ebiten/audio/internal/oboe/oboe_flowgraph_SinkI16_android.cpp

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/*
* Copyright 2018 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.
*/
#include <algorithm>
#include <unistd.h>
#include "oboe_flowgraph_SinkI16_android.h"
#if FLOWGRAPH_ANDROID_INTERNAL
#include <audio_utils/primitives.h>
#endif
using namespace FLOWGRAPH_OUTER_NAMESPACE::flowgraph;
SinkI16::SinkI16(int32_t channelCount)
: FlowGraphSink(channelCount) {}
int32_t SinkI16::read(void *data, int32_t numFrames) {
int16_t *shortData = (int16_t *) data;
const int32_t channelCount = input.getSamplesPerFrame();
int32_t framesLeft = numFrames;
while (framesLeft > 0) {
// Run the graph and pull data through the input port.
int32_t framesRead = pullData(framesLeft);
if (framesRead <= 0) {
break;
}
const float *signal = input.getBuffer();
int32_t numSamples = framesRead * channelCount;
#if FLOWGRAPH_ANDROID_INTERNAL
memcpy_to_i16_from_float(shortData, signal, numSamples);
shortData += numSamples;
signal += numSamples;
#else
for (int i = 0; i < numSamples; i++) {
int32_t n = (int32_t) (*signal++ * 32768.0f);
*shortData++ = std::min(INT16_MAX, std::max(INT16_MIN, n)); // clip
}
#endif
framesLeft -= framesRead;
}
return numFrames - framesLeft;
}