sway/swaygrab/main.c

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#define _XOPEN_SOURCE 700
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#define _POSIX_C_SOURCE 199309L
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#include <stdio.h>
#include <stdbool.h>
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#include <stdlib.h>
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#include <string.h>
#include <getopt.h>
#include <unistd.h>
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#include <stdint.h>
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#include <math.h>
#include <time.h>
#include <json-c/json.h>
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#include "log.h"
#include "ipc-client.h"
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#include "util.h"
#include "swaygrab/json.h"
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void sway_terminate(int exit_code) {
exit(exit_code);
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}
void grab_and_apply_magick(const char *file, const char *payload,
int socketfd, int raw) {
uint32_t len = strlen(payload);
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char *pixels = ipc_single_command(socketfd,
IPC_SWAY_GET_PIXELS, payload, &len);
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uint32_t *u32pixels = (uint32_t *)(pixels + 1);
uint32_t width = u32pixels[0];
uint32_t height = u32pixels[1];
len -= 9;
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pixels += 9;
if (width == 0 || height == 0) {
// indicates geometry was clamped by WLC because it was outside of the output's area
json_object *obj = json_tokener_parse(payload);
json_object *output;
json_object_object_get_ex(obj, "output", &output);
const char *name = json_object_get_string(output);
json_object_put(obj);
sway_abort("Unknown output %s.", name);
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}
if (raw) {
fwrite(pixels, 1, len, stdout);
fflush(stdout);
free(pixels - 9);
return;
}
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const char *fmt = "convert -depth 8 -size %dx%d+0 rgba:- -flip %s";
char *cmd = malloc(strlen(fmt) - 6 /*args*/
+ numlen(width) + numlen(height) + strlen(file) + 1);
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sprintf(cmd, fmt, width, height, file);
FILE *f = popen(cmd, "w");
fwrite(pixels, 1, len, f);
fflush(f);
fclose(f);
free(pixels - 9);
free(cmd);
}
void grab_and_apply_movie_magic(const char *file, const char *payload,
int socketfd, int raw, int framerate) {
if (raw) {
sway_log(L_ERROR, "Raw capture data is not yet supported. Proceeding with ffmpeg normally.");
}
uint32_t len = strlen(payload);
char *pixels = ipc_single_command(socketfd,
IPC_SWAY_GET_PIXELS, payload, &len);
uint32_t *u32pixels = (uint32_t *)(pixels + 1);
uint32_t width = u32pixels[0];
uint32_t height = u32pixels[1];
pixels += 9;
if (width == 0 || height == 0) {
// indicates geometry was clamped by WLC because it was outside of the output's area
json_object *obj = json_tokener_parse(payload);
json_object *output;
json_object_object_get_ex(obj, "output", &output);
const char *name = json_object_get_string(output);
json_object_put(obj);
sway_abort("Unknown output %s.", name);
}
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char *ffmpeg_opts = getenv("SWAYGRAB_FFMPEG_OPTS");
if(!ffmpeg_opts) {
ffmpeg_opts = "";
}
const char *fmt = "ffmpeg %s -f rawvideo -framerate %d "
"-video_size %dx%d -pixel_format argb "
"-i pipe:0 -r %d -vf vflip %s";
char *cmd = malloc(strlen(fmt) - 8 /*args*/
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+ strlen(ffmpeg_opts) + numlen(width) + numlen(height)
+ numlen(framerate) * 2 + strlen(file) + 1);
sprintf(cmd, fmt, ffmpeg_opts, framerate, width, height, framerate, file);
long ns = (long)(1000000000 * (1.0 / framerate));
struct timespec start, finish, ts;
ts.tv_sec = 0;
FILE *f = popen(cmd, "w");
fwrite(pixels, 1, len, f);
free(pixels - 9);
int sleep = 0;
while (sleep != -1) {
clock_gettime(CLOCK_MONOTONIC, &start);
len = strlen(payload);
pixels = ipc_single_command(socketfd,
IPC_SWAY_GET_PIXELS, payload, &len);
pixels += 9;
len -= 9;
fwrite(pixels, 1, len, f);
free(pixels - 9);
clock_gettime(CLOCK_MONOTONIC, &finish);
ts.tv_nsec = ns;
double fts = (double)finish.tv_sec + 1.0e-9*finish.tv_nsec;
double sts = (double)start.tv_sec + 1.0e-9*start.tv_nsec;
long diff = (fts - sts) * 1000000000;
ts.tv_nsec = ns - diff;
if (ts.tv_nsec < 0) {
ts.tv_nsec = 0;
}
sleep = nanosleep(&ts, NULL);
}
fflush(f);
fclose(f);
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free(cmd);
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}
char *default_filename(const char *extension) {
int ext_len = strlen(extension);
int len = 28 + ext_len; // format: "2015-12-17-180040_swaygrab.ext"
char *filename = malloc(len * sizeof(char));
time_t t = time(NULL);
struct tm *lt = localtime(&t);
strftime(filename, len, "%Y-%m-%d-%H%M%S_swaygrab.", lt);
strncat(filename, extension, ext_len);
return filename;
}
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int main(int argc, char **argv) {
static int capture = 0, raw = 0;
char *socket_path = NULL;
char *output = NULL;
int framerate = 30;
bool grab_focused = false;
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init_log(L_INFO);
static struct option long_options[] = {
{"help", no_argument, NULL, 'h'},
{"capture", no_argument, NULL, 'c'},
{"output", required_argument, NULL, 'o'},
{"version", no_argument, NULL, 'v'},
{"socket", required_argument, NULL, 's'},
{"raw", no_argument, NULL, 'r'},
{"rate", required_argument, NULL, 'R'},
{"focused", no_argument, NULL, 'f'},
{0, 0, 0, 0}
};
const char *usage =
"Usage: swaygrab [options] [file]\n"
"\n"
" -h, --help Show help message and quit.\n"
" -c, --capture Capture video.\n"
" -o, --output <output> Output source.\n"
" -v, --version Show the version number and quit.\n"
" -s, --socket <socket> Use the specified socket.\n"
" -R, --rate <rate> Specify framerate (default: 30)\n"
" -r, --raw Write raw rgba data to stdout.\n"
" -f, --focused Grab the focused container.\n";
int c;
while (1) {
int option_index = 0;
c = getopt_long(argc, argv, "hco:vs:R:rf", long_options, &option_index);
if (c == -1) {
break;
}
switch (c) {
case 'f':
grab_focused = true;
break;
case 's': // Socket
socket_path = strdup(optarg);
break;
case 'r':
raw = 1;
break;
case 'o': // output
output = strdup(optarg);
break;
case 'c':
capture = 1;
break;
case 'R': // Frame rate
framerate = atoi(optarg);
break;
case 'v':
fprintf(stdout, "sway version " SWAY_VERSION "\n");
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exit(EXIT_SUCCESS);
break;
default:
fprintf(stderr, "%s", usage);
exit(EXIT_FAILURE);
}
}
if (!socket_path) {
socket_path = get_socketpath();
if (!socket_path) {
sway_abort("Unable to retrieve socket path");
}
}
char *file = NULL;
if (raw) {
if (optind >= argc + 1) {
sway_abort("Invalid usage. See `man swaygrab` %d %d", argc, optind);
}
} else if (optind < argc) {
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file = strdup(argv[optind]);
}
int socketfd = ipc_open_socket(socket_path);
free(socket_path);
init_json_tree(socketfd);
struct wlc_geometry *geo;
if (grab_focused) {
output = get_focused_output();
json_object *con = get_focused_container();
json_object *name;
json_object_object_get_ex(con, "name", &name);
geo = get_container_geometry(con);
free(con);
} else {
if (!output) {
output = get_focused_output();
}
geo = get_container_geometry(get_output_container(output));
// the geometry of the output in the get_tree response is relative to a global (0, 0).
// we need it to be relative to itself, so set origin to (0, 0) always.
geo->origin.x = 0;
geo->origin.y = 0;
}
const char *payload = create_payload(output, geo);
free(geo);
if (!file) {
if (!capture) {
file = default_filename("png");
} else {
file = default_filename("webm");
}
}
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if (!capture) {
grab_and_apply_magick(file, payload, socketfd, raw);
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} else {
grab_and_apply_movie_magic(file, payload, socketfd, raw, framerate);
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}
free_json_tree();
free(output);
free(file);
close(socketfd);
return 0;
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}