util: vpe: vpe specific common functions

used to integrate vpe with other modules.

Input buffer must be allocated in application, queue it to vpe
by passing buffer index

Output buffer allocated in vpe_output_init() as vpe output intended
to display on LCD.

Signed-off-by: alaganraj <alaganraj.s@ti.com>

diff --git a/util/Makefile.am b/util/Makefile.am
index 099845b447e041fd2fb7885212febe8a3a9eb292..7b672877e410e201a7896bdf4becb453d8425e32 100644 (file)
--- a/util/Makefile.am
+++ b/util/Makefile.am
@@ -19,7 +19,8 @@ noinst_LTLIBRARIES = libutil.la
 
 libutil_la_SOURCES = \
        display-kms.c \
-       util.c
+       util.c \
+       vpe-common.c
 
 if ENABLE_V4L2_DMABUF
 libutil_la_SOURCES += v4l2.c

diff --git a/util/vpe-common.c b/util/vpe-common.c
new file mode 100755 (executable)
index 0000000..164f7a2
--- /dev/null
+++ b/util/vpe-common.c
@@ -0,0 +1,679 @@
+/*
+ *  Copyright (c) 2013-2014, Texas Instruments Incorporated
+ *  Author: alaganraj <alaganraj.s@ti.com>
+ *
+ *  Redistribution and use in source and binary forms, with or without
+ *  modification, are permitted provided that the following conditions
+ *  are met:
+ *
+ *  *  Redistributions of source code must retain the above copyright
+ *     notice, this list of conditions and the following disclaimer.
+ *
+ *  *  Redistributions in binary form must reproduce the above copyright
+ *     notice, this list of conditions and the following disclaimer in the
+ *     documentation and/or other materials provided with the distribution.
+ *
+ *  *  Neither the name of Texas Instruments Incorporated nor the names of
+ *     its contributors may be used to endorse or promote products derived
+ *     from this software without specific prior written permission.
+ *
+ *  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ *  AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
+ *  THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ *  PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
+ *  CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ *  EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ *  PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
+ *  OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ *  WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
+ *  OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
+ *  EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ *  Contact information for paper mail:
+ *  Texas Instruments
+ *  Post Office Box 655303
+ *  Dallas, Texas 75265
+ *  Contact information:
+ *  http://www-k.ext.ti.com/sc/technical-support/product-information-centers.htm?
+ *  DCMP=TIHomeTracking&HQS=Other+OT+home_d_contact
+ *  ============================================================================
+ *
+ */
+
+/*
+ * @File        vpe-common.c
+ * @Brief       vpe specific common functions, used to integrate vpe 
+ *             with other modules.
+ *
+ *             Input buffer must be allocated in application, queue it to vpe 
+ *             by passing buffer index
+ *             
+ *             Output buffer allocated in vpe_output_init() as vpe output intended
+ *             to display on LCD.
+ */
+#include <stdio.h>
+#include <stdlib.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <stdint.h>
+#include <string.h>
+#include <errno.h>
+
+#include <linux/videodev2.h>
+#include <linux/v4l2-controls.h>
+
+#include <sys/mman.h>
+#include <sys/ioctl.h>
+
+#include <xf86drm.h>
+#include <omap_drm.h>
+#include <omap_drmif.h>
+
+#include "util.h"
+
+#define pexit(fmt, arg...) { \
+               printf(fmt, ## arg); \
+               exit(1); \
+}
+
+#define V4L2_CID_TRANS_NUM_BUFS         (V4L2_CID_PRIVATE_BASE)
+#define NUMBUF                          6
+
+//#define vpe_debug
+
+#ifdef vpe_debug
+#define dprintf(fmt, arg...) printf(fmt, ## arg)
+#else
+#define dprintf(fmt, arg...) do {} while(0)
+#endif
+
+struct image_params {
+       int width;
+       int height;
+       int fourcc;
+       int size;
+       int size_uv;
+       int coplanar;
+       enum v4l2_colorspace colorspace;
+       int numbuf;
+};
+
+struct vpe {
+       int fd;
+       int field;
+       int deint;
+       int translen;
+       struct image_params src;
+       struct image_params dst;
+       struct  v4l2_crop crop;
+       int input_buf_dmafd[NUMBUF];
+       int input_buf_dmafd_uv[NUMBUF];
+       int output_buf_dmafd[NUMBUF];
+       struct display *disp;
+       struct buffer **disp_bufs;
+};
+
+/**
+ *****************************************************************************
+ * @brief:  open the device
+ *
+ * @return: vpe  struct vpe pointer 
+ *****************************************************************************
+*/
+struct vpe *vpe_open(void)
+{
+       char devname[20] = "/dev/video0";
+       struct vpe *vpe;
+
+       vpe = calloc(1, sizeof(*vpe));
+
+       vpe->fd =  open(devname, O_RDWR);
+        if(vpe->fd < 0)
+                pexit("Cant open %s\n", devname);
+
+        printf("vpe:%s open success!!!\n", devname);
+
+       return vpe;
+}
+
+/**
+ *****************************************************************************
+ * @brief:  close the device and free memory
+ *
+ * @param:  vpe  struct vpe pointer
+ *
+ * @return: 0 on success 
+ *****************************************************************************
+*/
+int vpe_close(struct vpe *vpe)
+{
+       close(vpe->fd);
+       free(vpe);
+       
+       return 0;
+}
+
+/**
+ *****************************************************************************
+ * @brief:  fills 4cc, size, coplanar, colorspace based on command line input 
+ *
+ * @param:  format  char pointer
+ * @param:  image  struct image_params pointer
+ *
+ * @return: 0 on success 
+ *****************************************************************************
+*/
+int describeFormat (char *format, struct image_params *image)
+{
+        image->size   = -1;
+        image->fourcc = -1;
+        if (strcmp (format, "rgb24") == 0) {
+                image->fourcc = V4L2_PIX_FMT_RGB24;
+                image->size = image->height * image->width * 3;
+                image->coplanar = 0;
+                image->colorspace = V4L2_COLORSPACE_SRGB;
+
+        } else if (strcmp (format, "bgr24") == 0) {
+                image->fourcc = V4L2_PIX_FMT_BGR24;
+                image->size = image->height * image->width * 3;
+                image->coplanar = 0;
+                image->colorspace = V4L2_COLORSPACE_SRGB;
+
+        } else if (strcmp (format, "argb32") == 0) {
+                image->fourcc = V4L2_PIX_FMT_RGB32;
+                image->size = image->height * image->width * 4;
+                image->coplanar = 0;
+                image->colorspace = V4L2_COLORSPACE_SRGB;
+
+        } else if (strcmp (format, "abgr32") == 0) {
+                image->fourcc = V4L2_PIX_FMT_BGR32;
+                image->size = image->height * image->width * 4;
+                image->coplanar = 0;
+                image->colorspace = V4L2_COLORSPACE_SRGB;
+
+        } else if (strcmp (format, "yuv444") == 0) {
+                image->fourcc = V4L2_PIX_FMT_YUV444;
+                image->size = image->height * image->width * 3;
+                image->coplanar = 0;
+                image->colorspace = V4L2_COLORSPACE_SMPTE170M;
+
+        } else if (strcmp (format, "yvyu") == 0) {
+                image->fourcc = V4L2_PIX_FMT_YVYU;
+                image->size = image->height * image->width * 2;
+                image->coplanar = 0;
+                image->colorspace = V4L2_COLORSPACE_SMPTE170M;
+
+        } else if (strcmp (format, "yuyv") == 0) {
+                image->fourcc = V4L2_PIX_FMT_YUYV;
+                image->size = image->height * image->width * 2;
+                image->coplanar = 0;
+                image->colorspace = V4L2_COLORSPACE_SMPTE170M;
+
+        } else if (strcmp (format, "uyvy") == 0) {
+                image->fourcc = V4L2_PIX_FMT_UYVY;
+                image->size = image->height * image->width * 2;
+                image->coplanar = 0;
+                image->colorspace = V4L2_COLORSPACE_SMPTE170M;
+
+        } else if (strcmp (format, "vyuy") == 0) {
+                image->fourcc = V4L2_PIX_FMT_VYUY;
+                image->size = image->height * image->width * 2;
+                image->coplanar = 0;
+                image->colorspace = V4L2_COLORSPACE_SMPTE170M;
+
+        } else if (strcmp (format, "nv16") == 0) {
+                image->fourcc = V4L2_PIX_FMT_NV16;
+                image->size = image->height * image->width * 2;
+                image->coplanar = 0;
+                image->colorspace = V4L2_COLORSPACE_SMPTE170M;
+
+        } else if (strcmp (format, "nv61") == 0) {
+                image->fourcc = V4L2_PIX_FMT_NV61;
+                image->size = image->height * image->width * 2;
+                image->coplanar = 0;
+                image->colorspace = V4L2_COLORSPACE_SMPTE170M;
+
+        } else if (strcmp (format, "nv12") == 0) {
+                image->fourcc = V4L2_PIX_FMT_NV12;
+                image->size = image->height * image->width * 1.5;
+                image->coplanar = 1;
+                image->colorspace = V4L2_COLORSPACE_SMPTE170M;
+
+        } else if (strcmp (format, "nv21") == 0) {
+                image->fourcc = V4L2_PIX_FMT_NV21;
+                image->size = image->height * image->width * 1.5;
+                image->coplanar = 1;
+                image->colorspace = V4L2_COLORSPACE_SMPTE170M;
+
+        } else {
+                return 0;
+
+        }
+
+        return 1;
+}
+
+/**
+ *****************************************************************************
+ * @brief:  sets crop parameters 
+ *
+ * @param:  vpe  struct vpe pointer
+ *
+ * @return: 0 on success 
+ *****************************************************************************
+*/
+static int set_crop(struct vpe *vpe)
+{
+       int ret = 0;
+       
+       if ((vpe->crop.c.top == 0) && (vpe->crop.c.left == 0) &&
+           (vpe->crop.c.width == 0) && (vpe->crop.c.height == 0)) {
+               dprintf("setting default crop params\n");
+               vpe->crop.c.top = 0;
+               vpe->crop.c.left = 0;
+               vpe->crop.c.width = vpe->src.width;
+               vpe->crop.c.height = vpe->src.height;
+               vpe->crop.type = V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE;
+       }
+
+       ret = ioctl(vpe->fd, VIDIOC_S_CROP, &vpe->crop);
+       if (ret < 0)
+               pexit("error setting crop\n");
+       
+       return 0;
+}
+
+/**
+ *****************************************************************************
+ * @brief:  sets control, howmany jobs to be handled on multi instance 
+ *
+ * @param:  vpe  struct vpe pointer
+ *
+ * @return: 0 on success 
+ *****************************************************************************
+*/
+static int set_ctrl(struct vpe *vpe)
+{
+       int ret;
+       struct  v4l2_control ctrl;
+
+       memset(&ctrl, 0, sizeof(ctrl));
+       ctrl.id = V4L2_CID_TRANS_NUM_BUFS;
+       ctrl.value = vpe->translen;
+       ret = ioctl(vpe->fd, VIDIOC_S_CTRL, &ctrl);
+       if (ret < 0)
+               pexit("vpe: S_CTRL failed\n");
+       
+       return 0;
+}
+
+/**
+ *****************************************************************************
+ * @brief:  Intialize the vpe input by calling set_control, set_format,
+ *         set_crop, refbuf ioctls
+ *
+ * @param:  vpe  struct vpe pointer
+ *
+ * @return: 0 on success 
+ *****************************************************************************
+*/
+int vpe_input_init(struct vpe *vpe)
+{
+       int ret;
+       struct v4l2_format fmt;
+       struct v4l2_requestbuffers rqbufs;
+
+       set_ctrl(vpe);
+               
+       memset(&fmt, 0, sizeof fmt);
+       fmt.type = V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE;
+
+       ret = ioctl(vpe->fd, VIDIOC_G_FMT, &fmt);
+       if (ret < 0)
+               pexit( "vpe i/p: G_FMT_1 failed: %s\n", strerror(errno));
+
+       fmt.fmt.pix_mp.width = vpe->src.width;
+       fmt.fmt.pix_mp.height = vpe->src.height;
+       fmt.fmt.pix_mp.pixelformat = vpe->src.fourcc;
+
+       switch (vpe->deint) {
+       case 1:
+               fmt.fmt.pix_mp.field = V4L2_FIELD_ALTERNATE;
+               break;
+       case 2:
+               fmt.fmt.pix_mp.field = V4L2_FIELD_SEQ_TB;
+               break;
+       case 0:
+       default:
+               fmt.fmt.pix_mp.field = V4L2_FIELD_ANY;
+               break;
+       }
+
+       ret = ioctl(vpe->fd, VIDIOC_S_FMT, &fmt);
+       if (ret < 0) {
+               pexit( "vpe i/p: S_FMT failed: %s\n", strerror(errno));
+       } else {
+                vpe->src.size = fmt.fmt.pix_mp.plane_fmt[0].sizeimage;
+                vpe->src.size_uv = fmt.fmt.pix_mp.plane_fmt[1].sizeimage;
+        }
+
+       ret = ioctl(vpe->fd, VIDIOC_G_FMT, &fmt);
+       if (ret < 0)
+               pexit( "vpe i/p: G_FMT_2 failed: %s\n", strerror(errno));
+
+       printf("vpe i/p: G_FMT: width = %u, height = %u, 4cc = %.4s\n",
+                       fmt.fmt.pix_mp.width, fmt.fmt.pix_mp.height,
+                       (char*)&fmt.fmt.pix_mp.pixelformat);
+
+       set_crop(vpe);
+
+       memset(&rqbufs, 0, sizeof(rqbufs));
+       rqbufs.count = NUMBUF;
+       rqbufs.type = V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE;
+       rqbufs.memory = V4L2_MEMORY_DMABUF;
+
+       ret = ioctl(vpe->fd, VIDIOC_REQBUFS, &rqbufs);
+       if (ret < 0)
+               pexit( "vpe i/p: REQBUFS failed: %s\n", strerror(errno));
+
+       vpe->src.numbuf = rqbufs.count;
+       dprintf("vpe i/p: allocated buffers = %d\n", rqbufs.count);
+       
+       return 0;
+
+}
+
+/**
+ *****************************************************************************
+ * @brief:  Initialize vpe output by calling set_format, reqbuf ioctls.
+ *         Also allocates buffer to display the vpe output. 
+ *
+ * @param:  vpe  struct vpe pointer
+ *
+ * @return: 0 on success 
+ *****************************************************************************
+*/
+int vpe_output_init(struct vpe *vpe)
+{
+       int ret, i;
+       struct v4l2_format fmt;
+       struct v4l2_requestbuffers rqbufs;
+
+       memset(&fmt, 0, sizeof fmt);
+       fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE;
+
+       ret = ioctl(vpe->fd, VIDIOC_G_FMT, &fmt);
+       if (ret < 0)
+               pexit( "vpe o/p: G_FMT_1 failed: %s\n", strerror(errno));
+
+       fmt.fmt.pix_mp.width = vpe->dst.width;
+       fmt.fmt.pix_mp.height = vpe->dst.height;
+       fmt.fmt.pix_mp.pixelformat = vpe->dst.fourcc;
+       fmt.fmt.pix_mp.field = V4L2_FIELD_ANY;
+
+       ret = ioctl(vpe->fd, VIDIOC_S_FMT, &fmt);
+       if (ret < 0)
+               pexit( "vpe o/p: S_FMT failed: %s\n", strerror(errno));
+
+       ret = ioctl(vpe->fd, VIDIOC_G_FMT, &fmt);
+       if (ret < 0)
+               pexit( "vpe o/p: G_FMT_2 failed: %s\n", strerror(errno));
+
+       printf("vpe o/p: G_FMT: width = %u, height = %u, 4cc = %.4s\n",
+                       fmt.fmt.pix_mp.width, fmt.fmt.pix_mp.height,
+                       (char*)&fmt.fmt.pix_mp.pixelformat);
+
+       memset(&rqbufs, 0, sizeof(rqbufs));
+       rqbufs.count = NUMBUF;
+       rqbufs.type = V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE;
+       rqbufs.memory = V4L2_MEMORY_DMABUF;
+
+       ret = ioctl(vpe->fd, VIDIOC_REQBUFS, &rqbufs);
+       if (ret < 0)
+               pexit( "vpe o/p: REQBUFS failed: %s\n", strerror(errno));
+
+       vpe->dst.numbuf = rqbufs.count;
+       dprintf("vpe o/p: allocated buffers = %d\n", rqbufs.count);
+       
+       vpe->disp_bufs = disp_get_vid_buffers(vpe->disp, NUMBUF, vpe->dst.fourcc, 
+                                             vpe->dst.width, vpe->dst.height);
+       if (!vpe->disp_bufs)
+               pexit("allocating display buffer failed\n");
+
+       for (i = 0; i < NUMBUF; i++) {
+               vpe->output_buf_dmafd[i] = omap_bo_dmabuf(vpe->disp_bufs[i]->bo[0]);
+               vpe->disp_bufs[i]->fd[0] = vpe->output_buf_dmafd[i];
+               /* display only image widthxheight, no full screen */
+               vpe->disp_bufs[i]->noScale = true;
+               dprintf("vpe->disp_bufs_fd[%d] = %d\n", i, vpe->output_buf_dmafd[i]);
+       }
+
+       dprintf("allocating display buffer success\n");
+       return 0;
+}
+
+/**
+ *****************************************************************************
+ * @brief:  queue buffer to vpe input 
+ *
+ * @param:  vpe  struct vpe pointer
+ * @param:  index  buffer index to queue
+ *
+ * @return: 0 on success 
+ *****************************************************************************
+*/
+int vpe_input_qbuf(struct vpe *vpe, int index)
+{
+       int ret, i;
+       struct v4l2_buffer buf;
+       struct v4l2_plane planes[2];
+
+       dprintf("vpe input buffer queue\n");
+
+       memset(&buf, 0, sizeof buf);
+       memset(&planes, 0, sizeof planes);
+
+       planes[0].length = planes[0].bytesused = vpe->src.size;
+       if(vpe->src.coplanar)
+               planes[1].length = planes[1].bytesused = vpe->src.size_uv;
+
+       planes[0].data_offset = planes[1].data_offset = 0;
+
+       buf.type = V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE;
+       buf.memory = V4L2_MEMORY_DMABUF;
+       buf.index = index;
+       buf.m.planes = &planes;
+       buf.field = vpe->field;
+       if(vpe->src.coplanar)
+               buf.length = 2;
+       else
+               buf.length = 1;
+
+       buf.m.planes[0].m.fd = vpe->input_buf_dmafd[index];
+       if(vpe->src.coplanar)
+               buf.m.planes[1].m.fd = vpe->input_buf_dmafd_uv[index];
+
+       ret = ioctl(vpe->fd, VIDIOC_QBUF, &buf);
+       if (ret < 0)
+               pexit( "vpe i/p: QBUF failed: %s, index = %d\n",
+                       strerror(errno), index);
+
+       return 0;
+}
+
+/**
+ *****************************************************************************
+ * @brief:  queue buffer to vpe output 
+ *
+ * @param:  vpe  struct vpe pointer
+ * @param:  index  buffer index to queue
+ *
+ * @return: 0 on success 
+ *****************************************************************************
+*/
+int vpe_output_qbuf(struct vpe *vpe, int index)
+{
+       int ret, i;
+       struct v4l2_buffer buf;
+       struct v4l2_plane planes[2];
+
+       dprintf("vpe output buffer queue\n");
+
+       memset(&buf, 0, sizeof buf);
+       memset(&planes, 0, sizeof planes);
+
+       buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE;
+       buf.memory = V4L2_MEMORY_DMABUF;
+       buf.index = index;
+       buf.m.planes = &planes;
+       buf.length = 2;
+
+       buf.m.planes[0].m.fd = vpe->output_buf_dmafd[index];
+
+       ret = ioctl(vpe->fd, VIDIOC_QBUF, &buf);
+       if (ret < 0)
+               pexit( "vpe o/p: QBUF failed: %s, index = %d\n",
+                       strerror(errno), index);
+
+       return 0;
+}
+
+/**
+ *****************************************************************************
+ * @brief:  start stream 
+ *
+ * @param:  fd  device fd
+ * @param:  type  buffer type (CAPTURE or OUTPUT)
+ *
+ * @return: 0 on success 
+ *****************************************************************************
+*/
+int stream_ON(int fd, int type)
+{
+       int ret;
+
+       ret = ioctl(fd, VIDIOC_STREAMON, &type);
+       if (ret < 0)
+               pexit("STREAMON failed,  %d: %s\n", type, strerror(errno));
+
+       dprintf("stream ON: done! fd = %d,  type = %d\n", fd, type);
+
+       return 0;
+}
+
+/**
+ *****************************************************************************
+ * @brief:  stop stream 
+ *
+ * @param:  fd  device fd
+ * @param:  type  buffer type (CAPTURE or OUTPUT)
+ *
+ * @return: 0 on success 
+ *****************************************************************************
+*/
+int stream_OFF(int fd, int type)
+{
+       int ret;
+
+       ret = ioctl(fd, VIDIOC_STREAMOFF, &type);
+       if (ret < 0)
+               pexit("STREAMOFF failed, %d: %s\n", type, strerror(errno));
+
+       dprintf("stream OFF: done! fd = %d,  type = %d\n", fd, type);
+
+       return 0;
+}
+
+/**
+ *****************************************************************************
+ * @brief:  dequeue vpe input buffer  
+ *
+ * @param:  vpe  struct vpe pointer
+ *
+ * @return: buf.index index of dequeued buffer
+ *****************************************************************************
+*/
+int vpe_input_dqbuf(struct vpe *vpe)
+{
+       int ret;
+       struct v4l2_buffer buf;
+       struct v4l2_plane planes[2];
+       
+       dprintf("vpe input dequeue buffer\n");
+       
+       memset(&buf, 0, sizeof buf);
+       memset(&planes, 0, sizeof planes);
+
+       buf.type = V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE;
+       buf.memory = V4L2_MEMORY_DMABUF;
+        buf.m.planes = &planes;
+        if(vpe->src.coplanar)
+               buf.length = 2;
+       else 
+               buf.length = 1;
+       ret = ioctl(vpe->fd, VIDIOC_DQBUF, &buf);
+       if (ret < 0)
+               pexit("vpe i/p: DQBUF failed: %s\n", strerror(errno));
+
+       dprintf("vpe i/p: DQBUF index = %d\n", buf.index);
+
+       return buf.index;
+}
+
+/**
+ *****************************************************************************
+ * @brief:  dequeue vpe output buffer
+ *
+ * @param:  vpe  struct vpe pointer
+ *
+ * @return: buf.index index of dequeued buffer
+ *****************************************************************************
+*/
+int vpe_output_dqbuf(struct vpe *vpe)
+{
+       int ret;
+       struct v4l2_buffer buf;
+       struct v4l2_plane planes[2];
+
+       dprintf("vpe output dequeue buffer\n");
+
+       memset(&buf, 0, sizeof buf);
+       memset(&planes, 0, sizeof planes);
+
+       buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE;
+       buf.memory = V4L2_MEMORY_DMABUF;
+        buf.m.planes = &planes;
+        buf.length = 1;
+       ret = ioctl(vpe->fd, VIDIOC_DQBUF, &buf);
+       if (ret < 0)
+               pexit("vpe o/p: DQBUF failed: %s\n", strerror(errno));
+
+       dprintf("vpe o/p: DQBUF index = %d\n", buf.index);
+
+       return buf.index;
+}
+
+/**
+ *****************************************************************************
+ * @brief:  buffer retried by index and displays the contents
+ *
+ * @param:  vpe  struct vpe pointer
+ * @param: index index of dequeued output buffer
+ *
+ * @return: 0 on success 
+ *****************************************************************************
+*/
+int display_buffer(struct vpe *vpe, int index)
+{
+       int ret;
+       struct buffer *buf;
+       
+       buf = vpe->disp_bufs[index];
+       ret = disp_post_vid_buffer(vpe->disp, buf, 0, 0, vpe->dst.width,
+                                  vpe->dst.height);
+       if (ret)
+               pexit("disp post vid buf failed\n");
+
+       return 0;
+}
+