Mercurial > games > semicongine

annotate semiconginev2/old/audio.nim @ 1221:000befd9479f compiletime-tests

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did: remove support for git, for now
author sam <sam@basx.dev>
date Wed, 17 Jul 2024 21:05:47 +0700
parents 56781cc0fc7c
children
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diff changeset
1 import std/monotimes
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2 import std/strformat
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3 import std/times
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4 import std/tables
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5 import std/locks
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6 import std/logging except Level
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7
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8 when defined(windows): # used for setting audio thread priority
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9 import winim except Level
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10 when defined(linux):
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11 import std/posix
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12
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13 import ./core
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14 import ./platform/audio
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15 import ./resources
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16
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17 export audiotypes
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18
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19 const NBUFFERS = 32
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20 const BUFFERSAMPLECOUNT = 256
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21
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22 type
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23 Playback = object
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24 sound: Sound
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25 position: int
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26 loop: bool
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27 levelLeft: Level
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28 levelRight: Level
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29 paused: bool
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30 Track = object
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31 playing: Table[uint64, Playback]
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32 level: Level
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33 targetLevel: Level
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34 fadeTime: float
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35 fadeStep: float
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36 Mixer* = object
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37 playbackCounter: uint64
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38 tracks: Table[string, Track]
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39 sounds*: Table[string, Sound]
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40 level: Level
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41 device: NativeSoundDevice
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42 lock: Lock
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43 buffers: seq[SoundData]
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44 currentBuffer: int
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45 lastUpdate: MonoTime
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46
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47 proc initMixer(): Mixer =
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48 result = Mixer(
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49 tracks: {"": Track(level: 1'f)}.toTable,
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50 level: 1'f,
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51 )
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52 result.lock.initLock()
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53
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54 proc setupDevice(mixer: var Mixer) =
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55 # call this inside audio thread
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56 var bufferaddresses: seq[ptr SoundData]
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57 for i in 0 ..< NBUFFERS:
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58 mixer.buffers.add newSeq[Sample](BUFFERSAMPLECOUNT)
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59 for i in 0 ..< mixer.buffers.len:
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60 bufferaddresses.add (addr mixer.buffers[i])
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61 mixer.device = OpenSoundDevice(AUDIO_SAMPLE_RATE, bufferaddresses)
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63 proc LoadSound*(mixer: var Mixer, name: string, resource: string) =
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64 assert not (name in mixer.sounds)
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65 mixer.sounds[name] = LoadAudio(resource)
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66
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67 proc AddSound*(mixer: var Mixer, name: string, sound: Sound) =
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68 assert not (name in mixer.sounds)
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69 mixer.sounds[name] = sound
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70
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71 proc ReplaceSound*(mixer: var Mixer, name: string, sound: Sound) =
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72 assert (name in mixer.sounds)
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73 mixer.sounds[name] = sound
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74
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75 proc AddTrack*(mixer: var Mixer, name: string, level: Level = 1'f) =
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76 assert not (name in mixer.tracks)
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77 mixer.lock.withLock():
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78 mixer.tracks[name] = Track(level: level)
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79
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80 proc Play*(mixer: var Mixer, soundName: string, track = "", stopOtherSounds = false, loop = false, levelLeft, levelRight: Level): uint64 =
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81 assert track in mixer.tracks, &"Track '{track}' does not exists"
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82 assert soundName in mixer.sounds, soundName & " not loaded"
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83 mixer.lock.withLock():
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84 if stopOtherSounds:
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85 mixer.tracks[track].playing.clear()
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86 mixer.tracks[track].playing[mixer.playbackCounter] = Playback(
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87 sound: mixer.sounds[soundName],
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88 position: 0,
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89 loop: loop,
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90 levelLeft: levelLeft,
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91 levelRight: levelRight,
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92 paused: false,
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93 )
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94 result = mixer.playbackCounter
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95 inc mixer.playbackCounter
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96
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97 proc Play*(mixer: var Mixer, soundName: string, track = "", stopOtherSounds = false, loop = false, level: Level = 1'f): uint64 =
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98 Play(
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99 mixer = mixer,
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100 soundName = soundName,
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101 track = track,
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102 stopOtherSounds = stopOtherSounds,
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103 loop = loop,
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104 levelLeft = level,
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105 levelRight = level
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106 )
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107
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108 proc Stop*(mixer: var Mixer) =
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109 mixer.lock.withLock():
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110 for track in mixer.tracks.mvalues:
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111 track.playing.clear()
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112
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113 proc GetLevel*(mixer: var Mixer): Level = mixer.level
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114 proc GetLevel*(mixer: var Mixer, track: string): Level = mixer.tracks[track].level
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115 proc GetLevel*(mixer: var Mixer, playbackId: uint64): (Level, Level) =
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116 for track in mixer.tracks.mvalues:
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117 if playbackId in track.playing:
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118 return (track.playing[playbackId].levelLeft, track.playing[playbackId].levelRight)
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119
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120 proc SetLevel*(mixer: var Mixer, level: Level) = mixer.level = level
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121 proc SetLevel*(mixer: var Mixer, track: string, level: Level) =
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122 mixer.lock.withLock():
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123 mixer.tracks[track].level = level
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124 proc SetLevel*(mixer: var Mixer, playbackId: uint64, levelLeft, levelRight: Level) =
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125 mixer.lock.withLock():
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126 for track in mixer.tracks.mvalues:
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127 if playbackId in track.playing:
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128 track.playing[playbackId].levelLeft = levelLeft
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129 track.playing[playbackId].levelRight = levelRight
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130 proc SetLevel*(mixer: var Mixer, playbackId: uint64, level: Level) =
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131 SetLevel(mixer, playbackId, level, level)
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132
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133 proc Stop*(mixer: var Mixer, track: string) =
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134 assert track in mixer.tracks
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135 mixer.lock.withLock():
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136 mixer.tracks[track].playing.clear()
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137
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138 proc Stop*(mixer: var Mixer, playbackId: uint64) =
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139 mixer.lock.withLock():
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140 for track in mixer.tracks.mvalues:
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141 if playbackId in track.playing:
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142 track.playing.del(playbackId)
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143 break
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144
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145 proc Pause*(mixer: var Mixer, value: bool) =
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146 mixer.lock.withLock():
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147 for track in mixer.tracks.mvalues:
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148 for playback in 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, track: string, value: bool) =
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152 mixer.lock.withLock():
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153 for playback in mixer.tracks[track].playing.mvalues:
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154 playback.paused = value
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155
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156 proc Pause*(mixer: var Mixer, playbackId: uint64, value: bool) =
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157 mixer.lock.withLock():
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158 for track in mixer.tracks.mvalues:
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159 if playbackId in track.playing:
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160 track.playing[playbackId].paused = value
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161
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162 proc Pause*(mixer: var Mixer) = mixer.Pause(true)
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163 proc Pause*(mixer: var Mixer, track: string) = mixer.Pause(track, true)
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164 proc Pause*(mixer: var Mixer, playbackId: uint64) = mixer.Pause(playbackId, true)
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165 proc Unpause*(mixer: var Mixer) = mixer.Pause(false)
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166 proc Unpause*(mixer: var Mixer, track: string) = mixer.Pause(track, false)
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167 proc Unpause*(mixer: var Mixer, playbackId: uint64) = mixer.Pause(playbackId, false)
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168
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169 proc FadeTo*(mixer: var Mixer, track: string, level: Level, time: float) =
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170 mixer.tracks[track].targetLevel = level
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171 mixer.tracks[track].fadeTime = time
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172 mixer.tracks[track].fadeStep = level.float - mixer.tracks[track].level.float / time
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173
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174 proc IsPlaying*(mixer: var Mixer): bool =
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175 mixer.lock.withLock():
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176 for track in mixer.tracks.mvalues:
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177 for playback in track.playing.values:
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178 if not playback.paused:
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179 return true
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180 return false
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181
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182 proc IsPlaying*(mixer: var Mixer, track: string): bool =
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183 mixer.lock.withLock():
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184 if mixer.tracks.contains(track):
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185 for playback in mixer.tracks[track].playing.values:
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186 if not playback.paused:
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187 return true
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188 return false
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189
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190 func applyLevel(sample: Sample, levelLeft, levelRight: Level): Sample =
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191 [int16(float(sample[0]) * levelLeft), int16(float(sample[1]) * levelRight)]
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192
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193 func clip(value: int32): int16 =
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194 int16(max(min(int32(high(int16)), value), int32(low(int16))))
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195
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196 # used for combining sounds
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197 func mix(a, b: Sample): Sample =
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198 [
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199 clip(int32(a[0]) + int32(b[0])),
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200 clip(int32(a[1]) + int32(b[1])),
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201 ]
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202
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203 proc updateSoundBuffer(mixer: var Mixer) =
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204 let t = getMonoTime()
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205
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206 let tDebug = getTime()
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207 # echo ""
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208 # echo tDebug
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209
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210 let dt = (t - mixer.lastUpdate).inNanoseconds.float64 / 1_000_000_000'f64
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211 mixer.lastUpdate = t
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212
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213 # update fadings
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214 for track in mixer.tracks.mvalues:
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215 if track.fadeTime > 0:
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216 track.fadeTime -= dt
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217 track.level = (track.level.float64 + track.fadeStep.float64 * dt).clamp(Level.low, Level.high)
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218 if track.fadeTime <= 0:
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219 track.level = track.targetLevel
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220 # mix
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221 for i in 0 ..< mixer.buffers[mixer.currentBuffer].len:
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222 var mixedSample = [0'i16, 0'i16]
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223 mixer.lock.withLock():
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224 for track in mixer.tracks.mvalues:
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225 var stoppedSounds: seq[uint64]
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226 for (id, playback) in track.playing.mpairs:
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227 if playback.paused:
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228 continue
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229 let sample = applyLevel(
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230 playback.sound[][playback.position],
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231 mixer.level * track.level * playback.levelLeft,
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232 mixer.level * track.level * playback.levelRight,
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233 )
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234 mixedSample = mix(mixedSample, sample)
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235 inc playback.position
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236 if playback.position >= playback.sound[].len:
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237 if playback.loop:
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238 playback.position = 0
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239 else:
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240 stoppedSounds.add id
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241 for id in stoppedSounds:
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242 track.playing.del(id)
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243 mixer.buffers[mixer.currentBuffer][i] = mixedSample
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244 # send data to sound device
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245 # echo getTime() - tDebug
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246 mixer.device.WriteSoundData(mixer.currentBuffer)
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247 # echo getTime() - tDebug
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248 mixer.currentBuffer = (mixer.currentBuffer + 1) mod mixer.buffers.len
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249
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250 # DSP functions
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251 # TODO: finish implementation, one day
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252
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253 #[
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254 #
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255 proc lowPassFilter(data: var SoundData, cutoff: int) =
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256 let alpha = float(cutoff) / AUDIO_SAMPLE_RATE
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257 var value = data[0]
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258 for i in 0 ..< data.len:
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259 value[0] += int16(alpha * float(data[i][0] - value[0]))
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260 value[1] += int16(alpha * float(data[i][1] - value[1]))
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261 data[i] = value
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262
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263 proc downsample(data: var SoundData, n: int) =
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264 let newLen = (data.len - 1) div n + 1
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265 for i in 0 ..< newLen:
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266 data[i] = data[i * n]
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267 data.setLen(newLen)
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268
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269 proc upsample(data: var SoundData, m: int) =
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270 data.setLen(data.len * m)
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271 var i = data.len - 1
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272 while i < 0:
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273 if i mod m == 0:
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274 data[i] = data[i div m]
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275 else:
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276 data[i] = [0, 0]
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277 i.dec
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278
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279 proc slowdown(data: var SoundData, m, n: int) =
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280 data.upsample(m)
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281 # TODO
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282 # data.lowPassFilter(m)
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283 data.downsample(n)
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284
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285 ]#
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286
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287 proc destroy(mixer: var Mixer) =
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288 mixer.lock.deinitLock()
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289 mixer.device.CloseSoundDevice()
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290
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291 # Threaded implementation, usually used for audio
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292
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293 var
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294 mixer* = createShared(Mixer)
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295 audiothread: Thread[void]
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296
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297 proc audioWorker() {.thread.} =
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298 mixer[].setupDevice()
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299 onThreadDestruction(proc() = mixer[].lock.withLock(mixer[].destroy()); freeShared(mixer))
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300 while true:
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301 mixer[].updateSoundBuffer()
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302
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303 proc StartMixerThread*() =
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304 mixer[] = initMixer()
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305 audiothread.createThread(audioWorker)
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306 debug "Created audio thread"
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307 when defined(windows):
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308 SetThreadPriority(audiothread.handle(), THREAD_PRIORITY_TIME_CRITICAL)
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309 when defined(linux):
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310 discard pthread_setschedprio(Pthread(audiothread.handle()), cint(-20))