Can only get black frames from the h.264 decoder.

lycono — Tue, 20 May 2008 21:47:03 GMT

Hello all,

I'm trying to integrate the ipp h.264 decoder into our application. I get frame data from an RTP stream. All I can get out of the decoder are black frames (all 0's) where I expect an RGB32 formatted array of bytes. In the debugger the return value from "GetFrame" is UMC_OK, so I assume the decoder was able to decode a frame.

We also use libavcodec (ffmpeg) which seems to work fine, so we're pretty sure it's not bad input data. I've recorded a chunk of video data to a file and played it with the simple_player application. It appears to decode just fine based on the statistics output.

Choice bits of the code are below. Any help is appreciated.

bool ScIppH264Decoder::initialize(int width, int height)
{
  //-- Create video input buffer.
  m_in_buf = new UMC::MediaData();

  //-- Create output buffer.
  m_out_buf = new UMC::VideoData();
  m_out_buf->Init(width, height, UMC::RGB32);
  m_out_buf->InitAlloc(width, height, UMC::RGB32);
  m_out_buf->SetColorFormat(UMC::RGB32);
  m_out_buf->SetFrameType(UMC::P_PICTURE);

  //-- Create decoder.
  m_decoder = new UMC::H264VideoDecoder();
  if (m_decoder == NULL)
  {
    return false;
  }

  UMC::ColorConversionInfo *colorParams = new UMC::ColorConversionInfo();
  colorParams->FormatDest = UMC::RGB32;
  colorParams->SizeSource.width = width;
  colorParams->SizeSource.height = height;
  colorParams->SizeDest.width = width;
  colorParams->SizeDest.height = height;
  colorParams->lFlags = UMC::FLAG_CCNV_NONE;
  colorParams->lDeinterlace = 0;
  colorParams->lInterpolation = IPPI_INTER_NN;

  UMC::VideoDecoderParams *params = new UMC::VideoDecoderParams();
  params->m_pData = m_in_buf;
  params->cformat = UMC::RGB32;
  params->lFlags = UMC::FLAG_VDEC_NO_PREVIEW | UMC::FLAG_VDEC_COMPATIBLE | UMC::FLAG_VDEC_REORDER;
  params->lpConverter = new TimedColorConverter();
  params->lpConvertInit = colorParams;
  params->uiLimitThreads = 1;

  if (m_decoder->Init(params) != UMC::UMC_OK)
  {
    return false;
  }
  
  return true;
}

int ScIppH264Decoder::getImage(unsigned char **ptrDecodeImage)
{
  *ptrDecodeImage = (unsigned char*) m_out_buf->GetDataPointer();
  return m_out_buf->GetDataSize();
}

int ScIppH264Decoder::decode(int width, int height, unsigned char *buf, int bufSize, bool *gotImage)
{
  if (!m_initialized)
  {
    if (!(m_initialized = initialize(width, height)))
    {
      *gotImage = false;
      return -1;
    }
  }

  if ((bufSize == 0) || (buf == NULL))
  {
    *gotImage = false;
    return -1;
  }

  m_in_buf->SetBufferPointer(buf, bufSize);
  m_in_buf->SetDataSize(bufSize);
  UMC::Status decStatus = UMC::UMC_OK;

  do
  {
    decStatus = m_decoder->GetFrame(m_in_buf, m_out_buf);
  }
  while ((decStatus != UMC::UMC_NOT_ENOUGH_DATA) &&
    (decStatus != UMC::UMC_OK));

  if (decStatus == UMC::UMC_NOT_ENOUGH_DATA)
  {
    *gotImage = false;
    return bufSize;
  }
  else if (decStatus == UMC::UMC_OK)
  {
    *gotImage = true;
    return bufSize;
  }
  else
  {
    *gotImage = false;
    return -1;
  
}
}

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Can only get black frames from the h.264 decoder.