librespot/CHANGELOG.md

# Changelog

All notable changes to this project will be documented in this file.

The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html) since v0.2.0.

## [0.5.0-dev] - YYYY-MM-DD

This version will be a major departure from the architecture up until now. It
focuses on implementing the "new Spotify API". This  means moving large parts
of the Spotify protocol from Mercury to HTTP. A lot of this was reverse
engineered before by @devgianlu of librespot-java. It was long overdue that we
started implementing it too, not in the least because new features like the
hopefully upcoming Spotify HiFi depend on it.

Splitting up the work on the new Spotify API, v0.5.0 brings HTTP-based file
downloads and metadata access. Implementing the "dealer" (replacing the current
Mercury-based SPIRC message bus with WebSockets, also required for social plays)
is separate large effort, to be targeted for v0.6.0.

While at it, we are taking the liberty to do some major refactoring to make
librespot more robust. Consequently not only the Spotify API changed but large
parts of the librespot API too. For downstream maintainers, we realise that it
can be a lot to move from the current codebase to this one, but believe us it
will be well worth it.

All these changes are likely to introduce new bugs as well as some regressions.
We appreciate all your testing and contributions to the repository:
https://github.com/librespot-org/librespot

### Changed

- [all] Assertions were changed into `Result` or removed (breaking)
- [all] Purge use of `unwrap`, `expect` and return `Result`
- [all] `chrono` replaced with `time` (breaking)
- [all] `time` updated (CVE-2020-26235)
- [all] Improve lock contention and performance (breaking)
- [audio] Files are now downloaded over the HTTPS CDN (breaking)
- [audio] Improve file opening and seeking performance
- [chore] MSRV is now 1.61
- [connect] `DeviceType` moved out of `connect` into `core` (breaking)
- [core] Message listeners are registered before authenticating. As a result
  there now is a separate `Session::new` and subsequent `session.connect`.
  (breaking)
- [core] `ConnectConfig` moved out of `core` into `connect` (breaking)
- [core] `client_id` for `get_token` moved to `SessionConfig` (breaking)
- [core] Mercury code has been refactored for better legibility (breaking)
- [core] Cache resolved access points during runtime (breaking)
- [core] `FileId` is moved out of `SpotifyId`. For now it will be re-exported.
- [core] Report actual platform data on login
- [playback] The audio decoder has been switched from `lewton` to `Symphonia`.
  This improves the Vorbis sound quality, adds support for MP3 as well as for
  FLAC in the future. (breaking)
- [playback] Improve reporting of actual playback cursor
- [playback] The passthrough decoder is now feature-gated (breaking)
- [playback] `rodio`: call play and pause
- [protocol] protobufs have been updated
- [metadata] Most metadata is now retrieved with the `spclient` (breaking)
- [metadata] Playlists are moved to the `playlist4_external` protobuf (breaking)

### Added

- [all] Check that array indexes are within bounds (panic safety)
- [all] Wrap errors in librespot `Error` type (breaking)
- [core] Send metrics with metadata queries: client ID, country & product
- [core] Verify Spotify server certificates (prevents man-in-the-middle attacks)
- [core] User attributes are stored in `Session` upon login, accessible with a
  getter and setter, and automatically updated as changes are pushed by the
  Spotify infrastructure (breaking)
- [core] HTTPS is now supported, including for proxies (breaking)
- [core] Resolve `spclient` and `dealer` access points (breaking)
- [core] Get and cache tokens through new token provider (breaking)
- [core] `spclient` is the API for HTTP-based calls to the Spotify servers.
  It supports a lot of functionality, including audio previews and image
  downloads even if librespot doesn't use that for playback itself.
- [core] Support downloading of lyrics
- [playback] Explicit tracks are skipped if the controlling Connect client has
  disabled such content. Applications that use librespot as a library without
  Connect should use the 'filter-explicit-content' user attribute in the session.
- [metadata] All metadata fields in the protobufs are now exposed (breaking)

### Fixed

### Removed

- [main] `autoplay` is no longer a command-line option. Instead, librespot now
  follows the setting in the Connect client that controls it. Applications that
  use librespot as a library without Connect should now instead use the
  'autoplay' user attribute in the session.

## [0.4.2] - 2022-07-29

Besides a couple of small fixes, this point release is mainly to blacklist the
ap-gew4 and ap-gue1 access points that caused librespot to fail to playback
anything.

Development will now shift to the new HTTP-based API, targeted for a future
v0.5.0 release. The new-api branch will therefore be promoted to dev. This is a
major departure from the old API and although it brings many exciting new
things, it is also likely to introduce new bugs and some regressions.

Long story short, this v0.4.2 release is the most stable that librespot has yet
to offer. But, unless anything big comes up, it is also intended as the last
release to be based on the old API. Happy listening.

### Changed
- [playback] `pipe`: Better error handling
- [playback] `subprocess`: Better error handling

### Added
- [core] `apresolve`: Blacklist ap-gew4 and ap-gue1 access points that cause channel errors
- [playback] `pipe`: Implement stop

### Fixed
- [main] fix `--opt=value` line argument logging
- [playback] `alsamixer`: make `--volume-ctrl fixed` work as expected when combined with `--mixer alsa`

## [0.4.1] - 2022-05-23

This release fixes dependency issues when installing from crates.

### Changed
- [chore] The MSRV is now 1.56

### Fixed
- [playback] Fixed dependency issues when installing from crate

## [0.4.0] - 2022-05-21

Note: This version was yanked, because a corrupt package was uploaded and failed
to install.

This is a polishing release, adding a few little extras and improving on many
thers. We had to break a couple of API's to do so, and therefore bumped the
minor version number. v0.4.x may be the last in series before we migrate from
the current channel-based Spotify backend to a more HTTP-based backend.
Targeting that major effort for a v0.5 release sometime, we intend to maintain
v0.4.x as a stable branch until then.

### Changed
- [chore] The MSRV is now 1.53
- [contrib] Hardened security of the `systemd` service units
- [core] `Session`: `connect()` now returns the long-term credentials
- [core] `Session`: `connect()` now accepts a flag if the credentails should be stored via the cache
- [main] Different option descriptions and error messages based on what backends are enabled at build time
- [playback] More robust dynamic limiter for very wide dynamic range (breaking)
- [playback] `alsa`: improve `--device ?` output for the Alsa backend
- [playback] `gstreamer`: create own context, set correct states and use sync handler
- [playback] `pipe`: create file if it doesn't already exist
- [playback] `Sink`: `write()` now receives ownership of the packet (breaking)

### Added
- [main] Enforce reasonable ranges for option values (breaking)
- [main] Add the ability to parse environment variables
- [main] Log now emits warning when trying to use options that would otherwise have no effect
- [main] Verbose logging now logs all parsed environment variables and command line arguments (credentials are redacted)
- [main] Add a `-q`, `--quiet` option that changes the logging level to WARN
- [main] Add `disable-credential-cache` flag (breaking)
- [main] Add a short name for every flag and option
- [playback] `pulseaudio`: set the PulseAudio name to match librespot's device name via `PULSE_PROP_application.name` environment variable (user set env var value takes precedence) (breaking)
- [playback] `pulseaudio`: set icon to `audio-x-generic` so we get an icon instead of a placeholder via `PULSE_PROP_application.icon_name` environment variable (user set env var value takes precedence) (breaking)
- [playback] `pulseaudio`: set values to: `PULSE_PROP_application.version`, `PULSE_PROP_application.process.binary`, `PULSE_PROP_stream.description`, `PULSE_PROP_media.software` and `PULSE_PROP_media.role` environment variables (user set env var values take precedence) (breaking)

### Fixed
- [connect] Don't panic when activating shuffle without previous interaction
- [core] Removed unsafe code (breaking)
- [main] Fix crash when built with Avahi support but Avahi is locally unavailable
- [main] Prevent hang when discovery is disabled and there are no credentials or when bad credentials are given
- [main] Don't panic when parsing options, instead list valid values and exit
- [main] `--alsa-mixer-device` and `--alsa-mixer-index` now fallback to the card and index specified in `--device`.
- [playback] Adhere to ReplayGain spec when calculating gain normalisation factor
- [playback] `alsa`: make `--volume-range` overrides apply to Alsa softvol controls

### Removed
- [playback] `alsamixer`: previously deprecated options `mixer-card`, `mixer-name` and `mixer-index` have been removed

## [0.3.1] - 2021-10-24

### Changed
- Include build profile in the displayed version information
- [playback] Improve dithering CPU usage by about 33%

### Fixed
- [connect] Partly fix behavior after last track of an album/playlist

## [0.3.0] - 2021-10-13

### Added
- [discovery] The crate `librespot-discovery` for discovery in LAN was created. Its functionality was previously part of `librespot-connect`.
- [playback] Add support for dithering with `--dither` for lower requantization error (breaking)
- [playback] Add `--volume-range` option to set dB range and control `log` and `cubic` volume control curves
- [playback] `alsamixer`: support for querying dB range from Alsa softvol
- [playback] Add `--format F64` (supported by Alsa and GStreamer only)
- [playback] Add `--normalisation-gain-type auto` that switches between album and track automatically

### Changed
- [audio, playback] Moved `VorbisDecoder`, `VorbisError`, `AudioPacket`, `PassthroughDecoder`, `PassthroughError`, `DecoderError`, `AudioDecoder` and the `convert` module from `librespot-audio` to `librespot-playback`. The underlying crates `vorbis`, `librespot-tremor`, `lewton` and `ogg` should be used directly. (breaking)
- [audio, playback] Use `Duration` for time constants and functions (breaking)
- [connect, playback] Moved volume controls from `librespot-connect` to `librespot-playback` crate
- [connect] Synchronize player volume with mixer volume on playback
- [playback] Store and pass samples in 64-bit floating point
- [playback] Make cubic volume control available to all mixers with `--volume-ctrl cubic`
- [playback] Normalize volumes to `[0.0..1.0]` instead of `[0..65535]` for greater precision and performance (breaking)
- [playback] `alsamixer`: complete rewrite (breaking)
- [playback] `alsamixer`: query card dB range for the volume control unless specified otherwise
- [playback] `alsamixer`: use `--device` name for `--mixer-card` unless specified otherwise
- [playback] `player`: consider errors in `sink.start`, `sink.stop` and `sink.write` fatal and `exit(1)` (breaking)
- [playback] `player`: make `convert` and `decoder` public so you can implement your own `Sink`
- [playback] `player`: update default normalisation threshold to -2 dBFS
- [playback] `player`: default normalisation type is now `auto`

### Deprecated
- [connect] The `discovery` module was deprecated in favor of the `librespot-discovery` crate
- [playback] `alsamixer`: renamed `mixer-card` to `alsa-mixer-device`
- [playback] `alsamixer`: renamed `mixer-name` to `alsa-mixer-control`
- [playback] `alsamixer`: renamed `mixer-index` to `alsa-mixer-index`

### Removed
- [connect] Removed no-op mixer started/stopped logic (breaking)
- [playback] Removed `with-vorbis` and `with-tremor` features
- [playback] `alsamixer`: removed `--mixer-linear-volume` option, now that `--volume-ctrl {linear|log}` work as expected on Alsa

### Fixed
- [connect] Fix step size on volume up/down events
- [connect] Fix looping back to the first track after the last track of an album or playlist
- [playback] Incorrect `PlayerConfig::default().normalisation_threshold` caused distortion when using dynamic volume normalisation downstream
- [playback] Fix `log` and `cubic` volume controls to be mute at zero volume
- [playback] Fix `S24_3` format on big-endian systems
- [playback] `alsamixer`: make `cubic` consistent between cards that report minimum volume as mute, and cards that report some dB value
- [playback] `alsamixer`: make `--volume-ctrl {linear|log}` work as expected
- [playback] `alsa`, `gstreamer`, `pulseaudio`: always output in native endianness
- [playback] `alsa`: revert buffer size to ~500 ms
- [playback] `alsa`, `pipe`, `pulseaudio`: better error handling
- [metadata] Skip tracks whose Spotify ID's can't be found (e.g. local files, which aren't supported)

## [0.2.0] - 2021-05-04

## [0.1.6] - 2021-02-22

## [0.1.5] - 2021-02-21

## [0.1.3] - 2020-07-29

## [0.1.2] - 2020-07-22

## [0.1.1] - 2020-01-30

## [0.1.0] - 2019-11-06

[0.5.0-dev]: https://github.com/librespot-org/librespot/compare/v0.4.1..HEAD
[0.4.2]: https://github.com/librespot-org/librespot/compare/v0.4.1..v0.4.2
[0.4.1]: https://github.com/librespot-org/librespot/compare/v0.4.0..v0.4.1
[0.4.0]: https://github.com/librespot-org/librespot/compare/v0.3.1..v0.4.0
[0.3.1]: https://github.com/librespot-org/librespot/compare/v0.3.0..v0.3.1
[0.3.0]: https://github.com/librespot-org/librespot/compare/v0.2.0..v0.3.0
[0.2.0]: https://github.com/librespot-org/librespot/compare/v0.1.6..v0.2.0
[0.1.6]: https://github.com/librespot-org/librespot/compare/v0.1.5..v0.1.6
[0.1.5]: https://github.com/librespot-org/librespot/compare/v0.1.3..v0.1.5
[0.1.3]: https://github.com/librespot-org/librespot/compare/v0.1.2..v0.1.3
[0.1.2]: https://github.com/librespot-org/librespot/compare/v0.1.1..v0.1.2
[0.1.1]: https://github.com/librespot-org/librespot/compare/v0.1.0..v0.1.1
[0.1.0]: https://github.com/librespot-org/librespot/releases/tag/v0.1.0