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1 | /* |
2 | * copyright (c) 2008 Michael Niedermayer <michaelni@gmx.at> | |
3 | * | |
4 | * This file is part of FFmpeg. | |
5 | * | |
6 | * FFmpeg is free software; you can redistribute it and/or | |
7 | * modify it under the terms of the GNU Lesser General Public | |
8 | * License as published by the Free Software Foundation; either | |
9 | * version 2.1 of the License, or (at your option) any later version. | |
10 | * | |
11 | * FFmpeg is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
14 | * Lesser General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU Lesser General Public | |
17 | * License along with FFmpeg; if not, write to the Free Software | |
18 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
19 | */ | |
20 | ||
21 | #include "fft.h" | |
22 | #include "synth_filter.h" | |
23 | ||
24 | static void synth_filter_float(FFTContext *imdct, | |
25 | float *synth_buf_ptr, int *synth_buf_offset, | |
26 | float synth_buf2[32], const float window[512], | |
27 | float out[32], const float in[32], float scale) | |
28 | { | |
29 | float *synth_buf= synth_buf_ptr + *synth_buf_offset; | |
30 | int i, j; | |
31 | ||
32 | imdct->imdct_half(imdct, synth_buf, in); | |
33 | ||
34 | for (i = 0; i < 16; i++){ | |
35 | float a= synth_buf2[i ]; | |
36 | float b= synth_buf2[i + 16]; | |
37 | float c= 0; | |
38 | float d= 0; | |
39 | for (j = 0; j < 512 - *synth_buf_offset; j += 64){ | |
40 | a += window[i + j ]*(-synth_buf[15 - i + j ]); | |
41 | b += window[i + j + 16]*( synth_buf[ i + j ]); | |
42 | c += window[i + j + 32]*( synth_buf[16 + i + j ]); | |
43 | d += window[i + j + 48]*( synth_buf[31 - i + j ]); | |
44 | } | |
45 | for ( ; j < 512; j += 64){ | |
46 | a += window[i + j ]*(-synth_buf[15 - i + j - 512]); | |
47 | b += window[i + j + 16]*( synth_buf[ i + j - 512]); | |
48 | c += window[i + j + 32]*( synth_buf[16 + i + j - 512]); | |
49 | d += window[i + j + 48]*( synth_buf[31 - i + j - 512]); | |
50 | } | |
51 | out[i ] = a*scale; | |
52 | out[i + 16] = b*scale; | |
53 | synth_buf2[i ] = c; | |
54 | synth_buf2[i + 16] = d; | |
55 | } | |
56 | *synth_buf_offset= (*synth_buf_offset - 32)&511; | |
57 | } | |
58 | ||
59 | av_cold void ff_synth_filter_init(SynthFilterContext *c) | |
60 | { | |
61 | c->synth_filter_float = synth_filter_float; | |
62 | ||
63 | if (ARCH_ARM) ff_synth_filter_init_arm(c); | |
64 | if (ARCH_X86) ff_synth_filter_init_x86(c); | |
65 | } |