Use passthrough decoder for (E)AC3 formats

media/base/android/media_codec_util.cc

Index: media/base/android/media_codec_util.cc
diff --git a/media/base/android/media_codec_util.cc b/media/base/android/media_codec_util.cc
index 3bb4fc7d39b02243dcf7fa9194457dcee9235f35..5b93fe2ba1e7ab8fbd5bec17c44e55f2544a1305 100644
--- a/media/base/android/media_codec_util.cc
+++ b/media/base/android/media_codec_util.cc
@@ -41,6 +41,7 @@ const char kOpusMimeType[] = "audio/opus";
 const char kVorbisMimeType[] = "audio/vorbis";
 const char kAc3MimeType[] = "audio/ac3";
 const char kEac3MimeType[] = "audio/eac3";
+const char kBitstreamAudioMimeType[] = "audio/raw";
 const char kAvcMimeType[] = "video/avc";
 const char kHevcMimeType[] = "video/hevc";
 const char kVp8MimeType[] = "video/x-vnd.on2.vp8";
@@ -98,6 +99,9 @@ static bool IsEncoderSupportedByDevice(const std::string& android_mime_type) {
 
 // static
 std::string MediaCodecUtil::CodecToAndroidMimeType(AudioCodec codec) {
+  if (IsPassthroughAudioFormat(codec))
+    return kBitstreamAudioMimeType;
+
   switch (codec) {
     case kCodecMP3:
       return kMp3MimeType;
@@ -359,6 +363,11 @@ bool MediaCodecUtil::IsSetOutputSurfaceSupported() {
   return Java_MediaCodecUtil_isSetOutputSurfaceSupported(env);
 }
 
+// static
+bool MediaCodecUtil::IsPassthroughAudioFormat(AudioCodec codec) {
+  return codec == kCodecAC3 || codec == kCodecEAC3;
+}
+
 // static
 bool MediaCodecUtil::CodecNeedsFlushWorkaround(MediaCodecBridge* codec) {
   int sdk_int = base::android::BuildInfo::GetInstance()->sdk_int();