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rockbox/apps/plugins/vu_meter.c
Linus Nielsen Feltzing e392a1b6e6 Log scale for the VU meter, patch #897248 by Lee Pilgrim 
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@4323 a1c6a512-1295-4272-9138-f99709370657
2004-03-01 09:52:24 +00:00

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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
*
* Copyright (C) 2003 Lee Pilgrim
*
* All files in this archive are subject to the GNU General Public License.
* See the file COPYING in the source tree root for full license agreement.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
**************************************************************************/
#include "plugin.h"
#ifndef SIMULATOR
#ifdef HAVE_LCD_BITMAP
static struct plugin_api* rb;
/* This table is used to define x positions on a logarithmic (dBfs) scale.
The formula I used to figure these out was log(x+1)*31.89293,
where x was the original x position. */
static unsigned char db_scale[] = {0,9.6,15.2,19.2,22.3,24.8,27,28.8,30.4,31.9,33.2,34.4,35.5,36.6,37.5,38.4,
39.2,40,40.8,41.5,52.2,42.8,43.4,44,44.6,45.1,45.7,46.2,46.6,47.1,47.6,48,
48.4,48.8,49.2,49.6,50,50.4,50.7,51.1,51.4,51.8,52.1,52.4,52.7,53,53.3,53.6,
53.9,54.2,54.5,54.7,55,55.3,55.5,55.8,56};
/* Define's y positions, and makes it look like an arch, like a real needle would. */
static unsigned char y_values[] = {32,31,30,29,28,27,26,25,24,24,23,22,22,21,21,20,19,19,18,18,18,18,18,17,17,17,17,17,
17,17,17,17,17,18,18,18,18,18,19,19,20,21,21,22,22,23,24,24,25,26,27,28,29,30,31,32,
32,31,30,29,28,27,26,25,24,24,23,22,22,21,21,20,19,19,18,18,18,18,18,17,17,17,17,17,
17,17,17,17,17,18,18,18,18,18,19,19,20,21,21,22,22,23,24,24,25,26,27,28,29,30,31,32};
/* Linear mode bitmap icon. */
static unsigned char mode_linear[] = {0xDF,0x10,0xD0,0x00,0xDF,0x00,0xDF,0x02,0xC4,0x08,0xDF,
0x00,0xDF,0x15,0xD1,0x00,0xDE,0x05,0xDE,0x00,0xDF,0x05,
0xDA};
/* Logarithmic (dBfs) mode bitmap icon. */
static unsigned char mode_dbfs[] = {0xC8,0x14,0x14,0x1F,0x00,0xDF,0x15,0x15,0x0A,0xC0,0x1E,
0x05,0x05,0xC0,0x16,0x15,0xD5,0x09,0xC0,0x00,0xF0,0x00,
0xFE};
#define MAX_PEAK 0x7FFF
#define NEEDLE_BOTTOM_Y 54
#define LEFT_NEEDLE_BOTTOM_X 28
int left_needle_top_y;
int left_needle_top_x;
int old_left_needle_top_x = 0;
int left_needle_top_x_no_log;
#define RIGHT_NEEDLE_BOTTOM_X 84
int right_needle_top_y;
int right_needle_top_x;
int old_right_needle_top_x = 56;
int right_needle_top_x_no_log;
bool show_arch = true;
bool use_log_scale = true;
int needle_cover_mode = 1;
/* This draws everthing but the needles, needle covers, and the visible arch. */
void draw_status_bar(void)
{
rb->lcd_setfont(FONT_SYSFIXED);
rb->lcd_clear_display();
rb->lcd_drawline(0, 10, 111, 10);
rb->lcd_putsxy(1, 1, "VU Meter");
if(use_log_scale)
rb->lcd_bitmap(mode_dbfs, 88, 1, 23, 8, true);
else
rb->lcd_bitmap(mode_linear, 88, 1, 23, 8, true);
rb->lcd_putsxy(25, 56, "L");
rb->lcd_putsxy(81, 56, "R");
/* The last line under the needle covers. */
rb->lcd_drawline(0, 54, 111, 54);
rb->lcd_update();
}
enum plugin_status plugin_start(struct plugin_api* api, void* parameter)
{
TEST_PLUGIN_API(api);
(void) parameter;
rb = api;
draw_status_bar();
while (!PLUGIN_OK)
{
left_needle_top_x_no_log =
(rb->mas_codec_readreg(0xC) * 56 / MAX_PEAK);
right_needle_top_x_no_log =
(rb->mas_codec_readreg(0xD) * 56 / MAX_PEAK) + 56;
rb->lcd_clear_display();
if (use_log_scale)
{
left_needle_top_x = db_scale[left_needle_top_x_no_log];
right_needle_top_x = db_scale[right_needle_top_x_no_log-56]+56;
}
else
{
left_needle_top_x = left_needle_top_x_no_log;
right_needle_top_x = right_needle_top_x_no_log;
}
/* Makes a decay on the needle. Todo: Make a user custom decay. */
left_needle_top_x = (left_needle_top_x+old_left_needle_top_x*2)/3;
right_needle_top_x = (right_needle_top_x+old_right_needle_top_x*2)/3;
old_left_needle_top_x = left_needle_top_x;
old_right_needle_top_x = right_needle_top_x;
left_needle_top_y = y_values[left_needle_top_x];
right_needle_top_y = y_values[right_needle_top_x];
/* Draws the needles */
rb->lcd_drawline(LEFT_NEEDLE_BOTTOM_X, NEEDLE_BOTTOM_Y,
left_needle_top_x, left_needle_top_y);
rb->lcd_drawline(RIGHT_NEEDLE_BOTTOM_X, NEEDLE_BOTTOM_Y,
right_needle_top_x, right_needle_top_y);
if(needle_cover_mode == 1) /* Rounded needle cover. */
{
/* Left needle cover, top to bottom */
rb->lcd_drawline(27, 49, 29, 49);
rb->lcd_drawline(25, 50, 31, 50);
rb->lcd_drawline(23, 51, 33, 51);
rb->lcd_drawline(22, 52, 34, 52);
rb->lcd_drawline(22, 53, 34, 53);
/* Right needle cover, top to bottom */
rb->lcd_drawline(83, 49, 85, 49);
rb->lcd_drawline(81, 50, 87, 50);
rb->lcd_drawline(79, 51, 89, 51);
rb->lcd_drawline(78, 52, 90, 52);
rb->lcd_drawline(78, 53, 90, 53);
}
else /* Pyramid needle cover. */
{
/* Left needle cover, top to bottom */
rb->lcd_drawpixel(28, 49);
rb->lcd_drawline(27, 50, 29, 50);
rb->lcd_drawline(26, 51, 30, 51);
rb->lcd_drawline(25, 52, 31, 52);
rb->lcd_drawline(24, 53, 32, 53);
/* Right needle cover, top to bottom */
rb->lcd_drawpixel(84, 49);
rb->lcd_drawline(83, 50, 85, 50);
rb->lcd_drawline(82, 51, 86, 51);
rb->lcd_drawline(81, 52, 87, 52);
rb->lcd_drawline(80, 53, 88, 53);
}
if(show_arch)
{
int i;
for(i=0;i<=112;i++)
rb->lcd_drawpixel(i, (y_values[i])-2 );
}
rb->lcd_update_rect(0,15,112,39);
switch (rb->button_get_w_tmo(1))
{
case BUTTON_OFF:
return PLUGIN_OK;
break;
case BUTTON_ON:
rb->lcd_clear_display();
rb->lcd_putsxy(1, 1, "Information:");
rb->lcd_putsxy(2, 15, "OFF: Exit");
rb->lcd_putsxy(2, 25, "ON: This Info");
rb->lcd_putsxy(2, 35, "PLAY: Change Scale");
rb->lcd_putsxy(2, 45, "F1: Needle Covers");
rb->lcd_putsxy(2, 55, "F2: Visible Arch");
rb->lcd_update();
rb->sleep(HZ*3);
draw_status_bar();
break;
case BUTTON_PLAY:
use_log_scale = !use_log_scale;
draw_status_bar();
break;
case BUTTON_F1:
needle_cover_mode==2 ? needle_cover_mode=1 : needle_cover_mode++;
break;
case BUTTON_F2:
show_arch = !show_arch;
break;
case SYS_USB_CONNECTED:
rb->usb_screen();
return PLUGIN_USB_CONNECTED;
break;
}
}
}
#endif /* #ifdef HAVE_LCD_BITMAP */
#endif /* #ifndef SIMULATOR */
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