263_encode_mba(MpegEncContext *s);
  75. void ff_init_qscale_tab(MpegEncContext *s);
  76. int ff_h263_pred_dc(MpegEncContext * s, int n, int16_t **dc_val_ptr);
  77. void ff_h263_pred_acdc(MpegEncContext * s, int16_t *block, int n);
  78.  
  79.  
  80. /**
  81.  * Print picture info if FF_DEBUG_PICT_INFO is set.
  82.  */
  83. void ff_h263_show_pict_info(MpegEncContext *s);
  84.  
  85. int ff_intel_h263_decode_picture_header(MpegEncContext *s);
  86. int ff_h263_decode_mb(MpegEncContext *s,
  87.                       int16_t block[6][64]);
  88.  
  89. /**
  90.  * Return the value of the 3bit "source format" syntax element.
  91.  * This represents some standard picture dimensions or indicates that
  92.  * width&height are explicitly stored later.
  93.  */
  94. int av_const h263_get_picture_format(int width, int height);
  95.  
  96. void ff_clean_h263_qscales(MpegEncContext *s);
  97. int ff_h263_resync(MpegEncContext *s);
  98. void ff_h263_encode_motion(PutBitContext *pb, int val, int f_code);
  99.  
  100.  
  101. static inline int h263_get_motion_length(int val, int f_code){
  102.     int l, bit_size, code;
  103.  
  104.     if (val == 0) {
  105.         return ff_mvtab[0][1];
  106.     } else {
  107.         bit_size = f_code - 1;
  108.         /* modulo encoding */
  109.         l= INT_BIT - 6 - bit_size;
  110.         val = (val<<l)>>l;
  111.         val--;
  112.         code = (val >> bit_size) + 1;
  113.  
  114.         return ff_mvtab[code][1] + 1 + bit_size;
  115.     }
  116. }
  117.  
  118. static inline void ff_h263_encode_motion_vector(MpegEncContext * s, int x, int y, int f_code){
  119.     if (s->avctx->flags2 & AV_CODEC_FLAG2_NO_OUTPUT) {
  120.         skip_put_bits(&s->pb,
  121.             h263_get_motion_length(x, f_code)
  122.            +h263_get_motion_length(y, f_code));
  123.     }else{
  124.         ff_h263_encode_motion(&s->pb, x, f_code);
  125.         ff_h263_encode_motion(&s->pb, y, f_code);
  126.     }
  127. }
  128.  
  129. static inline int get_p_cbp(MpegEncContext * s,
  130.                       int16_t block[6][64],
  131.                       int motion_x, int motion_y){
  132.     int cbp, i;
  133.  
  134.     if (s->mpv_flags & FF_MPV_FLAG_CBP_RD) {
  135.         int best_cbpy_score= INT_MAX;
  136.         int best_cbpc_score= INT_MAX;
  137.         int cbpc = (-1), cbpy= (-1);
  138.         const int offset= (s->mv_type==MV_TYPE_16X16 ? 0 : 16) + (s->dquant ? 8 : 0);
  139.         const int lambda= s->lambda2 >> (FF_LAMBDA_SHIFT - 6);
  140.  
  141.         for(i=0; i<4; i++){
  142.             int score= ff_h263_inter_MCBPC_bits[i + offset] * lambda;
  143.             if(i&1) score += s->coded_score[5];
  144.             if(i&2) score += s->coded_score[4];
  145.  
  146.             if(score < best_cbpc_score){
  147.                 best_cbpc_score= score;
  148.                 cbpc= i;
  149.             }
  150.         }
  151.  
  152.         for(i=0; i<16; i++){
  153.             int score= ff_h263_cbpy_tab[i ^ 0xF][1] * lambda;
  154.             if(i&1) score += s->coded_score[3];
  155.             if(i&2) score += s->coded_score[2];
  156.             if(i&4) score += s->coded_score[1];
  157.             if(i&8) score += s->coded_score[0];
  158.  
  159.             if(score < best_cbpy_score){
  160.                 best_cbpy_score= score;
  161.                 cbpy= i;
  162.             }
  163.         }
  164.         cbp= cbpc + 4*cbpy;
  165.         if ((motion_x | motion_y | s->dquant) == 0 && s->mv_type==MV_TYPE_16X16){
  166.             if(best_cbpy_score + best_cbpc_score + 2*lambda >= 0)
  167.                 cbp= 0;
  168.         }
  169.  
  170.         for (i = 0; i < 6; i++) {
  171.             if (s->block_last_index[i] >= 0 && ((cbp >> (5 - i))&1)==0 ){
  172.                 s->block_last_index[i]= -1;
  173.                 s->bdsp.clear_block(s->block[i]);
  174.             }
  175.         }
  176.     }else{
  177.         cbp= 0;
  178.         for (i = 0; i < 6; i++) {
  179.             if (s->block_last_index[i] >= 0)
  180.                 cbp |= 1 << (5 - i);
  181.         }
  182.     }
  183.     return cbp;
  184. }
  185.  
  186. #endif /* AVCODEC_H263_H */
  187.