Merge "A2DP encoding host: implement data position"

// Invoked by audio server when it has audio data to stream.

bool StartRequest() {

  // Reset total read bytes and timestamp to avoid confusing audio

  // server at delay calculation.

  total_bytes_read_ = 0;

  data_position_ = {0, 0};

  // Check if a previous request is not finished

  if (a2dp_pending_cmd_ == A2DP_CTRL_CMD_START) {

    LOG(INFO) << __func__ << ": A2DP_CTRL_CMD_START in progress";

void end_session() {

  // TODO: Notify server; or do we handle it during disconnected?

  // Reset remote delay. New value will be set when new session starts.

  remote_delay_report_ = 0;

}

void ack_stream_started(const tA2DP_CTRL_ACK& ack) {

// Read from the FMQ of BluetoothAudio HAL

size_t read(uint8_t* p_buf, uint32_t len) {

  uint32_t bytes_read = 0;

  if (a2dp_uipc == nullptr) {

    return 0;

  }

  return UIPC_Read(*a2dp_uipc, UIPC_CH_ID_AV_AUDIO, p_buf, len);

  bytes_read = UIPC_Read(*a2dp_uipc, UIPC_CH_ID_AV_AUDIO, p_buf, len);

  total_bytes_read_ += bytes_read;

  // MONOTONIC_RAW isn't affected by NTP, audio stack rely on this

  // to get precise delay calculation.

  clock_gettime(CLOCK_MONOTONIC_RAW, &data_position_);

  return bytes_read;

}

}  // namespace a2dp