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clients: add simple-v4l-dmabuf client

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This client opens a V4L2 device, usually exposed as /dev/videoN, and
retrieves its frames as dmabuf for later import into the compositor.

It supports both single- and multi-planar devices, and any format
exposed by the V4L2 device the Wayland compositor accepts.

This client never changes the v4l2 settings, use `v4l2-ctl -c` if you
want to change those.

Signed-off-by: Emmanuel Gil Peyrot <emmanuel.peyrot@collabora.com>
Acked-by: Derek Foreman <derekf@osg.samsung.com>
Tested-by: Derek Foreman <derekf@osg.samsung.com>

Maniphest Tasks: T90

Differential Revision: https://phabricator.freedesktop.org/D339
This commit is contained in:
Emmanuel Gil Peyrot 2016-01-11 19:04:38 +00:00 committed by Derek Foreman
parent 8ef2957873
commit 5d43af3e88
4 changed files with 975 additions and 0 deletions
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1
.gitignore vendored
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@ -67,6 +67,7 @@ weston-presentation-shm
weston-resizor
weston-scaler
weston-simple-dmabuf-intel
weston-simple-dmabuf-v4l
weston-simple-egl
weston-simple-shm
weston-simple-touch

15
Makefile.am
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@ -538,6 +538,21 @@ weston_simple_dmabuf_intel_LDADD = $(SIMPLE_DMABUF_INTEL_CLIENT_LIBS) libshared.
BUILT_SOURCES += protocol/linux-dmabuf-unstable-v1-client-protocol.h
endif
if BUILD_SIMPLE_DMABUF_V4L_CLIENT
demo_clients += weston-simple-dmabuf-v4l
weston_simple_dmabuf_v4l_SOURCES = clients/simple-dmabuf-v4l.c
nodist_weston_simple_dmabuf_v4l_SOURCES = \
protocol/xdg-shell-unstable-v5-protocol.c \
protocol/xdg-shell-unstable-v5-client-protocol.h \
protocol/fullscreen-shell-unstable-v1-protocol.c \
protocol/fullscreen-shell-unstable-v1-client-protocol.h \
protocol/linux-dmabuf-unstable-v1-protocol.c \
protocol/linux-dmabuf-unstable-v1-client-protocol.h
weston_simple_dmabuf_v4l_CFLAGS = $(AM_CFLAGS) $(SIMPLE_DMABUF_V4L_CLIENT_CFLAGS)
weston_simple_dmabuf_v4l_LDADD = $(SIMPLE_DMABUF_V4L_CLIENT_LIBS) libshared.la
BUILT_SOURCES += protocol/linux-dmabuf-unstable-v1-client-protocol.h
endif
noinst_LTLIBRARIES += libtoytoolkit.la
libtoytoolkit_la_SOURCES = \

945
clients/simple-dmabuf-v4l.c Normal file
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@ -0,0 +1,945 @@
/*
* Copyright © 2015 Collabora Ltd.
*
* Permission to use, copy, modify, distribute, and sell this software and its
* documentation for any purpose is hereby granted without fee, provided that
* the above copyright notice appear in all copies and that both that copyright
* notice and this permission notice appear in supporting documentation, and
* that the name of the copyright holders not be used in advertising or
* publicity pertaining to distribution of the software without specific,
* written prior permission. The copyright holders make no representations
* about the suitability of this software for any purpose. It is provided "as
* is" without express or implied warranty.
*
* THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
* EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
* CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
* DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
* TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
* OF THIS SOFTWARE.
*/
#include <config.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdbool.h>
#include <assert.h>
#include <unistd.h>
#include <sys/mman.h>
#include <signal.h>
#include <fcntl.h>
#include <drm_fourcc.h>
#include <stropts.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <errno.h>
#include <linux/videodev2.h>
#include <linux/input.h>
#include <wayland-client.h>
#include "xdg-shell-unstable-v5-client-protocol.h"
#include "fullscreen-shell-unstable-v1-client-protocol.h"
#include "linux-dmabuf-unstable-v1-client-protocol.h"
#define CLEAR(x) memset(&(x), 0, sizeof(x))
static int
xioctl(int fh, int request, void *arg)
{
int r;
do {
r = ioctl(fh, request, arg);
} while (r == -1 && errno == EINTR);
return r;
}
static uint32_t
parse_format(const char fmt[4])
{
return fourcc_code(fmt[0], fmt[1], fmt[2], fmt[3]);
}
static inline const char *
dump_format(uint32_t format, char out[4])
{
#if BYTE_ORDER == BIG_ENDIAN
format = __builtin_bswap32(format);
#endif
memcpy(out, &format, 4);
return out;
}
struct buffer_format {
int width;
int height;
enum v4l2_buf_type type;
uint32_t format;
unsigned num_planes;
unsigned strides[VIDEO_MAX_PLANES];
};
struct display {
struct wl_display *display;
struct wl_registry *registry;
struct wl_compositor *compositor;
struct wl_seat *seat;
struct wl_keyboard *keyboard;
struct xdg_shell *shell;
struct zwp_fullscreen_shell_v1 *fshell;
struct zwp_linux_dmabuf_v1 *dmabuf;
bool requested_format_found;
int v4l_fd;
struct buffer_format format;
uint32_t drm_format;
};
struct buffer {
struct wl_buffer *buffer;
struct display *display;
int busy;
int index;
int dmabuf_fds[VIDEO_MAX_PLANES];
int data_offsets[VIDEO_MAX_PLANES];
};
#define NUM_BUFFERS 3
struct window {
struct display *display;
struct wl_surface *surface;
struct xdg_surface *xdg_surface;
struct buffer buffers[NUM_BUFFERS];
struct wl_callback *callback;
};
static bool running = true;
static int
queue(struct display *display, struct buffer *buffer)
{
struct v4l2_buffer buf;
struct v4l2_plane planes[VIDEO_MAX_PLANES];
unsigned i;
CLEAR(buf);
buf.type = display->format.type;
buf.memory = V4L2_MEMORY_MMAP;
buf.index = buffer->index;
if (display->format.type == V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE) {
CLEAR(planes);
buf.length = VIDEO_MAX_PLANES;
buf.m.planes = planes;
}
if (xioctl(display->v4l_fd, VIDIOC_QUERYBUF, &buf) == -1) {
perror("VIDIOC_QUERYBUF");
return 0;
}
if (xioctl(display->v4l_fd, VIDIOC_QBUF, &buf) == -1) {
perror("VIDIOC_QBUF");
return 0;
}
if (display->format.type == V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE) {
if (display->format.num_planes != buf.length) {
fprintf(stderr, "Wrong number of planes returned by "
"QUERYBUF\n");
return 0;
}
for (i = 0; i < buf.length; ++i)
buffer->data_offsets[i] = buf.m.planes[i].data_offset;
}
return 1;
}
static void
buffer_release(void *data, struct wl_buffer *buffer)
{
struct buffer *mybuf = data;
mybuf->busy = 0;
if (!queue(mybuf->display, mybuf))
running = false;
}
static const struct wl_buffer_listener buffer_listener = {
buffer_release
};
static unsigned int
set_format(struct display *display, uint32_t format)
{
struct v4l2_format fmt;
char buf[4];
CLEAR(fmt);
fmt.type = display->format.type;
if (xioctl(display->v4l_fd, VIDIOC_G_FMT, &fmt) == -1) {
perror("VIDIOC_G_FMT");
return 0;
}
/* No need to set the format if it already is the one we want */
if (display->format.type == V4L2_BUF_TYPE_VIDEO_CAPTURE &&
fmt.fmt.pix.pixelformat == format)
return 1;
if (display->format.type == V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE &&
fmt.fmt.pix_mp.pixelformat == format)
return fmt.fmt.pix_mp.num_planes;
if (display->format.type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
fmt.fmt.pix.pixelformat = format;
else
fmt.fmt.pix_mp.pixelformat = format;
if (xioctl(display->v4l_fd, VIDIOC_S_FMT, &fmt) == -1) {
perror("VIDIOC_S_FMT");
return 0;
}
if ((display->format.type == V4L2_BUF_TYPE_VIDEO_CAPTURE &&
fmt.fmt.pix.pixelformat != format) ||
(display->format.type == V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE &&
fmt.fmt.pix_mp.pixelformat != format)) {
fprintf(stderr, "Failed to set format to %.4s\n",
dump_format(format, buf));
return 0;
}
if (display->format.type == V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE)
return fmt.fmt.pix_mp.num_planes;
return 1;
}
static int
v4l_connect(struct display *display, const char *dev_name)
{
struct v4l2_capability cap;
struct v4l2_requestbuffers req;
unsigned int num_planes;
display->v4l_fd = open(dev_name, O_RDWR);
if (display->v4l_fd < 0) {
perror(dev_name);
return 0;
}
if (xioctl(display->v4l_fd, VIDIOC_QUERYCAP, &cap) == -1) {
if (errno == EINVAL) {
fprintf(stderr, "%s is no V4L2 device\n", dev_name);
} else {
perror("VIDIOC_QUERYCAP");
}
return 0;
}
if (cap.capabilities & V4L2_CAP_VIDEO_CAPTURE)
display->format.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
else if (cap.capabilities & V4L2_CAP_VIDEO_CAPTURE_MPLANE)
display->format.type = V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE;
else {
fprintf(stderr, "%s is no video capture device\n", dev_name);
return 0;
}
if (!(cap.capabilities & V4L2_CAP_STREAMING)) {
fprintf(stderr, "%s does not support dmabuf i/o\n", dev_name);
return 0;
}
/* Select video input, video standard and tune here */
num_planes = set_format(display, display->format.format);
if (num_planes < 1)
return 0;
CLEAR(req);
req.type = display->format.type;
req.memory = V4L2_MEMORY_MMAP;
req.count = NUM_BUFFERS * num_planes;
if (xioctl(display->v4l_fd, VIDIOC_REQBUFS, &req) == -1) {
if (errno == EINVAL) {
fprintf(stderr, "%s does not support dmabuf\n",
dev_name);
} else {
perror("VIDIOC_REQBUFS");
}
return 0;
}
if (req.count < NUM_BUFFERS * num_planes) {
fprintf(stderr, "Insufficient buffer memory on %s\n", dev_name);
return 0;
}
printf("Created %d buffers\n", req.count);
return 1;
}
static void
v4l_shutdown(struct display *display)
{
close(display->v4l_fd);
}
static void
create_succeeded(void *data,
struct zwp_linux_buffer_params_v1 *params,
struct wl_buffer *new_buffer)
{
struct buffer *buffer = data;
unsigned i;
buffer->buffer = new_buffer;
wl_buffer_add_listener(buffer->buffer, &buffer_listener, buffer);
zwp_linux_buffer_params_v1_destroy(params);
for (i = 0; i < buffer->display->format.num_planes; ++i)
close(buffer->dmabuf_fds[i]);
}
static void
create_failed(void *data, struct zwp_linux_buffer_params_v1 *params)
{
struct buffer *buffer = data;
unsigned i;
buffer->buffer = NULL;
zwp_linux_buffer_params_v1_destroy(params);
for (i = 0; i < buffer->display->format.num_planes; ++i)
close(buffer->dmabuf_fds[i]);
running = false;
fprintf(stderr, "Error: zwp_linux_buffer_params.create failed.\n");
}
static const struct zwp_linux_buffer_params_v1_listener params_listener = {
create_succeeded,
create_failed
};
static void
create_dmabuf_buffer(struct display *display, struct buffer *buffer)
{
struct zwp_linux_buffer_params_v1 *params;
uint64_t modifier;
uint32_t flags;
unsigned i;
modifier = 0;
flags = ZWP_LINUX_BUFFER_PARAMS_V1_FLAGS_Y_INVERT;
params = zwp_linux_dmabuf_v1_create_params(display->dmabuf);
for (i = 0; i < display->format.num_planes; ++i)
zwp_linux_buffer_params_v1_add(params,
buffer->dmabuf_fds[i],
i, /* plane_idx */
buffer->data_offsets[i], /* offset */
display->format.strides[i],
modifier >> 32,
modifier & 0xffffffff);
zwp_linux_buffer_params_v1_add_listener(params, &params_listener,
buffer);
zwp_linux_buffer_params_v1_create(params,
display->format.width,
display->format.height,
display->drm_format,
flags);
}
static int
buffer_export(struct display *display, int index, int dmafd[])
{
struct v4l2_exportbuffer expbuf;
unsigned i;
CLEAR(expbuf);
for (i = 0; i < display->format.num_planes; ++i) {
expbuf.type = display->format.type;
expbuf.index = index;
expbuf.plane = i;
if (xioctl(display->v4l_fd, VIDIOC_EXPBUF, &expbuf) == -1) {
perror("VIDIOC_EXPBUF");
while (i)
close(dmafd[--i]);
return 0;
}
dmafd[i] = expbuf.fd;
}
return 1;
}
static int
queue_initial_buffers(struct display *display,
struct buffer buffers[NUM_BUFFERS])
{
struct buffer *buffer;
int index;
for (index = 0; index < NUM_BUFFERS; ++index) {
buffer = &buffers[index];
buffer->display = display;
buffer->index = index;
if (!queue(display, buffer)) {
fprintf(stderr, "Failed to queue buffer\n");
return 0;
}
assert(!buffer->buffer);
if (!buffer_export(display, index, buffer->dmabuf_fds))
return 0;
create_dmabuf_buffer(display, buffer);
}
return 1;
}
static int
dequeue(struct display *display)
{
struct v4l2_buffer buf;
struct v4l2_plane planes[VIDEO_MAX_PLANES];
CLEAR(buf);
buf.type = display->format.type;
buf.memory = V4L2_MEMORY_MMAP;
buf.length = VIDEO_MAX_PLANES;
buf.m.planes = planes;
/* This ioctl is blocking until a buffer is ready to be displayed */
if (xioctl(display->v4l_fd, VIDIOC_DQBUF, &buf) == -1) {
perror("VIDIOC_DQBUF");
return -1;
}
assert(buf.flags & V4L2_BUF_FLAG_DONE);
return buf.index;
}
static int
fill_buffer_format(struct display *display)
{
struct v4l2_format fmt;
struct v4l2_pix_format *pix;
struct v4l2_pix_format_mplane *pix_mp;
int i;
char buf[4];
CLEAR(fmt);
fmt.type = display->format.type;
/* Preserve original settings as set by v4l2-ctl for example */
if (xioctl(display->v4l_fd, VIDIOC_G_FMT, &fmt) == -1) {
perror("VIDIOC_G_FMT");
return 0;
}
if (display->format.type == V4L2_BUF_TYPE_VIDEO_CAPTURE) {
pix = &fmt.fmt.pix;
printf("%d×%d, %.4s\n", pix->width, pix->height,
dump_format(pix->pixelformat, buf));
display->format.num_planes = 1;
display->format.width = pix->width;
display->format.height = pix->height;
display->format.strides[0] = pix->bytesperline;
} else {
pix_mp = &fmt.fmt.pix_mp;
display->format.num_planes = pix_mp->num_planes;
display->format.width = pix_mp->width;
display->format.height = pix_mp->height;
for (i = 0; i < pix_mp->num_planes; ++i)
display->format.strides[i] = pix_mp->plane_fmt[i].bytesperline;
printf("%d×%d, %.4s, %d planes\n",
pix_mp->width, pix_mp->height,
dump_format(pix_mp->pixelformat, buf),
pix_mp->num_planes);
}
return 1;
}
static int
v4l_init(struct display *display, struct buffer buffers[NUM_BUFFERS]) {
if (!fill_buffer_format(display)) {
fprintf(stderr, "Failed to fill buffer format\n");
return 0;
}
if (!queue_initial_buffers(display, buffers)) {
fprintf(stderr, "Failed to queue initial buffers\n");
return 0;
}
return 1;
}
static int
start_capture(struct display *display)
{
int type = display->format.type;
if (xioctl(display->v4l_fd, VIDIOC_STREAMON, &type) == -1) {
perror("VIDIOC_STREAMON");
return 0;
}
return 1;
}
static void
handle_configure(void *data, struct xdg_surface *surface,
int32_t width, int32_t height,
struct wl_array *states, uint32_t serial)
{
}
static void
handle_delete(void *data, struct xdg_surface *xdg_surface)
{
running = false;
}
static const struct xdg_surface_listener xdg_surface_listener = {
handle_configure,
handle_delete,
};
static struct window *
create_window(struct display *display)
{
struct window *window;
window = calloc(1, sizeof *window);
if (!window)
return NULL;
window->callback = NULL;
window->display = display;
window->surface = wl_compositor_create_surface(display->compositor);
if (display->shell) {
window->xdg_surface =
xdg_shell_get_xdg_surface(display->shell,
window->surface);
assert(window->xdg_surface);
xdg_surface_add_listener(window->xdg_surface,
&xdg_surface_listener, window);
xdg_surface_set_title(window->xdg_surface, "simple-dmabuf-v4l");
} else if (display->fshell) {
zwp_fullscreen_shell_v1_present_surface(display->fshell,
window->surface,
ZWP_FULLSCREEN_SHELL_V1_PRESENT_METHOD_DEFAULT,
NULL);
} else {
assert(0);
}
return window;
}
static void
destroy_window(struct window *window)
{
int i;
unsigned j;
if (window->callback)
wl_callback_destroy(window->callback);
if (window->xdg_surface)
xdg_surface_destroy(window->xdg_surface);
wl_surface_destroy(window->surface);
for (i = 0; i < NUM_BUFFERS; i++) {
if (!window->buffers[i].buffer)
continue;
wl_buffer_destroy(window->buffers[i].buffer);
for (j = 0; j < window->display->format.num_planes; ++j)
close(window->buffers[i].dmabuf_fds[j]);
}
v4l_shutdown(window->display);
free(window);
}
static const struct wl_callback_listener frame_listener;
static void
redraw(void *data, struct wl_callback *callback, uint32_t time)
{
struct window *window = data;
struct buffer *buffer;
int index, num_busy = 0;
/* Check for a deadlock situation where we would block forever trying
* to dequeue a buffer while all of them are locked by the compositor.
*/
for (index = 0; index < NUM_BUFFERS; ++index)
if (window->buffers[index].busy)
++num_busy;
/* A robust application would just postpone redraw until it has queued
* a buffer.
*/
assert(num_busy < NUM_BUFFERS);
index = dequeue(window->display);
if (index < 0) {
/* We couldn’t get any buffer out of the camera, exiting. */
running = false;
return;
}
buffer = &window->buffers[index];
assert(!buffer->busy);
wl_surface_attach(window->surface, buffer->buffer, 0, 0);
wl_surface_damage(window->surface, 0, 0,
window->display->format.width,
window->display->format.height);
if (callback)
wl_callback_destroy(callback);
window->callback = wl_surface_frame(window->surface);
wl_callback_add_listener(window->callback, &frame_listener, window);
wl_surface_commit(window->surface);
buffer->busy = 1;
}
static const struct wl_callback_listener frame_listener = {
redraw
};
static void
dmabuf_format(void *data, struct zwp_linux_dmabuf_v1 *zwp_linux_dmabuf,
uint32_t format)
{
struct display *d = data;
if (format == d->drm_format)
d->requested_format_found = true;
}
static const struct zwp_linux_dmabuf_v1_listener dmabuf_listener = {
dmabuf_format
};
static void
keyboard_handle_keymap(void *data, struct wl_keyboard *keyboard,
uint32_t format, int fd, uint32_t size)
{
/* Just so we don’t leak the keymap fd */
close(fd);
}
static void
keyboard_handle_enter(void *data, struct wl_keyboard *keyboard,
uint32_t serial, struct wl_surface *surface,
struct wl_array *keys)
{
}
static void
keyboard_handle_leave(void *data, struct wl_keyboard *keyboard,
uint32_t serial, struct wl_surface *surface)
{
}
static void
keyboard_handle_key(void *data, struct wl_keyboard *keyboard,
uint32_t serial, uint32_t time, uint32_t key,
uint32_t state)
{
struct display *d = data;
if (!d->shell)
return;
if (key == KEY_ESC && state)
running = false;
}
static void
keyboard_handle_modifiers(void *data, struct wl_keyboard *keyboard,
uint32_t serial, uint32_t mods_depressed,
uint32_t mods_latched, uint32_t mods_locked,
uint32_t group)
{
}
static const struct wl_keyboard_listener keyboard_listener = {
keyboard_handle_keymap,
keyboard_handle_enter,
keyboard_handle_leave,
keyboard_handle_key,
keyboard_handle_modifiers,
};
static void
seat_handle_capabilities(void *data, struct wl_seat *seat,
enum wl_seat_capability caps)
{
struct display *d = data;
if ((caps & WL_SEAT_CAPABILITY_KEYBOARD) && !d->keyboard) {
d->keyboard = wl_seat_get_keyboard(seat);
wl_keyboard_add_listener(d->keyboard, &keyboard_listener, d);
} else if (!(caps & WL_SEAT_CAPABILITY_KEYBOARD) && d->keyboard) {
wl_keyboard_destroy(d->keyboard);
d->keyboard = NULL;
}
}
static const struct wl_seat_listener seat_listener = {
seat_handle_capabilities,
};
static void
xdg_shell_ping(void *data, struct xdg_shell *shell, uint32_t serial)
{
xdg_shell_pong(shell, serial);
}
static const struct xdg_shell_listener xdg_shell_listener = {
xdg_shell_ping,
};
#define XDG_VERSION 5 /* The version of xdg-shell that we implement */
#ifdef static_assert
static_assert(XDG_VERSION == XDG_SHELL_VERSION_CURRENT,
"Interface version doesn't match implementation version");
#endif
static void
registry_handle_global(void *data, struct wl_registry *registry,
uint32_t id, const char *interface, uint32_t version)
{
struct display *d = data;
if (strcmp(interface, "wl_compositor") == 0) {
d->compositor =
wl_registry_bind(registry,
id, &wl_compositor_interface, 1);
} else if (strcmp(interface, "wl_seat") == 0) {
d->seat = wl_registry_bind(registry,
id, &wl_seat_interface, 1);
wl_seat_add_listener(d->seat, &seat_listener, d);
} else if (strcmp(interface, "xdg_shell") == 0) {
d->shell = wl_registry_bind(registry,
id, &xdg_shell_interface, 1);
xdg_shell_use_unstable_version(d->shell, XDG_VERSION);
xdg_shell_add_listener(d->shell, &xdg_shell_listener, d);
} else if (strcmp(interface, "zwp_fullscreen_shell_v1") == 0) {
d->fshell = wl_registry_bind(registry,
id, &zwp_fullscreen_shell_v1_interface,
1);
} else if (strcmp(interface, "zwp_linux_dmabuf_v1") == 0) {
d->dmabuf = wl_registry_bind(registry,
id, &zwp_linux_dmabuf_v1_interface,
1);
zwp_linux_dmabuf_v1_add_listener(d->dmabuf, &dmabuf_listener,
d);
}
}
static void
registry_handle_global_remove(void *data, struct wl_registry *registry,
uint32_t name)
{
}
static const struct wl_registry_listener registry_listener = {
registry_handle_global,
registry_handle_global_remove
};
static struct display *
create_display(uint32_t requested_format)
{
struct display *display;
display = malloc(sizeof *display);
if (display == NULL) {
fprintf(stderr, "out of memory\n");
exit(1);
}
display->display = wl_display_connect(NULL);
assert(display->display);
display->drm_format = requested_format;
display->registry = wl_display_get_registry(display->display);
wl_registry_add_listener(display->registry,
&registry_listener, display);
wl_display_roundtrip(display->display);
if (display->dmabuf == NULL) {
fprintf(stderr, "No zwp_linux_dmabuf global\n");
exit(1);
}
wl_display_roundtrip(display->display);
/* XXX: fake, because the compositor does not yet advertise anything */
display->requested_format_found = true;
if (!display->requested_format_found) {
fprintf(stderr, "DRM_FORMAT_YUYV not available\n");
exit(1);
}
return display;
}
static void
destroy_display(struct display *display)
{
if (display->dmabuf)
zwp_linux_dmabuf_v1_destroy(display->dmabuf);
if (display->shell)
xdg_shell_destroy(display->shell);
if (display->fshell)
zwp_fullscreen_shell_v1_release(display->fshell);
if (display->compositor)
wl_compositor_destroy(display->compositor);
wl_registry_destroy(display->registry);
wl_display_flush(display->display);
wl_display_disconnect(display->display);
free(display);
}
static void
usage(const char *argv0)
{
printf("Usage: %s [V4L2 device] [V4L2 format] [DRM format]\n"
"\n"
"The default V4L2 device is /dev/video0\n"
"\n"
"Both formats are FOURCC values (see http://fourcc.org/)\n"
"V4L2 formats are defined in <linux/videodev2.h>\n"
"DRM formats are defined in <libdrm/drm_fourcc.h>\n"
"The default for both formats is YUYV.\n"
"If the V4L2 and DRM formats differ, the data is simply "
"reinterpreted rather than converted.\n", argv0);
exit(0);
}
static void
signal_int(int signum)
{
running = false;
}
int
main(int argc, char **argv)
{
struct sigaction sigint;
struct display *display;
struct window *window;
const char *v4l_device;
uint32_t v4l_format, drm_format;
int ret = 0;
if (argc < 2) {
v4l_device = "/dev/video0";
} else if (!strcmp(argv[1], "--help")) {
usage(argv[0]);
} else {
v4l_device = argv[1];
}
if (argc < 3)
v4l_format = parse_format("YUYV");
else
v4l_format = parse_format(argv[2]);
if (argc < 4)
drm_format = v4l_format;
else
drm_format = parse_format(argv[3]);
display = create_display(drm_format);
display->format.format = v4l_format;
window = create_window(display);
if (!window)
return 1;
if (!v4l_connect(display, v4l_device))
return 1;
if (!v4l_init(display, window->buffers))
return 1;
sigint.sa_handler = signal_int;
sigemptyset(&sigint.sa_mask);
sigint.sa_flags = SA_RESETHAND;
sigaction(SIGINT, &sigint, NULL);
/* Here we retrieve the linux-dmabuf objects, or error */
wl_display_roundtrip(display->display);
/* In case of error, running will be 0 */
if (!running)
return 1;
/* We got all of our buffers, we can start the capture! */
if (!start_capture(display))
return 1;
redraw(window, NULL, 0);
while (running && ret != -1)
ret = wl_display_dispatch(display->display);
fprintf(stderr, "simple-dmabuf-v4l exiting\n");
destroy_window(window);
destroy_display(display);
return 0;
}

14
configure.ac
View file

@ -356,6 +356,20 @@ if ! test "x$enable_simple_dmabuf_intel_client" = "xno"; then
fi
AM_CONDITIONAL(BUILD_SIMPLE_DMABUF_INTEL_CLIENT, test "x$enable_simple_dmabuf_intel_client" = "xyes")
AC_ARG_ENABLE(simple-dmabuf-v4l-client,
AS_HELP_STRING([--disable-simple-dmabuf-v4l-client],
[do not build the simple dmabuf v4l client]),,
enable_simple_dmabuf_v4l_client="auto")
if ! test "x$enable_simple_dmabuf_v4l_client" = "xno"; then
PKG_CHECK_MODULES(SIMPLE_DMABUF_V4L_CLIENT, [wayland-client libdrm],
have_simple_dmabuf_v4l_client=yes, have_simple_dmabuf_v4l_client=no)
if test "x$have_simple_dmabuf_v4l_client" = "xno" -a "x$enable_simple_dmabuf_v4l_client" = "xyes"; then
AC_MSG_ERROR([V4L dmabuf client explicitly enabled, but libdrm couldn't be found])
fi
enable_simple_dmabuf_v4l_client="$have_simple_dmabuf_v4l_client"
fi
AM_CONDITIONAL(BUILD_SIMPLE_DMABUF_V4L_CLIENT, test "x$enable_simple_dmabuf_v4l_client" = "xyes")
AC_ARG_ENABLE(clients, [ --enable-clients],, enable_clients=yes)
AM_CONDITIONAL(BUILD_CLIENTS, test x$enable_clients = xyes)
if test x$enable_clients = xyes; then