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• Iphone Streaming and playing Audio Problem

  20 août 2011, par KayKay

  I am trying to make an app that plays audio stream using ffmpeg, libmms.
  I can open mms server, get stream, and decode audio frame to raw frame using suitable codec.
  However I don't know how to do next.
  I think I must use AudioToolbox/AudioToolbox.h and make audioqueue.
  but however when I give audioqueuebuffer decode buffer's memory and play, Only plays the white noise.
  Here is my code.

  What am i missing ?
  Any comment and hint is very appreciated.
  Thanks very much.

  while(av_read_frame(pFormatCtx, &pkt)>=0)
  
  {
  
      int pkt_decoded_len = 0;
  
      int frame_decoded_len;
  
      int decode_buff_remain=AVCODEC_MAX_AUDIO_FRAME_SIZE * 5;
  
      if(pkt.stream_index==audiostream)
  
      {
  
          frame_decoded_len=decode_buff_remain;
  
          int16_t *decode_buff_ptr = decode_buffer;
  
          int decoded_tot_len=0;
  
          pkt_decoded_len = avcodec_decode_audio2(pCodecCtx, decode_buff_ptr, &frame_decoded_len,
  
                                                  pkt.data, pkt.size);
  
          if (pkt_decoded_len <0) break;
  
          AudioQueueAllocateBuffer(audioQueue, kBufferSize, &buffers[i]);
  
          AQOutputCallback(self, audioQueue, buffers[i], pkt_decoded_len);
  
  
  
          if(i == 1){
  
              AudioQueueSetParameter(audioQueue, kAudioQueueParam_Volume, 1.0);
  
              AudioQueueStart(audioQueue, NULL);
  
          }
  
          i++;
  
      }
  
  }
  
  
  
  
  
  void AQOutputCallback(void *inData, AudioQueueRef inAQ, AudioQueueBufferRef inBuffer, int copySize)
  
  {
  
      mmsDemoViewController *staticApp = (mmsDemoViewController *)inData;
  
      [staticApp handleBufferCompleteForQueue:inAQ buffer:inBuffer size:copySize];
  
  }
  
  
  
  - (void)handleBufferCompleteForQueue:(AudioQueueRef)inAQ
  
                            buffer:(AudioQueueBufferRef)inBuffer
  
                              size:(int)copySize
  
  {
  
      inBuffer->mAudioDataByteSize = inBuffer->mAudioDataBytesCapacity;
  
      memcpy((char*)inBuffer->mAudioData, (const char*)decode_buffer, copySize);
  
  
  
      AudioQueueEnqueueBuffer(inAQ, inBuffer, 0, NULL);
  
  }

• Revert "swscale : disable ARM code until its build failure with clang/iphone is fixed"

  12 janvier 2014, par Michael Niedermayer

  Revert "swscale : disable ARM code until its build failure with clang/iphone is fixed"
  This reverts commit c8c7736c1025bcf5bb27e104a0d0eae749408739.
  

  • [DH] libswscale/arm/Makefile
  • [DH] libswscale/swscale_unscaled.c

• passing additional values to s3 event notification for lambda consumption

  8 septembre 2017, par user1790300

  I have to write code in react-native that allows a user to upload videos to amazon s3 to be transcoded for consumption by various devices. For the processing after the upload occurs ; I am reviewing two approaches :

  1) I can use Lambda with ffmpeg to handle the transcoding immediately after the uploading occurs (my fear here would be the amount of time required to transcode the videos and the effect on pricing if it takes a considerable amount of time).

  2) I can have s3 pass an sns message to a rest api after the created event occurs and the rest api generate a rabbitmq message that will be processed by worker that will perform the transcoding using ffmpeg.

  Option 1) seems to be the preferable option based on a completion time perspective. How concerned should I be with using 1) considering how long video transcoding might take as opposed to option 2) ?

  Also, regardless, I need a way to pass additional parameters to lambda or along the sns messaging that would allow me to somehow associate the user who uploaded the video with their account. Is there a way to pass additional text-based values to s3 to pass along to lambda or along sns when the upload completes, as a caveat I plan to upload the video directly to s3 using the rest layer(found this answer here : http://docs.aws.amazon.com/AmazonS3/latest/API/RESTObjectPUT.html#RESTObjectPUT-responses-examples) ?