Implementation of MediaCodecPlayer stage 1

media/base/android/access_unit_queue.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/base/android/access_unit_queue.h"
+
+#include "base/logging.h"
+#include "media/base/demuxer_stream.h"
+
+namespace media {
+
+AccessUnitQueue::AccessUnitQueue() : has_eos_(false) {}
+
+AccessUnitQueue::~AccessUnitQueue() {}
+
+void AccessUnitQueue::PushBack(const DemuxerData& data) {
+  // TODO(timav): The lock is expensive here because it lasts
+  // for the whole duration of data copying. We need to figure out
+  // what to do with this.
+
+  // Media thread
+  base::AutoLock lock(lock_);
+
+  // We expect that the chunk containing EOS is the last chunk
+  DCHECK(!has_eos_);
+
+  DCHECK(!data.access_units.empty());
+
+#if DCHECK_IS_ON()
+  // Verify the rule "one DemuxerConfigs for one AU with |kConfigChanged|".
+  size_t num_config_placeholders = 0;
+#endif
+
+  for (const AccessUnit& unit : data.access_units) {
+#if DCHECK_IS_ON()
+    if (unit.status == DemuxerStream::kConfigChanged)
+      ++num_config_placeholders;
+#endif
+    access_units_.push_back(unit);
+    if (unit.is_end_of_stream) {
+      DVLOG(1) << "AccessUnitQueue::" << __FUNCTION__ << ": EOS detected";
+      has_eos_ = true;
+    }
+  }
+
+  DCHECK(data.demuxer_configs.size() == num_config_placeholders);
+
+  for (const DemuxerConfigs& conf : data.demuxer_configs)
+    demuxer_configs_.push_back(conf);
+}
+
+void AccessUnitQueue::PopFront() {
+  // Decoder thread
+  base::AutoLock lock(lock_);
+
+  if (access_units_.front().status == DemuxerStream::kConfigChanged)
+    demuxer_configs_.pop_front();
+
+  access_units_.pop_front();
+
+  if (access_units_.empty())
+    has_eos_ = false;
+}
+
+void AccessUnitQueue::Flush() {
+  // Media thread
+  base::AutoLock lock(lock_);
+
+  access_units_.clear();
+  demuxer_configs_.clear();
+  has_eos_ = false;
+}
+
+bool AccessUnitQueue::SkipToKeyFrame() {
+  // Media thread
+  base::AutoLock lock(lock_);
+  // We assume there cannot be |demuxer_configs_| elements for non-key frames.
+
+  std::deque<AccessUnit>::iterator it;
+  for (it = access_units_.begin(); it!= access_units_.end(); ++it) {
+    if (it->is_key_frame) {
+      access_units_.erase(access_units_.begin(), it);
+      return true;
+    }
+  }
+
+  return false;
+}
+
+void AccessUnitQueue::GetInfo(Info* info) const {
+  // Media thread, Decoder thread
+  base::AutoLock lock(lock_);
+
+  info->length = access_units_.size();
+  info->has_eos = has_eos_;
+  info->front_unit = nullptr;
+  info->configs = nullptr;
+
+  if (info->length > 0) {
+    info->front_unit = &access_units_.front();
+    if (access_units_.front().status == DemuxerStream::kConfigChanged) {
+      DCHECK(!demuxer_configs_.empty());
+      info->configs = &demuxer_configs_.front();
+    }
+  }
+}
+
+}  // namespace media