ref: 131efd2855b2dea7a6d00761bac69111516251da
parent: 2d87009441efdc4fad9b3cb74bc0dd3288e87a9b
author: Roman Fomin <rfomin@gmail.com>
date: Sat Nov 27 07:01:43 EST 2021
win midi: Non-linear volume control
--- a/src/i_winmusic.c
+++ b/src/i_winmusic.c
@@ -83,6 +83,25 @@
static buffer_t buffer;
+static const int volume_correction[] = {+ 0, 4, 7, 11, 13, 14, 16, 18,
+ 21, 22, 23, 24, 24, 24, 25, 25,
+ 25, 26, 26, 27, 27, 27, 28, 28,
+ 29, 29, 29, 30, 30, 31, 31, 32,
+ 32, 32, 33, 33, 34, 34, 35, 35,
+ 36, 37, 37, 38, 38, 39, 39, 40,
+ 40, 41, 42, 42, 43, 43, 44, 45,
+ 45, 46, 47, 47, 48, 49, 49, 50,
+ 51, 52, 52, 53, 54, 55, 56, 56,
+ 57, 58, 59, 60, 61, 62, 62, 63,
+ 64, 65, 66, 67, 68, 69, 70, 71,
+ 72, 73, 74, 75, 77, 78, 79, 80,
+ 81, 82, 84, 85, 86, 87, 89, 90,
+ 91, 92, 94, 95, 96, 98, 99, 101,
+ 102, 104, 105, 107, 108, 110, 112, 113,
+ 115, 117, 118, 120, 122, 123, 125, 127
+};
+
// Message box for midiStream errors.
static void MidiErrorMessageBox(DWORD dwError)
@@ -134,6 +153,8 @@
volume *= volume_factor;
+ volume = volume_correction[volume];
+
event->dwEvent = (event->dwEvent & 0xFF00FFFF) |
((volume & 0x7F) << 16);
}
@@ -359,11 +380,14 @@
// Send MIDI controller events to adjust the volume.
for (i = 0; i < MIDI_CHANNELS_PER_TRACK; ++i)
{+ DWORD msg = 0;
+
int value = channel_volume[i] * volume_factor;
- DWORD msg = MIDI_EVENT_CONTROLLER | i |
- (MIDI_CONTROLLER_MAIN_VOLUME << 8) |
- (value << 16);
+ value = volume_correction[value];
+
+ msg = MIDI_EVENT_CONTROLLER | i | (MIDI_CONTROLLER_MAIN_VOLUME << 8) |
+ (value << 16);
midiOutShortMsg((HMIDIOUT)hMidiStream, msg);
}