Make AudioTimestampHelper::TimeToFrames() more accurate

media/base/audio_timestamp_helper.cc

 // Copyright (c) 2012 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/audio_timestamp_helper.h"
 
 #include "base/logging.h"
 #include "media/base/timestamp_constants.h"
 
 namespace media {
 
 // static
 base::TimeDelta AudioTimestampHelper::FramesToTime(int64_t frames,
                                                    int samples_per_second) {
   DCHECK_GE(samples_per_second, 0);
   return base::TimeDelta::FromMicroseconds(
       frames * base::Time::kMicrosecondsPerSecond / samples_per_second);
 }
 
 // static
 int64_t AudioTimestampHelper::TimeToFrames(base::TimeDelta time,
                                            int samples_per_second) {
-  return time.InSecondsF() * samples_per_second;
+  return std::round(time.InSecondsF() * samples_per_second);
 }
 
 AudioTimestampHelper::AudioTimestampHelper(int samples_per_second)
     : base_timestamp_(kNoTimestamp), frame_count_(0) {
   DCHECK_GT(samples_per_second, 0);
   double fps = samples_per_second;
   microseconds_per_frame_ = base::Time::kMicrosecondsPerSecond / fps;
 }
 
 void AudioTimestampHelper::SetBaseTimestamp(base::TimeDelta base_timestamp) {
@@ skipping 45 matching lines @@
 
 base::TimeDelta AudioTimestampHelper::ComputeTimestamp(
     int64_t frame_count) const {
   DCHECK_GE(frame_count, 0);
   DCHECK(base_timestamp_ != kNoTimestamp);
   double frames_us = microseconds_per_frame_ * frame_count;
   return base_timestamp_ + base::TimeDelta::FromMicroseconds(frames_us);
 }
 
 }  // namespace media