c++ - RtAudio - Playing samples from wav file -

i trying learn audio programming. goal open wav file, extract , play samples rtaudio.

i made waveloader class let's me extract samples , meta data. used this guide , checked correct 010 editor. here snapshot of 010 editor showing structure , data.

and how store raw samples inside waveloader class:

        data = new short[wave_data.payloadsize]; // - allocates memory size of chunk size          if (!fread(data, 1, wave_data.payloadsize, sound_file))         {             throw ("could not read wav data");         } 

if print out each sample : 1, -3, 4, -5 ... seems ok.

the problem not sure how can play them. i've done:

/*  * using portaudio play samples  */ bool player::play()  {     showdevices();     rt.showwarnings(true);      rtaudio::streamparameters oparameters; //, iparameters;     oparameters.deviceid = rt.getdefaultoutputdevice();     oparameters.firstchannel = 0;     oparameters.nchannels = maudio.channels;      //iparameters.deviceid = rt.getdefaultinputdevice();     //iparameters.nchannels = 2;      unsigned int samplerate = maudio.samplerate;      // use buffer of 512, need feed callback 512 bytes everytime!     unsigned int nbufferframes = 512;      rtaudio::streamoptions options;     options.flags = rtaudio_schedule_realtime;     options.flags = rtaudio_noninterleaved;      //&parameters, null, rtaudio_float64,samplerate, &bufferframes, &mcallback, (void *)&rawdata      try {         rt.openstream(&oparameters, null, rtaudio_sint16, samplerate, &nbufferframes, &mcallback, (void*) &maudio);         rt.startstream();     }     catch (rtaudioerror& e) {         std::cout << e.getmessage() << std::endl;         return false;     }     return true; }  /* * rtaudio callback * */ int mcallback(void * outputbuffer, void * inputbuffer, unsigned int nbufferframes, double streamtime, rtaudiostreamstatus status, void * userdata) {     unsigned int = 0;     short *out = static_cast<short*>(outputbuffer);     auto *data = static_cast<player::audio_data*>(userdata);      // if more our data size, done!     if (i > data->datasize) return 1;      // first time callback called data->ptr 0, means offset 0     // second time data->ptr 1, means offset = nbufferframes (512) * 1 = 512     unsigned int offset = nbufferframes * data->ptr++;      printf("offset: %i\n", offset);     // first time callback called offset 0, starting 0 , looping nbufferframes (512) times, gives 512 bytes     // second time, offset 1, starting 512 bytes , looping 512 + 512 = 1024      (i = offset; < offset + nbufferframes; ++i)     {         short sample = data->rawdata[i]; // raw sample our struct         *out++ = sample;                // pass output buffer playback          printf("current sample value: %i\n", sample);       // showing 1, -3, 4, -5 check 010 editor     }      printf("current time: %f\n", streamtime);     return 0; } 

inside callback function, when print out sample values 010 editor? why isnt rtaudio playing them. wrong here? need normalize sample values between -1 , 1?

edit: wav file trying play:

• chunksize: 16
• format: 1
• channel: 1
• samplerate: 48000
• byterate: 96000
• blockalign: 2
• bitpersample: 16
• size of raw samples total: 2217044 bytes

for reason works when pass input parameters openstream()

    rtaudio::streamparameters oparameters, iparameters;     oparameters.deviceid = rt.getdefaultoutputdevice();     oparameters.firstchannel = 0;     //oparameters.nchannels = maudio.channels;     oparameters.nchannels = maudio.channels;      iparameters.deviceid = rt.getdefaultinputdevice();     iparameters.nchannels = 1;      unsigned int samplerate = maudio.samplerate;      // use buffer of 512, need feed callback 512 bytes everytime!     unsigned int nbufferframes = 512;      rtaudio::streamoptions options;     options.flags = rtaudio_schedule_realtime;     options.flags = rtaudio_noninterleaved;      //&parameters, null, rtaudio_float64,samplerate, &bufferframes, &mcallback, (void *)&rawdata      try {         rt.openstream(&oparameters, &iparameters, rtaudio_sint16, samplerate, &nbufferframes, &mcallback, (void*) &maudio);         rt.startstream();     }     catch (rtaudioerror& e) {         std::cout << e.getmessage() << std::endl;         return false;     }     return true; 

it random when trying playback mic. left input parameters , wav file playing. bug?