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ac3dsp_init.c
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1 /*
2  * x86-optimized AC-3 DSP functions
3  * Copyright (c) 2011 Justin Ruggles
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 #include "libavutil/attributes.h"
23 #include "libavutil/mem.h"
24 #include "libavutil/x86/asm.h"
25 #include "libavutil/x86/cpu.h"
26 #include "libavcodec/ac3.h"
27 #include "libavcodec/ac3dsp.h"
28 
29 void ff_ac3_exponent_min_mmx (uint8_t *exp, int num_reuse_blocks, int nb_coefs);
30 void ff_ac3_exponent_min_mmxext(uint8_t *exp, int num_reuse_blocks, int nb_coefs);
31 void ff_ac3_exponent_min_sse2 (uint8_t *exp, int num_reuse_blocks, int nb_coefs);
32 
33 int ff_ac3_max_msb_abs_int16_mmx (const int16_t *src, int len);
34 int ff_ac3_max_msb_abs_int16_mmxext(const int16_t *src, int len);
35 int ff_ac3_max_msb_abs_int16_sse2 (const int16_t *src, int len);
36 int ff_ac3_max_msb_abs_int16_ssse3(const int16_t *src, int len);
37 
38 void ff_ac3_lshift_int16_mmx (int16_t *src, unsigned int len, unsigned int shift);
39 void ff_ac3_lshift_int16_sse2(int16_t *src, unsigned int len, unsigned int shift);
40 
41 void ff_ac3_rshift_int32_mmx (int32_t *src, unsigned int len, unsigned int shift);
42 void ff_ac3_rshift_int32_sse2(int32_t *src, unsigned int len, unsigned int shift);
43 
44 void ff_float_to_fixed24_3dnow(int32_t *dst, const float *src, unsigned int len);
45 void ff_float_to_fixed24_sse (int32_t *dst, const float *src, unsigned int len);
46 void ff_float_to_fixed24_sse2 (int32_t *dst, const float *src, unsigned int len);
47 
48 int ff_ac3_compute_mantissa_size_sse2(uint16_t mant_cnt[6][16]);
49 
50 void ff_ac3_extract_exponents_3dnow(uint8_t *exp, int32_t *coef, int nb_coefs);
51 void ff_ac3_extract_exponents_sse2 (uint8_t *exp, int32_t *coef, int nb_coefs);
52 void ff_ac3_extract_exponents_ssse3(uint8_t *exp, int32_t *coef, int nb_coefs);
53 
54 void ff_apply_window_int16_round_mmxext(int16_t *output, const int16_t *input,
55  const int16_t *window, unsigned int len);
56 void ff_apply_window_int16_round_sse2(int16_t *output, const int16_t *input,
57  const int16_t *window, unsigned int len);
58 void ff_apply_window_int16_mmxext(int16_t *output, const int16_t *input,
59  const int16_t *window, unsigned int len);
60 void ff_apply_window_int16_sse2(int16_t *output, const int16_t *input,
61  const int16_t *window, unsigned int len);
62 void ff_apply_window_int16_ssse3(int16_t *output, const int16_t *input,
63  const int16_t *window, unsigned int len);
64 void ff_apply_window_int16_ssse3_atom(int16_t *output, const int16_t *input,
65  const int16_t *window, unsigned int len);
66 
67 #if ARCH_X86_32 && defined(__INTEL_COMPILER)
68 # undef HAVE_7REGS
69 # define HAVE_7REGS 0
70 #endif
71 
72 #if HAVE_SSE_INLINE && HAVE_7REGS
73 
74 #define IF1(x) x
75 #define IF0(x)
76 
77 #define MIX5(mono, stereo) \
78  __asm__ volatile ( \
79  "movss 0(%1), %%xmm5 \n" \
80  "movss 8(%1), %%xmm6 \n" \
81  "movss 24(%1), %%xmm7 \n" \
82  "shufps $0, %%xmm5, %%xmm5 \n" \
83  "shufps $0, %%xmm6, %%xmm6 \n" \
84  "shufps $0, %%xmm7, %%xmm7 \n" \
85  "1: \n" \
86  "movaps (%0, %2), %%xmm0 \n" \
87  "movaps (%0, %3), %%xmm1 \n" \
88  "movaps (%0, %4), %%xmm2 \n" \
89  "movaps (%0, %5), %%xmm3 \n" \
90  "movaps (%0, %6), %%xmm4 \n" \
91  "mulps %%xmm5, %%xmm0 \n" \
92  "mulps %%xmm6, %%xmm1 \n" \
93  "mulps %%xmm5, %%xmm2 \n" \
94  "mulps %%xmm7, %%xmm3 \n" \
95  "mulps %%xmm7, %%xmm4 \n" \
96  stereo("addps %%xmm1, %%xmm0 \n") \
97  "addps %%xmm1, %%xmm2 \n" \
98  "addps %%xmm3, %%xmm0 \n" \
99  "addps %%xmm4, %%xmm2 \n" \
100  mono("addps %%xmm2, %%xmm0 \n") \
101  "movaps %%xmm0, (%0, %2) \n" \
102  stereo("movaps %%xmm2, (%0, %3) \n") \
103  "add $16, %0 \n" \
104  "jl 1b \n" \
105  : "+&r"(i) \
106  : "r"(matrix), \
107  "r"(samples[0] + len), \
108  "r"(samples[1] + len), \
109  "r"(samples[2] + len), \
110  "r"(samples[3] + len), \
111  "r"(samples[4] + len) \
112  : XMM_CLOBBERS("%xmm0", "%xmm1", "%xmm2", "%xmm3", \
113  "%xmm4", "%xmm5", "%xmm6", "%xmm7",) \
114  "memory" \
115  );
116 
117 #define MIX_MISC(stereo) \
118  __asm__ volatile ( \
119  "mov %5, %2 \n" \
120  "1: \n" \
121  "mov -%c7(%6, %2, %c8), %3 \n" \
122  "movaps (%3, %0), %%xmm0 \n" \
123  stereo("movaps %%xmm0, %%xmm1 \n") \
124  "mulps %%xmm4, %%xmm0 \n" \
125  stereo("mulps %%xmm5, %%xmm1 \n") \
126  "2: \n" \
127  "mov (%6, %2, %c8), %1 \n" \
128  "movaps (%1, %0), %%xmm2 \n" \
129  stereo("movaps %%xmm2, %%xmm3 \n") \
130  "mulps (%4, %2, 8), %%xmm2 \n" \
131  stereo("mulps 16(%4, %2, 8), %%xmm3 \n") \
132  "addps %%xmm2, %%xmm0 \n" \
133  stereo("addps %%xmm3, %%xmm1 \n") \
134  "add $4, %2 \n" \
135  "jl 2b \n" \
136  "mov %5, %2 \n" \
137  stereo("mov (%6, %2, %c8), %1 \n") \
138  "movaps %%xmm0, (%3, %0) \n" \
139  stereo("movaps %%xmm1, (%1, %0) \n") \
140  "add $16, %0 \n" \
141  "jl 1b \n" \
142  : "+&r"(i), "=&r"(j), "=&r"(k), "=&r"(m) \
143  : "r"(matrix_simd + in_ch), \
144  "g"((intptr_t) - 4 * (in_ch - 1)), \
145  "r"(samp + in_ch), \
146  "i"(sizeof(float *)), "i"(sizeof(float *)/4) \
147  : "memory" \
148  );
149 
150 static void ac3_downmix_sse(float **samples, float (*matrix)[2],
151  int out_ch, int in_ch, int len)
152 {
153  int (*matrix_cmp)[2] = (int(*)[2])matrix;
154  intptr_t i, j, k, m;
155 
156  i = -len * sizeof(float);
157  if (in_ch == 5 && out_ch == 2 &&
158  !(matrix_cmp[0][1] | matrix_cmp[2][0] |
159  matrix_cmp[3][1] | matrix_cmp[4][0] |
160  (matrix_cmp[1][0] ^ matrix_cmp[1][1]) |
161  (matrix_cmp[0][0] ^ matrix_cmp[2][1]))) {
162  MIX5(IF0, IF1);
163  } else if (in_ch == 5 && out_ch == 1 &&
164  matrix_cmp[0][0] == matrix_cmp[2][0] &&
165  matrix_cmp[3][0] == matrix_cmp[4][0]) {
166  MIX5(IF1, IF0);
167  } else {
168  DECLARE_ALIGNED(16, float, matrix_simd)[AC3_MAX_CHANNELS][2][4];
169  float *samp[AC3_MAX_CHANNELS];
170 
171  for (j = 0; j < in_ch; j++)
172  samp[j] = samples[j] + len;
173 
174  j = 2 * in_ch * sizeof(float);
175  __asm__ volatile (
176  "1: \n"
177  "sub $8, %0 \n"
178  "movss (%2, %0), %%xmm4 \n"
179  "movss 4(%2, %0), %%xmm5 \n"
180  "shufps $0, %%xmm4, %%xmm4 \n"
181  "shufps $0, %%xmm5, %%xmm5 \n"
182  "movaps %%xmm4, (%1, %0, 4) \n"
183  "movaps %%xmm5, 16(%1, %0, 4) \n"
184  "jg 1b \n"
185  : "+&r"(j)
186  : "r"(matrix_simd), "r"(matrix)
187  : "memory"
188  );
189  if (out_ch == 2) {
190  MIX_MISC(IF1);
191  } else {
192  MIX_MISC(IF0);
193  }
194  }
195 }
196 
197 #endif /* HAVE_SSE_INLINE && HAVE_7REGS */
198 
199 av_cold void ff_ac3dsp_init_x86(AC3DSPContext *c, int bit_exact)
200 {
201  int cpu_flags = av_get_cpu_flags();
202 
203  if (EXTERNAL_MMX(cpu_flags)) {
204  c->ac3_exponent_min = ff_ac3_exponent_min_mmx;
205  c->ac3_max_msb_abs_int16 = ff_ac3_max_msb_abs_int16_mmx;
206  c->ac3_lshift_int16 = ff_ac3_lshift_int16_mmx;
207  c->ac3_rshift_int32 = ff_ac3_rshift_int32_mmx;
208  }
209  if (EXTERNAL_AMD3DNOW(cpu_flags)) {
210  if (!bit_exact) {
211  c->float_to_fixed24 = ff_float_to_fixed24_3dnow;
212  }
213  }
214  if (EXTERNAL_MMXEXT(cpu_flags)) {
215  c->ac3_exponent_min = ff_ac3_exponent_min_mmxext;
216  c->ac3_max_msb_abs_int16 = ff_ac3_max_msb_abs_int16_mmxext;
217  if (bit_exact) {
218  c->apply_window_int16 = ff_apply_window_int16_mmxext;
219  } else {
220  c->apply_window_int16 = ff_apply_window_int16_round_mmxext;
221  }
222  }
223  if (EXTERNAL_SSE(cpu_flags)) {
224  c->float_to_fixed24 = ff_float_to_fixed24_sse;
225  }
226  if (EXTERNAL_SSE2(cpu_flags)) {
227  c->ac3_exponent_min = ff_ac3_exponent_min_sse2;
228  c->ac3_max_msb_abs_int16 = ff_ac3_max_msb_abs_int16_sse2;
229  c->float_to_fixed24 = ff_float_to_fixed24_sse2;
230  c->compute_mantissa_size = ff_ac3_compute_mantissa_size_sse2;
231  c->extract_exponents = ff_ac3_extract_exponents_sse2;
232  if (!(cpu_flags & AV_CPU_FLAG_SSE2SLOW)) {
233  c->ac3_lshift_int16 = ff_ac3_lshift_int16_sse2;
234  c->ac3_rshift_int32 = ff_ac3_rshift_int32_sse2;
235  }
236  if (bit_exact) {
237  c->apply_window_int16 = ff_apply_window_int16_sse2;
238  } else if (!(cpu_flags & AV_CPU_FLAG_SSE2SLOW)) {
239  c->apply_window_int16 = ff_apply_window_int16_round_sse2;
240  }
241  }
242  if (EXTERNAL_SSSE3(cpu_flags)) {
243  c->ac3_max_msb_abs_int16 = ff_ac3_max_msb_abs_int16_ssse3;
244  if (cpu_flags & AV_CPU_FLAG_ATOM) {
245  c->apply_window_int16 = ff_apply_window_int16_ssse3_atom;
246  } else {
247  c->extract_exponents = ff_ac3_extract_exponents_ssse3;
248  c->apply_window_int16 = ff_apply_window_int16_ssse3;
249  }
250  }
251 
252 #if HAVE_SSE_INLINE && HAVE_7REGS
253  if (INLINE_SSE(cpu_flags)) {
254  c->downmix = ac3_downmix_sse;
255  }
256 #endif
257 }
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