android - What are lib_k3_generic_audio_extractor.so, lib_k3_mov_extractor.so, and so on? -

i'm experimenting android mediacodec, code got here: https://code.google.com/p/android-source-browsing.platform--cts

when tried run code "android-source-browsing.platform--cts/tests/tests/media/src/android/media/cts/decodertest.java", got these errors:

d/android.media.cts.decodertest(6615): decode(): master = 2131034134 d/android.media.cts.decodertest(6615): decode(): masterfd = {assetfiledescriptor: {parcelfiledescriptor: filedescriptor[50]} start=1781867 len=529200} d/android.media.cts.decodertest(6615): decode(): masterlength = 529200 d/android.media.cts.decodertest(6615): decode(): = android.content.res.assetfiledescriptor$autocloseinputstream@417592a0 d/android.media.cts.decodertest(6615): decode(): bis = java.io.bufferedinputstream@41759368 i/extractorloader(6615): register extractor  [lib_k3_avi_extractor.so] e/extractorloader(6615): open [lib_k3_mov_extractor.so] failed! e/extractorloader(6615): open [lib_k3_flv_extractor.so] failed! i/extractorloader(6615): register extractor  [lib_k3_m2ts_extractor.so] e/extractorloader(6615): open [lib_k3_asf_extractor.so] failed! e/extractorloader(6615): open [lib_k3_generic_audio_extractor.so] failed! d/android.media.cts.decodertest(6615): decode(): testassetfd = {assetfiledescriptor: {parcelfiledescriptor: filedescriptor[50]} start=1591735 len=49318} d/android.media.cts.decodertest(6615): decode(): testfd = filedescriptor[50] d/android.media.cts.decodertest(6615): decode(): trackcount = 1 d/android.media.cts.decodertest(6615): decode(): filelength = 49318 d/android.media.cts.decodertest(6615): decode(): format = {durationus=3056326, encoder-padding=1908, channel-count=2, encoder-delay=576, mime=audio/mpeg, sample-rate=44100} d/android.media.cts.decodertest(6615): decode(): mime = audio/mpeg 

apparently libraries lib_k3_avi_extractor.so, lib_k3_mov_extractor.so, etc, not in device. here questions: these libraries? for? why not in device? googled these libraries, strangely search came absolutely nothing.

the java code generated errors listed below, minor changes add log information:

private void decode(int testinput, int master, float maxerror) throws ioexception {     // read master file memory     assetfiledescriptor masterfd = mresources.openrawresourcefd(master);     long masterlength = masterfd.getlength();  //in bytes?     short[] masterbuffer = new short[(int)(masterlength/2)];     inputstream = masterfd.createinputstream();     bufferedinputstream bis = new bufferedinputstream(is);     log.d(tag, "decode(): master = " + master);     log.d(tag, "decode(): masterfd = " + masterfd);     log.d(tag, "decode(): masterlength = " + masterlength);     log.d(tag, "decode(): = " + is);     log.d(tag, "decode(): bis = " + bis);      (int = 0; < masterbuffer.length; i++) {         int lo = bis.read();         int hi = bis.read();         if (hi >= 128) {             hi -= 256;         }         int sample = hi * 256 + lo;         masterbuffer[i] = (short) sample;     }     bis.close();      mediaextractor extractor;     mediacodec codec;     bytebuffer[] codecinputbuffers;     bytebuffer[] codecoutputbuffers;      assetfiledescriptor testassetfd = mresources.openrawresourcefd(testinput);     filedescriptor testfd = testassetfd.getfiledescriptor();     extractor = new mediaextractor();     extractor.setdatasource(testfd, testassetfd.getstartoffset(), testassetfd.getlength());     //assertequals("wrong number of tracks", 1, extractor.gettrackcount());     mediaformat format = extractor.gettrackformat(0);     string mime = format.getstring(mediaformat.key_mime);     //asserttrue("not audio file", mime.startswith("audio/"));     log.d(tag, "decode(): testassetfd = " + testassetfd);     log.d(tag, "decode(): testfd = " + testfd);     log.d(tag, "decode(): trackcount = " + extractor.gettrackcount());     log.d(tag, "decode(): filelength = " + testassetfd.getlength());     log.d(tag, "decode(): format = " + format);     log.d(tag, "decode(): mime = " + mime);      codec = mediacodec.createdecoderbytype(mime);     codec.configure(format, null /* surface */, null /* crypto */, 0 /* flags */);     codec.start();     codecinputbuffers = codec.getinputbuffers();     codecoutputbuffers = codec.getoutputbuffers();      extractor.selecttrack(0);      // start decoding     int numbytesdecoded = 0;     int maxdelta = 0;     long totalerrorsquared = 0;     final long ktimeoutus = 5000;     mediacodec.bufferinfo info = new mediacodec.bufferinfo();     boolean sawinputeos = false;     boolean sawoutputeos = false;     while (!sawoutputeos) {         if (!sawinputeos) {              // transfer control of input buffer codec java code             int inputbufindex = codec.dequeueinputbuffer(ktimeoutus);             if (inputbufindex >= 0) {                 bytebuffer dstbuf = codecinputbuffers[inputbufindex];                  // fill input buffer data                 int samplesize = extractor.readsampledata(dstbuf, 0 /* offset */);                 long presentationtimeus = 0;                  if (samplesize < 0) {                     log.d(tag, "saw input eos.");                     sawinputeos = true;                     samplesize = 0;                 } else {                     presentationtimeus = extractor.getsampletime();                 }                  // let codec control input buffer again                 codec.queueinputbuffer(                         inputbufindex,                         0 /* offset */,                         samplesize,                         presentationtimeus,                         sawinputeos ? mediacodec.buffer_flag_end_of_stream : 0);                  if (!sawinputeos) {                     extractor.advance();                 }             }         }          int res = codec.dequeueoutputbuffer(info, ktimeoutus);          if (res >= 0) {             int outputbufindex = res;             bytebuffer buf = codecoutputbuffers[outputbufindex];              // check waveform matches within specified max error             (int = 0; < info.size; += 2) {                 short sample = buf.getshort(i);                 int idx = (numbytesdecoded + i) / 2;                 //asserttrue("decoder returned data", idx < masterbuffer.length);                 short mastersample = masterbuffer[idx];                 int d = sample - mastersample;                 totalerrorsquared += d * d;             }              numbytesdecoded += info.size;              codec.releaseoutputbuffer(outputbufindex, false /* render */);              if ((info.flags & mediacodec.buffer_flag_end_of_stream) != 0) {                 log.d(tag, "saw output eos.");                 sawoutputeos = true;             }         } else if (res == mediacodec.info_output_buffers_changed) {             codecoutputbuffers = codec.getoutputbuffers();              log.d(tag, "output buffers have changed.");         } else if (res == mediacodec.info_output_format_changed) {             mediaformat oformat = codec.getoutputformat();              log.d(tag, "output format has changed " + oformat);         }     }      codec.stop();     codec.release();     testassetfd.close();     masterfd.close();      //assertequals("wrong data size", masterlength, numbytesdecoded);     long avgerrorsquared = (totalerrorsquared / (numbytesdecoded / 2));     double rmse = math.sqrt(avgerrorsquared);      //asserttrue("decoding error big: " + rmse, rmse <= maxerror); }