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Unified Diff: content/renderer/media/webaudio_media_stream_source.h

Issue 1834323002: MediaStream audio: Refactor 3 separate "glue" implementations into one. (Closed) Base URL: https://chromium.googlesource.com/chromium/src.git@master
Patch Set: REBASE + Workaround to ensure MediaStreamAudioProcessor is destroyed on the main thread. Created 4 years, 7 months ago
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Index: content/renderer/media/webaudio_media_stream_source.h
diff --git a/content/renderer/media/webaudio_capturer_source.h b/content/renderer/media/webaudio_media_stream_source.h
similarity index 41%
rename from content/renderer/media/webaudio_capturer_source.h
rename to content/renderer/media/webaudio_media_stream_source.h
index c98d0f05b4597c07438f98d8f3806093469a4205..b8577c5cc81ebe8b30e889e85b0d4cc6b1c975e1 100644
--- a/content/renderer/media/webaudio_capturer_source.h
+++ b/content/renderer/media/webaudio_media_stream_source.h
@@ -2,18 +2,14 @@
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
-#ifndef CONTENT_RENDERER_MEDIA_WEBAUDIO_CAPTURER_SOURCE_H_
-#define CONTENT_RENDERER_MEDIA_WEBAUDIO_CAPTURER_SOURCE_H_
+#ifndef CONTENT_RENDERER_MEDIA_WEBAUDIO_MEDIA_STREAM_SOURCE_H_
+#define CONTENT_RENDERER_MEDIA_WEBAUDIO_MEDIA_STREAM_SOURCE_H_
-#include <stddef.h>
+#include <memory>
-#include "base/macros.h"
-#include "base/synchronization/lock.h"
-#include "base/threading/thread_checker.h"
#include "base/time/time.h"
+#include "content/renderer/media/media_stream_audio_source.h"
#include "media/base/audio_bus.h"
-#include "media/base/audio_capturer_source.h"
-#include "media/base/audio_parameters.h"
#include "media/base/audio_push_fifo.h"
#include "third_party/WebKit/public/platform/WebAudioDestinationConsumer.h"
#include "third_party/WebKit/public/platform/WebMediaStreamSource.h"
@@ -21,64 +17,52 @@
namespace content {
-class WebRtcLocalAudioTrack;
-
-// WebAudioCapturerSource is the missing link between
-// WebAudio's MediaStreamAudioDestinationNode and WebRtcLocalAudioTrack.
-//
-// 1. WebKit calls the setFormat() method setting up the basic stream format
-// (channels, and sample-rate).
-// 2. consumeAudio() is called periodically by WebKit which dispatches the
-// audio stream to the WebRtcLocalAudioTrack::Capture() method.
-class WebAudioCapturerSource : public blink::WebAudioDestinationConsumer {
+// Implements the WebAudioDestinationConsumer interface to provide a source of
+// audio data (i.e., the output from a graph of WebAudio nodes) to one or more
+// MediaStreamAudioTracks. Audio data is transported directly to the tracks in
+// 10 ms chunks.
+class WebAudioMediaStreamSource final
+ : NON_EXPORTED_BASE(public MediaStreamAudioSource),
+ public blink::WebAudioDestinationConsumer {
public:
- explicit WebAudioCapturerSource(blink::WebMediaStreamSource* blink_source);
+ explicit WebAudioMediaStreamSource(blink::WebMediaStreamSource* blink_source);
- ~WebAudioCapturerSource() override;
+ ~WebAudioMediaStreamSource() override;
+ private:
// WebAudioDestinationConsumer implementation.
- // setFormat() is called early on, so that we can configure the audio track.
+ //
+ // Note: Blink ensures setFormat() and consumeAudio() are not called
+ // concurrently across threads, but these methods could be called on any
+ // thread.
void setFormat(size_t number_of_channels, float sample_rate) override;
- // MediaStreamAudioDestinationNode periodically calls consumeAudio().
- // Called on the WebAudio audio thread.
void consumeAudio(const blink::WebVector<const float*>& audio_data,
size_t number_of_frames) override;
- // Called when the WebAudioCapturerSource is hooking to a media audio track.
- // |track| is the sink of the data flow and must remain alive until Stop() is
- // called.
- void Start(WebRtcLocalAudioTrack* track);
-
- // Called when the media audio track is stopping.
- void Stop();
-
- private:
// Called by AudioPushFifo zero or more times during the call to
// consumeAudio(). Delivers audio data with the required buffer size to the
- // track.
+ // tracks.
void DeliverRebufferedAudio(const media::AudioBus& audio_bus,
int frame_delay);
- // Deregisters this object from its blink::WebMediaStreamSource.
- void DeregisterFromBlinkSource();
+ // MediaStreamAudioSource implementation.
+ bool EnsureSourceIsStarted() final;
+ void EnsureSourceIsStopped() final;
- // Used to DCHECK that some methods are called on the correct thread.
+ // In debug builds, check that all methods that could cause object graph
+ // or data flow changes are being called on the main thread.
base::ThreadChecker thread_checker_;
- // The audio track this WebAudioCapturerSource is feeding data to.
- WebRtcLocalAudioTrack* track_;
-
- media::AudioParameters params_;
-
- // Flag to help notify the |track_| when the audio format has changed.
- bool audio_format_changed_;
+ // True while this WebAudioMediaStreamSource is registered with
+ // |blink_source_| and is consuming audio.
+ bool is_registered_consumer_;
// A wrapper used for providing audio to |fifo_|.
std::unique_ptr<media::AudioBus> wrapper_bus_;
// Takes in the audio data passed to consumeAudio() and re-buffers it into 10
- // ms chunks for the track. This ensures each chunk of audio delivered to the
- // track has the required buffer size, regardless of the amount of audio
+ // ms chunks for the tracks. This ensures each chunk of audio delivered to
+ // the tracks has the required buffer size, regardless of the amount of audio
// provided via each consumeAudio() call.
media::AudioPushFifo fifo_;
@@ -86,16 +70,13 @@ class WebAudioCapturerSource : public blink::WebAudioDestinationConsumer {
// DeliverRebufferedAudio().
base::TimeTicks current_reference_time_;
- // Synchronizes HandleCapture() with AudioCapturerSource calls.
- base::Lock lock_;
-
// This object registers with a blink::WebMediaStreamSource. We keep track of
- // that in order to be able to deregister before stopping the audio track.
+ // that in order to be able to deregister before stopping this source.
blink::WebMediaStreamSource blink_source_;
- DISALLOW_COPY_AND_ASSIGN(WebAudioCapturerSource);
+ DISALLOW_COPY_AND_ASSIGN(WebAudioMediaStreamSource);
};
} // namespace content
-#endif // CONTENT_RENDERER_MEDIA_WEBAUDIO_CAPTURER_SOURCE_H_
+#endif // CONTENT_RENDERER_MEDIA_WEBAUDIO_MEDIA_STREAM_SOURCE_H_
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