hello All,
I am trying to decode H.264 incoming stream from LIVE555 but not able to
get the value of m_nGotPicture as non-zero.
my code is as below , the same code is working just fine in case of MJPEG
codec.
please let me know If I need to perform anything else to successfuly decode
the incoming H.264 stream.
Initialization of codec :
if (true == bResult)
{
m_nCodecID = codecID;
/*avcodec api. Finds a decoder with a matching codec ID*/
m_pCodec = avcodec_find_decoder(CODEC_ID_H264);
if(NULL == m_pCodec)
{
bResult = false;
}
}
if (true == bResult)//allocates struct
{
/*avcodec api. * Allocates an AVCodecContext
* and sets its fields to default values*/
m_pContext = avcodec_alloc_context();
if(NULL == m_pContext)
{
bResult = false;
}
}
if (true == bResult)//allocates frame
{
/*Allocates an AVFrame and sets its fields to default values*/
m_pPicture = avcodec_alloc_frame();
m_pPictureRGB = avcodec_alloc_frame();
if(NULL == m_pPicture || NULL == m_pPictureRGB)
{
bResult = false;
}
}
if (true == bResult)//Open codec finally
{
m_pContext->width = m_nWidth;
m_pContext->height = m_nHeight;
m_pContext->flags |= CODEC_FLAG_4MV;
m_pContext->flags |= CODEC_FLAG_PART;
m_pContext->pix_fmt = PIX_FMT_RGB24;
m_pContext->workaround_bugs = 0;
if(avcodec_open(m_pContext, m_pCodec) < 0)
{
bResult = false;
}
}
Decoding Part:
bool NVCCORE_Decoder::DecodeFrame(char *pbuf, int bufsize)
{
bool bResult = false;
int len = 0;
if(pbuf != NULL && 0 != bufsize)
{
bResult = true;
}
if (true == bResult)//verify the frame and m_nGot_picture
{
/* decodes a video frame from the input buffer*/
if((len = avcodec_decode_video(m_pContext, m_pPicture,
&m_nGot_picture, (uint8_t*)pbuf, bufsize)) < 0)
{
bResult = FALSE;
}
}
if (true == bResult)
{
if(m_nGot_picture)
{
/*The fields of the given AVPicture are filled in
depending on the specified picture format */
avpicture_fill((AVPicture*)m_pPictureRGB,
RGBbuf,
PIX_FMT_RGB24,
m_pContext->width,
m_pContext->height);
/*Conversion of pixel format*/
img_convert((AVPicture *)m_pPictureRGB, PIX_FMT_BGR24,
(AVPicture*)m_pPicture, m_pContext->pix_fmt,
m_pContext->width, m_pContext->height);
/*send decoded data to UI*/
((fxn_callbackmedia.pfnMediaTransmission))
(m_nWidth,m_nHeight,m_pPictureRGB->data[0]);
}
}
m_nGot_picture = 0;
return bResult;
}
Regards
Deepti
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