Implementation of new AecDump interface.

webrtc/modules/audio_processing/aec_dump/write_to_file_task.cc

+/*
+ *  Copyright (c) 2017 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include "webrtc/modules/audio_processing/aec_dump/write_to_file_task.h"
+
+namespace webrtc {
+
+WriteToFileTask::WriteToFileTask(webrtc::FileWrapper* debug_file,
+                                 int64_t* num_bytes_left_for_log)
+    : debug_file_(debug_file),
+      num_bytes_left_for_log_(num_bytes_left_for_log) {}
+
+WriteToFileTask::~WriteToFileTask() = default;
+
+audioproc::Event* WriteToFileTask::GetEvent() {
+  return &event_;
+}
+
+bool WriteToFileTask::IsRoomForNextEvent(size_t event_byte_size) const {
+  int64_t next_message_size = event_byte_size + sizeof(int32_t);
+  return (*num_bytes_left_for_log_ < 0) ||
+         (*num_bytes_left_for_log_ >= next_message_size);
+}
+
+void WriteToFileTask::UpdateBytesLeft(size_t event_byte_size) {
+  RTC_DCHECK(IsRoomForNextEvent(event_byte_size));
+  if (*num_bytes_left_for_log_ >= 0) {
+    *num_bytes_left_for_log_ -= (sizeof(int32_t) + event_byte_size);
+  }
+}
+
+bool WriteToFileTask::Run() {
+  if (!debug_file_->is_open()) {
+    return true;
+  }
+
+  std::string event_string;
+  event_.SerializeToString(&event_string);
+
+  const size_t event_byte_size = event_.ByteSize();
+
+  if (!IsRoomForNextEvent(event_byte_size)) {
+    debug_file_->CloseFile();
+    return true;
+  }
+
+  UpdateBytesLeft(event_byte_size);
+
+  // Write message preceded by its size.
+  if (!debug_file_->Write(&event_byte_size, sizeof(int32_t))) {
+    RTC_NOTREACHED();
+  }
+  if (!debug_file_->Write(event_string.data(), event_string.length())) {
+    RTC_NOTREACHED();
+  }
+  return true;  // Delete task from queue at once.
+}
+
+}  // namespace webrtc