[FFmpeg-devel] [PATCH v5 3/7] avcodec/v4l2_context: add v4l2_start_decode

[Ming Qian <ming.qian@nxp.com>]

on dynamic resolution change,
The decoding process must be resumed with either a pair of calls to
VIDIOC_STREAMOFF() and VIDIOC_STREAMON() on the CAPTURE queue, or a call
to VIDIOC_DECODER_CMD() with the V4L2_DEC_CMD_START command.

Signed-off-by: Ming Qian <ming.qian@nxp.com>
---
 libavcodec/v4l2_context.c | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/libavcodec/v4l2_context.c b/libavcodec/v4l2_context.c
index dda5157698c3..a181f884d2a6 100644
--- a/libavcodec/v4l2_context.c
+++ b/libavcodec/v4l2_context.c
@@ -153,6 +153,21 @@ static inline void v4l2_save_to_context(V4L2Context* ctx, struct v4l2_format_upd
     }
 }
 
+static int v4l2_start_decode(V4L2Context *ctx)
+{
+    struct v4l2_decoder_cmd cmd = {
+        .cmd = V4L2_DEC_CMD_START,
+        .flags = 0,
+    };
+    int ret;
+
+    ret = ioctl(ctx_to_m2mctx(ctx)->fd, VIDIOC_DECODER_CMD, &cmd);
+    if (ret)
+        return AVERROR(errno);
+
+    return 0;
+}
+
 /**
  * handle resolution change event and end of stream event
  * returns 1 if reinit was successful, negative if it failed
@@ -190,6 +205,9 @@ static int v4l2_handle_event(V4L2Context *ctx)
         s->capture.height = v4l2_get_height(&cap_fmt);
         s->capture.width = v4l2_get_width(&cap_fmt);
         s->capture.sample_aspect_ratio = v4l2_get_sar(&s->capture);
+    } else {
+        v4l2_start_decode(ctx);
+        return 0;
     }
 
     if (reinit)
-- 
2.33.0

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