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mpv/video/out/vo_x11.c
Dudemanguy 91c1b65de0 vo: change draw_frame API to a boolean 
x11 and wayland VOs + backends all have logic that skips drawing frames
when the mpv isn't visible for efficiency reasons. This is implemented
in each individual VO, but it is useful for the core to be aware of this
as well. Currently, the display-sync modes on x11 do not try to be
efficient and always render anyways because there is no blocking on the
graphics API level if you skip rendering a frame (wayland works here by
accident). This means mpv would otherwise blaze through frames which is
not what anyone wants. We can instead improve this by implementing the
blocking mechanism in the core and using that when appropriate. This
commit does not implement that yet, but simply switches the draw_frame
to a boolean. Receiving false means that the VO is not drawing frames
and it should be treated as if the surface was hidden.
2024-12-28 16:51:28 +00:00

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/*
* Original author: Aaron Holtzman <aholtzma@ess.engr.uvic.ca>
*
* This file is part of mpv.
*
* mpv 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.
*
* 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with mpv. If not, see <http://www.gnu.org/licenses/>.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <libswscale/swscale.h>
#include "vo.h"
#include "video/csputils.h"
#include "video/mp_image.h"
#include <X11/Xlib.h>
#include <X11/Xutil.h>
#include <errno.h>
#include "present_sync.h"
#include "x11_common.h"
#include <sys/ipc.h>
#include <sys/shm.h>
#include <X11/extensions/XShm.h>
#include "sub/osd.h"
#include "sub/draw_bmp.h"
#include "video/sws_utils.h"
#include "video/fmt-conversion.h"
#include "common/msg.h"
#include "input/input.h"
#include "options/options.h"
#include "osdep/timer.h"
struct priv {
struct vo *vo;
struct mp_image *original_image;
XImage *myximage[2];
struct mp_image mp_ximages[2];
int depth;
GC gc;
uint32_t image_width;
uint32_t image_height;
struct mp_rect src;
struct mp_rect dst;
struct mp_osd_res osd;
struct mp_sws_context *sws;
XVisualInfo vinfo;
int current_buf;
int Shmem_Flag;
XShmSegmentInfo Shminfo[2];
int Shm_Warned_Slow;
};
static bool resize(struct vo *vo);
static bool getMyXImage(struct priv *p, int foo)
{
struct vo *vo = p->vo;
if (vo->x11->display_is_local && XShmQueryExtension(vo->x11->display)) {
p->Shmem_Flag = 1;
vo->x11->ShmCompletionEvent = XShmGetEventBase(vo->x11->display)
+ ShmCompletion;
} else {
p->Shmem_Flag = 0;
MP_WARN(vo, "Shared memory not supported\nReverting to normal Xlib\n");
}
if (p->Shmem_Flag) {
p->myximage[foo] =
XShmCreateImage(vo->x11->display, p->vinfo.visual, p->depth,
ZPixmap, NULL, &p->Shminfo[foo], p->image_width,
p->image_height);
if (p->myximage[foo] == NULL) {
MP_WARN(vo, "Shared memory error,disabling ( Ximage error )\n");
goto shmemerror;
}
p->Shminfo[foo].shmid = shmget(IPC_PRIVATE,
p->myximage[foo]->bytes_per_line *
p->myximage[foo]->height,
IPC_CREAT | 0777);
if (p->Shminfo[foo].shmid < 0) {
XDestroyImage(p->myximage[foo]);
MP_WARN(vo, "Shared memory error,disabling ( seg id error )\n");
goto shmemerror;
}
p->Shminfo[foo].shmaddr = (char *) shmat(p->Shminfo[foo].shmid, 0, 0);
if (p->Shminfo[foo].shmaddr == ((char *) -1)) {
XDestroyImage(p->myximage[foo]);
MP_WARN(vo, "Shared memory error,disabling ( address error )\n");
goto shmemerror;
}
p->myximage[foo]->data = p->Shminfo[foo].shmaddr;
p->Shminfo[foo].readOnly = False;
XShmAttach(vo->x11->display, &p->Shminfo[foo]);
XSync(vo->x11->display, False);
shmctl(p->Shminfo[foo].shmid, IPC_RMID, 0);
} else {
shmemerror:
p->Shmem_Flag = 0;
MP_VERBOSE(vo, "Not using SHM.\n");
p->myximage[foo] =
XCreateImage(vo->x11->display, p->vinfo.visual, p->depth, ZPixmap,
0, NULL, p->image_width, p->image_height, 8, 0);
if (p->myximage[foo]) {
p->myximage[foo]->data =
calloc(1, p->myximage[foo]->bytes_per_line * p->image_height + 32);
}
if (!p->myximage[foo] || !p->myximage[foo]->data) {
MP_WARN(vo, "could not allocate image");
return false;
}
}
return true;
}
static void freeMyXImage(struct priv *p, int foo)
{
struct vo *vo = p->vo;
if (p->Shmem_Flag) {
XShmDetach(vo->x11->display, &p->Shminfo[foo]);
XDestroyImage(p->myximage[foo]);
shmdt(p->Shminfo[foo].shmaddr);
} else {
if (p->myximage[foo]) {
// XDestroyImage() would free the data too since XFree() just calls
// free(), but do it ourselves for portability reasons
free(p->myximage[foo]->data);
p->myximage[foo]->data = NULL;
XDestroyImage(p->myximage[foo]);
}
}
p->myximage[foo] = NULL;
}
#define MAKE_MASK(comp) (((1ul << (comp).size) - 1) << (comp).offset)
static int reconfig(struct vo *vo, struct mp_image_params *fmt)
{
vo_x11_config_vo_window(vo);
if (!resize(vo))
return -1;
return 0;
}
static bool resize(struct vo *vo)
{
struct priv *p = vo->priv;
// Attempt to align. We don't know the size in bytes yet (????), so just
// assume worst case (1 byte per pixel).
int nw = MPMAX(1, MP_ALIGN_UP(vo->dwidth, MP_IMAGE_BYTE_ALIGN));
int nh = MPMAX(1, vo->dheight);
if (nw > p->image_width || nh > p->image_height) {
for (int i = 0; i < 2; i++)
freeMyXImage(p, i);
p->image_width = nw;
p->image_height = nh;
for (int i = 0; i < 2; i++) {
if (!getMyXImage(p, i)) {
p->image_width = 0;
p->image_height = 0;
return false;
}
}
}
int mpfmt = 0;
for (int fmt = IMGFMT_START; fmt < IMGFMT_END; fmt++) {
struct mp_imgfmt_desc desc = mp_imgfmt_get_desc(fmt);
if ((desc.flags & MP_IMGFLAG_HAS_COMPS) && desc.num_planes == 1 &&
(desc.flags & MP_IMGFLAG_COLOR_MASK) == MP_IMGFLAG_COLOR_RGB &&
(desc.flags & MP_IMGFLAG_TYPE_MASK) == MP_IMGFLAG_TYPE_UINT &&
(desc.flags & MP_IMGFLAG_NE) && !(desc.flags & MP_IMGFLAG_ALPHA) &&
desc.bpp[0] <= 8 * sizeof(unsigned long) &&
p->myximage[0]->bits_per_pixel == desc.bpp[0] &&
p->myximage[0]->byte_order == MP_SELECT_LE_BE(LSBFirst, MSBFirst))
{
// desc.comps[] uses little endian bit offsets, so "swap" the
// offsets here.
if (MP_SELECT_LE_BE(0, 1)) {
// Except for formats that use byte swapping; for these, the
// offsets are in native endian. There is no way to distinguish
// which one a given format is (could even be both), and using
// mp_find_other_endian() is just a guess.
if (!mp_find_other_endian(fmt)) {
for (int c = 0; c < 3; c++) {
desc.comps[c].offset =
desc.bpp[0] - desc.comps[c].size -desc.comps[c].offset;
}
}
}
if (p->myximage[0]->red_mask == MAKE_MASK(desc.comps[0]) &&
p->myximage[0]->green_mask == MAKE_MASK(desc.comps[1]) &&
p->myximage[0]->blue_mask == MAKE_MASK(desc.comps[2]))
{
mpfmt = fmt;
break;
}
}
}
if (!mpfmt) {
MP_ERR(vo, "X server image format not supported, use another VO.\n");
return false;
}
MP_VERBOSE(vo, "Using mp format: %s\n", mp_imgfmt_to_name(mpfmt));
for (int i = 0; i < 2; i++) {
struct mp_image *img = &p->mp_ximages[i];
*img = (struct mp_image){0};
mp_image_setfmt(img, mpfmt);
mp_image_set_size(img, p->image_width, p->image_height);
img->planes[0] = p->myximage[i]->data;
img->stride[0] = p->myximage[i]->bytes_per_line;
mp_image_params_guess_csp(&img->params);
}
vo_get_src_dst_rects(vo, &p->src, &p->dst, &p->osd);
if (vo->params) {
p->sws->src = *vo->params;
p->sws->src.w = mp_rect_w(p->src);
p->sws->src.h = mp_rect_h(p->src);
p->sws->dst = p->mp_ximages[0].params;
p->sws->dst.w = mp_rect_w(p->dst);
p->sws->dst.h = mp_rect_h(p->dst);
if (mp_sws_reinit(p->sws) < 0)
return false;
mp_mutex_lock(&vo->params_mutex);
vo->target_params = &p->sws->dst;
mp_mutex_unlock(&vo->params_mutex);
}
vo->want_redraw = true;
return true;
}
static void Display_Image(struct priv *p, XImage *myximage)
{
struct vo *vo = p->vo;
XImage *x_image = p->myximage[p->current_buf];
if (p->Shmem_Flag) {
XShmPutImage(vo->x11->display, vo->x11->window, p->gc, x_image,
0, 0, 0, 0, vo->dwidth, vo->dheight, True);
vo->x11->ShmCompletionWaitCount++;
} else {
XPutImage(vo->x11->display, vo->x11->window, p->gc, x_image,
0, 0, 0, 0, vo->dwidth, vo->dheight);
}
}
static void wait_for_completion(struct vo *vo, int max_outstanding)
{
struct priv *ctx = vo->priv;
struct vo_x11_state *x11 = vo->x11;
if (ctx->Shmem_Flag) {
while (x11->ShmCompletionWaitCount > max_outstanding) {
if (!ctx->Shm_Warned_Slow) {
MP_WARN(vo, "can't keep up! Waiting"
" for XShm completion events...\n");
ctx->Shm_Warned_Slow = 1;
}
mp_sleep_ns(MP_TIME_MS_TO_NS(1));
vo_x11_check_events(vo);
}
}
}
static void flip_page(struct vo *vo)
{
struct priv *p = vo->priv;
Display_Image(p, p->myximage[p->current_buf]);
p->current_buf = (p->current_buf + 1) % 2;
if (vo->x11->use_present) {
vo_x11_present(vo);
present_sync_swap(vo->x11->present);
}
}
static void get_vsync(struct vo *vo, struct vo_vsync_info *info)
{
struct vo_x11_state *x11 = vo->x11;
if (x11->use_present)
present_sync_get_info(x11->present, info);
}
static bool draw_frame(struct vo *vo, struct vo_frame *frame)
{
struct priv *p = vo->priv;
wait_for_completion(vo, 1);
bool render = vo_x11_check_visible(vo);
if (!render)
return VO_FALSE;
struct mp_image *img = &p->mp_ximages[p->current_buf];
if (frame->current) {
mp_image_clear_rc_inv(img, p->dst);
struct mp_image *src = frame->current;
struct mp_rect src_rc = p->src;
src_rc.x0 = MP_ALIGN_DOWN(src_rc.x0, src->fmt.align_x);
src_rc.y0 = MP_ALIGN_DOWN(src_rc.y0, src->fmt.align_y);
mp_image_crop_rc(src, src_rc);
struct mp_image dst = *img;
mp_image_crop_rc(&dst, p->dst);
mp_sws_scale(p->sws, &dst, src);
} else {
mp_image_clear(img, 0, 0, img->w, img->h);
}
osd_draw_on_image(vo->osd, p->osd, frame->current ? frame->current->pts : 0, 0, img);
if (frame->current != p->original_image)
p->original_image = frame->current;
return VO_TRUE;
}
static int query_format(struct vo *vo, int format)
{
struct priv *p = vo->priv;
if (mp_sws_supports_formats(p->sws, IMGFMT_RGB0, format))
return 1;
return 0;
}
static void uninit(struct vo *vo)
{
struct priv *p = vo->priv;
if (p->myximage[0])
freeMyXImage(p, 0);
if (p->myximage[1])
freeMyXImage(p, 1);
if (p->gc)
XFreeGC(vo->x11->display, p->gc);
vo_x11_uninit(vo);
}
static int preinit(struct vo *vo)
{
struct priv *p = vo->priv;
p->vo = vo;
p->sws = mp_sws_alloc(vo);
p->sws->log = vo->log;
mp_sws_enable_cmdline_opts(p->sws, vo->global);
if (!vo_x11_init(vo))
goto error;
struct vo_x11_state *x11 = vo->x11;
XWindowAttributes attribs;
XGetWindowAttributes(x11->display, x11->rootwin, &attribs);
p->depth = attribs.depth;
if (!XMatchVisualInfo(x11->display, x11->screen, p->depth,
TrueColor, &p->vinfo))
goto error;
MP_VERBOSE(vo, "selected visual: %d\n", (int)p->vinfo.visualid);
if (!vo_x11_create_vo_window(vo, &p->vinfo, "x11"))
goto error;
p->gc = XCreateGC(x11->display, x11->window, 0, NULL);
MP_WARN(vo, "Warning: this legacy VO has bad performance. Consider fixing "
"your graphics drivers, or not forcing the x11 VO.\n");
return 0;
error:
uninit(vo);
return -1;
}
static int control(struct vo *vo, uint32_t request, void *data)
{
switch (request) {
case VOCTRL_SET_PANSCAN:
if (vo->config_ok)
resize(vo);
return VO_TRUE;
}
int events = 0;
int r = vo_x11_control(vo, &events, request, data);
if (vo->config_ok && (events & (VO_EVENT_EXPOSE | VO_EVENT_RESIZE)))
resize(vo);
vo_event(vo, events);
return r;
}
const struct vo_driver video_out_x11 = {
.description = "X11 (software scaling)",
.name = "x11",
.priv_size = sizeof(struct priv),
.preinit = preinit,
.query_format = query_format,
.reconfig = reconfig,
.control = control,
.draw_frame = draw_frame,
.flip_page = flip_page,
.get_vsync = get_vsync,
.wakeup = vo_x11_wakeup,
.wait_events = vo_x11_wait_events,
.uninit = uninit,
};
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