text: /*
   * Copyright (C) 2012 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.
   */
  
  #define LOG_TAG "AudioStreamInSource"
  //#define LOG_NDEBUG 0
  
  #include <cutils/compiler.h>
  #include <utils/Log.h>
  #include <media/nbaio/AudioStreamInSource.h>
  
  namespace android {
  
  AudioStreamInSource::AudioStreamInSource(audio_stream_in *stream) :
          NBAIO_Source(),
          mStream(stream),
          mStreamBufferSizeBytes(0),
          mFramesOverrun(0),
          mOverruns(0)
  {
      ALOG_ASSERT(stream != NULL);
  }
  
  AudioStreamInSource::~AudioStreamInSource()
  {
  }
  
  ssize_t AudioStreamInSource::negotiate(const NBAIO_Format offers[], size_t numOffers,
                                        NBAIO_Format counterOffers[], size_t& numCounterOffers)
  {
      if (!Format_isValid(mFormat)) {
          mStreamBufferSizeBytes = mStream->common.get_buffer_size(&mStream->common);
          audio_format_t streamFormat = mStream->common.get_format(&mStream->common);
          uint32_t sampleRate = mStream->common.get_sample_rate(&mStream->common);
          audio_channel_mask_t channelMask =
                  (audio_channel_mask_t) mStream->common.get_channels(&mStream->common);
          mFormat = Format_from_SR_C(sampleRate,
                  audio_channel_count_from_in_mask(channelMask), streamFormat);
          mFrameSize = Format_frameSize(mFormat);
      }
      return NBAIO_Source::negotiate(offers, numOffers, counterOffers, numCounterOffers);
  }
  
  int64_t AudioStreamInSource::framesOverrun()
  {
      uint32_t framesOverrun = mStream->get_input_frames_lost(mStream);
      if (framesOverrun > 0) {
          mFramesOverrun += framesOverrun;
          // FIXME only increment for contiguous ranges
          ++mOverruns;
      }
      return mFramesOverrun;
  }
  
  ssize_t AudioStreamInSource::read(void *buffer, size_t count)
  {
      if (CC_UNLIKELY(!Format_isValid(mFormat))) {
          return NEGOTIATE;
      }
      ssize_t bytesRead = mStream->read(mStream, buffer, count * mFrameSize);
      if (bytesRead > 0) {
          size_t framesRead = bytesRead / mFrameSize;
          mFramesRead += framesRead;
          return framesRead;
      } else {
          return bytesRead;
      }
  }
  
  }   // namespace android
  