[PATCH weston v3 5/5] clients: add simple-v4l-dmabuf client
Derek Foreman
derekf at osg.samsung.com
Mon Jan 11 11:20:46 PST 2016
On 11/01/16 01:04 PM, Emmanuel Gil Peyrot wrote:
> 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>
Tested-by: Derek Foreman <derekf at osg.samsung.com>
> Maniphest Tasks: T90
>
> Differential Revision: https://phabricator.freedesktop.org/D339
> ---
> Just rebased against master, no other difference.
>
> .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
>
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