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Unified Diff: content/browser/media/audio_stream_monitor.h

Issue 562863002: Gardening: Revert "Use AudioStreamMonitor to control power save blocking." (Closed) Base URL: https://chromium.googlesource.com/chromium/src.git@master
Patch Set: Created 6 years, 3 months ago
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Index: content/browser/media/audio_stream_monitor.h
diff --git a/content/browser/media/audio_stream_monitor.h b/content/browser/media/audio_stream_monitor.h
deleted file mode 100644
index d1a32d5f857b05925f884ef64d834e673c8c5f29..0000000000000000000000000000000000000000
--- a/content/browser/media/audio_stream_monitor.h
+++ /dev/null
@@ -1,153 +0,0 @@
-// Copyright 2014 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.
-
-#ifndef CONTENT_BROWSER_MEDIA_AUDIO_STREAM_MONITOR_H_
-#define CONTENT_BROWSER_MEDIA_AUDIO_STREAM_MONITOR_H_
-
-#include <map>
-#include <utility>
-
-#include "base/callback_forward.h"
-#include "base/threading/thread_checker.h"
-#include "base/time/default_tick_clock.h"
-#include "base/time/time.h"
-#include "base/timer/timer.h"
-#include "build/build_config.h"
-#include "content/common/content_export.h"
-#include "media/audio/audio_output_controller.h"
-
-namespace base {
-class TickClock;
-}
-
-namespace content {
-class WebContents;
-
-// Repeatedly polls audio streams for their power levels, and "debounces" the
-// information into a simple, binary "was recently audible" result for the audio
-// indicators in the tab UI. The debouncing logic is to: 1) Turn on immediately
-// when sound is audible; and 2) Hold on for X amount of time after sound has
-// gone silent, then turn off. Said another way, we don't want tab indicators
-// to turn on/off repeatedly and annoy the user. AudioStreamMonitor sends UI
-// update notifications only when needed, but may be queried at any time.
-//
-// Each WebContentsImpl owns an AudioStreamMonitor.
-class CONTENT_EXPORT AudioStreamMonitor {
- public:
- explicit AudioStreamMonitor(WebContents* contents);
- ~AudioStreamMonitor();
-
- // Indicates if audio stream monitoring is available. It's only available if
- // AudioOutputController can and will monitor output power levels.
- static bool monitoring_available() {
- return media::AudioOutputController::will_monitor_audio_levels();
- }
-
- // Returns true if audio has recently been audible from the tab. This is
- // usually called whenever the tab data model is refreshed; but there are
- // other use cases as well (e.g., the OOM killer uses this to de-prioritize
- // the killing of tabs making sounds).
- bool WasRecentlyAudible() const;
-
- // Starts or stops audio level monitoring respectively for the stream owned by
- // the specified renderer. Safe to call from any thread.
- //
- // The callback returns the current power level (in dBFS units) and the clip
- // status (true if any part of the audio signal has clipped since the last
- // callback run). |stream_id| must be unique within a |render_process_id|.
- typedef base::Callback<std::pair<float, bool>()> ReadPowerAndClipCallback;
- static void StartMonitoringStream(
- int render_process_id,
- int render_frame_id,
- int stream_id,
- const ReadPowerAndClipCallback& read_power_callback);
- static void StopMonitoringStream(int render_process_id,
- int render_frame_id,
- int stream_id);
-
- void set_was_recently_audible_for_testing(bool value) {
- was_recently_audible_ = value;
- }
-
- private:
- friend class AudioStreamMonitorTest;
-
- enum {
- // Desired polling frequency. Note: If this is set too low, short-duration
- // "blip" sounds won't be detected. http://crbug.com/339133#c4
- kPowerMeasurementsPerSecond = 15,
-
- // Amount of time to hold a tab indicator on after its last blurt.
- kHoldOnMilliseconds = 2000
- };
-
- // Helper methods for starting and stopping monitoring which lookup the
- // identified renderer and forward calls to the correct AudioStreamMonitor.
- static void StartMonitoringHelper(
- int render_process_id,
- int render_frame_id,
- int stream_id,
- const ReadPowerAndClipCallback& read_power_callback);
- static void StopMonitoringHelper(int render_process_id,
- int render_frame_id,
- int stream_id);
-
- // Starts polling the stream for audio stream power levels using |callback|.
- void StartMonitoringStreamOnUIThread(
- int render_process_id,
- int stream_id,
- const ReadPowerAndClipCallback& callback);
-
- // Stops polling the stream, discarding the internal copy of the |callback|
- // provided in the call to StartMonitoringStream().
- void StopMonitoringStreamOnUIThread(int render_process_id, int stream_id);
-
- // Called by |poll_timer_| to sample the power levels from each of the streams
- // playing in the tab.
- void Poll();
-
- // Compares last known indicator state with what it should be, and triggers UI
- // updates through |web_contents_| if needed. When the indicator is turned
- // on, |off_timer_| is started to re-invoke this method in the future.
- void MaybeToggle();
-
- // The WebContents instance instance to receive indicator toggle
- // notifications. This pointer should be valid for the lifetime of
- // AudioStreamMonitor.
- WebContents* const web_contents_;
-
- // Note: |clock_| is always |&default_tick_clock_|, except during unit
- // testing.
- base::DefaultTickClock default_tick_clock_;
- base::TickClock* const clock_;
-
- // Confirms single-threaded access in debug builds.
- base::ThreadChecker thread_checker_;
-
- // The callbacks to read power levels for each stream. Only playing (i.e.,
- // not paused) streams will have an entry in this map.
- typedef std::pair<int, int> StreamID;
- typedef std::map<StreamID, ReadPowerAndClipCallback> StreamPollCallbackMap;
- StreamPollCallbackMap poll_callbacks_;
-
- // Records the last time at which sound was audible from any stream.
- base::TimeTicks last_blurt_time_;
-
- // Set to true if the last call to MaybeToggle() determined the indicator
- // should be turned on.
- bool was_recently_audible_;
-
- // Calls Poll() at regular intervals while |poll_callbacks_| is non-empty.
- base::RepeatingTimer<AudioStreamMonitor> poll_timer_;
-
- // Started only when an indicator is toggled on, to turn it off again in the
- // future.
- base::OneShotTimer<AudioStreamMonitor> off_timer_;
-
- DISALLOW_COPY_AND_ASSIGN(AudioStreamMonitor);
-};
-
-} // namespace content
-
-#endif // CONTENT_BROWSER_MEDIA_AUDIO_STREAM_MONITOR_H_
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