MKAudioInput: increase size of the encode output buffer to 960 bytes.

Like we did for desktop Mumble in 5fa918be84cdcc218b7e2def33438f8ccbb9dd04.

"With Opus frames are no longer limited to a duration of 10ms
like with CELT. This means a single frame can now become
bigger than previously possible. At our maximum supported rate
of 96kbit/s with 60ms frames a single frame will be 720 bytes.
Previously the encoding output buffer was 512 bytes which triggered
rate limiting in Opus to hit this goal."

1 files changed, 6 insertions, 3 deletions

diff --git a/src/MKAudioInput.m b/src/MKAudioInput.m
index ea1db33..d2b6ad7 100644
--- a/src/MKAudioInput.m
+++ b/src/MKAudioInput.m
@@ -72,6 +72,7 @@
     double                 _vadGateTimeSeconds;
     double                 _vadOpenLastTime;
 
+    NSMutableData          *_encodingOutputBuffer;
     NSMutableData          *_opusBuffer;
     
     MKConnection           *_connection;
@@ -179,6 +180,7 @@
 
     [frameList release];
     [_opusBuffer release];
+    [_encodingOutputBuffer release];
 
     if (psMic)
         free(psMic);
@@ -534,10 +536,11 @@
          return;
      }
     
-    unsigned char buffer[500];
-    int len = [self encodeAudioFrameOfSpeech:_doTransmit intoBuffer:&buffer[0] ofSize:500];
+    if (_encodingOutputBuffer == nil)
+        _encodingOutputBuffer = [[NSMutableData alloc] initWithLength:960];
+    int len = [self encodeAudioFrameOfSpeech:_doTransmit intoBuffer:[_encodingOutputBuffer mutableBytes] ofSize:[_encodingOutputBuffer length]];
     if (len >= 0) {
-        NSData *outputBuffer = [[NSData alloc] initWithBytes:buffer length:len];
+        NSData *outputBuffer = [[NSData alloc] initWithBytes:[_encodingOutputBuffer bytes] length:len];
         [self flushCheck:outputBuffer terminator:!_doTransmit];
         [outputBuffer release];
     }