ios9 - m4a audio files not playing on iOS 9 -

i have audio related app has multichannel mixer play m4a files @ time. i'm using audiotoolbox framework stream audio, on ios9 framework throws me exception in mixer rendering callback streaming audio files.

interestingly apps compiled ios9 sdk continue stream same file on ios7/8 devices, not ios9. can't figure out if apple broke in ios9, or have files encoded wrong on our end, play fine on both ios 7/8 not 9.

exception:

malloc: *** error object 0x7fac74056e08: incorrect checksum freed object - object modified after being freed. *** set breakpoint in malloc_error_break debug 

it works other formats not give exception or kind of memory errors not work m4a format surprising.

here code load files works wav,aif etc formats not m4a:

- (void)loadfiles{      avaudioformat *clientformat = [[avaudioformat alloc] initwithcommonformat:avaudiopcmformatfloat32                                                                    samplerate:kgraphsamplerate                                                                      channels:1                                                                   interleaved:no];     (int = 0; < numfiles && < maxbufs; i++)  {          extaudiofileref xafref = 0;          // open 1 of 2 source files         osstatus result = extaudiofileopenurl(sourceurl[i], &xafref);         if (result || !xafref) {break; }          // file data format, represents file's actual data format         audiostreambasicdescription fileformat;         uint32 propsize = sizeof(fileformat);          result = extaudiofilegetproperty(xafref, kextaudiofileproperty_filedataformat, &propsize, &fileformat);         if (result) { break; }          // set client format - format want extaudiofile , corresponds format         // providing input callback of mixer, therefore data type must same          double rateratio = kgraphsamplerate / fileformat.msamplerate;          propsize = sizeof(audiostreambasicdescription);         result = extaudiofilesetproperty(xafref, kextaudiofileproperty_clientdataformat, propsize, clientformat.streamdescription);         if (result) { break; }          // file's length in sample frames         uint64 numframes = 0;         propsize = sizeof(numframes);         result = extaudiofilegetproperty(xafref, kextaudiofileproperty_filelengthframes, &propsize, &numframes);         if (result) { break; }          if(i==metronomebusindex)             numframes = (numframes+6484)*4;         //numframes = (numframes * rateratio); // account sample rate conversion         numframes *= rateratio;           // set our buffer         msoundbuffer[i].numframes = (uint32)numframes;         msoundbuffer[i].asbd = *(clientformat.streamdescription);          uint32 samples = (uint32)numframes * msoundbuffer[i].asbd.mchannelsperframe;         msoundbuffer[i].data = (float32 *)calloc(samples, sizeof(float32));         msoundbuffer[i].samplenum = 0;          // set audiobufferlist read data         audiobufferlist buflist;         buflist.mnumberbuffers = 1;         buflist.mbuffers[0].mnumberchannels = 1;         buflist.mbuffers[0].mdata = msoundbuffer[i].data;         buflist.mbuffers[0].mdatabytesize = samples * sizeof(float32);          // perform synchronous sequential read of audio data out of file our allocated data buffer         uint32 numpackets = (uint32)numframes;          result = extaudiofileread(xafref, &numpackets, &buflist);         if (result) {             free(msoundbuffer[i].data);             msoundbuffer[i].data = 0;         }          // close file , dispose extaudiofileref         extaudiofiledispose(xafref);     }      // [clientformat release]; } 

if point me in right direction, how go debugging issue? need re-encode our files in specific way?

i tried on ios 9.1.beta3 yesterday , things seem normal.

try out. let know if works out too.