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8a9b64329c
mpv/video/out/vo_drm.c
wm4 0a0bb9059f video: switch from using display aspect to sample aspect 
MPlayer traditionally always used the display aspect ratio, e.g. 16:9,
while FFmpeg uses the sample (aka pixel) aspect ratio.

Both have a bunch of advantages and disadvantages. Actually, it seems
using sample aspect ratio is generally nicer. The main reason for the
change is making mpv closer to how FFmpeg works in order to make life
easier. It's also nice that everything uses integer fractions instead
of floats now (except --video-aspect option/property).

Note that there is at least 1 user-visible change: vf_dsize now does
not set the display size, only the display aspect ratio. This is
because the image_params d_w/d_h fields did not just set the display
aspect, but also the size (except in encoding mode).
2015-12-19 20:45:36 +01:00

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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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