1*05767d91SRobert Wu /* 2*05767d91SRobert Wu * Copyright 2019 The Android Open Source Project 3*05767d91SRobert Wu * 4*05767d91SRobert Wu * Licensed under the Apache License, Version 2.0 (the "License"); 5*05767d91SRobert Wu * you may not use this file except in compliance with the License. 6*05767d91SRobert Wu * You may obtain a copy of the License at 7*05767d91SRobert Wu * 8*05767d91SRobert Wu * http://www.apache.org/licenses/LICENSE-2.0 9*05767d91SRobert Wu * 10*05767d91SRobert Wu * Unless required by applicable law or agreed to in writing, software 11*05767d91SRobert Wu * distributed under the License is distributed on an "AS IS" BASIS, 12*05767d91SRobert Wu * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13*05767d91SRobert Wu * See the License for the specific language governing permissions and 14*05767d91SRobert Wu * limitations under the License. 15*05767d91SRobert Wu */ 16*05767d91SRobert Wu 17*05767d91SRobert Wu #include <algorithm> 18*05767d91SRobert Wu #include <unistd.h> 19*05767d91SRobert Wu #include "flowgraph/FlowGraphNode.h" 20*05767d91SRobert Wu #include "SourceI24Caller.h" 21*05767d91SRobert Wu 22*05767d91SRobert Wu #if FLOWGRAPH_ANDROID_INTERNAL 23*05767d91SRobert Wu #include <audio_utils/primitives.h> 24*05767d91SRobert Wu #endif 25*05767d91SRobert Wu 26*05767d91SRobert Wu using namespace oboe; 27*05767d91SRobert Wu using namespace flowgraph; 28*05767d91SRobert Wu onProcess(int32_t numFrames)29*05767d91SRobert Wuint32_t SourceI24Caller::onProcess(int32_t numFrames) { 30*05767d91SRobert Wu int32_t numBytes = mStream->getBytesPerFrame() * numFrames; 31*05767d91SRobert Wu int32_t bytesRead = mBlockReader.read((uint8_t *) mConversionBuffer.get(), numBytes); 32*05767d91SRobert Wu int32_t framesRead = bytesRead / mStream->getBytesPerFrame(); 33*05767d91SRobert Wu 34*05767d91SRobert Wu float *floatData = output.getBuffer(); 35*05767d91SRobert Wu const uint8_t *byteData = mConversionBuffer.get(); 36*05767d91SRobert Wu int32_t numSamples = framesRead * output.getSamplesPerFrame(); 37*05767d91SRobert Wu 38*05767d91SRobert Wu #if FLOWGRAPH_ANDROID_INTERNAL 39*05767d91SRobert Wu memcpy_to_float_from_p24(floatData, byteData, numSamples); 40*05767d91SRobert Wu #else 41*05767d91SRobert Wu static const float scale = 1. / (float)(1UL << 31); 42*05767d91SRobert Wu for (int i = 0; i < numSamples; i++) { 43*05767d91SRobert Wu // Assemble the data assuming Little Endian format. 44*05767d91SRobert Wu int32_t pad = byteData[2]; 45*05767d91SRobert Wu pad <<= 8; 46*05767d91SRobert Wu pad |= byteData[1]; 47*05767d91SRobert Wu pad <<= 8; 48*05767d91SRobert Wu pad |= byteData[0]; 49*05767d91SRobert Wu pad <<= 8; // Shift to 32 bit data so the sign is correct. 50*05767d91SRobert Wu byteData += kBytesPerI24Packed; 51*05767d91SRobert Wu *floatData++ = pad * scale; // scale to range -1.0 to 1.0 52*05767d91SRobert Wu } 53*05767d91SRobert Wu #endif 54*05767d91SRobert Wu 55*05767d91SRobert Wu return framesRead; 56*05767d91SRobert Wu } 57