changelog.md

v0.10.2 - January 17, 2025

• Add Static/StreamingSoundData::unsliced_duration (thanks @Roms1383!)

v0.10.1 - January 8, 2025

• Fix spatial audio tracks immediately outputting non-spatialized audio if the corresponding listener is dropped. This could result in unexpectedly loud audio playback. Now if the listener is dropped, the spatial track will output silence.

v0.10 - January 1, 2025

Buffered audio

Kira now processes audio in chunks instead of one sample at a time. This means that Sound::process no longer returns a Frame; instead it receives a slice of Frames to overwrite. Effect::process takes an input slice instead of a single frame, and it overwrites that slice instead of returning a new Frame.

The benefit of this change is significantly improved performance. The criterion benchmarks aren't comparable to the ones in v0.9.x and earlier, but in my unscientific test, I can play about twice as many sounds on my PC without crackling.

There are some tradeoffs, but I think they're reasonable:

• Modulators are no longer sample accurate. Instead, they update once per internal processing chunk. Sounds and effects can interpolate between the previous and current modulator value using Parameter::interpolated_value to avoid discontinuities.
• Clocks are no longer sample accurate. For my use case which involves dynamically generating music, the default internal buffer size of 128 frames sounds almost exactly the same as sample-accurate clocks. You can adjust the internal buffer size to get the right tradeoff of performance vs. accuracy for your game. I have some ideas for how sample-accurate clocks could be implemented within the buffered architecture, so if you find yourself needing sample-accurate clocks, let me know!
• The delay effect can no longer have its delay time changed after the fact. If you know how to implement a delay that can smoothly change its delay time with the buffered architecture, please make a PR!

Hierarchical mixer

Sounds now live inside mixer tracks. Previously, to play a sound on a mixer track, you would use StaticSoundData/StreamingSoundData::output_destination. Now, you pass the sound to TrackHandle::play. Additionally, tracks can contain other tracks. Tracks can also route their outputs to send tracks, which are a separate concept now. This change enables the following feature:

Pausing and resuming mixer tracks

Mixer tracks can now be paused and resumed. Pausing a mixer track pauses all sounds playing on the track, as well as all child tracks.

Spatial audio overhaul

The concepts of spatial scenes and emitters have been removed, and listeners no longer output to a mixer track. Instead, mixer tracks can optionally have spatial properties, like position and spatialization strength. Sounds and child tracks on the track will have spatialization applied relative to a specified listener.

This release also adds Value::FromListenerDistance, which can be used to map sound and effect parameters to the distance between a spatial track and its corresponding listener.

Simplified volume and playback rate types

Previously, Volume was an enum with Amplitude and Decibels variants, and PlaybackRate was an enum with Factor and Semitones variants. There's a couple problems with this:

• It's unclear what scale a tween uses when tweening from one variant to another. For instance, if you tween a Volume::Amplitude to a Volume::Decibels with linear easing, is it linear in the amplitude domain or decibels?
• Amplitude isn't a good default representation for volume because it's not perceptually linear.

Now, everything that previously used Volume uses the simpler Decibels type, and PlaybackRate always contains a factor. (Semitones still exists as a separate type that implements Into<PlaybackRate>).

There's also a new Panning type that's used instead of bare f64s. Panning has been changed so -1.0 is left instead of 0.0, since this makes more sense mathematically.

Other changes

• Reorganized some types and modules to reduce unnecessary nesting
• Added WaitingToResume and Resuming variants to PlaybackState
• Changes to Mapping:
  • Added an easing field
  • Inputs are now always clamped to the input range
  • Removed the Default implementation
  • Added methods for performing math operations on the output range
• Implemented some math operations to Value
• Changed the fields of Capacities back to u64s
• ClockInfoProvider and ModulatorValueProvider and now combined into one Info struct, which also provides info about spatial audio state
• Added CpalBackend::pop_cpu_usage (desktop only for now)

v0.9.6 - November 10, 2024

• Improve performance when adding or subtracting large f64s from a ClockTime (thanks @crabm4n!)
• Fix UB detected by miri in the stacked borrows model (thanks @Imberflur!)

v0.9.5 - September 2, 2024

• Update glam to 0.29.0

v0.9.4 - August 8, 2024

• Fix bug where static sounds played backwards would never be marked as finished, and thus never unloaded
• Update triple_buffer to 8.0.0

v0.9.3 - June 15, 2024

• Update glam to 0.28.0

v0.9.2 - June 2, 2024

• Fix StaticSoundHandle/StreamingSoundHandle::pause/resume/stop not taking effect immediately if the sound has a start time. This was an unintended change from the behavior in v0.8.x and earlier versions.
• Fix sounds erroneously reporting their state as Playing before playback has resumed after calling StaticSoundHandle/StreamingSoundHandle::resume_at with a non-immediate StartTime
• Fix sounds entering a limbo state where they output no sound and can never be unloaded when their output destination (track or emitter) is removed
• Fix a bug where static sounds could enter a limbo state where they're stopped, but never unloaded if the clock they're waiting on is removed

v0.9.1 - May 31, 2024

• Fix sounds stopping after having already started if the clock they were originally waiting on stops
• Implement Default for Region, EndPosition, PlaybackPosition, and Value
• Implement Debug for handles, command types, and ResourceController

v0.9.0 - May 11, 2024

ClockTime::fraction

ClockTime now has a fraction field, which represents a fraction of a tick. This means sounds and tweens can be scheduled for times in-between ticks.

In addition, ClockHandle::fractional_position has been removed because ClockHandle::time provides that info anyway, and the shape of ClockInfo has changed to hold a ClockTime (this is only relevant if you're creating implementations of one of Kira's traits).

Added configuration for the CpalBackend

(Implemented by @zeozeozeo)

The device and buffer size used by the CpalBackend are now configurable via CpalBackendSettings.

Most param changes are now infallible

Anything that could previously fail because of a command buffer filling up or getting poisoned can no longer fail that way, so you can call functions like Emitter::set_position as frequently as you want.

Updated API for sound start positions and playback regions

v0.8 introduced a playback_region setting for static and streaming sounds which replaced the previous start_position setting. It was meant to serve two purposes:

• Allow you to play only a portion of a sound
• Allow setting the start position of the sound

However, these two purposes had an unintuitive interaction. Say you want to play a sound starting 3 seconds in. In v0.8, you would do something like this:

manager.play(
  StaticSoundData::from_file(
    "test.ogg",
    StaticSoundSettings::new().playback_region(3..),
  )?,
)?;

Then let's say you wanted to seek the sound to 2 seconds. The sound would stop because you've set the playback region not to include that part of the sound, when all you really wanted to do was set the start position.

In v0.9, these two purposes are separated. The playback_region setting has been reverted to the start_position setting from versions before v0.8, and to serve the purpose of playing portions of sounds, slice methods have been added to StaticSoundData and StreamingSoundData.

Note that the loop_region option added in v0.8 remains and works the same way in v0.9.

StartTime::delayed

Previously, you could delay the playback of a static sound by setting its start position to a negative number. This only worked with static sounds, however, not streaming sounds or tweens. This is now disallowed, which allows for some minor internal code cleanup. In its place is the more explicit and intuitive StartTime::delayed, which works with anything that has a StartTime.

Static/StreamingSoundHandle::resume_at

Previously, if you paused a sound and set the fade-in tween to have a start time in the future, the sound wouldn't become audible until the start time, but it would still be advancing in the background as soon as you called resume. The resume_at method delays playback until the specified StartTime.

Added settings methods to Static/StreamingSoundData

Chainable methods have been added to StaticSoundData and StreamingSoundData to change settings on the sound data. So instead of doing this:

let sound = StaticSoundData::from_file("sound.ogg", StaticSoundSettings::new()
  .volume(0.5)
  .playback_rate(2.0)
)?;

You can use this less verbose code:

let sound = StaticSoundData::from_file("sound.ogg")?
  .volume(0.5)
  .playback_rate(2.0);

StaticSoundSettings and StreamingSoundSettings still exist and are still fields of the corresponding SoundDatas, so you can still store settings independently of a sound data.

Resource capacities are now u16s

This allows for some performance improvements, but it does mean you are limited to 65,536 of each kind of resource (sounds, clocks, etc.). I apologize to anyone who was trying to play more than 65k sounds.

Remove AudioManager::pause/resume

This feature was thrown into a previous version of Kira as a quick and dirty way to pause/resume all sounds. However, it's the wrong tool for the job, since it pauses and resumes the entire audio system, which is almost never what you want.

Performance improvements

The benchmarks run about 26-29% faster (on my machine) compared to v0.8.7.

Other changes

• Added android_shared_stdcxx feature
• Update glam to 0.27
• Added TrackBuilder::add_built_effect and TrackBuilder::with_built_effect
• Improve performance when using start_position with streaming sounds
• Remove RangeInclusive conversions for Regions, as all current uses of Regions treat the end bound as exclusive
• Stop streaming sounds immediately if there's a decoding error
• Remove all uses of #[non_exhaustive]
• Add #[must_use] where appropriate
• Moved some types and modules to reduce excessive nesting
• AudioManager::main_track now returns &mut TrackHandle instead of TrackHandle

v0.8.7 - January 31, 2024

• Fix ClockInfoProvider having poor timing resolution

v0.8.6 - January 13, 2024

• Fix a typo in the readme
• Add StreamingSoundData::duration
• Make AudioManagers Sync if the backend is Sync
• Make the CpalBackend Sync on wasm targets
• Make the MockBackend Sync
• Update glam to v0.25.0

v0.8.5 - September 22, 2023

• Fix kira::spatial::scene::AddEmitterError not being publicly available
• Fix some typos in the documentation
• Add the assert_no_alloc feature
• Fix garbage audio getting sent to surround sound channels

v0.8.4 - June 19, 2023

• Add serde feature
• Implement PartialOrd for ClockTime
• Implement Default for Volume and PlaybackRate

v0.8.3 - May 28, 2023

This release removes reverse playback support for streaming sounds. There's pretty serious issues with garbled audio when streaming an mp3 or ogg file backwards, and based the initial investigation, these issues won't be trivial to fix. This feature may return in the future, but for now, you should not rely on it.

v0.8.2 - May 27, 2023

• Fix errors when streaming some ogg files

Known issues:

• Seeking can cause errors with short ogg files
• Reverse playback of ogg files results in garbled sound

v0.8.1 - May 26, 2023

• Added StaticSoundData::from_media_source
• Added StreamingSoundData::from_media_source

v0.8.0 - May 21, 2023

Spatial audio

The main highlight of this release: Kira now supports 3D positional audio! This is a simple implementation of 3D audio that only support volume attenuation based on distance and panning based on direction. Doppler effect and distance-based filtering and reverb are not supported yet.

This is meant to be an MVP of positional audio. Please give it a try and let me know what improvements you'd like to see so I can gauge what expansions to this API should look like.

Modulators

Modulators are globally available streams of values that parameters like volume and playback rate can be linked to. These are useful for controlling multiple parameters with one value and using more complex modulations, like LFOs.

For anyone who's made implementations of traits in previous versions of Kira, keep in mind that Tweener was renamed to Parameter, and now Tweener is the name of a modulator implementation that comes with Kira.

New effects

Two new effects were added: compressor and EQ filter. The compressor adjusts the volume of audio to make louder parts quieter. An EQ filter a single band of a parametric EQ useful for adjusting the volume of frequencies of sound.

Playback region/loop region settings

The start_position setting for static and streaming sounds has been replaced with a playback_region setting which lets you specify an end position for the sound as well as a start position. The loop_behavior setting has been replaced with loop_region, which lets you specify an end point for the loop. You can now change the loop_region after the sound is created using the set_loop_region function on the sound's handle.

Other changes

• StaticSoundData::frames is now an Arc<[Frame]> instead of Arc<Vec<Frame>>
• Exposed the Decoder trait for streaming sounds
• Moved PlaybackState to the sound module
• Streaming sounds now support reverse playback
• Added TrackBuilder::with_effect
• Moved ClockSpeed to the clock module
• Moved PlaybackRate to the sound module

v0.7.3 - March 18, 2023

• Fix compile error on WASM targets

v0.7.2 - March 18, 2023

• Fix crackling on Mac OS when multiple applications are playing audio
• Update cpal to 0.15.1

v0.7.1 - October 23, 2022

• Update cpal to 0.14.1
• Update ringbuf to 0.3.1
• Implement PartialEq for StaticSoundData, DistortionKind, DistortionBuilder, FilterMode, FilterBuilder, PanningControlBuilder, ReverbBuilder, VolumeControlBuilder, and TrackRoutes
• Implement Debug for StaticSoundData and TrackRoutes
• Implement Clone for TrackRoutes

v0.7.0 - August 20th, 2022

This is a bugfix release, but unfortunately one of the bugfixes did require a breaking change. Fortunately, this breaking change only affects people who have created their own Sound or Effect implementations, which is not the most common use case.

Fixes:

• Fix a panic when starting a StaticSound with a start position later than the end of the sound
• Fix negative start positions getting rounded up to 0.0. Now sounds played with negative start positions will output silence until the position reaches 0.0, at which point normal playback will resume. This is the behavior from versions 0.5.x and prior, and it was not meant to change in 0.6.x.
• Streaming sounds will no longer stop after they encounter an error, allowing them to recover from non-fatal errors and continue playback
• Fix a bug where if a sound was played with the start time set to a clock time, and the clock time had already passed by the time the sound was played, it would not start until the next tick of that clock

Breaking changes (only for Sound and Effect implementations):

• Removed the on_clock_tick callback from Sound, Effect, and Tweener
• Instead, Sound::process, Effect::process, and Tweener::update receive a &ClockInfoProvider argument. ClockInfoProvider can report the current state of any active clock.

v0.6.1 - August 12th, 2022

• Added ClockHandle::fractional_position
• Added StaticSoundData::with_settings and StaticSoundData::with_modified_settings
• Changed the following functions to take &self arguments instead of &mut self (thanks @nobbele!):
  • ClockHandle::set_speed
  • ClockHandle::start
  • ClockHandle::pause
  • ClockHandle::stop
  • AudioManager::pause
  • AudioManager::resume
  • TrackHandle::set_volume
  • TrackHandle::set_route

v0.6.0 - March 7th, 2022

Kira v0.6 is a complete rewrite of Kira with the following goals:

• Make the API more elegant
• Make the library leaner by removing features that weren't pulling their weight
• Provide a solid technical foundation for future feature development

Of course, the overall goals of Kira are the same: provide a library that fills missing niches in most audio libraries and enables people to be creative with their game audio.

Streaming sounds

Kira now supports streaming sounds! Unlike static sounds, which keep all audio data in memory, streaming sounds decode audio from the filesystem in realtime. This has a much leaner memory footprint at the cost of higher CPU usage.

The Sound trait

Static and streaming sounds are both implementors of the new Sound trait. Sounds produce arbitrary streams of audio, so they can be used for both finite sounds or infinite sounds, like voice chat audio. In this sense, they're similar to AudioStreams from previous versions of Kira, but they can be automatically unloaded when they're finished, and they can receive clock events (see below). They're better integrated with the rest of Kira, making them first class citizens instead of escape hatches.

Kira no longer has any concept of "instances". If you want to play a static sound multiple times, you can clone it each time you want to pass it to AudioManager::play. (Static sounds share their samples via an Arc, so cloning is cheap.) Streaming sounds cannot be cloned since each one opens up a new file handle.

Clocks

Metronomes and sequences from previous versions of Kira were useful for complex audio scripting, but most games don't need such a complex system. In Kira v0.6, they're both replaced by clocks, which are simple timing sources.

Static and streaming sounds can be set to start playing at a certain clock time. Additionally, tweens can be set to start at a clock time. This means anything involving a tween, such as fading out a sound or changing its playback rate, can be synced to a clock.

If you need a more complex system, you should be able to build it in gameplay code using clocks as a building block.

More flexible mixer routing

The mixer no longer makes a distinction between sub-tracks and send tracks. Any sub-track can be routed to any number of other sub-tracks.

Modular backends

Previous versions of Kira were hardcoded to use cpal to talk to the operation system's audio drivers. Kira v0.6.0 has a Backend trait, so you can implement your own backends.

More permissive licensing

Kira is now available under the MIT or Apache-2.0 license. (Previous versions were only available under MIT.)

Feature removals

Parameters

Previous versions of Kira had global "parameters" that you could link settings to, like metronome tempos and instance playback rates. The only way to smoothly tween a setting was to link it to a parameter and tween that parameter. It is useful to be able to link multiple settings to one parameter, but the more common use case was to create a parameter just to tween one setting, which isn't very ergonomic.

In Kira v0.6, parameters have been removed, and all settings can be tweened directly. In future versions, I'd like to bring back global parameters and allow users to either tween settings directly or link them to parameters, I just haven't figured out a good way to architect that.

Arrangements

The main purpose of arrangements was to make it easier to create looping music with intro sections. It served that purpose well, but it was overkill for that purpose, and it wouldn't work with streaming sounds.

Groups

Groups were meant to help with pausing, resuming, stopping, and unloading large categories of resources. It tried to cover different types of resources with different notions of pausing, resuming, and stopping. It mapped decently to instances and sequences, but I think it would have been likely that future versions of Kira would have a resource type that groups didn't make sense for, and the abstraction would become shakier over time. Furthermore, resource management can be done from gameplay code, so it's not even necessary for Kira to provide this feature.

Changes since v0.6.0 beta 6

• Added volume control and panning control effects
• Removed the built-in panning control from mixer tracks

v0.6.0 beta 6 - March 5th, 2022

• Moved the functionality from kira-cpal and kira-loaders into the main kira crate. kira-cpal and kira-loaders are now unneeded and deprecated.
  • CpalBackend from kira-cpal is now available as kira::manager::backend::cpal::CpalBackend
  • kira_loaders::load and kira_loaders::load_from_cursor are now StaticSoundData::from_file and StaticSoundData::from_cursor
  • kira_loaders::stream and kira_loaders::stream_from_cursor are now StreamingSoundData::from_file and StreamingSoundData::from_cursor
• Added Renderer::on_change_sample_rate, which the Backend should call if the audio sample rate changes
• Added Effect::on_change_sample_rate, which is called when the audio sample rate changes
• Changes to the Backend trait:
  • Added the associated type Backend::settings and the method Backend::setup, which is used for creating Backends (basically a new function, but required by the Backend trait)
  • Renamed Backend::init to Backend::start
  • Removed Backend::sample_rate
  • Removed UnusedResourceCollector from the public API. Backends are no longer responsible for dropping unused resources.
• Updated MockBackend to the new API
• Removed the backend argument to AudioManager::new
• Restructured AudioManagerSettings
• The cpal backend will now do its best to gracefully handle device disconnection and sample rate changes
• The cpal backend now works in wasm environments

v0.6.0 beta 5 - January 17, 2022

• Fix static sounds not pausing/resuming/stopping immediately when playback is waiting for a clock tick
• Remove From<f64> implementation for ClockSpeed
• Change AudioManager::add_clock to take a ClockSpeed argument instead of an impl Into<ClockSpeed> argument

v0.6.0 beta 4 - January 6, 2022

• Fix clocks not resetting their fractional position when stopped

v0.6.0 beta 3 - January 4, 2022

• Fix clock tick 0 occurring one tick after the clock is started instead of immediately when the clock is started
• Fix static sound pause/resume/stop fades never starting when the start time is set to a clock time

v0.6.0 beta 2 - January 3, 2022

• Remove Clock and Clocks from the public API
• Sounds and effects now have an on_clock_tick callback instead of having a &Clocks argument passed into process
• Remove parameters
• Settings that were previously Values can now be tweened directly without needing to link them to a parameter
• All functions that send commands to the renderer now use CommandError as their error type
• Effects now have a similar structure to sounds
  • EffectBuilder - trait for types that can be converted to an Effect and a handle
  • Effect - runs on the renderer
• TrackSettings is now TrackBuilder. Effects can be added by passing an EffectBuilder to TrackBuilder::add_effect.
• Changes to the built-in effects:
  • Removed Distortion from the public API, DistortionSettings is now DistortionBuilder, added DistortionHandle
  • Removed Delay from the public API, DelaySettings is now DelayBuilder, added DelayHandle
  • Removed Reverb from the public API, ReverbSettings is now ReverbBuilder, added ReverbHandle
  • Removed Filter from the public API, FilterSettings is now FilterBuilder, added FilterHandle
• Renamed Tweenable to Tweener
• Added a Tweenable trait for things that a Tweener can control. Tweener is now generic over the type of the Tweenable value
• Volume settings now use the Volume type instead of f64
• Playback rate settings now use the PlaybackRate type instead of f64
• Clock speed settings now use the ClockSpeed type instead of f64
• Fix audio artifacts when a static sound loops
• Slight performance improvement when sounds are center-panned
• Allow configuring the main mixer track using a TrackBuilder in AudioManagerSettings

v0.6.0 beta 1 - December 24, 2021

• Fix looping static sounds with a loop start position greater than 0.0 starting playback at that position. (The intended behavior is that the sound will still start at the beginning, but jump back to the loop start position after reaching the end.)

v0.6.0 beta 0 - December 4, 2021

Complete rewrite, most things have changed

v0.5.3 - May 31, 2021

• Fix an issue where the AudioManager cleanup would fail if there are existing track handles

v0.5.2 - April 27, 2021

• Added Sound::from_mp3_reader, Sound::from_ogg_reader, Sound::from_flac_reader, and Sound::from_wav_reader (thanks @Zicklag!)
• (Hopefully) fixed an issue where capacities (the maximum number of instances, sequences, etc.) could decrease over time

v0.5.1 - March 28, 2021

• Added a Default implementation for TrackSends
• Fixed a compile error when building Kira with the serde_support feature enabled

v0.5.0 - March 7, 2021

Additions

• Added send tracks, which you can route sub-tracks to in addition to their parent track. This is useful for sharing effects between multiple sub-tracks.
• Made the volume setting for Tracks a Value<f64>, which means you can link it to a parameter
• Added Main/Sub/SendTrackHandle::set_volume
• Added an init callback to the Effect trait
• Added new effects: Distortion, Delay, and Reverb
• Added a mix setting for effects, which lets you blend dry and wet signal
• Added InstanceHandle::position, which gets the current playback position of the instance
• Added CachedValue::with_valid_range for clamping values

Bugfixes

• The default filter cutoff is no longer outside of the range of human hearing

Other changes

• Changed settings structs with an id field to use Option<Id>. This eliminates a confusing situation where cloning the same settings struct and passing it to multiple objects results in each object overwriting the previous one since it has the same ID.
• Changes to errors related to sending commands to the audio thread:
  • Command-sending related errors are now listed in the CommandError enum
  • BackendDisconnected is no longer included in error enums
  • Handle structs whose only error variant was BackendDisconnected now return a CommandError
  • TrackHandleError was split into AddEffectError and RemoveEffectError
• MetronomeHandle.event_iter has been replaced with MetronomeHandle.pop_event, which works the same way as SequenceInstanceHandle.pop_event
• Changed all occurrences of the term "pitch" to "playback rate"

v0.4.1 - January 23, 2021

Added serde support for Arrangements and SoundClips

v0.4.0 - January 23, 2021

wasm32 support

Kira now runs on any platform supporting wasm32 and having a cpal backend. This means one can now run an instance of Kira in a web browser.

Handle-based API

The API has gone through a major revision. Previously, to do just about anything, you would have to use the AudioManager:

audio_manager.stop_instance(instance_id)?;
audio_manager.set_metronome_tempo(Tempo(128.0))?;
// etc...

This meant that you had to pass a reference to the audio manager to every part of the code that needs it. It also meant that the AudioManager struct had an overwhelming number of methods.

The API has been changed so that whenever you create a new thing (like a sound, an instance, or a mixer track), you receive a handle to that thing that you can use to control it.

let mut sound = audio_manager.load_sound("sound.ogg", SoundSettings::default())?;
let mut instance = sound.play(InstanceSettings::default())?;
instance.set_pitch(2.0)?;

Multiple metronomes

You can now create multiple metronomes. Each sequence instance can be assigned to a different metronome, and interval events can be received from a MetronomeHandle:

let mut metronome = audio_manager.add_metronome(
	MetronomeSettings::new().interval_events_to_emit([0.25, 0.5, 1.0]))?;
audio_manager.start_sequence({
	let mut sequence = Sequence::<()>::new(SequenceSettings::default());
	// sequence code
	sequence
}, SequenceInstanceSettings::new().metronome(&metronome))?;
metronome.start()?;
for interval in metronome.event_iter() {
	println!("{}", interval);
}

Most people will only need one metronome at a time - the main point of this is to move more functionality out of the AudioManager struct.

Serde support

Sequences and most config structs now have serialization/deserialization support via the serde_support feature.

Improved error handling

The capacity limits specified in AudioManagerSettings are now enforced, and the audio manager will also check that when you remove something with an ID, something with that ID actually exists. Because this creates a lot of new error variants, the large AudioError enum has been split up into smaller, situational error enums.

v0.3.0 - December 26th, 2020

Per-sequence custom event types

Previously, custom events emitted by sequences were retrieved by calling AudioManager::pop_event, which meant that the audio manager had a generic type parameter for custom events, and every sequence had to emit custom events of the same type.

Now, each sequence has its own custom event type, and you receive those events from an EventReceiver that the audio manager returns when you call AudioManager::add_sequence. This gives you more flexibility in how you organize your custom events as well as moving some functionality out of the AudioManager struct, which already has a lot of methods.

Audio streams

Audio streams provide a way of sending arbitrary audio data to the mixer. Sometimes, you need to play audio that you generate in real time, like voice chats. This feature lets you do that.

Groups

Sounds, arrangements, and sequences can now be grouped so that they can all be paused, resumed, or stopped at once. This is useful for controlling broad categories of sounds, like gameplay sounds or music.

Other changes

• Added Sequence::play_random
• Added Value::Random
• Renamed Sound::new to Sound::from_frames
• Audio file format decoding is now gated behind feature flags
• Changed functions for pausing, resuming, and stopping instances to take settings structs (PauseInstanceSettings, ResumeInstanceSettings, and StopInstanceSettings)
• When resuming an instance, you can now choose to have it seek backward to the time when it was paused. This is useful if you need to keep audio synced up with something in-game, but you still want a smooth fade out when pausing the game.
• Renamed Sequence::emit_custom_event to Sequence::emit
• Added AudioManager::seek_instance and AudioManager::seek_instance_to for changing the playback positions of running instances
• Refined the behavior of looping backwards instances
• Added Tween::linear
• Make Arrangement::settings private and add settings parameters to Arrangement::new_loop and Arrangement::new_loop_with_intro

v0.2.0 - December 6th, 2020

Arrangements

This release adds Arrangements, which allow you to stitch together multiple sounds into a larger sound that you can play instances of.

The main use case for this is setting up seamless loops, including looping songs with intros. The previous release could create seamless loops, but only if the sound didn't have an intro.

Functions that dealt with instances of sounds now deal with instances of sounds or arrangements. InstanceSettings has become PlayableSettings to correspond to the new Playable enum.

Arrangements also help reduce some complexity from the code for instances and make some more unusual behaviors, like playing instances backwards or rewinding instances (not implemented yet, but planned), easier to reason about.

I'm sure there's other good uses for arrangements, too! But I think the most common use case will be songs with intros.

Other changes

• Remove SoundMetadata and move semantic_duration into PlayableSettings
• Rename StereoSample to Frame
• Added support for panning instances:
  • Added Frame::panned
  • Added a panning field and method to InstanceSettings
  • Added AudioManager::set_instance_panning
  • Added Sequence::set_instance_panning
• Added parameter mappings, which allow Values to map to parameters with custom scaling and offsets. Value::Parameter now contains a Mapping as its second piece of data. ParameterIds can be converted into Value::Parameters with the default 1:1 mapping.
• Changed Tween to a C-style struct with named fields:
  • duration - the duration of the tween
  • easing - the easing function to use (linear, power, etc.)
  • ease_direction - the easing direction (in, out, in-out)
• Added chainable methods to more settings structs
• Replaced AudioManager::events with AudioManager::pop_event
• Add Sequence:pause/stop/resume_sequence
• Replace AudioError::SupportedStreamConfigsError with AudioError::DefaultStreamConfigError

v0.1.2 - December 4th, 2020

Changes:

• Update cpal to 0.13.1
• Fix a crash when using a mono output config
• Use the system's default output config instead of the config with the highest sample rate in the first valid range

v0.1.1 - November 18th, 2020

Changes:

• Fix readme path in Cargo.toml

v0.1.0 - November 18th, 2020

First public release