From e6a395c2979689761a5d86bdf1863530f5553f9d Mon Sep 17 00:00:00 2001
From: wm4 <wm4@nowhere>
Date: Wed, 4 Nov 2015 14:26:28 +0100
Subject: vo_opengl, vo_opengl_cb: drop unneeded vo_frame fields

next_vsync/prev_vsync was only used to retrieve the vsync duration. We
can get this in a simpler way.

This also removes the vsync duration estimation from vo_opengl_cb.c,
which is probably worthless anyway. (And once interpolation is made
display-sync only, this won't matter at all.)
---
 video/out/opengl/video.c |  5 ++---
 video/out/vo.c           |  3 +--
 video/out/vo.h           |  5 ++---
 video/out/vo_opengl_cb.c | 21 +--------------------
 4 files changed, 6 insertions(+), 28 deletions(-)

diff --git a/video/out/opengl/video.c b/video/out/opengl/video.c
index 00c7663e91..e7398e50ba 100644
--- a/video/out/opengl/video.c
+++ b/video/out/opengl/video.c
@@ -1859,8 +1859,7 @@ static void gl_video_interpolate_frame(struct gl_video *p, struct vo_frame *t,
 
         // Blend the frames together
         if (oversample) {
-            double vsync_dist = (t->next_vsync - t->prev_vsync)/1e6
-                                / (pts_nxt - pts_now),
+            double vsync_dist = t->vsync_interval / 1e6 / (pts_nxt - pts_now),
                    threshold = tscale->conf.kernel.params[0];
             threshold = isnan(threshold) ? 0.0 : threshold;
             mix = (1 - mix) / vsync_dist;
@@ -1884,7 +1883,7 @@ static void gl_video_interpolate_frame(struct gl_video *p, struct vo_frame *t,
 
         MP_STATS(p, "frame-mix");
         MP_DBG(p, "inter frame pts: %lld, vsync: %lld, mix: %f\n",
-               (long long)t->pts, (long long)t->next_vsync, mix);
+               (long long)t->pts, (long long)t->vsync_interval, mix);
         p->is_interpolated = true;
     }
     pass_draw_to_screen(p, fbo);
diff --git a/video/out/vo.c b/video/out/vo.c
index 46958e7f62..35c583b35f 100644
--- a/video/out/vo.c
+++ b/video/out/vo.c
@@ -640,8 +640,7 @@ static bool render_frame(struct vo *vo)
     int64_t prev_vsync = prev_sync(vo, mp_time_us());
     int64_t next_vsync = prev_vsync + in->vsync_interval;
 
-    frame->next_vsync = next_vsync;
-    frame->prev_vsync = prev_vsync;
+    frame->vsync_interval = in->vsync_interval;
 
     // Time at which we should flip_page on the VO.
     int64_t target = frame->display_synced ? 0 : pts - in->flip_queue_offset;
diff --git a/video/out/vo.h b/video/out/vo.h
index cc280987a5..213b287ab2 100644
--- a/video/out/vo.h
+++ b/video/out/vo.h
@@ -157,9 +157,8 @@ struct vo_frame {
     int64_t pts;
     // Approximate frame duration, in us.
     int duration;
-    // Realtime of estimated previous and next vsync events.
-    int64_t next_vsync;
-    int64_t prev_vsync;
+    // Realtime of estimated distance between 2 vsync events.
+    int64_t vsync_interval;
     // "ideal" display time within the vsync
     int64_t vsync_offset;
     // how often the frame will be repeated (does not include OSD redraws)
diff --git a/video/out/vo_opengl_cb.c b/video/out/vo_opengl_cb.c
index 2be18bb7d7..179fbce684 100644
--- a/video/out/vo_opengl_cb.c
+++ b/video/out/vo_opengl_cb.c
@@ -81,7 +81,6 @@ struct mpv_opengl_cb_context {
     bool eq_changed;
     struct mp_csp_equalizer eq;
     int64_t recent_flip;
-    int64_t approx_vsync;
     bool frozen; // libmpv user is not redrawing frames
     struct vo *active;
     int hwdec_api;
@@ -284,16 +283,6 @@ int mpv_opengl_cb_uninit_gl(struct mpv_opengl_cb_context *ctx)
     return 0;
 }
 
-// needs lock
-static int64_t prev_sync(mpv_opengl_cb_context *ctx, int64_t ts)
-{
-    int64_t diff = (int64_t)(ts - ctx->recent_flip);
-    int64_t offset = diff % ctx->approx_vsync;
-    if (offset < 0)
-        offset += ctx->approx_vsync;
-    return ts - offset;
-}
-
 int mpv_opengl_cb_draw(mpv_opengl_cb_context *ctx, int fbo, int vp_w, int vp_h)
 {
     assert(ctx->renderer);
@@ -370,11 +359,6 @@ int mpv_opengl_cb_draw(mpv_opengl_cb_context *ctx, int fbo, int vp_w, int vp_h)
     if (!frame)
         frame = &dummy;
 
-    if (ctx->approx_vsync > 0) {
-        frame->prev_vsync = prev_sync(ctx, mp_time_us());
-        frame->next_vsync = frame->prev_vsync + ctx->approx_vsync;
-    }
-
     pthread_mutex_unlock(&ctx->lock);
 
     gl_video_render_frame(ctx->renderer, frame, fbo);
@@ -396,10 +380,7 @@ int mpv_opengl_cb_draw(mpv_opengl_cb_context *ctx, int fbo, int vp_w, int vp_h)
 int mpv_opengl_cb_report_flip(mpv_opengl_cb_context *ctx, int64_t time)
 {
     pthread_mutex_lock(&ctx->lock);
-    int64_t next = time > 0 ? time : mp_time_us();
-    if (ctx->recent_flip)
-        ctx->approx_vsync = next - ctx->recent_flip;
-    ctx->recent_flip = next;
+    ctx->recent_flip = time > 0 ? time : mp_time_us();
     pthread_mutex_unlock(&ctx->lock);
 
     return 0;
-- 
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