[Hotword] Adding audio parameters to handle audio coming from the DSP.

media/audio/cras/cras_input.cc

Index: media/audio/cras/cras_input.cc
diff --git a/media/audio/cras/cras_input.cc b/media/audio/cras/cras_input.cc
index 0b8644603f8996e670b988c282a1b234e4062ee0..e4579971589675b746630e1837cab2f16a489979 100644
--- a/media/audio/cras/cras_input.cc
+++ b/media/audio/cras/cras_input.cc
@@ -14,6 +14,9 @@
 
 namespace media {
 
+// Flag to indicate hotword stream.
+static const uint32_t kHotwordParam = 1;

[dgreid, 2014/12/10 00:23:35]

This will be 0x03. or even better HOTWORD_STREAM from cras_types.h once this
lands:
https://chromium-review.googlesource.com/#/c/233104/2/cras/src/common/cras_ty...

[rpetterson, 2014/12/10 00:37:43]

Cool. When do you think that will land?

[dgreid, 2014/12/10 00:54:50]

hopefully soon. I need to get a build without it and dependencies to push to dev
and make sure a crash is fixed, then I can land it.

[rpetterson, 2014/12/13 01:04:00]

I've updated the way I think you mean. Let me know if it looks okay.

+
 CrasInputStream::CrasInputStream(const AudioParameters& params,
                                  AudioManagerCras* manager,
                                  const std::string& device_id)
@@ -159,6 +162,10 @@ void CrasInputStream::Start(AudioInputCallback* callback) {
     return;
   }
 
+  uint32_t flags = 0;
+  if (params_.effects() & AudioParameters::PlatformEffectsMask::HOTWORD)
+    flags = kHotwordParam;
+
   unsigned int frames_per_packet = params_.frames_per_buffer();
   cras_stream_params* stream_params = cras_client_stream_params_create(
       stream_direction_,
@@ -166,7 +173,7 @@ void CrasInputStream::Start(AudioInputCallback* callback) {
       frames_per_packet,  // Call back when this many ready.
       frames_per_packet,  // Minimum Callback level ignored for capture streams.
       CRAS_STREAM_TYPE_DEFAULT,
-      0,  // Unused flags.
+      flags,
       this,
       CrasInputStream::SamplesReady,
       CrasInputStream::StreamError,