[PATCH weston v3 5/5] clients: add simple-v4l-dmabuf client
Derek Foreman
derekf at osg.samsung.com
Mon Jan 11 11:40:25 PST 2016
On 11/01/16 01:20 PM, Derek Foreman wrote:
> 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>
And I've just landed the series.
Thanks,
Derek
>> 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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