Quick fix for Alsa stutter - Wake up sooner....

media/audio/linux/alsa_output.cc

 // Copyright (c) 2009 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 //
 // THREAD SAFETY
 //
 // The AlsaPcmOutputStream object's internal state is accessed by two threads:
 //
 //   client thread - creates the object and calls the public APIs.
 //   message loop thread - executes all the internal tasks including querying
@@ skipping 611 matching lines @@
 
   // Adjust for timer resolution issues.
   if (next_fill_time_ms > kSleepErrorMilliseconds) {
     next_fill_time_ms -= kSleepErrorMilliseconds;
   }
 
   // Avoid busy looping if the data source is exhausted.
   if (current_packet->size == 0) {
     next_fill_time_ms = std::max(next_fill_time_ms, kNoDataSleepMilliseconds);
   }
+  next_fill_time_ms /= 2;   // TODO(fbarchard): Remove this hack.

[scherkus (not reviewing), 2009/10/22 01:42:30]

nit: should have two spaces between ; and //

also it'd be good to file a bug and mention it in the TODO

 
   // Only schedule more reads/writes if we are still in the playing state.
   if (shared_data_.state() == kIsPlaying) {
     if (next_fill_time_ms <= 0) {
       message_loop_->PostTask(
           FROM_HERE,
           NewRunnableMethod(this, &AlsaPcmOutputStream::WriteTask));
     } else {
       // TODO(ajwong): Measure the reliability of the delay interval.  Use
       // base/histogram.h.
@@ skipping 294 matching lines @@
 }
 
 // Changes the AudioSourceCallback to proxy calls to.  Pass in NULL to
 // release ownership of the currently registered callback.
 void AlsaPcmOutputStream::SharedData::set_source_callback(
     AudioSourceCallback* callback) {
   DCHECK_EQ(MessageLoop::current(), state_transition_loop_);
   AutoLock l(lock_);
   source_callback_ = callback;
 }