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• How to find the memory leak in ios xcode ?

  12 août 2014, par Ajin Chacko

  It’s my RTSP streaming ios application with FFMPEG decoder and it streaming fine, But the memory continuously increasing while running. Please help me, Is it a memory leak ?. And how can I track the leak ?.

  Its my video streaming class : RTSPPlayer.m

  #import "RTSPPlayer.h"
  
  #import "Utilities.h"
  
  #import "AudioStreamer.h"
  
  
  
  @interface RTSPPlayer ()
  
  @property (nonatomic, retain) AudioStreamer *audioController;
  
  @end
  
  
  
  @interface RTSPPlayer (private)
  
  -(void)convertFrameToRGB;
  
  -(UIImage *)imageFromAVPicture:(AVPicture)pict width:(int)width height:(int)height;
  
  -(void)setupScaler;
  
  @end
  
  
  
  @implementation RTSPPlayer
  
  
  
  @synthesize audioController = _audioController;
  
  @synthesize audioPacketQueue,audioPacketQueueSize;
  
  @synthesize _audioStream,_audioCodecContext;
  
  @synthesize emptyAudioBuffer;
  
  
  
  @synthesize outputWidth, outputHeight;
  
  
  
  - (void)setOutputWidth:(int)newValue
  
  {
  
      if (outputWidth != newValue) {
  
          outputWidth = newValue;
  
          [self setupScaler];
  
      }
  
  }
  
  
  
  - (void)setOutputHeight:(int)newValue
  
  {
  
      if (outputHeight != newValue) {
  
          outputHeight = newValue;
  
          [self setupScaler];
  
      }
  
  }
  
  
  
  - (UIImage *)currentImage
  
  {
  
      if (!pFrame->data[0]) return nil;
  
      [self convertFrameToRGB];
  
      return [self imageFromAVPicture:picture width:outputWidth height:outputHeight];
  
  }
  
  
  
  - (double)duration
  
  {
  
      return (double)pFormatCtx->duration / AV_TIME_BASE;
  
  }
  
  
  
  - (double)currentTime
  
  {
  
      AVRational timeBase = pFormatCtx->streams[videoStream]->time_base;
  
      return packet.pts * (double)timeBase.num / timeBase.den;
  
  }
  
  
  
  - (int)sourceWidth
  
  {
  
      return pCodecCtx->width;
  
  }
  
  
  
  - (int)sourceHeight
  
  {
  
      return pCodecCtx->height;
  
  }
  
  
  
  - (id)initWithVideo:(NSString *)moviePath usesTcp:(BOOL)usesTcp
  
  {
  
      if (!(self=[super init])) return nil;
  
  
  
      AVCodec         *pCodec;
  
  
  
      // Register all formats and codecs
  
      avcodec_register_all();
  
      av_register_all();
  
      avformat_network_init();
  
  
  
      // Set the RTSP Options
  
      AVDictionary *opts = 0;
  
      if (usesTcp) 
  
          av_dict_set(&opts, "rtsp_transport", "tcp", 0);
  
  
  
  
  
      if (avformat_open_input(&pFormatCtx, [moviePath UTF8String], NULL, &opts) !=0 ) {
  
          av_log(NULL, AV_LOG_ERROR, "Couldn't open file\n");
  
          goto initError;
  
      }
  
  
  
      // Retrieve stream information
  
      if (avformat_find_stream_info(pFormatCtx,NULL) < 0) {
  
          av_log(NULL, AV_LOG_ERROR, "Couldn't find stream information\n");
  
          goto initError;
  
      }
  
  
  
      // Find the first video stream
  
      videoStream=-1;
  
      audioStream=-1;
  
  
  
      for (int i=0; inb_streams; i++) {
  
          if (pFormatCtx->streams[i]->codec->codec_type==AVMEDIA_TYPE_VIDEO) {
  
              NSLog(@"found video stream");
  
              videoStream=i;
  
          }
  
  
  
          if (pFormatCtx->streams[i]->codec->codec_type==AVMEDIA_TYPE_AUDIO) {
  
              audioStream=i;
  
              NSLog(@"found audio stream");
  
          }
  
      }
  
  
  
      if (videoStream==-1 && audioStream==-1) {
  
          goto initError;
  
      }
  
  
  
      // 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) {
  
          av_log(NULL, AV_LOG_ERROR, "Unsupported codec!\n");
  
          goto initError;
  
      }
  
  
  
      // Open codec
  
      if (avcodec_open2(pCodecCtx, pCodec, NULL) < 0) {
  
          av_log(NULL, AV_LOG_ERROR, "Cannot open video decoder\n");
  
          goto initError;
  
      }
  
  
  
      if (audioStream > -1 ) {
  
          NSLog(@"set up audiodecoder");
  
          [self setupAudioDecoder];
  
      }
  
  
  
      // Allocate video frame
  
      pFrame = avcodec_alloc_frame();
  
  
  
      outputWidth = pCodecCtx->width;
  
      self.outputHeight = pCodecCtx->height;
  
  
  
      return self;
  
  
  
  initError:
  
  //  [self release];
  
      return nil;
  
  }
  
  
  
  
  
  - (void)setupScaler
  
  {
  
      // Release old picture and scaler
  
      avpicture_free(&picture);
  
      sws_freeContext(img_convert_ctx);   
  
  
  
      // Allocate RGB picture
  
      avpicture_alloc(&picture, PIX_FMT_RGB24, outputWidth, outputHeight);
  
  
  
      // Setup scaler
  
      static int sws_flags =  SWS_FAST_BILINEAR;
  
      img_convert_ctx = sws_getContext(pCodecCtx->width, 
  
                                       pCodecCtx->height,
  
                                       pCodecCtx->pix_fmt,
  
                                       outputWidth, 
  
                                       outputHeight,
  
                                       PIX_FMT_RGB24,
  
                                       sws_flags, NULL, NULL, NULL);
  
  
  
  }
  
  
  
  - (void)seekTime:(double)seconds
  
  {
  
      AVRational timeBase = pFormatCtx->streams[videoStream]->time_base;
  
      int64_t targetFrame = (int64_t)((double)timeBase.den / timeBase.num * seconds);
  
      avformat_seek_file(pFormatCtx, videoStream, targetFrame, targetFrame, targetFrame, AVSEEK_FLAG_FRAME);
  
      avcodec_flush_buffers(pCodecCtx);
  
  }
  
  
  
  - (void)dealloc
  
  {
  
      // Free scaler
  
      sws_freeContext(img_convert_ctx);   
  
  
  
      // Free RGB picture
  
      avpicture_free(&picture);
  
  
  
      // Free the packet that was allocated by av_read_frame
  
      av_free_packet(&packet);
  
  
  
      // Free the YUV frame
  
      av_free(pFrame);
  
  
  
      // Close the codec
  
      if (pCodecCtx) avcodec_close(pCodecCtx);
  
  
  
      // Close the video file
  
      if (pFormatCtx) avformat_close_input(&pFormatCtx);
  
  
  
      [_audioController _stopAudio];
  
     // [_audioController release];
  
      _audioController = nil;
  
  
  
    //  [audioPacketQueue release];
  
      audioPacketQueue = nil;
  
  
  
   //   [audioPacketQueueLock release];
  
      audioPacketQueueLock = nil;
  
  
  
  //  [super dealloc];
  
  }
  
  
  
  - (BOOL)stepFrame
  
  {
  
      // AVPacket packet;
  
      int frameFinished=0;
  
  
  
      while (!frameFinished && 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);
  
          }
  
  
  
          if (packet.stream_index==audioStream) {
  
              // NSLog(@"audio stream");
  
              [audioPacketQueueLock lock];
  
  
  
              audioPacketQueueSize += packet.size;
  
              [audioPacketQueue addObject:[NSMutableData dataWithBytes:&packet length:sizeof(packet)]];
  
  
  
              [audioPacketQueueLock unlock];
  
  
  
              if (!primed) {
  
                  primed=YES;
  
                  [_audioController _startAudio];
  
              }
  
  
  
              if (emptyAudioBuffer) {
  
                  [_audioController enqueueBuffer:emptyAudioBuffer];
  
              }
  
          }
  
      }
  
  
  
      return frameFinished!=0;
  
  }
  
  
  
  - (void)convertFrameToRGB
  
  {
  
      sws_scale(img_convert_ctx,
  
                pFrame->data,
  
                pFrame->linesize,
  
                0,
  
                pCodecCtx->height,
  
                picture.data,
  
                picture.linesize);
  
  }
  
  
  
  - (UIImage *)imageFromAVPicture:(AVPicture)pict width:(int)width height:(int)height
  
  {
  
      CGBitmapInfo bitmapInfo = kCGBitmapByteOrderDefault;
  
      CFDataRef data = CFDataCreateWithBytesNoCopy(kCFAllocatorDefault, pict.data[0], pict.linesize[0]*height,kCFAllocatorNull);
  
      CGDataProviderRef provider = CGDataProviderCreateWithCFData(data);
  
      CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();
  
      CGImageRef cgImage = CGImageCreate(width, 
  
                                         height, 
  
                                         8, 
  
                                         24, 
  
                                         pict.linesize[0], 
  
                                         colorSpace, 
  
                                         bitmapInfo, 
  
                                         provider, 
  
                                         NULL, 
  
                                         NO, 
  
                                         kCGRenderingIntentDefault);
  
      CGColorSpaceRelease(colorSpace);
  
      UIImage *image = [UIImage imageWithCGImage:cgImage];
  
  
  
      CGImageRelease(cgImage);
  
      CGDataProviderRelease(provider);
  
      CFRelease(data);
  
  
  
      return image;
  
  }
  
  
  
  - (void)setupAudioDecoder
  
  {    
  
      if (audioStream >= 0) {
  
          _audioBufferSize = AVCODEC_MAX_AUDIO_FRAME_SIZE;
  
          _audioBuffer = av_malloc(_audioBufferSize);
  
          _inBuffer = NO;
  
  
  
          _audioCodecContext = pFormatCtx->streams[audioStream]->codec;
  
          _audioStream = pFormatCtx->streams[audioStream];
  
  
  
          AVCodec *codec = avcodec_find_decoder(_audioCodecContext->codec_id);
  
          if (codec == NULL) {
  
              NSLog(@"Not found audio codec.");
  
              return;
  
          }
  
  
  
          if (avcodec_open2(_audioCodecContext, codec, NULL) < 0) {
  
              NSLog(@"Could not open audio codec.");
  
              return;
  
          }
  
  
  
          if (audioPacketQueue) {
  
            //  [audioPacketQueue release];
  
              audioPacketQueue = nil;
  
          }        
  
          audioPacketQueue = [[NSMutableArray alloc] init];
  
  
  
          if (audioPacketQueueLock) {
  
          //    [audioPacketQueueLock release];
  
              audioPacketQueueLock = nil;
  
          }
  
          audioPacketQueueLock = [[NSLock alloc] init];
  
  
  
          if (_audioController) {
  
              [_audioController _stopAudio];
  
           //   [_audioController release];
  
              _audioController = nil;
  
          }
  
          _audioController = [[AudioStreamer alloc] initWithStreamer:self];
  
      } else {
  
          pFormatCtx->streams[audioStream]->discard = AVDISCARD_ALL;
  
          audioStream = -1;
  
      }
  
  }
  
  
  
  - (void)nextPacket
  
  {
  
      _inBuffer = NO;
  
  }
  
  
  
  - (AVPacket*)readPacket
  
  {
  
      if (_currentPacket.size > 0 || _inBuffer) return &_currentPacket;
  
  
  
      NSMutableData *packetData = [audioPacketQueue objectAtIndex:0];
  
      _packet = [packetData mutableBytes];
  
  
  
      if (_packet) {
  
          if (_packet->dts != AV_NOPTS_VALUE) {
  
              _packet->dts += av_rescale_q(0, AV_TIME_BASE_Q, _audioStream->time_base);
  
          }
  
  
  
          if (_packet->pts != AV_NOPTS_VALUE) {
  
              _packet->pts += av_rescale_q(0, AV_TIME_BASE_Q, _audioStream->time_base);
  
          }
  
  
  
          [audioPacketQueueLock lock];
  
          audioPacketQueueSize -= _packet->size;
  
          if ([audioPacketQueue count] > 0) {
  
              [audioPacketQueue removeObjectAtIndex:0];
  
          }
  
          [audioPacketQueueLock unlock];
  
  
  
          _currentPacket = *(_packet);
  
      }
  
  
  
      return &_currentPacket;   
  
  }
  
  
  
  - (void)closeAudio
  
  {
  
      [_audioController _stopAudio];
  
      primed=NO;
  
  }
  
  
  
  @end

• Révision 21476 : complement a r21475 : ce n’est pas la meme autorisation pour modifier le login e...

  2 août 2014, par cedric -

  + si on a pas le droit d’editer l’auteur, le formulaire ne doit pas etre editable

• How to find and decode efficiently Nth frame with libavcodec ?

  7 décembre 2016, par theateist

  Please, this is not duplicate of similar posts !

  I want to find and to decode Nth frame, for example 7th frame.

  As I understood, using time_base I can calculate how many ticks is each frame and by multiplying it with 7 we will get position of 7th frame. To calculate the ticks I do

  AVStream inStream = getStreamFromAVFormatContext();
  
  
  
  int fps = inStream->r_frame_rate.num;
  
  AVRational timeBase = inStream->time_base;
  
  
  
  int ticks_per_frame = (1/fps) / timeBase;
  
  int _7thFramePos = ticks_per_frame * 7;

  1. Did I calculated correctly position of 7th frame ? If I did, so to go to that frame I just do av_seek_frame(pFormatCtx, -1, _7thFramePos, AVSEEK_FLAG_ANY), right ?
     What happens if the 7th frame was P-Frame or B-Frame, how I decode it ?
  2. I noticed that the calculated value differs from inStream->codec->ticks_per_frame, why ? Shouldn’t they be the same ? What is the difference ?