Support floating-point audio output for Linux

media/base/audio_bus.h

 // 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.
 
 #ifndef MEDIA_BASE_AUDIO_BUS_H_
 #define MEDIA_BASE_AUDIO_BUS_H_
 
 #include <stdint.h>
 
 #include <memory>
@@ skipping 133 matching lines @@
 
   // Helper method to copy frames from one AudioBus to another. Both AudioBus
   // objects must have the same number of channels(). |source_start_frame| is
   // the starting offset. |dest_start_frame| is the starting offset in |dest|.
   // |frame_count| is the number of frames to copy.
   void CopyPartialFramesTo(int source_start_frame,
                            int frame_count,
                            int dest_start_frame,
                            AudioBus* dest) const;
 
+  // Clamp the data in the bus to the range [-1, 1].  NaN is mapped to
+  // 0 (arbitrarily).
+  void Clamp();
+
   // Returns a raw pointer to the requested channel.  Pointer is guaranteed to
   // have a 16-byte alignment.  Warning: Do not rely on having sane (i.e. not
   // inf, nan, or between [-1.0, 1.0]) values in the channel data.
   float* channel(int channel) { return channel_data_[channel]; }
   const float* channel(int channel) const { return channel_data_[channel]; }
 
   // Returns the number of channels.
   int channels() const { return static_cast<int>(channel_data_.size()); }
   // Returns the number of frames.
   int frames() const { return frames_; }
@@ skipping 156 matching lines @@
 
   AudioBusRefCounted(int channels, int frames);
   ~AudioBusRefCounted() override;
 
   DISALLOW_COPY_AND_ASSIGN(AudioBusRefCounted);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_BASE_AUDIO_BUS_H_