mirror of
https://github.com/hajimehoshi/ebiten.git
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65 lines
2.1 KiB
C++
Vendored
65 lines
2.1 KiB
C++
Vendored
/*
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* Copyright 2018 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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#include <algorithm>
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#include <unistd.h>
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#if FLOWGRAPH_ANDROID_INTERNAL
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#include <audio_utils/primitives.h>
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#endif
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#include "oboe_flowgraph_FlowGraphNode_android.h"
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#include "oboe_flowgraph_SourceI24_android.h"
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using namespace FLOWGRAPH_OUTER_NAMESPACE::flowgraph;
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constexpr int kBytesPerI24Packed = 3;
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SourceI24::SourceI24(int32_t channelCount)
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: FlowGraphSourceBuffered(channelCount) {
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}
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int32_t SourceI24::onProcess(int32_t numFrames) {
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float *floatData = output.getBuffer();
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int32_t channelCount = output.getSamplesPerFrame();
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int32_t framesLeft = mSizeInFrames - mFrameIndex;
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int32_t framesToProcess = std::min(numFrames, framesLeft);
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int32_t numSamples = framesToProcess * channelCount;
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const uint8_t *byteBase = (uint8_t *) mData;
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const uint8_t *byteData = &byteBase[mFrameIndex * channelCount * kBytesPerI24Packed];
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#if FLOWGRAPH_ANDROID_INTERNAL
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memcpy_to_float_from_p24(floatData, byteData, numSamples);
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#else
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static const float scale = 1. / (float)(1UL << 31);
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for (int i = 0; i < numSamples; i++) {
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// Assemble the data assuming Little Endian format.
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int32_t pad = byteData[2];
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pad <<= 8;
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pad |= byteData[1];
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pad <<= 8;
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pad |= byteData[0];
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pad <<= 8; // Shift to 32 bit data so the sign is correct.
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byteData += kBytesPerI24Packed;
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*floatData++ = pad * scale; // scale to range -1.0 to 1.0
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}
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#endif
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mFrameIndex += framesToProcess;
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return framesToProcess;
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} |