weston/pipewire/pipewire-plugin.c

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/*
* Copyright © 2019 Pengutronix, Michael Olbrich <m.olbrich@pengutronix.de>
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice (including the
* next paragraph) shall be included in all copies or substantial
* portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#include "config.h"
#include <libweston/pipewire-plugin.h>
#include "backend.h"
#include "libweston-internal.h"
#include "shared/timespec-util.h"
#include "shared/string-helpers.h"
#include <libweston/backend-drm.h>
#include <libweston/weston-log.h>
#include <sys/mman.h>
#include <errno.h>
#include <unistd.h>
#include <pipewire/pipewire.h>
#include <spa/param/format-utils.h>
#include <spa/param/video/format-utils.h>
#include <spa/utils/defs.h>
#include <spa/buffer/meta.h>
#include <spa/utils/result.h>
#define PROP_RANGE(min, max) 2, (min), (max)
struct weston_pipewire {
struct weston_compositor *compositor;
struct wl_list output_list;
struct wl_listener destroy_listener;
const struct weston_drm_virtual_output_api *virtual_output_api;
struct weston_log_scope *debug;
struct pw_loop *loop;
struct wl_event_source *loop_source;
struct pw_context *context;
struct pw_core *core;
struct pw_type *t;
struct spa_hook core_listener;
};
struct pipewire_output {
struct weston_output *output;
int (*saved_enable)(struct weston_output *output);
int (*saved_disable)(struct weston_output *output);
int (*saved_start_repaint_loop)(struct weston_output *output);
struct weston_head *head;
struct weston_pipewire *pipewire;
uint32_t seq;
struct pw_stream *stream;
struct spa_hook stream_listener;
struct spa_video_info_raw video_format;
struct wl_event_source *finish_frame_timer;
struct wl_list link;
bool submitted_frame;
enum dpms_enum dpms;
};
struct pipewire_frame_data {
struct pipewire_output *output;
int fd;
int stride;
struct drm_fb *drm_buffer;
int fence_sync_fd;
struct wl_event_source *fence_sync_event_source;
};
static void
pipewire_debug_impl(struct weston_pipewire *pipewire,
struct pipewire_output *output,
const char *fmt, va_list ap)
{
FILE *fp;
char *logstr;
size_t logsize;
char timestr[128];
if (!weston_log_scope_is_enabled(pipewire->debug))
return;
fp = open_memstream(&logstr, &logsize);
if (!fp)
return;
weston_log_scope_timestamp(pipewire->debug, timestr, sizeof timestr);
fprintf(fp, "%s", timestr);
if (output)
fprintf(fp, "[%s]", output->output->name);
fprintf(fp, " ");
vfprintf(fp, fmt, ap);
fprintf(fp, "\n");
if (fclose(fp) == 0)
weston_log_scope_write(pipewire->debug, logstr, logsize);
free(logstr);
}
static void
pipewire_output_debug(struct pipewire_output *output, const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
pipewire_debug_impl(output->pipewire, output, fmt, ap);
va_end(ap);
}
static struct weston_pipewire *
weston_pipewire_get(struct weston_compositor *compositor);
static struct pipewire_output *
lookup_pipewire_output(struct weston_output *base_output)
{
struct weston_compositor *c = base_output->compositor;
struct weston_pipewire *pipewire = weston_pipewire_get(c);
struct pipewire_output *output;
/* XXX: This could happen on the compositor shutdown path with our
* destroy listener being removed, and pipewire_output_destroy() being
* called as a virtual destructor.
*
* See https://gitlab.freedesktop.org/wayland/weston/-/issues/591 for
* an alternative to the shutdown sequence.
*/
if (!pipewire)
return NULL;
wl_list_for_each(output, &pipewire->output_list, link) {
if (output->output == base_output)
return output;
}
return NULL;
}
static void
pipewire_output_handle_frame(struct pipewire_output *output, int fd,
int stride, struct drm_fb *drm_buffer)
{
const struct weston_drm_virtual_output_api *api =
output->pipewire->virtual_output_api;
size_t size = output->output->height * stride;
struct pw_buffer *buffer;
struct spa_buffer *spa_buffer;
struct spa_meta_header *h;
void *ptr;
if (pw_stream_get_state(output->stream, NULL) !=
PW_STREAM_STATE_STREAMING)
goto out;
buffer = pw_stream_dequeue_buffer(output->stream);
if (!buffer) {
weston_log("Failed to dequeue a pipewire buffer\n");
goto out;
}
spa_buffer = buffer->buffer;
if ((h = spa_buffer_find_meta_data(spa_buffer, SPA_META_Header,
sizeof(struct spa_meta_header)))) {
struct timespec ts;
clock_gettime(CLOCK_MONOTONIC, &ts);
h->pts = SPA_TIMESPEC_TO_NSEC(&ts);
h->flags = 0;
h->seq = output->seq++;
h->dts_offset = 0;
}
ptr = mmap(NULL, size, PROT_READ, MAP_SHARED, fd, 0);
memcpy(spa_buffer->datas[0].data, ptr, size);
munmap(ptr, size);
spa_buffer->datas[0].chunk->offset = 0;
spa_buffer->datas[0].chunk->stride = stride;
spa_buffer->datas[0].chunk->size = spa_buffer->datas[0].maxsize;
pipewire_output_debug(output, "push frame");
pw_stream_queue_buffer(output->stream, buffer);
out:
close(fd);
output->submitted_frame = true;
api->buffer_released(drm_buffer);
}
static int
pipewire_output_fence_sync_handler(int fd, uint32_t mask, void *data)
{
struct pipewire_frame_data *frame_data = data;
struct pipewire_output *output = frame_data->output;
pipewire_output_handle_frame(output, frame_data->fd, frame_data->stride,
frame_data->drm_buffer);
wl_event_source_remove(frame_data->fence_sync_event_source);
close(frame_data->fence_sync_fd);
free(frame_data);
return 0;
}
static int
pipewire_output_submit_frame(struct weston_output *base_output, int fd,
int stride, struct drm_fb *drm_buffer)
{
struct pipewire_output *output = lookup_pipewire_output(base_output);
struct weston_pipewire *pipewire = output->pipewire;
const struct weston_drm_virtual_output_api *api =
pipewire->virtual_output_api;
struct wl_event_loop *loop;
struct pipewire_frame_data *frame_data;
int fence_sync_fd;
pipewire_output_debug(output, "submit frame: fd = %d drm_fb = %p",
fd, drm_buffer);
fence_sync_fd = api->get_fence_sync_fd(output->output);
if (fence_sync_fd == -1) {
pipewire_output_handle_frame(output, fd, stride, drm_buffer);
return 0;
}
frame_data = zalloc(sizeof *frame_data);
if (!frame_data) {
close(fence_sync_fd);
pipewire_output_handle_frame(output, fd, stride, drm_buffer);
return 0;
}
loop = wl_display_get_event_loop(pipewire->compositor->wl_display);
frame_data->output = output;
frame_data->fd = fd;
frame_data->stride = stride;
frame_data->drm_buffer = drm_buffer;
frame_data->fence_sync_fd = fence_sync_fd;
frame_data->fence_sync_event_source =
wl_event_loop_add_fd(loop, frame_data->fence_sync_fd,
WL_EVENT_READABLE,
pipewire_output_fence_sync_handler,
frame_data);
return 0;
}
static void
pipewire_output_timer_update(struct pipewire_output *output)
{
int64_t msec;
int32_t refresh;
if (pw_stream_get_state(output->stream, NULL) ==
PW_STREAM_STATE_STREAMING)
refresh = output->output->current_mode->refresh;
else
refresh = 1000;
msec = millihz_to_nsec(refresh) / 1000000;
wl_event_source_timer_update(output->finish_frame_timer, msec);
}
static int
pipewire_output_finish_frame_handler(void *data)
{
struct pipewire_output *output = data;
const struct weston_drm_virtual_output_api *api
= output->pipewire->virtual_output_api;
struct timespec now;
if (output->submitted_frame) {
struct weston_compositor *c = output->pipewire->compositor;
output->submitted_frame = false;
weston_compositor_read_presentation_clock(c, &now);
api->finish_frame(output->output, &now, 0);
}
if (output->dpms == WESTON_DPMS_ON)
pipewire_output_timer_update(output);
else
wl_event_source_timer_update(output->finish_frame_timer, 0);
return 0;
}
static void
pipewire_output_destroy(struct weston_output *base_output)
{
struct pipewire_output *output = lookup_pipewire_output(base_output);
struct weston_mode *mode, *next;
if (!output)
return;
weston_head_release(output->head);
wl_list_for_each_safe(mode, next, &base_output->mode_list, link) {
wl_list_remove(&mode->link);
free(mode);
}
pw_stream_destroy(output->stream);
wl_list_remove(&output->link);
free(output->head);
free(output);
}
static int
pipewire_output_start_repaint_loop(struct weston_output *base_output)
{
struct pipewire_output *output = lookup_pipewire_output(base_output);
pipewire_output_debug(output, "start repaint loop");
output->saved_start_repaint_loop(base_output);
pipewire_output_timer_update(output);
return 0;
}
static void
pipewire_set_dpms(struct weston_output *base_output, enum dpms_enum level)
{
struct pipewire_output *output = lookup_pipewire_output(base_output);
if (output->dpms == level)
return;
output->dpms = level;
pipewire_output_finish_frame_handler(output);
}
static int
pipewire_output_connect(struct pipewire_output *output)
{
uint8_t buffer[1024];
struct spa_pod_builder builder =
SPA_POD_BUILDER_INIT(buffer, sizeof(buffer));
const struct spa_pod *params[1];
int frame_rate = output->output->current_mode->refresh / 1000;
int width = output->output->width;
int height = output->output->height;
int ret;
params[0] = spa_pod_builder_add_object(&builder,
SPA_TYPE_OBJECT_Format, SPA_PARAM_EnumFormat,
SPA_FORMAT_mediaType, SPA_POD_Id(SPA_MEDIA_TYPE_video),
SPA_FORMAT_mediaSubtype, SPA_POD_Id(SPA_MEDIA_SUBTYPE_raw),
SPA_FORMAT_VIDEO_format, SPA_POD_Id(SPA_VIDEO_FORMAT_BGRx),
SPA_FORMAT_VIDEO_size, SPA_POD_Rectangle(&SPA_RECTANGLE(width, height)),
SPA_FORMAT_VIDEO_framerate, SPA_POD_Fraction(&SPA_FRACTION (0, 1)),
SPA_FORMAT_VIDEO_maxFramerate,
SPA_POD_CHOICE_RANGE_Fraction(&SPA_FRACTION(frame_rate, 1),
&SPA_FRACTION(1, 1),
&SPA_FRACTION(frame_rate, 1)));
ret = pw_stream_connect(output->stream, PW_DIRECTION_OUTPUT, SPA_ID_INVALID,
(PW_STREAM_FLAG_DRIVER |
PW_STREAM_FLAG_MAP_BUFFERS),
params, 1);
if (ret != 0) {
weston_log("Failed to connect pipewire stream: %s",
spa_strerror(ret));
return -1;
}
return 0;
}
static int
pipewire_output_enable(struct weston_output *base_output)
{
struct pipewire_output *output = lookup_pipewire_output(base_output);
struct weston_compositor *c = base_output->compositor;
const struct weston_drm_virtual_output_api *api
= output->pipewire->virtual_output_api;
struct wl_event_loop *loop;
int ret;
api->set_submit_frame_cb(base_output, pipewire_output_submit_frame);
ret = pipewire_output_connect(output);
if (ret < 0)
return ret;
ret = output->saved_enable(base_output);
if (ret < 0)
return ret;
output->saved_start_repaint_loop = base_output->start_repaint_loop;
base_output->start_repaint_loop = pipewire_output_start_repaint_loop;
base_output->set_dpms = pipewire_set_dpms;
loop = wl_display_get_event_loop(c->wl_display);
output->finish_frame_timer =
wl_event_loop_add_timer(loop,
pipewire_output_finish_frame_handler,
output);
output->dpms = WESTON_DPMS_ON;
return 0;
}
static int
pipewire_output_disable(struct weston_output *base_output)
{
struct pipewire_output *output = lookup_pipewire_output(base_output);
wl_event_source_remove(output->finish_frame_timer);
pw_stream_disconnect(output->stream);
return output->saved_disable(base_output);
}
static void
pipewire_output_stream_state_changed(void *data, enum pw_stream_state old,
enum pw_stream_state state,
const char *error_message)
{
struct pipewire_output *output = data;
pipewire_output_debug(output, "state changed %s -> %s",
pw_stream_state_as_string(old),
pw_stream_state_as_string(state));
switch (state) {
case PW_STREAM_STATE_STREAMING:
weston_output_schedule_repaint(output->output);
break;
default:
break;
}
}
static void
pipewire_output_stream_param_changed(void *data, uint32_t id, const struct spa_pod *format)
{
struct pipewire_output *output = data;
uint8_t buffer[1024];
struct spa_pod_builder builder =
SPA_POD_BUILDER_INIT(buffer, sizeof(buffer));
const struct spa_pod *params[2];
int32_t width, height, stride, size;
const int bpp = 4;
if (!format) {
pipewire_output_debug(output, "format = None");
pw_stream_update_params(output->stream, NULL, 0);
return;
}
spa_format_video_raw_parse(format, &output->video_format);
width = output->video_format.size.width;
height = output->video_format.size.height;
stride = SPA_ROUND_UP_N(width * bpp, 4);
size = height * stride;
pipewire_output_debug(output, "format = %dx%d", width, height);
params[0] = spa_pod_builder_add_object(&builder,
SPA_TYPE_OBJECT_ParamBuffers, SPA_PARAM_Buffers,
SPA_PARAM_BUFFERS_size, SPA_POD_Int(size),
SPA_PARAM_BUFFERS_stride, SPA_POD_Int(stride),
SPA_PARAM_BUFFERS_buffers, SPA_POD_CHOICE_RANGE_Int(4, 2, 8),
SPA_PARAM_BUFFERS_align, SPA_POD_Int(16));
params[1] = spa_pod_builder_add_object(&builder,
SPA_TYPE_OBJECT_ParamMeta, SPA_PARAM_Meta,
SPA_PARAM_META_type, SPA_POD_Id(SPA_META_Header),
SPA_PARAM_META_size, SPA_POD_Int(sizeof(struct spa_meta_header)));
pw_stream_update_params(output->stream, params, 2);
}
static const struct pw_stream_events stream_events = {
PW_VERSION_STREAM_EVENTS,
.state_changed = pipewire_output_stream_state_changed,
.param_changed = pipewire_output_stream_param_changed,
};
static struct weston_output *
pipewire_output_create(struct weston_compositor *c, char *name)
{
struct weston_pipewire *pipewire = weston_pipewire_get(c);
struct pipewire_output *output;
struct weston_head *head;
const struct weston_drm_virtual_output_api *api;
const char *make = "Weston";
const char *model = "Virtual Display";
const char *connector_name = "pipewire";
char *remoting_name;
if (!name || !strlen(name))
return NULL;
api = pipewire->virtual_output_api;
output = zalloc(sizeof *output);
if (!output)
return NULL;
head = zalloc(sizeof *head);
if (!head)
goto err;
output->stream = pw_stream_new(pipewire->core, name, NULL);
if (!output->stream) {
weston_log("Cannot initialize pipewire stream\n");
goto err;
}
pw_stream_add_listener(output->stream, &output->stream_listener,
&stream_events, output);
output->output = api->create_output(c, name, pipewire_output_destroy);
if (!output->output) {
weston_log("Cannot create virtual output\n");
goto err;
}
output->saved_enable = output->output->enable;
output->output->enable = pipewire_output_enable;
output->saved_disable = output->output->disable;
output->output->disable = pipewire_output_disable;
output->pipewire = pipewire;
wl_list_insert(pipewire->output_list.prev, &output->link);
str_printf(&remoting_name, "%s-%s", connector_name, name);
weston_head_init(head, remoting_name);
weston_head_set_subpixel(head, WL_OUTPUT_SUBPIXEL_NONE);
weston_head_set_monitor_strings(head, make, model, NULL);
head->compositor = c;
output->head = head;
weston_output_attach_head(output->output, head);
free(remoting_name);
pipewire_output_debug(output, "created");
return output->output;
err:
if (output->stream)
pw_stream_destroy(output->stream);
if (head)
free(head);
free(output);
return NULL;
}
static bool
pipewire_output_is_pipewire(struct weston_output *output)
{
return lookup_pipewire_output(output) != NULL;
}
static int
pipewire_output_set_mode(struct weston_output *base_output, const char *modeline)
{
struct pipewire_output *output = lookup_pipewire_output(base_output);
const struct weston_drm_virtual_output_api *api =
output->pipewire->virtual_output_api;
struct weston_mode *mode;
int n, width, height, refresh = 0;
if (output == NULL) {
weston_log("Output is not pipewire.\n");
return -1;
}
if (!modeline)
return -1;
n = sscanf(modeline, "%dx%d@%d", &width, &height, &refresh);
if (n != 2 && n != 3)
return -1;
if (pw_stream_get_state(output->stream, NULL) !=
PW_STREAM_STATE_UNCONNECTED) {
return -1;
}
mode = zalloc(sizeof *mode);
if (!mode)
return -1;
pipewire_output_debug(output, "mode = %dx%d@%d", width, height, refresh);
mode->flags = WL_OUTPUT_MODE_CURRENT;
mode->width = width;
mode->height = height;
mode->refresh = (refresh ? refresh : 60) * 1000LL;
wl_list_insert(base_output->mode_list.prev, &mode->link);
base_output->current_mode = mode;
api->set_gbm_format(base_output, "XRGB8888");
return 0;
}
static void
pipewire_output_set_seat(struct weston_output *output, const char *seat)
{
}
static void
weston_pipewire_destroy(struct wl_listener *l, void *data)
{
struct weston_pipewire *pipewire =
wl_container_of(l, pipewire, destroy_listener);
struct pipewire_output *p_output, *p_output_next;
weston_log_scope_destroy(pipewire->debug);
pipewire->debug = NULL;
wl_list_for_each_safe(p_output, p_output_next, &pipewire->output_list, link)
pipewire_output_destroy(p_output->output);
wl_event_source_remove(pipewire->loop_source);
pw_loop_leave(pipewire->loop);
pw_loop_destroy(pipewire->loop);
free(pipewire);
}
static struct weston_pipewire *
weston_pipewire_get(struct weston_compositor *compositor)
{
struct wl_listener *listener;
struct weston_pipewire *pipewire;
listener = wl_signal_get(&compositor->destroy_signal,
weston_pipewire_destroy);
if (!listener)
return NULL;
pipewire = wl_container_of(listener, pipewire, destroy_listener);
return pipewire;
}
static int
weston_pipewire_loop_handler(int fd, uint32_t mask, void *data)
{
struct weston_pipewire *pipewire = data;
int ret;
ret = pw_loop_iterate(pipewire->loop, 0);
if (ret < 0)
weston_log("pipewire_loop_iterate failed: %s",
spa_strerror(ret));
return 0;
}
static void
weston_pipewire_error(void *data, uint32_t id, int seq, int res,
const char *error)
{
weston_log("pipewire remote error: %s\n", error);
}
static const struct pw_core_events core_events = {
PW_VERSION_CORE_EVENTS,
.error = weston_pipewire_error,
};
static int
weston_pipewire_init(struct weston_pipewire *pipewire)
{
struct wl_event_loop *loop;
pw_init(NULL, NULL);
pipewire->loop = pw_loop_new(NULL);
if (!pipewire->loop)
return -1;
pw_loop_enter(pipewire->loop);
pipewire->context = pw_context_new(pipewire->loop, NULL, 0);
pipewire->core = pw_context_connect(pipewire->context, NULL, 0);
pw_core_add_listener(pipewire->core,
&pipewire->core_listener,
&core_events, pipewire);
loop = wl_display_get_event_loop(pipewire->compositor->wl_display);
pipewire->loop_source =
wl_event_loop_add_fd(loop, pw_loop_get_fd(pipewire->loop),
WL_EVENT_READABLE,
weston_pipewire_loop_handler,
pipewire);
return 0;
}
static const struct weston_pipewire_api pipewire_api = {
pipewire_output_create,
pipewire_output_is_pipewire,
pipewire_output_set_mode,
pipewire_output_set_seat,
};
WL_EXPORT int
weston_module_init(struct weston_compositor *compositor)
{
int ret;
struct weston_pipewire *pipewire;
const struct weston_drm_virtual_output_api *api =
weston_drm_virtual_output_get_api(compositor);
if (!api)
return -1;
pipewire = zalloc(sizeof *pipewire);
if (!pipewire)
return -1;
if (!weston_compositor_add_destroy_listener_once(compositor,
&pipewire->destroy_listener,
weston_pipewire_destroy)) {
free(pipewire);
return 0;
}
pipewire->virtual_output_api = api;
pipewire->compositor = compositor;
wl_list_init(&pipewire->output_list);
ret = weston_plugin_api_register(compositor, WESTON_PIPEWIRE_API_NAME,
&pipewire_api, sizeof(pipewire_api));
if (ret < 0) {
weston_log("Failed to register pipewire API.\n");
goto failed;
}
ret = weston_pipewire_init(pipewire);
if (ret < 0) {
weston_log("Failed to initialize pipewire.\n");
goto failed;
}
pipewire->debug =
weston_compositor_add_log_scope(compositor, "pipewire",
"Debug messages from pipewire plugin\n",
NULL, NULL, NULL);
return 0;
failed:
wl_list_remove(&pipewire->destroy_listener.link);
free(pipewire);
return -1;
}