e97974d203
This implements some of the suggestions in https://codereview.webrtc.org/2386383003/, namely * Removing anonymous mixing. * Removing the volume meter. BUG=webrtc:6346 Review-Url: https://codereview.webrtc.org/2402283003 Cr-Commit-Position: refs/heads/master@{#14609}
72 lines
2.6 KiB
C++
72 lines
2.6 KiB
C++
/*
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* Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#ifndef WEBRTC_MODULES_AUDIO_MIXER_AUDIO_MIXER_H_
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#define WEBRTC_MODULES_AUDIO_MIXER_AUDIO_MIXER_H_
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#include <memory>
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#include "webrtc/modules/include/module_common_types.h"
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namespace webrtc {
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class AudioMixer {
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public:
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static const int kMaximumAmountOfMixedAudioSources = 3;
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// A callback class that all mixer participants must inherit from/implement.
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class Source {
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public:
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enum class AudioFrameInfo {
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kNormal, // The samples in audio_frame are valid and should be used.
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kMuted, // The samples in audio_frame should not be used, but should be
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// implicitly interpreted as zero. Other fields in audio_frame
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// may be read and should contain meaningful values.
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kError // audio_frame will not be used.
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};
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struct AudioFrameWithInfo {
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AudioFrame* audio_frame;
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AudioFrameInfo audio_frame_info;
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};
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// The implementation of GetAudioFrameWithInfo should update
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// audio_frame with new audio every time it's called. Implementing
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// classes are allowed to return the same AudioFrame pointer on
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// different calls. The pointer must stay valid until the next
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// mixing call or until this audio source is disconnected from the
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// mixer. The mixer may modify the contents of the passed
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// AudioFrame pointer at any time until the next call to
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// GetAudioFrameWithInfo, or until the source is removed from the
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// mixer.
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virtual AudioFrameWithInfo GetAudioFrameWithInfo(int sample_rate_hz) = 0;
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protected:
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virtual ~Source() {}
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};
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// Factory method. Constructor disabled.
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static std::unique_ptr<AudioMixer> Create();
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virtual ~AudioMixer() {}
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// Add/remove audio sources as candidates for mixing.
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virtual int32_t SetMixabilityStatus(Source* audio_source, bool mixable) = 0;
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// Performs mixing by asking registered audio sources for audio. The
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// mixed result is placed in the provided AudioFrame. Will only be
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// called from a single thread. The rate and channels arguments
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// specify the rate and number of channels of the mix result.
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virtual void Mix(int sample_rate_hz,
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size_t number_of_channels,
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AudioFrame* audio_frame_for_mixing) = 0;
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};
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} // namespace webrtc
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#endif // WEBRTC_MODULES_AUDIO_MIXER_AUDIO_MIXER_H_
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