Android Mediecodec Hard Decode mp3,wma

1MedieCodec supports more than 4.1 system use, is a class of Google SDK.

2 ability to decode MP3,WMA format audio files

3 before decoding, need mediaexactor extract file information, including file type, sample rate,

Package Com.dawin.mediacodec;import Java.io.ioexception;import Java.nio.bytebuffer;import Android.media.MediaCodec ; import Android.media.mediaextractor;import Android.media.mediaformat;import android.media.MediaCodec.BufferInfo; public class mediacodectest{byte[] Decodedata = new byte[1024 * 1024x768 * 20];//20mMediaCodec Mmediacodec; Mediaextractor Mediaextractor; Mediaformat mmediaformat;final int timeout_us = 1000; Bufferinfo Info;boolean Sawoutputeos = False;boolean Sawinputeos = false; Bytebuffer[] codecinputbuffers; Bytebuffer[] codecoutputbuffers;/** * Decode the audio file, return the last decoded data * * @param URL * @return */public byte[] decode (String url) {url = ""; Try{mediaextractor.setdatasource (URL);} catch (IOException e) {}mmediaformat = Mediaextractor.gettrackformat (0); String mime = mmediaformat.getstring (mediaformat.key_mime); try{mmediacodec = Mediacodec.createdecoderbytype (MIME);} catch (IOException e) {//TODO auto-generated catch Blocke.printstacktrace ();} Mmediacodec.configure (Mmediaformat, NULL, NULL, 0); MMEdiacodec.start (); codecinputbuffers = Mmediacodec.getinputbuffers (); codecoutputbuffers = Mmediacodec.getoutputbuffers (); info = new Bufferinfo (); mediaextractor.selecttrack (0); input (); output (); return Decodedata;} private void Output () {Final int res = Mmediacodec.dequeueoutputbuffer (info, timeout_us); if (res >= 0) {int Outputbufind ex = res; Bytebuffer buf = codecoutputbuffers[outputbufindex];final byte[] Chunk = new Byte[info.size];buf.get (chunk); Read the buffer all at oncebuf.clear (); * * MUST do!!! OTHERWISE the NEXT time you GET this//same BUFFER bad things would happenif (Chunk.length > 0) {system.arraycopy (chunk, 0, Decodedata, 0, chunk.length);//Maudiotrack.write (chunk, 0, chunk.length);} Mmediacodec.releaseoutputbuffer (Outputbufindex, FALSE/* render */); if (Info.flags & Mediacodec.buffer_flag_end_ Of_stream)! = 0) {Sawoutputeos = true;}} else if (res = = mediacodec.info_output_buffers_changed) {codecoutputbuffers = Mmediacodec.getoutputbuffers ();} else if ( res = = Mediacodec.info_output_format_changed) {final Mediaformat Oformat = Mmediacodec.getoutputformat ();//LOG.D (Log_tag, "OUTPUT Format has changed to "+ Oformat);//Maudiotrack.setplaybackrate (Oformat.getinteger (Mediaformat.key_sample_rate));}} private void input () {int inputbufindex = Mmediacodec.dequeueinputbuffer (Timeout_us); if (inputbufindex >= 0) { Bytebuffer Dstbuf = Codecinputbuffers[inputbufindex];int samplesize = mediaextractor.readsampledata (dstBuf, 0);// LOG.I (Log_tag, "samplesize:" +samplesize); Long Presentationtimeus = 0;if (SampleSize < 0) {//. LOG.I (Log_tag, "Saw input end of stream!"); Sawinputeos = true;samplesize = 0;} Else{presentationtimeus = Mediaextractor.getsampletime ();//LOG.I (Log_tag, "Presentationtimeus" +presentationTimeUs );} Mmediacodec.queueinputbuffer (inputbufindex,0,//Offsetsamplesize, Presentationtimeus,sawinputeos?) mediacodec.buffer_flag_end_of_stream:0), if (!sawinputeos) {//LOG.I (Log_tag, "extractor.advance ()"); Mediaextractor.advance ();}}}

Android Mediecodec Hard Decode mp3,wma