tsiry-sandratraina.com
A modern Music Player Daemon based on Rockbox open source high quality audio player
libadwaita
audio
rust
zig
deno
mpris
rockbox
mpd
1/***************************************************************************
2 * __________ __ ___.
3 * Open \______ \ ____ ____ | | _\_ |__ _______ ___
4 * Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
5 * Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
6 * Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
7 * \/ \/ \/ \/ \/
8 * $Id$
9 *
10 * Copyright (c) 2011 Michael Sevakis
11 *
12 * This program is free software; you can redistribute it and/or
13 * modify it under the terms of the GNU General Public License
14 * as published by the Free Software Foundation; either version 2
15 * of the License, or (at your option) any later version.
16 *
17 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
18 * KIND, either express or implied.
19 *
20 ****************************************************************************/
21#include "config.h"
22#include "system.h"
23#include "settings.h"
24#include "pcm.h"
25#include "pcm_mixer.h"
26#include "misc.h"
27#include "fixedpoint.h"
28
29/** Beep generation, CPU optimized **/
30#include "asm/beep.c"
31
32static uint32_t beep_phase; /* Phase of square wave generator */
33static uint32_t beep_step; /* Step of square wave generator on each sample */
34#ifdef BEEP_GENERIC
35static int16_t beep_amplitude; /* Amplitude of square wave generator */
36#else
37/* Optimized routines do XOR with phase sign bit in both channels at once */
38static uint32_t beep_amplitude; /* Amplitude of square wave generator */
39#endif
40static int beep_count; /* Number of samples remaining to generate */
41
42#define BEEP_COUNT(fs, duration) ((fs) / 1000 * (duration))
43
44/* Reserve enough static space for keyclick to fit in worst case */
45#define BEEP_BUF_COUNT BEEP_COUNT(PLAY_SAMPR_MAX, KEYCLICK_DURATION)
46static int16_t beep_buf[BEEP_BUF_COUNT*2] IBSS_ATTR __attribute__((aligned(4)));
47
48/* Callback to generate the beep frames - also don't want inlining of
49 call below in beep_play */
50static void __attribute__((noinline))
51beep_get_more(const void **start, size_t *size)
52{
53 int count = beep_count;
54
55 if (count > 0)
56 {
57 count = MIN(count, BEEP_BUF_COUNT);
58 beep_count -= count;
59 *start = beep_buf;
60 *size = count * 2 * sizeof (int16_t);
61 beep_generate((void *)beep_buf, count, &beep_phase,
62 beep_step, beep_amplitude);
63 }
64}
65
66/* Generates a constant square wave sound with a given frequency in Hertz for
67 a duration in milliseconds */
68void beep_play(unsigned int frequency, unsigned int duration,
69 unsigned int amplitude)
70{
71 mixer_channel_stop(PCM_MIXER_CHAN_BEEP);
72
73 if (frequency == 0 || duration == 0 || amplitude == 0)
74 return;
75
76 if (amplitude > INT16_MAX)
77 amplitude = INT16_MAX;
78
79 /* Setup the parameters for the square wave generator */
80 uint32_t fout = mixer_get_frequency();
81 beep_phase = 0;
82 beep_step = fp_div(frequency, fout, 32);
83 beep_count = BEEP_COUNT(fout, duration);
84
85#ifdef BEEP_GENERIC
86 beep_amplitude = amplitude;
87#else
88 /* Optimized routines do XOR with phase sign bit in both channels at once */
89 beep_amplitude = amplitude | (amplitude << 16); /* Word:|AMP16|AMP16| */
90#endif
91
92 /* If it fits - avoid cb overhead */
93 const void *start;
94 size_t size;
95
96 /* Generate first frame here */
97 beep_get_more(&start, &size);
98
99 mixer_channel_set_amplitude(PCM_MIXER_CHAN_BEEP, MIX_AMP_UNITY);
100 mixer_channel_play_data(PCM_MIXER_CHAN_BEEP,
101 beep_count ? beep_get_more : NULL,
102 start, size);
103}