mirror of https://github.com/mpv-player/mpv
86 lines
2.9 KiB
C
86 lines
2.9 KiB
C
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/*
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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 "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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info->vsync_duration = present->vsync_duration;
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info->skipped_vsyncs = present->last_skipped_vsyncs;
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info->last_queue_display_time = present->last_queue_display_time;
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}
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void present_sync_swap(struct mp_present *present)
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{
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int64_t ust = present->current_ust;
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int64_t msc = present->current_msc;
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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 current_ust).
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if (!ust || ust == present->last_ust) {
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present->last_skipped_vsyncs = -1;
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present->vsync_duration = -1;
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present->last_queue_display_time = -1;
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return;
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}
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present->last_skipped_vsyncs = 0;
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int64_t ust_passed = ust ? ust - present->last_ust: 0;
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present->last_ust = ust;
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int64_t msc_passed = msc ? msc - present->last_msc: 0;
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present->last_msc = msc;
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if (msc_passed && ust_passed)
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present->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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}
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uint64_t now_monotonic = ts.tv_sec * 1000000LL + ts.tv_nsec / 1000;
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uint64_t ust_mp_time = mp_time_us() - (now_monotonic - ust);
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present->last_queue_display_time = ust_mp_time;
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}
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void present_update_sync_values(struct mp_present *present, int64_t ust,
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int64_t msc)
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{
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present->current_ust = ust;
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present->current_msc = msc;
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}
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