mirror of
https://github.com/mpv-player/mpv
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4aa3866400
This was specifically special logic for drm. Before present_sync, it would also clear out all of its vsync values like this. The old drm code would save a bunch of samples which would confuse vo.c when unpausing since it got old, bogus values. Since we make sure to match successive vsync samples with the swapchain depth and that present sync samples also match the swapchain depth, this is unneeded.
127 lines
4.1 KiB
C
127 lines
4.1 KiB
C
/*
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* This file is part of mpv.
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*
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* mpv is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* mpv is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with mpv. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <time.h>
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#include "misc/linked_list.h"
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#include "mpv_talloc.h"
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#include "osdep/timer.h"
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#include "present_sync.h"
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/* General nonsense about this mechanism.
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*
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* This requires that that caller has access to two, related values:
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* (ust, msc): clock time and incrementing counter of last vsync (this is
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* increased continuously, even if we don't swap)
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*
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* Note that this concept originates from the GLX_OML_sync_control extension
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* which includes another parameter: sbc (swap counter of frame that was
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* last displayed). Both the xorg present extension and wayland's
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* presentation-time protocol do not include sbc values so they are omitted
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* from this mechanism. mpv does not need to keep track of sbc calls and can
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* have reliable presentation without it.
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*/
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void present_sync_get_info(struct mp_present *present, struct vo_vsync_info *info)
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{
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struct mp_present_entry *cur = present->head;
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while (cur) {
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if (cur->queue_display_time)
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break;
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cur = cur->list_node.next;
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}
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if (!cur)
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return;
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info->vsync_duration = cur->vsync_duration;
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info->skipped_vsyncs = cur->skipped_vsyncs;
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info->last_queue_display_time = cur->queue_display_time;
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// Remove from the list, zero out everything, and append at the end
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LL_REMOVE(list_node, present, cur);
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*cur = (struct mp_present_entry){0};
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LL_APPEND(list_node, present, cur);
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}
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struct mp_present *mp_present_initialize(void *talloc_ctx, struct mp_vo_opts *opts, int entries)
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{
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struct mp_present *present = talloc_zero(talloc_ctx, struct mp_present);
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for (int i = 0; i < entries; i++) {
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struct mp_present_entry *entry = talloc_zero(present, struct mp_present_entry);
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LL_APPEND(list_node, present, entry);
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}
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present->opts = opts;
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return present;
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}
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void present_sync_swap(struct mp_present *present)
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{
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struct mp_present_entry *cur = present->head;
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while (cur) {
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if (!cur->queue_display_time)
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break;
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cur = cur->list_node.next;
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}
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if (!cur)
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return;
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int64_t ust = cur->ust;
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int64_t msc = cur->msc;
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int64_t last_ust = cur->list_node.prev ? cur->list_node.prev->ust : 0;
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int64_t last_msc = cur->list_node.prev ? cur->list_node.prev->msc : 0;
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// Avoid attempting to use any presentation statistics if the ust is 0 or has
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// not actually updated (i.e. the last_ust is equal to ust).
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if (!ust || ust == last_ust) {
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cur->skipped_vsyncs = -1;
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cur->vsync_duration = -1;
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cur->queue_display_time = -1;
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return;
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}
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cur->skipped_vsyncs = 0;
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int64_t ust_passed = ust ? ust - last_ust: 0;
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int64_t msc_passed = msc ? msc - last_msc: 0;
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if (msc_passed && ust_passed)
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cur->vsync_duration = ust_passed / msc_passed;
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struct timespec ts;
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if (clock_gettime(CLOCK_MONOTONIC, &ts))
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return;
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int64_t now_monotonic = MP_TIME_S_TO_NS(ts.tv_sec) + ts.tv_nsec;
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int64_t ust_mp_time = mp_time_ns() - (now_monotonic - ust);
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cur->queue_display_time = ust_mp_time;
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}
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void present_sync_update_values(struct mp_present *present, int64_t ust,
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int64_t msc)
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{
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struct mp_present_entry *cur = present->head;
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int index = 0;
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while (cur && ++index) {
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if (!cur->ust || index == present->opts->swapchain_depth)
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break;
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cur = cur->list_node.next;
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}
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if (!cur)
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return;
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cur->ust = ust;
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cur->msc = msc;
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}
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