Simulate a more precise timestamp by calculating it based on the
current framerate.
Signed-off-by: Gabriel Francisco Mandaji <gfmand...@gmail.com>
---
drivers/media/platform/vivid/vivid-core.h | 1 +
drivers/media/platform/vivid/vivid-kthread-cap.c | 24 ++++++++++++++++--------
2 files changed, 17 insertions(+), 8 deletions(-)
diff --git a/drivers/media/platform/vivid/vivid-core.h
b/drivers/media/platform/vivid/vivid-core.h
index cd4c823..cbdadd8 100644
--- a/drivers/media/platform/vivid/vivid-core.h
+++ b/drivers/media/platform/vivid/vivid-core.h
@@ -384,6 +384,7 @@ struct vivid_dev {
/* thread for generating video capture stream */
struct task_struct *kthread_vid_cap;
unsigned long jiffies_vid_cap;
+ u64 cap_stream_start;
u32 cap_seq_offset;
u32 cap_seq_count;
bool cap_seq_resync;
diff --git a/drivers/media/platform/vivid/vivid-kthread-cap.c
b/drivers/media/platform/vivid/vivid-kthread-cap.c
index f06003b..0793b15 100644
--- a/drivers/media/platform/vivid/vivid-kthread-cap.c
+++ b/drivers/media/platform/vivid/vivid-kthread-cap.c
@@ -416,6 +416,7 @@ static void vivid_fillbuff(struct vivid_dev *dev, struct
vivid_buffer *buf)
char str[100];
s32 gain;
bool is_loop = false;
+ u64 soe_time = 0;
if (dev->loop_video && dev->can_loop_video &&
((vivid_is_svid_cap(dev) &&
@@ -426,11 +427,11 @@ static void vivid_fillbuff(struct vivid_dev *dev, struct
vivid_buffer *buf)
buf->vb.sequence = dev->vid_cap_seq_count;
/*
- * Take the timestamp now if the timestamp source is set to
- * "Start of Exposure".
+ * Store the current time to calculate the delta if source is set to
+ * "End of Frame".
*/
- if (dev->tstamp_src_is_soe)
- buf->vb.vb2_buf.timestamp = ktime_get_ns();
+ if (!dev->tstamp_src_is_soe)
+ soe_time = ktime_get_ns();
if (dev->field_cap == V4L2_FIELD_ALTERNATE) {
/*
* 60 Hz standards start with the bottom field, 50 Hz standards
@@ -556,12 +557,18 @@ static void vivid_fillbuff(struct vivid_dev *dev, struct
vivid_buffer *buf)
}
/*
- * If "End of Frame" is specified at the timestamp source, then take
- * the timestamp now.
+ * If "End of Frame", then calculate the "exposition time" and add
+ * it to the timestamp.
*/
if (!dev->tstamp_src_is_soe)
- buf->vb.vb2_buf.timestamp = ktime_get_ns();
- buf->vb.vb2_buf.timestamp += dev->time_wrap_offset;
+ soe_time = ktime_get_ns() - soe_time;
+ buf->vb.vb2_buf.timestamp = dev->timeperframe_vid_cap.numerator *
+ 1000000000 /
+ dev->timeperframe_vid_cap.denominator *
+ dev->vid_cap_seq_count +
+ dev->cap_stream_start +
+ soe_time +
+ dev->time_wrap_offset;
}
/*
@@ -759,6 +766,7 @@ static int vivid_thread_vid_cap(void *data)
dev->cap_seq_count = 0;
dev->cap_seq_resync = false;
dev->jiffies_vid_cap = jiffies;
+ dev->cap_stream_start = ktime_get_ns();
for (;;) {
try_to_freeze();
--
1.9.1
