summaryrefslogtreecommitdiffstats
path: root/video/out/vo_drm.c
blob: 3722f07db6200d83d5acf39a39c20a0b99f043b9 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
/*
 * video output driver for libdrm
 *
 * by rr- <rr-@sakuya.pl>
 *
 * 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 <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 USE_MASTER 0
#define BUF_COUNT 2

struct modeset_buf {
    uint32_t width;
    uint32_t height;
    uint32_t stride;
    uint32_t size;
    uint32_t handle;
    uint8_t *map;
    uint32_t fb;
};

struct modeset_dev {
    struct modeset_buf bufs[BUF_COUNT];
    drmModeModeInfo mode;
    drmModeEncoder *enc;
    uint32_t conn;
    uint32_t crtc;
    int front_buf;
};

struct priv {
    char *device_path;
    int connector_id;

    int fd;
    struct vt_switcher vt_switcher;
    struct modeset_dev *dev;
    drmModeCrtc *old_crtc;
    drmEventContext ev;

    bool active;
    bool pflip_happening;

    int32_t device_w;
    int32_t device_h;
    int32_t x, y;
    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 int modeset_open(struct vo *vo, int *out, const char *node)
{
    *out = -1;

    int fd = open(node, O_RDWR | O_CLOEXEC);
    if (fd < 0) {
        MP_ERR(vo, "Cannot open \"%s\": %s.\n", node, mp_strerror(errno));
        return -errno;
    }

    uint64_t has_dumb;
    if (drmGetCap(fd, DRM_CAP_DUMB_BUFFER, &has_dumb) < 0) {
        MP_ERR(vo, "Device \"%s\" does not support dumb buffers.\n", node);
        return -EOPNOTSUPP;
    }

    *out = fd;
    return 0;
}

static void modeset_destroy_fb(int fd, struct modeset_buf *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 int modeset_create_fb(struct vo *vo, int fd, struct modeset_buf *buf)
{
    int ret = 0;

    buf->handle = 0;

    // create dumb buffer
    struct drm_mode_create_dumb creq = {
        .width = buf->width,
        .height = buf->height,
        .bpp = 32,
    };
    ret = drmIoctl(fd, DRM_IOCTL_MODE_CREATE_DUMB, &creq);
    if (ret < 0) {
        MP_ERR(vo, "Cannot create dumb buffer: %s\n", mp_strerror(errno));
        ret = -errno;
        goto end;
    }
    buf->stride = creq.pitch;
    buf->size = creq.size;
    buf->handle = creq.handle;

    // create framebuffer object for the dumb-buffer
    ret = drmModeAddFB(fd, buf->width, buf->height, 24, 32, buf->stride,
                       buf->handle, &buf->fb);
    if (ret) {
        MP_ERR(vo, "Cannot create framebuffer: %s\n", mp_strerror(errno));
        ret = -errno;
        goto end;
    }

    // prepare buffer for memory mapping
    struct drm_mode_map_dumb mreq = {
        .handle = buf->handle,
    };
    ret = drmIoctl(fd, DRM_IOCTL_MODE_MAP_DUMB, &mreq);
    if (ret) {
        MP_ERR(vo, "Cannot map dumb buffer: %s\n", mp_strerror(errno));
        ret = -errno;
        goto end;
    }

    // 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));
        ret = -errno;
        goto end;
    }

    memset(buf->map, 0, buf->size);

end:
    if (ret == 0) {
        return 0;
    }

    modeset_destroy_fb(fd, buf);
    return ret;
}

static int modeset_find_crtc(struct vo *vo, int fd, drmModeRes *res,
                             drmModeConnector *conn, struct modeset_dev *dev)
{
    for (unsigned int i = 0; i < conn->count_encoders; ++i) {
        drmModeEncoder *enc = drmModeGetEncoder(fd, conn->encoders[i]);
        if (!enc) {
            MP_WARN(vo, "Cannot retrieve encoder %u:%u: %s\n",
                    i, conn->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 (!(enc->possible_crtcs & (1 << j)))
                continue;

            dev->enc = enc;
            dev->crtc = enc->crtc_id;
            return 0;
        }

        drmModeFreeEncoder(enc);
    }

    MP_ERR(vo, "Connector %u has no suitable CRTC\n", conn->connector_id);
    return -ENOENT;
}

static bool is_connector_valid(struct vo *vo, int conn_id,
                               drmModeConnector *conn, bool silent)
{
    if (!conn) {
        if (!silent) {
            MP_ERR(vo, "Cannot get connector %d: %s\n", conn_id,
                   mp_strerror(errno));
        }
        return false;
    }

    if (conn->connection != DRM_MODE_CONNECTED) {
        if (!silent) {
            MP_ERR(vo, "Connector %d is disconnected\n", conn_id);
        }
        return false;
    }

    if (conn->count_modes == 0) {
        if (!silent) {
            MP_ERR(vo, "Connector %d has no valid modes\n", conn_id);
        }
        return false;
    }

    return true;
}

static int modeset_prepare_dev(struct vo *vo, int fd, int conn_id,
                               struct modeset_dev **out)
{
    struct modeset_dev *dev = NULL;
    drmModeConnector *conn = NULL;

    int ret = 0;
    *out = NULL;

    drmModeRes *res = drmModeGetResources(fd);
    if (!res) {
        MP_ERR(vo, "Cannot retrieve DRM resources: %s\n", mp_strerror(errno));
        ret = -errno;
        goto end;
    }

    if (conn_id == -1) {
        // get the first connected connector
        for (int i = 0; i < res->count_connectors; i++) {
            conn = drmModeGetConnector(fd, res->connectors[i]);
            if (is_connector_valid(vo, i, conn, true)) {
                conn_id = i;
                break;
            }
            if (conn) {
                drmModeFreeConnector(conn);
                conn = NULL;
            }
        }
        if (conn_id == -1) {
            MP_ERR(vo, "No connected connectors found\n");
            ret = -ENODEV;
            goto end;
        }
    }

    if (conn_id < 0 || conn_id >= res->count_connectors) {
        MP_ERR(vo, "Bad connector ID. Max valid connector ID = %u\n",
               res->count_connectors);
        ret = -ENODEV;
        goto end;
    }

    conn = drmModeGetConnector(fd, res->connectors[conn_id]);
    if (!is_connector_valid(vo, conn_id, conn, false)) {
        ret = -ENODEV;
        goto end;
    }

    dev = talloc_zero(vo->priv, struct modeset_dev);
    dev->conn = conn->connector_id;
    dev->front_buf = 0;
    dev->mode = conn->modes[0];
    dev->bufs[0].width = conn->modes[0].hdisplay;
    dev->bufs[0].height = conn->modes[0].vdisplay;
    dev->bufs[1].width = conn->modes[0].hdisplay;
    dev->bufs[1].height = conn->modes[0].vdisplay;

    MP_INFO(vo, "Connector using mode %ux%u\n",
            dev->bufs[0].width, dev->bufs[0].height);

    ret = modeset_find_crtc(vo, fd, res, conn, dev);
    if (ret) {
        MP_ERR(vo, "Connector %d has no valid CRTC\n", conn_id);
        goto end;
    }

    for (unsigned int i = 0; i < BUF_COUNT; i++) {
        ret = modeset_create_fb(vo, fd, &dev->bufs[i]);
        if (ret) {
            MP_ERR(vo, "Cannot create framebuffer for connector %d\n",
                   conn_id);
            for (unsigned int j = 0; j < i; j++) {
                modeset_destroy_fb(fd, &dev->bufs[j]);
            }
            goto end;
        }
    }

end:
    if (conn) {
        drmModeFreeConnector(conn);
        conn = NULL;
    }
    if (res) {
        drmModeFreeResources(res);
        res = NULL;
    }
    if (ret == 0) {
        *out = dev;
    } else {
        talloc_free(dev);
    }
    return ret;
}

static void modeset_page_flipped(int fd, unsigned int frame, unsigned int sec,
                                 unsigned int usec, void *data)
{
    struct priv *p = data;
    p->pflip_happening = false;
}



static int setup_vo_crtc(struct vo *vo)
{
    struct priv *p = vo->priv;
    p->old_crtc = drmModeGetCrtc(p->fd, p->dev->crtc);
    int ret = drmModeSetCrtc(p->fd, p->dev->crtc,
                          p->dev->bufs[p->dev->front_buf + BUF_COUNT - 1].fb,
                          0, 0, &p->dev->conn, 1, &p->dev->mode);
    p->active = true;
    return ret;
}

static void release_vo_crtc(struct vo *vo)
{
    struct priv *p = vo->priv;

    p->active = false;

    // wait for current page flip
    while (p->pflip_happening) {
        int ret = drmHandleEvent(p->fd, &p->ev);
        if (ret) {
            MP_ERR(vo, "drmHandleEvent failed: %i\n", ret);
            break;
        }
    }

    if (p->old_crtc) {
        drmModeSetCrtc(p->fd,
                       p->old_crtc->crtc_id,
                       p->old_crtc->buffer_id,
                       p->old_crtc->x,
                       p->old_crtc->y,
                       &p->dev->conn,
                       1,
                       &p->dev->mode);
        drmModeFreeCrtc(p->old_crtc);
    }
}

static void release_vt(void *data)
{
    struct vo *vo = data;
    release_vo_crtc(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->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->fd)) {
            MP_WARN(vo, "Failed to acquire DRM master: %s\n", mp_strerror(errno));
        }
    }

    setup_vo_crtc(vo);
}



static int wait_events(struct vo *vo, int64_t until_time_us)
{
    struct priv *p = vo->priv;
    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;
    vt_switcher_interrupt_poll(&p->vt_switcher);
}

static int reconfig(struct vo *vo, struct mp_image_params *params, int flags)
{
    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);

    int32_t w = p->dst.x1 - p->dst.x0;
    int32_t 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);

    p->x = (p->device_w - w) >> 1;
    p->y = (p->device_h - h) >> 1;

    mp_sws_set_from_cmdline(p->sws, vo->opts->sws_opts);
    p->sws->src = *params;
    p->sws->dst = (struct mp_image_params) {
        .imgfmt = IMGFMT_BGR0,
        .w = w,
        .h = h,
        .d_w = w,
        .d_h = h,
    };

    talloc_free(p->cur_frame);
    p->cur_frame = mp_image_alloc(IMGFMT_BGR0, p->device_w, p->device_h);
    mp_image_params_guess_csp(&p->sws->dst);
    mp_image_set_params(p->cur_frame, &p->sws->dst);

    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) {
        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(mpi, src_rc);
        mp_sws_scale(p->sws, p->cur_frame, mpi);
        osd_draw_on_image(vo->osd, p->osd, mpi ? mpi->pts : 0, 0, p->cur_frame);

        struct modeset_buf *front_buf = &p->dev->bufs[p->dev->front_buf];
        int32_t shift = (p->device_w * p->y + p->x) * 4;
        memcpy_pic(front_buf->map + shift,
                   p->cur_frame->planes[0],
                   (p->dst.x1 - p->dst.x0) * 4,
                   p->dst.y1 - p->dst.y0,
                   p->device_w * 4,
                   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) return;
    if (p->pflip_happening) return;

    int ret = drmModePageFlip(p->fd, p->dev->crtc,
                              p->dev->bufs[p->dev->front_buf].fb,
                              DRM_MODE_PAGE_FLIP_EVENT, p);
    if (ret) {
        MP_WARN(vo, "Cannot flip page for connector\n");
    } else {
        p->dev->front_buf++;
        p->dev->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->fd },
    };
    poll(fds, 1, timeout_ms);
    if (fds[0].revents & POLLIN) {
        ret = drmHandleEvent(p->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;

    if (p->dev) {
        release_vo_crtc(vo);

        modeset_destroy_fb(p->fd, &p->dev->bufs[1]);
        modeset_destroy_fb(p->fd, &p->dev->bufs[0]);
        drmModeFreeEncoder(p->dev->enc);
    }

    vt_switcher_destroy(&p->vt_switcher);
    talloc_free(p->last_input);
    talloc_free(p->cur_frame);
    talloc_free(p->dev);
    close(p->fd);
}

static int preinit(struct vo *vo)
{
    struct priv *p = vo->priv;
    p->sws = mp_sws_alloc(vo);
    p->fd = -1;
    p->ev.version = DRM_EVENT_CONTEXT_VERSION;
    p->ev.page_flip_handler = modeset_page_flipped;

    if (vt_switcher_init(&p->vt_switcher, vo->log))
        goto err;

    vt_switcher_acquire(&p->vt_switcher, acquire_vt, vo);
    vt_switcher_release(&p->vt_switcher, release_vt, vo);

    if (modeset_open(vo, &p->fd, p->device_path))
        goto err;

    if (modeset_prepare_dev(vo, p->fd, p->connector_id, &p->dev))
        goto err;

    assert(p->dev);
    p->device_w = p->dev->bufs[0].width;
    p->device_h = p->dev->bufs[0].height;

    if (setup_vo_crtc(vo)) {
        MP_ERR(vo, "Cannot set CRTC for connector %u: %s\n", p->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_REDRAW_FRAME:
        draw_image(vo, p->last_input);
        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),
        {0},
    },
    .priv_defaults = &(const struct priv) {
        .device_path = "/dev/dri/card0",
        .connector_id = -1,
    },
};