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mpv/video/out/vo_drm.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 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/>.
*
* You can alternatively redistribute this file 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.
*/
#include <assert.h>
#include <errno.h>
#include <fcntl.h>
#include <stdbool.h>
#include <sys/mman.h>
#include <sys/poll.h>
#include <unistd.h>
#include <libswscale/swscale.h>
#include <xf86drm.h>
#include <xf86drmMode.h>
#include "drm_common.h"
#include "common/msg.h"
#include "osdep/timer.h"
#include "sub/osd.h"
#include "video/fmt-conversion.h"
#include "video/mp_image.h"
#include "video/sws_utils.h"
#include "vo.h"
#define IMGFMT IMGFMT_BGR0
#define BYTES_PER_PIXEL 4
#define BITS_PER_PIXEL 32
#define USE_MASTER 0
#define BUF_COUNT 2
struct framebuffer {
uint32_t width;
uint32_t height;
uint32_t stride;
uint32_t size;
uint32_t handle;
uint8_t *map;
uint32_t fb;
};
struct priv {
char *device_path;
int connector_id;
int mode_id;
struct kms *kms;
drmModeCrtc *old_crtc;
drmEventContext ev;
bool vt_switcher_active;
struct vt_switcher vt_switcher;
struct framebuffer bufs[BUF_COUNT];
int front_buf;
bool active;
bool pflip_happening;
int32_t device_w;
int32_t device_h;
struct mp_image *last_input;
struct mp_image *cur_frame;
struct mp_rect src;
struct mp_rect dst;
struct mp_osd_res osd;
struct mp_sws_context *sws;
};
static void fb_destroy(int fd, struct framebuffer *buf)
{
if (buf->map) {
munmap(buf->map, buf->size);
}
if (buf->fb) {
drmModeRmFB(fd, buf->fb);
}
if (buf->handle) {
struct drm_mode_destroy_dumb dreq = {
.handle = buf->handle,
};
drmIoctl(fd, DRM_IOCTL_MODE_DESTROY_DUMB, &dreq);
}
}
static bool fb_setup_single(struct vo *vo, int fd, struct framebuffer *buf)
{
buf->handle = 0;
// create dumb buffer
struct drm_mode_create_dumb creq = {
.width = buf->width,
.height = buf->height,
.bpp = BITS_PER_PIXEL,
};
if (drmIoctl(fd, DRM_IOCTL_MODE_CREATE_DUMB, &creq) < 0) {
MP_ERR(vo, "Cannot create dumb buffer: %s\n", mp_strerror(errno));
goto err;
}
buf->stride = creq.pitch;
buf->size = creq.size;
buf->handle = creq.handle;
// create framebuffer object for the dumb-buffer
if (drmModeAddFB(fd, buf->width, buf->height, 24, creq.bpp, buf->stride,
buf->handle, &buf->fb)) {
MP_ERR(vo, "Cannot create framebuffer: %s\n", mp_strerror(errno));
goto err;
}
// prepare buffer for memory mapping
struct drm_mode_map_dumb mreq = {
.handle = buf->handle,
};
if (drmIoctl(fd, DRM_IOCTL_MODE_MAP_DUMB, &mreq)) {
MP_ERR(vo, "Cannot map dumb buffer: %s\n", mp_strerror(errno));
goto err;
}
// perform actual memory mapping
buf->map = mmap(0, buf->size, PROT_READ | PROT_WRITE, MAP_SHARED,
fd, mreq.offset);
if (buf->map == MAP_FAILED) {
MP_ERR(vo, "Cannot map dumb buffer: %s\n", mp_strerror(errno));
goto err;
}
memset(buf->map, 0, buf->size);
return true;
err:
fb_destroy(fd, buf);
return false;
}
static bool fb_setup_double_buffering(struct vo *vo)
{
struct priv *p = vo->priv;
p->front_buf = 0;
for (unsigned int i = 0; i < 2; i++) {
p->bufs[i].width = p->kms->mode.hdisplay;
p->bufs[i].height = p->kms->mode.vdisplay;
}
for (unsigned int i = 0; i < BUF_COUNT; i++) {
if (!fb_setup_single(vo, p->kms->fd, &p->bufs[i])) {
MP_ERR(vo, "Cannot create framebuffer for connector %d\n",
p->kms->connector->connector_id);
for (unsigned int j = 0; j < i; j++) {
fb_destroy(p->kms->fd, &p->bufs[j]);
}
return false;
}
}
return true;
}
static void page_flipped(int fd, unsigned int frame, unsigned int sec,
unsigned int usec, void *data)
{
struct priv *p = data;
p->pflip_happening = false;
}
static bool crtc_setup(struct vo *vo)
{
struct priv *p = vo->priv;
if (p->active)
return true;
p->old_crtc = drmModeGetCrtc(p->kms->fd, p->kms->crtc_id);
int ret = drmModeSetCrtc(p->kms->fd, p->kms->crtc_id,
p->bufs[p->front_buf + BUF_COUNT - 1].fb,
0,
0,
&p->kms->connector->connector_id,
1,
&p->kms->mode);
p->active = true;
return ret == 0;
}
static void crtc_release(struct vo *vo)
{
struct priv *p = vo->priv;
if (!p->active)
return;
p->active = false;
// wait for current page flip
while (p->pflip_happening) {
int ret = drmHandleEvent(p->kms->fd, &p->ev);
if (ret) {
MP_ERR(vo, "drmHandleEvent failed: %i\n", ret);
break;
}
}
if (p->old_crtc) {
drmModeSetCrtc(p->kms->fd,
p->old_crtc->crtc_id,
p->old_crtc->buffer_id,
p->old_crtc->x,
p->old_crtc->y,
&p->kms->connector->connector_id,
1,
&p->old_crtc->mode);
drmModeFreeCrtc(p->old_crtc);
p->old_crtc = NULL;
}
}
static void release_vt(void *data)
{
struct vo *vo = data;
crtc_release(vo);
if (USE_MASTER) {
//this function enables support for switching to x, weston etc.
//however, for whatever reason, it can be called only by root users.
//until things change, this is commented.
struct priv *p = vo->priv;
if (drmDropMaster(p->kms->fd)) {
MP_WARN(vo, "Failed to drop DRM master: %s\n", mp_strerror(errno));
}
}
}
static void acquire_vt(void *data)
{
struct vo *vo = data;
if (USE_MASTER) {
struct priv *p = vo->priv;
if (drmSetMaster(p->kms->fd)) {
MP_WARN(vo, "Failed to acquire DRM master: %s\n", mp_strerror(errno));
}
}
crtc_setup(vo);
}
static int wait_events(struct vo *vo, int64_t until_time_us)
{
struct priv *p = vo->priv;
if (p->vt_switcher_active) {
int64_t wait_us = until_time_us - mp_time_us();
int timeout_ms = MPCLAMP((wait_us + 500) / 1000, 0, 10000);
vt_switcher_poll(&p->vt_switcher, timeout_ms);
}
return 0;
}
static void wakeup(struct vo *vo)
{
struct priv *p = vo->priv;
if (p->vt_switcher_active)
vt_switcher_interrupt_poll(&p->vt_switcher);
}
static int reconfig(struct vo *vo, struct mp_image_params *params)
{
struct priv *p = vo->priv;
vo->dwidth = p->device_w;
vo->dheight = p->device_h;
vo_get_src_dst_rects(vo, &p->src, &p->dst, &p->osd);
int w = p->dst.x1 - p->dst.x0;
int h = p->dst.y1 - p->dst.y0;
// p->osd contains the parameters assuming OSD rendering in window
// coordinates, but OSD can only be rendered in the intersection
// between window and video rectangle (i.e. not into panscan borders).
p->osd.w = w;
p->osd.h = h;
p->osd.mt = MPMIN(0, p->osd.mt);
p->osd.mb = MPMIN(0, p->osd.mb);
p->osd.mr = MPMIN(0, p->osd.mr);
p->osd.ml = MPMIN(0, p->osd.ml);
mp_sws_set_from_cmdline(p->sws, vo->opts->sws_opts);
p->sws->src = *params;
p->sws->dst = (struct mp_image_params) {
.imgfmt = IMGFMT,
.w = w,
.h = h,
.p_w = 1,
.p_h = 1,
};
talloc_free(p->cur_frame);
p->cur_frame = mp_image_alloc(IMGFMT, p->device_w, p->device_h);
mp_image_params_guess_csp(&p->sws->dst);
mp_image_set_params(p->cur_frame, &p->sws->dst);
struct framebuffer *buf = p->bufs;
for (unsigned int i = 0; i < BUF_COUNT; i++)
memset(buf[i].map, 0, buf[i].size);
if (mp_sws_reinit(p->sws) < 0)
return -1;
vo->want_redraw = true;
return 0;
}
static void draw_image(struct vo *vo, mp_image_t *mpi)
{
struct priv *p = vo->priv;
if (p->active) {
if (mpi) {
struct mp_image src = *mpi;
struct mp_rect src_rc = p->src;
src_rc.x0 = MP_ALIGN_DOWN(src_rc.x0, mpi->fmt.align_x);
src_rc.y0 = MP_ALIGN_DOWN(src_rc.y0, mpi->fmt.align_y);
mp_image_crop_rc(&src, src_rc);
mp_sws_scale(p->sws, p->cur_frame, &src);
osd_draw_on_image(vo->osd, p->osd, src.pts, 0, p->cur_frame);
} else {
mp_image_clear(p->cur_frame, 0, 0, p->cur_frame->w, p->cur_frame->h);
osd_draw_on_image(vo->osd, p->osd, 0, 0, p->cur_frame);
}
struct framebuffer *front_buf = &p->bufs[p->front_buf];
int w = p->dst.x1 - p->dst.x0;
int h = p->dst.y1 - p->dst.y0;
int x = (p->device_w - w) >> 1;
int y = (p->device_h - h) >> 1;
int shift = y * front_buf->stride + x * BYTES_PER_PIXEL;
memcpy_pic(front_buf->map + shift,
p->cur_frame->planes[0],
w * BYTES_PER_PIXEL,
h,
front_buf->stride,
p->cur_frame->stride[0]);
}
if (mpi != p->last_input) {
talloc_free(p->last_input);
p->last_input = mpi;
}
}
static void flip_page(struct vo *vo)
{
struct priv *p = vo->priv;
if (!p->active || p->pflip_happening)
return;
int ret = drmModePageFlip(p->kms->fd, p->kms->crtc_id,
p->bufs[p->front_buf].fb,
DRM_MODE_PAGE_FLIP_EVENT, p);
if (ret) {
MP_WARN(vo, "Cannot flip page for connector\n");
} else {
p->front_buf++;
p->front_buf %= BUF_COUNT;
p->pflip_happening = true;
}
// poll page flip finish event
const int timeout_ms = 3000;
struct pollfd fds[1] = {
{ .events = POLLIN, .fd = p->kms->fd },
};
poll(fds, 1, timeout_ms);
if (fds[0].revents & POLLIN) {
ret = drmHandleEvent(p->kms->fd, &p->ev);
if (ret != 0) {
MP_ERR(vo, "drmHandleEvent failed: %i\n", ret);
return;
}
}
}
static void uninit(struct vo *vo)
{
struct priv *p = vo->priv;
crtc_release(vo);
for (unsigned int i = 0; i < BUF_COUNT; i++)
fb_destroy(p->kms->fd, &p->bufs[i]);
if (p->kms) {
kms_destroy(p->kms);
p->kms = NULL;
}
if (p->vt_switcher_active)
vt_switcher_destroy(&p->vt_switcher);
talloc_free(p->last_input);
talloc_free(p->cur_frame);
}
static int preinit(struct vo *vo)
{
struct priv *p = vo->priv;
p->sws = mp_sws_alloc(vo);
p->ev.version = DRM_EVENT_CONTEXT_VERSION;
p->ev.page_flip_handler = page_flipped;
p->vt_switcher_active = vt_switcher_init(&p->vt_switcher, vo->log);
if (p->vt_switcher_active) {
vt_switcher_acquire(&p->vt_switcher, acquire_vt, vo);
vt_switcher_release(&p->vt_switcher, release_vt, vo);
} else {
MP_WARN(vo, "Failed to set up VT switcher. Terminal switching will be unavailable.\n");
}
p->kms = kms_create(vo->log);
if (!p->kms) {
MP_ERR(vo, "Failed to create KMS.\n");
goto err;
}
if (!kms_setup(p->kms, p->device_path, p->connector_id, p->mode_id)) {
MP_ERR(vo, "Failed to configure KMS.\n");
goto err;
}
if (!fb_setup_double_buffering(vo)) {
MP_ERR(vo, "Failed to set up double buffering.\n");
goto err;
}
uint64_t has_dumb;
if (drmGetCap(p->kms->fd, DRM_CAP_DUMB_BUFFER, &has_dumb) < 0) {
MP_ERR(vo, "Device \"%s\" does not support dumb buffers.\n", p->device_path);
goto err;
}
p->device_w = p->bufs[0].width;
p->device_h = p->bufs[0].height;
if (!crtc_setup(vo)) {
MP_ERR(vo,
"Cannot set CRTC for connector %u: %s\n",
p->kms->connector->connector_id,
mp_strerror(errno));
goto err;
}
return 0;
err:
uninit(vo);
return -1;
}
static int query_format(struct vo *vo, int format)
{
return sws_isSupportedInput(imgfmt2pixfmt(format));
}
static int control(struct vo *vo, uint32_t request, void *data)
{
struct priv *p = vo->priv;
switch (request) {
case VOCTRL_SCREENSHOT_WIN:
*(struct mp_image**)data = mp_image_new_copy(p->cur_frame);
return VO_TRUE;
case VOCTRL_REDRAW_FRAME:
draw_image(vo, p->last_input);
return VO_TRUE;
case VOCTRL_GET_PANSCAN:
return VO_TRUE;
case VOCTRL_SET_PANSCAN:
if (vo->config_ok)
reconfig(vo, vo->params);
return VO_TRUE;
}
return VO_NOTIMPL;
}
#define OPT_BASE_STRUCT struct priv
const struct vo_driver video_out_drm = {
.name = "drm",
.description = "Direct Rendering Manager",
.preinit = preinit,
.query_format = query_format,
.reconfig = reconfig,
.control = control,
.draw_image = draw_image,
.flip_page = flip_page,
.uninit = uninit,
.wait_events = wait_events,
.wakeup = wakeup,
.priv_size = sizeof(struct priv),
.options = (const struct m_option[]) {
OPT_STRING("devpath", device_path, 0),
OPT_INT("connector", connector_id, 0),
OPT_INT("mode", mode_id, 0),
{0},
},
.priv_defaults = &(const struct priv) {
.device_path = "/dev/dri/card0",
.connector_id = -1,
.mode_id = 0,
},
};
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