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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>
This commit is contained in:
Gabriel Francisco Mandaji 2018-12-02 08:45:38 -05:00 committed by Mauro Carvalho Chehab
parent a383096c98
commit be7e3c3684
3 changed files with 40 additions and 18 deletions
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3
drivers/media/platform/vivid/vivid-core.h
View File

@ -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;

51
drivers/media/platform/vivid/vivid-kthread-cap.c
View File

@ -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;

4
drivers/media/platform/vivid/vivid-vbi-cap.c
View File

@ -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,