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Implemented dynamic low-pass filter for SB16/AWE32 DSP playback.

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This commit is contained in:
SarahW 2018-02-12 12:00:32 +00:00
commit 75ec50cfd7
3 changed files with 77 additions and 7 deletions
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11
src/sound_sb.c
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@ -261,9 +261,8 @@ static void sb_get_buffer_sb16(int32_t *buffer, int len, void *p)
in_l = (mixer->input_selector_left&INPUT_MIDI_L) ? out_l : 0 + (mixer->input_selector_left&INPUT_MIDI_R) ? out_r : 0;
in_r = (mixer->input_selector_right&INPUT_MIDI_L) ? out_l : 0 + (mixer->input_selector_right&INPUT_MIDI_R) ? out_r : 0;
/*TODO: CT1745 features dynamic filtering. https://www.vogons.org/viewtopic.php?f=62&t=51514 */
out_l += ((int32_t)(sb->dsp.buffer[c] * mixer->voice_l) / 3) >> 15;
out_r += ((int32_t)(sb->dsp.buffer[c + 1] * mixer->voice_r) / 3) >> 15;
out_l += ((int32_t)(low_fir_sb16(0, (float)sb->dsp.buffer[c]) * mixer->voice_l) / 3) >> 15;
out_r += ((int32_t)(low_fir_sb16(1, (float)sb->dsp.buffer[c + 1]) * mixer->voice_r) / 3) >> 15;
out_l = (out_l * mixer->master_l) >> 15;
out_r = (out_r * mixer->master_r) >> 15;
@ -341,10 +340,8 @@ static void sb_get_buffer_emu8k(int32_t *buffer, int len, void *p)
in_l = (mixer->input_selector_left&INPUT_MIDI_L) ? out_l : 0 + (mixer->input_selector_left&INPUT_MIDI_R) ? out_r : 0;
in_r = (mixer->input_selector_right&INPUT_MIDI_L) ? out_l : 0 + (mixer->input_selector_right&INPUT_MIDI_R) ? out_r : 0;
/*TODO: CT1745 features dynamic filtering. https://www.vogons.org/viewtopic.php?f=62&t=51514 */
out_l += ((int32_t)(sb->dsp.buffer[c] * mixer->voice_l) / 3) >> 15;
out_r += ((int32_t)(sb->dsp.buffer[c + 1] * mixer->voice_r) / 3) >> 15;
out_l += ((int32_t)(low_fir_sb16(0, (float)sb->dsp.buffer[c]) * mixer->voice_l) / 3) >> 15;
out_r += ((int32_t)(low_fir_sb16(1, (float)sb->dsp.buffer[c + 1]) * mixer->voice_r) / 3) >> 15;
out_l = (out_l * mixer->master_l) >> 15;
out_r = (out_r * mixer->master_r) >> 15;