Audio output debug recording.

media/audio/audio_debug_file_writer.cc

Index: media/audio/audio_debug_file_writer.cc
diff --git a/media/audio/audio_debug_file_writer.cc b/media/audio/audio_debug_file_writer.cc
index 85bf3a46c1b9f4a16843ba9fc9b4ad6123e91852..ba181e9e4c24f3f98c27e20d3323e83884f139f2 100644
--- a/media/audio/audio_debug_file_writer.cc
+++ b/media/audio/audio_debug_file_writer.cc
@@ -13,6 +13,7 @@
 #include "base/memory/ptr_util.h"
 #include "base/sys_byteorder.h"
 #include "media/base/audio_bus.h"
+#include "media/base/audio_sample_types.h"
 
 namespace media {
 
@@ -170,7 +171,8 @@ class AudioDebugFileWriter::AudioFileWriter {
   // Number of written samples.
   uint64_t samples_;
 
-  // Input audio parameters required to build wave header.
+  // Audio parameters required to build wave header. Number of channels and
+  // sample rate are used.
   const AudioParameters params_;
 
   // Intermediate buffer to be written to file. Interleaved 16 bit audio data.
@@ -230,9 +232,7 @@ AudioDebugFileWriter::AudioFileWriter::AudioFileWriter(
     : samples_(0),
       params_(params),
       interleaved_data_size_(0),
-      task_runner_(std::move(task_runner)) {
-  DCHECK_EQ(params.bits_per_sample(), kBytesPerSample * 8);
-}
+      task_runner_(std::move(task_runner)) {}
 
 AudioDebugFileWriter::AudioFileWriter::~AudioFileWriter() {
   DCHECK(task_runner_->BelongsToCurrentThread());
@@ -242,6 +242,7 @@ AudioDebugFileWriter::AudioFileWriter::~AudioFileWriter() {
 
 void AudioDebugFileWriter::AudioFileWriter::Write(const AudioBus* data) {
   DCHECK(task_runner_->BelongsToCurrentThread());
+  DCHECK_EQ(params_.channels(), data->channels());
   if (!file_.IsValid())
     return;
 
@@ -252,8 +253,8 @@ void AudioDebugFileWriter::AudioFileWriter::Write(const AudioBus* data) {
     interleaved_data_size_ = data_size;
   }
   samples_ += data_size;
-  data->ToInterleaved(data->frames(), sizeof(interleaved_data_[0]),
-                      interleaved_data_.get());
+  data->ToInterleaved<media::SignedInt16SampleTypeTraits>(
+      data->frames(), interleaved_data_.get());
 
 #ifndef ARCH_CPU_LITTLE_ENDIAN
   static_assert(sizeof(interleaved_data_[0]) == sizeof(uint16_t),
@@ -349,4 +350,8 @@ bool AudioDebugFileWriter::WillWrite() {
   return !!file_writer_;
 }
 
+const base::FilePath::CharType* AudioDebugFileWriter::GetFileNameExtension() {
+  return FILE_PATH_LITERAL("wav");
+}
+
 }  // namspace media