Add native log and uma stat when all input shared memory buffers are full

media/audio/audio_input_device.cc

 // Copyright (c) 2012 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.
 
 #include "media/audio/audio_input_device.h"
 
 #include "base/basictypes.h"
 #include "base/bind.h"
 #include "base/memory/scoped_vector.h"
 #include "base/threading/thread_restrictions.h"
@@ skipping 291 matching lines @@
   uint8* ptr = static_cast<uint8*>(shared_memory_.memory());
   ptr += current_segment_id_ * segment_length_;
   AudioInputBuffer* buffer = reinterpret_cast<AudioInputBuffer*>(ptr);
   // Usually this will be equal but in the case of low sample rate (e.g. 8kHz,
   // the buffer may be bigger (on mac at least)).
   DCHECK_GE(buffer->params.size,
             segment_length_ - sizeof(AudioInputBufferParameters));
   double volume = buffer->params.volume;
   bool key_pressed = buffer->params.key_pressed;
 
+  // Reset the size of the buffer to 0 to notify the browser that
+  // the buffer has been consumed.
+  buffer->params.size = 0;

[tommi (sloooow) - chröme, 2014/08/29 09:16:43]

do we have unit tests?

[no longer working on chromium, 2014/08/29 11:15:20]

Unfortunately we don't have unittest for this shard memory, but I have already
verified that it works as expected.

+
   // Use pre-allocated audio bus wrapping existing block of shared memory.
   media::AudioBus* audio_bus = audio_buses_[current_segment_id_];
 
   // Deliver captured data to the client in floating point format
   // and update the audio-delay measurement.
   int audio_delay_milliseconds = pending_data / bytes_per_ms_;
   capture_callback_->Capture(
       audio_bus, audio_delay_milliseconds, volume, key_pressed);
 
   if (++current_segment_id_ >= total_segments_)
     current_segment_id_ = 0;
 }
 
 }  // namespace media