0,0 → 1,65 |
/* |
* copyright (c) 2008 Michael Niedermayer <michaelni@gmx.at> |
* |
* This file is part of FFmpeg. |
* |
* FFmpeg is free software; you can redistribute it and/or |
* modify it under the terms of the GNU Lesser General Public |
* License as published by the Free Software Foundation; either |
* version 2.1 of the License, or (at your option) any later version. |
* |
* FFmpeg is distributed in the hope that it will be useful, |
* but WITHOUT ANY WARRANTY; without even the implied warranty of |
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
* Lesser General Public License for more details. |
* |
* You should have received a copy of the GNU Lesser General Public |
* License along with FFmpeg; if not, write to the Free Software |
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
*/ |
|
#include "fft.h" |
#include "synth_filter.h" |
|
static void synth_filter_float(FFTContext *imdct, |
float *synth_buf_ptr, int *synth_buf_offset, |
float synth_buf2[32], const float window[512], |
float out[32], const float in[32], float scale) |
{ |
float *synth_buf= synth_buf_ptr + *synth_buf_offset; |
int i, j; |
|
imdct->imdct_half(imdct, synth_buf, in); |
|
for (i = 0; i < 16; i++){ |
float a= synth_buf2[i ]; |
float b= synth_buf2[i + 16]; |
float c= 0; |
float d= 0; |
for (j = 0; j < 512 - *synth_buf_offset; j += 64){ |
a += window[i + j ]*(-synth_buf[15 - i + j ]); |
b += window[i + j + 16]*( synth_buf[ i + j ]); |
c += window[i + j + 32]*( synth_buf[16 + i + j ]); |
d += window[i + j + 48]*( synth_buf[31 - i + j ]); |
} |
for ( ; j < 512; j += 64){ |
a += window[i + j ]*(-synth_buf[15 - i + j - 512]); |
b += window[i + j + 16]*( synth_buf[ i + j - 512]); |
c += window[i + j + 32]*( synth_buf[16 + i + j - 512]); |
d += window[i + j + 48]*( synth_buf[31 - i + j - 512]); |
} |
out[i ] = a*scale; |
out[i + 16] = b*scale; |
synth_buf2[i ] = c; |
synth_buf2[i + 16] = d; |
} |
*synth_buf_offset= (*synth_buf_offset - 32)&511; |
} |
|
av_cold void ff_synth_filter_init(SynthFilterContext *c) |
{ |
c->synth_filter_float = synth_filter_float; |
|
if (ARCH_ARM) ff_synth_filter_init_arm(c); |
if (ARCH_X86) ff_synth_filter_init_x86(c); |
} |