aboutsummaryrefslogtreecommitdiffhomepage
path: root/video/out/vo_opengl_cb.c
blob: 852b7900dab78ff755d2861f9da0642d516c3656 (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
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <math.h>
#include <stdbool.h>
#include <limits.h>
#include <pthread.h>
#include <assert.h>

#include "config.h"

#include "mpv_talloc.h"
#include "common/common.h"
#include "misc/bstr.h"
#include "common/msg.h"
#include "options/m_config.h"
#include "options/options.h"
#include "aspect.h"
#include "vo.h"
#include "video/mp_image.h"
#include "sub/osd.h"
#include "osdep/timer.h"

#include "common/global.h"
#include "player/client.h"

#include "opengl/common.h"
#include "opengl/video.h"
#include "opengl/hwdec.h"

#include "libmpv/opengl_cb.h"

/*
 * mpv_opengl_cb_context is created by the host application - the host application
 * can access it any time, even if the VO is destroyed (or not created yet).
 * The OpenGL object allows initializing the renderer etc. The VO object is only
 * here to transfer the video frames somehow.
 *
 * Locking hierarchy:
 * - the libmpv user can mix openglcb and normal API; thus openglcb API
 *   functions can wait on the core, but not the reverse
 * - the core does blocking calls into the VO thread, thus the VO functions
 *   can't wait on the user calling the API functions
 * - to make video timing work like it should, the VO thread waits on the
 *   openglcb API user anyway, and the (unlikely) deadlock is avoided with
 *   a timeout
 */

struct vo_priv {
    struct mpv_opengl_cb_context *ctx;
};

struct mpv_opengl_cb_context {
    struct mp_log *log;
    struct mpv_global *global;
    struct mp_client_api *client_api;

    pthread_mutex_t lock;
    pthread_cond_t wakeup;

    // --- Protected by lock
    bool initialized;
    mpv_opengl_cb_update_fn update_cb;
    void *update_cb_ctx;
    struct vo_frame *next_frame;    // next frame to draw
    int64_t present_count;          // incremented when next frame can be shown
    int64_t expected_flip_count;    // next vsync event for next_frame
    bool redrawing;                 // next_frame was a redraw request
    int64_t flip_count;
    struct vo_frame *cur_frame;
    struct mp_image_params img_params;
    bool reconfigured, reset;
    int vp_w, vp_h;
    bool flip;
    bool force_update;
    bool imgfmt_supported[IMGFMT_END - IMGFMT_START];
    struct mp_vo_opts vo_opts;
    bool update_new_opts;
    bool eq_changed;
    struct mp_csp_equalizer eq;
    struct vo *active;
    int hwdec_api;

    // --- This is only mutable while initialized=false, during which nothing
    //     except the OpenGL context manager is allowed to access it.
    struct mp_hwdec_devices *hwdec_devs;

    // --- All of these can only be accessed from the thread where the host
    //     application's OpenGL context is current - i.e. only while the
    //     host application is calling certain mpv_opengl_cb_* APIs.
    GL *gl;
    struct gl_video *renderer;
    struct gl_hwdec *hwdec;
};

static void update(struct vo_priv *p);

static void forget_frames(struct mpv_opengl_cb_context *ctx, bool all)
{
    pthread_cond_broadcast(&ctx->wakeup);
    if (all) {
        talloc_free(ctx->cur_frame);
        ctx->cur_frame = NULL;
    }
}

static void free_ctx(void *ptr)
{
    mpv_opengl_cb_context *ctx = ptr;

    // This can trigger if the client API user doesn't call
    // mpv_opengl_cb_uninit_gl() properly.
    assert(!ctx->initialized);

    pthread_cond_destroy(&ctx->wakeup);
    pthread_mutex_destroy(&ctx->lock);
}

struct mpv_opengl_cb_context *mp_opengl_create(struct mpv_global *g,
                                               struct mp_client_api *client_api)
{
    mpv_opengl_cb_context *ctx = talloc_zero(NULL, mpv_opengl_cb_context);
    talloc_set_destructor(ctx, free_ctx);
    pthread_mutex_init(&ctx->lock, NULL);
    pthread_cond_init(&ctx->wakeup, NULL);

    ctx->global = g;
    ctx->log = mp_log_new(ctx, g->log, "opengl-cb");
    ctx->client_api = client_api;

    ctx->hwdec_api = g->opts->vo->hwdec_preload_api;
    if (ctx->hwdec_api == HWDEC_NONE)
        ctx->hwdec_api = g->opts->hwdec_api;

    return ctx;
}

// To be called from VO thread, with p->ctx->lock held.
static void copy_vo_opts(struct vo *vo)
{
    struct vo_priv *p = vo->priv;

    // We're being lazy: none of the options we need use dynamic data, so
    // copy the struct with an assignment.
    // Just remove all the dynamic data to avoid confusion.
    struct mp_vo_opts opts = *vo->opts;
    opts.video_driver_list = NULL;
    opts.winname = NULL;
    opts.sws_opts = NULL;
    p->ctx->vo_opts = opts;
}

void mpv_opengl_cb_set_update_callback(struct mpv_opengl_cb_context *ctx,
                                      mpv_opengl_cb_update_fn callback,
                                      void *callback_ctx)
{
    pthread_mutex_lock(&ctx->lock);
    ctx->update_cb = callback;
    ctx->update_cb_ctx = callback_ctx;
    pthread_mutex_unlock(&ctx->lock);
}

int mpv_opengl_cb_init_gl(struct mpv_opengl_cb_context *ctx, const char *exts,
                          mpv_opengl_cb_get_proc_address_fn get_proc_address,
                          void *get_proc_address_ctx)
{
    if (ctx->renderer)
        return MPV_ERROR_INVALID_PARAMETER;

    talloc_free(ctx->gl);
    ctx->gl = talloc_zero(ctx, GL);

    mpgl_load_functions2(ctx->gl, get_proc_address, get_proc_address_ctx,
                         exts, ctx->log);
    if (!ctx->gl->version && !ctx->gl->es) {
        MP_FATAL(ctx, "OpenGL not initialized.\n");
        return MPV_ERROR_UNSUPPORTED;
    }

    ctx->renderer = gl_video_init(ctx->gl, ctx->log, ctx->global);
    if (!ctx->renderer)
        return MPV_ERROR_UNSUPPORTED;

    ctx->hwdec_devs = hwdec_devices_create();
    ctx->hwdec = gl_hwdec_load_api(ctx->log, ctx->gl, ctx->global,
                                   ctx->hwdec_devs, ctx->hwdec_api);
    gl_video_set_hwdec(ctx->renderer, ctx->hwdec);

    pthread_mutex_lock(&ctx->lock);
    // We don't know the exact caps yet - use a known superset
    ctx->eq.capabilities = MP_CSP_EQ_CAPS_GAMMA | MP_CSP_EQ_CAPS_BRIGHTNESS |
                           MP_CSP_EQ_CAPS_COLORMATRIX;
    ctx->eq_changed = true;
    for (int n = IMGFMT_START; n < IMGFMT_END; n++) {
        ctx->imgfmt_supported[n - IMGFMT_START] =
            gl_video_check_format(ctx->renderer, n);
    }
    ctx->initialized = true;
    pthread_mutex_unlock(&ctx->lock);

    gl_video_unset_gl_state(ctx->renderer);
    return 0;
}

int mpv_opengl_cb_uninit_gl(struct mpv_opengl_cb_context *ctx)
{
    if (!ctx)
        return 0;

    // Bring down the decoder etc., which still might be using the hwdec
    // context. Setting initialized=false guarantees it can't come back.

    pthread_mutex_lock(&ctx->lock);
    forget_frames(ctx, true);
    ctx->initialized = false;
    pthread_mutex_unlock(&ctx->lock);

    kill_video(ctx->client_api);

    pthread_mutex_lock(&ctx->lock);
    assert(!ctx->active);
    pthread_mutex_unlock(&ctx->lock);

    gl_video_uninit(ctx->renderer);
    ctx->renderer = NULL;
    gl_hwdec_uninit(ctx->hwdec);
    ctx->hwdec = NULL;
    hwdec_devices_destroy(ctx->hwdec_devs);
    ctx->hwdec_devs = NULL;
    talloc_free(ctx->gl);
    ctx->gl = NULL;
    return 0;
}

int mpv_opengl_cb_draw(mpv_opengl_cb_context *ctx, int fbo, int vp_w, int vp_h)
{
    assert(ctx->renderer);

    gl_video_set_gl_state(ctx->renderer);

    pthread_mutex_lock(&ctx->lock);

    struct vo *vo = ctx->active;

    ctx->force_update |= ctx->reconfigured;

    if (ctx->vp_w != vp_w || ctx->vp_h != vp_h)
        ctx->force_update = true;

    if (ctx->force_update && vo) {
        ctx->force_update = false;
        ctx->vp_w = vp_w;
        ctx->vp_h = vp_h;

        struct mp_rect src, dst;
        struct mp_osd_res osd;
        mp_get_src_dst_rects(ctx->log, &ctx->vo_opts, vo->driver->caps,
                             &ctx->img_params, vp_w, abs(vp_h),
                             1.0, &src, &dst, &osd);

        gl_video_resize(ctx->renderer, vp_w, vp_h, &src, &dst, &osd);
    }

    if (ctx->reconfigured) {
        gl_video_set_osd_source(ctx->renderer, vo ? vo->osd : NULL);
        gl_video_config(ctx->renderer, &ctx->img_params);
        ctx->eq_changed = true;
    }
    if (ctx->update_new_opts) {
        gl_video_update_options(ctx->renderer);
        if (vo)
            gl_video_configure_queue(ctx->renderer, vo);
        int debug;
        mp_read_option_raw(ctx->global, "opengl-debug", &m_option_type_flag,
                           &debug);
        ctx->gl->debug_context = debug;
        gl_video_set_debug(ctx->renderer, debug);
        if (gl_video_icc_auto_enabled(ctx->renderer))
            MP_ERR(ctx, "icc-profile-auto is not available with opengl-cb\n");
    }
    ctx->reconfigured = false;
    ctx->update_new_opts = false;

    if (ctx->reset) {
        gl_video_reset(ctx->renderer);
        ctx->reset = false;
        if (ctx->cur_frame)
            ctx->cur_frame->still = true;
    }

    struct mp_csp_equalizer *eq = gl_video_eq_ptr(ctx->renderer);
    if (ctx->eq_changed) {
        memcpy(eq->values, ctx->eq.values, sizeof(eq->values));
        gl_video_eq_update(ctx->renderer);
    }
    ctx->eq_changed = false;

    struct vo_frame *frame = ctx->next_frame;
    int64_t wait_present_count = ctx->present_count;
    if (frame) {
        ctx->next_frame = NULL;
        if (!(frame->redraw || !frame->current))
            wait_present_count += 1;
        pthread_cond_signal(&ctx->wakeup);
        talloc_free(ctx->cur_frame);
        ctx->cur_frame = vo_frame_ref(frame);
    } else {
        frame = vo_frame_ref(ctx->cur_frame);
        if (frame)
            frame->redraw = true;
        MP_STATS(ctx, "glcb-noframe");
    }
    struct vo_frame dummy = {0};
    if (!frame)
        frame = &dummy;

    pthread_mutex_unlock(&ctx->lock);

    MP_STATS(ctx, "glcb-render");
    gl_video_render_frame(ctx->renderer, frame, fbo);

    gl_video_unset_gl_state(ctx->renderer);

    if (frame != &dummy)
        talloc_free(frame);

    pthread_mutex_lock(&ctx->lock);
    while (wait_present_count > ctx->present_count)
        pthread_cond_wait(&ctx->wakeup, &ctx->lock);
    pthread_mutex_unlock(&ctx->lock);

    return 0;
}

int mpv_opengl_cb_report_flip(mpv_opengl_cb_context *ctx, int64_t time)
{
    MP_STATS(ctx, "glcb-reportflip");

    pthread_mutex_lock(&ctx->lock);
    ctx->flip_count += 1;
    pthread_cond_signal(&ctx->wakeup);
    pthread_mutex_unlock(&ctx->lock);

    return 0;
}

// Called locked.
static void update(struct vo_priv *p)
{
    if (p->ctx->update_cb)
        p->ctx->update_cb(p->ctx->update_cb_ctx);
}

static void draw_frame(struct vo *vo, struct vo_frame *frame)
{
    struct vo_priv *p = vo->priv;

    pthread_mutex_lock(&p->ctx->lock);
    assert(!p->ctx->next_frame);
    p->ctx->next_frame = vo_frame_ref(frame);
    p->ctx->expected_flip_count = p->ctx->flip_count + 1;
    p->ctx->redrawing = frame->redraw || !frame->current;
    update(p);
    pthread_mutex_unlock(&p->ctx->lock);
}

static void flip_page(struct vo *vo)
{
    struct vo_priv *p = vo->priv;
    struct timespec ts = mp_rel_time_to_timespec(0.2);

    pthread_mutex_lock(&p->ctx->lock);

    // Wait until frame was rendered
    while (p->ctx->next_frame) {
        if (pthread_cond_timedwait(&p->ctx->wakeup, &p->ctx->lock, &ts)) {
            if (p->ctx->next_frame) {
                MP_VERBOSE(vo, "mpv_opengl_cb_draw() not being called or stuck.\n");
                goto done;
            }
        }
    }

    // Unblock mpv_opengl_cb_draw().
    p->ctx->present_count += 1;
    pthread_cond_signal(&p->ctx->wakeup);

    if (p->ctx->redrawing)
        goto done; // do not block for redrawing

    // Wait until frame was presented
    while (p->ctx->expected_flip_count > p->ctx->flip_count) {
        // mpv_opengl_cb_report_flip() is declared as optional API.
        // Assume the user calls it consistently _if_ it's called at all.
        if (!p->ctx->flip_count)
            break;
        if (pthread_cond_timedwait(&p->ctx->wakeup, &p->ctx->lock, &ts)) {
            MP_VERBOSE(vo, "mpv_opengl_cb_report_flip() not being called.\n");
            goto done;
        }
    }

done:

    // Cleanup after the API user is not reacting, or is being unusually slow.
    if (p->ctx->next_frame) {
        talloc_free(p->ctx->cur_frame);
        p->ctx->cur_frame = p->ctx->next_frame;
        p->ctx->next_frame = NULL;
        p->ctx->present_count += 2;
        pthread_cond_signal(&p->ctx->wakeup);
        vo_increment_drop_count(vo, 1);
    }

    pthread_mutex_unlock(&p->ctx->lock);
}

static int query_format(struct vo *vo, int format)
{
    struct vo_priv *p = vo->priv;

    bool ok = false;
    pthread_mutex_lock(&p->ctx->lock);
    if (format >= IMGFMT_START && format < IMGFMT_END)
        ok = p->ctx->imgfmt_supported[format - IMGFMT_START];
    pthread_mutex_unlock(&p->ctx->lock);
    return ok;
}

static int reconfig(struct vo *vo, struct mp_image_params *params)
{
    struct vo_priv *p = vo->priv;

    pthread_mutex_lock(&p->ctx->lock);
    forget_frames(p->ctx, true);
    p->ctx->img_params = *params;
    p->ctx->reconfigured = true;
    pthread_mutex_unlock(&p->ctx->lock);

    return 0;
}

static int control(struct vo *vo, uint32_t request, void *data)
{
    struct vo_priv *p = vo->priv;

    switch (request) {
    case VOCTRL_RESET:
        pthread_mutex_lock(&p->ctx->lock);
        forget_frames(p->ctx, false);
        p->ctx->reset = true;
        pthread_mutex_unlock(&p->ctx->lock);
        return VO_TRUE;
    case VOCTRL_PAUSE:
        vo->want_redraw = true;
        vo_wakeup(vo);
        return VO_TRUE;
    case VOCTRL_GET_EQUALIZER: {
        struct voctrl_get_equalizer_args *args = data;
        pthread_mutex_lock(&p->ctx->lock);
        bool r = mp_csp_equalizer_get(&p->ctx->eq, args->name, args->valueptr) >= 0;
        pthread_mutex_unlock(&p->ctx->lock);
        return r ? VO_TRUE : VO_NOTIMPL;
    }
    case VOCTRL_SET_EQUALIZER: {
        struct voctrl_set_equalizer_args *args = data;
        pthread_mutex_lock(&p->ctx->lock);
        bool r = mp_csp_equalizer_set(&p->ctx->eq, args->name, args->value) >= 0;
        if (r) {
            p->ctx->eq_changed = true;
            update(p);
        }
        pthread_mutex_unlock(&p->ctx->lock);
        return r ? VO_TRUE : VO_NOTIMPL;
    }
    case VOCTRL_SET_PANSCAN:
        pthread_mutex_lock(&p->ctx->lock);
        copy_vo_opts(vo);
        p->ctx->force_update = true;
        update(p);
        pthread_mutex_unlock(&p->ctx->lock);
        return VO_TRUE;
    case VOCTRL_UPDATE_RENDER_OPTS:
        pthread_mutex_lock(&p->ctx->lock);
        p->ctx->update_new_opts = true;
        update(p);
        pthread_mutex_unlock(&p->ctx->lock);
        return VO_TRUE;
    }

    return VO_NOTIMPL;
}

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

    pthread_mutex_lock(&p->ctx->lock);
    forget_frames(p->ctx, true);
    p->ctx->img_params = (struct mp_image_params){0};
    p->ctx->reconfigured = true;
    p->ctx->active = NULL;
    update(p);
    pthread_mutex_unlock(&p->ctx->lock);
}

static int preinit(struct vo *vo)
{
    struct vo_priv *p = vo->priv;
    p->ctx = vo->extra.opengl_cb_context;
    if (!p->ctx) {
        MP_FATAL(vo, "No context set.\n");
        return -1;
    }

    pthread_mutex_lock(&p->ctx->lock);
    if (!p->ctx->initialized) {
        MP_FATAL(vo, "OpenGL context not initialized.\n");
        pthread_mutex_unlock(&p->ctx->lock);
        return -1;
    }
    p->ctx->active = vo;
    p->ctx->reconfigured = true;
    p->ctx->update_new_opts = true;
    copy_vo_opts(vo);
    memset(p->ctx->eq.values, 0, sizeof(p->ctx->eq.values));
    p->ctx->eq_changed = true;
    pthread_mutex_unlock(&p->ctx->lock);

    vo->hwdec_devs = p->ctx->hwdec_devs;

    return 0;
}

const struct vo_driver video_out_opengl_cb = {
    .description = "OpenGL Callbacks for libmpv",
    .name = "opengl-cb",
    .caps = VO_CAP_ROTATE90,
    .preinit = preinit,
    .query_format = query_format,
    .reconfig = reconfig,
    .control = control,
    .draw_frame = draw_frame,
    .flip_page = flip_page,
    .uninit = uninit,
    .priv_size = sizeof(struct vo_priv),
};