Rockbox open source high quality audio player as a Music Player Daemon
mpris
rockbox
mpd
libadwaita
audio
rust
zig
deno
dsp: Optimize fractional multiplication in audio processing
Removed duplicated multiplications
Change-Id: Iafe1030cd96f16664d6b136ebbe429313b6e6448
+9
-6
+9
-6
lib/rbcodec/dsp/pbe.c
+9
-6
lib/rbcodec/dsp/pbe.c
···
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{
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for (int i = 0; i < count; i++)
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{
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+
int32_t fracmul1 = FRACMUL(buf->p32[ch][i], tcoef1);
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+
int32_t fracmul2 = FRACMUL(buf->p32[ch][i], tcoef2);
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/* 160hz - 500hz no delay */
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-
temp_buffer = FRACMUL(buf->p32[ch][i], tcoef1) -
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-
FRACMUL(buf->p32[ch][i], tcoef2);
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+
temp_buffer = fracmul1 -
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+
fracmul2;
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/* delay below 160hz*/
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x = buf->p32[ch][i] -
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-
FRACMUL(buf->p32[ch][i], tcoef1);
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+
fracmul1;
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temp_buffer += dequeue(b0[ch], &b0_r[ch], b0_level);
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enqueue(x, b0[ch], &b0_w[ch], b0_level );
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+
int32_t fracmul3 = FRACMUL(buf->p32[ch][i], tcoef3);
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/* delay 500-1150hz */
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-
x = FRACMUL(buf->p32[ch][i], tcoef2) -
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-
FRACMUL(buf->p32[ch][i], tcoef3);
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+
x = fracmul2 -
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+
fracmul3;
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temp_buffer += dequeue(b2[ch], &b2_r[ch], b2_level);
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enqueue(x, b2[ch], &b2_w[ch], b2_level );
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/* delay anything beyond 1150hz */
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-
x = FRACMUL(buf->p32[ch][i], tcoef3);
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+
x = fracmul3;
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temp_buffer += dequeue(b3[ch], &b3_r[ch], B3_DLY);
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enqueue(x, b3[ch], &b3_w[ch], B3_DLY );
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