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#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 "gpu/video.h"
#include "gpu/hwdec.h"
#include "opengl/common.h"
#include "opengl/context.h"
#include "opengl/ra_gl.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];
bool update_new_opts;
struct vo *active;
// --- 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 ra_ctx *ra_ctx;
struct gl_video *renderer;
struct m_config_cache *vo_opts_cache;
struct mp_vo_opts *vo_opts;
};
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->vo_opts_cache = m_config_cache_alloc(ctx, ctx->global, &vo_sub_opts);
ctx->vo_opts = ctx->vo_opts_cache->opts;
return ctx;
}
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);
}
// Reset some GL attributes the user might clobber. For mid-term compatibility
// only - we expect both user code and our code to do this correctly.
static void reset_gl_state(GL *gl)
{
gl->ActiveTexture(GL_TEXTURE0);
if (gl->mpgl_caps & MPGL_CAP_ROW_LENGTH)
gl->PixelStorei(GL_UNPACK_ROW_LENGTH, 0);
gl->PixelStorei(GL_UNPACK_ALIGNMENT, 4);
}
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;
}
// initialize a blank ra_ctx to reuse ra_gl_ctx
ctx->ra_ctx = talloc_zero(ctx, struct ra_ctx);
ctx->ra_ctx->log = ctx->log;
ctx->ra_ctx->global = ctx->global;
ctx->ra_ctx->opts = (struct ra_ctx_opts) {
.probing = false,
.allow_sw = true,
};
static const struct ra_swapchain_fns empty_swapchain_fns = {0};
struct ra_gl_ctx_params gl_params = {
// vo_opengl_cb is essentially like a gigantic external swapchain where
// the user is in charge of presentation / swapping etc. But we don't
// actually need to provide any of these functions, since we can just
// not call them to begin with - so just set it to an empty object to
// signal to ra_gl_ctx that we don't care about its latency emulation
// functionality
.external_swapchain = &empty_swapchain_fns
};
ctx->gl->SwapInterval = NULL; // we shouldn't randomly change this, so lock it
if (!ra_gl_ctx_init(ctx->ra_ctx, ctx->gl, gl_params))
return MPV_ERROR_UNSUPPORTED;
ctx->renderer = gl_video_init(ctx->ra_ctx->ra, ctx->log, ctx->global);
ctx->hwdec_devs = hwdec_devices_create();
gl_video_load_hwdecs(ctx->renderer, ctx->hwdec_devs, true);
pthread_mutex_lock(&ctx->lock);
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);
reset_gl_state(ctx->gl);
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;
hwdec_devices_destroy(ctx->hwdec_devs);
ctx->hwdec_devs = NULL;
ra_gl_ctx_uninit(ctx->ra_ctx);
talloc_free(ctx->ra_ctx);
talloc_free(ctx->gl);
ctx->ra_ctx = NULL;
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);
if (fbo && !(ctx->gl->mpgl_caps & MPGL_CAP_FB)) {
MP_FATAL(ctx, "Rendering to FBO requested, but no FBO extension found!\n");
return MPV_ERROR_UNSUPPORTED;
}
reset_gl_state(ctx->gl);
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;
m_config_cache_update(ctx->vo_opts_cache);
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, &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);
}
if (ctx->update_new_opts) {
if (vo)
gl_video_configure_queue(ctx->renderer, vo);
int debug;
mp_read_option_raw(ctx->global, "gpu-debug", &m_option_type_flag,
&debug);
ctx->gl->debug_context = debug;
ra_gl_set_debug(ctx->ra_ctx->ra, 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 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");
struct ra_swapchain *sw = ctx->ra_ctx->swapchain;
struct ra_fbo target;
ra_gl_ctx_resize(sw, vp_w, abs(vp_h), fbo);
ra_gl_ctx_start_frame(sw, &target);
target.flip = vp_h < 0;
gl_video_render_frame(ctx->renderer, frame, target);
ra_gl_ctx_submit_frame(sw, frame);
reset_gl_state(ctx->gl);
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;
return VO_TRUE;
case VOCTRL_SET_EQUALIZER:
vo->want_redraw = true;
return VO_TRUE;
case VOCTRL_SET_PANSCAN:
pthread_mutex_lock(&p->ctx->lock);
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;
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),
};
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