Introduce AudioBufferMemoryPool to avoid thrashing on audio buffers.

media/cdm/cdm_adapter.cc

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "media/cdm/cdm_adapter.h"
 
 #include <stddef.h>
 #include <utility>
 
 #include "base/bind.h"
@@ skipping 358 matching lines @@
       cdm_config_(cdm_config),
       session_message_cb_(session_message_cb),
       session_closed_cb_(session_closed_cb),
       session_keys_change_cb_(session_keys_change_cb),
       session_expiration_update_cb_(session_expiration_update_cb),
       audio_samples_per_second_(0),
       audio_channel_layout_(CHANNEL_LAYOUT_NONE),
       allocator_(std::move(allocator)),
       create_cdm_file_io_cb_(create_cdm_file_io_cb),
       task_runner_(base::ThreadTaskRunnerHandle::Get()),
+      pool_(new AudioBufferMemoryPool()),
       weak_factory_(this) {
   DCHECK(!key_system_.empty());
   DCHECK(!session_message_cb_.is_null());
   DCHECK(!session_closed_cb_.is_null());
   DCHECK(!session_keys_change_cb_.is_null());
   DCHECK(!session_expiration_update_cb_.is_null());
   DCHECK(allocator_);
 }
 
 CdmAdapter::~CdmAdapter() {}
@@ skipping 540 matching lines @@
     // Setup channel pointers.  AudioBuffer::CopyFrom() will only use the first
     // one in the case of interleaved data.
     const int size_per_channel = frame_size / audio_channel_count;
     for (int i = 0; i < audio_channel_count; ++i)
       channel_ptrs[i] = data + i * size_per_channel;
 
     const int frame_count = frame_size / audio_bytes_per_frame;
     scoped_refptr<media::AudioBuffer> frame = media::AudioBuffer::CopyFrom(
         sample_format, audio_channel_layout_, audio_channel_count,
         audio_samples_per_second_, frame_count, &channel_ptrs[0],
-        base::TimeDelta::FromMicroseconds(timestamp));
+        base::TimeDelta::FromMicroseconds(timestamp), pool_);
     result_frames->push_back(frame);
 
     data += frame_size;
     bytes_left -= frame_size;
   } while (bytes_left > 0);
 
   return true;
 }
 
 }  // namespace media