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118 lines
4.0 KiB
118 lines
4.0 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 "AAudioMixer"
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//#define LOG_NDEBUG 0
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#include <utils/Log.h>
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#define ATRACE_TAG ATRACE_TAG_AUDIO
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#include <cstring>
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#include <utils/Trace.h>
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#include "AAudioMixer.h"
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#ifndef AAUDIO_MIXER_ATRACE_ENABLED
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#define AAUDIO_MIXER_ATRACE_ENABLED 1
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#endif
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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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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 = std::make_unique<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.get(), 0, mBufferSizeInBytes);
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}
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int32_t AAudioMixer::mix(int streamIndex, std::shared_ptr<FifoBuffer> fifo, bool allowUnderflow) {
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WrappingBuffer wrappingBuffer;
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float *destination = mOutputBuffer.get();
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#if AAUDIO_MIXER_ATRACE_ENABLED
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ATRACE_BEGIN("aaMix");
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#endif /* AAUDIO_MIXER_ATRACE_ENABLED */
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// Gather the data from the client. May be in two parts.
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fifo_frames_t fullFrames = fifo->getFullDataAvailable(&wrappingBuffer);
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#if AAUDIO_MIXER_ATRACE_ENABLED
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if (ATRACE_ENABLED()) {
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char rdyText[] = "aaMixRdy#";
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char letter = 'A' + (streamIndex % 26);
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rdyText[sizeof(rdyText) - 2] = letter;
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ATRACE_INT(rdyText, fullFrames);
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}
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#else /* MIXER_ATRACE_ENABLED */
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(void) trackIndex;
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#endif /* AAUDIO_MIXER_ATRACE_ENABLED */
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// If allowUnderflow then always advance by one burst even if we do not have the data.
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// Otherwise the stream timing will drift whenever there is an underflow.
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// This actual underflow can then be detected by the client for XRun counting.
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//
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// Generally, allowUnderflow will be false when stopping a stream and we want to
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// use up whatever data is in the queue.
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fifo_frames_t framesDesired = mFramesPerBurst;
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if (!allowUnderflow && fullFrames < framesDesired) {
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framesDesired = fullFrames; // just use what is available then stop
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}
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// Mix data in one or two parts.
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int partIndex = 0;
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int32_t framesLeft = framesDesired;
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while (framesLeft > 0 && partIndex < WrappingBuffer::SIZE) {
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fifo_frames_t framesToMixFromPart = framesLeft;
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fifo_frames_t framesAvailableFromPart = wrappingBuffer.numFrames[partIndex];
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if (framesAvailableFromPart > 0) {
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if (framesToMixFromPart > framesAvailableFromPart) {
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framesToMixFromPart = framesAvailableFromPart;
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}
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mixPart(destination, (float *)wrappingBuffer.data[partIndex],
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framesToMixFromPart);
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destination += framesToMixFromPart * mSamplesPerFrame;
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framesLeft -= framesToMixFromPart;
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}
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partIndex++;
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}
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fifo->advanceReadIndex(framesDesired);
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#if AAUDIO_MIXER_ATRACE_ENABLED
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ATRACE_END();
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#endif /* AAUDIO_MIXER_ATRACE_ENABLED */
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return (framesDesired - framesLeft); // framesRead
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}
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void AAudioMixer::mixPart(float *destination, float *source, int32_t numFrames) {
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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++;
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}
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}
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float *AAudioMixer::getOutputBuffer() {
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return mOutputBuffer.get();
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}
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