change opus sample format to kSampleFormatF32

media/formats/webm/webm_audio_client.cc

Index: media/formats/webm/webm_audio_client.cc
diff --git a/media/formats/webm/webm_audio_client.cc b/media/formats/webm/webm_audio_client.cc
index e0d382c256b12707aafd0b8a78c1679a16c72d81..92bb40f0ace1be47ed4d346c628e41c4d5702cb7 100644
--- a/media/formats/webm/webm_audio_client.cc
+++ b/media/formats/webm/webm_audio_client.cc
@@ -29,6 +29,7 @@ bool WebMAudioClient::InitializeConfig(
     int64 seek_preroll, int64 codec_delay, bool is_encrypted,
     AudioDecoderConfig* config) {
   DCHECK(config);
+  SampleFormat sample_format = kSampleFormatPlanarF32;
 
   AudioCodec audio_codec = kUnknownAudioCodec;
   if (codec_id == "A_VORBIS") {
@@ -60,8 +61,10 @@ bool WebMAudioClient::InitializeConfig(
 
   // Always use 48kHz for OPUS.  See the "Input Sample Rate" section of the
   // spec: http://tools.ietf.org/html/draft-terriberry-oggopus-01#page-11
-  if (audio_codec == kCodecOpus)
+  if (audio_codec == kCodecOpus) {
     samples_per_second = 48000;
+    sample_format = kSampleFormatF32;
+  }
 
   const uint8* extra_data = NULL;
   size_t extra_data_size = 0;
@@ -81,7 +84,7 @@ bool WebMAudioClient::InitializeConfig(
 
   config->Initialize(
       audio_codec,
-      (audio_codec == kCodecOpus) ? kSampleFormatS16 : kSampleFormatPlanarF32,
+      sample_format,
       channel_layout,
       samples_per_second,
       extra_data,