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authorGabriel Francisco Mandaji <gfmandaji@gmail.com>2018-12-02 16:45:38 +0300
committerMauro Carvalho Chehab <mchehab+samsung@kernel.org>2018-12-07 16:30:33 +0300
commitbe7e3c3684e0790a84d25b3a7b70b434342e1cc3 (patch)
treeb985da7d825f62dae7c32255a2ca4b4b19854800 /drivers/media
parenta383096c98b4b44151a9fde106b01500ccc2a060 (diff)
downloadlinux-be7e3c3684e0790a84d25b3a7b70b434342e1cc3.tar.xz
media: vivid: Improve timestamping
Simulate a more precise timestamp by calculating it based on the current framerate. Signed-off-by: Gabriel Francisco Mandaji <gfmandaji@gmail.com> Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl> [hverkuil-cisco@xs4all.nl: replaced division by 2 with bit shift] Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
Diffstat (limited to 'drivers/media')
-rw-r--r--drivers/media/platform/vivid/vivid-core.h3
-rw-r--r--drivers/media/platform/vivid/vivid-kthread-cap.c51
-rw-r--r--drivers/media/platform/vivid/vivid-vbi-cap.c4
3 files changed, 40 insertions, 18 deletions
diff --git a/drivers/media/platform/vivid/vivid-core.h b/drivers/media/platform/vivid/vivid-core.h
index a4ff8547f79d..6697c7009629 100644
--- a/drivers/media/platform/vivid/vivid-core.h
+++ b/drivers/media/platform/vivid/vivid-core.h
@@ -394,6 +394,9 @@ struct vivid_dev {
/* thread for generating video capture stream */
struct task_struct *kthread_vid_cap;
unsigned long jiffies_vid_cap;
+ u64 cap_stream_start;
+ u64 cap_frame_period;
+ u64 cap_frame_eof_offset;
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 46e46e34a9e5..f8006a30c12f 100644
--- a/drivers/media/platform/vivid/vivid-kthread-cap.c
+++ b/drivers/media/platform/vivid/vivid-kthread-cap.c
@@ -425,12 +425,6 @@ static void vivid_fillbuff(struct vivid_dev *dev, struct vivid_buffer *buf)
is_loop = true;
buf->vb.sequence = dev->vid_cap_seq_count;
- /*
- * Take the timestamp now if the timestamp source is set to
- * "Start of Exposure".
- */
- if (dev->tstamp_src_is_soe)
- buf->vb.vb2_buf.timestamp = ktime_get_ns();
if (dev->field_cap == V4L2_FIELD_ALTERNATE) {
/*
* 60 Hz standards start with the bottom field, 50 Hz standards
@@ -554,14 +548,6 @@ 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 (!dev->tstamp_src_is_soe)
- buf->vb.vb2_buf.timestamp = ktime_get_ns();
- buf->vb.vb2_buf.timestamp += dev->time_wrap_offset;
}
/*
@@ -667,10 +653,28 @@ static void vivid_overlay(struct vivid_dev *dev, struct vivid_buffer *buf)
}
}
+static void vivid_cap_update_frame_period(struct vivid_dev *dev)
+{
+ u64 f_period;
+
+ f_period = (u64)dev->timeperframe_vid_cap.numerator * 1000000000;
+ do_div(f_period, dev->timeperframe_vid_cap.denominator);
+ if (dev->field_cap == V4L2_FIELD_ALTERNATE)
+ f_period >>= 1;
+ /*
+ * If "End of Frame", then offset the exposure time by 0.9
+ * of the frame period.
+ */
+ dev->cap_frame_eof_offset = f_period * 9;
+ do_div(dev->cap_frame_eof_offset, 10);
+ dev->cap_frame_period = f_period;
+}
+
static void vivid_thread_vid_cap_tick(struct vivid_dev *dev, int dropped_bufs)
{
struct vivid_buffer *vid_cap_buf = NULL;
struct vivid_buffer *vbi_cap_buf = NULL;
+ u64 f_time = 0;
dprintk(dev, 1, "Video Capture Thread Tick\n");
@@ -702,6 +706,11 @@ static void vivid_thread_vid_cap_tick(struct vivid_dev *dev, int dropped_bufs)
if (!vid_cap_buf && !vbi_cap_buf)
goto update_mv;
+ f_time = dev->cap_frame_period * dev->vid_cap_seq_count +
+ dev->cap_stream_start + dev->time_wrap_offset;
+ if (!dev->tstamp_src_is_soe)
+ f_time += dev->cap_frame_eof_offset;
+
if (vid_cap_buf) {
v4l2_ctrl_request_setup(vid_cap_buf->vb.vb2_buf.req_obj.req,
&dev->ctrl_hdl_vid_cap);
@@ -721,9 +730,13 @@ static void vivid_thread_vid_cap_tick(struct vivid_dev *dev, int dropped_bufs)
VB2_BUF_STATE_ERROR : VB2_BUF_STATE_DONE);
dprintk(dev, 2, "vid_cap buffer %d done\n",
vid_cap_buf->vb.vb2_buf.index);
+
+ vid_cap_buf->vb.vb2_buf.timestamp = f_time;
}
if (vbi_cap_buf) {
+ u64 vbi_period;
+
v4l2_ctrl_request_setup(vbi_cap_buf->vb.vb2_buf.req_obj.req,
&dev->ctrl_hdl_vbi_cap);
if (dev->stream_sliced_vbi_cap)
@@ -736,6 +749,11 @@ static void vivid_thread_vid_cap_tick(struct vivid_dev *dev, int dropped_bufs)
VB2_BUF_STATE_ERROR : VB2_BUF_STATE_DONE);
dprintk(dev, 2, "vbi_cap %d done\n",
vbi_cap_buf->vb.vb2_buf.index);
+
+ /* If capturing a VBI, offset by 0.05 */
+ vbi_period = dev->cap_frame_period * 5;
+ do_div(vbi_period, 100);
+ vbi_cap_buf->vb.vb2_buf.timestamp = f_time + vbi_period;
}
dev->dqbuf_error = false;
@@ -767,6 +785,8 @@ 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();
+ vivid_cap_update_frame_period(dev);
for (;;) {
try_to_freeze();
@@ -779,6 +799,9 @@ static int vivid_thread_vid_cap(void *data)
dev->jiffies_vid_cap = cur_jiffies;
dev->cap_seq_offset = dev->cap_seq_count + 1;
dev->cap_seq_count = 0;
+ dev->cap_stream_start += dev->cap_frame_period *
+ dev->cap_seq_offset;
+ vivid_cap_update_frame_period(dev);
dev->cap_seq_resync = false;
}
numerator = dev->timeperframe_vid_cap.numerator;
diff --git a/drivers/media/platform/vivid/vivid-vbi-cap.c b/drivers/media/platform/vivid/vivid-vbi-cap.c
index 903cebeb5ce5..17aa4b0cb246 100644
--- a/drivers/media/platform/vivid/vivid-vbi-cap.c
+++ b/drivers/media/platform/vivid/vivid-vbi-cap.c
@@ -95,8 +95,6 @@ void vivid_raw_vbi_cap_process(struct vivid_dev *dev, struct vivid_buffer *buf)
if (!VIVID_INVALID_SIGNAL(dev->std_signal_mode))
vivid_vbi_gen_raw(&dev->vbi_gen, &vbi, vbuf);
-
- buf->vb.vb2_buf.timestamp = ktime_get_ns() + dev->time_wrap_offset;
}
@@ -119,8 +117,6 @@ void vivid_sliced_vbi_cap_process(struct vivid_dev *dev,
for (i = 0; i < 25; i++)
vbuf[i] = dev->vbi_gen.data[i];
}
-
- buf->vb.vb2_buf.timestamp = ktime_get_ns() + dev->time_wrap_offset;
}
static int vbi_cap_queue_setup(struct vb2_queue *vq,