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• Audio playing back at the wrong speed using FFmpeg on Android

  11 avril 2019, par Kyborg2011

  General problem in the following :
  I decode the audio as follows :

  ReSampleContext* rsc = av_audio_resample_init(
  
          1, aCodecCtx->channels,
  
          aCodecCtx->sample_rate, aCodecCtx->sample_rate,
  
          av_get_sample_fmt("u8"), aCodecCtx->sample_fmt,
  
          16, 10, 0, 1);
  
  
  
  while (av_read_frame(pFormatCtx, &packet)>= 0) {
  
      if (aCodecCtx->codec_type == AVMEDIA_TYPE_AUDIO) {
  
          int data_size = AVCODEC_MAX_AUDIO_FRAME_SIZE * 2;
  
          int size=packet.size;
  
          int decoded = 0;
  
  
  
           while(size > 0) {
  
               int len = avcodec_decode_audio3(aCodecCtx, pAudioBuffer, 
  
                   &data_size, &packet);
  
  
  
               //Сonvert audio to sample 8bit
  
               out_size = audio_resample(rsc, outBuffer, pAudioBuffer, len);
  
  
  
               jbyte *bytes = (*env)->GetByteArrayElements(env, array, NULL);
  
  
  
               memcpy(bytes, outBuffer, out_size);
  
               (*env)->ReleaseByteArrayElements(env, array, bytes, 0);
  
               (*env)->CallStaticVoidMethod(env, cls, mid, array, out_size, number);
  
  
  
               size -= len;
  
               number++;
  
           }
  
       }
  
   }

  Next release it AudioTrack. After that, I hear that song that was necessary, but with noise and speed of 2 times larger. In what may be the problem ?

  UPDATE :
  This is Java code :

  public static AudioTrack track;
  
  public static byte[] bytes;
  
  protected void onCreate(Bundle savedInstanceState) {
  
      super.onCreate(savedInstanceState);
  
      setContentView(R.layout.main);
  
      int bufSize = 2048;
  
      track = new AudioTrack(AudioManager.STREAM_MUSIC, 44100, AudioFormat.CHANNEL_OUT_MONO, 
  
                  AudioFormat.ENCODING_PCM_8BIT, bufSize, AudioTrack.MODE_STREAM); 
  
  
  
      bytes = new byte[bufSize];
  
      Thread mAudioThread = new Thread(new Runnable() {
  
          public void run() {
  
              int res = main(2, "/sdcard/muzika_iz_reklami_bmw_5_series_-_bmw_5_series.mp3", bytes);
  
              System.out.println(res);
  
          } 
  
      });
  
      mAudioThread.setPriority(Thread.MAX_PRIORITY);
  
      mAudioThread.start(); 
  
  }
  
  
  
  private static void play(byte[] play, int length, int p) {
  
      if (p==0){
  
          track.play();
  
      }
  
      track.write(play, 0, length); 
  
  }

• avcodec/nvenc : only unregister input resources when absolutely needed

  24 avril 2019, par Timo Rothenpieler

  avcodec/nvenc : only unregister input resources when absolutely needed
  This reverts nvenc to old behaviour, which in some super rare edge cases
  
  performs better.
  
  The implication of this is that any potential API user who relies on
  
  nvenc cleaning up every frames device resources after it's done using
  
  them will have to change their usage pattern.
  That should not be a problem, since pretty much every normal usage
  
  pattern automatically implies that surfaces are reused from a common
  
  pool, since constant re-allocation is also very expensive.
  

  • [DH] libavcodec/nvenc.c

• How to decrypt hls video content

  16 mai 2019, par SHAH MD MONIRUL ISLAM

  My requirement is to play the encrypted hls video files from local storage in android. I have used NanoHTTPD to create and run the local server. From there I am serving the .ts an .m3u8 files. To play this video ExoPlayer need a key to decrypt the files and thus I made a url : http://localhost:4990/dataKey.

  Here is my local server class :

  import android.os.Environment;
  
  import android.util.Log;
  
  
  
  import java.io.File;
  
  import java.io.FileInputStream;
  
  import java.io.FileNotFoundException;
  
  import java.util.Map;
  
  
  
  import fi.iki.elonen.NanoHTTPD;
  
  
  
  public class LocalStreamingServer extends NanoHTTPD{
  
      public LocalStreamingServer(int port){
  
          super(port);
  
  
  
      }
  
  
  
      @Override
  
      public Response serve(IHTTPSession session){
  
          Log.e("req", session.getUri());
  
  
  
          if(session.getUri().equalsIgnoreCase("/dataKey")){
  
  
  
              return newFixedLengthResponse(Response.Status.OK, "txt", "what is the key?");
  
          }
  
  
  
          if(session.getUri().contains("m3u8")){
  
              String path = Environment.getExternalStorageDirectory().toString() + "/s3" + session.getUri();
  
  
  
              FileInputStream fis = null;
  
              File f = new File(path);
  
              try {
  
                  fis = new FileInputStream(f);
  
              } catch (FileNotFoundException e) {
  
              }
  
              return newFixedLengthResponse(Response.Status.OK, "m3u8", fis, f.length());
  
          }
  
  
  
          if(session.getUri().endsWith("ts")){
  
              String path = Environment.getExternalStorageDirectory().toString() + "/s3" + session.getUri();
  
  
  
              FileInputStream fis = null;
  
              File f = new File(path);
  
              try {
  
                  fis = new FileInputStream(f);
  
              } catch (FileNotFoundException e) {
  
  
  
              }
  
              return newFixedLengthResponse(Response.Status.OK, "ts", fis, f.length());
  
          }
  
  
  
          String path = Environment.getExternalStorageDirectory().toString() + "/s3/master.m3u8";
  
  
  
          FileInputStream fis = null;
  
          File f = new File(path);
  
          try {
  
              fis = new FileInputStream(f);
  
          } catch (FileNotFoundException e) {
  
          }
  
          return newFixedLengthResponse(Response.Status.OK, "m3u8", fis, f.length());
  
      }
  
  }

  I have transcoded the video using ffmpeg. I need to know that which data or key need to be returned when the dataKey url is called. I have the encrypted the video using these key :

  key=617D8A125A284DF48E3C6B1866348A3F
  
  IV=5ff82ce11c7e73dcdf7e73cacd0ef98

  I can not understand which of them are need to be returned from the datakey url. Both of them are not working. Exoplayer is sending the error message :java.security.InvalidKeyException: Unsupported key size

  can Any one help me about this ?