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@ -22,38 +22,39 @@ |
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#include "synth_filter.h" |
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static void synth_filter_float(FFTContext *imdct, |
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float *synth_buf_ptr, int *synth_buf_offset, |
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float synth_buf2[32], const float window[512], |
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float out[32], const float in[32], float scale) |
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float *synth_buf_ptr, int *synth_buf_offset, |
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float synth_buf2[32], const float window[512], |
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float out[32], const float in[32], float scale) |
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{ |
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float *synth_buf= synth_buf_ptr + *synth_buf_offset; |
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float *synth_buf = synth_buf_ptr + *synth_buf_offset; |
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int i, j; |
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imdct->imdct_half(imdct, synth_buf, in); |
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for (i = 0; i < 16; i++){ |
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float a= synth_buf2[i ]; |
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float b= synth_buf2[i + 16]; |
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float c= 0; |
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float d= 0; |
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for (j = 0; j < 512 - *synth_buf_offset; j += 64){ |
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a += window[i + j ]*(-synth_buf[15 - i + j ]); |
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b += window[i + j + 16]*( synth_buf[ i + j ]); |
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c += window[i + j + 32]*( synth_buf[16 + i + j ]); |
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d += window[i + j + 48]*( synth_buf[31 - i + j ]); |
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for (i = 0; i < 16; i++) { |
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float a = synth_buf2[i ]; |
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float b = synth_buf2[i + 16]; |
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float c = 0; |
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float d = 0; |
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for (j = 0; j < 512 - *synth_buf_offset; j += 64) { |
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a += window[i + j ] * (-synth_buf[15 - i + j ]); |
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b += window[i + j + 16] * ( synth_buf[ i + j ]); |
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c += window[i + j + 32] * ( synth_buf[16 + i + j ]); |
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d += window[i + j + 48] * ( synth_buf[31 - i + j ]); |
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} |
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for ( ; j < 512; j += 64){ |
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a += window[i + j ]*(-synth_buf[15 - i + j - 512]); |
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b += window[i + j + 16]*( synth_buf[ i + j - 512]); |
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c += window[i + j + 32]*( synth_buf[16 + i + j - 512]); |
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d += window[i + j + 48]*( synth_buf[31 - i + j - 512]); |
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for ( ; j < 512; j += 64) { |
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a += window[i + j ] * (-synth_buf[15 - i + j - 512]); |
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b += window[i + j + 16] * ( synth_buf[ i + j - 512]); |
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c += window[i + j + 32] * ( synth_buf[16 + i + j - 512]); |
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d += window[i + j + 48] * ( synth_buf[31 - i + j - 512]); |
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} |
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out[i ] = a*scale; |
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out[i + 16] = b*scale; |
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out[i ] = a * scale; |
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out[i + 16] = b * scale; |
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synth_buf2[i ] = c; |
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synth_buf2[i + 16] = d; |
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} |
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*synth_buf_offset= (*synth_buf_offset - 32)&511; |
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*synth_buf_offset = (*synth_buf_offset - 32) & 511; |
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} |
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av_cold void ff_synth_filter_init(SynthFilterContext *c) |
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