Merge "Add a conditional wait for file switching in MPEG4Writer." into main am: 2e9ef55e

static const int64_t kMaxMetadataSize = 0x4000000LL;   // 64MB max per-frame metadata size

static const int64_t kMaxCttsOffsetTimeUs = 30 * 60 * 1000000LL;  // 30 minutes

static const size_t kESDSScratchBufferSize = 10;  // kMaxAtomSize in Mpeg4Extractor 64MB

// Allow up to 100 milli second, which is safely above the maximum delay observed in manual testing

// between posting from setNextFd and handling it

static const int64_t kFdCondWaitTimeoutNs = 100000000;

static const char kMetaKey_Version[]    = "com.android.version";

static const char kMetaKey_Manufacturer[]      = "com.android.manufacturer";

        return OK;

    }

    // Wait for the signal only if the new file is not available.

    if (mNextFd == -1) {

        status_t res = mFdCond.waitRelative(mLock, kFdCondWaitTimeoutNs);

        if (res != OK) {

            ALOGW("No FileDescriptor for next recording");

            return INVALID_OPERATION;

        }

    }

    mSwitchPending = true;

    sp<AMessage> msg = new AMessage(kWhatSwitch, mReflector);

        return INVALID_OPERATION;

    }

    mNextFd = dup(fd);

    mFdCond.signal();

    return OK;

}

    std::mutex mFallocMutex;

    bool mPreAllocFirstTime; // Pre-allocate space for file and track headers only once per file.

    uint64_t mPrevAllTracksTotalMetaDataSizeEstimate;

    Condition mFdCond;

    List<Track *> mTracks;