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/*
* Copyright (C) 2024 Mikhail Burakov. This file is part of streamer.
*
* streamer is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* streamer is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with streamer. If not, see <https://www.gnu.org/licenses/>.
*/
#include "video_context.h"
#include <assert.h>
#include <errno.h>
#include <pipewire/pipewire.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <threads.h>
#include <wayland-client.h>
#include "util.h"
#include "wlr-export-dmabuf-unstable-v1.h"
struct VideoContext {
struct IoContext* io_context;
// Wayland globals
struct wl_display* display;
struct wl_registry* registry;
struct wl_output* output;
struct zwlr_export_dmabuf_manager_v1* export_dmabuf_manager;
// Threading
struct pw_thread_loop* thread_loop;
struct spa_source* source;
};
static void OnRegistryGlobal(void* data, struct wl_registry* wl_registry,
uint32_t name, const char* interface,
uint32_t version) {
#define MAYBE_BIND(a, b) \
if (!strcmp(interface, a.name)) do { \
if (!b) b = wl_registry_bind(wl_registry, name, &a, version); \
if (!b) LOG("Failed to bind " #a " (%s)", strerror(errno)); \
return; \
} while (false)
struct VideoContext* video_context = data;
MAYBE_BIND(wl_output_interface, video_context->output);
MAYBE_BIND(zwlr_export_dmabuf_manager_v1_interface,
video_context->export_dmabuf_manager);
#undef MAYBE_BIND
}
static void OnRegistryGlobalRemove(void* data, struct wl_registry* registry,
uint32_t name) {
(void)data;
(void)registry;
(void)name;
}
static bool InitWaylandGlobals(struct VideoContext* video_context) {
video_context->display = wl_display_connect(NULL);
if (!video_context->display) {
LOG("Failed to open display");
return false;
}
video_context->registry = wl_display_get_registry(video_context->display);
if (!video_context->registry) {
LOG("Failed to get registry");
goto rollback_display;
}
static const struct wl_registry_listener kRegistryListener = {
.global = OnRegistryGlobal,
.global_remove = OnRegistryGlobalRemove,
};
if (wl_registry_add_listener(video_context->registry, &kRegistryListener,
video_context)) {
LOG("Failed to add registry listener");
goto rollback_registry;
}
if (wl_display_roundtrip(video_context->display) == -1) {
LOG("Failed to roundtrip display");
goto rollback_registry;
}
if (!video_context->output || !video_context->export_dmabuf_manager) {
LOG("Some required globals are missing");
goto rollback_globals;
}
return true;
rollback_globals:
if (video_context->export_dmabuf_manager)
zwlr_export_dmabuf_manager_v1_destroy(video_context->export_dmabuf_manager);
if (video_context->output) wl_output_destroy(video_context->output);
rollback_registry:
wl_registry_destroy(video_context->registry);
rollback_display:
wl_display_disconnect(video_context->display);
return false;
}
static void OnDisplayData(void* arg, int fd, uint32_t mask) {
(void)fd;
(void)mask;
struct VideoContext* video_context = arg;
if (wl_display_dispatch(video_context->display) == -1) {
LOG("Failed to dispatch display");
// TODO(mburakov): Now what?..
}
}
struct VideoContext* VideoContextCreate(struct IoContext* io_context) {
struct VideoContext* video_context = malloc(sizeof(struct VideoContext));
if (!video_context) {
LOG("Failed to allocate video context (%s)", strerror(errno));
return NULL;
}
*video_context = (struct VideoContext){
.io_context = io_context,
};
if (!InitWaylandGlobals(video_context)) {
LOG("Failed to init wayland globals");
goto rollback_video_context;
}
video_context->thread_loop = pw_thread_loop_new("video-capture", NULL);
if (!video_context->thread_loop) {
LOG("Failed to create thread loop");
goto rollback_wayland_globals;
}
pw_thread_loop_lock(video_context->thread_loop);
if (pw_thread_loop_start(video_context->thread_loop)) {
LOG("Failed to start thread loop");
goto rollback_thread_loop;
}
int events_fd = wl_display_get_fd(video_context->display);
if (events_fd == -1) {
LOG("Failed to get display fd");
goto rollback_thread_loop;
}
video_context->source =
pw_loop_add_io(pw_thread_loop_get_loop(video_context->thread_loop),
events_fd, SPA_IO_IN, false, OnDisplayData, video_context);
if (!video_context->source) {
LOG("Failed to add thread loop io");
goto rollback_thread_loop;
}
pw_thread_loop_unlock(video_context->thread_loop);
return video_context;
rollback_thread_loop:
pw_thread_loop_unlock(video_context->thread_loop);
pw_thread_loop_destroy(video_context->thread_loop);
rollback_wayland_globals:
zwlr_export_dmabuf_manager_v1_destroy(video_context->export_dmabuf_manager);
wl_output_destroy(video_context->output);
wl_registry_destroy(video_context->registry);
wl_display_disconnect(video_context->display);
rollback_video_context:
free(video_context);
return NULL;
}
void VideoContextDestroy(struct VideoContext* video_context) {
pw_thread_loop_lock(video_context->thread_loop);
assert(pw_loop_destroy_source(
pw_thread_loop_get_loop(video_context->thread_loop),
video_context->source));
pw_thread_loop_unlock(video_context->thread_loop);
pw_thread_loop_destroy(video_context->thread_loop);
zwlr_export_dmabuf_manager_v1_destroy(video_context->export_dmabuf_manager);
wl_output_release(video_context->output);
wl_registry_destroy(video_context->registry);
wl_display_disconnect(video_context->display);
free(video_context);
}
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