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