[gst-embedded] Need Help On gst-omapfb built from openembedded

[Tejas]

Hello All,

               Is it possible to pass decoder output buffer directly to
color conversion routine. The snap shot of render function is as followed.

 

static GstFlowReturn

render (GstBaseSink * bsink, GstBuffer * buf)

{

    int i, w, h;

    GstOmapFbSink *omapfbsink = GST_OMAPFB_SINK(bsink);

    __uint8_t *fb = omapfbsink->framebuffer, *data = GST_BUFFER_DATA(buf);

       long iTime=0;

   struct timeval tempo1, tempo2;

 

    if(omapfbsink->plane_info.enabled == 2)

    {

        omapfbsink->plane_info.enabled = 1;

 

        g_mutex_lock (omapfbsink->x_lock);

        gst_omapfbsink_update_plane(omapfbsink);

        g_mutex_unlock (omapfbsink->x_lock);

    }

 

    g_print("\n Address in render function = %x\n", (unsigned
int)GST_BUFFER_DATA(buf));

    /* If a buffer which wasn't supplied by us is given to us to render
with,

       we need to copy to our buffer first so that memory alignment
constraints

       are met. */

 

    if(data != omapfbsink->buffer && GST_BUFFER_SIZE(buf) <=
omapfbsink->buffer_size)

    {

        memcpy(omapfbsink->buffer, data, GST_BUFFER_SIZE(buf));

        data = omapfbsink->buffer;

    }

 

    /* buffer_alloc gave a direct buffer, so we have nothing to

       do here... */

    if(omapfbsink->row_skip)

        return GST_FLOW_OK;

 

    switch(omapfbsink->image_format) {

        case GST_MAKE_FOURCC('I', '4', '2', '0'):

            /* Convert to YUV422 and send to FB */

 

            h = GST_VIDEO_SINK_HEIGHT (omapfbsink);

            w = GST_VIDEO_SINK_WIDTH (omapfbsink);

 

            __uint8_t *y, *u, *v;

            y = data;

            u = y + w * h;

            v = u + w / 2 * h / 2;

 

            yuv420_to_yuv422(fb, y, u, v, w & ~15, h, w, w / 2,
omapfbsink->fixinfo.line_length);

            break;

 

        case GST_MAKE_FOURCC('U', 'Y', 'V', 'Y'):

            /* Send to FB, taking into account line_length */

 

            w = 2 * GST_VIDEO_SINK_WIDTH (omapfbsink);

            for(i = 0; i < GST_VIDEO_SINK_HEIGHT (omapfbsink); i++)

            {

                memcpy(fb, data, w);

 

                fb += omapfbsink->fixinfo.line_length;

                data += w;

            }

 

            break;

    }

 

    return GST_FLOW_OK;

}

               Here buf which is passed is my decoder output buffer having
size = (width * height *1.5). I would like to replace memcpy seprated by
blue color in above function. Is there any possibility to assign buf pointer
directly to Y pointer which later go to color conversion. 

 

               I am laking of some understanding of buffer_alloc of base
sink. If any where I am wrong please correct me and try to guide me in right
direction. In other way I was thinking to use dma transfer, but I am
completely new for dma and will take much time to understand and write
transfer function. If I can get some other solution, will be helpful in my
project.

 

-Tejas.

 

 

From: Tejas [mailto:tejas at picus.in] 
Sent: Friday, March 26, 2010 3:33 PM
To: 'gstreamer-embedded at lists.sourceforge.net'
Subject: Need Help On gst-omapfb built from openembedded

 

Hello All,

               I am using gst-omapfb plugin built from openembedded which
contains X-overlay patch on normal omapfb plugin as my video sink. My normal
pipeline is as followed.

 

 

$gst-launch-0.10 filesrc location=1.mp4 ! myparser ! mydecoder ! omapfbsink.

 

Src pad of my decoder is set as following caps .

 

("video/x-raw-yuv",

 "width", G_TYPE_INT, mpeg4dec->info.width,

"height", G_TYPE_INT, mpeg4dec->info.height,

"framerate", GST_TYPE_FRACTION, mpeg4dec->fps_nu, mpeg4dec->fps_de,

"format", GST_TYPE_FOURCC, GST_MAKE_FOURCC ('I', '4', '2', '0'),

"pixel-aspect-ratio", GST_TYPE_FRACTION,1,1,i NULL);

 

               Omapfbsink will accept I420 format and convert it to UYVY
format  and copy it to frame buffer. In these all process it is using memcpy
which copy data from buffer pushed from my decoder to buffer allocated
locally. Here in omapfbsink memcpy is time consuming. Instead of using
memcpy I would like to use some other method. But I am getting how can I
replace memcpy. 

 

               If anyone can guide me to replace memcpy, I will be pleasure
for me.

 

 

-Tejas.

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