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87 lines
2.9 KiB
87 lines
2.9 KiB
/*
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* Copyright (C) 2017 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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#define LOG_TAG "AAudioService"
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//#define LOG_NDEBUG 0
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#include <utils/Log.h>
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#include <cstring>
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#include "AAudioMixer.h"
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using android::WrappingBuffer;
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using android::FifoBuffer;
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using android::fifo_frames_t;
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AAudioMixer::~AAudioMixer() {
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delete[] mOutputBuffer;
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}
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void AAudioMixer::allocate(int32_t samplesPerFrame, int32_t framesPerBurst) {
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mSamplesPerFrame = samplesPerFrame;
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mFramesPerBurst = framesPerBurst;
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int32_t samplesPerBuffer = samplesPerFrame * framesPerBurst;
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mOutputBuffer = new float[samplesPerBuffer];
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mBufferSizeInBytes = samplesPerBuffer * sizeof(float);
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}
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void AAudioMixer::clear() {
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memset(mOutputBuffer, 0, mBufferSizeInBytes);
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}
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bool AAudioMixer::mix(FifoBuffer *fifo, float volume) {
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WrappingBuffer wrappingBuffer;
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float *destination = mOutputBuffer;
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fifo_frames_t framesLeft = mFramesPerBurst;
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// Gather the data from the client. May be in two parts.
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fifo->getFullDataAvailable(&wrappingBuffer);
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// Mix data in one or two parts.
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int partIndex = 0;
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while (framesLeft > 0 && partIndex < WrappingBuffer::SIZE) {
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fifo_frames_t framesToMix = framesLeft;
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fifo_frames_t framesAvailable = wrappingBuffer.numFrames[partIndex];
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if (framesAvailable > 0) {
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if (framesToMix > framesAvailable) {
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framesToMix = framesAvailable;
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}
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mixPart(destination, (float *)wrappingBuffer.data[partIndex], framesToMix, volume);
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destination += framesToMix * mSamplesPerFrame;
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framesLeft -= framesToMix;
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}
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partIndex++;
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}
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fifo->getFifoControllerBase()->advanceReadIndex(mFramesPerBurst - framesLeft);
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if (framesLeft > 0) {
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//ALOGW("AAudioMixer::mix() UNDERFLOW by %d / %d frames ----- UNDERFLOW !!!!!!!!!!",
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// framesLeft, mFramesPerBurst);
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}
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return (framesLeft > 0); // did not get all the frames we needed, ie. "underflow"
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}
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void AAudioMixer::mixPart(float *destination, float *source, int32_t numFrames, float volume) {
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int32_t numSamples = numFrames * mSamplesPerFrame;
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// TODO maybe optimize using SIMD
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for (int sampleIndex = 0; sampleIndex < numSamples; sampleIndex++) {
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*destination++ += *source++ * volume;
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}
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}
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float *AAudioMixer::getOutputBuffer() {
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return mOutputBuffer;
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}
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