86 lines
3.3 KiB
C
86 lines
3.3 KiB
C
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/*
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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_VOICE_ENGINE_VOE_EXTERNAL_MEDIA_H
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#define WEBRTC_VOICE_ENGINE_VOE_EXTERNAL_MEDIA_H
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#include "webrtc/common_types.h"
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namespace webrtc {
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class VoiceEngine;
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class AudioFrame;
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class WEBRTC_DLLEXPORT VoEMediaProcess {
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public:
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// The VoiceEngine user should override the Process() method in a
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// derived class. Process() will be called when audio is ready to
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// be processed. The audio can be accessed in several different modes
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// given by the |type| parameter. The function should modify the
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// original data and ensure that it is copied back to the |audio10ms|
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// array. The number of samples in the frame cannot be changed.
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// The sampling frequency will depend upon the codec used.
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// If |isStereo| is true, audio10ms will contain 16-bit PCM data
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// samples in interleaved stereo format (L0,R0,L1,R1,...).
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virtual void Process(int channel,
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ProcessingTypes type,
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int16_t audio10ms[],
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size_t length,
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int samplingFreq,
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bool isStereo) = 0;
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protected:
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virtual ~VoEMediaProcess() {}
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};
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class WEBRTC_DLLEXPORT VoEExternalMedia {
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public:
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// Factory for the VoEExternalMedia sub-API. Increases an internal
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// reference counter if successful. Returns NULL if the API is not
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// supported or if construction fails.
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static VoEExternalMedia* GetInterface(VoiceEngine* voiceEngine);
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// Releases the VoEExternalMedia sub-API and decreases an internal
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// reference counter. Returns the new reference count. This value should
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// be zero for all sub-API:s before the VoiceEngine object can be safely
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// deleted.
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virtual int Release() = 0;
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// Installs a VoEMediaProcess derived instance and activates external
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// media for the specified |channel| and |type|.
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virtual int RegisterExternalMediaProcessing(
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int channel,
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ProcessingTypes type,
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VoEMediaProcess& processObject) = 0;
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// Removes the VoEMediaProcess derived instance and deactivates external
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// media for the specified |channel| and |type|.
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virtual int DeRegisterExternalMediaProcessing(int channel,
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ProcessingTypes type) = 0;
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// Pulls an audio frame from the specified |channel| for external mixing.
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// If the |desired_sample_rate_hz| is 0, the signal will be returned with
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// its native frequency, otherwise it will be resampled. Valid frequencies
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// are 16, 22, 32, 44 or 48 kHz.
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virtual int GetAudioFrame(int channel,
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int desired_sample_rate_hz,
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AudioFrame* frame) = 0;
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// Sets the state of external mixing. Cannot be changed during playback.
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virtual int SetExternalMixing(int channel, bool enable) = 0;
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protected:
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VoEExternalMedia() {}
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virtual ~VoEExternalMedia() {}
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};
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} // namespace webrtc
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#endif // WEBRTC_VOICE_ENGINE_VOE_EXTERNAL_MEDIA_H
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