Roll FFmpeg for M37.

media/filters/audio_file_reader.cc

Index: media/filters/audio_file_reader.cc
diff --git a/media/filters/audio_file_reader.cc b/media/filters/audio_file_reader.cc
index 80f8ce60a624e66d0016224d1e0b6cd88476f8d5..a987b46ceb94e523ea4a01f14c345e6559311272 100644
--- a/media/filters/audio_file_reader.cc
+++ b/media/filters/audio_file_reader.cc
@@ -131,7 +131,6 @@ int AudioFileReader::Read(AudioBus* audio_bus) {
     // decoded from the packet; otherwise av_free_packet() will corrupt memory.
     AVPacket packet_temp = packet;
     do {
-      avcodec_get_frame_defaults(av_frame.get());
       int frame_decoded = 0;
       int result = avcodec_decode_audio4(
           codec_context_, av_frame.get(), &frame_decoded, &packet_temp);
@@ -155,6 +154,7 @@ int AudioFileReader::Read(AudioBus* audio_bus) {
       int frames_read = av_frame->nb_samples;
       if (frames_read < 0) {
         continue_decoding = false;
+        av_frame_unref(av_frame.get());
         break;
       }
 
@@ -177,6 +177,7 @@ int AudioFileReader::Read(AudioBus* audio_bus) {
 
         // This is an unrecoverable error, so bail out.
         continue_decoding = false;
+        av_frame_unref(av_frame.get());
         break;
       }
 
@@ -210,6 +211,7 @@ int AudioFileReader::Read(AudioBus* audio_bus) {
       }
 
       current_frame += frames_read;
+      av_frame_unref(av_frame.get());
     } while (packet_temp.size > 0);
     av_free_packet(&packet);
   }