target/linux/brcm2708/patches-4.9/950-0196-BCM2835-V4L2-Ensure-H264-header-bytes-get-a-sensible.patch

   1 From 02ceda02182f6cb538be397b8d8f34b64a254559 Mon Sep 17 00:00:00 2001
   2 From: Dave Stevenson <dave.stevenson@raspberrypi.org>
   3 Date: Mon, 13 Feb 2017 11:10:50 +0000
   4 Subject: [PATCH] BCM2835-V4L2: Ensure H264 header bytes get a sensible
   5  timestamp
   6
   7 H264 header come off VC with 0 timestamps, which means they get a
   8 strange timestamp when processed with VC/kernel start times,
   9 particularly if used with the inline header option.
  10 Remember the last frame timestamp and use that if set, or otherwise
  11 use the kernel start time.
  12
  13 https://github.com/raspberrypi/linux/issues/1836
  14
  15 Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.org>
  16 ---
  17  drivers/media/platform/bcm2835/bcm2835-camera.c | 30 ++++++++++++++++++++++---
  18  drivers/media/platform/bcm2835/bcm2835-camera.h |  2 ++
  19  2 files changed, 29 insertions(+), 3 deletions(-)
  20
  21 --- a/drivers/media/platform/bcm2835/bcm2835-camera.c
  22 +++ b/drivers/media/platform/bcm2835/bcm2835-camera.c
  23 @@ -356,8 +356,13 @@ static void buffer_cb(struct vchiq_mmal_
  24                 }
  25         } else {
  26                 if (dev->capture.frame_count) {
  27 -                       if (dev->capture.vc_start_timestamp != -1 &&
  28 -                           pts != 0) {
  29 +                       if (dev->capture.vc_start_timestamp == -1) {
  30 +                               buf->vb.vb2_buf.timestamp = ktime_get_ns();
  31 +                               v4l2_dbg(1, bcm2835_v4l2_debug, &dev->v4l2_dev,
  32 +                                "Buffer time set as current time - %lld",
  33 +                                buf->vb.vb2_buf.timestamp);
  34 +
  35 +                       } else if(pts != 0) {
  36                                 struct timeval timestamp;
  37                                 s64 runtime_us = pts -
  38                                     dev->capture.vc_start_timestamp;
  39 @@ -390,10 +395,27 @@ static void buffer_cb(struct vchiq_mmal_
  40                                 buf->vb.vb2_buf.timestamp = timestamp.tv_sec * 1000000000ULL +
  41                                         timestamp.tv_usec * 1000ULL;
  42                         } else {
  43 -                               buf->vb.vb2_buf.timestamp = ktime_get_ns();
  44 +                               if (dev->capture.last_timestamp) {
  45 +                                       buf->vb.vb2_buf.timestamp = dev->capture.last_timestamp;
  46 +                                       v4l2_dbg(1, bcm2835_v4l2_debug, &dev->v4l2_dev,
  47 +                                        "Buffer time set as last timestamp - %lld",
  48 +                                        buf->vb.vb2_buf.timestamp);
  49 +                               }
  50 +                               else {
  51 +                                       buf->vb.vb2_buf.timestamp =
  52 +                                       dev->capture.kernel_start_ts.tv_sec  * 1000000000ULL +
  53 +                                       dev->capture.kernel_start_ts.tv_usec * 1000ULL;
  54 +                                       v4l2_dbg(1, bcm2835_v4l2_debug, &dev->v4l2_dev,
  55 +                                        "Buffer time set as start timestamp - %lld",
  56 +                                        buf->vb.vb2_buf.timestamp);
  57 +                               }
  58                         }
  59 +                       dev->capture.last_timestamp = buf->vb.vb2_buf.timestamp;
  60
  61                         vb2_set_plane_payload(&buf->vb.vb2_buf, 0, length);
  62 +                       v4l2_dbg(1, bcm2835_v4l2_debug, &dev->v4l2_dev,
  63 +                               "Buffer has ts %llu",
  64 +                               dev->capture.last_timestamp);
  65                         vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_DONE);
  66
  67                         if (mmal_flags & MMAL_BUFFER_HEADER_FLAG_EOS &&
  68 @@ -559,6 +581,8 @@ static int start_streaming(struct vb2_qu
  69                          "Start time %lld size %d\n",
  70                          dev->capture.vc_start_timestamp, parameter_size);
  71
  72 +       dev->capture.last_timestamp = 0;
  73 +
  74         v4l2_get_timestamp(&dev->capture.kernel_start_ts);
  75
  76         /* enable the camera port */
  77 --- a/drivers/media/platform/bcm2835/bcm2835-camera.h
  78 +++ b/drivers/media/platform/bcm2835/bcm2835-camera.h
  79 @@ -93,6 +93,8 @@ struct bm2835_mmal_dev {
  80                 s64         vc_start_timestamp;
  81                 /* Kernel start timestamp for streaming */
  82                 struct timeval kernel_start_ts;
  83 +               /* Timestamp of last frame */
  84 +               u64             last_timestamp;
  85
  86                 struct vchiq_mmal_port  *port; /* port being used for capture */
  87                 /* camera port being used for capture */