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• Wave bytes to buffer

  24 août 2016, par Mohammad Abu Musa

  I am encoding wav input from microphone which comes in four bytes format to ogg format. I think I have a problem shifting the bytes to the correct format here is the code I am using

  To explain more I get the audio frames from Google Chrome where I get data as const8 and channels, and samples. data field is always in 4 bytes format.

  I copy the data to a vector of type int16_t then I loop uninterleave samples which I think I am doing wrong. my question is how can I make sure the data is formatted correctly for ogg encoder to handle them correctly ?

  void EncoderInstance::OnGetBuffer(int32_t result, pp::AudioBuffer buffer) {
  
      if (result != PP_OK)
  
        return;
  
  
  
      assert(buffer.GetSampleSize() == PP_AUDIOBUFFER_SAMPLESIZE_16_BITS);
  
      const char* data = static_cast<const>(buffer.GetDataBuffer());
  
      uint32_t channels = buffer.GetNumberOfChannels();
  
      uint32_t samples = buffer.GetNumberOfSamples() / channels;
  
  
  
      if (channel_count_ != channels || sample_count_ != samples) {
  
        channel_count_ = channels;
  
        sample_count_ = samples;
  
  
  
        samples_.resize(sample_count_ * channel_count_);
  
        // Try (+ 5) to ensure that we pick up a new set of samples between each
  
        // timer-generated repaint.
  
        timer_interval_ = (sample_count_ * 1000) / buffer.GetSampleRate() + 5;
  
        // Start the timer for the first buffer.
  
        if (first_buffer_) {
  
          first_buffer_ = false;
  
          ScheduleNextTimer();
  
        }
  
      }
  
  
  
      if(is_audio_recording &amp;&amp; is_audio_header_written_)
  
      {
  
          memcpy(samples_.data(), data,
  
              sample_count_ * channel_count_ * sizeof(int16_t));
  
  
  
          float **buffer=vorbis_analysis_buffer(&amp;vd,samples);
  
  
  
          /* uninterleave samples */
  
          for(i=0;i4;i++)
  
          {
  
              buffer[0][i]=((samples_.at(i*4+1)&lt;&lt;8)|
  
                        (0x00ff&amp;(int16_t)samples_.at(i*4)))/32768.f;
  
              buffer[1][i]=((samples_.at(i*4+3)&lt;&lt;8)|
  
                        (0x00ff&amp;(int16_t)samples_.at(i*4+2)))/32768.f;
  
          }
  
  
  
          vorbis_analysis_wrote(&amp;vd,i);
  
  
  
          while(vorbis_analysis_blockout(&amp;vd,&amp;vb)==1){
  
  
  
            /* analysis, assume we want to use bitrate management */
  
            vorbis_analysis(&amp;vb,NULL);
  
            vorbis_bitrate_addblock(&amp;vb);
  
  
  
            while(vorbis_bitrate_flushpacket(&amp;vd,&amp;op)){
  
  
  
              /* weld the packet into the bitstream */
  
              ogg_stream_packetin(&amp;os,&amp;op);
  
  
  
              /* write out pages (if any) */
  
              while(!eos){
  
                int result=ogg_stream_pageout(&amp;os,&amp;og);
  
                if(result==0)break;
  
                glb_app_thread.message_loop().PostWork(callback_factory_.NewCallback(&amp;EncoderInstance::writeAudioHeader));
  
                if(ogg_page_eos(&amp;og))eos=1;
  
              }
  
            }
  
          }
  
  
  
  
  
      }
  
  
  
  
  
  
  
  
  
      audio_track_.RecycleBuffer(buffer);
  
      audio_track_.GetBuffer(callback_factory_.NewCallbackWithOutput(
  
          &amp;EncoderInstance::OnGetBuffer));
  
  
  
  }
  
  </const>

• Compling ffmpeg with libwebp error(s)

  30 avril 2018, par Madao

  So I’m trying to compile ffmpeg with —enable-libwebp. But I am getting the following errors :

  In file included from libavcodec/libwebpenc_animencoder.c:30:0:
  
  /usr/include/webp/mux.h:101:13: error: expected identifier or ‘(’ before ‘int’
  
   WEBP_EXTERN(int) WebPGetMuxVersion(void);
  
               ^~~
  
  /usr/include/webp/mux.h:107:13: error: expected identifier or ‘(’ before ‘WebPMux’
  
   WEBP_EXTERN(WebPMux*) WebPNewInternal(int);
  
               ^~~~~~~
  
  /usr/include/webp/mux.h:120:13: error: expected identifier or ‘(’ before ‘void’
  
   WEBP_EXTERN(void) WebPMuxDelete(WebPMux* mux);
  
               ^~~~
  
  /usr/include/webp/mux.h:126:13: error: expected identifier or ‘(’ before ‘WebPMux’
  
   WEBP_EXTERN(WebPMux*) WebPMuxCreateInternal(const WebPData*, int, int);
  
               ^~~~~~~
  
  /usr/include/webp/mux.h:163:13: error: expected identifier or ‘(’ before ‘WebPMuxError’
  
   WEBP_EXTERN(WebPMuxError) WebPMuxSetChunk(
  
               ^~~~~~~~~~~~
  
  /usr/include/webp/mux.h:179:13: error: expected identifier or ‘(’ before ‘WebPMuxError’
  
   WEBP_EXTERN(WebPMuxError) WebPMuxGetChunk(
  
               ^~~~~~~~~~~~
  
  /usr/include/webp/mux.h:192:13: error: expected identifier or ‘(’ before ‘WebPMuxError’
  
   WEBP_EXTERN(WebPMuxError) WebPMuxDeleteChunk(
  
               ^~~~~~~~~~~~
  
  /usr/include/webp/mux.h:225:13: error: expected identifier or ‘(’ before ‘WebPMuxError’
  
   WEBP_EXTERN(WebPMuxError) WebPMuxSetImage(
  
               ^~~~~~~~~~~~
  
  /usr/include/webp/mux.h:245:13: error: expected identifier or ‘(’ before ‘WebPMuxError’
  
   WEBP_EXTERN(WebPMuxError) WebPMuxPushFrame(
  
               ^~~~~~~~~~~~
  
  /usr/include/webp/mux.h:263:13: error: expected identifier or ‘(’ before ‘WebPMuxError’
  
   WEBP_EXTERN(WebPMuxError) WebPMuxGetFrame(
  
               ^~~~~~~~~~~~
  
  ...

  Is there a certain version of libwebp I need to be using ? Any help would be greatly appreciated.

• Piwik Mobile 2.1.1 with full support for iOS 8 and iPhone 6 Plus

  2 octobre 2014, par Thomas Steur — Piwik Mobile Releases

  Piwik Mobile 2.1.1 is now available and comes with full support for iOS 8 and iPhone 6 Plus.

  Please email us if you still experience any issues with this release.

  Thank you !