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vl: round next_msc to integer frame, and kill skew_msc

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This reduces jitter slightly in a cleaner way, without desynchronizing mplayer2 as badly
when falling behind.

Signed-off-by: Maarten Lankhorst <maarten.lankhorst@canonical.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
This commit is contained in:
Maarten Lankhorst 2013-01-19 23:03:53 +01:00
parent 71c87e42e1
commit 3a91e7955a
1 changed files with 2 additions and 5 deletions
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7
src/gallium/auxiliary/vl/vl_winsys_dri.c
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@ -65,7 +65,7 @@ struct vl_dri_screen
xcb_dri2_wait_sbc_cookie_t wait_cookie;
xcb_dri2_get_buffers_cookie_t buffers_cookie;
int64_t last_ust, ns_frame, last_msc, next_msc, skew_msc;
int64_t last_ust, ns_frame, last_msc, next_msc;
};
static const unsigned int attachments[1] = { XCB_DRI2_ATTACHMENT_BUFFER_BACK_LEFT };
@ -81,9 +81,6 @@ vl_dri2_handle_stamps(struct vl_dri_screen* scrn,
if (scrn->last_ust && scrn->last_msc && (ust > scrn->last_ust) && (msc > scrn->last_msc))
scrn->ns_frame = (ust - scrn->last_ust) / (msc - scrn->last_msc);
if (scrn->next_msc && (scrn->next_msc < msc))
scrn->skew_msc++;
scrn->last_ust = ust;
scrn->last_msc = msc;
}
@ -282,7 +279,7 @@ vl_screen_set_next_timestamp(struct vl_screen *vscreen, uint64_t stamp)
struct vl_dri_screen *scrn = (struct vl_dri_screen*)vscreen;
assert(scrn);
if (stamp && scrn->last_ust && scrn->ns_frame && scrn->last_msc)
scrn->next_msc = ((int64_t)stamp - scrn->last_ust) / scrn->ns_frame + scrn->last_msc + scrn->skew_msc;
scrn->next_msc = ((int64_t)stamp - scrn->last_ust + scrn->ns_frame/2) / scrn->ns_frame + scrn->last_msc;
else
scrn->next_msc = 0;
}