Re: [PATCH v2 5/6] [media] s5p-jpeg: Add support for resolution change event

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



Hi Andrzej,

On 16/06/2017 17:38, Andrzej Pietrasiewicz wrote:
Hi Thierry,

Thank you for the patch.

Can you give a use case for resolution change event?
Unfortunately, the original commit does not mention any clear use case. I've asked to the patch author for more information.

Also plase see inline.

W dniu 12.06.2017 o 19:13, Thierry Escande pisze:
From: henryhsu <henryhsu@xxxxxxxxxxxx>
@@ -1611,8 +1612,6 @@ static int s5p_jpeg_s_fmt(struct s5p_jpeg_ctx *ct, struct v4l2_format *f)
              FMT_TYPE_OUTPUT : FMT_TYPE_CAPTURE;
      q_data->fmt = s5p_jpeg_find_format(ct, pix->pixelformat, f_type);
-    q_data->w = pix->width;
-    q_data->h = pix->height;
      if (q_data->fmt->fourcc != V4L2_PIX_FMT_JPEG) {
          /*
           * During encoding Exynos4x12 SoCs access wider memory area
@@ -1620,6 +1619,8 @@ static int s5p_jpeg_s_fmt(struct s5p_jpeg_ctx *ct, struct v4l2_format *f)
           * the JPEG_IMAGE_SIZE register. In order to avoid sysmmu
           * page fault calculate proper buffer size in such a case.
           */
+        q_data->w = pix->width;
+        q_data->h = pix->height;

Is this change related to what the patch is supposed to be doing?
Yes actually. From the author comments to the same question:
"We want to send a resolution change in the first frame. Without this, q_data->w and h will be updated by s_fmt. Then we won't know the resolution is changed from (0, 0) to (w, h) in qbuf function."

  static void s5p_jpeg_buf_queue(struct vb2_buffer *vb)
  {
      struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
@@ -2499,9 +2545,20 @@ static void s5p_jpeg_buf_queue(struct vb2_buffer *vb)
      if (ctx->mode == S5P_JPEG_DECODE &&
          vb->vb2_queue->type == V4L2_BUF_TYPE_VIDEO_OUTPUT) {
-        struct s5p_jpeg_q_data tmp, *q_data;
-
-        ctx->hdr_parsed = s5p_jpeg_parse_hdr(&tmp,
+        static const struct v4l2_event ev_src_ch = {
+            .type = V4L2_EVENT_SOURCE_CHANGE,
+            .u.src_change.changes = V4L2_EVENT_SRC_CH_RESOLUTION,
+        };
+        struct vb2_queue *dst_vq;
+        u32 ori_w;
+        u32 ori_h;
+
+        dst_vq = v4l2_m2m_get_vq(ctx->fh.m2m_ctx,
+                     V4L2_BUF_TYPE_VIDEO_CAPTURE);
+        ori_w = ctx->out_q.w;
+        ori_h = ctx->out_q.h;
+
+        ctx->hdr_parsed = s5p_jpeg_parse_hdr(&ctx->out_q,
               (unsigned long)vb2_plane_vaddr(vb, 0),
               min((unsigned long)ctx->out_q.size,
               vb2_get_plane_payload(vb, 0)), ctx);
@@ -2510,43 +2567,18 @@ static void s5p_jpeg_buf_queue(struct vb2_buffer *vb)
              return;
          }
-        q_data = &ctx->out_q;
-        q_data->w = tmp.w;
-        q_data->h = tmp.h;
-        q_data->sos = tmp.sos;
-        memcpy(q_data->dht.marker, tmp.dht.marker,
-               sizeof(tmp.dht.marker));
-        memcpy(q_data->dht.len, tmp.dht.len, sizeof(tmp.dht.len));
-        q_data->dht.n = tmp.dht.n;
-        memcpy(q_data->dqt.marker, tmp.dqt.marker,
-               sizeof(tmp.dqt.marker));
-        memcpy(q_data->dqt.len, tmp.dqt.len, sizeof(tmp.dqt.len));
-        q_data->dqt.n = tmp.dqt.n;
-        q_data->sof = tmp.sof;
-        q_data->sof_len = tmp.sof_len;
-
-        q_data = &ctx->cap_q;
-        q_data->w = tmp.w;
-        q_data->h = tmp.h;


Why is this part removed?
This has not been removed.
The &tmp s5p_jpeg_q_data struct was passed to s5p_jpeg_parse_hdr() and then copied field-by-field into ctx->out_q (through q_data pointer). With this change ctx->out_q is passed to s5p_jpeg_parse_hdr() and this avoids the copy. Then ctx->cap_q width & height copy is done in s5p_jpeg_set_capture_queue_data().

Regards,
 Thierry



[Index of Archives]     [Linux Input]     [Video for Linux]     [Gstreamer Embedded]     [Mplayer Users]     [Linux USB Devel]     [Linux Audio Users]     [Linux Kernel]     [Linux SCSI]     [Yosemite Backpacking]
  Powered by Linux