Bug#854295: brltty-espeak: crashes while emitting speech

[Samuel Thibault <sthibault@debian.org>]

Hello,

Sebastian Humenda, on Sun 05 Feb 2017 21:02:37 +0100, wrote:
> I'm not sure whether the issue is actually in BRLTTY or espeak-ng, but
> I couldn't encounter any issues while using speech-dispatcher with
> espeak-ng yet.

Ok.  I'm afraid that might be an issue with the way BRLTTY uses espeak
and espeak-ng behaves: BRLTTY sets a callback, but espeak-ng calls it
from its own thread, which may pose some unexpected issues.  Could you
try the attached patch? It may cripple BRLTTY functionalities a bit, but
at least potentially make it more robust for Stretch, and we'll have a
closer look upstream.

Samuel

diff --git a/Drivers/Speech/eSpeak/speech.c b/Drivers/Speech/eSpeak/speech.c
index 6c303c759..9b58bc58b 100644
--- a/Drivers/Speech/eSpeak/speech.c
+++ b/Drivers/Speech/eSpeak/speech.c
@@ -167,7 +189,7 @@ static int spk_construct(volatile SpeechSynthesizer *spk, char **parameters)
 		if (val > espeakRATE_MINIMUM) maxrate = val;
 	}
 
-	espeak_SetSynthCallback(SynthCallback);
+	//espeak_SetSynthCallback(SynthCallback);
 
 	return 1;
 }