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67 lines
2.4 KiB
67 lines
2.4 KiB
7 months ago
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/*
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* Copyright 2020 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef MEGA_PLAYER_AUDIOSOURCE_H
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#define MEGA_PLAYER_AUDIOSOURCE_H
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class AudioSource {
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public:
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AudioSource() {}
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virtual ~AudioSource() {}
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static const int NUMCHANNELS_UNSPECIFIED = -1;
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static const int NUMCHANNELS_ERROR = -2;
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virtual int getNumChannels() { return NUMCHANNELS_UNSPECIFIED; }
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// Encoding Constants (specific to MegaAudio)
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static const int ENCODING_UNSPECIFIED = -1;
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static const int ENCODING_ERROR = -2;
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static const int ENCODING_UNINITIALIZED = 0;
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static const int ENCODING_FLOAT = 1;
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static const int ENCODING_PCM16 = 2;
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static const int ENCODING_PCM24 = 3;
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static const int ENCODING_PCM32 = 4;
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virtual int getEncoding() { return ENCODING_UNSPECIFIED; };
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/**
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* Called before the stream starts to allow initialization of the source
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* @param numFrames The number of frames that will be requested in each pull() call.
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* @param numChans The number of channels in the stream.
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*/
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virtual void init(int numFrames, int numChans) {}
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/**
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* Reset the stream to its beginning
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*/
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virtual void reset() {}
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virtual void trigger() {}
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/**
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* Process a request for audio data.
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* @param audioData The buffer to be filled.
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* @param numFrames The number of frames of audio to provide.
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* @param numChans The number of channels (in the buffer) required by the player.
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* @return The number of frames actually generated. If this value is less than that
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* requested, it may be interpreted by the player as the end of playback.
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* Note that the player will be blocked by this call.
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* Note that the data is assumed to be *interleaved*.
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*/
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virtual int pull(float* buffer, int numFrames, int numChans) = 0;
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};
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#endif // MEGA_PLAYER_AUDIOSOURCE_H
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