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FFmpeg/libavcodec/h263.h

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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 RLTable ff_h263_rl_inter;

  57. 

  58. extern RLTable ff_rl_intra_aic;

  59. 

  60. extern const uint16_t ff_h263_format[8][2];

  61. extern const uint8_t ff_modified_quant_tab[2][32];

  62. extern const uint16_t ff_mba_max[6];

  63. extern const uint8_t ff_mba_length[7];

  64. 

  65. extern uint8_t ff_h263_static_rl_table_store[2][2][2*MAX_RUN + MAX_LEVEL + 3];

  66. 

  67. 

  68. int ff_h263_decode_motion(MpegEncContext * s, int pred, int f_code);

  69. av_const int ff_h263_aspect_to_info(AVRational aspect);

  70. int ff_h263_decode_init(AVCodecContext *avctx);

  71. int ff_h263_decode_frame(AVCodecContext *avctx,

  72.                              void *data, int *data_size,

  73.                              AVPacket *avpkt);

  74. int ff_h263_decode_end(AVCodecContext *avctx);

  75. void ff_h263_encode_mb(MpegEncContext *s,

  76.                        DCTELEM block[6][64],

  77.                        int motion_x, int motion_y);

  78. void ff_h263_encode_picture_header(MpegEncContext *s, int picture_number);

  79. void ff_h263_encode_gob_header(MpegEncContext * s, int mb_line);

  80. int16_t *ff_h263_pred_motion(MpegEncContext * s, int block, int dir,

  81.                              int *px, int *py);

  82. void ff_h263_encode_init(MpegEncContext *s);

  83. void ff_h263_decode_init_vlc(MpegEncContext *s);

  84. int ff_h263_decode_picture_header(MpegEncContext *s);

  85. int ff_h263_decode_gob_header(MpegEncContext *s);

  86. void ff_h263_update_motion_val(MpegEncContext * s);

  87. void ff_h263_loop_filter(MpegEncContext * s);

  88. int ff_h263_decode_mba(MpegEncContext *s);

  89. void ff_h263_encode_mba(MpegEncContext *s);

  90. void ff_init_qscale_tab(MpegEncContext *s);

  91. int ff_h263_pred_dc(MpegEncContext * s, int n, int16_t **dc_val_ptr);

  92. void ff_h263_pred_acdc(MpegEncContext * s, DCTELEM *block, int n);

  93. 

  94. 

  95. /**

  96.  * Print picture info if FF_DEBUG_PICT_INFO is set.

  97.  */

  98. void ff_h263_show_pict_info(MpegEncContext *s);

  99. 

  100. int ff_intel_h263_decode_picture_header(MpegEncContext *s);

  101. int ff_h263_decode_mb(MpegEncContext *s,

  102.                       DCTELEM block[6][64]);

  103. 

  104. /**

  105.  * Return the value of the 3bit "source format" syntax element.

  106.  * This represents some standard picture dimensions or indicates that

  107.  * width&height are explicitly stored later.

  108.  */

  109. int av_const h263_get_picture_format(int width, int height);

  110. 

  111. void ff_clean_h263_qscales(MpegEncContext *s);

  112. int ff_h263_resync(MpegEncContext *s);

  113. const uint8_t *ff_h263_find_resync_marker(const uint8_t *p, const uint8_t *end);

  114. int ff_h263_get_gob_height(MpegEncContext *s);

  115. void ff_h263_encode_motion(MpegEncContext * s, int val, int f_code);

  116. 

  117. 

  118. static inline int h263_get_motion_length(MpegEncContext * s, int val, int f_code){

  119.     int l, bit_size, code;

  120. 

  121.     if (val == 0) {

  122.         return ff_mvtab[0][1];

  123.     } else {

  124.         bit_size = f_code - 1;

  125.         /* modulo encoding */

  126.         l= INT_BIT - 6 - bit_size;

  127.         val = (val<<l)>>l;

  128.         val--;

  129.         code = (val >> bit_size) + 1;

  130. 

  131.         return ff_mvtab[code][1] + 1 + bit_size;

  132.     }

  133. }

  134. 

  135. static inline void ff_h263_encode_motion_vector(MpegEncContext * s, int x, int y, int f_code){

  136.     if(s->flags2 & CODEC_FLAG2_NO_OUTPUT){

  137.         skip_put_bits(&s->pb,

  138.             h263_get_motion_length(s, x, f_code)

  139.            +h263_get_motion_length(s, y, f_code));

  140.     }else{

  141.         ff_h263_encode_motion(s, x, f_code);

  142.         ff_h263_encode_motion(s, y, f_code);

  143.     }

  144. }

  145. 

  146. static inline int get_p_cbp(MpegEncContext * s,

  147.                       DCTELEM block[6][64],

  148.                       int motion_x, int motion_y){

  149.     int cbp, i;

  150. 

  151.     if (s->mpv_flags & FF_MPV_FLAG_CBP_RD) {

  152.         int best_cbpy_score= INT_MAX;

  153.         int best_cbpc_score= INT_MAX;

  154.         int cbpc = (-1), cbpy= (-1);

  155.         const int offset= (s->mv_type==MV_TYPE_16X16 ? 0 : 16) + (s->dquant ? 8 : 0);

  156.         const int lambda= s->lambda2 >> (FF_LAMBDA_SHIFT - 6);

  157. 

  158.         for(i=0; i<4; i++){

  159.             int score= ff_h263_inter_MCBPC_bits[i + offset] * lambda;

  160.             if(i&1) score += s->coded_score[5];

  161.             if(i&2) score += s->coded_score[4];

  162. 

  163.             if(score < best_cbpc_score){

  164.                 best_cbpc_score= score;

  165.                 cbpc= i;

  166.             }

  167.         }

  168. 

  169.         for(i=0; i<16; i++){

  170.             int score= ff_h263_cbpy_tab[i ^ 0xF][1] * lambda;

  171.             if(i&1) score += s->coded_score[3];

  172.             if(i&2) score += s->coded_score[2];

  173.             if(i&4) score += s->coded_score[1];

  174.             if(i&8) score += s->coded_score[0];

  175. 

  176.             if(score < best_cbpy_score){

  177.                 best_cbpy_score= score;

  178.                 cbpy= i;

  179.             }

  180.         }

  181.         cbp= cbpc + 4*cbpy;

  182.         if ((motion_x | motion_y | s->dquant) == 0 && s->mv_type==MV_TYPE_16X16){

  183.             if(best_cbpy_score + best_cbpc_score + 2*lambda >= 0)

  184.                 cbp= 0;

  185.         }

  186. 

  187.         for (i = 0; i < 6; i++) {

  188.             if (s->block_last_index[i] >= 0 && ((cbp >> (5 - i))&1)==0 ){

  189.                 s->block_last_index[i]= -1;

  190.                 s->dsp.clear_block(s->block[i]);

  191.             }

  192.         }

  193.     }else{

  194.         cbp= 0;

  195.         for (i = 0; i < 6; i++) {

  196.             if (s->block_last_index[i] >= 0)

  197.                 cbp |= 1 << (5 - i);

  198.         }

  199.     }

  200.     return cbp;

  201. }

  202. 

  203. static inline void memsetw(short *tab, int val, int n)

  204. {

  205.     int i;

  206.     for(i=0;i<n;i++)

  207.         tab[i] = val;

  208. }

  209. 

  210. #endif /* AVCODEC_H263_H */