Recherche avancée

Sur d’autres sites (6029)

• dsputil : Fix "warning : initialization discards const qualifier from pointer target...

  2 avril 2013, par Michael Niedermayer

  dsputil : Fix "warning : initialization discards const qualifier from pointer target...

• Revision 01e4e0b11d : Merge "Code cleanup in block reconstruction code." into experimental

  2 avril 2013, par John Koleszar

  Merge "Code cleanup in block reconstruction code." into experimental

• I wonder why logcat says "NO SUCH A FILE OR DIRECTORY(2)"

  22 septembre 2013, par autoexebat

  I wanna play audio on Android with ffmpeg.
  But when I run this project, error has occurred

  what should I do ?

  java SIDE

  import java.io.FileNotFoundException;
  
  import java.io.FileOutputStream;
  
  import java.io.IOException;
  
  import android.app.Activity;
  
  import android.media.AudioFormat;
  
  import android.media.AudioManager;
  
  import android.media.AudioTrack;
  
  import android.media.MediaPlayer;
  
  import android.os.Bundle;
  
  import android.os.SystemClock;
  
  
  
  public class FFmpegBasic extends Activity
  
  {
  
      private AudioTrack track;
  
      private FileOutputStream os;
  
      /** Called when the activity is first created. */
  
      @Override
  
      public void onCreate(Bundle savedInstanceState)
  
      {
  
          super.onCreate(savedInstanceState);
  
          setContentView(R.layout.main);
  
          createEngine();
  
  
  
          int bufSize = AudioTrack.getMinBufferSize(44100,
  
                                                    AudioFormat.CHANNEL_CONFIGURATION_STEREO, 
  
                                                    AudioFormat.ENCODING_PCM_16BIT);
  
  
  
  
  
          track = new AudioTrack(AudioManager.STREAM_MUSIC, 
  
                                 44100, 
  
                                 AudioFormat.CHANNEL_CONFIGURATION_STEREO, 
  
                                 AudioFormat.ENCODING_PCM_16BIT, 
  
                                 bufSize,
  
                                 AudioTrack.MODE_STREAM);
  
  
  
          byte[] bytes = new byte[bufSize];
  
  
  
          try {
  
              os = new FileOutputStream("/sdcard/a.out",false);
  
          } catch (FileNotFoundException e) {
  
              // TODO Auto-generated catch block
  
              e.printStackTrace();
  
          }
  
  
  
          String result = "/mnt/sdcard/Wildlife.mp3";
  
          loadFile(result,bytes);
  
  
  
          try {
  
              os.close();
  
          } catch (IOException e) {
  
              // TODO Auto-generated catch block
  
              e.printStackTrace();
  
          }
  
      }
  
  
  
      void playSound(byte[] buf, int size) {  
  
          if(track.getPlayState()!=AudioTrack.PLAYSTATE_PLAYING)
  
              track.play();
  
          track.write(buf, 0, size);
  
  
  
          try {
  
              os.write(buf,0,size);
  
          } catch (IOException e) {
  
              // TODO Auto-generated catch block
  
              e.printStackTrace();
  
          }
  
      }
  
  
  
  
  
      private native void createEngine();
  
      private native void loadFile(String file, byte[] array);
  
  
  
      /** Load jni .so on initialization*/ 
  
      static {
  
           System.loadLibrary("avutil"); 
  
           System.loadLibrary("avcore"); 
  
           System.loadLibrary("avcodec");
  
           System.loadLibrary("avformat");
  
           System.loadLibrary("avdevice");
  
           System.loadLibrary("swscale");
  
           System.loadLibrary("avfilter");
  
           System.loadLibrary("ffmpeg");
  
           System.loadLibrary("basicplayer");
  
      }
  
  }

  ---

  c SIDE

  ---

  #include 
  
  #include 
  
  #include 
  
  #include <android></android>log.h>
  
  
  
  #include "libavcodec/avcodec.h"
  
  #include "libavformat/avformat.h"
  
  #include "avcodec.h"
  
  #include "avformat.h"
  
  
  
  
  
  
  
  
  
  void Java_net_jbong_FFmpegBasic_FFmpegBasic_createEngine(JNIEnv* env, jclass clazz)
  
      {
  
          //avcodec_init();
  
  
  
          av_register_all();
  
  
  
  
  
      }
  
  
  
  void Java_net_jbong_FFmpegBasic_FFmpegBasic_loadFile(JNIEnv* env, jobject obj, jstring file, jbyteArray array)
  
  {
  
  
  
      AVFormatContext *gFormatCtx = NULL;
  
      AVCodecContext *gAudioCodecCtx = NULL;
  
      AVCodec *gAudioCodec = NULL;
  
      int gAudioStreamIdx = -1;
  
      char *gAudioBuffer = NULL;
  
      int i, outsize = 0;
  
      AVPacket packet;
  
      const char *str; 
  
      str = (*env)->GetStringUTFChars(env, file, NULL); 
  
      jclass cls = (*env)->GetObjectClass(env, obj); 
  
      jmethodID play = (*env)->GetMethodID(env, cls, "playSound", "([BI)V"); 
  
  
  
      if (gFormatCtx != NULL)
  
          return -1;
  
      if (av_open_input_file(&amp;gFormatCtx,str,NULL,0,NULL)!=0)
  
          return -2;
  
      if (av_find_stream_info(gFormatCtx) &lt; 0)
  
          return -3;
  
  
  
      for(i=0; inb_streams; i++)
  
      {
  
          if(gFormatCtx->streams[i]->codec->codec_type == AVMEDIA_TYPE_AUDIO)
  
          {
  
              gAudioStreamIdx = i;
  
              break;
  
          }
  
      }
  
  
  
      if (gAudioStreamIdx == -1)
  
          return -4;
  
      gAudioCodecCtx = gFormatCtx->streams[gAudioStreamIdx]->codec;
  
      gAudioCodec = avcodec_find_decoder(gAudioCodecCtx->codec_id);
  
  
  
      if (gAudioCodec == NULL)
  
          return -5;
  
  
  
      if (avcodec_open(gAudioCodecCtx, gAudioCodec)&lt;0)
  
          return -6;
  
  
  
  
  
      gAudioBuffer = (char *)av_malloc(AVCODEC_MAX_AUDIO_FRAME_SIZE *2); 
  
      int decode = 0;
  
  
  
      while (av_read_frame(gFormatCtx, &amp;packet) >= 0)
  
      {
  
       if (gFormatCtx-> streams[packet.stream_index]->codec->codec_type == AVMEDIA_TYPE_AUDIO)
  
       {
  
           int data_size = AVCODEC_MAX_AUDIO_FRAME_SIZE * 8; 
  
           gAudioBuffer = (char *)av_malloc(data_size);
  
           int size=packet.size;
  
           while(size > 0)
  
           {
  
            int len = avcodec_decode_audio3(gAudioCodecCtx,
  
              (short *) gAudioBuffer, &amp;data_size, &amp;packet);
  
            if (data_size > 0)
  
            {
  
                      jbyte *bytes = (*env)->GetByteArrayElements(env, array, NULL);
  
                         memcpy(bytes + decode, (int16_t *)gAudioBuffer, size);
  
                         (*env)->ReleaseByteArrayElements(env, array, bytes, 0);
  
                         (*env)->CallVoidMethod(env, obj, play, array, data_size); 
  
                         decode += size;
  
                         size -= len;
  
  
  
            }
  
           }
  
       }
  
       av_free_packet(&amp;packet);
  
      }
  
  
  
      av_close_input_file(gFormatCtx);
  
      return 0;
  
  }

  Why my android logcat show me this message ?
  "error opening trace file : No such file or directory (2)"