mirror of
https://github.com/ekeeke/Genesis-Plus-GX.git
synced 2025-01-14 12:19:06 +01:00
+ added 3-Band Audio Equalizer support
This commit is contained in:
ekeeke31
parent
05014756ca
commit
adcd65f2f4
@ -68,9 +68,11 @@ void config_default(void)
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/* sound options */
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config.psg_preamp = 150;
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config.fm_preamp = 100;
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config.boost = 1;
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config.hq_fm = 1;
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config.filter = 1;
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config.lg = 1.0;
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config.mg = 1.0;
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config.hg = 1.0;
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/* system options */
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config.region_detect = 0;
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@ -84,30 +86,34 @@ void config_default(void)
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config.yscale = 0;
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config.aspect = 1;
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config.overscan = 1;
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config.render = VIDEO_HaveComponentCable() ? 2 : 0;
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if (VIDEO_HaveComponentCable())
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config.render = 2;
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else
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config.render = 0;
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config.ntsc = 0;
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config.bilinear = 1;
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/* controllers options */
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input.system[0] = SYSTEM_GAMEPAD;
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input.system[1] = SYSTEM_GAMEPAD;
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gx_input_SetDefault();
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config.gun_cursor[0] = 1;
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config.gun_cursor[1] = 1;
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config.invert_mouse = 0;
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gx_input_SetDefault();
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/* menu options */
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#ifdef HW_RVL
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config.sram_auto = 0; /* let's assume we always have a FAT device by default */
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/* let's assume we always have a FAT device by default */
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config.sram_auto = 0;
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#else
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config.sram_auto = -1;
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#endif
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config.state_auto = -1;
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config.bg_color = 0;
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config.bgm_volume = 100.0;
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config.sfx_volume = 100.0;
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config.screen_w = 658;
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config.ask_confirm = 0;
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config.bgm_volume = 100.0;
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config.sfx_volume = 100.0;
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/* restore saved configuration */
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config_load();
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@ -31,11 +31,13 @@
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typedef struct
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{
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char version[16];
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uint8 hq_fm;
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int32 psg_preamp;
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int32 fm_preamp;
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uint8 boost;
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uint8 filter;
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uint8 hq_fm;
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float lg;
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float mg;
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float hg;
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uint8 region_detect;
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uint8 force_dtack;
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uint8 bios_enabled;
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@ -54,13 +56,13 @@ typedef struct
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uint16 pad_keymap[4][MAX_KEYS];
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uint32 wpad_keymap[4*3][MAX_KEYS];
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t_input_config input[MAX_INPUTS];
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int8 bg_color;
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float bgm_volume;
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float sfx_volume;
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int8 sram_auto;
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int8 state_auto;
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int8 bg_color;
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int16 screen_w;
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uint8 ask_confirm;
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float bgm_volume;
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float sfx_volume;
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} t_config;
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/* Global data */
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@ -217,13 +217,15 @@ static gui_item items_options[5] =
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};
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/* Audio options menu */
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static gui_item items_audio[5] =
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static gui_item items_audio[7] =
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{
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{NULL,NULL,"PSG Volume: 2.50", "Adjust PSG output level", 52,132,276,48},
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{NULL,NULL,"FM Volume: 1.00", "Adjust FM output level", 52,132,276,48},
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{NULL,NULL,"Volume Boost: 1x", "Adjust general output level", 52,132,276,48},
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{NULL,NULL,"LowPass Filter: OFF","Enable/disable sound filtering", 52,132,276,48},
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{NULL,NULL,"HQ YM2612: LINEAR", "Enable/disable FM chip interpolation",52,132,276,48}
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{NULL,NULL,"High-Quality FM: LINEAR", "Setup YM2612 resampling", 52,132,276,48},
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{NULL,NULL,"PSG Volume: 2.50", "Adjust SN76489 output level", 52,132,276,48},
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{NULL,NULL,"FM Volume: 1.00", "Adjust YM2612 output level", 52,132,276,48},
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{NULL,NULL,"Filtering: 3-BAND EQ", "Setup Audio filtering", 52,132,276,48},
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{NULL,NULL,"Low Gain: 1.00", "Adjust EQ Low Gain", 52,132,276,48},
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{NULL,NULL,"Middle Gain: 1.00", "Adjust EQ Middle Gain", 52,132,276,48},
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{NULL,NULL,"High Gain: 1.00", "Adjust EQ High Gain", 52,132,276,48},
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};
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/* System options menu */
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@ -434,7 +436,7 @@ static gui_menu menu_audio =
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{
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"Audio Settings",
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0,0,
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5,4,6,
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7,4,6,
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items_audio,
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buttons_list,
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bg_list,
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@ -696,15 +698,25 @@ static void soundmenu ()
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float psg_volume = (double)config.psg_preamp/100.0;
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float fm_volume = (double)config.fm_preamp/100.0;
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sprintf (items[0].text, "PSG Volume: %1.2f", psg_volume);
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sprintf (items[1].text, "FM Volume: %1.2f", fm_volume);
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sprintf (items[2].text, "Volume Boost: %dX", config.boost);
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sprintf (items[3].text, "LowPass Filter: %s", config.filter ? " ON":"OFF");
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if (config.hq_fm == 0) sprintf (items[4].text, "HQ YM2612: OFF");
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else if (config.hq_fm == 1) sprintf (items[4].text, "HQ YM2612: LINEAR");
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else sprintf (items[4].text, "HQ YM2612: SINC");
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if (config.hq_fm == 0) sprintf (items[0].text, "High-Quality FM: OFF");
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else if (config.hq_fm == 1) sprintf (items[0].text, "High-Quality FM: LINEAR");
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else sprintf (items[0].text, "High-Quality FM: SINC");
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sprintf (items[1].text, "PSG Volume: %1.2f", psg_volume);
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sprintf (items[2].text, "FM Volume: %1.2f", (double)config.fm_preamp/100.0);
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if (config.filter == 2) sprintf (items[3].text, "Filtering: 3-BAND EQ");
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else if (config.filter == 1) sprintf (items[3].text, "Filtering: LOW PASS");
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else sprintf (items[3].text, "Filtering: OFF");
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sprintf (items[4].text, "Low Gain: %1.2f", config.lg);
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sprintf (items[5].text, "Low Gain: %1.2f", config.mg);
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sprintf (items[6].text, "Low Gain: %1.2f", config.hg);
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GUI_InitMenu(m);
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if (config.filter < 2)
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m->max_items = 4;
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else
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m->max_items = 7;
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GUI_SlideMenuTitle(m,strlen("Audio "));
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while (quit == 0)
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@ -714,34 +726,11 @@ static void soundmenu ()
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switch (ret)
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{
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case 0:
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GUI_OptionBox(m,0,"PSG Volume",(void *)&psg_volume,0.01,0.0,5.0,0);
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sprintf (items[0].text, "PSG Volume: %1.2f", psg_volume);
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config.psg_preamp = (int)(psg_volume * 100.0);
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break;
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case 1:
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GUI_OptionBox(m,0,"FM Volume",(void *)&fm_volume,0.01,0.0,5.0,0);
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sprintf (items[1].text, "FM Volume: %1.2f", (double)config.fm_preamp/100.0);
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config.fm_preamp = (int)(fm_volume * 100.0);
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break;
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case 2:
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config.boost ++;
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if (config.boost > 4) config.boost = 0;
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sprintf (items[2].text, "Volume Boost: %dX", config.boost);
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break;
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case 3:
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config.filter ^= 1;
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sprintf (items[3].text, "LowPass Filter: %s", config.filter ? " ON":"OFF");
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break;
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case 4:
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config.hq_fm ++;
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if (config.hq_fm > 2) config.hq_fm = 0;
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if (config.hq_fm == 0) sprintf (items[4].text, "HQ YM2612: OFF");
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else if (config.hq_fm == 1) sprintf (items[4].text, "HQ YM2612: LINEAR");
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else sprintf (items[4].text, "HQ YM2612: SINC");
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if (config.hq_fm == 0) sprintf (items[0].text, "High-Quality FM: OFF");
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else if (config.hq_fm == 1) sprintf (items[0].text, "High-Quality FM: LINEAR");
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else sprintf (items[0].text, "High-Quality FM: SINC");
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if (genromsize)
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{
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unsigned char *temp = memalign(32,YM2612GetContextSize());
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@ -755,12 +744,70 @@ static void soundmenu ()
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}
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break;
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case 1:
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GUI_OptionBox(m,0,"PSG Volume",(void *)&psg_volume,0.01,0.0,5.0,0);
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sprintf (items[1].text, "PSG Volume: %1.2f", psg_volume);
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config.psg_preamp = (int)(psg_volume * 100.0);
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break;
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case 2:
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GUI_OptionBox(m,0,"FM Volume",(void *)&fm_volume,0.01,0.0,5.0,0);
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sprintf (items[2].text, "FM Volume: %1.2f", (double)config.fm_preamp/100.0);
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config.fm_preamp = (int)(fm_volume * 100.0);
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break;
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case 3:
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config.filter ++;
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if (config.filter > 2) config.filter = 0;
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if (config.filter == 2)
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sprintf (items[3].text, "Filtering: 3-BAND EQ");
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else if (config.filter == 1)
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sprintf (items[3].text, "Filtering: LOW PASS");
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else
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sprintf (items[3].text, "Filtering: OFF");
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if (config.filter < 2)
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{
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/* reset menu selection */
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m->offset = 0;
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m->selected = 3;
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m->max_items = 4;
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}
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else
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{
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/* enable items */
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m->max_items = 7;
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/* intialize EQ */
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audio_init_equalizer();
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}
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break;
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case 4:
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GUI_OptionBox(m,0,"Low Gain",(void *)&config.lg,0.01,0.0,2.0,0);
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sprintf (items[4].text, "Low Gain: %1.2f", config.lg);
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audio_set_equalizer();
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break;
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case 5:
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GUI_OptionBox(m,0,"Middle Gain",(void *)&config.mg,0.01,0.0,2.0,0);
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sprintf (items[5].text, "Low Gain: %1.2f", config.mg);
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audio_set_equalizer();
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break;
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case 6:
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GUI_OptionBox(m,0,"High Gain",(void *)&config.hg,0.01,0.0,2.0,0);
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sprintf (items[6].text, "Low Gain: %1.2f", config.hg);
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audio_set_equalizer();
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break;
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case -1:
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quit = 1;
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break;
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}
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}
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m->max_items = 7;
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GUI_DeleteMenu(m);
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}
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@ -881,6 +928,12 @@ static void videomenu ()
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else sprintf (items[5].text, "Aspect: FIT SCREEN");
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GUI_InitMenu(m);
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if (config.aspect)
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m->max_items = 7;
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else
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m->max_items = 8;
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GUI_SlideMenuTitle(m,strlen("Video "));
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while (quit == 0)
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@ -944,40 +997,40 @@ static void videomenu ()
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if (config.aspect == 1) sprintf (items[5].text,"Aspect: ORIGINAL (4:3)");
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else if (config.aspect == 2) sprintf (items[5].text, "Aspect: ORIGINAL (16:9)");
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else sprintf (items[5].text, "Aspect: FIT SCREEN");
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if (config.aspect)
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{
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/* disable items */
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m->max_items = 7;
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/* reset menu selection */
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if (m->offset > 3)
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{
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m->offset = 3;
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m->selected = 2;
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}
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}
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else
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{
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/* enable items */
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m->max_items = 8;
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}
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break;
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/* case 6:
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case -8:
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if (ret<0) config.xshift --;
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else config.xshift ++;
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case 6:
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break;
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case 7:
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case -9:
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if (ret<0) config.yshift --;
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else config.yshift ++;
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break;
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case 8:
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case -10:
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if (config.aspect) break;
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if (ret<0) config.xscale --;
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else config.xscale ++;
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break;
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case 9:
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case -11:
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if (config.aspect) break;
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if (ret<0) config.yscale --;
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else config.yscale ++;
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break;
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*/
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case -1:
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quit = 1;
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break;
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}
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}
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m->max_items = 8;
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GUI_DeleteMenu(m);
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}
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129
source/sound/eq.c
Normal file
129
source/sound/eq.c
Normal file
@ -0,0 +1,129 @@
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//----------------------------------------------------------------------------
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//
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// 3 Band EQ :)
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//
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// EQ.C - Main Source file for 3 band EQ
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//
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// (c) Neil C / Etanza Systems / 2K6
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//
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// Shouts / Loves / Moans = etanza at lycos dot co dot uk
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//
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// This work is hereby placed in the public domain for all purposes, including
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// use in commercial applications.
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//
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// The author assumes NO RESPONSIBILITY for any problems caused by the use of
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// this software.
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//
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//----------------------------------------------------------------------------
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// NOTES :
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//
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// - Original filter code by Paul Kellet (musicdsp.pdf)
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//
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// - Uses 4 first order filters in series, should give 24dB per octave
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//
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// - Now with P4 Denormal fix :)
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//----------------------------------------------------------------------------
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// ----------
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//| Includes |
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// ----------
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#include <stdio.h>
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#include <string.h>
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#include <math.h>
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#include "eq.h"
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// -----------
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//| Constants |
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// -----------
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static double vsa = (1.0 / 4294967295.0); // Very small amount (Denormal Fix)
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// ---------------
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//| Initialise EQ |
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// ---------------
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// Recommended frequencies are ...
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//
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// lowfreq = 880 Hz
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// highfreq = 5000 Hz
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//
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// Set mixfreq to whatever rate your system is using (eg 48Khz)
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void init_3band_state(EQSTATE * es, int lowfreq, int highfreq, int mixfreq)
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{
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// Clear state
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memset(es, 0, sizeof(EQSTATE));
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// Set Low/Mid/High gains to unity
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es->lg = 1.0;
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es->mg = 1.0;
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es->hg = 1.0;
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// Calculate filter cutoff frequencies
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es->lf = 2 * sin(M_PI * ((double) lowfreq / (double) mixfreq));
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es->hf = 2 * sin(M_PI * ((double) highfreq / (double) mixfreq));
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}
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// ---------------
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//| EQ one sample |
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// ---------------
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// - sample can be any range you like :)
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//
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// Note that the output will depend on the gain settings for each band
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// (especially the bass) so may require clipping before output, but you
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// knew that anyway :)
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double do_3band(EQSTATE * es, int sample)
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{
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// Locals
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double l, m, h; // Low / Mid / High - Sample Values
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// Filter #1 (lowpass)
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es->f1p0 += (es->lf * ((double) sample - es->f1p0)) + vsa;
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es->f1p1 += (es->lf * (es->f1p0 - es->f1p1));
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es->f1p2 += (es->lf * (es->f1p1 - es->f1p2));
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es->f1p3 += (es->lf * (es->f1p2 - es->f1p3));
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l = es->f1p3;
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// Filter #2 (highpass)
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es->f2p0 += (es->hf * ((double) sample - es->f2p0)) + vsa;
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es->f2p1 += (es->hf * (es->f2p0 - es->f2p1));
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es->f2p2 += (es->hf * (es->f2p1 - es->f2p2));
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es->f2p3 += (es->hf * (es->f2p2 - es->f2p3));
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h = es->sdm3 - es->f2p3;
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// Calculate midrange (signal - (low + high))
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m = es->sdm3 - (h + l);
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// Scale, Combine and store
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l *= es->lg;
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m *= es->mg;
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h *= es->hg;
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// Shuffle history buffer
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es->sdm3 = es->sdm2;
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es->sdm2 = es->sdm1;
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es->sdm1 = sample;
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// Return result
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return (int) (l + m + h);
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}
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67
source/sound/eq.h
Normal file
67
source/sound/eq.h
Normal file
@ -0,0 +1,67 @@
|
||||
//---------------------------------------------------------------------------
|
||||
//
|
||||
// 3 Band EQ :)
|
||||
//
|
||||
// EQ.H - Header file for 3 band EQ
|
||||
//
|
||||
// (c) Neil C / Etanza Systems / 2K6
|
||||
//
|
||||
// Shouts / Loves / Moans = etanza at lycos dot co dot uk
|
||||
//
|
||||
// This work is hereby placed in the public domain for all purposes, including
|
||||
// use in commercial applications.
|
||||
//
|
||||
// The author assumes NO RESPONSIBILITY for any problems caused by the use of
|
||||
// this software.
|
||||
//
|
||||
//----------------------------------------------------------------------------
|
||||
|
||||
#ifndef __EQ3BAND__
|
||||
#define __EQ3BAND__
|
||||
|
||||
// ------------
|
||||
//| Structures |
|
||||
// ------------
|
||||
|
||||
typedef struct {
|
||||
// Filter #1 (Low band)
|
||||
|
||||
double lf; // Frequency
|
||||
double f1p0; // Poles ...
|
||||
double f1p1;
|
||||
double f1p2;
|
||||
double f1p3;
|
||||
|
||||
// Filter #2 (High band)
|
||||
|
||||
double hf; // Frequency
|
||||
double f2p0; // Poles ...
|
||||
double f2p1;
|
||||
double f2p2;
|
||||
double f2p3;
|
||||
|
||||
// Sample history buffer
|
||||
|
||||
double sdm1; // Sample data minus 1
|
||||
double sdm2; // 2
|
||||
double sdm3; // 3
|
||||
|
||||
// Gain Controls
|
||||
|
||||
double lg; // low gain
|
||||
double mg; // mid gain
|
||||
double hg; // high gain
|
||||
|
||||
} EQSTATE;
|
||||
|
||||
|
||||
// ---------
|
||||
//| Exports |
|
||||
// ---------
|
||||
|
||||
extern void init_3band_state(EQSTATE * es, int lowfreq, int highfreq,
|
||||
int mixfreq);
|
||||
extern double do_3band(EQSTATE * es, int sample);
|
||||
|
||||
|
||||
#endif // #ifndef __EQ3BAND__
|
||||
@ -23,6 +23,7 @@
|
||||
|
||||
#include "shared.h"
|
||||
#include "samplerate.h"
|
||||
#include "eq.h"
|
||||
|
||||
#define SND_SIZE (snd.buffer_size * sizeof(int16))
|
||||
|
||||
@ -37,21 +38,36 @@ uint32 line_z80;
|
||||
int32 current_z80;
|
||||
uint8 system_hw;
|
||||
|
||||
/* SRC */
|
||||
static SRC_DATA src_data;
|
||||
/****************************************************************
|
||||
* AUDIO equalizer
|
||||
****************************************************************/
|
||||
static EQSTATE eq;
|
||||
|
||||
static int ll, rr;
|
||||
void audio_init_equalizer(void)
|
||||
{
|
||||
init_3band_state(&eq,880,5000,snd.sample_rate);
|
||||
audio_set_equalizer();
|
||||
}
|
||||
|
||||
void audio_set_equalizer(void)
|
||||
{
|
||||
eq.lg = (double)(config.lg);
|
||||
eq.mg = (double)(config.mg);
|
||||
eq.hg = (double)(config.hg);
|
||||
}
|
||||
|
||||
/****************************************************************
|
||||
* AUDIO stream update
|
||||
****************************************************************/
|
||||
static int ll, rr;
|
||||
static SRC_DATA src_data;
|
||||
|
||||
void audio_update (int size)
|
||||
{
|
||||
int i;
|
||||
int l, r;
|
||||
int psg_preamp = config.psg_preamp;
|
||||
int fm_preamp = config.fm_preamp;
|
||||
int boost = config.boost;
|
||||
int filter = config.filter;
|
||||
|
||||
#ifndef DOS
|
||||
@ -109,18 +125,21 @@ void audio_update (int size)
|
||||
*fm_r++ = 0;
|
||||
}
|
||||
|
||||
/* single-pole low-pass filter (6 dB/octave) */
|
||||
if (filter)
|
||||
/* filtering */
|
||||
if (filter & 1)
|
||||
{
|
||||
/* single-pole low-pass filter (6 dB/octave) */
|
||||
l = (ll + l) >> 1;
|
||||
r = (rr + r) >> 1;
|
||||
ll = l;
|
||||
rr = r;
|
||||
}
|
||||
|
||||
/* boost volume if asked*/
|
||||
l = l * boost;
|
||||
r = r * boost;
|
||||
else if (filter & 2)
|
||||
{
|
||||
/* 3 Band EQ */
|
||||
l = do_3band(&eq,l);
|
||||
r = do_3band(&eq,r);
|
||||
}
|
||||
|
||||
/* clipping */
|
||||
if (l > 32767) l = 32767;
|
||||
@ -200,6 +219,9 @@ int audio_init (int rate)
|
||||
snd.psg.buffer = (int16 *)malloc (SND_SIZE);
|
||||
if (!snd.psg.buffer) return (-1);
|
||||
|
||||
/* 3 band EQ */
|
||||
audio_init_equalizer();
|
||||
|
||||
/* Set audio enable flag */
|
||||
snd.enabled = 1;
|
||||
|
||||
|
||||
@ -91,13 +91,15 @@ extern int32 current_z80;
|
||||
extern uint8 system_hw;
|
||||
|
||||
/* Function prototypes */
|
||||
extern void audio_init_equalizer(void);
|
||||
extern void audio_set_equalizer(void);
|
||||
extern int audio_init (int rate);
|
||||
extern void audio_shutdown (void);
|
||||
extern void audio_update (int len);
|
||||
extern void system_init (void);
|
||||
extern void system_reset (void);
|
||||
extern void system_shutdown (void);
|
||||
extern int system_frame(int skip);
|
||||
extern int audio_init (int rate);
|
||||
extern void audio_shutdown (void);
|
||||
extern void audio_update (int len);
|
||||
|
||||
#endif /* _SYSTEM_H_ */
|
||||
|
||||
|
||||
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Reference in New Issue
Block a user