Merge "Prevent divide by zero in WAVExtractor"

                        1000000LL * (mDataSize / 65 * 320) / 8000;

                } else {

                    size_t bytesPerSample = mBitsPerSample >> 3;

                    if (!bytesPerSample || !mNumChannels)

                        return ERROR_MALFORMED;

                    size_t num_samples = mDataSize / (mNumChannels * bytesPerSample);

                    if (!mSampleRate)

                        return ERROR_MALFORMED;

                    durationUs =

                        1000000LL * (mDataSize / (mNumChannels * bytesPerSample))

                            / mSampleRate;

                        1000000LL * num_samples / mSampleRate;

                }

                mTrackMeta->setInt64(kKeyDuration, durationUs);