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System-wide speakup
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=== Sharing Speakup between multiple users === Things would be a lot easier if we could run one espeakup instance per user. This is tricky because the Speakup kernel modules don't have concepts of users or sessions. There's a wide list of engineering problems to solve with this: * Saving and restoring per-user Speakup settings * Saving and restoring the softsynth state between users * Proxying /dev/softsynth so users can't read other's data * Restricting access to the fakekey input device * Handling graceful handovers from ALSA to PulseAudio * Handling forceful handovers from PulseAudio to ALSA * Shim PulseAudio so it waits for hardware access before running * Flow control to indicate when the proxy is ready to send * Flow control to indicate when espeakup is ready to talk * Buffering data when espeakup isn't ready * Discarding buffered data when speakup signals espeakup to shut up * Handling messages sent back from espeakup to speakup and flow control for that There's a lot to untangle here since we're touching multiple levels of abstraction.
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