| /* |
| * Copyright 2019 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. |
| */ |
| package com.plausiblesoftware.drumthumper |
| |
| import android.content.res.AssetManager |
| import android.util.Log |
| import java.io.IOException |
| |
| class DrumPlayer { |
| companion object { |
| // Sample attributes |
| val NUM_PLAY_CHANNELS: Int = 2 // The number of channels in the player Stream. |
| // Stereo Playback, set to 1 for Mono playback |
| // This IS NOT the channel format of the source samples |
| // (which must be mono). |
| val NUM_SAMPLE_CHANNELS: Int = 1; // All WAV resource must be mono |
| val SAMPLE_RATE: Int = 44100 // All the input samples are assumed to BE 44.1K |
| // All the input samples are assumed to be mono. |
| |
| // Sample Buffer IDs |
| val BASSDRUM: Int = 0 |
| val SNAREDRUM: Int = 1 |
| val CRASHCYMBAL: Int = 2 |
| val RIDECYMBAL: Int = 3 |
| val MIDTOM: Int = 4 |
| val LOWTOM: Int = 5 |
| val HIHATOPEN: Int = 6 |
| val HIHATCLOSED: Int = 7 |
| |
| // initial pan position for each drum sample |
| val PAN_BASSDRUM: Float = 0f // Dead Center |
| val PAN_SNAREDRUM: Float = 0.25f // A little Right |
| val PAN_CRASHCYMBAL: Float = -0.75f // Mostly Left |
| val PAN_RIDECYMBAL: Float = 1.0f // Hard Right |
| val PAN_MIDTOM: Float = -0.75f // Mostly Left |
| val PAN_LOWTOM: Float = 0.75f // Mostly Right |
| val PAN_HIHATOPEN: Float = -1.0f // Hard Left |
| val PAN_HIHATCLOSED: Float = -1.0f // Hard Left |
| |
| // Logging Tag |
| val TAG: String = "DrumPlayer" |
| } |
| |
| fun setupAudioStream() { |
| setupAudioStreamNative(SAMPLE_RATE, NUM_PLAY_CHANNELS) |
| } |
| |
| fun teardownAudioStream() { |
| teardownAudioStreamNative() |
| } |
| |
| // asset-based samples |
| fun loadWavAssets(assetMgr: AssetManager): Boolean { |
| var allAssetsCorrect = true |
| allAssetsCorrect = loadWavAsset(assetMgr, "KickDrum.wav", BASSDRUM, PAN_BASSDRUM) && allAssetsCorrect |
| allAssetsCorrect = loadWavAsset(assetMgr, "SnareDrum.wav", SNAREDRUM, PAN_SNAREDRUM) && allAssetsCorrect |
| allAssetsCorrect = loadWavAsset(assetMgr, "CrashCymbal.wav", CRASHCYMBAL, PAN_CRASHCYMBAL) && allAssetsCorrect |
| allAssetsCorrect = loadWavAsset(assetMgr, "RideCymbal.wav", RIDECYMBAL, PAN_RIDECYMBAL) && allAssetsCorrect |
| allAssetsCorrect = loadWavAsset(assetMgr, "MidTom.wav", MIDTOM, PAN_MIDTOM) && allAssetsCorrect |
| allAssetsCorrect = loadWavAsset(assetMgr, "LowTom.wav", LOWTOM, PAN_LOWTOM) && allAssetsCorrect |
| allAssetsCorrect = loadWavAsset(assetMgr, "HiHat_Open.wav", HIHATOPEN, PAN_HIHATOPEN) && allAssetsCorrect |
| allAssetsCorrect = loadWavAsset(assetMgr, "HiHat_Closed.wav", HIHATCLOSED, PAN_HIHATCLOSED) && allAssetsCorrect |
| |
| return allAssetsCorrect |
| } |
| |
| fun unloadWavAssets() { |
| unloadWavAssetsNative() |
| } |
| |
| fun loadWavAsset(assetMgr: AssetManager, assetName: String, index: Int, pan: Float) : Boolean { |
| var returnVal = false |
| try { |
| val assetFD = assetMgr.openFd(assetName) |
| val dataStream = assetFD.createInputStream(); |
| var dataLen = assetFD.getLength().toInt() |
| var dataBytes: ByteArray = ByteArray(dataLen) |
| dataStream.read(dataBytes, 0, dataLen) |
| returnVal = loadWavAssetNative(dataBytes, index, pan, SAMPLE_RATE, NUM_SAMPLE_CHANNELS) |
| assetFD.close() |
| } catch (ex: IOException) { |
| Log.i(TAG, "IOException" + ex) |
| } |
| |
| return returnVal |
| } |
| |
| external fun setupAudioStreamNative(sampleRate: Int, numChannels: Int) |
| external fun teardownAudioStreamNative() |
| |
| external fun loadWavAssetNative( |
| wavBytes: ByteArray, index: Int, pan: Float, rate: Int, channels: Int) : Boolean |
| external fun unloadWavAssetsNative() |
| |
| external fun trigger(drumIndex: Int) |
| |
| external fun setPan(index: Int, pan: Float) |
| external fun getPan(index: Int): Float |
| |
| external fun setGain(index: Int, gain: Float) |
| external fun getGain(index: Int): Float |
| |
| external fun getOutputReset() : Boolean |
| external fun clearOutputReset() |
| |
| external fun restartStream() |
| } |