cosmetics: Remove unnecessary extern keywords from function declarations
[ffmpeg.git] / libavcodec / x86 / ac3dsp_init.c
1 /*
2  * x86-optimized AC-3 DSP utils
3  * Copyright (c) 2011 Justin Ruggles
4  *
5  * This file is part of Libav.
6  *
7  * Libav 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  * Libav 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 Libav; 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_mmx.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 HAVE_SSE_INLINE && HAVE_7REGS
55
56 #define IF1(x) x
57 #define IF0(x)
58
59 #define MIX5(mono, stereo)                                      \
60     __asm__ volatile (                                          \
61         "movss           0(%1), %%xmm5          \n"             \
62         "movss           8(%1), %%xmm6          \n"             \
63         "movss          24(%1), %%xmm7          \n"             \
64         "shufps     $0, %%xmm5, %%xmm5          \n"             \
65         "shufps     $0, %%xmm6, %%xmm6          \n"             \
66         "shufps     $0, %%xmm7, %%xmm7          \n"             \
67         "1:                                     \n"             \
68         "movaps       (%0, %2), %%xmm0          \n"             \
69         "movaps       (%0, %3), %%xmm1          \n"             \
70         "movaps       (%0, %4), %%xmm2          \n"             \
71         "movaps       (%0, %5), %%xmm3          \n"             \
72         "movaps       (%0, %6), %%xmm4          \n"             \
73         "mulps          %%xmm5, %%xmm0          \n"             \
74         "mulps          %%xmm6, %%xmm1          \n"             \
75         "mulps          %%xmm5, %%xmm2          \n"             \
76         "mulps          %%xmm7, %%xmm3          \n"             \
77         "mulps          %%xmm7, %%xmm4          \n"             \
78  stereo("addps          %%xmm1, %%xmm0          \n")            \
79         "addps          %%xmm1, %%xmm2          \n"             \
80         "addps          %%xmm3, %%xmm0          \n"             \
81         "addps          %%xmm4, %%xmm2          \n"             \
82    mono("addps          %%xmm2, %%xmm0          \n")            \
83         "movaps         %%xmm0, (%0, %2)        \n"             \
84  stereo("movaps         %%xmm2, (%0, %3)        \n")            \
85         "add               $16, %0              \n"             \
86         "jl                 1b                  \n"             \
87         : "+&r"(i)                                              \
88         : "r"(matrix),                                          \
89           "r"(samples[0] + len),                                \
90           "r"(samples[1] + len),                                \
91           "r"(samples[2] + len),                                \
92           "r"(samples[3] + len),                                \
93           "r"(samples[4] + len)                                 \
94         : XMM_CLOBBERS("%xmm0", "%xmm1", "%xmm2", "%xmm3",      \
95                       "%xmm4", "%xmm5", "%xmm6", "%xmm7",)      \
96          "memory"                                               \
97     );
98
99 #define MIX_MISC(stereo)                                        \
100     __asm__ volatile (                                          \
101         "mov              %5, %2            \n"                 \
102         "1:                                 \n"                 \
103         "mov -%c7(%6, %2, %c8), %3          \n"                 \
104         "movaps     (%3, %0), %%xmm0        \n"                 \
105  stereo("movaps       %%xmm0, %%xmm1        \n")                \
106         "mulps        %%xmm4, %%xmm0        \n"                 \
107  stereo("mulps        %%xmm5, %%xmm1        \n")                \
108         "2:                                 \n"                 \
109         "mov   (%6, %2, %c8), %1            \n"                 \
110         "movaps     (%1, %0), %%xmm2        \n"                 \
111  stereo("movaps       %%xmm2, %%xmm3        \n")                \
112         "mulps   (%4, %2, 8), %%xmm2        \n"                 \
113  stereo("mulps 16(%4, %2, 8), %%xmm3        \n")                \
114         "addps        %%xmm2, %%xmm0        \n"                 \
115  stereo("addps        %%xmm3, %%xmm1        \n")                \
116         "add              $4, %2            \n"                 \
117         "jl               2b                \n"                 \
118         "mov              %5, %2            \n"                 \
119  stereo("mov   (%6, %2, %c8), %1            \n")                \
120         "movaps       %%xmm0, (%3, %0)      \n"                 \
121  stereo("movaps       %%xmm1, (%1, %0)      \n")                \
122         "add             $16, %0            \n"                 \
123         "jl               1b                \n"                 \
124         : "+&r"(i), "=&r"(j), "=&r"(k), "=&r"(m)                \
125         : "r"(matrix_simd + in_ch),                             \
126           "g"((intptr_t) - 4 * (in_ch - 1)),                    \
127           "r"(samp + in_ch),                                    \
128           "i"(sizeof(float *)), "i"(sizeof(float *)/4)          \
129         : "memory"                                              \
130     );
131
132 static void ac3_downmix_sse(float **samples, float (*matrix)[2],
133                             int out_ch, int in_ch, int len)
134 {
135     int (*matrix_cmp)[2] = (int(*)[2])matrix;
136     intptr_t i, j, k, m;
137
138     i = -len * sizeof(float);
139     if (in_ch == 5 && out_ch == 2 &&
140         !(matrix_cmp[0][1] | matrix_cmp[2][0]   |
141           matrix_cmp[3][1] | matrix_cmp[4][0]   |
142           (matrix_cmp[1][0] ^ matrix_cmp[1][1]) |
143           (matrix_cmp[0][0] ^ matrix_cmp[2][1]))) {
144         MIX5(IF0, IF1);
145     } else if (in_ch == 5 && out_ch == 1 &&
146                matrix_cmp[0][0] == matrix_cmp[2][0] &&
147                matrix_cmp[3][0] == matrix_cmp[4][0]) {
148         MIX5(IF1, IF0);
149     } else {
150         DECLARE_ALIGNED(16, float, matrix_simd)[AC3_MAX_CHANNELS][2][4];
151         float *samp[AC3_MAX_CHANNELS];
152
153         for (j = 0; j < in_ch; j++)
154             samp[j] = samples[j] + len;
155
156         j = 2 * in_ch * sizeof(float);
157         __asm__ volatile (
158             "1:                                 \n"
159             "sub             $8, %0             \n"
160             "movss     (%2, %0), %%xmm4         \n"
161             "movss    4(%2, %0), %%xmm5         \n"
162             "shufps          $0, %%xmm4, %%xmm4 \n"
163             "shufps          $0, %%xmm5, %%xmm5 \n"
164             "movaps      %%xmm4,   (%1, %0, 4)  \n"
165             "movaps      %%xmm5, 16(%1, %0, 4)  \n"
166             "jg              1b                 \n"
167             : "+&r"(j)
168             : "r"(matrix_simd), "r"(matrix)
169             : "memory"
170         );
171         if (out_ch == 2) {
172             MIX_MISC(IF1);
173         } else {
174             MIX_MISC(IF0);
175         }
176     }
177 }
178
179 #endif /* HAVE_SSE_INLINE && HAVE_7REGS */
180
181 av_cold void ff_ac3dsp_init_x86(AC3DSPContext *c, int bit_exact)
182 {
183     int mm_flags = av_get_cpu_flags();
184
185     if (EXTERNAL_MMX(mm_flags)) {
186         c->ac3_exponent_min = ff_ac3_exponent_min_mmx;
187         c->ac3_max_msb_abs_int16 = ff_ac3_max_msb_abs_int16_mmx;
188         c->ac3_lshift_int16 = ff_ac3_lshift_int16_mmx;
189         c->ac3_rshift_int32 = ff_ac3_rshift_int32_mmx;
190     }
191     if (EXTERNAL_AMD3DNOW(mm_flags)) {
192         c->extract_exponents = ff_ac3_extract_exponents_3dnow;
193         if (!bit_exact) {
194             c->float_to_fixed24 = ff_float_to_fixed24_3dnow;
195         }
196     }
197     if (EXTERNAL_MMXEXT(mm_flags)) {
198         c->ac3_exponent_min = ff_ac3_exponent_min_mmxext;
199         c->ac3_max_msb_abs_int16 = ff_ac3_max_msb_abs_int16_mmxext;
200     }
201     if (EXTERNAL_SSE(mm_flags)) {
202         c->float_to_fixed24 = ff_float_to_fixed24_sse;
203     }
204     if (EXTERNAL_SSE2(mm_flags)) {
205         c->ac3_exponent_min = ff_ac3_exponent_min_sse2;
206         c->ac3_max_msb_abs_int16 = ff_ac3_max_msb_abs_int16_sse2;
207         c->float_to_fixed24 = ff_float_to_fixed24_sse2;
208         c->compute_mantissa_size = ff_ac3_compute_mantissa_size_sse2;
209         c->extract_exponents = ff_ac3_extract_exponents_sse2;
210         if (!(mm_flags & AV_CPU_FLAG_SSE2SLOW)) {
211             c->ac3_lshift_int16 = ff_ac3_lshift_int16_sse2;
212             c->ac3_rshift_int32 = ff_ac3_rshift_int32_sse2;
213         }
214     }
215     if (EXTERNAL_SSSE3(mm_flags)) {
216         c->ac3_max_msb_abs_int16 = ff_ac3_max_msb_abs_int16_ssse3;
217         if (!(mm_flags & AV_CPU_FLAG_ATOM)) {
218             c->extract_exponents = ff_ac3_extract_exponents_ssse3;
219         }
220     }
221
222 #if HAVE_SSE_INLINE && HAVE_7REGS
223     if (INLINE_SSE(mm_flags)) {
224         c->downmix = ac3_downmix_sse;
225     }
226 #endif
227 }