1 /*****************************************************************************
2 * quant.c: h264 encoder library
3 *****************************************************************************
4 * Copyright (C) 2005-2008 x264 project
6 * Authors: Loren Merritt <lorenm@u.washington.edu>
7 * Christian Heine <sennindemokrit@gmx.net>
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02111, USA.
22 *****************************************************************************/
27 #include "x86/quant.h"
30 # include "ppc/quant.h"
33 #define QUANT_ONE( coef, mf, f ) \
36 (coef) = (f + (coef)) * (mf) >> 16; \
38 (coef) = - ((f - (coef)) * (mf) >> 16); \
41 static void quant_8x8( int16_t dct[8][8], uint16_t mf[64], uint16_t bias[64] )
44 for( i = 0; i < 64; i++ )
45 QUANT_ONE( dct[0][i], mf[i], bias[i] );
48 static void quant_4x4( int16_t dct[4][4], uint16_t mf[16], uint16_t bias[16] )
51 for( i = 0; i < 16; i++ )
52 QUANT_ONE( dct[0][i], mf[i], bias[i] );
55 static void quant_4x4_dc( int16_t dct[4][4], int mf, int bias )
58 for( i = 0; i < 16; i++ )
59 QUANT_ONE( dct[0][i], mf, bias );
62 static void quant_2x2_dc( int16_t dct[2][2], int mf, int bias )
64 QUANT_ONE( dct[0][0], mf, bias );
65 QUANT_ONE( dct[0][1], mf, bias );
66 QUANT_ONE( dct[0][2], mf, bias );
67 QUANT_ONE( dct[0][3], mf, bias );
70 #define DEQUANT_SHL( x ) \
71 dct[y][x] = ( dct[y][x] * dequant_mf[i_mf][y][x] ) << i_qbits
73 #define DEQUANT_SHR( x ) \
74 dct[y][x] = ( dct[y][x] * dequant_mf[i_mf][y][x] + f ) >> (-i_qbits)
76 static void dequant_4x4( int16_t dct[4][4], int dequant_mf[6][4][4], int i_qp )
78 const int i_mf = i_qp%6;
79 const int i_qbits = i_qp/6 - 4;
84 for( y = 0; y < 4; y++ )
94 const int f = 1 << (-i_qbits-1);
95 for( y = 0; y < 4; y++ )
105 static void dequant_8x8( int16_t dct[8][8], int dequant_mf[6][8][8], int i_qp )
107 const int i_mf = i_qp%6;
108 const int i_qbits = i_qp/6 - 6;
113 for( y = 0; y < 8; y++ )
127 const int f = 1 << (-i_qbits-1);
128 for( y = 0; y < 8; y++ )
142 void x264_mb_dequant_4x4_dc( int16_t dct[4][4], int dequant_mf[6][4][4], int i_qp )
144 const int i_qbits = i_qp/6 - 6;
149 const int i_dmf = dequant_mf[i_qp%6][0][0] << i_qbits;
151 for( y = 0; y < 4; y++ )
161 const int i_dmf = dequant_mf[i_qp%6][0][0];
162 const int f = 1 << (-i_qbits-1);
164 for( y = 0; y < 4; y++ )
166 dct[y][0] = ( dct[y][0] * i_dmf + f ) >> (-i_qbits);
167 dct[y][1] = ( dct[y][1] * i_dmf + f ) >> (-i_qbits);
168 dct[y][2] = ( dct[y][2] * i_dmf + f ) >> (-i_qbits);
169 dct[y][3] = ( dct[y][3] * i_dmf + f ) >> (-i_qbits);
174 static void x264_denoise_dct( int16_t *dct, uint32_t *sum, uint16_t *offset, int size )
177 for( i=1; i<size; i++ )
180 int sign = level>>15;
181 level = (level+sign)^sign;
184 dct[i] = level<0 ? 0 : (level^sign)-sign;
189 * x264_mb_decimate_score: given dct coeffs it returns a score to see if we could empty this dct coeffs
190 * to 0 (low score means set it to null)
191 * Used in inter macroblock (luma and chroma)
192 * luma: for a 8x8 block: if score < 4 -> null
193 * for the complete mb: if score < 6 -> null
194 * chroma: for the complete mb: if score < 7 -> null
197 const uint8_t x264_decimate_table4[16] = {
198 3,2,2,1,1,1,0,0,0,0,0,0,0,0,0,0 };
199 const uint8_t x264_decimate_table8[64] = {
200 3,3,3,3,2,2,2,2,2,2,2,2,1,1,1,1,
201 1,1,1,1,1,1,1,1,0,0,0,0,0,0,0,0,
202 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
203 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0 };
205 static int ALWAYS_INLINE x264_decimate_score_internal( int16_t *dct, int i_max )
207 const uint8_t *ds_table = (i_max == 64) ? x264_decimate_table8 : x264_decimate_table4;
211 /* Yes, dct[idx-1] is guaranteed to be 32-bit aligned. idx>=0 instead of 1 works correctly for the same reason */
212 while( idx >= 0 && *(uint32_t*)&dct[idx-1] == 0 )
214 if( idx >= 0 && dct[idx] == 0 )
220 if( (unsigned)(dct[idx--] + 1) > 2 )
224 while( idx >= 0 && dct[idx] == 0 )
229 i_score += ds_table[i_run];
235 static int x264_decimate_score15( int16_t *dct )
237 return x264_decimate_score_internal( dct+1, 15 );
239 static int x264_decimate_score16( int16_t *dct )
241 return x264_decimate_score_internal( dct, 16 );
243 static int x264_decimate_score64( int16_t *dct )
245 return x264_decimate_score_internal( dct, 64 );
248 void x264_quant_init( x264_t *h, int cpu, x264_quant_function_t *pf )
250 pf->quant_8x8 = quant_8x8;
251 pf->quant_4x4 = quant_4x4;
252 pf->quant_4x4_dc = quant_4x4_dc;
253 pf->quant_2x2_dc = quant_2x2_dc;
255 pf->dequant_4x4 = dequant_4x4;
256 pf->dequant_8x8 = dequant_8x8;
258 pf->denoise_dct = x264_denoise_dct;
259 pf->decimate_score15 = x264_decimate_score15;
260 pf->decimate_score16 = x264_decimate_score16;
261 pf->decimate_score64 = x264_decimate_score64;
264 if( cpu&X264_CPU_MMX )
267 pf->quant_4x4 = x264_quant_4x4_mmx;
268 pf->quant_8x8 = x264_quant_8x8_mmx;
269 pf->dequant_4x4 = x264_dequant_4x4_mmx;
270 pf->dequant_8x8 = x264_dequant_8x8_mmx;
271 if( h->param.i_cqm_preset == X264_CQM_FLAT )
273 pf->dequant_4x4 = x264_dequant_4x4_flat16_mmx;
274 pf->dequant_8x8 = x264_dequant_8x8_flat16_mmx;
276 pf->denoise_dct = x264_denoise_dct_mmx;
280 if( cpu&X264_CPU_MMXEXT )
282 pf->quant_2x2_dc = x264_quant_2x2_dc_mmxext;
284 pf->quant_4x4_dc = x264_quant_4x4_dc_mmxext;
285 pf->decimate_score15 = x264_decimate_score15_mmxext;
286 pf->decimate_score16 = x264_decimate_score16_mmxext;
287 pf->decimate_score64 = x264_decimate_score64_mmxext;
291 if( cpu&X264_CPU_SSE2 )
293 pf->quant_4x4_dc = x264_quant_4x4_dc_sse2;
294 pf->quant_4x4 = x264_quant_4x4_sse2;
295 pf->quant_8x8 = x264_quant_8x8_sse2;
296 pf->dequant_4x4 = x264_dequant_4x4_sse2;
297 pf->dequant_8x8 = x264_dequant_8x8_sse2;
298 if( h->param.i_cqm_preset == X264_CQM_FLAT )
300 pf->dequant_4x4 = x264_dequant_4x4_flat16_sse2;
301 pf->dequant_8x8 = x264_dequant_8x8_flat16_sse2;
303 pf->denoise_dct = x264_denoise_dct_sse2;
304 pf->decimate_score15 = x264_decimate_score15_sse2;
305 pf->decimate_score16 = x264_decimate_score16_sse2;
306 pf->decimate_score64 = x264_decimate_score64_sse2;
309 if( cpu&X264_CPU_SSSE3 )
311 pf->quant_2x2_dc = x264_quant_2x2_dc_ssse3;
312 pf->quant_4x4_dc = x264_quant_4x4_dc_ssse3;
313 pf->quant_4x4 = x264_quant_4x4_ssse3;
314 pf->quant_8x8 = x264_quant_8x8_ssse3;
315 pf->denoise_dct = x264_denoise_dct_ssse3;
316 pf->decimate_score15 = x264_decimate_score15_ssse3;
317 pf->decimate_score16 = x264_decimate_score16_ssse3;
318 pf->decimate_score64 = x264_decimate_score64_ssse3;
323 if( cpu&X264_CPU_ALTIVEC ) {
324 pf->quant_2x2_dc = x264_quant_2x2_dc_altivec;
325 pf->quant_4x4_dc = x264_quant_4x4_dc_altivec;
326 pf->quant_4x4 = x264_quant_4x4_altivec;
327 pf->quant_8x8 = x264_quant_8x8_altivec;
329 pf->dequant_4x4 = x264_dequant_4x4_altivec;
330 pf->dequant_8x8 = x264_dequant_8x8_altivec;