text: /*
   * 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 "AudioProcessorBase.h"
  #include "SinkI24.h"
  
  #if FLOWGRAPH_ANDROID_INTERNAL
  #include <audio_utils/primitives.h>
  #endif
  
  using namespace flowgraph;
  
  SinkI24::SinkI24(int32_t channelCount)
          : AudioSink(channelCount) {}
  
  int32_t SinkI24::read(int64_t framePosition, void *data, int32_t numFrames) {
      uint8_t *byteData = (uint8_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(framePosition, framesLeft);
          if (framesRead <= 0) {
              break;
          }
          const float *floatData = input.getBuffer();
          int32_t numSamples = framesRead * channelCount;
  #if FLOWGRAPH_ANDROID_INTERNAL
          memcpy_to_p24_from_float(byteData, floatData, numSamples);
          static const int kBytesPerI24Packed = 3;
          byteData += numSamples * kBytesPerI24Packed;
          floatData += numSamples;
  #else
          const int32_t kI24PackedMax = 0x007FFFFF;
          const int32_t kI24PackedMin = 0xFF800000;
          for (int i = 0; i < numSamples; i++) {
              int32_t n = (int32_t) (*floatData++ * 0x00800000);
              n = std::min(kI24PackedMax, std::max(kI24PackedMin, n)); // clip
              // Write as a packed 24-bit integer in Little Endian format.
              *byteData++ = (uint8_t) n;
              *byteData++ = (uint8_t) (n >> 8);
              *byteData++ = (uint8_t) (n >> 16);
          }
  #endif
          framesLeft -= framesRead;
          framePosition += framesRead;
      }
      return numFrames - framesLeft;
  }
  