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  • Decoding Video using FFMpeg for android

    29 novembre 2014, par Rahul Upadhyay

    I tried to decode video using FFMpeg library from the sample examples available on internet, i figure it out with new version of ffmpeg,
    here is the code which I called from my class file,

       private static native int decodeVideo(String filename);
    
   decodeVideo(getString(R.string._sdcard_abc_3gp));

    now in .c file located in JNI dir,I wrote this code,

     jint Java_ru_dzakhov_ffmpeg_test_MainActivity_decodeVideo(JNIEnv* env, jobject
    
javaThis,jstring filename) {   
    
  AVFormatContext *pFormatCtx;
    
  int             i, videoStream;
    
  AVCodecContext  *pCodecCtx;
    
  AVCodec         *pCodec;
    
  AVFrame         *pFrame;
    
  AVFrame         *pFrameRGB;
    
  AVPacket        packet;
    
  int             frameFinished;
    
  int             numBytes;
    
  uint8_t         *buffer;
    

    
  // Register all formats and codecs
    
  av_register_all();
    

    
  // Open video file
    

    
      const jbyte *str;
    
      str = (*env)->GetStringUTFChars(env, filename, NULL);
    

    
      if(av_open_input_file(&pFormatCtx, str, NULL, 0, NULL)!=0)
    
      {
    
          LOGI("Can't open file '%s'\n", str);
    
          return 1;
    
      }
    
      else
    
      {
    
          LOGI("File is opened\n");
    
          LOGI("File '%s', Codec %s",pFormatCtx->filename,pFormatCtx->iformat->name);
    
      }
    

    

    
  // Dump information about file onto standard error
    

    
  LOGI("dump_format");
    
  dump_format(pFormatCtx, 0, filename, 0);
    
  LOGI("dump_format DONE");
    
  // Find the first video stream
    
  videoStream=-1;
    
  for(i=0; inb_streams; i++)
    
    if(pFormatCtx->streams[i]->codec->codec_type==CODEC_TYPE_VIDEO)
    
      //if(pFormatCtx->streams[i]->codec->codec_type==AVMEDIA_TYPE_VIDEO)
    
      {
    
          LOGI("videoStream:: %d",videoStream);
    
      videoStream=i;
    
      break;
    
    }
    
  if(videoStream==-1)
    
    return -1; // Didn't find a video stream
    

    
  // Get a pointer to the codec context for the video stream
    
  pCodecCtx=pFormatCtx->streams[videoStream]->codec;
    

    
  // Find the decoder for the video stream
    
  pCodec=avcodec_find_decoder(pCodecCtx->codec_id);
    
  if(pCodec==NULL) {
    
    fprintf(stderr, "Unsupported codec!\n");
    
    LOGI("Unsupported codec!\n");
    
    return -1; // Codec not found
    
  }
    
  // Open codec
    
  if(avcodec_open(pCodecCtx, pCodec)<0){
    
      LOGI("Codec Opened!\n");
    
    return -1; // Could not open codec
    
  }
    
  // Allocate video frame
    
  pFrame=avcodec_alloc_frame();
    

    
  // Allocate an AVFrame structure
    
  pFrameRGB=avcodec_alloc_frame();
    
  if(pFrameRGB==NULL){
    

    
      LOGI("checking --->>> pFrameRGB==NULL\n");
    
    return -1;
    
  }
    
  // Determine required buffer size and allocate buffer
    

    
  LOGI("Determine required buffer size and allocate buffer\n");
    
  numBytes=avpicture_get_size(PIX_FMT_RGB24, pCodecCtx->width,
    
                              pCodecCtx->height);
    

    
  LOGI("numBytes %d",numBytes);
    

    
  buffer=(uint8_t *)av_malloc(numBytes*sizeof(uint8_t));
    

    
  // Assign appropriate parts of buffer to image planes in pFrameRGB
    
  // Note that pFrameRGB is an AVFrame, but AVFrame is a superset
    
  // of AVPicture
    
  avpicture_fill((AVPicture *)pFrameRGB, buffer, PIX_FMT_RGB24,
    
                 pCodecCtx->width, pCodecCtx->height);
    

    
  // Read frames and save first five frames to disk
    
  i=0;
    
  while(av_read_frame(pFormatCtx, &packet)>=0) {
    
    // Is this a packet from the video stream?
    
    if(packet.stream_index==videoStream) {
    
      // Decode video frame
    
        avcodec_decode_video2(pCodecCtx, pFrame, &frameFinished,&packet);
    
                           //packet.data, packet.size);
    

    
      // Did we get a video frame?
    
      if(frameFinished) {
    
        // Convert the image from its native format to RGB
    
        /*Temporarily down
    
         *
    
         * img_convert((AVPicture *)pFrameRGB, PIX_FMT_RGB24,
    
                    (AVPicture*)pFrame, pCodecCtx->pix_fmt, pCodecCtx->width,pCodecCtx->height);*/
    

    
        // Save the frame to phone memory
    
          LOGI("Saving Frame\n");
    
         SaveFrame(pFrameRGB, pCodecCtx->width, pCodecCtx->height, ++i);
    
         LOGI("After Saving Frame\n");
    
      }
    
    }
    

    
    // Free the packet that was allocated by av_read_frame
    
    av_free_packet(&packet);
    
  }
    

    
  // Free the RGB image
    
  av_free(buffer);
    
  av_free(pFrameRGB);
    

    
  // Free the YUV frame
    
  av_free(pFrame);
    

    
  // Close the codec
    
  avcodec_close(pCodecCtx);
    

    
  // Close the video file
    
  av_close_input_file(pFormatCtx);
    

    
  return 0;
    
}

    after compiling the code i get this in log,

    07-04 10:58:38.961: D/dalvikvm(1010): Trying to load lib /data/data/ru.dzakhov.ffmpeg.test/lib/libmylib.so 0x4051e878
    
07-04 10:58:38.971: D/dalvikvm(1010): Added shared lib /data/data/ru.dzakhov.ffmpeg.test/lib/libmylib.so 0x4051e878
    
07-04 10:58:38.971: D/dalvikvm(1010): No JNI_OnLoad found in /data/data/ru.dzakhov.ffmpeg.test/lib/libmylib.so 0x4051e878, skipping init
    
07-04 10:58:39.011: I/System.out(1010): Creating Engine
    
07-04 10:58:39.011: I/mylib(1010): initiated
    
07-04 10:58:39.011: I/System.out(1010): Decoding Video
    
07-04 10:58:39.011: I/System.out(1010): passing video::/sdcard/NativeMedia.ts
    
07-04 10:58:39.101: W/dalvikvm(231): disableGcForExternalAlloc: false
    
07-04 10:58:39.121: I/DEBUG(71): *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** ***
    
07-04 10:58:39.121: I/DEBUG(71): Build fingerprint: 'htc_asia_india/htc_icong/icong:2.3.3/GRI40/68450.5:user/release-keys'
    
07-04 10:58:39.121: I/DEBUG(71): pid: 1010, tid: 1010  >>> ru.dzakhov.ffmpeg.test <<<
    
07-04 10:58:39.121: I/DEBUG(71): signal 4 (SIGILL), code 1 (ILL_ILLOPC), fault addr 8102de90
    
07-04 10:58:39.121: I/DEBUG(71):  r0 0000ac28  r1 40521b98  r2 40526340  r3 42157cc8
    
07-04 10:58:39.121: I/DEBUG(71):  r4 bee7d368  r5 00000004  r6 40521b98  r7 42157c88
    
07-04 10:58:39.121: I/DEBUG(71):  r8 bee7d348  r9 42157c80  10 42157c6c  fp 42f0f04c
    
07-04 10:58:39.121: I/DEBUG(71):  ip 8102de91  sp bee7d348  lr 80018378  pc 8102de90  cpsr a0000030
    
07-04 10:58:39.121: I/DEBUG(71):  d0  4140000041600000  d1  3ff0000041680000
    
07-04 10:58:39.121: I/DEBUG(71):  d2  bf80000000000000  d3  0000000000000000
    
07-04 10:58:39.121: I/DEBUG(71):  d4  0000000000000000  d5  3ff000003f800000
    
07-04 10:58:39.121: I/DEBUG(71):  d6  bff000003f800000  d7  4160000000000000
    
07-04 10:58:39.121: I/DEBUG(71):  d8  0000000000000000  d9  0000000000000000
    
07-04 10:58:39.121: I/DEBUG(71):  d10 0000000000000000  d11 0000000000000000
    
07-04 10:58:39.121: I/DEBUG(71):  d12 0000000000000000  d13 0000000000000000
    
07-04 10:58:39.121: I/DEBUG(71):  d14 0000000000000000  d15 0000000000000000
    
07-04 10:58:39.121: I/DEBUG(71):  scr 20000012
    
07-04 10:58:39.221: I/DEBUG(71):          #00  pc 0002de90  /data/data/ru.dzakhov.ffmpeg.test/lib/libmylib.so
    
07-04 10:58:39.221: I/DEBUG(71):          #01  pc 0004f13c  /system/lib/libdvm.so
    
07-04 10:58:39.221: I/DEBUG(71):          #02  pc 0001d584  /system/lib/libdvm.so
    
07-04 10:58:39.221: I/DEBUG(71):          #03  pc 00022b8c  /system/lib/libdvm.so
    
07-04 10:58:39.221: I/DEBUG(71):          #04  pc 00021a80  /system/lib/libdvm.so
    
07-04 10:58:39.221: I/DEBUG(71):          #05  pc 0006060a  /system/lib/libdvm.so
    
07-04 10:58:39.221: I/DEBUG(71):          #06  pc 0006828e  /system/lib/libdvm.so
    
07-04 10:58:39.221: I/DEBUG(71):          #07  pc 0001d584  /system/lib/libdvm.so
    
07-04 10:58:39.221: I/DEBUG(71):          #08  pc 00022b8c  /system/lib/libdvm.so
    
07-04 10:58:39.231: I/DEBUG(71):          #09  pc 00021a80  /system/lib/libdvm.so
    
07-04 10:58:39.231: I/DEBUG(71):          #10  pc 0006045c  /system/lib/libdvm.so
    
07-04 10:58:39.231: I/DEBUG(71):          #11  pc 0004c430  /system/lib/libdvm.so
    
07-04 10:58:39.231: I/DEBUG(71):          #12  pc 00037638  /system/lib/libandroid_runtime.so
    
07-04 10:58:39.231: I/DEBUG(71):          #13  pc 00038456  /system/lib/libandroid_runtime.so
    
07-04 10:58:39.231: I/DEBUG(71):          #14  pc 00008ca2  /system/bin/app_process
    
07-04 10:58:39.231: I/DEBUG(71):          #15  pc 00014f24  /system/lib/libc.so
    
07-04 10:58:39.231: I/DEBUG(71): code around pc:
    
07-04 10:58:39.231: I/DEBUG(71): 8102de70 003d9cd0 00000408 0029e598 0029e5de 
    
07-04 10:58:39.231: I/DEBUG(71): 8102de80 0029e5d8 0029e5d8 0029e5cc 0029e5c8 
    
07-04 10:58:39.231: I/DEBUG(71): 8102de90 4ff0e92d b0994604 f0004615 6823f945 
    
07-04 10:58:39.231: I/DEBUG(71): 8102dea0 46294620 32a4f8d3 47982200 46044f81 
    
07-04 10:58:39.231: I/DEBUG(71): 8102deb0 a8172300 22004621 9300447f f9c0f060 
    
07-04 10:58:39.231: I/DEBUG(71): code around lr:
    
07-04 10:58:39.231: I/DEBUG(71): 80018358 3497c004 3488c004 3afffff9 e2888004 
    
07-04 10:58:39.231: I/DEBUG(71): 80018368 eafffff9 e899000c e594c008 e12fff3c 
    
07-04 10:58:39.231: I/DEBUG(71): 80018378 e3550000 1594c00c 188c0003 e914a3f0 
    
07-04 10:58:39.231: I/DEBUG(71): 80018388 e1a05e22 e5946004 e3a02000 e4d6c001 
    
07-04 10:58:39.231: I/DEBUG(71): 80018398 e35c0000 0a000007 e2822001 e35c0044 
    
07-04 10:58:39.231: I/DEBUG(71): stack:
    
07-04 10:58:39.231: I/DEBUG(71):     bee7d308  000001b4  
    
07-04 10:58:39.231: I/DEBUG(71):     bee7d30c  c0000000  
    
07-04 10:58:39.231: I/DEBUG(71):     bee7d310  80018540  /system/lib/libdvm.so
    
07-04 10:58:39.231: I/DEBUG(71):     bee7d314  0000cf98  
    
07-04 10:58:39.231: I/DEBUG(71):     bee7d318  42157c6c  
    
07-04 10:58:39.231: I/DEBUG(71):     bee7d31c  afd139d9  /system/lib/libc.so
    
07-04 10:58:39.231: I/DEBUG(71):     bee7d320  0002de91  
    
07-04 10:58:39.241: I/DEBUG(71):     bee7d324  0000000e  
    
07-04 10:58:39.241: I/DEBUG(71):     bee7d328  80018540  /system/lib/libdvm.so
    
07-04 10:58:39.241: I/DEBUG(71):     bee7d32c  00000070  
    
07-04 10:58:39.241: I/DEBUG(71):     bee7d330  42157c6c  
    
07-04 10:58:39.241: I/DEBUG(71):     bee7d334  00238100  
    
07-04 10:58:39.241: I/DEBUG(71):     bee7d338  00000000  
    
07-04 10:58:39.241: I/DEBUG(71):     bee7d33c  00000000  
    
07-04 10:58:39.241: I/DEBUG(71):     bee7d340  df002777  
    
07-04 10:58:39.241: I/DEBUG(71):     bee7d344  e3a070ad  
    
07-04 10:58:39.241: I/DEBUG(71): #00 bee7d348  423692b4  
    
07-04 10:58:39.241: I/DEBUG(71):     bee7d34c  0000cf98  
    
07-04 10:58:39.241: I/DEBUG(71):     bee7d350  40521b98  
    
07-04 10:58:39.241: I/DEBUG(71):     bee7d354  8102de91  /data/data/ru.dzakhov.ffmpeg.test/lib/libmylib.so
    
07-04 10:58:39.241: I/DEBUG(71):     bee7d358  80018540  /system/lib/libdvm.so
    
07-04 10:58:39.241: I/DEBUG(71):     bee7d35c  0000cf98  
    
07-04 10:58:39.241: I/DEBUG(71):     bee7d360  bee7d368  
    
07-04 10:58:39.241: I/DEBUG(71):     bee7d364  800499df  /system/lib/libdvm.so
    
07-04 10:58:39.241: I/DEBUG(71):     bee7d368  42157c80  
    
07-04 10:58:39.241: I/DEBUG(71):     bee7d36c  42d58795  
    
07-04 10:58:39.241: I/DEBUG(71):     bee7d370  8102de91  /data/data/ru.dzakhov.ffmpeg.test/lib/libmylib.so
    
07-04 10:58:39.241: I/DEBUG(71):     bee7d374  bee7d418  
    
07-04 10:58:39.241: I/DEBUG(71):     bee7d378  00016de0  
    
07-04 10:58:39.241: I/DEBUG(71):     bee7d37c  0000ac28  
    
07-04 10:58:39.241: I/DEBUG(71):     bee7d380  00000001  
    
07-04 10:58:39.241: I/DEBUG(71):     bee7d384  bee7d418  
    
07-04 10:58:39.241: I/DEBUG(71):     bee7d388  42157c80  
    
07-04 10:58:39.241: I/DEBUG(71):     bee7d38c  40521b98  
    
07-04 10:58:39.241: I/DEBUG(71):     bee7d390  423692b4  
    
07-04 10:58:39.241: I/DEBUG(71):     bee7d394  800499a1  /system/lib/libdvm.so
    
07-04 10:58:39.241: I/DEBUG(71):     bee7d398  42157c80  
    
07-04 10:58:39.241: I/DEBUG(71):     bee7d39c  8004f13f  /system/lib/libdvm.so
    
07-04 10:58:39.241: I/DEBUG(71): #01 bee7d3a0  00000002  
    
07-04 10:58:39.251: I/DEBUG(71):     bee7d3a4  0000000e  
    
07-04 10:58:39.251: I/DEBUG(71):     bee7d3a8  bee7d418  
    
07-04 10:58:39.251: I/DEBUG(71):     bee7d3ac  0000cf98  
    
07-04 10:58:39.251: I/DEBUG(71):     bee7d3b0  400198b8  
    
07-04 10:58:39.251: I/DEBUG(71):     bee7d3b4  42d5861c  
    
07-04 10:58:39.251: I/DEBUG(71):     bee7d3b8  42157c98  
    
07-04 10:58:39.251: I/DEBUG(71):     bee7d3bc  bee7d410  
    
07-04 10:58:39.251: I/DEBUG(71):     bee7d3c0  40521b98  
    
07-04 10:58:39.251: I/DEBUG(71):     bee7d3c4  8001d588  /system/lib/libdvm.so

    Unable to understand what’s exact problem is there ?
    Here SaveFrame function is used it looks like,

    void SaveFrame(AVFrame *pFrame, int width, int height, int iFrame) {
    
  FILE *pFile;
    
  char szFilename[32];
    
  int  y;
    

    
  // Open file
    
  LOGI("Opening file!");
    
  sprintf(szFilename, "frame%d.ppm", iFrame);
    

    
  pFile=fopen(szFilename, "wb");
    
  if(pFile==NULL)
    
    return;
    

    
  // Write header
    
  fprintf(pFile, "P6\n%d %d\n255\n", width, height);
    
  //LOGI("width::"+width+"Height::"+height);
    
  // Write pixel data
    
  for(y=0; ydata[0]+y*pFrame->linesize[0], 1, width*3, pFile);
    
  }
    
  // Close file
    
  fclose(pFile);
    
}

    in log I didn’t get any Log which i placed in the code !

    Please help me out,

    Thanks

  • How To Write An Oscilloscope

    29 avril 2012, par Multimedia Mike — General, gme, oscilloscope, visualization

    I’m trying to figure out how to write a software oscilloscope audio visualization. It’s made more frustrating by the knowledge that I am certain that I have accomplished this task before.

    In this context, the oscilloscope is used to draw the time-domain samples of an audio wave form. I have written such a plugin as part of the xine project. However, for that project, I didn’t have to write the full playback pipeline— my plugin was just handed some PCM data and drew some graphical data in response. Now I’m trying to write the entire engine in a standalone program and I’m wondering how to get it just right.



    This is an SDL-based oscilloscope visualizer and audio player for Game Music Emu library. My approach is to have an audio buffer that holds a second of audio (44100 stereo 16-bit samples). The player updates the visualization at 30 frames per second. The o-scope is 512 pixels wide. So, at every 1/30th second interval, the player dips into the audio buffer at position ((frame_number % 30) * 44100 / 30) and takes the first 512 stereo frames for plotting on the graph.

    It seems to be working okay, I guess. The only problem is that the A/V sync seems to be slightly misaligned. I am just wondering if this is the correct approach. Perhaps the player should be performing some slightly more complicated calculation over those (44100/30) audio frames during each update in order to obtain a more accurate graph ? I described my process to an electrical engineer friend of mine and he insisted that I needed to apply something called hysteresis to the output or I would never get accurate A/V sync in this scenario.

    Further, I know that some schools of thought on these matters require that the dots in those graphs be connected, that the scattered points simply won’t do. I guess it’s a stylistic choice.

    Still, I think I have a reasonable, workable approach here. I might just be starting the visualization 1/30th of a second too late.

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