# playSound returns ERR\_INVALID\_POSITION for user created stream.
**URL:** https://qa.fmod.com/t/playsound-returns-err-invalid-position-for-user-created-stream/12678
**Category:** Unity
**Created:** [September 4, 2016, 6:20am UTC](https://qa.fmod.com/t/playsound-returns-err-invalid-position-for-user-created-stream/12678 "2016-09-04T06:20:59Z")
**Posts on this page:** 6
**Page:** 1
### Author:  [@r618](https://qa.fmod.com/u/r618)
#### Post date: [September 4, 2016, 6:20am UTC](https://qa.fmod.com/t/playsound-returns-err-invalid-position-for-user-created-stream/12678/1 "2016-09-04T06:20:59Z")
Hi,
I’m trying to replicate `user_created_sound` low level cpp sample in Unity, but getting error from %subj%.
I have
`...`
`FMOD.CREATESOUNDEXINFO exinfo = new FMOD.CREATESOUNDEXINFO();`
`exinfo.numchannels = 2;`
`exinfo.defaultfrequency = 44100;`
`exinfo.decodebuffersize = 44100;`
`exinfo.length = (uint)( exinfo.defaultfrequency * exinfo.numchannels * 2 * 5 ); // 2 == sizeof(short) or Int16 or two bytes per sample in channel`
`exinfo.format = FMOD.SOUND_FORMAT.PCM16;`
`exinfo.pcmreadcallback = this.pcmreadcallback;`
`exinfo.pcmsetposcallback = this.pcmsetposcallback;`
`result = system.createSound( "", FMOD.MODE.OPENUSER | FMOD.MODE.CREATESTREAM, ref exinfo, out sound);`
`// here result == FMOD.RESULT.OK`
`result = system.playSound(sound, null, false, out channel);`
`// here result == FMOD.RESULT.ERR_INVALID_POSITION`
`...`
Both callbacks defined as specified by respective delegate get called from/by `createSound` with proper parameters… , but playSound always fails with seeking error ( no callbacks, obviously, are called afterwards ); is this an overlook in the c# wrapper / unity plugin, or am I doing something very stupid ?
Thanks!
---
### Author:  [@nick1](https://qa.fmod.com/u/nick1)
#### Post date: [September 5, 2016, 2:25am UTC](https://qa.fmod.com/t/playsound-returns-err-invalid-position-for-user-created-stream/12678/2 "2016-09-05T02:25:41Z")
> [@](#):
>
> Hi,
>
> I’m trying to replicate `user_created_sound` low level cpp sample in Unity, but getting error from %subj%.
> I have
>
> `...`
> `FMOD.CREATESOUNDEXINFO exinfo = new FMOD.CREATESOUNDEXINFO();`
> `exinfo.numchannels = 2;`
> `exinfo.defaultfrequency = 44100;`
> `exinfo.decodebuffersize = 44100;`
> `exinfo.length = (uint)( exinfo.defaultfrequency * exinfo.numchannels * 2 * 5 ); // 2 == sizeof(short) or Int16 or two bytes per sample in channel`
> `exinfo.format = FMOD.SOUND_FORMAT.PCM16;`
> `exinfo.pcmreadcallback = this.pcmreadcallback;`
> `exinfo.pcmsetposcallback = this.pcmsetposcallback;`
>
> `result = system.createSound( "", FMOD.MODE.OPENUSER | FMOD.MODE.CREATESTREAM, ref exinfo, out sound);`
> `// here result == FMOD.RESULT.OK`
>
> `result = system.playSound(sound, null, false, out channel);`
> `// here result == FMOD.RESULT.ERR_INVALID_POSITION `
> `...`
>
> Both callbacks defined as specified by respective delegate get called from/by `createSound` with proper parameters… , but playSound always fails with seeking error ( no callbacks, obviously, are called afterwards ); is this an overlook in the c# wrapper / unity plugin, or am I doing something very stupid ?
>
> Thanks!
See [http://www.fmod.org/documentation/#content/generated/engine\_new\_unity/script\_example\_timeline.html](http://www.fmod.org/documentation/#content/generated/engine_new_unity/script_example_timeline.html) for example of using C# callbacks and avoiding GC issues. Please update with the content of the callbacks if you’re still having issues.
---
### Author:  [@r618](https://qa.fmod.com/u/r618)
#### Post date: [September 5, 2016, 4:05am UTC](https://qa.fmod.com/t/playsound-returns-err-invalid-position-for-user-created-stream/12678/3 "2016-09-05T04:05:07Z")
Thanks, but still the same result / the callbacks are (for testing) empty, just returning immediately:
`[AOT.MonoPInvokeCallback(typeof(FMOD.SOUND_PCMREADCALLBACK))]`
`FMOD.RESULT PCMReadCallback(System.IntPtr soundraw, System.IntPtr data, uint datalen) {`
`return FMOD.RESULT.OK;`
`}`
`[AOT.MonoPInvokeCallback(typeof(FMOD.SOUND_PCMSETPOSCALLBACK))]`
`FMOD.RESULT PCMSetPosCallback(System.IntPtr soundraw, int subsound, uint position, FMOD.TIMEUNIT postype)`
`{`
`return FMOD.RESULT.OK;`
`}`
`FMOD.SOUND_PCMREADCALLBACK pcmreadcallback;`
`FMOD.SOUND_PCMSETPOSCALLBACK pcmsetposcallback;`
`void Start() {`
`this.pcmreadcallback = new FMOD.SOUND_PCMREADCALLBACK(PCMReadCallback);`
`this.pcmsetposcallback = new FMOD.SOUND_PCMSETPOSCALLBACK(PCMSetPosCallback);`
`FMOD.CREATESOUNDEXINFO exinfo = new FMOD.CREATESOUNDEXINFO();`
`...`
`}`
both of them are called by `createSound`, but `playSound` still returns ERR\_INVALID\_POSITION
( empty read callback just for testing, when it has its body:
`float t1 = 0, t2 = 0; // time`
`float v1 = 0, v2 = 0; // velocity`
`[AOT.MonoPInvokeCallback(typeof(FMOD.SOUND_PCMREADCALLBACK))]`
`FMOD.RESULT PCMReadCallback(System.IntPtr soundraw, System.IntPtr data, uint datalen)`
`{`
`for (int count = 0; count < (datalen >> 2); count++) // >>2 = 16bit stereo (4 bytes per sample)`
`{`
`System.Runtime.InteropServices.Marshal.WriteInt16(data, 0, (short)(Mathf.Sin(t1) * 32767f));`
`System.Runtime.InteropServices.Marshal.WriteInt16(data, 1, (short)(Mathf.Sin(t2) * 32767f));`
`t1 += 0.01f + v1;`
`t2 += 0.0142f + v2;`
`v1 += (float)(Mathf.Sin(t1) * 0.002f);`
`v2 += (float)(Mathf.Sin(t2) * 0.002f);`
`}`
`return FMOD.RESULT.OK;`
`}`
the result is still the same )
---
### Author:  [@r618](https://qa.fmod.com/u/r618)
#### Post date: [September 5, 2016, 4:07am UTC](https://qa.fmod.com/t/playsound-returns-err-invalid-position-for-user-created-stream/12678/4 "2016-09-05T04:07:08Z")
( sorry about the formatting, apparently it isn’t recognized in the comment / )
---
### Author:  [@nick1](https://qa.fmod.com/u/nick1)
#### Post date: [September 5, 2016, 5:28am UTC](https://qa.fmod.com/t/playsound-returns-err-invalid-position-for-user-created-stream/12678/5 "2016-09-05T05:28:29Z")
There’s a bug in the C# API wrapper. The fix will be released in 1.08.11.
You can see the fix here:
>
---
### Author:  [@r618](https://qa.fmod.com/u/r618)
#### Post date: [September 5, 2016, 5:56am UTC](https://qa.fmod.com/t/playsound-returns-err-invalid-position-for-user-created-stream/12678/6 "2016-09-05T05:56:48Z")
> [@](#):
>
> There’s a bug in the C# API wrapper. The fix will be released in 1.08.11.
>
> You can see the fix here:
> [Fix marshalling of CREATESOUNDEXINFO · fmod/fmod-for-unity@12849c2 · GitHub](https://github.com/fmod/UnityIntegration/commit/12849c22cab51af82c1b21ba6b3e624c81447307)
Thanks for the info and link !