screen_linux.c

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#include "config.h"
#include "config_unix.h"
#include "config_win32.h"
 
#include <stdlib.h>
#include <string.h>
 
#include "debug.h"
#include "lib_common.h"
#include "utils/color_out.h"
#include "utils/text.h"
#include "video_capture.h"
 
static void vidcap_screen_linux_probe(struct device_info **cards, int *count, void (**deleter)(void *))
{
        *cards = NULL;
        *count = 0;
        *deleter = free;
}
 
static int
vidcap_screen_linux_init(struct vidcap_params *params, void **state)
{
        struct vidcap *device = NULL;
 
        if (strcmp(vidcap_params_get_fmt(params), "help") == 0) {
                char desc[] = TRED(TBOLD("screen")) " capture in Linux abstracts X11/PipeWire screen capture and tries to select "
                        "the right implementation. You can also specify directly " TBOLD("screen_x11") " or " TBOLD("screen_pw") ".";
                color_printf("%s\n\n", wrap_paragraph(desc));
                color_printf("Compiled modules:");
#ifdef HAVE_SCREEN_X11
                color_printf(TBOLD(" X11"));
#endif
#ifdef HAVE_SCREEN_PW
                color_printf(TBOLD(" pipewire"));
#endif
                printf("\n\nFollows help for the module that would have been selected:\n\n");
        }
 
        struct vidcap_params *params_new = vidcap_params_copy(params);
        if (getenv("WAYLAND_DISPLAY") != NULL) {
                vidcap_params_set_driver(params_new, "screen_pw");
                verbose_msg("Trying to initialize screen_pw\n");
                int ret = initialize_video_capture(NULL, params_new, &device);
                if (ret < 0) {
                        error_msg("screen_pw initialization failed\n");
                } else {
                        vidcap_params_free_struct(params_new);
                        *state = device;
                        return ret;
                }
        }
        verbose_msg("Trying to initialize screen_x11\n");
        if (getenv("DISPLAY") == NULL) {
                log_msg(LOG_LEVEL_WARNING, "Trying to initalize screen_x11 but DISPLAY environment variable is not set!\n");
        }
        vidcap_params_set_driver(params_new, "screen_x11");
        int ret = initialize_video_capture(NULL, params_new, &device);
        vidcap_params_free_struct(params_new);
 
        *state = device;
        return ret;
}
 
static void
vidcap_screen_linux_done(void *state)
{
        vidcap_done((struct vidcap *) state);
}
 
static struct video_frame *
vidcap_screen_linux_grab(void *state, struct audio_frame **audio)
{
        return vidcap_grab((struct vidcap *) state, audio);
}
 
static const struct video_capture_info vidcap_screen_linux_info = {
        vidcap_screen_linux_probe,
        vidcap_screen_linux_init,
        vidcap_screen_linux_done,
        vidcap_screen_linux_grab,
        "[screen] ",
};
 
REGISTER_MODULE(screen, &vidcap_screen_linux_info, LIBRARY_CLASS_VIDEO_CAPTURE, VIDEO_CAPTURE_ABI_VERSION);