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-rw-r--r--v4l2-drm-example/dmabuf-sharing.c234
1 files changed, 138 insertions, 96 deletions
diff --git a/v4l2-drm-example/dmabuf-sharing.c b/v4l2-drm-example/dmabuf-sharing.c
index d72b6d9..da83eb7 100644
--- a/v4l2-drm-example/dmabuf-sharing.c
+++ b/v4l2-drm-example/dmabuf-sharing.c
@@ -86,6 +86,25 @@ struct setup {
struct v4l2_rect compose;
};
+struct drm_device {
+ const char *module;
+ int fd;
+
+ unsigned int crtc_id;
+ unsigned int con_id;
+
+ drmModeModeInfo mode;
+ const char *modestr;
+ unsigned int format;
+};
+
+struct v4l2_device {
+ const char *devname;
+ int fd;
+
+ struct v4l2_pix_format format;
+};
+
struct buffer {
unsigned int bo_handle;
unsigned int fb_handle;
@@ -93,10 +112,12 @@ struct buffer {
};
struct stream {
- int v4lfd;
+ struct drm_device *drm;
+ struct v4l2_device *v4l2;
+
+ struct buffer *buffers;
+ unsigned int num_buffers;
int current_buffer;
- int buffer_count;
- struct buffer *buffer;
} stream;
static void usage(char *name)
@@ -192,19 +213,19 @@ static int parse_args(int argc, char *argv[], struct setup *s)
return 0;
}
-static int buffer_create(struct buffer *b, int drmfd, struct setup *s,
- uint64_t size, uint32_t pitch)
+static int drm_buffer_create(struct drm_device *dev, struct buffer *b,
+ const struct v4l2_pix_format *fmt)
{
struct drm_mode_create_dumb gem;
struct drm_mode_destroy_dumb gem_destroy;
int ret;
memset(&gem, 0, sizeof gem);
- gem.width = s->w;
- gem.height = s->h;
- gem.bpp = pitch / s->w * 8;
- gem.size = size;
- ret = ioctl(drmfd, DRM_IOCTL_MODE_CREATE_DUMB, &gem);
+ gem.width = fmt->width;
+ gem.height = fmt->height;
+ gem.bpp = fmt->bytesperline / fmt->width * 8;
+ gem.size = fmt->sizeimage;
+ ret = ioctl(dev->fd, DRM_IOCTL_MODE_CREATE_DUMB, &gem);
if (WARN_ON(ret, "CREATE_DUMB failed: %s\n", ERRSTR))
return -1;
b->bo_handle = gem.handle;
@@ -213,19 +234,19 @@ static int buffer_create(struct buffer *b, int drmfd, struct setup *s,
memset(&prime, 0, sizeof prime);
prime.handle = b->bo_handle;
- ret = ioctl(drmfd, DRM_IOCTL_PRIME_HANDLE_TO_FD, &prime);
+ ret = ioctl(dev->fd, DRM_IOCTL_PRIME_HANDLE_TO_FD, &prime);
if (WARN_ON(ret, "PRIME_HANDLE_TO_FD failed: %s\n", ERRSTR))
goto fail_gem;
printf("dbuf_fd = %d\n", prime.fd);
b->dbuf_fd = prime.fd;
uint32_t offsets[4] = { 0 };
- uint32_t pitches[4] = { pitch };
+ uint32_t pitches[4] = { fmt->bytesperline };
uint32_t bo_handles[4] = { b->bo_handle };
- unsigned int fourcc = s->out_fourcc;
+ unsigned int fourcc = dev->format;
if (!fourcc)
- fourcc = s->in_fourcc;
- ret = drmModeAddFB2(drmfd, s->w, s->h, fourcc, bo_handles,
+ fourcc = fmt->pixelformat;
+ ret = drmModeAddFB2(dev->fd, fmt->width, fmt->height, fourcc, bo_handles,
pitches, offsets, &b->fb_handle, 0);
if (WARN_ON(ret, "drmModeAddFB2 failed: %s\n", ERRSTR))
goto fail_prime;
@@ -238,17 +259,16 @@ fail_prime:
fail_gem:
memset(&gem_destroy, 0, sizeof gem_destroy);
gem_destroy.handle = b->bo_handle,
- ret = ioctl(drmfd, DRM_IOCTL_MODE_DESTROY_DUMB, &gem_destroy);
+ ret = ioctl(dev->fd, DRM_IOCTL_MODE_DESTROY_DUMB, &gem_destroy);
WARN_ON(ret, "DESTROY_DUMB failed: %s\n", ERRSTR);
return -1;
}
-static int find_mode(drmModeModeInfo *m, int drmfd, struct setup *s,
- uint32_t *con)
+static int drm_find_mode(struct drm_device *dev, drmModeModeInfo *m)
{
int ret = -1;
- drmModeRes *res = drmModeGetResources(drmfd);
+ drmModeRes *res = drmModeGetResources(dev->fd);
if (WARN_ON(!res, "drmModeGetResources failed: %s\n", ERRSTR))
return -1;
@@ -259,7 +279,7 @@ static int find_mode(drmModeModeInfo *m, int drmfd, struct setup *s,
goto fail_res;
drmModeConnector *c;
- c = drmModeGetConnector(drmfd, s->conId);
+ c = drmModeGetConnector(dev->fd, dev->con_id);
if (WARN_ON(!c, "drmModeGetConnector failed: %s\n", ERRSTR))
goto fail_res;
@@ -268,13 +288,13 @@ static int find_mode(drmModeModeInfo *m, int drmfd, struct setup *s,
drmModeModeInfo *found = NULL;
for (int i = 0; i < c->count_modes; ++i) {
- if (strcmp(c->modes[i].name, s->modestr) == 0) {
+ if (strcmp(c->modes[i].name, dev->modestr) == 0) {
found = &c->modes[i];
break;
}
}
- if (WARN_ON(!found, "mode %s not supported\n", s->modestr)) {
+ 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);
@@ -283,8 +303,6 @@ static int find_mode(drmModeModeInfo *m, int drmfd, struct setup *s,
}
memcpy(m, found, sizeof *found);
- if (con)
- *con = c->connector_id;
ret = 0;
fail_conn:
@@ -296,50 +314,36 @@ fail_res:
return ret;
}
-static void page_flip_handler(int fd __attribute__((__unused__)),
- unsigned int frame __attribute__((__unused__)),
- unsigned int sec __attribute__((__unused__)),
- unsigned int usec __attribute__((__unused__)),
- void *data)
+static void drm_init(struct drm_device *dev, const struct v4l2_pix_format *fmt,
+ unsigned int num_buffers, struct buffer *buffers)
{
- int index = stream.current_buffer;
- struct v4l2_buffer buf;
int ret;
- stream.current_buffer = (unsigned long)data;
- if (index < 0)
- return;
+ dev->fd = drmOpen(dev->module, NULL);
+ BYE_ON(dev->fd < 0, "drmOpen(%s) failed: %s\n", dev->module, ERRSTR);
- memset(&buf, 0, sizeof buf);
- buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
- buf.memory = V4L2_MEMORY_DMABUF;
- buf.index = index;
- buf.m.fd = stream.buffer[index].dbuf_fd;
+ /* TODO: add support for multiplanar formats */
+ for (unsigned int i = 0; i < num_buffers; ++i) {
+ ret = drm_buffer_create(dev, &buffers[i], fmt);
+ BYE_ON(ret, "failed to create buffer%d\n", i);
+ }
+ printf("buffers ready\n");
- ret = ioctl(stream.v4lfd, VIDIOC_QBUF, &buf);
- BYE_ON(ret, "VIDIOC_QBUF(index = %d) failed: %s\n", index, ERRSTR);
+ ret = drm_find_mode(dev, &dev->mode);
+ BYE_ON(ret, "failed to find valid mode\n");
}
-int main(int argc, char *argv[])
+static void v4l2_init(struct v4l2_device *dev, unsigned int num_buffers)
{
int ret;
- struct setup s;
-
- ret = parse_args(argc, argv, &s);
- BYE_ON(ret, "failed to parse arguments\n");
- BYE_ON(s.module[0] == 0, "DRM module is missing\n");
- BYE_ON(s.video[0] == 0, "video node is missing\n");
-
- int drmfd = drmOpen(s.module, NULL);
- BYE_ON(drmfd < 0, "drmOpen(%s) failed: %s\n", s.module, ERRSTR);
- int v4lfd = open(s.video, O_RDWR);
- BYE_ON(v4lfd < 0, "failed to open %s: %s\n", s.video, ERRSTR);
+ dev->fd = open(dev->devname, O_RDWR);
+ BYE_ON(dev->fd < 0, "failed to open %s: %s\n", dev->devname, ERRSTR);
struct v4l2_capability caps;
memset(&caps, 0, sizeof caps);
- ret = ioctl(v4lfd, VIDIOC_QUERYCAP, &caps);
+ ret = ioctl(dev->fd, VIDIOC_QUERYCAP, &caps);
BYE_ON(ret, "VIDIOC_QUERYCAP failed: %s\n", ERRSTR);
/* TODO: add single plane support */
@@ -350,23 +354,18 @@ int main(int argc, char *argv[])
memset(&fmt, 0, sizeof fmt);
fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
- ret = ioctl(v4lfd, VIDIOC_G_FMT, &fmt);
+ ret = ioctl(dev->fd, VIDIOC_G_FMT, &fmt);
BYE_ON(ret < 0, "VIDIOC_G_FMT failed: %s\n", ERRSTR);
printf("G_FMT(start): width = %u, height = %u, 4cc = %.4s\n",
fmt.fmt.pix.width, fmt.fmt.pix.height,
(char*)&fmt.fmt.pix.pixelformat);
- if (s.use_wh) {
- fmt.fmt.pix.width = s.w;
- fmt.fmt.pix.height = s.h;
- }
- if (s.in_fourcc)
- fmt.fmt.pix.pixelformat = s.in_fourcc;
+ fmt.fmt.pix = dev->format;
- ret = ioctl(v4lfd, VIDIOC_S_FMT, &fmt);
+ ret = ioctl(dev->fd, VIDIOC_S_FMT, &fmt);
BYE_ON(ret < 0, "VIDIOC_S_FMT failed: %s\n", ERRSTR);
- ret = ioctl(v4lfd, VIDIOC_G_FMT, &fmt);
+ ret = ioctl(dev->fd, VIDIOC_G_FMT, &fmt);
BYE_ON(ret < 0, "VIDIOC_G_FMT failed: %s\n", ERRSTR);
printf("G_FMT(final): width = %u, height = %u, 4cc = %.4s\n",
fmt.fmt.pix.width, fmt.fmt.pix.height,
@@ -374,41 +373,83 @@ int main(int argc, char *argv[])
struct v4l2_requestbuffers rqbufs;
memset(&rqbufs, 0, sizeof(rqbufs));
- rqbufs.count = s.buffer_count;
+ rqbufs.count = num_buffers;
rqbufs.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
rqbufs.memory = V4L2_MEMORY_DMABUF;
- ret = ioctl(v4lfd, VIDIOC_REQBUFS, &rqbufs);
+ ret = ioctl(dev->fd, VIDIOC_REQBUFS, &rqbufs);
BYE_ON(ret < 0, "VIDIOC_REQBUFS failed: %s\n", ERRSTR);
- BYE_ON(rqbufs.count < s.buffer_count, "video node allocated only "
- "%u of %u buffers\n", rqbufs.count, s.buffer_count);
+ BYE_ON(rqbufs.count < num_buffers, "video node allocated only "
+ "%u of %u buffers\n", rqbufs.count, num_buffers);
- s.in_fourcc = fmt.fmt.pix.pixelformat;
- s.w = fmt.fmt.pix.width;
- s.h = fmt.fmt.pix.height;
+ dev->format = fmt.fmt.pix;
+}
- /* TODO: add support for multiplanar formats */
- struct buffer buffer[s.buffer_count];
- uint64_t size = fmt.fmt.pix.sizeimage;
- uint32_t pitch = fmt.fmt.pix.bytesperline;
- printf("size = %llu pitch = %u\n", size, pitch);
- for (unsigned int i = 0; i < s.buffer_count; ++i) {
- ret = buffer_create(&buffer[i], drmfd, &s, size, pitch);
- BYE_ON(ret, "failed to create buffer%d\n", i);
+static void page_flip_handler(int fd __attribute__((__unused__)),
+ unsigned int frame __attribute__((__unused__)),
+ unsigned int sec __attribute__((__unused__)),
+ unsigned int usec __attribute__((__unused__)),
+ void *data)
+{
+ int index = stream.current_buffer;
+ struct v4l2_buffer buf;
+ int ret;
+
+ stream.current_buffer = (unsigned long)data;
+ if (index < 0)
+ return;
+
+ memset(&buf, 0, sizeof buf);
+ buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
+ buf.memory = V4L2_MEMORY_DMABUF;
+ buf.index = index;
+ buf.m.fd = stream.buffers[index].dbuf_fd;
+
+ ret = ioctl(stream.v4l2->fd, VIDIOC_QBUF, &buf);
+ BYE_ON(ret, "VIDIOC_QBUF(index = %d) failed: %s\n", index, ERRSTR);
+}
+
+int main(int argc, char *argv[])
+{
+ struct v4l2_device v4l2;
+ struct drm_device drm;
+ struct setup s;
+ int ret;
+
+ ret = parse_args(argc, argv, &s);
+ BYE_ON(ret, "failed to parse arguments\n");
+ BYE_ON(s.module[0] == 0, "DRM module is missing\n");
+ BYE_ON(s.video[0] == 0, "video node is missing\n");
+
+ memset(&v4l2, 0, sizeof v4l2);
+ v4l2.devname = s.video;
+
+ if (s.use_wh) {
+ v4l2.format.width = s.w;
+ v4l2.format.height = s.h;
}
- printf("buffers ready\n");
+ if (s.in_fourcc)
+ v4l2.format.pixelformat = s.in_fourcc;
- drmModeModeInfo drmmode;
- uint32_t con;
- ret = find_mode(&drmmode, drmfd, &s, &con);
- BYE_ON(ret, "failed to find valid mode\n");
+ v4l2_init(&v4l2, s.buffer_count);
+
+ struct buffer buffers[s.buffer_count];
+
+ memset(&drm, 0, sizeof drm);
+ drm.module = s.module;
+ drm.modestr = s.modestr;
+ drm.format = s.out_fourcc;
+ drm.crtc_id = s.crtId;
+ drm.con_id = s.conId;
+
+ drm_init(&drm, &v4l2.format, s.buffer_count, buffers);
- ret = drmModeSetCrtc(drmfd, s.crtId, buffer[0].fb_handle, 0, 0,
- &con, 1, &drmmode);
+ 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);
/* enqueueing first buffer to DRM */
- ret = drmModePageFlip(drmfd, s.crtId, buffer[0].fb_handle,
+ ret = drmModePageFlip(drm.fd, drm.crtc_id, buffers[0].fb_handle,
DRM_MODE_PAGE_FLIP_EVENT, 0);
BYE_ON(ret, "drmModePageFlip failed: %s\n", ERRSTR);
@@ -419,25 +460,26 @@ int main(int argc, char *argv[])
buf.index = i;
buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
buf.memory = V4L2_MEMORY_DMABUF;
- buf.m.fd = buffer[i].dbuf_fd;
- ret = ioctl(v4lfd, VIDIOC_QBUF, &buf);
+ buf.m.fd = buffers[i].dbuf_fd;
+ ret = ioctl(v4l2.fd, VIDIOC_QBUF, &buf);
BYE_ON(ret < 0, "VIDIOC_QBUF for buffer %d failed: %s\n",
buf.index, ERRSTR);
}
int type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
- ret = ioctl(v4lfd, VIDIOC_STREAMON, &type);
+ ret = ioctl(v4l2.fd, VIDIOC_STREAMON, &type);
BYE_ON(ret < 0, "STREAMON failed: %s\n", ERRSTR);
struct pollfd fds[] = {
- { .fd = v4lfd, .events = POLLIN },
- { .fd = drmfd, .events = POLLIN },
+ { .fd = v4l2.fd, .events = POLLIN },
+ { .fd = drm.fd, .events = POLLIN },
};
/* buffer currently used by drm */
- stream.v4lfd = v4lfd;
+ stream.v4l2 = &v4l2;
stream.current_buffer = -1;
- stream.buffer = buffer;
+ stream.buffers = buffers;
+ stream.num_buffers = s.buffer_count;
while ((ret = poll(fds, 2, 5000)) > 0) {
if (fds[0].revents & POLLIN) {
@@ -446,10 +488,10 @@ int main(int argc, char *argv[])
/* dequeue buffer */
buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
buf.memory = V4L2_MEMORY_DMABUF;
- ret = ioctl(v4lfd, VIDIOC_DQBUF, &buf);
+ ret = ioctl(v4l2.fd, VIDIOC_DQBUF, &buf);
BYE_ON(ret, "VIDIOC_DQBUF failed: %s\n", ERRSTR);
- ret = drmModePageFlip(drmfd, s.crtId, buffer[buf.index].fb_handle,
+ ret = drmModePageFlip(drm.fd, drm.crtc_id, buffers[buf.index].fb_handle,
DRM_MODE_PAGE_FLIP_EVENT, (void*)(unsigned long)buf.index);
BYE_ON(ret, "drmModePageFlip failed: %s\n", ERRSTR);
@@ -460,7 +502,7 @@ int main(int argc, char *argv[])
evctx.version = DRM_EVENT_CONTEXT_VERSION;
evctx.page_flip_handler = page_flip_handler;
- ret = drmHandleEvent(drmfd, &evctx);
+ ret = drmHandleEvent(drm.fd, &evctx);
BYE_ON(ret, "drmHandleEvent failed: %s\n", ERRSTR);
}
}
generated by cgit v1.2.3 (git 2.25.1) at 2024-12-25 06:11:50 +0000