Support floating-point audio output for Linux

media/audio/pulse/pulse_output.cc

Index: media/audio/pulse/pulse_output.cc
diff --git a/media/audio/pulse/pulse_output.cc b/media/audio/pulse/pulse_output.cc
index f86860571a03fca4390c4149704888b5c3630d55..1b431397be3529fb9b6cf5dceeb16a0ccfa3dd6b 100644
--- a/media/audio/pulse/pulse_output.cc
+++ b/media/audio/pulse/pulse_output.cc
@@ -12,6 +12,7 @@
 #include "media/audio/audio_device_description.h"
 #include "media/audio/audio_manager_base.h"
 #include "media/audio/pulse/pulse_util.h"
+#include "media/base/audio_sample_types.h"
 
 namespace media {
 
@@ -146,8 +147,13 @@ void PulseAudioOutputStream::FulfillWriteRequest(size_t requested_bytes) {
       // Note: If this ever changes to output raw float the data must be clipped
       // and sanitized since it may come from an untrusted source such as NaCl.
       audio_bus_->Scale(volume_);
+#if 0
       audio_bus_->ToInterleaved(
           audio_bus_->frames(), params_.bits_per_sample() / 8, buffer);
+#else
+      audio_bus_->ToInterleaved<Float32SampleTypeTraits>(
+          audio_bus_->frames(), reinterpret_cast<float*>(buffer));

[DaleCurtis, 2016/11/01 18:51:37]

is buffer allocated correctly?

+#endif
     } else {
       memset(buffer, 0, bytes_to_fill);
     }