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ac3dsp_init.c
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1 /*
2  * x86-optimized AC-3 DSP utils
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/mem.h"
23 #include "libavutil/x86/asm.h"
24 #include "libavutil/x86/cpu.h"
25 #include "dsputil_x86.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 #if ARCH_X86_32 && defined(__INTEL_COMPILER)
55 # undef HAVE_7REGS
56 # define HAVE_7REGS 0
57 #endif
58 
59 #if HAVE_SSE_INLINE && HAVE_7REGS
60 
61 #define IF1(x) x
62 #define IF0(x)
63 
64 #define MIX5(mono, stereo) \
65  __asm__ volatile ( \
66  "movss 0(%1), %%xmm5 \n" \
67  "movss 8(%1), %%xmm6 \n" \
68  "movss 24(%1), %%xmm7 \n" \
69  "shufps $0, %%xmm5, %%xmm5 \n" \
70  "shufps $0, %%xmm6, %%xmm6 \n" \
71  "shufps $0, %%xmm7, %%xmm7 \n" \
72  "1: \n" \
73  "movaps (%0, %2), %%xmm0 \n" \
74  "movaps (%0, %3), %%xmm1 \n" \
75  "movaps (%0, %4), %%xmm2 \n" \
76  "movaps (%0, %5), %%xmm3 \n" \
77  "movaps (%0, %6), %%xmm4 \n" \
78  "mulps %%xmm5, %%xmm0 \n" \
79  "mulps %%xmm6, %%xmm1 \n" \
80  "mulps %%xmm5, %%xmm2 \n" \
81  "mulps %%xmm7, %%xmm3 \n" \
82  "mulps %%xmm7, %%xmm4 \n" \
83  stereo("addps %%xmm1, %%xmm0 \n") \
84  "addps %%xmm1, %%xmm2 \n" \
85  "addps %%xmm3, %%xmm0 \n" \
86  "addps %%xmm4, %%xmm2 \n" \
87  mono("addps %%xmm2, %%xmm0 \n") \
88  "movaps %%xmm0, (%0, %2) \n" \
89  stereo("movaps %%xmm2, (%0, %3) \n") \
90  "add $16, %0 \n" \
91  "jl 1b \n" \
92  : "+&r"(i) \
93  : "r"(matrix), \
94  "r"(samples[0] + len), \
95  "r"(samples[1] + len), \
96  "r"(samples[2] + len), \
97  "r"(samples[3] + len), \
98  "r"(samples[4] + len) \
99  : XMM_CLOBBERS("%xmm0", "%xmm1", "%xmm2", "%xmm3", \
100  "%xmm4", "%xmm5", "%xmm6", "%xmm7",) \
101  "memory" \
102  );
103 
104 #define MIX_MISC(stereo) \
105  __asm__ volatile ( \
106  "mov %5, %2 \n" \
107  "1: \n" \
108  "mov -%c7(%6, %2, %c8), %3 \n" \
109  "movaps (%3, %0), %%xmm0 \n" \
110  stereo("movaps %%xmm0, %%xmm1 \n") \
111  "mulps %%xmm4, %%xmm0 \n" \
112  stereo("mulps %%xmm5, %%xmm1 \n") \
113  "2: \n" \
114  "mov (%6, %2, %c8), %1 \n" \
115  "movaps (%1, %0), %%xmm2 \n" \
116  stereo("movaps %%xmm2, %%xmm3 \n") \
117  "mulps (%4, %2, 8), %%xmm2 \n" \
118  stereo("mulps 16(%4, %2, 8), %%xmm3 \n") \
119  "addps %%xmm2, %%xmm0 \n" \
120  stereo("addps %%xmm3, %%xmm1 \n") \
121  "add $4, %2 \n" \
122  "jl 2b \n" \
123  "mov %5, %2 \n" \
124  stereo("mov (%6, %2, %c8), %1 \n") \
125  "movaps %%xmm0, (%3, %0) \n" \
126  stereo("movaps %%xmm1, (%1, %0) \n") \
127  "add $16, %0 \n" \
128  "jl 1b \n" \
129  : "+&r"(i), "=&r"(j), "=&r"(k), "=&r"(m) \
130  : "r"(matrix_simd + in_ch), \
131  "g"((intptr_t) - 4 * (in_ch - 1)), \
132  "r"(samp + in_ch), \
133  "i"(sizeof(float *)), "i"(sizeof(float *)/4) \
134  : "memory" \
135  );
136 
137 static void ac3_downmix_sse(float **samples, float (*matrix)[2],
138  int out_ch, int in_ch, int len)
139 {
140  int (*matrix_cmp)[2] = (int(*)[2])matrix;
141  intptr_t i, j, k, m;
142 
143  i = -len * sizeof(float);
144  if (in_ch == 5 && out_ch == 2 &&
145  !(matrix_cmp[0][1] | matrix_cmp[2][0] |
146  matrix_cmp[3][1] | matrix_cmp[4][0] |
147  (matrix_cmp[1][0] ^ matrix_cmp[1][1]) |
148  (matrix_cmp[0][0] ^ matrix_cmp[2][1]))) {
149  MIX5(IF0, IF1);
150  } else if (in_ch == 5 && out_ch == 1 &&
151  matrix_cmp[0][0] == matrix_cmp[2][0] &&
152  matrix_cmp[3][0] == matrix_cmp[4][0]) {
153  MIX5(IF1, IF0);
154  } else {
155  DECLARE_ALIGNED(16, float, matrix_simd)[AC3_MAX_CHANNELS][2][4];
156  float *samp[AC3_MAX_CHANNELS];
157 
158  for (j = 0; j < in_ch; j++)
159  samp[j] = samples[j] + len;
160 
161  j = 2 * in_ch * sizeof(float);
162  __asm__ volatile (
163  "1: \n"
164  "sub $8, %0 \n"
165  "movss (%2, %0), %%xmm4 \n"
166  "movss 4(%2, %0), %%xmm5 \n"
167  "shufps $0, %%xmm4, %%xmm4 \n"
168  "shufps $0, %%xmm5, %%xmm5 \n"
169  "movaps %%xmm4, (%1, %0, 4) \n"
170  "movaps %%xmm5, 16(%1, %0, 4) \n"
171  "jg 1b \n"
172  : "+&r"(j)
173  : "r"(matrix_simd), "r"(matrix)
174  : "memory"
175  );
176  if (out_ch == 2) {
177  MIX_MISC(IF1);
178  } else {
179  MIX_MISC(IF0);
180  }
181  }
182 }
183 
184 #endif /* HAVE_SSE_INLINE && HAVE_7REGS */
185 
186 av_cold void ff_ac3dsp_init_x86(AC3DSPContext *c, int bit_exact)
187 {
188  int cpu_flags = av_get_cpu_flags();
189 
190  if (EXTERNAL_MMX(cpu_flags)) {
191  c->ac3_exponent_min = ff_ac3_exponent_min_mmx;
192  c->ac3_max_msb_abs_int16 = ff_ac3_max_msb_abs_int16_mmx;
193  c->ac3_lshift_int16 = ff_ac3_lshift_int16_mmx;
194  c->ac3_rshift_int32 = ff_ac3_rshift_int32_mmx;
195  }
196  if (EXTERNAL_AMD3DNOW(cpu_flags)) {
197  if (!bit_exact) {
198  c->float_to_fixed24 = ff_float_to_fixed24_3dnow;
199  }
200  }
201  if (EXTERNAL_MMXEXT(cpu_flags)) {
202  c->ac3_exponent_min = ff_ac3_exponent_min_mmxext;
203  c->ac3_max_msb_abs_int16 = ff_ac3_max_msb_abs_int16_mmxext;
204  }
205  if (EXTERNAL_SSE(cpu_flags)) {
206  c->float_to_fixed24 = ff_float_to_fixed24_sse;
207  }
208  if (EXTERNAL_SSE2(cpu_flags)) {
209  c->ac3_exponent_min = ff_ac3_exponent_min_sse2;
210  c->ac3_max_msb_abs_int16 = ff_ac3_max_msb_abs_int16_sse2;
211  c->float_to_fixed24 = ff_float_to_fixed24_sse2;
212  c->compute_mantissa_size = ff_ac3_compute_mantissa_size_sse2;
213  c->extract_exponents = ff_ac3_extract_exponents_sse2;
214  if (!(cpu_flags & AV_CPU_FLAG_SSE2SLOW)) {
215  c->ac3_lshift_int16 = ff_ac3_lshift_int16_sse2;
216  c->ac3_rshift_int32 = ff_ac3_rshift_int32_sse2;
217  }
218  }
219  if (EXTERNAL_SSSE3(cpu_flags)) {
220  c->ac3_max_msb_abs_int16 = ff_ac3_max_msb_abs_int16_ssse3;
221  if (!(cpu_flags & AV_CPU_FLAG_ATOM)) {
222  c->extract_exponents = ff_ac3_extract_exponents_ssse3;
223  }
224  }
225 
226 #if HAVE_SSE_INLINE && HAVE_7REGS
227  if (INLINE_SSE(cpu_flags)) {
228  c->downmix = ac3_downmix_sse;
229  }
230 #endif
231 }
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