Merge "AudioFlinger: fix unique ID generation after crash" into sc-dev

      mDeviceEffectManager(this),

      mSystemReady(false)

{

    // Move the audio session unique ID generator start base as time passes to limit risk of

    // generating the same ID again after an audioserver restart.

    // This is important because clients will reuse previously allocated audio session IDs

    // when reconnecting after an audioserver restart and newly allocated IDs may conflict with

    // active clients.

    // Moving the base by 1 for each elapsed second is a good compromise between avoiding overlap

    // between allocation ranges and not reaching wrap around too soon.

    timespec ts{};

    clock_gettime(CLOCK_MONOTONIC, &ts);

    // zero ID has a special meaning, so start allocation at least at AUDIO_UNIQUE_ID_USE_MAX

    uint32_t sessionBase = (uint32_t)std::max((long)1, ts.tv_sec);

    // unsigned instead of audio_unique_id_use_t, because ++ operator is unavailable for enum

    for (unsigned use = AUDIO_UNIQUE_ID_USE_UNSPECIFIED; use < AUDIO_UNIQUE_ID_USE_MAX; use++) {

        // zero ID has a special meaning, so unavailable

        mNextUniqueIds[use] = AUDIO_UNIQUE_ID_USE_MAX;

        mNextUniqueIds[use] =

                ((use == AUDIO_UNIQUE_ID_USE_SESSION) ? sessionBase : 1) * AUDIO_UNIQUE_ID_USE_MAX;

    }

#if 1