iphone - Accessing raw audio data with Audio Queue using AudioFileReadPackets -

-

i'm attempting access raw audio data sent audio queue callback, after calling audiofilereadpackets, number of bytes (numbytes) 0. 

void aqrecorder::myinputbufferhandler(void *inuserdata, audioqueueref inaq, audioqueuebufferref inbuffer, const audiotimestamp * instarttime, uint32 innumpackets, const audiostreampacketdescription* inpacketdesc) {  aqrecorder *aqr = (aqrecorder *)inuserdata;  try {     if (innumpackets > 0) {          //read packets         uint32 numbytes;          osstatus result = audiofilereadpackets(aqr->mrecordfile,      // audio file packets of audio data read.                                                false,                   // set true cache data. otherwise, set false.                                                &numbytes,               // on output, pointer number of bytes returned.                                                (__bridge audiostreampacketdescription*)inpacketdesc,    // pointer array of packet descriptions have been allocated.                                                aqr->mrecordpacket,  // packet index of first packet want returned.                                                &innumpackets,               // on input, pointer number of packets read. on output, number of packets read.                                                                                           inbuffer->maudiodata); // pointer user-allocated memory.          inbuffer->maudiodatabytesize = numbytes;                sint16 *testbuffer = (sint16*)inbuffer->maudiodata;          (int i=0; < numbytes; i++)         {             uint16 currentdata = testbuffer[i];             printf("current data in testbuffer %d", currentdata);         }      // if we're not stopping, re-enqueue buffe gets filled again     if (aqr->isrunning())         xthrowiferror(audioqueueenqueuebuffer(inaq, inbuffer, 0, null), "audioqueueenqueuebuffer failed"); } catch (caxexception e) {     char buf[256];     fprintf(stderr, "error: %s (%s)\n", e.moperation, e.formaterror(buf)); } }

i able values between 0 , 4294967296 when print out first index of testbuffer, not seem empty. ideas why numbytes 0 after audiofilereadpackets executes?

i'm still unsure why numbytes 0, found workable solution this question.

to size of testbuffer used following code: 

int samplecount = inbuffer->maudiodatabytescapacity / sizeof(sint16);

Comments

Post a Comment

Popular posts from this blog

c# - SVN Error : "svnadmin: E205000: Too many arguments" -

-
i trying reposotries using c# code process svncommand = null; var psi = new processstartinfo("svnadmin"); psi.redirectstandardoutput = true; psi.redirectstandarderror = true; psi.useshellexecute = false; psi.arguments= @"dump c:\repositories\myrepo > c:\temp\myrepodumpfile.dump"; using (svncommand = process.start(psi)) { var myoutput = svncommand.standardoutput; var myerror = svncommand.standarderror; debug.write("output :" + environment.newline + environment.newline + myoutput.readtoend() + environment.newline + "error :" + environment.newline + environment.newline + myerror.readtoend()); svncommand.close(); } when use dump command commandline svnadmin dump c:\repositories\myrepo > c:\temp\myrepodumpfile.dump it works fine when try ...
Read more

c++ - Using OpenSSL in a multi-threaded application -

-
i have been writing soap client application in c++ on ubuntu using openssl https transport , pthreads threading. have number of threads - 1 central data acquisition thread periodically gets worker threads make soap requests via shared mutex protected queues. reading documentation openssl found is openssl thread-safe? in openssl faq describes mechanisms required ensure thread safety when using openssl. implemented , works fine. the reason question conceptual difficulty really. thinking implementing same functionality application has already, instead of using threads, create 2 seperate applications : 1 worker thread (of multiple copies running) , main data acquisition thread. use tcp sockets communicate between 2 rather mutex protected queues. may bad idea not important - confusing me would have implement same functions required ensure openssl thread safety in second approach or not? my guess not have , treated independent (indeed surely must many applications use openssl) re...
Read more

All overlapping substrings matching a java regex -

-
is there api method returns (possibly overlapping) substrings match regular expression? for example, have text string: string t = 04/31 412-555-1235; , , have pattern: pattern p = new pattern("\\d\\d+"); matches strings of 2 or more characters. the matches are: 04, 31, 412, 555, 1235. how overlapping matches? i want code return: 04, 31, 41, 412, 12, 55, 555, 55, 12, 123, 1235, 23, 235, 35. theoretically should possible -- there obvious o(n^2) algorithm enumerates , checks substrings against pattern. edit rather enumerating substrings, safer use region(int start, int end) method in matcher . checking pattern against separate, extracted substring might change result of match (e.g. if there non-capturing group or word boundary check @ start/end of pattern). edit 2 actually, it's unclear whether region() expect zero-width matches. specification vague, , experiments yield disappointing results. for example: string line = "xx90xx"; strin...
Read more