<html> <head> <style></style> </head> <body class='hmmessage'> Hi Micheal, i am following your advice in order to allocate the output buffer. But i have a problem, I insert my encryption plug-in in a pipeline and when i try to run the pipeline i obtain a file with only audio track; video track is disappeared. My pipeline is this:                                                                             -->queue--->decoder--->audioconverter-->encoder--->identity--->queue--- AUDIO Filesrc-->avidemux----                                                                                                                                ---> mux-->filesink                                       -->queue--->DES TOOL--->queue------------------------------------------------------- VIDEO I have annex in this mail my gst_destool_chain() function in which i have inserted the buffer output allocation and the encryption plug-in: Can you say to me if is correct? Thanks in advance!!!!! /* chain function  * this function does the actual processing  */ static GstFlowReturn gst_destool_chain (GstPad * pad, GstBuffer * inbuf) {   GstDesTool *filter;   GstBuffer *outbuf;   outbuf=NULL;   filter = GST_DESTOOL (GST_OBJECT_PARENT (pad));   if (filter->silent == FALSE)   {     //printf ("I'm plugged, therefore I'm in.\n");     //filter->process (filter, GST_BUFFER_DATA (buf), GST_BUFFER_SIZE (buf));     //Calculating the dimensione of the output buffer         guint padSize = (8 - inbuf->size % 8);         guint newSize = inbuf->size + padSize;         guint pad;             //Allocate output buffer     outbuf= gst_buffer_new_and_alloc (newSize);     GST_BUFFER_TIMESTAMP(outbuf)= GST_BUFFER_TIMESTAMP (inbuf);     GST_BUFFER_DURATION(outbuf)= GST_BUFFER_DURATION (inbuf);     gst_buffer_set_caps (outbuf, GST_PAD_CAPS (filter->srcpad));             guint8 startCode[3] = { 0x00, 0x00, 0x01 };     if ( (guint8*)memmem( inbuf->data, inbuf->size, startCode, 3 ) == inbuf->data )          {             memcpy( outbuf->data, inbuf->data, inbuf->size );                // Doing padding           for(  pad = 0; pad < padSize; ++pad )          {             outbuf->data[ inbuf->size + pad ] = padSize;          }         // prepare des key         DES_key_schedule schedule;         DES_set_key ( (des_cblock*)filter->key, &schedule );         //do encryption         DES_ncbc_encrypt( inbuf->data + 4, outbuf->data + 4, newSize - 4, &schedule, (des_cblock*)filter->iv, DES_ENCRYPT );     }     else     {         fprintf( stderr, "begin of frame is not expected start code, dropping\n");     }         }     /* just push out the incoming buffer without touching it */   gst_buffer_unref (inbuf);   return gst_pad_push (filter->srcpad, outbuf); } > Date: Sat, 30 Jan 2010 15:54:28 -0800 > From: msmith@xiph.org > To: gstreamer-devel@lists.sourceforge.net > Subject: Re: [gst-devel] gstreamer gstbasetransform > > On Sat, Jan 30, 2010 at 2:43 AM, Federico Paganini > <black_eagle85@hotmail.com> wrote: > > Hi, > > > > I briefly explain to you my problem. For my thesis i am developing a > > gstreamer plug-in that encrypt an mpeg4 video with DES in CBC mode. The > > encryption is made frame by frame and because a frame doesn't contain an > > exact number of DES BLOCK SIZE(64 bit) i must padding the final bytes of the > > frame. Because i use padding the dimension of the frame in output is greater > > than that in input. For this reason i must allocate an output buffer of a > > precise size. So in the trasform function of my plug in i have tried to call > > this function: gst_base_transform_prepare_output_buffer( base, inbuf, > > newSize, inbuf->caps,&outbuf ); but when i try to compile i have this > > error:error: implicit declaration of function > > ‘gst_base_transform_prepare_output_buffer’ nevertheless i have done the > > include of gstbasetransform.h. > > I would be very happy if you can say to me how i must to  allocate an output > > buffer that is larger than input. > > For what you're doing, you probably don't want to make your element a > subclass of GstBaseTransform at all - instead you should directly > subclass GstElement. You can use gst_pad_alloc_buffer() or > gst_buffer_new_and_alloc() to allocate your output buffer with any > size you want. > > Mike > > ------------------------------------------------------------------------------ > The Planet: dedicated and managed hosting, cloud storage, colocation > Stay online with enterprise data centers and the best network in the business > Choose flexible plans and management services without long-term contracts > Personal 24x7 support from experience hosting pros just a phone call away. > http://p.sf.net/sfu/theplanet-com > _______________________________________________ > gstreamer-devel mailing list > gstreamer-devel@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/gstreamer-devel <hr />Non sei a casa? <a href='http://www.messenger.it/web/default.aspx' target='_new'>Accedi a Messenger dal Web!</a></body> </html>