Replace WebAudio MediaCodec usage with FFmpeg. A ~4x improvement.

content/browser/renderer_host/render_message_filter.cc

Index: content/browser/renderer_host/render_message_filter.cc
diff --git a/content/browser/renderer_host/render_message_filter.cc b/content/browser/renderer_host/render_message_filter.cc
index d422083d81cb974fc3a103cb7f77e7ff1c466f99..44114fd7e9e221e1c10995b3e4b254e3631313c1 100644
--- a/content/browser/renderer_host/render_message_filter.cc
+++ b/content/browser/renderer_host/render_message_filter.cc
@@ -79,7 +79,6 @@
 
 #if defined(OS_ANDROID)
 #include "content/browser/media/android/media_throttler.h"
-#include "media/base/android/webaudio_media_codec_bridge.h"
 #endif
 
 #if defined(OS_MACOSX)
@@ -101,13 +100,6 @@ base::LazyInstance<gfx::ColorProfile>::Leaky g_color_profile =
     LAZY_INSTANCE_INITIALIZER;
 #endif
 
-#if defined(OS_ANDROID)
-void CloseWebAudioFileDescriptor(int fd) {
-  if (close(fd))
-    VLOG(1) << "Couldn't close output webaudio fd: " << strerror(errno);
-}
-#endif
-
 }  // namespace
 
 RenderMessageFilter::RenderMessageFilter(
@@ -202,9 +194,6 @@ bool RenderMessageFilter::OnMessageReceived(const IPC::Message& message) {
                         OnGetMonitorColorProfile)
 #endif
     IPC_MESSAGE_HANDLER(ViewHostMsg_MediaLogEvents, OnMediaLogEvents)
-#if defined(OS_ANDROID)
-    IPC_MESSAGE_HANDLER(ViewHostMsg_RunWebAudioMediaCodec, OnWebAudioMediaCodec)
-#endif
     IPC_MESSAGE_UNHANDLED(handled = false)
   IPC_END_MESSAGE_MAP()
 
@@ -610,32 +599,6 @@ void RenderMessageFilter::OnMediaLogEvents(
     media_internals_->OnMediaEvents(render_process_id_, events);
 }
 
-#if defined(OS_ANDROID)
-void RenderMessageFilter::OnWebAudioMediaCodec(
-    base::SharedMemoryHandle encoded_data_handle,
-    base::FileDescriptor pcm_output,
-    uint32_t data_size) {
-  if (!MediaThrottler::GetInstance()->RequestDecoderResources()) {
-    base::WorkerPool::PostTask(
-        FROM_HERE,
-        base::Bind(&CloseWebAudioFileDescriptor, pcm_output.fd),
-        true);
-    VLOG(1) << "Cannot decode audio data due to throttling";
-  } else {
-    // Let a WorkerPool handle this request since the WebAudio
-    // MediaCodec bridge is slow and can block while sending the data to
-    // the renderer.
-    base::WorkerPool::PostTask(
-        FROM_HERE,
-        base::Bind(&media::WebAudioMediaCodecBridge::RunWebAudioMediaCodec,
-                   encoded_data_handle, pcm_output, data_size,
-                   base::Bind(&MediaThrottler::OnDecodeRequestFinished,
-                              base::Unretained(MediaThrottler::GetInstance()))),
-        true);
-  }
-}
-#endif
-
 void RenderMessageFilter::OnAllocateGpuMemoryBuffer(gfx::GpuMemoryBufferId id,
                                                     uint32_t width,
                                                     uint32_t height,