[Chromecast] Introduce a MediaCapabilitiesShlib::IsSupportedAudioConfig

This new API is similar to IsSupportedVideoConfig and is strictly-typed
unlike the old MediaCodecSupportShlib::IsSupported, which is going to
be deprecated.

Review-Url: https://codereview.chromium.org/2677143003
Cr-Commit-Position: refs/heads/master@{#460576}

chromecast/media/cma/backend/alsa/media_codec_support_cast_audio.cc

@@ -40,5 +40,10 @@ bool MediaCapabilitiesShlib::IsSupportedVideoConfig(VideoCodec codec,
   return (codec == kCodecH264 || codec == kCodecVP8 || codec == kCodecVP9);
 }
 
+bool MediaCapabilitiesShlib::IsSupportedAudioConfig(const AudioConfig& config) {
+  return config.codec == kCodecAAC || config.codec == kCodecMP3 ||
+         config.codec == kCodecPCM;
+}
+
 }  // namespace media
 }  // namespace chromecast

chromecast/media/cma/backend/cast_media_android.cc

@@ -57,5 +57,12 @@ bool MediaCapabilitiesShlib::IsSupportedVideoConfig(VideoCodec codec,
   return false;
 }
 
+bool MediaCapabilitiesShlib::IsSupportedAudioConfig(const AudioConfig& config) {
+  // This should not be called directly.
+  NOTREACHED() << "Unexpected call to "
+               << "MediaCapabilitiesShlib::IsSupportedAudioConfig on Android";
+  return false;
+}
+
 }  // namespace media
 }  // namespace chromecast

chromecast/media/cma/backend/cast_media_default.cc

@@ -111,5 +111,10 @@ bool MediaCapabilitiesShlib::IsSupportedVideoConfig(VideoCodec codec,
   return (codec == kCodecH264 || codec == kCodecVP8);
 }
 
+bool MediaCapabilitiesShlib::IsSupportedAudioConfig(const AudioConfig& config) {
+  return config.codec == kCodecAAC || config.codec == kCodecMP3 ||
+         config.codec == kCodecPCM;
+}
+
 }  // namespace media
 }  // namespace chromecast

chromecast/media/cma/backend/cast_media_dummy.cc

@@ -52,5 +52,10 @@ bool MediaCapabilitiesShlib::IsSupportedVideoConfig(VideoCodec codec,
   return (codec == kCodecH264 || codec == kCodecVP8);
 }
 
+bool MediaCapabilitiesShlib::IsSupportedAudioConfig(const AudioConfig& config) {
+  return config.codec == kCodecAAC || config.codec == kCodecMP3 ||
+         config.codec == kCodecPCM;
+}
+
 }  // namespace media
 }  // namespace chromecast

chromecast/public/media/media_capabilities_shlib.h

@@ -25,6 +25,9 @@ class CHROMECAST_EXPORT MediaCapabilitiesShlib {
   static bool IsSupportedVideoConfig(VideoCodec codec,
                                      VideoProfile profile,
                                      int level);
+
+  // Return true if the platform supports the given audio |config|.
+  static bool IsSupportedAudioConfig(const AudioConfig& config);
 };
 
 }  // namespace media