Replace av_malloc with AlignedAlloc for memory allocation in DecoderBuffer.

media/base/decoder_buffer.cc

Index: media/base/decoder_buffer.cc
diff --git a/media/base/decoder_buffer.cc b/media/base/decoder_buffer.cc
index 527fb65ec945c550fc673aca5501aed16ec79fe3..3c298a4ff062809a5af26b5ffd8ba27bf9c03208 100644
--- a/media/base/decoder_buffer.cc
+++ b/media/base/decoder_buffer.cc
@@ -6,8 +6,9 @@
 
 #include "base/logging.h"
 #include "media/base/decrypt_config.h"
+
 #if !defined(OS_ANDROID)
-#include "media/ffmpeg/ffmpeg_common.h"
+#include "base/memory/aligned_memory.h"
 #endif
 
 namespace media {
@@ -34,7 +35,7 @@ DecoderBuffer::DecoderBuffer(const uint8* data, int buffer_size)
 
 DecoderBuffer::~DecoderBuffer() {
 #if !defined(OS_ANDROID)
-  av_free(data_);
+  base::AlignedFree(data_);
 #else
   delete[] data_;
 #endif
@@ -43,12 +44,9 @@ DecoderBuffer::~DecoderBuffer() {
 void DecoderBuffer::Initialize() {
   DCHECK_GE(buffer_size_, 0);
 #if !defined(OS_ANDROID)
-  // Why FF_INPUT_BUFFER_PADDING_SIZE?  FFmpeg assumes all input buffers are
-  // padded.  Using av_malloc with padding ensures FFmpeg only recieves data
-  // padded and aligned to its specifications.
   data_ = reinterpret_cast<uint8*>(
-      av_malloc(buffer_size_ + FF_INPUT_BUFFER_PADDING_SIZE));
-  memset(data_ + buffer_size_, 0, FF_INPUT_BUFFER_PADDING_SIZE);
+      base::AlignedAlloc(buffer_size_ + kPaddingSize, kAlignmentSize));
+  memset(data_ + buffer_size_, 0, kPaddingSize);
 #else
   data_ = new uint8[buffer_size_];
 #endif