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mpv/video/out/drm_common.c

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/*
* This file is part of mpv.
*
* mpv is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* mpv 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with mpv. If not, see <http://www.gnu.org/licenses/>.
*/
#include <errno.h>
#include <signal.h>
#include <sys/ioctl.h>
#include <sys/poll.h>
#include <sys/vt.h>
#include <unistd.h>
#include "drm_common.h"
#include "common/common.h"
#include "common/msg.h"
#include "osdep/io.h"
#define EVT_RELEASE 1
#define EVT_ACQUIRE 2
#define EVT_INTERRUPT 255
#define HANDLER_ACQUIRE 0
#define HANDLER_RELEASE 1
#define RELEASE_SIGNAL SIGUSR1
#define ACQUIRE_SIGNAL SIGUSR2
static int vt_switcher_pipe[2];
// KMS ------------------------------------------------------------------------
static bool is_connector_valid(struct kms *kms, int connector_id,
drmModeConnector *connector, bool silent)
{
if (!connector) {
if (!silent) {
MP_ERR(kms, "Cannot get connector %d: %s\n", connector_id,
mp_strerror(errno));
}
return false;
}
if (connector->connection != DRM_MODE_CONNECTED) {
if (!silent) {
MP_ERR(kms, "Connector %d is disconnected\n", connector_id);
}
return false;
}
if (connector->count_modes == 0) {
if (!silent) {
MP_ERR(kms, "Connector %d has no valid modes\n", connector_id);
}
return false;
}
return true;
}
static bool setup_connector(
struct kms *kms, const drmModeRes *res, int connector_id)
{
drmModeConnector *connector = NULL;
if (connector_id == -1) {
// get the first connected connector
for (int i = 0; i < res->count_connectors; i++) {
connector = drmModeGetConnector(kms->fd, res->connectors[i]);
if (is_connector_valid(kms, i, connector, true)) {
connector_id = i;
break;
}
if (connector) {
drmModeFreeConnector(connector);
connector = NULL;
}
}
if (connector_id == -1) {
MP_ERR(kms, "No connected connectors found\n");
return false;
}
}
if (connector_id < 0 || connector_id >= res->count_connectors) {
MP_ERR(kms, "Bad connector ID. Max valid connector ID = %u\n",
res->count_connectors);
return false;
}
connector = drmModeGetConnector(kms->fd, res->connectors[connector_id]);
if (!is_connector_valid(kms, connector_id, connector, false))
return false;
kms->connector = connector;
return true;
}
static bool setup_crtc(struct kms *kms, const drmModeRes *res)
{
for (unsigned int i = 0; i < kms->connector->count_encoders; ++i) {
drmModeEncoder *encoder
= drmModeGetEncoder(kms->fd, kms->connector->encoders[i]);
if (!encoder) {
MP_WARN(kms, "Cannot retrieve encoder %u:%u: %s\n",
i, kms->connector->encoders[i], mp_strerror(errno));
continue;
}
// iterate all global CRTCs
for (unsigned int j = 0; j < res->count_crtcs; ++j) {
// check whether this CRTC works with the encoder
if (!(encoder->possible_crtcs & (1 << j)))
continue;
kms->encoder = encoder;
kms->crtc_id = res->crtcs[j];
return true;
}
drmModeFreeEncoder(encoder);
}
MP_ERR(kms,
"Connector %u has no suitable CRTC\n",
kms->connector->connector_id);
return false;
}
static bool setup_mode(struct kms *kms, int mode_id)
{
if (mode_id < 0 || mode_id >= kms->connector->count_modes) {
MP_ERR(
kms,
"Bad mode ID (max = %d).\n",
kms->connector->count_modes - 1);
MP_INFO(kms, "Available modes:\n");
for (unsigned int i = 0; i < kms->connector->count_modes; i++) {
MP_INFO(kms,
"Mode %d: %s (%dx%d)\n",
i,
kms->connector->modes[i].name,
kms->connector->modes[i].hdisplay,
kms->connector->modes[i].vdisplay);
}
return false;
}
kms->mode = kms->connector->modes[mode_id];
return true;
}
struct kms *kms_create(struct mp_log *log)
{
struct kms *ret = talloc(NULL, struct kms);
*ret = (struct kms) {
.log = mp_log_new(ret, log, "kms"),
.fd = -1,
.connector = NULL,
.encoder = NULL,
.mode = { 0 },
.crtc_id = -1,
};
return ret;
}
bool kms_setup(struct kms *kms, const char *device_path, int connector_id, int mode_id)
{
kms->fd = open(device_path, O_RDWR | O_CLOEXEC);
if (kms->fd < 0) {
MP_ERR(kms, "Cannot open \"%s\": %s.\n", device_path, mp_strerror(errno));
return false;
}
drmModeRes *res = drmModeGetResources(kms->fd);
if (!res) {
MP_ERR(kms, "Cannot retrieve DRM resources: %s\n", mp_strerror(errno));
return false;
}
if (!setup_connector(kms, res, connector_id))
return false;
if (!setup_crtc(kms, res))
return false;
if (!setup_mode(kms, mode_id))
return false;
return true;
}
void kms_destroy(struct kms *kms)
{
if (!kms)
return;
if (kms->connector) {
drmModeFreeConnector(kms->connector);
kms->connector = NULL;
}
if (kms->encoder) {
drmModeFreeEncoder(kms->encoder);
kms->encoder = NULL;
}
close(kms->fd);
talloc_free(kms);
}
// VT switcher ----------------------------------------------------------------
static void vt_switcher_sighandler(int sig)
{
unsigned char event = sig == RELEASE_SIGNAL ? EVT_RELEASE : EVT_ACQUIRE;
(void)write(vt_switcher_pipe[1], &event, sizeof(event));
}
static bool has_signal_installed(int signo)
{
struct sigaction act = { 0 };
sigaction(signo, 0, &act);
return act.sa_handler != 0;
}
static int install_signal(int signo, void (*handler)(int))
{
struct sigaction act = { 0 };
act.sa_handler = handler;
sigemptyset(&act.sa_mask);
act.sa_flags = SA_RESTART;
return sigaction(signo, &act, NULL);
}
bool vt_switcher_init(struct vt_switcher *s, struct mp_log *log)
{
s->log = log;
s->tty_fd = -1;
vt_switcher_pipe[0] = -1;
vt_switcher_pipe[1] = -1;
if (mp_make_cloexec_pipe(vt_switcher_pipe)) {
MP_ERR(s, "Creating pipe failed: %s\n", mp_strerror(errno));
return false;
}
s->tty_fd = open("/dev/tty", O_RDWR | O_CLOEXEC);
if (s->tty_fd < 0) {
MP_ERR(s, "Can't open TTY for VT control: %s\n", mp_strerror(errno));
return false;
}
if (has_signal_installed(RELEASE_SIGNAL)) {
MP_ERR(s, "Can't handle VT release - signal already used\n");
return false;
}
if (has_signal_installed(ACQUIRE_SIGNAL)) {
MP_ERR(s, "Can't handle VT acquire - signal already used\n");
return false;
}
if (install_signal(RELEASE_SIGNAL, vt_switcher_sighandler)) {
MP_ERR(s, "Failed to install release signal: %s\n", mp_strerror(errno));
return false;
}
if (install_signal(ACQUIRE_SIGNAL, vt_switcher_sighandler)) {
MP_ERR(s, "Failed to install acquire signal: %s\n", mp_strerror(errno));
return false;
}
struct vt_mode vt_mode;
if (ioctl(s->tty_fd, VT_GETMODE, &vt_mode) < 0) {
MP_ERR(s, "VT_GETMODE failed: %s\n", mp_strerror(errno));
return false;
}
vt_mode.mode = VT_PROCESS;
vt_mode.relsig = RELEASE_SIGNAL;
vt_mode.acqsig = ACQUIRE_SIGNAL;
if (ioctl(s->tty_fd, VT_SETMODE, &vt_mode) < 0) {
MP_ERR(s, "VT_SETMODE failed: %s\n", mp_strerror(errno));
return false;
}
return true;
}
void vt_switcher_acquire(struct vt_switcher *s,
void (*handler)(void*), void *user_data)
{
s->handlers[HANDLER_ACQUIRE] = handler;
s->handler_data[HANDLER_ACQUIRE] = user_data;
}
void vt_switcher_release(struct vt_switcher *s,
void (*handler)(void*), void *user_data)
{
s->handlers[HANDLER_RELEASE] = handler;
s->handler_data[HANDLER_RELEASE] = user_data;
}
void vt_switcher_interrupt_poll(struct vt_switcher *s)
{
unsigned char event = EVT_INTERRUPT;
(void)write(vt_switcher_pipe[1], &event, sizeof(event));
}
void vt_switcher_destroy(struct vt_switcher *s)
{
install_signal(RELEASE_SIGNAL, SIG_DFL);
install_signal(ACQUIRE_SIGNAL, SIG_DFL);
close(s->tty_fd);
close(vt_switcher_pipe[0]);
close(vt_switcher_pipe[1]);
}
void vt_switcher_poll(struct vt_switcher *s, int timeout_ms)
{
struct pollfd fds[1] = {
{ .events = POLLIN, .fd = vt_switcher_pipe[0] },
};
poll(fds, 1, timeout_ms);
if (!fds[0].revents)
return;
unsigned char event;
if (read(fds[0].fd, &event, sizeof(event)) != sizeof(event))
return;
switch (event) {
case EVT_RELEASE:
s->handlers[HANDLER_RELEASE](s->handler_data[HANDLER_RELEASE]);
if (ioctl(s->tty_fd, VT_RELDISP, 1) < 0) {
MP_ERR(s, "Failed to release virtual terminal\n");
}
break;
case EVT_ACQUIRE:
s->handlers[HANDLER_ACQUIRE](s->handler_data[HANDLER_ACQUIRE]);
if (ioctl(s->tty_fd, VT_RELDISP, VT_ACKACQ) < 0) {
MP_ERR(s, "Failed to acquire virtual terminal\n");
}
break;
case EVT_INTERRUPT:
break;
}
}
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