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Third party redistributors might choose to skip distributing this for a couple reasons: - missing dependencies - lack of interest in TTS as a feature Lay some groundwork for handling this with fewer error message popups. In particular note that speechd / flite depend on PyQt6 being built with it, so support *may* appear dynamically after calibre is installed, and available_engines queries Qt to see what is available. Piper is built as part of calibre though, and if it has been patched out or skipped via `setup.py build --only=xxx` we can at least avoid claiming it's there. Entrypoints into TTS eventually tend to consolidate into creating the backend. This gives us one consistent place to raise errors for missing backends... which however doesn't handle forcing a backend name. A forced backend that is unavailable ended up hitting the "no prefs" fallback code to use the default engine, which returned a different backend than the one which is *forced*, and later a KeyError when tweak_book attempted to access the backend name it forced but which didn't exist. Instead, raise an immediate "TTS engine piper is not available" error dialog box, preventing any further confusing tracebacks.
calibre
calibre is an e-book manager. It can view, convert, edit and catalog e-books in all of the major e-book formats. It can also talk to e-book reader devices. It can go out to the internet and fetch metadata for your books. It can download newspapers and convert them into e-books for convenient reading. It is cross platform, running on Linux, Windows and macOS.
For more information, see the calibre About page.
Screenshots
Usage
See the User Manual.
Development
Setting up a development environment for calibre.
A tarball of the source code for the current calibre release.
Bugs
Bug reports and feature requests should be made in the calibre bug tracker at Launchpad. GitHub is only used for code hosting and pull requests.
Support calibre
calibre is a result of the efforts of many volunteers from all over the world. If you find it useful, please consider contributing to support its development. Donate to support calibre development.
Building calibre binaries
See Build instructions for instructions on how to build the calibre binaries and installers for all the platforms calibre supports.
calibre package versions in various repositories
