Files
@ r18901:72cf09d1221f
Branch filter:
Location: cpp/openttd-patchpack/source/src/mixer.cpp - annotation
r18901:72cf09d1221f
5.7 KiB
text/x-c
(svn r23760) -Feature: Allow readonly display of NewGRF parameters, if GRF list may not be edited.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 | r5584:545d748cc681 r5584:545d748cc681 r12768:980ae0491352 r12768:980ae0491352 r12768:980ae0491352 r12768:980ae0491352 r12768:980ae0491352 r12768:980ae0491352 r12768:980ae0491352 r9111:983de9c5a848 r6201:2e76eb9a1d7a r5584:545d748cc681 r14734:58c3f99dc69c r9632:ffa59673c0a8 r5584:545d748cc681 r5584:545d748cc681 r5584:545d748cc681 r5584:545d748cc681 r6201:2e76eb9a1d7a r5584:545d748cc681 r5584:545d748cc681 r6201:2e76eb9a1d7a r5584:545d748cc681 r5584:545d748cc681 r5584:545d748cc681 r5584:545d748cc681 r5584:545d748cc681 r6201:2e76eb9a1d7a r9632:ffa59673c0a8 r9632:ffa59673c0a8 r12675:08178fc9d621 r12675:08178fc9d621 r5584:545d748cc681 r5584:545d748cc681 r5584:545d748cc681 r12350:654ff1f37bc4 r14273:79f9c8f3fcad r5584:545d748cc681 r9632:ffa59673c0a8 r9632:ffa59673c0a8 r9632:ffa59673c0a8 r9632:ffa59673c0a8 r9632:ffa59673c0a8 r9632:ffa59673c0a8 r9632:ffa59673c0a8 r9632:ffa59673c0a8 r12679:1015c7a9aebf r12679:1015c7a9aebf r12679:1015c7a9aebf r12679:1015c7a9aebf r12679:1015c7a9aebf r12679:1015c7a9aebf r12679:1015c7a9aebf r12679:1015c7a9aebf r12679:1015c7a9aebf r12679:1015c7a9aebf r12679:1015c7a9aebf r12679:1015c7a9aebf r12679:1015c7a9aebf r12675:08178fc9d621 r12675:08178fc9d621 r12675:08178fc9d621 r12675:08178fc9d621 r12675:08178fc9d621 r12675:08178fc9d621 r14271:86e78183a586 r14271:86e78183a586 r14271:86e78183a586 r14271:86e78183a586 r14271:86e78183a586 r12675:08178fc9d621 r12675:08178fc9d621 r12675:08178fc9d621 r12675:08178fc9d621 r12675:08178fc9d621 r12675:08178fc9d621 r12675:08178fc9d621 r12675:08178fc9d621 r12675:08178fc9d621 r12675:08178fc9d621 r12675:08178fc9d621 r12679:1015c7a9aebf r12679:1015c7a9aebf r12679:1015c7a9aebf r12675:08178fc9d621 r12675:08178fc9d621 r12675:08178fc9d621 r12675:08178fc9d621 r12675:08178fc9d621 r12675:08178fc9d621 r12675:08178fc9d621 r12675:08178fc9d621 r14271:86e78183a586 r12675:08178fc9d621 r5584:545d748cc681 r5584:545d748cc681 r5584:545d748cc681 r5584:545d748cc681 r5584:545d748cc681 r5584:545d748cc681 r5584:545d748cc681 r14271:86e78183a586 r14271:86e78183a586 r14271:86e78183a586 r14271:86e78183a586 r14271:86e78183a586 r5584:545d748cc681 r5584:545d748cc681 r6201:2e76eb9a1d7a r5584:545d748cc681 r9632:ffa59673c0a8 r9643:b1c2cad654f9 r5584:545d748cc681 r5584:545d748cc681 r5584:545d748cc681 r5584:545d748cc681 r5584:545d748cc681 r12679:1015c7a9aebf r12679:1015c7a9aebf r12679:1015c7a9aebf r5584:545d748cc681 r5584:545d748cc681 r5584:545d748cc681 r5584:545d748cc681 r5584:545d748cc681 r5584:545d748cc681 r5584:545d748cc681 r5584:545d748cc681 r5584:545d748cc681 r5584:545d748cc681 r5584:545d748cc681 r5584:545d748cc681 r5584:545d748cc681 r5584:545d748cc681 r5584:545d748cc681 r5584:545d748cc681 r5584:545d748cc681 r5584:545d748cc681 r5584:545d748cc681 r5584:545d748cc681 r6201:2e76eb9a1d7a r5584:545d748cc681 r5584:545d748cc681 r6201:2e76eb9a1d7a r5584:545d748cc681 r5584:545d748cc681 r12675:08178fc9d621 r12675:08178fc9d621 r12675:08178fc9d621 r12675:08178fc9d621 r12675:08178fc9d621 r5584:545d748cc681 r5584:545d748cc681 r5584:545d748cc681 r5584:545d748cc681 r5584:545d748cc681 r6247:96e840dbefcc r5584:545d748cc681 r5584:545d748cc681 r15542:f6c6d0f8689e r14267:7c0610071c99 r14267:7c0610071c99 r14267:7c0610071c99 r5584:545d748cc681 r5584:545d748cc681 r15542:f6c6d0f8689e r5584:545d748cc681 r5584:545d748cc681 r5584:545d748cc681 r12675:08178fc9d621 r5584:545d748cc681 r5584:545d748cc681 r5584:545d748cc681 r5584:545d748cc681 r5584:545d748cc681 r5584:545d748cc681 r5584:545d748cc681 r14273:79f9c8f3fcad r14273:79f9c8f3fcad r6201:2e76eb9a1d7a r14273:79f9c8f3fcad r5584:545d748cc681 r5584:545d748cc681 r5584:545d748cc681 r5584:545d748cc681 r14273:79f9c8f3fcad r12675:08178fc9d621 r5584:545d748cc681 r5584:545d748cc681 r14734:58c3f99dc69c r14734:58c3f99dc69c r14734:58c3f99dc69c r14734:58c3f99dc69c r14734:58c3f99dc69c r14734:58c3f99dc69c r14734:58c3f99dc69c r5584:545d748cc681 r14734:58c3f99dc69c r14734:58c3f99dc69c r14898:8e3ea8ec8eab r14898:8e3ea8ec8eab r5584:545d748cc681 r5584:545d748cc681 r5584:545d748cc681 r10647:62911ec68e89 r5584:545d748cc681 r5584:545d748cc681 r5584:545d748cc681 r5584:545d748cc681 r5584:545d748cc681 r5584:545d748cc681 r5584:545d748cc681 r5584:545d748cc681 r14273:79f9c8f3fcad r5584:545d748cc681 r5584:545d748cc681 | /* $Id$ */
/*
* This file is part of OpenTTD.
* OpenTTD 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, version 2.
* OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
* See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
*/
/** @file mixer.cpp Mixing of sound samples. */
#include "stdafx.h"
#include <math.h>
#include "core/math_func.hpp"
struct MixerChannel {
bool active;
/* pointer to allocated buffer memory */
int8 *memory;
/* current position in memory */
uint32 pos;
uint32 frac_pos;
uint32 frac_speed;
uint32 samples_left;
/* Mixing volume */
int volume_left;
int volume_right;
bool is16bit;
};
static MixerChannel _channels[8];
static uint32 _play_rate = 11025;
static uint32 _max_size = UINT_MAX;
/**
* The theoretical maximum volume for a single sound sample. Multiple sound
* samples should not exceed this limit as it will sound too loud. It also
* stops overflowing when too many sounds are played at the same time, which
* causes an even worse sound quality.
*/
static const int MAX_VOLUME = 128 * 128;
/**
* Perform the rate conversion between the input and output.
* @param b the buffer to read the data from
* @param frac_pos the position from the begin of the buffer till the next element
* @tparam T the size of the buffer (8 or 16 bits)
* @return the converted value.
*/
template <typename T>
static int RateConversion(T *b, int frac_pos)
{
return ((b[0] * ((1 << 16) - frac_pos)) + (b[1] * frac_pos)) >> 16;
}
static void mix_int16(MixerChannel *sc, int16 *buffer, uint samples)
{
if (samples > sc->samples_left) samples = sc->samples_left;
sc->samples_left -= samples;
assert(samples > 0);
const int16 *b = (const int16 *)sc->memory + sc->pos;
uint32 frac_pos = sc->frac_pos;
uint32 frac_speed = sc->frac_speed;
int volume_left = sc->volume_left;
int volume_right = sc->volume_right;
if (frac_speed == 0x10000) {
/* Special case when frac_speed is 0x10000 */
do {
buffer[0] = Clamp(buffer[0] + (*b * volume_left >> 16), -MAX_VOLUME, MAX_VOLUME);
buffer[1] = Clamp(buffer[1] + (*b * volume_right >> 16), -MAX_VOLUME, MAX_VOLUME);
b++;
buffer += 2;
} while (--samples > 0);
} else {
do {
int data = RateConversion(b, frac_pos);
buffer[0] = Clamp(buffer[0] + (data * volume_left >> 16), -MAX_VOLUME, MAX_VOLUME);
buffer[1] = Clamp(buffer[1] + (data * volume_right >> 16), -MAX_VOLUME, MAX_VOLUME);
buffer += 2;
frac_pos += frac_speed;
b += frac_pos >> 16;
frac_pos &= 0xffff;
} while (--samples > 0);
}
sc->frac_pos = frac_pos;
sc->pos = b - (const int16 *)sc->memory;
}
static void mix_int8_to_int16(MixerChannel *sc, int16 *buffer, uint samples)
{
if (samples > sc->samples_left) samples = sc->samples_left;
sc->samples_left -= samples;
assert(samples > 0);
const int8 *b = sc->memory + sc->pos;
uint32 frac_pos = sc->frac_pos;
uint32 frac_speed = sc->frac_speed;
int volume_left = sc->volume_left;
int volume_right = sc->volume_right;
if (frac_speed == 0x10000) {
/* Special case when frac_speed is 0x10000 */
do {
buffer[0] = Clamp(buffer[0] + (*b * volume_left >> 8), -MAX_VOLUME, MAX_VOLUME);
buffer[1] = Clamp(buffer[1] + (*b * volume_right >> 8), -MAX_VOLUME, MAX_VOLUME);
b++;
buffer += 2;
} while (--samples > 0);
} else {
do {
int data = RateConversion(b, frac_pos);
buffer[0] = Clamp(buffer[0] + (data * volume_left >> 8), -MAX_VOLUME, MAX_VOLUME);
buffer[1] = Clamp(buffer[1] + (data * volume_right >> 8), -MAX_VOLUME, MAX_VOLUME);
buffer += 2;
frac_pos += frac_speed;
b += frac_pos >> 16;
frac_pos &= 0xffff;
} while (--samples > 0);
}
sc->frac_pos = frac_pos;
sc->pos = b - sc->memory;
}
static void MxCloseChannel(MixerChannel *mc)
{
mc->active = false;
}
void MxMixSamples(void *buffer, uint samples)
{
MixerChannel *mc;
/* Clear the buffer */
memset(buffer, 0, sizeof(int16) * 2 * samples);
/* Mix each channel */
for (mc = _channels; mc != endof(_channels); mc++) {
if (mc->active) {
if (mc->is16bit) {
mix_int16(mc, (int16*)buffer, samples);
} else {
mix_int8_to_int16(mc, (int16*)buffer, samples);
}
if (mc->samples_left == 0) MxCloseChannel(mc);
}
}
}
MixerChannel *MxAllocateChannel()
{
MixerChannel *mc;
for (mc = _channels; mc != endof(_channels); mc++) {
if (!mc->active) {
free(mc->memory);
mc->memory = NULL;
return mc;
}
}
return NULL;
}
void MxSetChannelRawSrc(MixerChannel *mc, int8 *mem, size_t size, uint rate, bool is16bit)
{
mc->memory = mem;
mc->frac_pos = 0;
mc->pos = 0;
mc->frac_speed = (rate << 16) / _play_rate;
if (is16bit) size /= 2;
/* adjust the magnitude to prevent overflow */
while (size >= _max_size) {
size >>= 1;
rate = (rate >> 1) + 1;
}
mc->samples_left = (uint)size * _play_rate / rate;
mc->is16bit = is16bit;
}
/**
* Set volume and pan parameters for a sound.
* @param mc MixerChannel to set
* @param volume Volume level for sound, range is 0..16384
* @param pan Pan position for sound, range is 0..1
*/
void MxSetChannelVolume(MixerChannel *mc, uint volume, float pan)
{
/* Use sinusoidal pan to maintain overall sound power level regardless
* of position. */
mc->volume_left = (uint)(sin((1.0 - pan) * M_PI / 2.0) * volume);
mc->volume_right = (uint)(sin(pan * M_PI / 2.0) * volume);
}
void MxActivateChannel(MixerChannel *mc)
{
mc->active = true;
}
bool MxInitialize(uint rate)
{
_play_rate = rate;
_max_size = UINT_MAX / _play_rate;
return true;
}
|