| /* |
| * 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. |
| */ |
| |
| #include <algorithm> |
| #include <unistd.h> |
| #include "flowgraph/FlowGraphNode.h" |
| #include "SourceI24Caller.h" |
| |
| #if FLOWGRAPH_ANDROID_INTERNAL |
| #include <audio_utils/primitives.h> |
| #endif |
| |
| using namespace oboe; |
| using namespace flowgraph; |
| |
| int32_t SourceI24Caller::onProcess(int32_t numFrames) { |
| int32_t numBytes = mStream->getBytesPerFrame() * numFrames; |
| int32_t bytesRead = mBlockReader.read((uint8_t *) mConversionBuffer.get(), numBytes); |
| int32_t framesRead = bytesRead / mStream->getBytesPerFrame(); |
| |
| float *floatData = output.getBuffer(); |
| const uint8_t *byteData = mConversionBuffer.get(); |
| int32_t numSamples = framesRead * output.getSamplesPerFrame(); |
| |
| #if FLOWGRAPH_ANDROID_INTERNAL |
| memcpy_to_float_from_p24(floatData, byteData, numSamples); |
| #else |
| static const float scale = 1. / (float)(1UL << 31); |
| for (int i = 0; i < numSamples; i++) { |
| // Assemble the data assuming Little Endian format. |
| int32_t pad = byteData[2]; |
| pad <<= 8; |
| pad |= byteData[1]; |
| pad <<= 8; |
| pad |= byteData[0]; |
| pad <<= 8; // Shift to 32 bit data so the sign is correct. |
| byteData += kBytesPerI24Packed; |
| *floatData++ = pad * scale; // scale to range -1.0 to 1.0 |
| } |
| #endif |
| |
| return framesRead; |
| } |