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🎥 Command line media player
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C
123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127/* * This file is part of mpv. * * mpv is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 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 Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with mpv. If not, see <http://www.gnu.org/licenses/>. */
#include <time.h>
#include "misc/linked_list.h"#include "mpv_talloc.h"#include "osdep/timer.h"#include "present_sync.h"
/* General nonsense about this mechanism. * * This requires that that caller has access to two, related values: * (ust, msc): clock time and incrementing counter of last vsync (this is * increased continuously, even if we don't swap) * * Note that this concept originates from the GLX_OML_sync_control extension * which includes another parameter: sbc (swap counter of frame that was * last displayed). Both the xorg present extension and wayland's * presentation-time protocol do not include sbc values so they are omitted * from this mechanism. mpv does not need to keep track of sbc calls and can * have reliable presentation without it. */
void present_sync_get_info(struct mp_present *present, struct vo_vsync_info *info){ struct mp_present_entry *cur = present->head; while (cur) { if (cur->queue_display_time) break; cur = cur->list_node.next; } if (!cur) return;
info->vsync_duration = cur->vsync_duration; info->skipped_vsyncs = cur->skipped_vsyncs; info->last_queue_display_time = cur->queue_display_time;
// Remove from the list, zero out everything, and append at the end LL_REMOVE(list_node, present, cur); *cur = (struct mp_present_entry){0}; LL_APPEND(list_node, present, cur);}
struct mp_present *mp_present_initialize(void *talloc_ctx, struct mp_vo_opts *opts, int entries){ struct mp_present *present = talloc_zero(talloc_ctx, struct mp_present); for (int i = 0; i < entries; i++) { struct mp_present_entry *entry = talloc_zero(present, struct mp_present_entry); LL_APPEND(list_node, present, entry); } present->opts = opts; return present;}
void present_sync_swap(struct mp_present *present){ struct mp_present_entry *cur = present->head; while (cur) { if (!cur->queue_display_time) break; cur = cur->list_node.next; } if (!cur) return;
int64_t ust = cur->ust; int64_t msc = cur->msc; int64_t last_ust = cur->list_node.prev ? cur->list_node.prev->ust : 0; int64_t last_msc = cur->list_node.prev ? cur->list_node.prev->msc : 0;
// Avoid attempting to use any presentation statistics if the ust is 0 or has // not actually updated (i.e. the last_ust is equal to ust). if (!ust || ust == last_ust) { cur->skipped_vsyncs = -1; cur->vsync_duration = -1; cur->queue_display_time = -1; return; }
cur->skipped_vsyncs = 0; int64_t ust_passed = ust ? ust - last_ust: 0; int64_t msc_passed = msc ? msc - last_msc: 0; if (msc_passed && ust_passed) cur->vsync_duration = ust_passed / msc_passed;
struct timespec ts; if (clock_gettime(CLOCK_MONOTONIC, &ts)) return;
int64_t now_monotonic = MP_TIME_S_TO_NS(ts.tv_sec) + ts.tv_nsec; int64_t ust_mp_time = mp_time_ns() - (now_monotonic - ust); cur->queue_display_time = ust_mp_time;}
void present_sync_update_values(struct mp_present *present, int64_t ust, int64_t msc){ struct mp_present_entry *cur = present->head; int index = 0; while (cur && ++index) { if (!cur->ust || index == present->opts->swapchain_depth) break; cur = cur->list_node.next; } if (!cur) return;
cur->ust = ust; cur->msc = msc;}