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-rw-r--r--v4l2-drm-example/dmabuf-sharing.c99
1 files changed, 89 insertions, 10 deletions
diff --git a/v4l2-drm-example/dmabuf-sharing.c b/v4l2-drm-example/dmabuf-sharing.c
index 5e1fb6a..e2f1a42 100644
--- a/v4l2-drm-example/dmabuf-sharing.c
+++ b/v4l2-drm-example/dmabuf-sharing.c
@@ -69,6 +69,11 @@ static inline int warn(const char *file, int line, const char *fmt, ...)
#define WARN_ON(cond, ...) \
((cond) ? warn(__FILE__, __LINE__, __VA_ARGS__) : 0)
+enum dmabuf_exporter {
+ DMABUF_EXPORTER_DRM = 0,
+ DMABUF_EXPORTER_V4L2,
+};
+
struct setup {
char module[32];
int conId;
@@ -85,6 +90,7 @@ struct setup {
unsigned int use_compose : 1;
struct v4l2_rect crop;
struct v4l2_rect compose;
+ enum dmabuf_exporter exporter;
};
struct drm_device {
@@ -105,10 +111,12 @@ struct drm_device {
unsigned int height;
struct v4l2_rect compose;
+ int export;
};
struct v4l2_device {
const char *devname;
+ enum v4l2_memory memory;
int fd;
struct v4l2_pix_format format;
@@ -149,6 +157,7 @@ static void usage(char *name)
fprintf(stderr, "\nGeneric options:\n\n");
fprintf(stderr, "\t-b buffer_count\tset number of buffers\n");
+ fprintf(stderr, "\t-e <exporter>\tset the exporter ('v4l2' or 'drm')\n");
fprintf(stderr, "\t-h\tshow this help\n");
}
@@ -170,13 +179,21 @@ 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:p:S:s:t:")) != -1) {
+ while ((c = getopt(argc, argv, "b:e:F:f:hi:M:o:p:S:s:t:")) != -1) {
switch (c) {
case 'b':
ret = sscanf(optarg, "%u", &s->buffer_count);
if (WARN_ON(ret != 1, "incorrect buffer count\n"))
return -1;
break;
+ case 'e':
+ if (strcmp(optarg, "v4l2") == 0)
+ s->exporter = DMABUF_EXPORTER_V4L2;
+ else if (strcmp(optarg, "drm") == 0)
+ s->exporter = DMABUF_EXPORTER_DRM;
+ else if (WARN_ON(1, ""))
+ return -1;
+ break;
case 'F':
if (WARN_ON(strlen(optarg) != 4, "invalid fourcc\n"))
return -1;
@@ -284,13 +301,49 @@ fail_prime:
fail_gem:
memset(&gem_destroy, 0, sizeof gem_destroy);
- gem_destroy.handle = b->bo_handle,
+ gem_destroy.handle = b->bo_handle;
ret = ioctl(dev->fd, DRM_IOCTL_MODE_DESTROY_DUMB, &gem_destroy);
WARN_ON(ret, "DESTROY_DUMB failed: %s\n", ERRSTR);
return -1;
}
+static int drm_buffer_import(struct drm_device *dev, struct buffer *b,
+ const struct v4l2_pix_format *fmt)
+{
+ struct drm_prime_handle prime;
+ struct drm_gem_close gem_close;
+ int ret;
+
+ memset(&prime, 0, sizeof prime);
+ prime.fd = b->dbuf_fd;
+ ret = ioctl(dev->fd, DRM_IOCTL_PRIME_FD_TO_HANDLE, &prime);
+ if (WARN_ON(ret, "PRIME_FD_TO_HANDLE failed: %s\n", ERRSTR))
+ return -1;
+ b->bo_handle = prime.handle;
+
+ uint32_t offsets[4] = { 0 };
+ uint32_t pitches[4] = { fmt->bytesperline };
+ uint32_t bo_handles[4] = { b->bo_handle };
+ unsigned int fourcc = dev->format;
+ if (!fourcc)
+ 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_gem;
+
+ return 0;
+
+fail_gem:
+ memset(&gem_close, 0, sizeof gem_close);
+ gem_close.handle = b->bo_handle;
+ ret = ioctl(dev->fd, DRM_IOCTL_GEM_CLOSE, &gem_close);
+ WARN_ON(ret, "GEM_CLOSE failed: %s\n", ERRSTR);
+
+ return -1;
+}
+
static int drm_find_crtc(struct drm_device *dev)
{
int ret = -1;
@@ -406,8 +459,13 @@ static void drm_init(struct drm_device *dev, const struct v4l2_pix_format *fmt,
/* 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);
+ if (dev->export) {
+ ret = drm_buffer_create(dev, &buffers[i], fmt);
+ BYE_ON(ret, "failed to create buffer%d\n", i);
+ } else {
+ ret = drm_buffer_import(dev, &buffers[i], fmt);
+ BYE_ON(ret, "failed to import buffer%d\n", i);
+ }
}
printf("buffers ready\n");
@@ -452,7 +510,8 @@ static void drm_page_flip(struct drm_device *dev, struct buffer *buffer)
}
}
-static void v4l2_init(struct v4l2_device *dev, unsigned int num_buffers)
+static void v4l2_init(struct v4l2_device *dev, unsigned int num_buffers,
+ struct buffer *buffers)
{
int ret;
@@ -494,7 +553,7 @@ static void v4l2_init(struct v4l2_device *dev, unsigned int num_buffers)
memset(&rqbufs, 0, sizeof(rqbufs));
rqbufs.count = num_buffers;
rqbufs.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
- rqbufs.memory = V4L2_MEMORY_DMABUF;
+ rqbufs.memory = dev->memory;
ret = ioctl(dev->fd, VIDIOC_REQBUFS, &rqbufs);
BYE_ON(ret < 0, "VIDIOC_REQBUFS failed: %s\n", ERRSTR);
@@ -502,6 +561,22 @@ static void v4l2_init(struct v4l2_device *dev, unsigned int num_buffers)
"%u of %u buffers\n", rqbufs.count, num_buffers);
dev->format = fmt.fmt.pix;
+
+ if (dev->memory == V4L2_MEMORY_DMABUF)
+ return;
+
+ for (unsigned int i = 0; i < num_buffers; ++i) {
+ struct v4l2_exportbuffer expbuf;
+ memset(&expbuf, 0, sizeof(expbuf));
+ expbuf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
+ expbuf.index = i;
+
+ ret = ioctl(dev->fd, VIDIOC_EXPBUF, &expbuf);
+ BYE_ON(ret < 0, "VIDIOC_EXPBUF failed: %s\n", ERRSTR);
+ buffers[i].dbuf_fd = expbuf.fd;
+
+ printf("dbuf_fd = %d\n", expbuf.fd);
+ }
}
static void v4l2_queue_buffer(struct v4l2_device *dev, const struct buffer *buffer)
@@ -511,9 +586,10 @@ static void v4l2_queue_buffer(struct v4l2_device *dev, const struct buffer *buff
memset(&buf, 0, sizeof buf);
buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
- buf.memory = V4L2_MEMORY_DMABUF;
+ buf.memory = dev->memory;
buf.index = buffer->index;
- buf.m.fd = buffer->dbuf_fd;
+ if (dev->memory == V4L2_MEMORY_DMABUF)
+ buf.m.fd = buffer->dbuf_fd;
ret = ioctl(dev->fd, VIDIOC_QBUF, &buf);
BYE_ON(ret, "VIDIOC_QBUF(index = %d) failed: %s\n", buffer->index, ERRSTR);
@@ -562,6 +638,8 @@ int main(int argc, char *argv[])
memset(&v4l2, 0, sizeof v4l2);
v4l2.devname = s.video;
+ v4l2.memory = s.exporter == DMABUF_EXPORTER_V4L2
+ ? V4L2_MEMORY_MMAP : V4L2_MEMORY_DMABUF;
if (s.use_wh) {
v4l2.format.width = s.w;
@@ -570,13 +648,13 @@ int main(int argc, char *argv[])
if (s.in_fourcc)
v4l2.format.pixelformat = s.in_fourcc;
- v4l2_init(&v4l2, s.buffer_count);
-
struct buffer buffers[s.buffer_count];
for (unsigned int i = 0; i < s.buffer_count; ++i)
buffers[i].index = i;
+ v4l2_init(&v4l2, s.buffer_count, buffers);
+
memset(&drm, 0, sizeof drm);
drm.module = s.module;
drm.modestr = s.modestr;
@@ -585,6 +663,7 @@ int main(int argc, char *argv[])
drm.height = v4l2.format.height;
drm.crtc_id = s.crtId;
drm.con_id = s.conId;
+ drm.export = s.exporter == DMABUF_EXPORTER_DRM;
drm_init(&drm, &v4l2.format, s.buffer_count, buffers);
generated by cgit v1.2.3 (git 2.25.1) at 2024-12-25 05:31:52 +0000