Mercurial > games > semicongine

annotate semiconginev2/audio/mixer.nim @ 1224:a3fa15c25026 compiletime-tests

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did: cleanup, add audio, change platform-dependent structure
author sam <sam@basx.dev>
date Wed, 17 Jul 2024 22:02:11 +0700
parents
children 841e12f33c47
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
1224
a3fa15c25026 did: cleanup, add audio, change platform-dependent structure
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1
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2 const NBUFFERS = 32
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3 const BUFFERSAMPLECOUNT = 256
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4 const AUDIO_SAMPLE_RATE* = 44100
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5
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6 type
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7 Level* = 0'f .. 1'f
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8 Sample* = array[2, int16]
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9 SoundData* = seq[Sample]
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10
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11 Playback = object
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12 sound: SoundData
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13 position: int
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14 loop: bool
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15 levelLeft: Level
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16 levelRight: Level
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17 paused: bool
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18 Track = object
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19 playing: Table[uint64, Playback]
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20 level: Level
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21 targetLevel: Level
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22 fadeTime: float
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23 fadeStep: float
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24
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25 when defined(windows):
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26 include ./platform/windows
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27 when defined(linux):
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28 include ./platform/linux
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29
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30 type
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31 Mixer* = object
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32 playbackCounter: uint64
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33 tracks: Table[string, Track]
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34 sounds*: Table[string, SoundData]
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35 level: Level
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36 device: NativeSoundDevice
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37 lock: Lock
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38 buffers: seq[SoundData]
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39 currentBuffer: int
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40 lastUpdate: MonoTime
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41
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42 proc initMixer(): Mixer =
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43 result = Mixer(
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44 tracks: {"": Track(level: 1'f)}.toTable,
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45 level: 1'f,
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46 )
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47 result.lock.initLock()
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48
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49 proc setupDevice(mixer: var Mixer) =
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50 # call this inside audio thread
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51 var bufferaddresses: seq[ptr SoundData]
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52 for i in 0 ..< NBUFFERS:
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53 mixer.buffers.add newSeq[Sample](BUFFERSAMPLECOUNT)
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54 for i in 0 ..< mixer.buffers.len:
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55 bufferaddresses.add (addr mixer.buffers[i])
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56 mixer.device = OpenSoundDevice(AUDIO_SAMPLE_RATE, bufferaddresses)
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57
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58 # TODO: this should probably be in the load-code-stuff
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59 # proc LoadSound*(mixer: var Mixer, name: string, resource: string) =
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60 # assert not (name in mixer.sounds)
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61 # mixer.sounds[name] = LoadAudio(resource)
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62
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63 proc AddSound*(mixer: var Mixer, name: string, sound: SoundData) =
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64 assert not (name in mixer.sounds)
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65 mixer.sounds[name] = sound
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66
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67 proc ReplaceSound*(mixer: var Mixer, name: string, sound: SoundData) =
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68 assert (name in mixer.sounds)
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69 mixer.sounds[name] = sound
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70
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71 proc AddTrack*(mixer: var Mixer, name: string, level: Level = 1'f) =
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72 assert not (name in mixer.tracks)
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73 mixer.lock.withLock():
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74 mixer.tracks[name] = Track(level: level)
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75
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76 proc Play*(mixer: var Mixer, soundName: string, track = "", stopOtherSounds = false, loop = false, levelLeft, levelRight: Level): uint64 =
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77 assert track in mixer.tracks, &"Track '{track}' does not exists"
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78 assert soundName in mixer.sounds, soundName & " not loaded"
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79 mixer.lock.withLock():
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80 if stopOtherSounds:
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81 mixer.tracks[track].playing.clear()
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82 mixer.tracks[track].playing[mixer.playbackCounter] = Playback(
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83 sound: mixer.sounds[soundName],
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84 position: 0,
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85 loop: loop,
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86 levelLeft: levelLeft,
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87 levelRight: levelRight,
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88 paused: false,
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89 )
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90 result = mixer.playbackCounter
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91 inc mixer.playbackCounter
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92
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93 proc Play*(mixer: var Mixer, soundName: string, track = "", stopOtherSounds = false, loop = false, level: Level = 1'f): uint64 =
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94 Play(
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95 mixer = mixer,
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96 soundName = soundName,
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97 track = track,
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98 stopOtherSounds = stopOtherSounds,
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99 loop = loop,
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100 levelLeft = level,
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101 levelRight = level
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102 )
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103
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104 proc Stop*(mixer: var Mixer) =
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105 mixer.lock.withLock():
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106 for track in mixer.tracks.mvalues:
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107 track.playing.clear()
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108
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109 proc GetLevel*(mixer: var Mixer): Level = mixer.level
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110 proc GetLevel*(mixer: var Mixer, track: string): Level = mixer.tracks[track].level
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111 proc GetLevel*(mixer: var Mixer, playbackId: uint64): (Level, Level) =
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112 for track in mixer.tracks.mvalues:
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113 if playbackId in track.playing:
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114 return (track.playing[playbackId].levelLeft, track.playing[playbackId].levelRight)
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115
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116 proc SetLevel*(mixer: var Mixer, level: Level) = mixer.level = level
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117 proc SetLevel*(mixer: var Mixer, track: string, level: Level) =
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118 mixer.lock.withLock():
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119 mixer.tracks[track].level = level
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120 proc SetLevel*(mixer: var Mixer, playbackId: uint64, levelLeft, levelRight: Level) =
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121 mixer.lock.withLock():
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122 for track in mixer.tracks.mvalues:
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123 if playbackId in track.playing:
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124 track.playing[playbackId].levelLeft = levelLeft
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125 track.playing[playbackId].levelRight = levelRight
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126 proc SetLevel*(mixer: var Mixer, playbackId: uint64, level: Level) =
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127 SetLevel(mixer, playbackId, level, level)
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128
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129 proc Stop*(mixer: var Mixer, track: string) =
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130 assert track in mixer.tracks
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131 mixer.lock.withLock():
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132 mixer.tracks[track].playing.clear()
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133
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134 proc Stop*(mixer: var Mixer, playbackId: uint64) =
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135 mixer.lock.withLock():
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136 for track in mixer.tracks.mvalues:
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137 if playbackId in track.playing:
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138 track.playing.del(playbackId)
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139 break
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140
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141 proc Pause*(mixer: var Mixer, value: bool) =
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142 mixer.lock.withLock():
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143 for track in mixer.tracks.mvalues:
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144 for playback in track.playing.mvalues:
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145 playback.paused = value
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146
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147 proc Pause*(mixer: var Mixer, track: string, value: bool) =
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148 mixer.lock.withLock():
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149 for playback in mixer.tracks[track].playing.mvalues:
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150 playback.paused = value
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151
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152 proc Pause*(mixer: var Mixer, playbackId: uint64, value: bool) =
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diff changeset
153 mixer.lock.withLock():
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sam <sam@basx.dev>
parents:
diff changeset
154 for track in mixer.tracks.mvalues:
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sam <sam@basx.dev>
parents:
diff changeset
155 if playbackId in track.playing:
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sam <sam@basx.dev>
parents:
diff changeset
156 track.playing[playbackId].paused = value
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sam <sam@basx.dev>
parents:
diff changeset
157
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sam <sam@basx.dev>
parents:
diff changeset
158 proc Pause*(mixer: var Mixer) = mixer.Pause(true)
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sam <sam@basx.dev>
parents:
diff changeset
159 proc Pause*(mixer: var Mixer, track: string) = mixer.Pause(track, true)
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sam <sam@basx.dev>
parents:
diff changeset
160 proc Pause*(mixer: var Mixer, playbackId: uint64) = mixer.Pause(playbackId, true)
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sam <sam@basx.dev>
parents:
diff changeset
161 proc Unpause*(mixer: var Mixer) = mixer.Pause(false)
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sam <sam@basx.dev>
parents:
diff changeset
162 proc Unpause*(mixer: var Mixer, track: string) = mixer.Pause(track, false)
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sam <sam@basx.dev>
parents:
diff changeset
163 proc Unpause*(mixer: var Mixer, playbackId: uint64) = mixer.Pause(playbackId, false)
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sam <sam@basx.dev>
parents:
diff changeset
164
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sam <sam@basx.dev>
parents:
diff changeset
165 proc FadeTo*(mixer: var Mixer, track: string, level: Level, time: float) =
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sam <sam@basx.dev>
parents:
diff changeset
166 mixer.tracks[track].targetLevel = level
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sam <sam@basx.dev>
parents:
diff changeset
167 mixer.tracks[track].fadeTime = time
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sam <sam@basx.dev>
parents:
diff changeset
168 mixer.tracks[track].fadeStep = level.float - mixer.tracks[track].level.float / time
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sam <sam@basx.dev>
parents:
diff changeset
169
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sam <sam@basx.dev>
parents:
diff changeset
170 proc IsPlaying*(mixer: var Mixer): bool =
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sam <sam@basx.dev>
parents:
diff changeset
171 mixer.lock.withLock():
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sam <sam@basx.dev>
parents:
diff changeset
172 for track in mixer.tracks.mvalues:
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sam <sam@basx.dev>
parents:
diff changeset
173 for playback in track.playing.values:
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sam <sam@basx.dev>
parents:
diff changeset
174 if not playback.paused:
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sam <sam@basx.dev>
parents:
diff changeset
175 return true
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sam <sam@basx.dev>
parents:
diff changeset
176 return false
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sam <sam@basx.dev>
parents:
diff changeset
177
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sam <sam@basx.dev>
parents:
diff changeset
178 proc IsPlaying*(mixer: var Mixer, track: string): bool =
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sam <sam@basx.dev>
parents:
diff changeset
179 mixer.lock.withLock():
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sam <sam@basx.dev>
parents:
diff changeset
180 if mixer.tracks.contains(track):
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sam <sam@basx.dev>
parents:
diff changeset
181 for playback in mixer.tracks[track].playing.values:
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sam <sam@basx.dev>
parents:
diff changeset
182 if not playback.paused:
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sam <sam@basx.dev>
parents:
diff changeset
183 return true
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sam <sam@basx.dev>
parents:
diff changeset
184 return false
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sam <sam@basx.dev>
parents:
diff changeset
185
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sam <sam@basx.dev>
parents:
diff changeset
186 func applyLevel(sample: Sample, levelLeft, levelRight: Level): Sample =
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sam <sam@basx.dev>
parents:
diff changeset
187 [int16(float(sample[0]) * levelLeft), int16(float(sample[1]) * levelRight)]
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sam <sam@basx.dev>
parents:
diff changeset
188
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sam <sam@basx.dev>
parents:
diff changeset
189 func clip(value: int32): int16 =
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sam <sam@basx.dev>
parents:
diff changeset
190 int16(max(min(int32(high(int16)), value), int32(low(int16))))
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sam <sam@basx.dev>
parents:
diff changeset
191
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sam <sam@basx.dev>
parents:
diff changeset
192 # used for combining sounds
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sam <sam@basx.dev>
parents:
diff changeset
193 func mix(a, b: Sample): Sample =
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sam <sam@basx.dev>
parents:
diff changeset
194 [
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sam <sam@basx.dev>
parents:
diff changeset
195 clip(int32(a[0]) + int32(b[0])),
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sam <sam@basx.dev>
parents:
diff changeset
196 clip(int32(a[1]) + int32(b[1])),
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sam <sam@basx.dev>
parents:
diff changeset
197 ]
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sam <sam@basx.dev>
parents:
diff changeset
198
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sam <sam@basx.dev>
parents:
diff changeset
199 proc updateSoundBuffer(mixer: var Mixer) =
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sam <sam@basx.dev>
parents:
diff changeset
200 let t = getMonoTime()
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sam <sam@basx.dev>
parents:
diff changeset
201
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sam <sam@basx.dev>
parents:
diff changeset
202 let tDebug = getTime()
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sam <sam@basx.dev>
parents:
diff changeset
203 # echo ""
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sam <sam@basx.dev>
parents:
diff changeset
204 # echo tDebug
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sam <sam@basx.dev>
parents:
diff changeset
205
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sam <sam@basx.dev>
parents:
diff changeset
206 let dt = (t - mixer.lastUpdate).inNanoseconds.float64 / 1_000_000_000'f64
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sam <sam@basx.dev>
parents:
diff changeset
207 mixer.lastUpdate = t
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sam <sam@basx.dev>
parents:
diff changeset
208
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sam <sam@basx.dev>
parents:
diff changeset
209 # update fadings
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sam <sam@basx.dev>
parents:
diff changeset
210 for track in mixer.tracks.mvalues:
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sam <sam@basx.dev>
parents:
diff changeset
211 if track.fadeTime > 0:
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sam <sam@basx.dev>
parents:
diff changeset
212 track.fadeTime -= dt
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sam <sam@basx.dev>
parents:
diff changeset
213 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
214 if track.fadeTime <= 0:
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sam <sam@basx.dev>
parents:
diff changeset
215 track.level = track.targetLevel
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sam <sam@basx.dev>
parents:
diff changeset
216 # mix
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sam <sam@basx.dev>
parents:
diff changeset
217 for i in 0 ..< mixer.buffers[mixer.currentBuffer].len:
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sam <sam@basx.dev>
parents:
diff changeset
218 var mixedSample = [0'i16, 0'i16]
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sam <sam@basx.dev>
parents:
diff changeset
219 mixer.lock.withLock():
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sam <sam@basx.dev>
parents:
diff changeset
220 for track in mixer.tracks.mvalues:
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sam <sam@basx.dev>
parents:
diff changeset
221 var stoppedSounds: seq[uint64]
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sam <sam@basx.dev>
parents:
diff changeset
222 for (id, playback) in track.playing.mpairs:
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sam <sam@basx.dev>
parents:
diff changeset
223 if playback.paused:
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sam <sam@basx.dev>
parents:
diff changeset
224 continue
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sam <sam@basx.dev>
parents:
diff changeset
225 let sample = applyLevel(
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sam <sam@basx.dev>
parents:
diff changeset
226 playback.sound[playback.position],
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sam <sam@basx.dev>
parents:
diff changeset
227 mixer.level * track.level * playback.levelLeft,
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sam <sam@basx.dev>
parents:
diff changeset
228 mixer.level * track.level * playback.levelRight,
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sam <sam@basx.dev>
parents:
diff changeset
229 )
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sam <sam@basx.dev>
parents:
diff changeset
230 mixedSample = mix(mixedSample, sample)
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sam <sam@basx.dev>
parents:
diff changeset
231 inc playback.position
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sam <sam@basx.dev>
parents:
diff changeset
232 if playback.position >= playback.sound.len:
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sam <sam@basx.dev>
parents:
diff changeset
233 if playback.loop:
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sam <sam@basx.dev>
parents:
diff changeset
234 playback.position = 0
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sam <sam@basx.dev>
parents:
diff changeset
235 else:
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sam <sam@basx.dev>
parents:
diff changeset
236 stoppedSounds.add id
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sam <sam@basx.dev>
parents:
diff changeset
237 for id in stoppedSounds:
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sam <sam@basx.dev>
parents:
diff changeset
238 track.playing.del(id)
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sam <sam@basx.dev>
parents:
diff changeset
239 mixer.buffers[mixer.currentBuffer][i] = mixedSample
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sam <sam@basx.dev>
parents:
diff changeset
240 # send data to sound device
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sam <sam@basx.dev>
parents:
diff changeset
241 # echo getTime() - tDebug
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sam <sam@basx.dev>
parents:
diff changeset
242 mixer.device.WriteSoundData(mixer.currentBuffer)
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sam <sam@basx.dev>
parents:
diff changeset
243 # echo getTime() - tDebug
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sam <sam@basx.dev>
parents:
diff changeset
244 mixer.currentBuffer = (mixer.currentBuffer + 1) mod mixer.buffers.len
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sam <sam@basx.dev>
parents:
diff changeset
245
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sam <sam@basx.dev>
parents:
diff changeset
246 # DSP functions
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sam <sam@basx.dev>
parents:
diff changeset
247 # TODO: finish implementation, one day
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sam <sam@basx.dev>
parents:
diff changeset
248
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sam <sam@basx.dev>
parents:
diff changeset
249 #[
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sam <sam@basx.dev>
parents:
diff changeset
250 #
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sam <sam@basx.dev>
parents:
diff changeset
251 proc lowPassFilter(data: var SoundData, cutoff: int) =
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sam <sam@basx.dev>
parents:
diff changeset
252 let alpha = float(cutoff) / AUDIO_SAMPLE_RATE
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sam <sam@basx.dev>
parents:
diff changeset
253 var value = data[0]
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sam <sam@basx.dev>
parents:
diff changeset
254 for i in 0 ..< data.len:
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sam <sam@basx.dev>
parents:
diff changeset
255 value[0] += int16(alpha * float(data[i][0] - value[0]))
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sam <sam@basx.dev>
parents:
diff changeset
256 value[1] += int16(alpha * float(data[i][1] - value[1]))
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sam <sam@basx.dev>
parents:
diff changeset
257 data[i] = value
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sam <sam@basx.dev>
parents:
diff changeset
258
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sam <sam@basx.dev>
parents:
diff changeset
259 proc downsample(data: var SoundData, n: int) =
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sam <sam@basx.dev>
parents:
diff changeset
260 let newLen = (data.len - 1) div n + 1
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sam <sam@basx.dev>
parents:
diff changeset
261 for i in 0 ..< newLen:
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sam <sam@basx.dev>
parents:
diff changeset
262 data[i] = data[i * n]
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sam <sam@basx.dev>
parents:
diff changeset
263 data.setLen(newLen)
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sam <sam@basx.dev>
parents:
diff changeset
264
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sam <sam@basx.dev>
parents:
diff changeset
265 proc upsample(data: var SoundData, m: int) =
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sam <sam@basx.dev>
parents:
diff changeset
266 data.setLen(data.len * m)
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sam <sam@basx.dev>
parents:
diff changeset
267 var i = data.len - 1
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sam <sam@basx.dev>
parents:
diff changeset
268 while i < 0:
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sam <sam@basx.dev>
parents:
diff changeset
269 if i mod m == 0:
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sam <sam@basx.dev>
parents:
diff changeset
270 data[i] = data[i div m]
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sam <sam@basx.dev>
parents:
diff changeset
271 else:
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sam <sam@basx.dev>
parents:
diff changeset
272 data[i] = [0, 0]
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sam <sam@basx.dev>
parents:
diff changeset
273 i.dec
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sam <sam@basx.dev>
parents:
diff changeset
274
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sam <sam@basx.dev>
parents:
diff changeset
275 proc slowdown(data: var SoundData, m, n: int) =
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sam <sam@basx.dev>
parents:
diff changeset
276 data.upsample(m)
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sam <sam@basx.dev>
parents:
diff changeset
277 # TODO
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sam <sam@basx.dev>
parents:
diff changeset
278 # data.lowPassFilter(m)
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sam <sam@basx.dev>
parents:
diff changeset
279 data.downsample(n)
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sam <sam@basx.dev>
parents:
diff changeset
280
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sam <sam@basx.dev>
parents:
diff changeset
281 ]#
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sam <sam@basx.dev>
parents:
diff changeset
282
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sam <sam@basx.dev>
parents:
diff changeset
283 proc destroy(mixer: var Mixer) =
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sam <sam@basx.dev>
parents:
diff changeset
284 mixer.lock.deinitLock()
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sam <sam@basx.dev>
parents:
diff changeset
285 mixer.device.CloseSoundDevice()
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sam <sam@basx.dev>
parents:
diff changeset
286
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sam <sam@basx.dev>
parents:
diff changeset
287 var
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sam <sam@basx.dev>
parents:
diff changeset
288 mixer* = createShared(Mixer)
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sam <sam@basx.dev>
parents:
diff changeset
289 audiothread: Thread[void]
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sam <sam@basx.dev>
parents:
diff changeset
290
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sam <sam@basx.dev>
parents:
diff changeset
291 proc audioWorker() {.thread.} =
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sam <sam@basx.dev>
parents:
diff changeset
292 mixer[].setupDevice()
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sam <sam@basx.dev>
parents:
diff changeset
293 onThreadDestruction(proc() = mixer[].lock.withLock(mixer[].destroy()); freeShared(mixer))
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sam <sam@basx.dev>
parents:
diff changeset
294 while true:
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sam <sam@basx.dev>
parents:
diff changeset
295 mixer[].updateSoundBuffer()
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sam <sam@basx.dev>
parents:
diff changeset
296
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sam <sam@basx.dev>
parents:
diff changeset
297 # for thread priority (really necessary?)
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sam <sam@basx.dev>
parents:
diff changeset
298 when defined(windows):
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sam <sam@basx.dev>
parents:
diff changeset
299 import ./thirdparty/winim/winim/inc/winbase
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sam <sam@basx.dev>
parents:
diff changeset
300 when defined(linux):
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sam <sam@basx.dev>
parents:
diff changeset
301 import std/posix
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sam <sam@basx.dev>
parents:
diff changeset
302
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sam <sam@basx.dev>
parents:
diff changeset
303 proc StartMixerThread() =
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sam <sam@basx.dev>
parents:
diff changeset
304 mixer[] = initMixer()
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sam <sam@basx.dev>
parents:
diff changeset
305 audiothread.createThread(audioWorker)
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sam <sam@basx.dev>
parents:
diff changeset
306 debug "Created audio thread"
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sam <sam@basx.dev>
parents:
diff changeset
307 when defined(windows):
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sam <sam@basx.dev>
parents:
diff changeset
308 SetThreadPriority(audiothread.handle(), THREAD_PRIORITY_TIME_CRITICAL)
a3fa15c25026 did: cleanup, add audio, change platform-dependent structure
sam <sam@basx.dev>
parents:
diff changeset
309 when defined(linux):
a3fa15c25026 did: cleanup, add audio, change platform-dependent structure
sam <sam@basx.dev>
parents:
diff changeset
310 discard pthread_setschedprio(Pthread(audiothread.handle()), cint(-20))