With the example saLoopBack ,I got the video captured(720p) and displayed correctly.
And I want to change it to display captured video with DVO2.
Here is what I have made some changes with the saLoopBack example.
The changed parts are marked red below.
/*
* saLoopBack.c
*/
static int initCapture(void)
{
int mode = O_RDWR;
/* Open capture driver */
capt.fd = open((const char *)CAPTURE_DEVICE, mode);
if (capt.fd == -1) {
printf("failed to open capture device\n");
return -1;
}
/* Query for capabilities */
if (ioctl(capt.fd, VIDIOC_QUERYCAP, &capt.cap)) {
printf("Query capability failed\n");
exit(2);
} else {
printf("Driver Name: %s\n", capt.cap.driver);
printf("Driver bus info: %s\n", capt.cap.bus_info);
if (capt.cap.capabilities & V4L2_CAP_VIDEO_CAPTURE)
printf("Driver is capable of doing capture\n");
if (capt.cap.capabilities & V4L2_CAP_VIDEO_OVERLAY)
printf("Driver is capabled of scaling and cropping\n");
}
system("echo 0 > /sys/devices/platform/vpss/display1/enabled");
/* Query the preset. Set it to invalid and query for it */
capt.dv_preset.preset = 0x0;
if (ioctl(capt.fd, VIDIOC_QUERY_DV_PRESET, &capt.dv_preset)) {
printf("Querying DV Preset failed\n");
exit(2);
}
switch (capt.dv_preset.preset) {
case V4L2_DV_720P60:
printf("%s:\n Mode set is 720P60\n", APP_NAME);
system ("echo 720p-60 > /sys/devices/platform/vpss/display1/mode");
break;
case V4L2_DV_1080I60:
printf("%s:\n Mode set is 1080I60\n", APP_NAME);
system ("echo 1080i-60 > /sys/devices/platform/vpss/display1/mode");
break;
case V4L2_DV_1080P60:
printf("%s:\n Mode set is 1080P60\n", APP_NAME);
system ("echo 1080p-60 > /sys/devices/platform/vpss/display1/mode");
break;
case V4L2_DV_1080P30:
printf("%s:\n Mode set is 1080P30\n", APP_NAME);
system ("echo 1080p-30 > /sys/devices/platform/vpss/display1/mode");
break;
default:
printf("%s:\n Mode set is %d\n", APP_NAME, capt.dv_preset.preset);
}
if (ioctl(capt.fd, VIDIOC_S_DV_PRESET, &capt.dv_preset)) {
printf("Setting DV Preset failed\n");
exit(2);
}
system("echo 1 > /sys/devices/platform/vpss/display1/enabled");
return 0;
}
/* Main function */
int main(int argc, char *argv[])
{
int i = 0, ret = 0;
struct v4l2_buffer temp_buf;
struct timeval before, after, result;
/* Divert fbdev to dvo2 so that it does not do blending with display*/
//system ("echo 1:dvo2 > /sys/devices/platform/vpss/graphics0/nodes");
system("echo vcompmux:dvo2 > /sys/devices/platform/vpss/video0/nodes");
/* Open the capture driver. Query the resolution from the capture driver
*/
ret = initCapture();
if (ret < 0) {
printf("Error in opening capture device for channel 0\n");
return ret;
}
/* Open the Display driver. */
ret = initDisplay();
if (ret < 0) {
printf("Error in opening display device for channel 0\n");
return ret;
}
restart:
/* Setup the capture driver Step includes
* Set the format according to the resolution queried.
* request for buffer descriptors for userpointer buffers
*/
ret = setupCapture();
if (ret < 0) {
printf("Error in setting up of capture\n");
return ret;
}
/* Setup the display driver Step includes
* Set the format according to the resolution queried by capture.
* request for buffer descriptors for userpointer buffers
*/
ret = setupDisplay();
if (ret < 0) {
printf("Error in setting up of Display\n");
return ret;
}
/* As application works on userPointer, Buffers for both capture and
* display driver are allocated using the fbdev, buffers. Below functionality
* setups the fbdev to mmap the buffers and later capture and display
* will use those buffers
*/
ret = setupBuffers();
if (ret < 0) {
printf("Error in setting up of Buffers\n");
return ret;
}
/* Total 8 buffers are allocated using fbdev, 4 buffers are primed to
* capture driver.
*/
ret = queueCaptureBuffers();
if (ret < 0) {
printf("Error in queuing capture buffers\n");
return ret;
}
/* Total 8 buffers are allocated using fbdev, 4 buffers are primed to
* display driver.
*/
ret = queueDisplayBuffers();
if (ret < 0) {
printf("Error in queuing display buffers\n");
return ret;
}
/* Start display driver always first. This is because display driver
* takes 2 frames to come out of start. If capture is started first
* frame drops will be seen, since capture will already complete two
* frame by time display starts
*/
ret = startDisplay();
if (ret < 0) {
printf("Error starring capture \n");
return ret;
}
/* Start capture driver after display driver */
ret = startCapture();
if (ret < 0) {
printf("Error starring capture \n");
return ret;
}
/* Get time of day to calculate FPS */
gettimeofday(&before, NULL);
/* Start the steady state loop. Following steps are followed
* 1 dequeue buffer from capture
* 2 dequeue buffer from display
* 3 exchange capture and display buffer pointers
* 4 queue dislay buffer pointer to capture
* 5 queue capture buffer pointer to display
*/
for (i = 0; i < MAXLOOPCOUNT; i++) {
/* Dq capture buffer */
ret = ioctl(capt.fd, VIDIOC_DQBUF, &capt.buf);
if (ret < 0) {
perror("VIDIOC_DQBUF\n");
return -1;
}
// printf("%d\n",i);
/* Because of IP bugs, capture hardware gets locked up once in
* a while. In that case DQbuf will return V4L2_BUF_FLAG_ERROR
* in flags.
*/
if (capt.buf.flags & V4L2_BUF_FLAG_ERROR) {
/* If DQbuf returned error check for the hardware lockup
*/
ret = ioctl(capt.fd, TICAPT_CHECK_OVERFLOW, &capt.over_flow);
if (ret < 0) {
perror("TICAPT_CHECK_OVERFLOW\n");
return -1;
} else {
/* If hardware locked up, restart display and
* capture driver
*/
if (capt.over_flow.porta_overflow) {
printf("Port a overflowed\n\n\n\n\n\n\n");
stopCapture();
stopDisplay();
goto restart;
}
if (capt.over_flow.portb_overflow) {
printf("Port b overflowed\n\n\n\n\n\n\n");
stopCapture();
stopDisplay();
goto restart;
}
}
}
/* DQ display buffer */
ret = ioctl(disp.fd, VIDIOC_DQBUF, &disp.buf);
if (ret < 0) {
perror("VIDIOC_DQBUF Display\n");
return -1;
}
/* Exchange display and capture buffer pointers */
temp_buf.m.userptr = capt.buf.m.userptr;
capt.buf.m.userptr = disp.buf.m.userptr;
disp.buf.m.userptr = temp_buf.m.userptr;
/* Queue the capture buffer with updated address */
ret = ioctl(capt.fd, VIDIOC_QBUF, &capt.buf);
if (ret < 0) {
perror("VIDIOC_QBUF\n");
return -1;
}
disp.buf.type = V4L2_BUF_TYPE_VIDEO_OUTPUT;
disp.buf.memory = V4L2_MEMORY_USERPTR;
disp.buf.length = capt.fmt.fmt.pix.sizeimage;
/* Queue the display buffer back with updated address */
ret = ioctl(disp.fd, VIDIOC_QBUF, &disp.buf);
if (ret < 0) {
perror("VIDIOC_QBUF Display\n");
return -1;
}
if ((i % 1000) == 0)
printf("Count=%d\n", i);
}
/* Get end time to calculate FPS */
gettimeofday(&after, NULL);
/* Calculate FPS */
calc_result_time(&result, &after, &before);
printf("Frame rate = %lu\n", MAXLOOPCOUNT/result.tv_sec);
/* Stop capture driver */
ret = stopCapture();
if (ret < 0) {
printf("Error in stopping capture\n");
return ret;
}
/* Stop display driver */
ret = stopDisplay();
if (ret < 0) {
printf("Error in stopping display\n");
return ret;
}
/* Deinit capture driver */
ret = deInitCapture();
if (ret < 0) {
printf("Error in capture deInit\n");
return ret;
}
/* Deinit display driver */
ret = deInitDisplay();
if (ret < 0) {
printf("Error in display deInit\n");
return ret;
}
close(fbdev_fd);
system("echo 0 > /sys/devices/platform/vpss/display1/enabled");
system ("echo 1080p-60 > /sys/devices/platform/vpss/display1/mode");
// system("echo 0 > /sys/devices/platform/vpss/display0/enabled");
system("echo vcompmux:hdmi > /sys/devices/platform/vpss/video0/nodes");
// system("echo 0 > /sys/devices/platform/vpss/graphics0/enabled");
// system("echo 1 > /sys/devices/platform/vpss/display0/enabled");
system("echo 1 > /sys/devices/platform/vpss/display1/enabled");
// system("echo 1:hdmi > /sys/devices/platform/vpss/graphics0/nodes");
return 0;
}
When run on the dm8168evm, nothing displayed through the on-chip-hdmi or sonboard hdmi output.
Here is what I got on the terminal.
root@dm816x-evm:~# ./saLoopBack
Driver Name: ti81xxvin
Driver bus info: TI81xx Platform
Driver is capable of doing capture
saLoopBack:
Mode set is 720P60
Driver Name:
Driver bus info: �Ѓ@@`
=============================================================
Capture Format:
=============================================================
fmt.type = 1
fmt.width = 1280
fmt.height = 720
fmt.pixelformat = 1448695129
fmt.bytesperline = 2560
fmt.sizeimage = 1843200
=============================================================
=============================================================
Display Format:
=============================================================
fmt.type = 2
fmt.width = 1280
fmt.height = 720
fmt.pixelformat = 1448695129
fmt.bytesperline = 2560
fmt.sizeimage = 1843200
=============================================================
Count=0
Frame rate = 62
I don't know where problems lay.
Hope for your help.
