# Fade out and pause issue **URL:** \ **Category:** FMOD Engine\ **Tags:** cpp\ **Created:** [April 17, 2021, 8:52pm UTC](https://qa.fmod.com/t/fade-out-and-pause-issue/17066 "2021-04-17T20:52:04Z")\ **Posts on this page:** 5\ **Page:** 1
**Author:** ![joshechoes](https://yyz2.discourse-cdn.com/flex036/user_avatar/qa.fmod.com/joshechoes/32/558_2.png) [@joshechoes](https://qa.fmod.com/u/joshechoes)\ **Post date:** [April 17, 2021, 8:52pm UTC](https://qa.fmod.com/t/fade-out-and-pause-issue/17066/1 "2021-04-17T20:52:04Z")
I am trying to work out how to fade out and pause the sound, then unpause it. I customised the basic ‘3d’ example (for iOS) with this code: ``` if (Common_BtnPress(BTN_ACTION2)) { bool paused; channel2->setVolume(1.0); channel2->setPaused(false); channel2->setDelay(0, 0); ERRCHECK(result); } if (Common_BtnPress(BTN_MORE)) { unsigned long long parentclock; channel2->getDSPClock(nullptr, &parentclock); unsigned long long fadepoint = parentclock + 44100; channel2->addFadePoint(parentclock, 1.0); channel2->addFadePoint(fadepoint, 0.0); channel2->setDelay(0, fadepoint, false); } ``` As you can see, the ‘B’ button unpauses the sound. (I also paused everything to begin with. The ‘E’ button fades out and sets a delay for pausing the sound. Both those actions On pressing the ‘B’ button again, it doesn’t unpause it. I read in the documentation > False: When dspclock\_end is reached, behaves like ChannelControl::setPaused has been called, a subsequent dspclock\_start allows it to resume. …but I don’t fully understand what it’s asking me to do. I’ve tried lots of combinations of `setDelay` but it won’t unpause. Any help would be greatly appreciated. ---
**Author:** ![joshechoes](https://yyz2.discourse-cdn.com/flex036/user_avatar/qa.fmod.com/joshechoes/32/558_2.png) [@joshechoes](https://qa.fmod.com/u/joshechoes)\ **Post date:** [April 19, 2021, 4:42pm UTC](https://qa.fmod.com/t/fade-out-and-pause-issue/17066/2 "2021-04-19T16:42:00Z")
Some further digging. In order to unpause a sound which has been paused with `addFadePoint` and `setDelay`, you have to have another call to _both_ `addFadePoint` and `setDelay`, like this. ``` unsigned long long dspclock; unsigned long long parentclock; channel2->getDSPClock(&dspclock, &parentclock); channel2->addFadePoint(parentclock, 1.0f); channel2->setDelay(0, 0, false); channel2->setPaused(false); ``` However, I am still stuck here because pausing a sound like this: ``` unsigned long long parentclock; channel2->getDSPClock(nullptr, &parentclock); unsigned long long fadepoint = parentclock + 132300; channel2->addFadePoint(parentclock, 1.0); channel2->addFadePoint(fadepoint, 0.0); channel2->setDelay(0, fadepoint, false); ``` A subsequent call to `getPaused` (after the fade) returns `false` (incorrect, as it should have paused with the `setDelay` call?) …and a call to `isPlaying` returns `true`. So how do we tell when we’ve paused a sound after fading? ---
**Author:** ![joshechoes](https://yyz2.discourse-cdn.com/flex036/user_avatar/qa.fmod.com/joshechoes/32/558_2.png) [@joshechoes](https://qa.fmod.com/u/joshechoes)\ **Post date:** [April 20, 2021, 8:49am UTC](https://qa.fmod.com/t/fade-out-and-pause-issue/17066/3 "2021-04-20T08:49:21Z")
I figured it out, but be prepared for a very circuitous answer. This functions just checks if a sound is actively playing on the channel. We have to check: 1. if the channel is ‘playing’ (active) 2. if the sound is paused 3. if there are any delays set 4. if there are any future fade points ### code ``` bool isPlaying() { // check if the channel is inactive bool isplaying = false; result = channel->isPlaying(&isplaying); if ((result != FMOD_OK) && (result != FMOD_ERR_INVALID_HANDLE)) { LOGE("fmod:: Error getting isPlaying status because: %s\n", FMOD_ErrorString(result)); } if (!isplaying) { return false; } // check if the sound is paused bool paused = true; result = channel->getPaused(&paused); if (paused) { return false; } // check for scheduled fades unsigned long long dspclock_start = 0; unsigned long long dspclock_end = 0; result = channel->getDelay(&dspclock_start, &dspclock_end, 0); if ((result != FMOD_OK) && (result != FMOD_ERR_INVALID_HANDLE)) { LOGE("fmod:: Error getting delay because: %s\n", FMOD_ErrorString(result)); } if (dspclock_start > 0 || dspclock_end > 0) { // it's set to either play in the future or stop in the future // or a fade has been performed // if a fade's been performed, there won't be any fade points // need to check if there's an active fade unsigned int numpoints; result = channel->getFadePoints(&numpoints, 0, 0); if ((result != FMOD_OK) && (result != FMOD_ERR_INVALID_HANDLE)) { LOGE("fmod:: Error getting fade points because: %s\n", FMOD_ErrorString(result)); } if (numpoints) { // we're in a fade return true; } return false; } return true; } ``` In the documentation it states for the `stopchannels` argument that: > False: When `dspclock_end` is reached, behaves like [ChannelControl::setPaused](https://www.fmod.com/resources/documentation-api?version=2.1&page=core-api-channelcontrol.html#channelcontrol_setpaused) has been called, a subsequent `dspclock_start` allows it to resume. However, the word ‘like’ here encapsulates quite a lot of assumptions, and quite a bit of extra code to actually figure out what the state of the channel is. It’s difficult to work out if it’s actually playing sound or not if `setDelay` and/or `addFadePoints` has been called. I hope this may help others in the future when they’re trying to work out if a sound has completed fading, has been paused with `setDelay` or has been manually paused with `setPaused`. ---
**Author:** ![cameron-fmod](https://yyz2.discourse-cdn.com/flex036/user_avatar/qa.fmod.com/cameron-fmod/32/261_2.png) [@cameron-fmod](https://qa.fmod.com/u/cameron-fmod)\ **Post date:** [April 23, 2021, 6:00am UTC](https://qa.fmod.com/t/fade-out-and-pause-issue/17066/4 "2021-04-23T06:00:05Z")
[ChannelControl::isPlaying](https://fmod.com/resources/documentation-api?version=2.2&page=core-api-channelcontrol.html#channelcontrol_isplaying) is working as intended, calling play on a sound means it is ‘playing’ until it is stopped. Even if it is paused it is still ‘playing’. > A [Channel](https://fmod.com/resources/documentation-api?version=2.2&page=core-api-channel.html) is considered playing after [System::playSound](https://fmod.com/resources/documentation-api?version=2.2&page=core-api-system.html#system_playsound) or [System::playDSP](https://fmod.com/resources/documentation-api?version=2.2&page=core-api-system.html#system_playdsp), even if it is paused. You could also use [`ChannelControl::getAudibility`](https://fmod.com/resources/documentation-api?version=2.2&page=core-api-channelcontrol.html#channelcontrol_getaudibility) which goes to zero when delayed and paused and should be one for everything else. ---
**Author:** ![joshechoes](https://yyz2.discourse-cdn.com/flex036/user_avatar/qa.fmod.com/joshechoes/32/558_2.png) [@joshechoes](https://qa.fmod.com/u/joshechoes)\ **Post date:** [April 23, 2021, 9:05am UTC](https://qa.fmod.com/t/fade-out-and-pause-issue/17066/5 "2021-04-23T09:05:27Z")
Thanks for the reply, and the tip about `getAudibility` - that’s helpful. The issue I had was that the call to `setDelay` did not pause it. Even though the sound had ‘paused’ when it came to the clock time, calling `setPaused(false)` did not unpause it. You had to check if there was a delay set using `getDelay` then unset it using `setDelay(0, 0)`. Then `setVolume` did not work, because of the previous fade point. You had to check if there were fade points set using `getFadePoints`, then remove them and set another fade point at the volume you wanted. It sounds like `getAudibility` might circumvent all of this, though! Thanks 🙂