ac3dsp_mips.c
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1 /*
2  * Copyright (c) 2012
3  * MIPS Technologies, Inc., California.
4  *
5  * Redistribution and use in source and binary forms, with or without
6  * modification, are permitted provided that the following conditions
7  * are met:
8  * 1. Redistributions of source code must retain the above copyright
9  * notice, this list of conditions and the following disclaimer.
10  * 2. Redistributions in binary form must reproduce the above copyright
11  * notice, this list of conditions and the following disclaimer in the
12  * documentation and/or other materials provided with the distribution.
13  * 3. Neither the name of the MIPS Technologies, Inc., nor the names of its
14  * contributors may be used to endorse or promote products derived from
15  * this software without specific prior written permission.
16  *
17  * THIS SOFTWARE IS PROVIDED BY THE MIPS TECHNOLOGIES, INC. ``AS IS'' AND
18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20  * ARE DISCLAIMED. IN NO EVENT SHALL THE MIPS TECHNOLOGIES, INC. BE LIABLE
21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27  * SUCH DAMAGE.
28  *
29  * Authors: Branimir Vasic (bvasic@mips.com)
30  * Nedeljko Babic (nbabic@mips.com)
31  *
32  * Various AC-3 DSP Utils optimized for MIPS
33  *
34  * This file is part of FFmpeg.
35  *
36  * FFmpeg is free software; you can redistribute it and/or
37  * modify it under the terms of the GNU Lesser General Public
38  * License as published by the Free Software Foundation; either
39  * version 2.1 of the License, or (at your option) any later version.
40  *
41  * FFmpeg is distributed in the hope that it will be useful,
42  * but WITHOUT ANY WARRANTY; without even the implied warranty of
43  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
44  * Lesser General Public License for more details.
45  *
46  * You should have received a copy of the GNU Lesser General Public
47  * License along with FFmpeg; if not, write to the Free Software
48  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
49  */
50 
51 /**
52  * @file
53  * Reference: libavcodec/ac3dsp.c
54  */
55 
56 #include "config.h"
57 #include "libavcodec/ac3dsp.h"
58 #include "libavcodec/ac3.h"
59 
60 
61 #if HAVE_INLINE_ASM
62 #if HAVE_MIPSDSPR1
63 static void ac3_bit_alloc_calc_bap_mips(int16_t *mask, int16_t *psd,
64  int start, int end,
65  int snr_offset, int floor,
66  const uint8_t *bap_tab, uint8_t *bap)
67 {
68  int band, band_end, cond;
69  int m, address1, address2;
70  int16_t *psd1, *psd_end;
71  uint8_t *bap1;
72 
73  if (snr_offset == -960) {
74  memset(bap, 0, AC3_MAX_COEFS);
75  return;
76  }
77 
78  psd1 = &psd[start];
79  bap1 = &bap[start];
80  band = ff_ac3_bin_to_band_tab[start];
81 
82  do {
83  m = (FFMAX(mask[band] - snr_offset - floor, 0) & 0x1FE0) + floor;
84  band_end = ff_ac3_band_start_tab[++band];
85  band_end = FFMIN(band_end, end);
86  psd_end = psd + band_end - 1;
87 
88  __asm__ volatile (
89  "slt %[cond], %[psd1], %[psd_end] \n\t"
90  "beqz %[cond], 1f \n\t"
91  "2: \n\t"
92  "lh %[address1], 0(%[psd1]) \n\t"
93  "lh %[address2], 2(%[psd1]) \n\t"
94  "addiu %[psd1], %[psd1], 4 \n\t"
95  "subu %[address1], %[address1], %[m] \n\t"
96  "sra %[address1], %[address1], 5 \n\t"
97  "addiu %[address1], %[address1], -32 \n\t"
98  "shll_s.w %[address1], %[address1], 26 \n\t"
99  "subu %[address2], %[address2], %[m] \n\t"
100  "sra %[address2], %[address2], 5 \n\t"
101  "sra %[address1], %[address1], 26 \n\t"
102  "addiu %[address1], %[address1], 32 \n\t"
103  "lbux %[address1], %[address1](%[bap_tab]) \n\t"
104  "addiu %[address2], %[address2], -32 \n\t"
105  "shll_s.w %[address2], %[address2], 26 \n\t"
106  "sb %[address1], 0(%[bap1]) \n\t"
107  "slt %[cond], %[psd1], %[psd_end] \n\t"
108  "sra %[address2], %[address2], 26 \n\t"
109  "addiu %[address2], %[address2], 32 \n\t"
110  "lbux %[address2], %[address2](%[bap_tab]) \n\t"
111  "sb %[address2], 1(%[bap1]) \n\t"
112  "addiu %[bap1], %[bap1], 2 \n\t"
113  "bnez %[cond], 2b \n\t"
114  "addiu %[psd_end], %[psd_end], 2 \n\t"
115  "slt %[cond], %[psd1], %[psd_end] \n\t"
116  "beqz %[cond], 3f \n\t"
117  "1: \n\t"
118  "lh %[address1], 0(%[psd1]) \n\t"
119  "addiu %[psd1], %[psd1], 2 \n\t"
120  "subu %[address1], %[address1], %[m] \n\t"
121  "sra %[address1], %[address1], 5 \n\t"
122  "addiu %[address1], %[address1], -32 \n\t"
123  "shll_s.w %[address1], %[address1], 26 \n\t"
124  "sra %[address1], %[address1], 26 \n\t"
125  "addiu %[address1], %[address1], 32 \n\t"
126  "lbux %[address1], %[address1](%[bap_tab]) \n\t"
127  "sb %[address1], 0(%[bap1]) \n\t"
128  "addiu %[bap1], %[bap1], 1 \n\t"
129  "3: \n\t"
130 
131  : [address1]"=&r"(address1), [address2]"=&r"(address2),
132  [cond]"=&r"(cond), [bap1]"+r"(bap1),
133  [psd1]"+r"(psd1), [psd_end]"+r"(psd_end)
134  : [m]"r"(m), [bap_tab]"r"(bap_tab)
135  : "memory"
136  );
137  } while (end > band_end);
138 }
139 
140 static void ac3_update_bap_counts_mips(uint16_t mant_cnt[16], uint8_t *bap,
141  int len)
142 {
143  int temp0, temp1, temp2, temp3, temp4, temp5, temp6, temp7;
144 
145  __asm__ volatile (
146  "andi %[temp3], %[len], 3 \n\t"
147  "addu %[temp2], %[bap], %[len] \n\t"
148  "addu %[temp4], %[bap], %[temp3] \n\t"
149  "beq %[temp2], %[temp4], 4f \n\t"
150  "1: \n\t"
151  "lbu %[temp0], -1(%[temp2]) \n\t"
152  "lbu %[temp5], -2(%[temp2]) \n\t"
153  "lbu %[temp6], -3(%[temp2]) \n\t"
154  "sll %[temp0], %[temp0], 1 \n\t"
155  "addu %[temp0], %[mant_cnt], %[temp0] \n\t"
156  "sll %[temp5], %[temp5], 1 \n\t"
157  "addu %[temp5], %[mant_cnt], %[temp5] \n\t"
158  "lhu %[temp1], 0(%[temp0]) \n\t"
159  "sll %[temp6], %[temp6], 1 \n\t"
160  "addu %[temp6], %[mant_cnt], %[temp6] \n\t"
161  "addiu %[temp1], %[temp1], 1 \n\t"
162  "sh %[temp1], 0(%[temp0]) \n\t"
163  "lhu %[temp1], 0(%[temp5]) \n\t"
164  "lbu %[temp7], -4(%[temp2]) \n\t"
165  "addiu %[temp2], %[temp2], -4 \n\t"
166  "addiu %[temp1], %[temp1], 1 \n\t"
167  "sh %[temp1], 0(%[temp5]) \n\t"
168  "lhu %[temp1], 0(%[temp6]) \n\t"
169  "sll %[temp7], %[temp7], 1 \n\t"
170  "addu %[temp7], %[mant_cnt], %[temp7] \n\t"
171  "addiu %[temp1], %[temp1],1 \n\t"
172  "sh %[temp1], 0(%[temp6]) \n\t"
173  "lhu %[temp1], 0(%[temp7]) \n\t"
174  "addiu %[temp1], %[temp1], 1 \n\t"
175  "sh %[temp1], 0(%[temp7]) \n\t"
176  "bne %[temp2], %[temp4], 1b \n\t"
177  "4: \n\t"
178  "beqz %[temp3], 2f \n\t"
179  "3: \n\t"
180  "addiu %[temp3], %[temp3], -1 \n\t"
181  "lbu %[temp0], -1(%[temp2]) \n\t"
182  "addiu %[temp2], %[temp2], -1 \n\t"
183  "sll %[temp0], %[temp0], 1 \n\t"
184  "addu %[temp0], %[mant_cnt], %[temp0] \n\t"
185  "lhu %[temp1], 0(%[temp0]) \n\t"
186  "addiu %[temp1], %[temp1], 1 \n\t"
187  "sh %[temp1], 0(%[temp0]) \n\t"
188  "bgtz %[temp3], 3b \n\t"
189  "2: \n\t"
190 
191  : [temp0] "=&r" (temp0), [temp1] "=&r" (temp1),
192  [temp2] "=&r" (temp2), [temp3] "=&r" (temp3),
193  [temp4] "=&r" (temp4), [temp5] "=&r" (temp5),
194  [temp6] "=&r" (temp6), [temp7] "=&r" (temp7)
195  : [len] "r" (len), [bap] "r" (bap),
196  [mant_cnt] "r" (mant_cnt)
197  : "memory"
198  );
199 }
200 #endif
201 
202 #if HAVE_MIPSFPU && HAVE_MIPS32R2
203 static void float_to_fixed24_mips(int32_t *dst, const float *src, unsigned int len)
204 {
205  const float scale = 1 << 24;
206  float src0, src1, src2, src3, src4, src5, src6, src7;
207  int temp0, temp1, temp2, temp3, temp4, temp5, temp6, temp7;
208 
209  do {
210  __asm__ volatile (
211  "lwc1 %[src0], 0(%[src]) \n\t"
212  "lwc1 %[src1], 4(%[src]) \n\t"
213  "lwc1 %[src2], 8(%[src]) \n\t"
214  "lwc1 %[src3], 12(%[src]) \n\t"
215  "lwc1 %[src4], 16(%[src]) \n\t"
216  "lwc1 %[src5], 20(%[src]) \n\t"
217  "lwc1 %[src6], 24(%[src]) \n\t"
218  "lwc1 %[src7], 28(%[src]) \n\t"
219  "mul.s %[src0], %[src0], %[scale] \n\t"
220  "mul.s %[src1], %[src1], %[scale] \n\t"
221  "mul.s %[src2], %[src2], %[scale] \n\t"
222  "mul.s %[src3], %[src3], %[scale] \n\t"
223  "mul.s %[src4], %[src4], %[scale] \n\t"
224  "mul.s %[src5], %[src5], %[scale] \n\t"
225  "mul.s %[src6], %[src6], %[scale] \n\t"
226  "mul.s %[src7], %[src7], %[scale] \n\t"
227  "cvt.w.s %[src0], %[src0] \n\t"
228  "cvt.w.s %[src1], %[src1] \n\t"
229  "cvt.w.s %[src2], %[src2] \n\t"
230  "cvt.w.s %[src3], %[src3] \n\t"
231  "cvt.w.s %[src4], %[src4] \n\t"
232  "cvt.w.s %[src5], %[src5] \n\t"
233  "cvt.w.s %[src6], %[src6] \n\t"
234  "cvt.w.s %[src7], %[src7] \n\t"
235  "mfc1 %[temp0], %[src0] \n\t"
236  "mfc1 %[temp1], %[src1] \n\t"
237  "mfc1 %[temp2], %[src2] \n\t"
238  "mfc1 %[temp3], %[src3] \n\t"
239  "mfc1 %[temp4], %[src4] \n\t"
240  "mfc1 %[temp5], %[src5] \n\t"
241  "mfc1 %[temp6], %[src6] \n\t"
242  "mfc1 %[temp7], %[src7] \n\t"
243  "sw %[temp0], 0(%[dst]) \n\t"
244  "sw %[temp1], 4(%[dst]) \n\t"
245  "sw %[temp2], 8(%[dst]) \n\t"
246  "sw %[temp3], 12(%[dst]) \n\t"
247  "sw %[temp4], 16(%[dst]) \n\t"
248  "sw %[temp5], 20(%[dst]) \n\t"
249  "sw %[temp6], 24(%[dst]) \n\t"
250  "sw %[temp7], 28(%[dst]) \n\t"
251 
252  : [dst] "+r" (dst), [src] "+r" (src),
253  [src0] "=&f" (src0), [src1] "=&f" (src1),
254  [src2] "=&f" (src2), [src3] "=&f" (src3),
255  [src4] "=&f" (src4), [src5] "=&f" (src5),
256  [src6] "=&f" (src6), [src7] "=&f" (src7),
257  [temp0] "=r" (temp0), [temp1] "=r" (temp1),
258  [temp2] "=r" (temp2), [temp3] "=r" (temp3),
259  [temp4] "=r" (temp4), [temp5] "=r" (temp5),
260  [temp6] "=r" (temp6), [temp7] "=r" (temp7)
261  : [scale] "f" (scale)
262  : "memory"
263  );
264  src = src + 8;
265  dst = dst + 8;
266  len -= 8;
267  } while (len > 0);
268 }
269 
270 static void ac3_downmix_mips(float **samples, float (*matrix)[2],
271  int out_ch, int in_ch, int len)
272 {
273  int i, j, i1, i2, i3;
274  float v0, v1, v2, v3;
275  float v4, v5, v6, v7;
276  float samples0, samples1, samples2, samples3, matrix_j, matrix_j2;
277  float *samples_p,*matrix_p, **samples_x, **samples_end, **samples_sw;
278 
279  __asm__ volatile(
280  ".set push \n\t"
281  ".set noreorder \n\t"
282 
283  "li %[i1], 2 \n\t"
284  "sll %[len], 2 \n\t"
285  "move %[i], $zero \n\t"
286  "sll %[j], %[in_ch], 2 \n\t"
287 
288  "bne %[out_ch], %[i1], 3f \n\t" // if (out_ch == 2)
289  " li %[i2], 1 \n\t"
290 
291  "2: \n\t" // start of the for loop (for (i = 0; i < len; i+=4))
292  "move %[matrix_p], %[matrix] \n\t"
293  "move %[samples_x], %[samples] \n\t"
294  "mtc1 $zero, %[v0] \n\t"
295  "mtc1 $zero, %[v1] \n\t"
296  "mtc1 $zero, %[v2] \n\t"
297  "mtc1 $zero, %[v3] \n\t"
298  "mtc1 $zero, %[v4] \n\t"
299  "mtc1 $zero, %[v5] \n\t"
300  "mtc1 $zero, %[v6] \n\t"
301  "mtc1 $zero, %[v7] \n\t"
302  "addiu %[i1], %[i], 4 \n\t"
303  "addiu %[i2], %[i], 8 \n\t"
304  "lw %[samples_p], 0(%[samples_x]) \n\t"
305  "addiu %[i3], %[i], 12 \n\t"
306  "addu %[samples_end], %[samples_x], %[j] \n\t"
307  "move %[samples_sw], %[samples_p] \n\t"
308 
309  "1: \n\t" // start of the inner for loop (for (j = 0; j < in_ch; j++))
310  "lwc1 %[matrix_j], 0(%[matrix_p]) \n\t"
311  "lwc1 %[matrix_j2], 4(%[matrix_p]) \n\t"
312  "lwxc1 %[samples0], %[i](%[samples_p]) \n\t"
313  "lwxc1 %[samples1], %[i1](%[samples_p]) \n\t"
314  "lwxc1 %[samples2], %[i2](%[samples_p]) \n\t"
315  "lwxc1 %[samples3], %[i3](%[samples_p]) \n\t"
316  "addiu %[matrix_p], 8 \n\t"
317  "addiu %[samples_x], 4 \n\t"
318  "madd.s %[v0], %[v0], %[samples0], %[matrix_j] \n\t"
319  "madd.s %[v1], %[v1], %[samples1], %[matrix_j] \n\t"
320  "madd.s %[v2], %[v2], %[samples2], %[matrix_j] \n\t"
321  "madd.s %[v3], %[v3], %[samples3], %[matrix_j] \n\t"
322  "madd.s %[v4], %[v4], %[samples0], %[matrix_j2]\n\t"
323  "madd.s %[v5], %[v5], %[samples1], %[matrix_j2]\n\t"
324  "madd.s %[v6], %[v6], %[samples2], %[matrix_j2]\n\t"
325  "madd.s %[v7], %[v7], %[samples3], %[matrix_j2]\n\t"
326  "bne %[samples_x], %[samples_end], 1b \n\t"
327  " lw %[samples_p], 0(%[samples_x]) \n\t"
328 
329  "lw %[samples_p], 4(%[samples]) \n\t"
330  "swxc1 %[v0], %[i](%[samples_sw]) \n\t"
331  "swxc1 %[v1], %[i1](%[samples_sw]) \n\t"
332  "swxc1 %[v2], %[i2](%[samples_sw]) \n\t"
333  "swxc1 %[v3], %[i3](%[samples_sw]) \n\t"
334  "swxc1 %[v4], %[i](%[samples_p]) \n\t"
335  "addiu %[i], 16 \n\t"
336  "swxc1 %[v5], %[i1](%[samples_p]) \n\t"
337  "swxc1 %[v6], %[i2](%[samples_p]) \n\t"
338  "bne %[i], %[len], 2b \n\t"
339  " swxc1 %[v7], %[i3](%[samples_p]) \n\t"
340 
341  "3: \n\t"
342  "bne %[out_ch], %[i2], 6f \n\t" // if (out_ch == 1)
343  " nop \n\t"
344 
345  "5: \n\t" // start of the outer for loop (for (i = 0; i < len; i+=4))
346  "move %[matrix_p], %[matrix] \n\t"
347  "move %[samples_x], %[samples] \n\t"
348  "mtc1 $zero, %[v0] \n\t"
349  "mtc1 $zero, %[v1] \n\t"
350  "mtc1 $zero, %[v2] \n\t"
351  "mtc1 $zero, %[v3] \n\t"
352  "addiu %[i1], %[i], 4 \n\t"
353  "addiu %[i2], %[i], 8 \n\t"
354  "lw %[samples_p], 0(%[samples_x]) \n\t"
355  "addiu %[i3], %[i], 12 \n\t"
356  "addu %[samples_end], %[samples_x], %[j] \n\t"
357  "move %[samples_sw], %[samples_p] \n\t"
358 
359  "4: \n\t" // start of the inner for loop (for (j = 0; j < in_ch; j++))
360  "lwc1 %[matrix_j], 0(%[matrix_p]) \n\t"
361  "lwxc1 %[samples0], %[i](%[samples_p]) \n\t"
362  "lwxc1 %[samples1], %[i1](%[samples_p]) \n\t"
363  "lwxc1 %[samples2], %[i2](%[samples_p]) \n\t"
364  "lwxc1 %[samples3], %[i3](%[samples_p]) \n\t"
365  "addiu %[matrix_p], 8 \n\t"
366  "addiu %[samples_x], 4 \n\t"
367  "madd.s %[v0], %[v0], %[samples0], %[matrix_j] \n\t"
368  "madd.s %[v1], %[v1], %[samples1], %[matrix_j] \n\t"
369  "madd.s %[v2], %[v2], %[samples2], %[matrix_j] \n\t"
370  "madd.s %[v3], %[v3], %[samples3], %[matrix_j] \n\t"
371  "bne %[samples_x], %[samples_end], 4b \n\t"
372  " lw %[samples_p], 0(%[samples_x]) \n\t"
373 
374  "swxc1 %[v0], %[i](%[samples_sw]) \n\t"
375  "addiu %[i], 16 \n\t"
376  "swxc1 %[v1], %[i1](%[samples_sw]) \n\t"
377  "swxc1 %[v2], %[i2](%[samples_sw]) \n\t"
378  "bne %[i], %[len], 5b \n\t"
379  " swxc1 %[v3], %[i3](%[samples_sw]) \n\t"
380  "6: \n\t"
381 
382  ".set pop"
383  :[samples_p]"=&r"(samples_p), [matrix_j]"=&f"(matrix_j), [matrix_j2]"=&f"(matrix_j2),
384  [samples0]"=&f"(samples0), [samples1]"=&f"(samples1),
385  [samples2]"=&f"(samples2), [samples3]"=&f"(samples3),
386  [v0]"=&f"(v0), [v1]"=&f"(v1), [v2]"=&f"(v2), [v3]"=&f"(v3),
387  [v4]"=&f"(v4), [v5]"=&f"(v5), [v6]"=&f"(v6), [v7]"=&f"(v7),
388  [samples_x]"=&r"(samples_x), [matrix_p]"=&r"(matrix_p),
389  [samples_end]"=&r"(samples_end), [samples_sw]"=&r"(samples_sw),
390  [i1]"=&r"(i1), [i2]"=&r"(i2), [i3]"=&r"(i3), [i]"=&r"(i),
391  [j]"=&r"(j), [len]"+r"(len)
392  :[samples]"r"(samples), [matrix]"r"(matrix),
393  [in_ch]"r"(in_ch), [out_ch]"r"(out_ch)
394  :"memory"
395  );
396 }
397 #endif
398 #endif /* HAVE_INLINE_ASM */
399 
400 void ff_ac3dsp_init_mips(AC3DSPContext *c, int bit_exact) {
401 #if HAVE_INLINE_ASM
402 #if HAVE_MIPSDSPR1
403  c->bit_alloc_calc_bap = ac3_bit_alloc_calc_bap_mips;
404  c->update_bap_counts = ac3_update_bap_counts_mips;
405 #endif
406 #if HAVE_MIPSFPU && HAVE_MIPS32R2
407  c->float_to_fixed24 = float_to_fixed24_mips;
408  c->downmix = ac3_downmix_mips;
409 #endif
410 #endif
411 
412 }
start
Definition: start.py:1
ff_ac3_bin_to_band_tab
uint8_t ff_ac3_bin_to_band_tab[253]
Definition: ac3.c:73
AC3DSPContext::update_bap_counts
void(* update_bap_counts)(uint16_t mant_cnt[16], uint8_t *bap, int len)
Update bap counts using the supplied array of bap.
Definition: ac3dsp.h:117
AC3_MAX_COEFS
#define AC3_MAX_COEFS
Definition: ac3.h:34
band
Definition: af_biquads.c:76
uint8_t
uint8_t
Definition: audio_convert.c:194
m
window constants for m
Definition: extra/genbh92lobe.m:9
end
end end
Definition: extra/f0detection.m:15
AC3DSPContext::bit_alloc_calc_bap
void(* bit_alloc_calc_bap)(int16_t *mask, int16_t *psd, int start, int end, int snr_offset, int floor, const uint8_t *bap_tab, uint8_t *bap)
Calculate bit allocation pointers.
Definition: ac3dsp.h:106
mask
static const uint16_t mask[17]
Definition: lzw.c:37
ff_ac3_band_start_tab
const uint8_t ff_ac3_band_start_tab[AC3_CRITICAL_BANDS+1]
Starting frequency coefficient bin for each critical band.
Definition: ac3.c:34
FFMAX
#define FFMAX(a, b)
Definition: common.h:56
FFMIN
#define FFMIN(a, b)
Definition: common.h:58
int32_t
int32_t
Definition: audio_convert.c:194
src
AVS_Value src
Definition: avisynth_c.h:523
AC3DSPContext::downmix
void(* downmix)(float **samples, float(*matrix)[2], int out_ch, int in_ch, int len)
Definition: ac3dsp.h:135
ff_ac3dsp_init_mips
void ff_ac3dsp_init_mips(AC3DSPContext *c, int bit_exact)
Definition: ac3dsp_mips.c:400
i
synthesis window for stochastic i
Definition: code Kat/hpsmodel.m:34
v0
#define v0
Definition: regdef.h:26
c
static double c[64]
Definition: vsrc_mptestsrc.c:88
scale
Same thing on a dB scale
Definition: FFT of a Simple Sinusoid.m:36
len
int len
Definition: vorbis_enc_data.h:452
dst
else dst[i][x+y *dst_stride[i]]
Definition: vf_mcdeint.c:160
samples
Filter the word “frame” indicates either a video frame or a group of audio samples
Definition: filter_design.txt:2
start
void INT64 start
Definition: avisynth_c.h:594
ac3.h
Common code between the AC-3 encoder and decoder.
AC3DSPContext::float_to_fixed24
void(* float_to_fixed24)(int32_t *dst, const float *src, unsigned int len)
Convert an array of float in range [-1.0,1.0] to int32_t with range [-(1<<24),(1<<24)].
Definition: ac3dsp.h:89
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