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FFmpeg/libavcodec/h264dsp.c

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  1. /*

  2.  * H.26L/H.264/AVC/JVT/14496-10/... encoder/decoder

  3.  * Copyright (c) 2003-2010 Michael Niedermayer <michaelni@gmx.at>

  4.  *

  5.  * This file is part of FFmpeg.

  6.  *

  7.  * FFmpeg is free software; you can redistribute it and/or

  8.  * modify it under the terms of the GNU Lesser General Public

  9.  * License as published by the Free Software Foundation; either

  10.  * version 2.1 of the License, or (at your option) any later version.

  11.  *

  12.  * FFmpeg is distributed in the hope that it will be useful,

  13.  * but WITHOUT ANY WARRANTY; without even the implied warranty of

  14.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

  15.  * Lesser General Public License for more details.

  16.  *

  17.  * You should have received a copy of the GNU Lesser General Public

  18.  * License along with FFmpeg; if not, write to the Free Software

  19.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

  20.  */

  21. 

  22. /**

  23.  * @file

  24.  * H.264 / AVC / MPEG4 part10 DSP functions.

  25.  * @author Michael Niedermayer <michaelni@gmx.at>

  26.  */

  27. 

  28. #include <stdint.h>

  29. #include "avcodec.h"

  30. #include "h264dsp.h"

  31. 

  32. #define op_scale1(x)  block[x] = av_clip_uint8( (block[x]*weight + offset) >> log2_denom )

  33. #define op_scale2(x)  dst[x] = av_clip_uint8( (src[x]*weights + dst[x]*weightd + offset) >> (log2_denom+1))

  34. #define H264_WEIGHT(W,H) \

  35. static void weight_h264_pixels ## W ## x ## H ## _c(uint8_t *block, int stride, int log2_denom, int weight, int offset){ \

  36.     int y; \

  37.     offset <<= log2_denom; \

  38.     if(log2_denom) offset += 1<<(log2_denom-1); \

  39.     for(y=0; y<H; y++, block += stride){ \

  40.         op_scale1(0); \

  41.         op_scale1(1); \

  42.         if(W==2) continue; \

  43.         op_scale1(2); \

  44.         op_scale1(3); \

  45.         if(W==4) continue; \

  46.         op_scale1(4); \

  47.         op_scale1(5); \

  48.         op_scale1(6); \

  49.         op_scale1(7); \

  50.         if(W==8) continue; \

  51.         op_scale1(8); \

  52.         op_scale1(9); \

  53.         op_scale1(10); \

  54.         op_scale1(11); \

  55.         op_scale1(12); \

  56.         op_scale1(13); \

  57.         op_scale1(14); \

  58.         op_scale1(15); \

  59.     } \

  60. } \

  61. static void biweight_h264_pixels ## W ## x ## H ## _c(uint8_t *dst, uint8_t *src, int stride, int log2_denom, int weightd, int weights, int offset){ \

  62.     int y; \

  63.     offset = ((offset + 1) | 1) << log2_denom; \

  64.     for(y=0; y<H; y++, dst += stride, src += stride){ \

  65.         op_scale2(0); \

  66.         op_scale2(1); \

  67.         if(W==2) continue; \

  68.         op_scale2(2); \

  69.         op_scale2(3); \

  70.         if(W==4) continue; \

  71.         op_scale2(4); \

  72.         op_scale2(5); \

  73.         op_scale2(6); \

  74.         op_scale2(7); \

  75.         if(W==8) continue; \

  76.         op_scale2(8); \

  77.         op_scale2(9); \

  78.         op_scale2(10); \

  79.         op_scale2(11); \

  80.         op_scale2(12); \

  81.         op_scale2(13); \

  82.         op_scale2(14); \

  83.         op_scale2(15); \

  84.     } \

  85. }

  86. 

  87. H264_WEIGHT(16,16)

  88. H264_WEIGHT(16,8)

  89. H264_WEIGHT(8,16)

  90. H264_WEIGHT(8,8)

  91. H264_WEIGHT(8,4)

  92. H264_WEIGHT(4,8)

  93. H264_WEIGHT(4,4)

  94. H264_WEIGHT(4,2)

  95. H264_WEIGHT(2,4)

  96. H264_WEIGHT(2,2)

  97. 

  98. #undef op_scale1

  99. #undef op_scale2

  100. #undef H264_WEIGHT

  101. 

  102. static av_always_inline av_flatten void h264_loop_filter_luma_c(uint8_t *pix, int xstride, int ystride, int alpha, int beta, int8_t *tc0)

  103. {

  104.     int i, d;

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

  106.         if( tc0[i] < 0 ) {

  107.             pix += 4*ystride;

  108.             continue;

  109.         }

  110.         for( d = 0; d < 4; d++ ) {

  111.             const int p0 = pix[-1*xstride];

  112.             const int p1 = pix[-2*xstride];

  113.             const int p2 = pix[-3*xstride];

  114.             const int q0 = pix[0];

  115.             const int q1 = pix[1*xstride];

  116.             const int q2 = pix[2*xstride];

  117. 

  118.             if( FFABS( p0 - q0 ) < alpha &&

  119.                 FFABS( p1 - p0 ) < beta &&

  120.                 FFABS( q1 - q0 ) < beta ) {

  121. 

  122.                 int tc = tc0[i];

  123.                 int i_delta;

  124. 

  125.                 if( FFABS( p2 - p0 ) < beta ) {

  126.                     if(tc0[i])

  127.                     pix[-2*xstride] = p1 + av_clip( (( p2 + ( ( p0 + q0 + 1 ) >> 1 ) ) >> 1) - p1, -tc0[i], tc0[i] );

  128.                     tc++;

  129.                 }

  130.                 if( FFABS( q2 - q0 ) < beta ) {

  131.                     if(tc0[i])

  132.                     pix[   xstride] = q1 + av_clip( (( q2 + ( ( p0 + q0 + 1 ) >> 1 ) ) >> 1) - q1, -tc0[i], tc0[i] );

  133.                     tc++;

  134.                 }

  135. 

  136.                 i_delta = av_clip( (((q0 - p0 ) << 2) + (p1 - q1) + 4) >> 3, -tc, tc );

  137.                 pix[-xstride] = av_clip_uint8( p0 + i_delta );    /* p0' */

  138.                 pix[0]        = av_clip_uint8( q0 - i_delta );    /* q0' */

  139.             }

  140.             pix += ystride;

  141.         }

  142.     }

  143. }

  144. static void h264_v_loop_filter_luma_c(uint8_t *pix, int stride, int alpha, int beta, int8_t *tc0)

  145. {

  146.     h264_loop_filter_luma_c(pix, stride, 1, alpha, beta, tc0);

  147. }

  148. static void h264_h_loop_filter_luma_c(uint8_t *pix, int stride, int alpha, int beta, int8_t *tc0)

  149. {

  150.     h264_loop_filter_luma_c(pix, 1, stride, alpha, beta, tc0);

  151. }

  152. 

  153. static av_always_inline av_flatten void h264_loop_filter_luma_intra_c(uint8_t *pix, int xstride, int ystride, int alpha, int beta)

  154. {

  155.     int d;

  156.     for( d = 0; d < 16; d++ ) {

  157.         const int p2 = pix[-3*xstride];

  158.         const int p1 = pix[-2*xstride];

  159.         const int p0 = pix[-1*xstride];

  160. 

  161.         const int q0 = pix[ 0*xstride];

  162.         const int q1 = pix[ 1*xstride];

  163.         const int q2 = pix[ 2*xstride];

  164. 

  165.         if( FFABS( p0 - q0 ) < alpha &&

  166.             FFABS( p1 - p0 ) < beta &&

  167.             FFABS( q1 - q0 ) < beta ) {

  168. 

  169.             if(FFABS( p0 - q0 ) < (( alpha >> 2 ) + 2 )){

  170.                 if( FFABS( p2 - p0 ) < beta)

  171.                 {

  172.                     const int p3 = pix[-4*xstride];

  173.                     /* p0', p1', p2' */

  174.                     pix[-1*xstride] = ( p2 + 2*p1 + 2*p0 + 2*q0 + q1 + 4 ) >> 3;

  175.                     pix[-2*xstride] = ( p2 + p1 + p0 + q0 + 2 ) >> 2;

  176.                     pix[-3*xstride] = ( 2*p3 + 3*p2 + p1 + p0 + q0 + 4 ) >> 3;

  177.                 } else {

  178.                     /* p0' */

  179.                     pix[-1*xstride] = ( 2*p1 + p0 + q1 + 2 ) >> 2;

  180.                 }

  181.                 if( FFABS( q2 - q0 ) < beta)

  182.                 {

  183.                     const int q3 = pix[3*xstride];

  184.                     /* q0', q1', q2' */

  185.                     pix[0*xstride] = ( p1 + 2*p0 + 2*q0 + 2*q1 + q2 + 4 ) >> 3;

  186.                     pix[1*xstride] = ( p0 + q0 + q1 + q2 + 2 ) >> 2;

  187.                     pix[2*xstride] = ( 2*q3 + 3*q2 + q1 + q0 + p0 + 4 ) >> 3;

  188.                 } else {

  189.                     /* q0' */

  190.                     pix[0*xstride] = ( 2*q1 + q0 + p1 + 2 ) >> 2;

  191.                 }

  192.             }else{

  193.                 /* p0', q0' */

  194.                 pix[-1*xstride] = ( 2*p1 + p0 + q1 + 2 ) >> 2;

  195.                 pix[ 0*xstride] = ( 2*q1 + q0 + p1 + 2 ) >> 2;

  196.             }

  197.         }

  198.         pix += ystride;

  199.     }

  200. }

  201. static void h264_v_loop_filter_luma_intra_c(uint8_t *pix, int stride, int alpha, int beta)

  202. {

  203.     h264_loop_filter_luma_intra_c(pix, stride, 1, alpha, beta);

  204. }

  205. static void h264_h_loop_filter_luma_intra_c(uint8_t *pix, int stride, int alpha, int beta)

  206. {

  207.     h264_loop_filter_luma_intra_c(pix, 1, stride, alpha, beta);

  208. }

  209. 

  210. static av_always_inline av_flatten void h264_loop_filter_chroma_c(uint8_t *pix, int xstride, int ystride, int alpha, int beta, int8_t *tc0)

  211. {

  212.     int i, d;

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

  214.         const int tc = tc0[i];

  215.         if( tc <= 0 ) {

  216.             pix += 2*ystride;

  217.             continue;

  218.         }

  219.         for( d = 0; d < 2; d++ ) {

  220.             const int p0 = pix[-1*xstride];

  221.             const int p1 = pix[-2*xstride];

  222.             const int q0 = pix[0];

  223.             const int q1 = pix[1*xstride];

  224. 

  225.             if( FFABS( p0 - q0 ) < alpha &&

  226.                 FFABS( p1 - p0 ) < beta &&

  227.                 FFABS( q1 - q0 ) < beta ) {

  228. 

  229.                 int delta = av_clip( (((q0 - p0 ) << 2) + (p1 - q1) + 4) >> 3, -tc, tc );

  230. 

  231.                 pix[-xstride] = av_clip_uint8( p0 + delta );    /* p0' */

  232.                 pix[0]        = av_clip_uint8( q0 - delta );    /* q0' */

  233.             }

  234.             pix += ystride;

  235.         }

  236.     }

  237. }

  238. static void h264_v_loop_filter_chroma_c(uint8_t *pix, int stride, int alpha, int beta, int8_t *tc0)

  239. {

  240.     h264_loop_filter_chroma_c(pix, stride, 1, alpha, beta, tc0);

  241. }

  242. static void h264_h_loop_filter_chroma_c(uint8_t *pix, int stride, int alpha, int beta, int8_t *tc0)

  243. {

  244.     h264_loop_filter_chroma_c(pix, 1, stride, alpha, beta, tc0);

  245. }

  246. 

  247. static av_always_inline av_flatten void h264_loop_filter_chroma_intra_c(uint8_t *pix, int xstride, int ystride, int alpha, int beta)

  248. {

  249.     int d;

  250.     for( d = 0; d < 8; d++ ) {

  251.         const int p0 = pix[-1*xstride];

  252.         const int p1 = pix[-2*xstride];

  253.         const int q0 = pix[0];

  254.         const int q1 = pix[1*xstride];

  255. 

  256.         if( FFABS( p0 - q0 ) < alpha &&

  257.             FFABS( p1 - p0 ) < beta &&

  258.             FFABS( q1 - q0 ) < beta ) {

  259. 

  260.             pix[-xstride] = ( 2*p1 + p0 + q1 + 2 ) >> 2;   /* p0' */

  261.             pix[0]        = ( 2*q1 + q0 + p1 + 2 ) >> 2;   /* q0' */

  262.         }

  263.         pix += ystride;

  264.     }

  265. }

  266. static void h264_v_loop_filter_chroma_intra_c(uint8_t *pix, int stride, int alpha, int beta)

  267. {

  268.     h264_loop_filter_chroma_intra_c(pix, stride, 1, alpha, beta);

  269. }

  270. static void h264_h_loop_filter_chroma_intra_c(uint8_t *pix, int stride, int alpha, int beta)

  271. {

  272.     h264_loop_filter_chroma_intra_c(pix, 1, stride, alpha, beta);

  273. }

  274. 

  275. void ff_h264dsp_init(H264DSPContext *c)

  276. {

  277.     c->h264_idct_add= ff_h264_idct_add_c;

  278.     c->h264_idct8_add= ff_h264_idct8_add_c;

  279.     c->h264_idct_dc_add= ff_h264_idct_dc_add_c;

  280.     c->h264_idct8_dc_add= ff_h264_idct8_dc_add_c;

  281.     c->h264_idct_add16     = ff_h264_idct_add16_c;

  282.     c->h264_idct8_add4     = ff_h264_idct8_add4_c;

  283.     c->h264_idct_add8      = ff_h264_idct_add8_c;

  284.     c->h264_idct_add16intra= ff_h264_idct_add16intra_c;

  285. 

  286.     c->weight_h264_pixels_tab[0]= weight_h264_pixels16x16_c;

  287.     c->weight_h264_pixels_tab[1]= weight_h264_pixels16x8_c;

  288.     c->weight_h264_pixels_tab[2]= weight_h264_pixels8x16_c;

  289.     c->weight_h264_pixels_tab[3]= weight_h264_pixels8x8_c;

  290.     c->weight_h264_pixels_tab[4]= weight_h264_pixels8x4_c;

  291.     c->weight_h264_pixels_tab[5]= weight_h264_pixels4x8_c;

  292.     c->weight_h264_pixels_tab[6]= weight_h264_pixels4x4_c;

  293.     c->weight_h264_pixels_tab[7]= weight_h264_pixels4x2_c;

  294.     c->weight_h264_pixels_tab[8]= weight_h264_pixels2x4_c;

  295.     c->weight_h264_pixels_tab[9]= weight_h264_pixels2x2_c;

  296.     c->biweight_h264_pixels_tab[0]= biweight_h264_pixels16x16_c;

  297.     c->biweight_h264_pixels_tab[1]= biweight_h264_pixels16x8_c;

  298.     c->biweight_h264_pixels_tab[2]= biweight_h264_pixels8x16_c;

  299.     c->biweight_h264_pixels_tab[3]= biweight_h264_pixels8x8_c;

  300.     c->biweight_h264_pixels_tab[4]= biweight_h264_pixels8x4_c;

  301.     c->biweight_h264_pixels_tab[5]= biweight_h264_pixels4x8_c;

  302.     c->biweight_h264_pixels_tab[6]= biweight_h264_pixels4x4_c;

  303.     c->biweight_h264_pixels_tab[7]= biweight_h264_pixels4x2_c;

  304.     c->biweight_h264_pixels_tab[8]= biweight_h264_pixels2x4_c;

  305.     c->biweight_h264_pixels_tab[9]= biweight_h264_pixels2x2_c;

  306. 

  307.     c->h264_v_loop_filter_luma= h264_v_loop_filter_luma_c;

  308.     c->h264_h_loop_filter_luma= h264_h_loop_filter_luma_c;

  309.     c->h264_v_loop_filter_luma_intra= h264_v_loop_filter_luma_intra_c;

  310.     c->h264_h_loop_filter_luma_intra= h264_h_loop_filter_luma_intra_c;

  311.     c->h264_v_loop_filter_chroma= h264_v_loop_filter_chroma_c;

  312.     c->h264_h_loop_filter_chroma= h264_h_loop_filter_chroma_c;

  313.     c->h264_v_loop_filter_chroma_intra= h264_v_loop_filter_chroma_intra_c;

  314.     c->h264_h_loop_filter_chroma_intra= h264_h_loop_filter_chroma_intra_c;

  315.     c->h264_loop_filter_strength= NULL;

  316. 

  317.     if (ARCH_ARM) ff_h264dsp_init_arm(c);

  318.     if (HAVE_ALTIVEC) ff_h264dsp_init_ppc(c);

  319.     if (HAVE_MMX) ff_h264dsp_init_x86(c);

  320. }