Mercurial > games > semicongine

annotate semiconginev2/audio/mixer.nim @ 1234:841e12f33c47

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add: text & font rendering, not tested yet
author sam <sam@basx.dev>
date Sat, 20 Jul 2024 00:03:57 +0700
parents a3fa15c25026
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
1224
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diff changeset
1 const NBUFFERS = 32
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2 const BUFFERSAMPLECOUNT = 256
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3 const AUDIO_SAMPLE_RATE* = 44100
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4
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5 type
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6 Level* = 0'f .. 1'f
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7 Sample* = array[2, int16]
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8 SoundData* = seq[Sample]
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9
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10 Playback = object
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11 sound: SoundData
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12 position: int
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13 loop: bool
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14 levelLeft: Level
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15 levelRight: Level
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16 paused: bool
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17 Track = object
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18 playing: Table[uint64, Playback]
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19 level: Level
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20 targetLevel: Level
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21 fadeTime: float
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22 fadeStep: float
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23
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24 when defined(windows):
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25 include ./platform/windows
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26 when defined(linux):
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27 include ./platform/linux
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28
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29 type
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30 Mixer* = object
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31 playbackCounter: uint64
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32 tracks: Table[string, Track]
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33 sounds*: Table[string, SoundData]
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34 level: Level
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35 device: NativeSoundDevice
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36 lock: Lock
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37 buffers: seq[SoundData]
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38 currentBuffer: int
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39 lastUpdate: MonoTime
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40
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41 proc initMixer(): Mixer =
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42 result = Mixer(
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43 tracks: {"": Track(level: 1'f)}.toTable,
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44 level: 1'f,
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45 )
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46 result.lock.initLock()
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47
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48 proc setupDevice(mixer: var Mixer) =
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49 # call this inside audio thread
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50 var bufferaddresses: seq[ptr SoundData]
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51 for i in 0 ..< NBUFFERS:
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52 mixer.buffers.add newSeq[Sample](BUFFERSAMPLECOUNT)
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53 for i in 0 ..< mixer.buffers.len:
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54 bufferaddresses.add (addr mixer.buffers[i])
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55 mixer.device = OpenSoundDevice(AUDIO_SAMPLE_RATE, bufferaddresses)
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56
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57 # TODO: this should probably be in the load-code-stuff
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58 # proc LoadSound*(mixer: var Mixer, name: string, resource: string) =
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59 # assert not (name in mixer.sounds)
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60 # mixer.sounds[name] = LoadAudio(resource)
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61
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62 proc AddSound*(mixer: var Mixer, name: string, sound: SoundData) =
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63 assert not (name in mixer.sounds)
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64 mixer.sounds[name] = sound
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65
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66 proc ReplaceSound*(mixer: var Mixer, name: string, sound: SoundData) =
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67 assert (name in mixer.sounds)
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68 mixer.sounds[name] = sound
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69
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70 proc AddTrack*(mixer: var Mixer, name: string, level: Level = 1'f) =
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71 assert not (name in mixer.tracks)
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72 mixer.lock.withLock():
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73 mixer.tracks[name] = Track(level: level)
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74
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75 proc Play*(mixer: var Mixer, soundName: string, track = "", stopOtherSounds = false, loop = false, levelLeft, levelRight: Level): uint64 =
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76 assert track in mixer.tracks, &"Track '{track}' does not exists"
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77 assert soundName in mixer.sounds, soundName & " not loaded"
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78 mixer.lock.withLock():
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79 if stopOtherSounds:
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80 mixer.tracks[track].playing.clear()
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81 mixer.tracks[track].playing[mixer.playbackCounter] = Playback(
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82 sound: mixer.sounds[soundName],
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83 position: 0,
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84 loop: loop,
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85 levelLeft: levelLeft,
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86 levelRight: levelRight,
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87 paused: false,
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88 )
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89 result = mixer.playbackCounter
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90 inc mixer.playbackCounter
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91
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92 proc Play*(mixer: var Mixer, soundName: string, track = "", stopOtherSounds = false, loop = false, level: Level = 1'f): uint64 =
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93 Play(
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94 mixer = mixer,
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95 soundName = soundName,
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96 track = track,
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97 stopOtherSounds = stopOtherSounds,
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98 loop = loop,
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99 levelLeft = level,
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100 levelRight = level
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101 )
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102
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103 proc Stop*(mixer: var Mixer) =
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104 mixer.lock.withLock():
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105 for track in mixer.tracks.mvalues:
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106 track.playing.clear()
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107
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108 proc GetLevel*(mixer: var Mixer): Level = mixer.level
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109 proc GetLevel*(mixer: var Mixer, track: string): Level = mixer.tracks[track].level
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110 proc GetLevel*(mixer: var Mixer, playbackId: uint64): (Level, Level) =
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111 for track in mixer.tracks.mvalues:
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112 if playbackId in track.playing:
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113 return (track.playing[playbackId].levelLeft, track.playing[playbackId].levelRight)
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114
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115 proc SetLevel*(mixer: var Mixer, level: Level) = mixer.level = level
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116 proc SetLevel*(mixer: var Mixer, track: string, level: Level) =
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117 mixer.lock.withLock():
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118 mixer.tracks[track].level = level
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119 proc SetLevel*(mixer: var Mixer, playbackId: uint64, levelLeft, levelRight: Level) =
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120 mixer.lock.withLock():
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121 for track in mixer.tracks.mvalues:
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122 if playbackId in track.playing:
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123 track.playing[playbackId].levelLeft = levelLeft
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124 track.playing[playbackId].levelRight = levelRight
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125 proc SetLevel*(mixer: var Mixer, playbackId: uint64, level: Level) =
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126 SetLevel(mixer, playbackId, level, level)
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127
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128 proc Stop*(mixer: var Mixer, track: string) =
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129 assert track in mixer.tracks
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130 mixer.lock.withLock():
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131 mixer.tracks[track].playing.clear()
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132
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133 proc Stop*(mixer: var Mixer, playbackId: uint64) =
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134 mixer.lock.withLock():
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135 for track in mixer.tracks.mvalues:
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136 if playbackId in track.playing:
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137 track.playing.del(playbackId)
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138 break
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139
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140 proc Pause*(mixer: var Mixer, value: bool) =
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141 mixer.lock.withLock():
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142 for track in mixer.tracks.mvalues:
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143 for playback in track.playing.mvalues:
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144 playback.paused = value
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145
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146 proc Pause*(mixer: var Mixer, track: string, value: bool) =
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147 mixer.lock.withLock():
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148 for playback in mixer.tracks[track].playing.mvalues:
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149 playback.paused = value
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150
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151 proc Pause*(mixer: var Mixer, playbackId: uint64, value: bool) =
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152 mixer.lock.withLock():
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153 for track in mixer.tracks.mvalues:
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sam <sam@basx.dev>
parents:
diff changeset
154 if playbackId in track.playing:
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sam <sam@basx.dev>
parents:
diff changeset
155 track.playing[playbackId].paused = value
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sam <sam@basx.dev>
parents:
diff changeset
156
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sam <sam@basx.dev>
parents:
diff changeset
157 proc Pause*(mixer: var Mixer) = mixer.Pause(true)
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sam <sam@basx.dev>
parents:
diff changeset
158 proc Pause*(mixer: var Mixer, track: string) = mixer.Pause(track, true)
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sam <sam@basx.dev>
parents:
diff changeset
159 proc Pause*(mixer: var Mixer, playbackId: uint64) = mixer.Pause(playbackId, true)
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sam <sam@basx.dev>
parents:
diff changeset
160 proc Unpause*(mixer: var Mixer) = mixer.Pause(false)
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sam <sam@basx.dev>
parents:
diff changeset
161 proc Unpause*(mixer: var Mixer, track: string) = mixer.Pause(track, false)
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sam <sam@basx.dev>
parents:
diff changeset
162 proc Unpause*(mixer: var Mixer, playbackId: uint64) = mixer.Pause(playbackId, false)
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sam <sam@basx.dev>
parents:
diff changeset
163
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sam <sam@basx.dev>
parents:
diff changeset
164 proc FadeTo*(mixer: var Mixer, track: string, level: Level, time: float) =
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sam <sam@basx.dev>
parents:
diff changeset
165 mixer.tracks[track].targetLevel = level
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sam <sam@basx.dev>
parents:
diff changeset
166 mixer.tracks[track].fadeTime = time
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sam <sam@basx.dev>
parents:
diff changeset
167 mixer.tracks[track].fadeStep = level.float - mixer.tracks[track].level.float / time
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sam <sam@basx.dev>
parents:
diff changeset
168
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sam <sam@basx.dev>
parents:
diff changeset
169 proc IsPlaying*(mixer: var Mixer): bool =
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sam <sam@basx.dev>
parents:
diff changeset
170 mixer.lock.withLock():
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sam <sam@basx.dev>
parents:
diff changeset
171 for track in mixer.tracks.mvalues:
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sam <sam@basx.dev>
parents:
diff changeset
172 for playback in track.playing.values:
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sam <sam@basx.dev>
parents:
diff changeset
173 if not playback.paused:
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sam <sam@basx.dev>
parents:
diff changeset
174 return true
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sam <sam@basx.dev>
parents:
diff changeset
175 return false
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sam <sam@basx.dev>
parents:
diff changeset
176
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sam <sam@basx.dev>
parents:
diff changeset
177 proc IsPlaying*(mixer: var Mixer, track: string): bool =
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sam <sam@basx.dev>
parents:
diff changeset
178 mixer.lock.withLock():
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sam <sam@basx.dev>
parents:
diff changeset
179 if mixer.tracks.contains(track):
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sam <sam@basx.dev>
parents:
diff changeset
180 for playback in mixer.tracks[track].playing.values:
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sam <sam@basx.dev>
parents:
diff changeset
181 if not playback.paused:
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sam <sam@basx.dev>
parents:
diff changeset
182 return true
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sam <sam@basx.dev>
parents:
diff changeset
183 return false
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sam <sam@basx.dev>
parents:
diff changeset
184
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sam <sam@basx.dev>
parents:
diff changeset
185 func applyLevel(sample: Sample, levelLeft, levelRight: Level): Sample =
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sam <sam@basx.dev>
parents:
diff changeset
186 [int16(float(sample[0]) * levelLeft), int16(float(sample[1]) * levelRight)]
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sam <sam@basx.dev>
parents:
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187
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sam <sam@basx.dev>
parents:
diff changeset
188 func clip(value: int32): int16 =
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sam <sam@basx.dev>
parents:
diff changeset
189 int16(max(min(int32(high(int16)), value), int32(low(int16))))
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sam <sam@basx.dev>
parents:
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190
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sam <sam@basx.dev>
parents:
diff changeset
191 # used for combining sounds
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sam <sam@basx.dev>
parents:
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192 func mix(a, b: Sample): Sample =
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sam <sam@basx.dev>
parents:
diff changeset
193 [
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sam <sam@basx.dev>
parents:
diff changeset
194 clip(int32(a[0]) + int32(b[0])),
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sam <sam@basx.dev>
parents:
diff changeset
195 clip(int32(a[1]) + int32(b[1])),
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sam <sam@basx.dev>
parents:
diff changeset
196 ]
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sam <sam@basx.dev>
parents:
diff changeset
197
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sam <sam@basx.dev>
parents:
diff changeset
198 proc updateSoundBuffer(mixer: var Mixer) =
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sam <sam@basx.dev>
parents:
diff changeset
199 let t = getMonoTime()
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sam <sam@basx.dev>
parents:
diff changeset
200
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sam <sam@basx.dev>
parents:
diff changeset
201 let dt = (t - mixer.lastUpdate).inNanoseconds.float64 / 1_000_000_000'f64
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sam <sam@basx.dev>
parents:
diff changeset
202 mixer.lastUpdate = t
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sam <sam@basx.dev>
parents:
diff changeset
203
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sam <sam@basx.dev>
parents:
diff changeset
204 # update fadings
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sam <sam@basx.dev>
parents:
diff changeset
205 for track in mixer.tracks.mvalues:
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sam <sam@basx.dev>
parents:
diff changeset
206 if track.fadeTime > 0:
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sam <sam@basx.dev>
parents:
diff changeset
207 track.fadeTime -= dt
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sam <sam@basx.dev>
parents:
diff changeset
208 track.level = (track.level.float64 + track.fadeStep.float64 * dt).clamp(Level.low, Level.high)
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sam <sam@basx.dev>
parents:
diff changeset
209 if track.fadeTime <= 0:
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sam <sam@basx.dev>
parents:
diff changeset
210 track.level = track.targetLevel
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sam <sam@basx.dev>
parents:
diff changeset
211 # mix
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sam <sam@basx.dev>
parents:
diff changeset
212 for i in 0 ..< mixer.buffers[mixer.currentBuffer].len:
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sam <sam@basx.dev>
parents:
diff changeset
213 var mixedSample = [0'i16, 0'i16]
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sam <sam@basx.dev>
parents:
diff changeset
214 mixer.lock.withLock():
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sam <sam@basx.dev>
parents:
diff changeset
215 for track in mixer.tracks.mvalues:
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sam <sam@basx.dev>
parents:
diff changeset
216 var stoppedSounds: seq[uint64]
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sam <sam@basx.dev>
parents:
diff changeset
217 for (id, playback) in track.playing.mpairs:
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sam <sam@basx.dev>
parents:
diff changeset
218 if playback.paused:
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sam <sam@basx.dev>
parents:
diff changeset
219 continue
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sam <sam@basx.dev>
parents:
diff changeset
220 let sample = applyLevel(
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sam <sam@basx.dev>
parents:
diff changeset
221 playback.sound[playback.position],
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sam <sam@basx.dev>
parents:
diff changeset
222 mixer.level * track.level * playback.levelLeft,
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sam <sam@basx.dev>
parents:
diff changeset
223 mixer.level * track.level * playback.levelRight,
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sam <sam@basx.dev>
parents:
diff changeset
224 )
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sam <sam@basx.dev>
parents:
diff changeset
225 mixedSample = mix(mixedSample, sample)
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sam <sam@basx.dev>
parents:
diff changeset
226 inc playback.position
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sam <sam@basx.dev>
parents:
diff changeset
227 if playback.position >= playback.sound.len:
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sam <sam@basx.dev>
parents:
diff changeset
228 if playback.loop:
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sam <sam@basx.dev>
parents:
diff changeset
229 playback.position = 0
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sam <sam@basx.dev>
parents:
diff changeset
230 else:
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sam <sam@basx.dev>
parents:
diff changeset
231 stoppedSounds.add id
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sam <sam@basx.dev>
parents:
diff changeset
232 for id in stoppedSounds:
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sam <sam@basx.dev>
parents:
diff changeset
233 track.playing.del(id)
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sam <sam@basx.dev>
parents:
diff changeset
234 mixer.buffers[mixer.currentBuffer][i] = mixedSample
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sam <sam@basx.dev>
parents:
diff changeset
235 # send data to sound device
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sam <sam@basx.dev>
parents:
diff changeset
236 mixer.device.WriteSoundData(mixer.currentBuffer)
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sam <sam@basx.dev>
parents:
diff changeset
237 mixer.currentBuffer = (mixer.currentBuffer + 1) mod mixer.buffers.len
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sam <sam@basx.dev>
parents:
diff changeset
238
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sam <sam@basx.dev>
parents:
diff changeset
239 # DSP functions
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sam <sam@basx.dev>
parents:
diff changeset
240 # TODO: finish implementation, one day
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sam <sam@basx.dev>
parents:
diff changeset
241
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sam <sam@basx.dev>
parents:
diff changeset
242 #[
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sam <sam@basx.dev>
parents:
diff changeset
243 #
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sam <sam@basx.dev>
parents:
diff changeset
244 proc lowPassFilter(data: var SoundData, cutoff: int) =
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sam <sam@basx.dev>
parents:
diff changeset
245 let alpha = float(cutoff) / AUDIO_SAMPLE_RATE
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sam <sam@basx.dev>
parents:
diff changeset
246 var value = data[0]
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sam <sam@basx.dev>
parents:
diff changeset
247 for i in 0 ..< data.len:
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sam <sam@basx.dev>
parents:
diff changeset
248 value[0] += int16(alpha * float(data[i][0] - value[0]))
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sam <sam@basx.dev>
parents:
diff changeset
249 value[1] += int16(alpha * float(data[i][1] - value[1]))
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sam <sam@basx.dev>
parents:
diff changeset
250 data[i] = value
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sam <sam@basx.dev>
parents:
diff changeset
251
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sam <sam@basx.dev>
parents:
diff changeset
252 proc downsample(data: var SoundData, n: int) =
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sam <sam@basx.dev>
parents:
diff changeset
253 let newLen = (data.len - 1) div n + 1
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sam <sam@basx.dev>
parents:
diff changeset
254 for i in 0 ..< newLen:
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sam <sam@basx.dev>
parents:
diff changeset
255 data[i] = data[i * n]
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sam <sam@basx.dev>
parents:
diff changeset
256 data.setLen(newLen)
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sam <sam@basx.dev>
parents:
diff changeset
257
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sam <sam@basx.dev>
parents:
diff changeset
258 proc upsample(data: var SoundData, m: int) =
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sam <sam@basx.dev>
parents:
diff changeset
259 data.setLen(data.len * m)
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sam <sam@basx.dev>
parents:
diff changeset
260 var i = data.len - 1
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sam <sam@basx.dev>
parents:
diff changeset
261 while i < 0:
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sam <sam@basx.dev>
parents:
diff changeset
262 if i mod m == 0:
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sam <sam@basx.dev>
parents:
diff changeset
263 data[i] = data[i div m]
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sam <sam@basx.dev>
parents:
diff changeset
264 else:
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sam <sam@basx.dev>
parents:
diff changeset
265 data[i] = [0, 0]
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sam <sam@basx.dev>
parents:
diff changeset
266 i.dec
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sam <sam@basx.dev>
parents:
diff changeset
267
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sam <sam@basx.dev>
parents:
diff changeset
268 proc slowdown(data: var SoundData, m, n: int) =
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sam <sam@basx.dev>
parents:
diff changeset
269 data.upsample(m)
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sam <sam@basx.dev>
parents:
diff changeset
270 # TODO
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sam <sam@basx.dev>
parents:
diff changeset
271 # data.lowPassFilter(m)
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sam <sam@basx.dev>
parents:
diff changeset
272 data.downsample(n)
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sam <sam@basx.dev>
parents:
diff changeset
273
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sam <sam@basx.dev>
parents:
diff changeset
274 ]#
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sam <sam@basx.dev>
parents:
diff changeset
275
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sam <sam@basx.dev>
parents:
diff changeset
276 proc destroy(mixer: var Mixer) =
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sam <sam@basx.dev>
parents:
diff changeset
277 mixer.lock.deinitLock()
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sam <sam@basx.dev>
parents:
diff changeset
278 mixer.device.CloseSoundDevice()
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sam <sam@basx.dev>
parents:
diff changeset
279
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sam <sam@basx.dev>
parents:
diff changeset
280 var
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sam <sam@basx.dev>
parents:
diff changeset
281 mixer* = createShared(Mixer)
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sam <sam@basx.dev>
parents:
diff changeset
282 audiothread: Thread[void]
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sam <sam@basx.dev>
parents:
diff changeset
283
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sam <sam@basx.dev>
parents:
diff changeset
284 proc audioWorker() {.thread.} =
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sam <sam@basx.dev>
parents:
diff changeset
285 mixer[].setupDevice()
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sam <sam@basx.dev>
parents:
diff changeset
286 onThreadDestruction(proc() = mixer[].lock.withLock(mixer[].destroy()); freeShared(mixer))
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sam <sam@basx.dev>
parents:
diff changeset
287 while true:
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sam <sam@basx.dev>
parents:
diff changeset
288 mixer[].updateSoundBuffer()
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sam <sam@basx.dev>
parents:
diff changeset
289
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sam <sam@basx.dev>
parents:
diff changeset
290 # for thread priority (really necessary?)
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sam <sam@basx.dev>
parents:
diff changeset
291 when defined(windows):
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sam <sam@basx.dev>
parents:
diff changeset
292 import ./thirdparty/winim/winim/inc/winbase
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sam <sam@basx.dev>
parents:
diff changeset
293 when defined(linux):
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sam <sam@basx.dev>
parents:
diff changeset
294 import std/posix
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sam <sam@basx.dev>
parents:
diff changeset
295
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sam <sam@basx.dev>
parents:
diff changeset
296 proc StartMixerThread() =
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sam <sam@basx.dev>
parents:
diff changeset
297 mixer[] = initMixer()
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sam <sam@basx.dev>
parents:
diff changeset
298 audiothread.createThread(audioWorker)
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sam <sam@basx.dev>
parents:
diff changeset
299 debug "Created audio thread"
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sam <sam@basx.dev>
parents:
diff changeset
300 when defined(windows):
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sam <sam@basx.dev>
parents:
diff changeset
301 SetThreadPriority(audiothread.handle(), THREAD_PRIORITY_TIME_CRITICAL)
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sam <sam@basx.dev>
parents:
diff changeset
302 when defined(linux):
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sam <sam@basx.dev>
parents:
diff changeset
303 discard pthread_setschedprio(Pthread(audiothread.handle()), cint(-20))