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mpv/video/out/vo.c

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/*
* This file is part of MPlayer.
*
* MPlayer 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 2 of the License, or
* (at your option) any later version.
*
* MPlayer 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 MPlayer; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <assert.h>
#include <stdbool.h>
#include <pthread.h>
#ifndef __MINGW32__
#include <unistd.h>
#include <poll.h>
#endif
#include "talloc.h"
#include "config.h"
#include "osdep/timer.h"
#include "osdep/threads.h"
#include "misc/dispatch.h"
#include "misc/rendezvous.h"
#include "options/options.h"
#include "misc/bstr.h"
#include "vo.h"
#include "aspect.h"
#include "input/input.h"
#include "options/m_config.h"
#include "common/msg.h"
#include "common/global.h"
#include "video/mp_image.h"
#include "video/vfcap.h"
#include "sub/osd.h"
#include "osdep/io.h"
extern const struct vo_driver video_out_x11;
extern const struct vo_driver video_out_vdpau;
extern const struct vo_driver video_out_xv;
extern const struct vo_driver video_out_opengl;
extern const struct vo_driver video_out_opengl_hq;
extern const struct vo_driver video_out_opengl_old;
extern const struct vo_driver video_out_null;
extern const struct vo_driver video_out_image;
extern const struct vo_driver video_out_lavc;
extern const struct vo_driver video_out_caca;
extern const struct vo_driver video_out_direct3d;
extern const struct vo_driver video_out_direct3d_shaders;
extern const struct vo_driver video_out_sdl;
extern const struct vo_driver video_out_corevideo;
extern const struct vo_driver video_out_vaapi;
extern const struct vo_driver video_out_wayland;
const struct vo_driver *const video_out_drivers[] =
{
#if HAVE_GL
&video_out_opengl,
#endif
#if HAVE_VDPAU
&video_out_vdpau,
#endif
#if HAVE_DIRECT3D
&video_out_direct3d_shaders,
&video_out_direct3d,
#endif
#if HAVE_COREVIDEO
&video_out_corevideo,
#endif
#if HAVE_XV
&video_out_xv,
#endif
#if HAVE_SDL2
&video_out_sdl,
#endif
#if HAVE_GL
&video_out_opengl_old,
#endif
#if HAVE_VAAPI
&video_out_vaapi,
#endif
#if HAVE_X11
&video_out_x11,
#endif
&video_out_null,
// should not be auto-selected
&video_out_image,
#if HAVE_CACA
&video_out_caca,
#endif
#if HAVE_ENCODING
&video_out_lavc,
#endif
#if HAVE_GL
&video_out_opengl_hq,
#endif
#if HAVE_WAYLAND
&video_out_wayland,
#endif
NULL
};
struct vo_internal {
pthread_t thread;
struct mp_dispatch_queue *dispatch;
// --- The following fields are protected by lock
pthread_mutex_t lock;
pthread_cond_t wakeup;
bool need_wakeup;
bool terminate;
int wakeup_pipe[2]; // used for VOs that use a unix FD for waiting
bool hasframe;
bool hasframe_rendered;
bool request_redraw;
bool paused;
int64_t flip_queue_offset; // queue flip events at most this much in advance
int64_t drop_count;
bool dropped_frame; // the previous frame was dropped
struct mp_image *dropped_image; // used to possibly redraw the dropped frame
int64_t wakeup_pts; // time at which to pull frame from decoder
bool rendering; // true if an image is being rendered
struct mp_image *frame_queued; // the image that should be rendered
int64_t frame_pts; // realtime of intended display
int64_t frame_duration; // realtime frame duration (for framedrop)
// --- The following fields can be accessed from the VO thread only
int64_t vsync_interval;
int64_t last_flip;
char *window_title;
};
static void forget_frames(struct vo *vo);
static void *vo_thread(void *ptr);
static bool get_desc(struct m_obj_desc *dst, int index)
{
if (index >= MP_ARRAY_SIZE(video_out_drivers) - 1)
return false;
const struct vo_driver *vo = video_out_drivers[index];
*dst = (struct m_obj_desc) {
.name = vo->name,
.description = vo->description,
.priv_size = vo->priv_size,
.priv_defaults = vo->priv_defaults,
.options = vo->options,
.hidden = vo->encode,
.p = vo,
};
return true;
}
// For the vo option
const struct m_obj_list vo_obj_list = {
.get_desc = get_desc,
.description = "video outputs",
.aliases = {
{"gl", "opengl"},
{"gl3", "opengl-hq"},
{0}
},
.allow_unknown_entries = true,
.allow_trailer = true,
};
static void dispatch_wakeup_cb(void *ptr)
{
struct vo *vo = ptr;
vo_wakeup(vo);
}
// Does not include thread- and VO uninit.
static void dealloc_vo(struct vo *vo)
{
forget_frames(vo); // implicitly synchronized
pthread_mutex_destroy(&vo->in->lock);
pthread_cond_destroy(&vo->in->wakeup);
for (int n = 0; n < 2; n++)
close(vo->in->wakeup_pipe[n]);
talloc_free(vo);
}
static struct vo *vo_create(struct mpv_global *global,
struct input_ctx *input_ctx, struct osd_state *osd,
struct encode_lavc_context *encode_lavc_ctx,
char *name, char **args)
{
struct mp_log *log = mp_log_new(NULL, global->log, "vo");
struct m_obj_desc desc;
if (!m_obj_list_find(&desc, &vo_obj_list, bstr0(name))) {
mp_msg(log, MSGL_ERR, "Video output %s not found!\n", name);
talloc_free(log);
return NULL;
};
struct vo *vo = talloc_ptrtype(NULL, vo);
*vo = (struct vo) {
.log = mp_log_new(vo, log, name),
.driver = desc.p,
.opts = &global->opts->vo,
.global = global,
.encode_lavc_ctx = encode_lavc_ctx,
.input_ctx = input_ctx,
.osd = osd,
.event_fd = -1,
.monitor_par = 1,
.in = talloc(vo, struct vo_internal),
};
talloc_steal(vo, log);
*vo->in = (struct vo_internal) {
.dispatch = mp_dispatch_create(vo),
};
mp_make_wakeup_pipe(vo->in->wakeup_pipe);
mp_dispatch_set_wakeup_fn(vo->in->dispatch, dispatch_wakeup_cb, vo);
pthread_mutex_init(&vo->in->lock, NULL);
pthread_cond_init(&vo->in->wakeup, NULL);
mp_input_set_mouse_transform(vo->input_ctx, NULL, NULL);
if (vo->driver->encode != !!vo->encode_lavc_ctx)
goto error;
struct m_config *config = m_config_from_obj_desc(vo, vo->log, &desc);
if (m_config_apply_defaults(config, name, vo->opts->vo_defs) < 0)
goto error;
if (m_config_set_obj_params(config, args) < 0)
goto error;
vo->priv = config->optstruct;
if (pthread_create(&vo->in->thread, NULL, vo_thread, vo))
goto error;
if (mp_rendezvous(vo, 0) < 0) { // init barrier
pthread_join(vo->in->thread, NULL);
goto error;
}
return vo;
error:
dealloc_vo(vo);
return NULL;
}
struct vo *init_best_video_out(struct mpv_global *global,
struct input_ctx *input_ctx,
struct osd_state *osd,
struct encode_lavc_context *encode_lavc_ctx)
{
struct m_obj_settings *vo_list = global->opts->vo.video_driver_list;
// first try the preferred drivers, with their optional subdevice param:
if (vo_list && vo_list[0].name) {
for (int n = 0; vo_list[n].name; n++) {
// Something like "-vo name," allows fallback to autoprobing.
if (strlen(vo_list[n].name) == 0)
goto autoprobe;
struct vo *vo = vo_create(global, input_ctx, osd, encode_lavc_ctx,
vo_list[n].name, vo_list[n].attribs);
if (vo)
return vo;
}
return NULL;
}
autoprobe:
// now try the rest...
for (int i = 0; video_out_drivers[i]; i++) {
struct vo *vo = vo_create(global, input_ctx, osd, encode_lavc_ctx,
(char *)video_out_drivers[i]->name, NULL);
if (vo)
return vo;
}
return NULL;
}
void vo_destroy(struct vo *vo)
{
struct vo_internal *in = vo->in;
mp_dispatch_lock(in->dispatch);
vo->in->terminate = true;
mp_dispatch_unlock(in->dispatch);
pthread_join(vo->in->thread, NULL);
dealloc_vo(vo);
}
// to be called from VO thread only
static void update_display_fps(struct vo *vo)
{
double display_fps = 1000.0; // assume infinite if unset
if (vo->global->opts->frame_drop_fps > 0) {
display_fps = vo->global->opts->frame_drop_fps;
} else {
vo->driver->control(vo, VOCTRL_GET_DISPLAY_FPS, &display_fps);
}
int64_t n_interval = MPMAX((int64_t)(1e6 / display_fps), 1);
if (vo->in->vsync_interval != n_interval)
MP_VERBOSE(vo, "Assuming %f FPS for framedrop.\n", display_fps);
vo->in->vsync_interval = n_interval;
}
static void check_vo_caps(struct vo *vo)
{
int rot = vo->params->rotate;
if (rot) {
bool ok = rot % 90 ? false : (vo->driver->caps & VO_CAP_ROTATE90);
if (!ok) {
MP_WARN(vo, "Video is flagged as rotated by %d degrees, but the "
"video output does not support this.\n", rot);
}
}
}
static void run_reconfig(void *p)
{
void **pp = p;
struct vo *vo = pp[0];
struct mp_image_params *params = pp[1];
int flags = *(int *)pp[2];
int *ret = pp[3];
vo->dwidth = params->d_w;
vo->dheight = params->d_h;
talloc_free(vo->params);
vo->params = talloc_memdup(vo, params, sizeof(*params));
*ret = vo->driver->reconfig(vo, vo->params, flags);
vo->config_ok = *ret >= 0;
if (vo->config_ok) {
check_vo_caps(vo);
} else {
talloc_free(vo->params);
vo->params = NULL;
}
forget_frames(vo); // implicitly synchronized
update_display_fps(vo);
}
int vo_reconfig(struct vo *vo, struct mp_image_params *params, int flags)
{
int ret;
void *p[] = {vo, params, &flags, &ret};
mp_dispatch_run(vo->in->dispatch, run_reconfig, p);
return ret;
}
static void run_control(void *p)
{
void **pp = p;
struct vo *vo = pp[0];
uint32_t request = *(int *)pp[1];
void *data = pp[2];
if (request == VOCTRL_UPDATE_WINDOW_TITLE) // legacy fallback
vo->in->window_title = talloc_strdup(vo, data);
int ret = vo->driver->control(vo, request, data);
*(int *)pp[3] = ret;
}
int vo_control(struct vo *vo, uint32_t request, void *data)
{
int ret;
void *p[] = {vo, &request, data, &ret};
mp_dispatch_run(vo->in->dispatch, run_control, p);
return ret;
}
// must be called locked
static void forget_frames(struct vo *vo)
{
struct vo_internal *in = vo->in;
in->hasframe = false;
in->hasframe_rendered = false;
in->drop_count = 0;
mp_image_unrefp(&in->frame_queued);
mp_image_unrefp(&in->dropped_image);
}
#ifndef __MINGW32__
static void wait_event_fd(struct vo *vo, int64_t until_time)
{
struct vo_internal *in = vo->in;
struct pollfd fds[2] = {
{ .fd = vo->event_fd, .events = POLLIN },
{ .fd = in->wakeup_pipe[0], .events = POLLIN },
};
int64_t wait_us = until_time - mp_time_us();
int timeout_ms = MPCLAMP((wait_us + 500) / 1000, 0, 10000);
poll(fds, 2, timeout_ms);
if (fds[1].revents & POLLIN) {
char buf[100];
read(in->wakeup_pipe[0], buf, sizeof(buf)); // flush
}
}
static void wakeup_event_fd(struct vo *vo)
{
struct vo_internal *in = vo->in;
write(in->wakeup_pipe[1], &(char){0}, 1);
}
#else
static void wait_event_fd(struct vo *vo, int64_t until_time){}
static void wakeup_event_fd(struct vo *vo){}
#endif
// Called unlocked.
static void wait_vo(struct vo *vo, int64_t until_time)
{
struct vo_internal *in = vo->in;
if (vo->event_fd >= 0) {
wait_event_fd(vo, until_time);
pthread_mutex_lock(&in->lock);
in->need_wakeup = false;
pthread_mutex_unlock(&in->lock);
} else if (vo->driver->wait_events) {
vo->driver->wait_events(vo, until_time);
pthread_mutex_lock(&in->lock);
in->need_wakeup = false;
pthread_mutex_unlock(&in->lock);
} else {
pthread_mutex_lock(&in->lock);
if (!in->need_wakeup)
mpthread_cond_timedwait(&in->wakeup, &in->lock, until_time);
in->need_wakeup = false;
pthread_mutex_unlock(&in->lock);
}
}
static void wakeup_locked(struct vo *vo)
{
struct vo_internal *in = vo->in;
pthread_cond_signal(&in->wakeup);
if (vo->event_fd >= 0)
wakeup_event_fd(vo);
if (vo->driver->wakeup)
vo->driver->wakeup(vo);
in->need_wakeup = true;
}
// Wakeup VO thread, and make it check for new events with VOCTRL_CHECK_EVENTS.
// To be used by threaded VO backends.
void vo_wakeup(struct vo *vo)
{
struct vo_internal *in = vo->in;
pthread_mutex_lock(&in->lock);
wakeup_locked(vo);
pthread_mutex_unlock(&in->lock);
}
// Whether vo_queue_frame() can be called. If the VO is not ready yet, the
// function will return false, and the VO will call the wakeup callback once
// it's ready.
// next_pts is the exact time when the next frame should be displayed. If the
// VO is ready, but the time is too "early", return false, and call the wakeup
// callback once the time is right.
bool vo_is_ready_for_frame(struct vo *vo, int64_t next_pts)
{
struct vo_internal *in = vo->in;
pthread_mutex_lock(&in->lock);
bool r = vo->config_ok && !in->frame_queued;
if (r) {
// Don't show the frame too early - it would basically freeze the
// display by disallowing OSD redrawing or VO interaction.
// Actually render the frame at earliest 50ms before target time.
next_pts -= 0.050 * 1e6;
next_pts -= in->flip_queue_offset;
int64_t now = mp_time_us();
if (next_pts > now)
r = false;
if (!in->wakeup_pts || next_pts < in->wakeup_pts) {
in->wakeup_pts = next_pts;
wakeup_locked(vo);
}
}
pthread_mutex_unlock(&in->lock);
return r;
}
// Direct the VO thread to put the currently queued image on the screen.
// vo_is_ready_for_frame() must have returned true before this call.
// Ownership of the image is handed to the vo.
void vo_queue_frame(struct vo *vo, struct mp_image *image,
int64_t pts_us, int64_t duration)
{
struct vo_internal *in = vo->in;
pthread_mutex_lock(&in->lock);
assert(vo->config_ok && !in->frame_queued);
in->hasframe = true;
in->frame_queued = image;
in->frame_pts = pts_us;
in->frame_duration = duration;
in->wakeup_pts = in->frame_pts + MPMAX(duration, 0);
wakeup_locked(vo);
pthread_mutex_unlock(&in->lock);
}
// If a frame is currently being rendered (or queued), wait until it's done.
// Otherwise, return immediately.
void vo_wait_frame(struct vo *vo)
{
struct vo_internal *in = vo->in;
pthread_mutex_lock(&in->lock);
while (in->frame_queued || in->rendering)
pthread_cond_wait(&in->wakeup, &in->lock);
pthread_mutex_unlock(&in->lock);
}
static int64_t prev_sync(struct vo *vo, int64_t ts)
{
struct vo_internal *in = vo->in;
int64_t diff = (int64_t)(ts - in->last_flip);
int64_t offset = diff % in->vsync_interval;
if (offset < 0)
offset += in->vsync_interval;
return ts - offset;
}
static bool render_frame(struct vo *vo)
{
struct vo_internal *in = vo->in;
update_display_fps(vo);
pthread_mutex_lock(&in->lock);
int64_t pts = in->frame_pts;
int64_t duration = in->frame_duration;
struct mp_image *img = in->frame_queued;
if (!img) {
pthread_mutex_unlock(&in->lock);
return false;
}
mp_image_unrefp(&in->dropped_image);
in->rendering = true;
in->frame_queued = NULL;
// The next time a flip (probably) happens.
int64_t next_vsync = prev_sync(vo, mp_time_us()) + in->vsync_interval;
int64_t end_time = pts + duration;
in->dropped_frame = duration >= 0 && end_time < next_vsync;
in->dropped_frame &= in->hasframe_rendered;
in->dropped_frame &= !!(vo->global->opts->frame_dropping & 1);
in->dropped_frame &= !(vo->driver->caps & VO_CAP_FRAMEDROP) &&
!vo->driver->untimed && !vo->driver->encode;
// Even if we're hopelessly behind, rather degrade to 10 FPS playback,
// instead of just freezing the display forever.
in->dropped_frame &= mp_time_us() - in->last_flip < 100 * 1000;
if (in->dropped_frame) {
in->drop_count += 1;
in->dropped_image = img;
} else {
in->hasframe_rendered = true;
pthread_mutex_unlock(&in->lock);
MP_STATS(vo, "start video");
vo->driver->draw_image(vo, img);
int64_t target = pts - in->flip_queue_offset;
while (1) {
int64_t now = mp_time_us();
if (target <= now)
break;
mp_sleep_us(target - now);
}
if (vo->driver->flip_page_timed)
vo->driver->flip_page_timed(vo, pts, duration);
else
vo->driver->flip_page(vo);
in->last_flip = -1;
vo->driver->control(vo, VOCTRL_GET_RECENT_FLIP_TIME, &in->last_flip);
if (in->last_flip < 0)
in->last_flip = mp_time_us();
long phase = in->last_flip % in->vsync_interval;
MP_DBG(vo, "phase: %ld\n", phase);
MP_STATS(vo, "value %ld phase", phase);
MP_STATS(vo, "end video");
pthread_mutex_lock(&in->lock);
}
vo->want_redraw = false;
in->request_redraw = false;
in->rendering = false;
pthread_cond_signal(&in->wakeup); // for vo_wait_frame()
mp_input_wakeup(vo->input_ctx);
pthread_mutex_unlock(&in->lock);
return true;
}
static void do_redraw(struct vo *vo)
{
struct vo_internal *in = vo->in;
vo->want_redraw = false;
pthread_mutex_lock(&in->lock);
in->request_redraw = false;
bool skip = !in->paused && in->dropped_frame;
struct mp_image *img = in->dropped_image;
if (!skip) {
in->dropped_image = NULL;
in->dropped_frame = false;
}
pthread_mutex_unlock(&in->lock);
if (!vo->config_ok || skip)
return;
if (img) {
vo->driver->draw_image(vo, img);
} else {
if (vo->driver->control(vo, VOCTRL_REDRAW_FRAME, NULL) < 1)
return;
}
if (vo->driver->flip_page_timed)
vo->driver->flip_page_timed(vo, 0, -1);
else
vo->driver->flip_page(vo);
}
static void *vo_thread(void *ptr)
{
struct vo *vo = ptr;
struct vo_internal *in = vo->in;
int r = vo->driver->preinit(vo) ? -1 : 0;
mp_rendezvous(vo, r); // init barrier
if (r < 0)
return NULL;
while (1) {
mp_dispatch_queue_process(vo->in->dispatch, 0);
if (in->terminate)
break;
vo->driver->control(vo, VOCTRL_CHECK_EVENTS, NULL);
bool frame_shown = render_frame(vo);
int64_t now = mp_time_us();
int64_t wait_until = now + (frame_shown ? 0 : (int64_t)1e9);
pthread_mutex_lock(&in->lock);
if (in->wakeup_pts) {
if (in->wakeup_pts > now) {
wait_until = MPMIN(wait_until, in->wakeup_pts);
} else {
in->wakeup_pts = 0;
mp_input_wakeup(vo->input_ctx);
}
}
vo->want_redraw |= in->request_redraw;
pthread_mutex_unlock(&in->lock);
if (wait_until > now && vo->want_redraw) {
do_redraw(vo); // now is a good time
continue;
}
wait_vo(vo, wait_until);
}
forget_frames(vo); // implicitly synchronized
vo->driver->uninit(vo);
return NULL;
}
void vo_set_paused(struct vo *vo, bool paused)
{
struct vo_internal *in = vo->in;
pthread_mutex_lock(&in->lock);
if (in->paused != paused) {
in->paused = true;
if (in->paused && in->dropped_frame)
in->request_redraw = true;
}
pthread_mutex_unlock(&in->lock);
vo_control(vo, paused ? VOCTRL_PAUSE : VOCTRL_RESUME, NULL);
}
int64_t vo_get_drop_count(struct vo *vo)
{
pthread_mutex_lock(&vo->in->lock);
int64_t r = vo->in->drop_count;
pthread_mutex_unlock(&vo->in->lock);
return r;
}
// Make the VO redraw the OSD at some point in the future.
void vo_redraw(struct vo *vo)
{
struct vo_internal *in = vo->in;
pthread_mutex_lock(&in->lock);
if (!in->request_redraw) {
in->request_redraw = true;
wakeup_locked(vo);
}
pthread_mutex_unlock(&in->lock);
}
void vo_seek_reset(struct vo *vo)
{
pthread_mutex_lock(&vo->in->lock);
forget_frames(vo);
pthread_mutex_unlock(&vo->in->lock);
vo_control(vo, VOCTRL_RESET, NULL);
}
// Return true if there is still a frame being displayed (or queued).
// If this returns true, a wakeup some time in the future is guaranteed.
bool vo_still_displaying(struct vo *vo)
{
struct vo_internal *in = vo->in;
pthread_mutex_lock(&vo->in->lock);
int64_t now = mp_time_us();
int64_t frame_end = in->frame_pts + MPMAX(in->frame_duration, 0);
bool working = now < frame_end || in->rendering || in->frame_queued;
pthread_mutex_unlock(&vo->in->lock);
return working && in->hasframe;
}
// Whether at least 1 frame was queued or rendered since last seek or reconfig.
bool vo_has_frame(struct vo *vo)
{
return vo->in->hasframe;
}
static void run_query_format(void *p)
{
void **pp = p;
struct vo *vo = pp[0];
*(int *)pp[2] = vo->driver->query_format(vo, *(int *)pp[1]);
}
int vo_query_format(struct vo *vo, int format)
{
int ret;
void *p[] = {vo, &format, &ret};
mp_dispatch_run(vo->in->dispatch, run_query_format, p);
return ret;
}
// Calculate the appropriate source and destination rectangle to
// get a correctly scaled picture, including pan-scan.
// out_src: visible part of the video
// out_dst: area of screen covered by the video source rectangle
// out_osd: OSD size, OSD margins, etc.
// Must be called from the VO thread only.
void vo_get_src_dst_rects(struct vo *vo, struct mp_rect *out_src,
struct mp_rect *out_dst, struct mp_osd_res *out_osd)
{
if (!vo->params) {
*out_src = *out_dst = (struct mp_rect){0};
*out_osd = (struct mp_osd_res){0};
return;
}
mp_get_src_dst_rects(vo->log, vo->opts, vo->driver->caps, vo->params,
vo->dwidth, vo->dheight, vo->monitor_par,
out_src, out_dst, out_osd);
}
// Return the window title the VO should set. Always returns a null terminated
// string. The string is valid until frontend code is invoked again. Copy it if
// you need to keep the string for an extended period of time.
// Must be called from the VO thread only.
// Don't use for new code.
const char *vo_get_window_title(struct vo *vo)
{
if (!vo->in->window_title)
vo->in->window_title = talloc_strdup(vo, "");
return vo->in->window_title;
}
// flip_page[_timed] will be called this many microseconds too early.
// (For vo_vdpau, which does its own timing.)
void vo_set_flip_queue_offset(struct vo *vo, int64_t us)
{
struct vo_internal *in = vo->in;
pthread_mutex_lock(&in->lock);
in->flip_queue_offset = us;
pthread_mutex_unlock(&in->lock);
}
int64_t vo_get_vsync_interval(struct vo *vo)
{
return vo->in->vsync_interval;
}
/**
* \brief lookup an integer in a table, table must have 0 as the last key
* \param key key to search for
* \result translation corresponding to key or "to" value of last mapping
* if not found.
*/
int lookup_keymap_table(const struct mp_keymap *map, int key)
{
while (map->from && map->from != key)
map++;
return map->to;
}
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