/*************************************************************************** * __________ __ ___. * Open \______ \ ____ ____ | | _\_ |__ _______ ___ * Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ / * Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < < * Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \ * \/ \/ \/ \/ \/ * $Id$ * * Copyright (C) 2014 by Chiwen Chang * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version 2 * of the License, or (at your option) any later version. * * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY * KIND, either express or implied. * ****************************************************************************/ #include "surround.h" #include "config.h" #include "fixedpoint.h" #include "fracmul.h" #include "settings.h" #include "dsp_proc_entry.h" #include "dsp_filter.h" #include "core_alloc.h" static bool surround_enabled = false; static int surround_balance = 0; static bool surround_side_only = false; static int surround_mix = 100; static int surround_strength = 0; /*1 sample ~ 11ns */ #define DLY_5MS 454 #define DLY_8MS 727 #define DLY_10MS 909 #define DLY_15MS 1363 #define DLY_30MS 2727 #define MAX_DLY DLY_30MS #define B0_DLY (MAX_DLY/8 + 1) #define B2_DLY (MAX_DLY + 1) #define BB_DLY (MAX_DLY/4 + 1) #define HH_DLY (MAX_DLY/2 + 1) #define CL_DLY B2_DLY /*only need to buffer right channel */ static int32_t *b0, *b2, *bb, *hh, *cl; static int32_t temp_buffer[2]; static int32_t mid, side; /*voice from 300hz - 3400hz ?*/ static int32_t tcoef1,tcoef2,bcoef,hcoef; static int dly_size = MAX_DLY; static int cutoff_l = 320; static int cutoff_h = 3400; static int b0_r=0,b0_w=0, b2_r=0,b2_w=0, bb_r=0,bb_w=0, hh_r=0,hh_w=0, cl_r=0,cl_w=0; static int handle = -1; static void surround_buffer_alloc(void) { if (handle > 0) return; /* already-allocated */ unsigned int total_len = B0_DLY + B2_DLY + BB_DLY + HH_DLY + CL_DLY; handle = core_alloc("dsp_surround_buffer",sizeof(int32_t) * total_len); if (handle < 0) { surround_enabled = false; return; } memset(core_get_data(handle),0,sizeof(int32_t) * total_len); } static void surround_buffer_get_data(void) { if (handle < 0) return; b0 = core_get_data(handle); b2 = b0 + B0_DLY; bb = b2 + B2_DLY; hh = bb + BB_DLY; cl = hh + HH_DLY; } static void dsp_surround_flush(void) { if (!surround_enabled) return; unsigned int total_len = B0_DLY + B2_DLY + BB_DLY + HH_DLY + CL_DLY; memset(core_get_data(handle),0,sizeof(int32_t) * total_len); } static void surround_update_filter(unsigned int fout) { tcoef1 = fp_div(cutoff_l, fout, 31); tcoef2 = fp_div(cutoff_h, fout, 31); bcoef = fp_div(cutoff_l / 2, fout, 31); hcoef = fp_div(cutoff_h * 2, fout, 31); } void dsp_surround_set_balance(int var) { surround_balance = var; } void dsp_surround_side_only(bool var) { dsp_surround_flush(); surround_side_only = var; } void dsp_surround_mix(int var) { surround_mix = var; } void dsp_surround_set_cutoff(int frq_l, int frq_h) { cutoff_l = frq_l;/*fx2*/ cutoff_h = frq_h;/*fx1*/ struct dsp_config *dsp = dsp_get_config(CODEC_IDX_AUDIO); unsigned int fout = dsp_get_output_frequency(dsp); surround_update_filter(fout); } static void surround_set_stepsize(int surround_strength) { dsp_surround_flush(); switch(surround_strength) { case 1: dly_size = DLY_5MS; break; case 2: dly_size = DLY_8MS; break; case 3: dly_size = DLY_10MS; break; case 4: dly_size = DLY_15MS; break; case 5: dly_size = DLY_30MS; break; } } void dsp_surround_enable(int var) { if (var == surround_strength) return; /* No setting change */ bool was_enabled = surround_strength > 0; surround_strength = var; surround_set_stepsize(surround_strength); bool now_enabled = var > 0; if (was_enabled == now_enabled && !now_enabled) return; /* No change in enabled status */ if (now_enabled == false && handle > 0) { core_free(handle); handle = -1; } surround_enabled = now_enabled; struct dsp_config *dsp = dsp_get_config(CODEC_IDX_AUDIO); dsp_proc_enable(dsp, DSP_PROC_SURROUND, now_enabled); } static void surround_process(struct dsp_proc_entry *this, struct dsp_buffer **buf_p) { struct dsp_buffer *buf = *buf_p; int count = buf->remcount; int dly_shift3 = dly_size/8; int dly_shift2 = dly_size/4; int dly_shift1 = dly_size/2; int dly = dly_size; int i; int32_t x; surround_buffer_get_data(); for (i = 0; i < count; i++) { mid = buf->p32[0][i] /2 + buf->p32[1][i] /2; side = buf->p32[0][i] - buf->p32[1][i]; if (!surround_side_only) { /*clone the left channal*/ temp_buffer[0]= buf->p32[0][i]; /*keep the middle band of right channel*/ temp_buffer[1]= FRACMUL(buf->p32[1][i], tcoef1) - FRACMUL(buf->p32[1][i], tcoef2); } else /* apply haas to side only*/ { temp_buffer[0] = side / 2; temp_buffer[1] = FRACMUL(-side,tcoef1)/2 - FRACMUL(-side, tcoef2)/2; } /* inverted crossfeed delay (left channel) to make sound wider*/ x = temp_buffer[1]/100 * 35; temp_buffer[0] += dequeue(cl, &cl_r, dly); enqueue(-x, cl, &cl_w, dly); /* apply 1/8 delay to frequency below fx2 */ x = buf->p32[1][i] - FRACMUL(buf->p32[1][i], tcoef1); temp_buffer[1] += dequeue(b0, &b0_r, dly_shift3); enqueue(x, b0, &b0_w, dly_shift3 ); /* cut frequency below half fx2*/ temp_buffer[1] = FRACMUL(temp_buffer[1], bcoef); /* apply 1/4 delay to frequency below half fx2 */ /* use different delay to fake the sound direction*/ x = buf->p32[1][i] - FRACMUL(buf->p32[1][i], bcoef); temp_buffer[1] += dequeue(bb, &bb_r, dly_shift2); enqueue(x, bb, &bb_w, dly_shift2 ); /* apply full delay to higher band */ x = FRACMUL(buf->p32[1][i], tcoef2); temp_buffer[1] += dequeue(b2, &b2_r, dly); enqueue(x, b2, &b2_w, dly ); /* do the same direction trick again */ temp_buffer[1] -= FRACMUL(temp_buffer[1], hcoef); x = FRACMUL(buf->p32[1][i], hcoef); temp_buffer[1] += dequeue(hh, &hh_r, dly_shift1); enqueue(x, hh, &hh_w, dly_shift1 ); /*balance*/ if (surround_balance > 0 && !surround_side_only) { temp_buffer[0] -= temp_buffer[0]/200 * surround_balance; temp_buffer[1] += temp_buffer[1]/200 * surround_balance; } else if (surround_balance > 0) { temp_buffer[0] += temp_buffer[0]/200 * surround_balance; temp_buffer[1] -= temp_buffer[1]/200 * surround_balance; } if (surround_side_only) { temp_buffer[0] += mid; temp_buffer[1] += mid; } if (surround_mix == 100) { buf->p32[0][i] = temp_buffer[0]; buf->p32[1][i] = temp_buffer[1]; } else { /*dry wet mix*/ buf->p32[0][i] = buf->p32[0][i]/100 * (100-surround_mix) + temp_buffer[0]/100 * surround_mix; buf->p32[1][i] = buf->p32[1][i]/100 * (100-surround_mix) + temp_buffer[1]/100 * surround_mix; } } (void)this; } /* DSP message hook */ static intptr_t surround_configure(struct dsp_proc_entry *this, struct dsp_config *dsp, unsigned int setting, intptr_t value) { unsigned int fout = dsp_get_output_frequency(dsp); switch (setting) { case DSP_PROC_INIT: if (value == 0) { this->process = surround_process; surround_buffer_alloc(); dsp_surround_flush(); dsp_proc_activate(dsp, DSP_PROC_SURROUND, true); } else surround_update_filter(fout); break; case DSP_FLUSH: dsp_surround_flush(); break; case DSP_SET_OUT_FREQUENCY: surround_update_filter(value); break; case DSP_PROC_CLOSE: break; } return 1; (void)dsp; } /* Database entry */ DSP_PROC_DB_ENTRY( SURROUND, surround_configure);