Add sample rates checking in MediaStreamAudioProcessor

content/renderer/media/media_stream_audio_processor.cc

 // Copyright 2013 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 "content/renderer/media/media_stream_audio_processor.h"
 
 #include "base/command_line.h"
 #include "base/metrics/field_trial.h"
 #include "base/metrics/histogram.h"
 #include "base/trace_event/trace_event.h"
@@ skipping 119 matching lines @@
                        int source_frames,
                        int destination_frames,
                        int sample_rate)
      : source_channels_(source_channels),
        source_frames_(source_frames),
        sample_rate_(sample_rate),
        destination_(
            new MediaStreamAudioBus(destination_channels, destination_frames)),
        data_available_(false) {
     DCHECK_GE(source_channels, destination_channels);
-    DCHECK_GT(sample_rate_, 0);
+    DCHECK_GE(sample_rate_, 8000);
+    DCHECK_LE(sample_rate_, 48000);
 
     if (source_channels > destination_channels) {
       audio_source_intermediate_ =
           media::AudioBus::CreateWrapper(destination_channels);
     }
 
     if (source_frames != destination_frames) {
       // Since we require every Push to be followed by as many Consumes as
       // possible, twice the larger of the two is a (probably) loose upper bound
       // on the FIFO size.
@@ skipping 527 matching lines @@
   if (echo_information_) {
     echo_information_.get()->UpdateAecDelayStats(ap->echo_cancellation());
   }
 
   // Return 0 if the volume hasn't been changed, and otherwise the new volume.
   return (agc->stream_analog_level() == volume) ?
       0 : agc->stream_analog_level();
 }
 
 }  // namespace content