blob: e13ab14055b3cb71d239d0b3938c2ff7e8de7e1a [file] [log] [blame]
// 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 "chrome/renderer/media/cast_receiver_audio_valve.h"
#include "base/bind.h"
#include "base/bind_helpers.h"
#include "media/base/audio_parameters.h"
const media::AudioParameters& params,
media::AudioCapturerSource::CaptureCallback* cb)
: cb_(cb),
sample_rate_(params.sample_rate()) {
CastReceiverAudioValve::~CastReceiverAudioValve() {}
void CastReceiverAudioValve::DeliverDecodedAudio(
const media::AudioBus* audio_bus,
base::TimeTicks playout_time) {
current_playout_time_ = playout_time;
// The following will result in zero, one, or multiple synchronous calls to
// DeliverRebufferedAudio().
void CastReceiverAudioValve::DeliverRebufferedAudio(
const media::AudioBus& audio_bus,
int frame_delay) {
const base::TimeTicks playout_time =
current_playout_time_ +
frame_delay * base::Time::kMicrosecondsPerSecond / sample_rate_);
base::AutoLock lock(lock_);
if (cb_) {
// The AudioCapturerSource::Callback interface provides timing information
// only as a relative delay value that means "captured N milliseconds ago."
// Therefore, translate the playout time to these semantics. Since playout
// time is generally in the future, because audio should be decoded well
// ahead of when it should be played out, the audio delay value will
// generally be negative.
// TimeTicks::Now() is being called after the |lock_| was acquired in order
// to provide the most accurate delay value.
const int audio_delay_milliseconds =
(base::TimeTicks::Now() - playout_time).InMilliseconds();
cb_->Capture(&audio_bus, audio_delay_milliseconds, 1.0 /* volume */,
false /* key_pressed */);
void CastReceiverAudioValve::Stop() {
base::AutoLock lock(lock_);
cb_ = nullptr;