[PATCH weston v2 5/5] clients: add simple-v4l-dmabuf client
Emmanuel Gil Peyrot
emmanuel.peyrot at collabora.com
Thu Dec 10 11:05:31 PST 2015
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 at collabora.com>
Acked-by: Derek Foreman <derekf at osg.samsung.com>
Maniphest Tasks: T90
Differential Revision: https://phabricator.freedesktop.org/D339
---
.gitignore | 1 +
Makefile.am | 15 +
clients/simple-dmabuf-v4l.c | 945 ++++++++++++++++++++++++++++++++++++++++++++
configure.ac | 14 +
4 files changed, 975 insertions(+)
create mode 100644 clients/simple-dmabuf-v4l.c
diff --git a/.gitignore b/.gitignore
index 719054d..dfbb4d3 100644
--- a/.gitignore
+++ b/.gitignore
@@ -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
diff --git a/Makefile.am b/Makefile.am
index 1eb66ae..623621d 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -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 = \
diff --git a/clients/simple-dmabuf-v4l.c b/clients/simple-dmabuf-v4l.c
new file mode 100644
index 0000000..2334e09
--- /dev/null
+++ b/clients/simple-dmabuf-v4l.c
@@ -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, ¶ms_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,
+ ®istry_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;
+}
diff --git a/configure.ac b/configure.ac
index 24a9de2..97cbfe5 100644
--- a/configure.ac
+++ b/configure.ac
@@ -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
--
2.6.4
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