Save recorded audio to file - OpenSL ES - Android -

i'm trying record microphone, add effects, , save file

i've started example native-audio included in android ndk. i'va managed add reverb , play haven't found examples or on how accomplish this.

any , welcome.

opensl not framework file formats , access. if want raw pcm file, open writing , put buffers opensl callback file. if want encoded audio, need own codec , format handler. can use ffmpeg libraries, or built-in stagefright.

update write playback buffers local raw pcm file

we start native-audio-jni.c

#include <stdio.h> file* rawfile = null; int bclosing = 0; 

...

void bqplayercallback(slandroidsimplebufferqueueitf bq, void *context) {     assert(bq == bqplayerbufferqueue);     assert(null == context);     // streaming playback, replace test logic find , fill next buffer     if (--nextcount > 0 && null != nextbuffer && 0 != nextsize) {         slresult result;         // enqueue buffer         result = (*bqplayerbufferqueue)->enqueue(bqplayerbufferqueue, nextbuffer, nextsize);         // other result sl_result_buffer_insufficient,         // code example indicate programming error         assert(sl_result_success == result);         (void)result;          // alexc: here write:         if (rawfile) {             fwrite(nextbuffer, nextsize, 1, rawfile);         }     }     if (bclosing) { // important in callback, on correct thread         fclose(rawfile);         rawfile = null;     }     // alexc: end of changes } 

...

void java_com_example_nativeaudio_nativeaudio_startrecording(jnienv* env, jclass clazz) {     bclosing = 0;     rawfile = fopen("/sdcard/rawfile.pcm", "wb"); 

...

void java_com_example_nativeaudio_nativeaudio_shutdown(jnienv* env, jclass clazz) {     bclosing = 1; 

...