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-rw-r--r--v4l2-drm-example/dmabuf-sharing.c186
1 files changed, 147 insertions, 39 deletions
diff --git a/v4l2-drm-example/dmabuf-sharing.c b/v4l2-drm-example/dmabuf-sharing.c
index d1f93f4..5e1fb6a 100644
--- a/v4l2-drm-example/dmabuf-sharing.c
+++ b/v4l2-drm-example/dmabuf-sharing.c
@@ -75,6 +75,7 @@ struct setup {
uint32_t crtId;
char modestr[32];
char video[32];
+ unsigned int use_plane : 1;
unsigned int w, h;
unsigned int use_wh : 1;
unsigned int in_fourcc;
@@ -90,12 +91,20 @@ struct drm_device {
const char *module;
int fd;
+ int crtc_index;
unsigned int crtc_id;
unsigned int con_id;
+ unsigned int plane_id;
+ drmModeConnector *connector;
drmModeModeInfo mode;
const char *modestr;
+
unsigned int format;
+ unsigned int width;
+ unsigned int height;
+
+ struct v4l2_rect compose;
};
struct v4l2_device {
@@ -134,6 +143,7 @@ static void usage(char *name)
fprintf(stderr, "\nDisplay options:\n\n");
fprintf(stderr, "\t-M <drm-module>\tset DRM module\n");
fprintf(stderr, "\t-o <connector_id>:<crtc_id>:<mode>\tset a mode\n");
+ fprintf(stderr, "\t-p <connector_id>:<crtc_id>\toutput to a plane\n");
fprintf(stderr, "\t-F <fourcc>\tset output format using 4cc\n");
fprintf(stderr, "\t-t <width,height>@<left,top>\tset compose area\n");
@@ -160,7 +170,7 @@ static int parse_args(int argc, char *argv[], struct setup *s)
strcpy(s->video, "/dev/video0");
- while ((c = getopt(argc, argv, "b:F:f:hi:M:o:S:s:t:")) != -1) {
+ while ((c = getopt(argc, argv, "b:F:f:hi:M:o:p:S:s:t:")) != -1) {
switch (c) {
case 'b':
ret = sscanf(optarg, "%u", &s->buffer_count);
@@ -199,6 +209,12 @@ static int parse_args(int argc, char *argv[], struct setup *s)
if (WARN_ON(ret != 3, "incorrect mode description\n"))
return -1;
break;
+ case 'p':
+ ret = sscanf(optarg, "%u:%u", &s->conId, &s->crtId);
+ if (WARN_ON(ret != 2, "incorrect plane description\n"))
+ return -1;
+ s->use_plane = 1;
+ break;
case 'S':
ret = sscanf(optarg, "%u,%u", &s->w, &s->h);
if (WARN_ON(ret != 2, "incorrect input size\n"))
@@ -275,52 +291,108 @@ fail_gem:
return -1;
}
-static int drm_find_mode(struct drm_device *dev, drmModeModeInfo *m)
+static int drm_find_crtc(struct drm_device *dev)
{
int ret = -1;
+
drmModeRes *res = drmModeGetResources(dev->fd);
if (WARN_ON(!res, "drmModeGetResources failed: %s\n", ERRSTR))
return -1;
if (WARN_ON(res->count_crtcs <= 0, "drm: no crts\n"))
- goto fail_res;
+ goto done;
+
+ dev->crtc_index = -1;
+
+ for (int i = 0; i < res->count_crtcs; ++i) {
+ if (dev->crtc_id == res->crtcs[i]) {
+ dev->crtc_index = i;
+ break;
+ }
+ }
+
+ if (WARN_ON(dev->crtc_index == -1, "drm: CRTC %u not found\n", dev->crtc_id))
+ goto done;
if (WARN_ON(res->count_connectors <= 0, "drm: no connectors\n"))
- goto fail_res;
+ goto done;
- drmModeConnector *c;
- c = drmModeGetConnector(dev->fd, dev->con_id);
- if (WARN_ON(!c, "drmModeGetConnector failed: %s\n", ERRSTR))
- goto fail_res;
+ dev->connector = drmModeGetConnector(dev->fd, dev->con_id);
+ if (WARN_ON(!dev->connector, "drmModeGetConnector failed: %s\n", ERRSTR))
+ goto done;
+
+ ret = 0;
+
+done:
+ drmModeFreeResources(res);
+ return ret;
+}
+
+static int drm_find_mode(struct drm_device *dev, drmModeModeInfo *m)
+{
+ drmModeConnector *c = dev->connector;
if (WARN_ON(!c->count_modes, "connector supports no mode\n"))
- goto fail_conn;
+ return -1;
- drmModeModeInfo *found = NULL;
for (int i = 0; i < c->count_modes; ++i) {
if (strcmp(c->modes[i].name, dev->modestr) == 0) {
- found = &c->modes[i];
- break;
+ *m = c->modes[i];
+ return 0;
}
}
- if (WARN_ON(!found, "mode %s not supported\n", dev->modestr)) {
- fprintf(stderr, "Valid modes:");
- for (int i = 0; i < c->count_modes; ++i)
- fprintf(stderr, " %s", c->modes[i].name);
- fprintf(stderr, "\n");
- goto fail_conn;
- }
+ WARN_ON(1, "mode %s not supported\n", dev->modestr);
+ fprintf(stderr, "Valid modes:");
+ for (int i = 0; i < c->count_modes; ++i)
+ fprintf(stderr, " %s", c->modes[i].name);
+ fprintf(stderr, "\n");
+ return -1;
+}
- memcpy(m, found, sizeof *found);
- ret = 0;
+/* Find an unused plane that supports the requested format */
+static int drm_find_plane(struct drm_device *dev)
+{
+ drmModePlaneResPtr planes;
+ drmModePlanePtr plane;
+ unsigned int i;
+ unsigned int j;
+ int ret = -1;
-fail_conn:
- drmModeFreeConnector(c);
+ planes = drmModeGetPlaneResources(dev->fd);
+ if (WARN_ON(!planes, "drmModeGetPlaneResources failed: %s\n", ERRSTR))
+ return -1;
-fail_res:
- drmModeFreeResources(res);
+ for (i = 0; i < planes->count_planes; ++i) {
+ plane = drmModeGetPlane(dev->fd, planes->planes[i]);
+ if (WARN_ON(!planes, "drmModeGetPlane failed: %s\n", ERRSTR))
+ break;
+
+ if (plane->crtc_id)
+ continue;
+
+ if (!(plane->possible_crtcs & (1 << dev->crtc_index))) {
+ drmModeFreePlane(plane);
+ continue;
+ }
+
+ for (j = 0; j < plane->count_formats; ++j) {
+ if (plane->formats[j] == dev->format)
+ break;
+ }
+ if (j == plane->count_formats) {
+ drmModeFreePlane(plane);
+ continue;
+ }
+
+ dev->plane_id = plane->plane_id;
+ drmModeFreePlane(plane);
+ ret = 0;
+ break;
+ }
+
+ drmModeFreePlaneResources(planes);
return ret;
}
@@ -339,17 +411,45 @@ static void drm_init(struct drm_device *dev, const struct v4l2_pix_format *fmt,
}
printf("buffers ready\n");
- ret = drm_find_mode(dev, &dev->mode);
- BYE_ON(ret, "failed to find valid mode\n");
+ ret = drm_find_crtc(dev);
+ BYE_ON(ret, "failed to find CRTC and/or connector\n");
+
+ if (dev->modestr[0]) {
+ ret = drm_find_mode(dev, &dev->mode);
+ BYE_ON(ret, "failed to find valid mode\n");
+
+ ret = drmModeSetCrtc(dev->fd, dev->crtc_id, buffers[0].fb_handle,
+ 0, 0, &dev->con_id, 1, &dev->mode);
+ BYE_ON(ret, "drmModeSetCrtc failed: %s\n", ERRSTR);
+ } else {
+ ret = drm_find_plane(dev);
+ BYE_ON(ret, "failed to find compatible plane\n");
+ }
}
static void drm_page_flip(struct drm_device *dev, struct buffer *buffer)
{
int ret;
- ret = drmModePageFlip(dev->fd, dev->crtc_id, buffer->fb_handle,
- DRM_MODE_PAGE_FLIP_EVENT, (void*)(unsigned long)buffer->index);
- BYE_ON(ret, "drmModePageFlip failed: %s\n", ERRSTR);
+ if (dev->plane_id) {
+ ret = drmModeSetPlane(dev->fd, dev->plane_id, dev->crtc_id,
+ buffer->fb_handle, 0,
+ dev->compose.left, dev->compose.top,
+ dev->compose.width, dev->compose.height,
+ 0, 0, dev->width << 16, dev->height << 16);
+ BYE_ON(ret, "drmModeSetPlane failed: %s\n", ERRSTR);
+
+ drmVBlank vblank;
+ vblank.request.type = DRM_VBLANK_EVENT | DRM_VBLANK_RELATIVE;
+ vblank.request.sequence = 1;
+ vblank.request.signal = (unsigned long)buffer->index;
+ ret = drmWaitVBlank(dev->fd, &vblank);
+ BYE_ON(ret, "drmWaitVBlank failed: %s\n", ERRSTR);
+ } else {
+ ret = drmModePageFlip(dev->fd, dev->crtc_id, buffer->fb_handle,
+ DRM_MODE_PAGE_FLIP_EVENT, (void*)(unsigned long)buffer->index);
+ BYE_ON(ret, "drmModePageFlip failed: %s\n", ERRSTR);
+ }
}
static void v4l2_init(struct v4l2_device *dev, unsigned int num_buffers)
@@ -481,19 +581,18 @@ int main(int argc, char *argv[])
drm.module = s.module;
drm.modestr = s.modestr;
drm.format = s.out_fourcc;
+ drm.width = v4l2.format.width;
+ drm.height = v4l2.format.height;
drm.crtc_id = s.crtId;
drm.con_id = s.conId;
drm_init(&drm, &v4l2.format, s.buffer_count, buffers);
- ret = drmModeSetCrtc(drm.fd, drm.crtc_id, buffers[0].fb_handle, 0, 0,
- &drm.con_id, 1, &drm.mode);
- BYE_ON(ret, "drmModeSetCrtc failed: %s\n", ERRSTR);
-
- /* The first buffer is used for the initial CRTC frame buffer. Enqueue
- * all others to V4L2.
+ /* When using the CRTC the first buffer is used for the initial CRTC
+ * frame buffer. Enqueue all other buffers to V4L2. When using a plane
+ * enqueue all buffers to V4L2.
*/
- for (unsigned int i = 1; i < s.buffer_count; ++i)
+ for (unsigned int i = drm.plane_id ? 0 : 1; i < s.buffer_count; ++i)
v4l2_queue_buffer(&v4l2, &buffers[i]);
int type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
@@ -507,10 +606,19 @@ int main(int argc, char *argv[])
/* buffer currently used by drm */
stream.v4l2 = &v4l2;
- stream.current_buffer = 0;
+ stream.current_buffer = drm.plane_id ? -1 : 0;
stream.buffers = buffers;
stream.num_buffers = s.buffer_count;
+ if (!s.use_compose) {
+ drm.compose.left = 0;
+ drm.compose.top = 0;
+ drm.compose.width = v4l2.format.width;
+ drm.compose.height = v4l2.format.height;
+ } else {
+ drm.compose = s.compose;
+ }
+
while ((ret = poll(fds, 2, 5000)) > 0) {
if (fds[0].revents & POLLIN) {
struct buffer *buffer;
@@ -524,6 +632,7 @@ int main(int argc, char *argv[])
memset(&evctx, 0, sizeof evctx);
evctx.version = DRM_EVENT_CONTEXT_VERSION;
evctx.page_flip_handler = page_flip_handler;
+ evctx.vblank_handler = page_flip_handler;
ret = drmHandleEvent(drm.fd, &evctx);
BYE_ON(ret, "drmHandleEvent failed: %s\n", ERRSTR);
@@ -532,4 +641,3 @@ int main(int argc, char *argv[])
return 0;
}
-
generated by cgit v1.2.3 (git 2.25.1) at 2024-12-25 05:20:39 +0000