media: v4l2-mem2mem: add try_en/decoder_cmd ioctl helpers

Most if not all codecs will need to implement these ioctls and
it is expected to be the same for all codecs. So add this to
the core v4l2-mem2mem framework so that this code can easily be
reused.

Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>

diff --git a/drivers/media/v4l2-core/v4l2-mem2mem.c b/drivers/media/v4l2-core/v4l2-mem2mem.c
index 3392833d95411232e5a36f3b9cdc7623c82174c1..498044a0cb4ecdd67f1ace604d73b8f519360ae0 100644 (file)
--- a/drivers/media/v4l2-core/v4l2-mem2mem.c
+++ b/drivers/media/v4l2-core/v4l2-mem2mem.c
@@ -1122,6 +1122,35 @@ int v4l2_m2m_ioctl_streamoff(struct file *file, void *priv,
 }
 EXPORT_SYMBOL_GPL(v4l2_m2m_ioctl_streamoff);
 
+int v4l2_m2m_ioctl_try_encoder_cmd(struct file *file, void *fh,
+                                  struct v4l2_encoder_cmd *ec)
+{
+       if (ec->cmd != V4L2_ENC_CMD_STOP && ec->cmd != V4L2_ENC_CMD_START)
+               return -EINVAL;
+
+       ec->flags = 0;
+       return 0;
+}
+EXPORT_SYMBOL_GPL(v4l2_m2m_ioctl_try_encoder_cmd);
+
+int v4l2_m2m_ioctl_try_decoder_cmd(struct file *file, void *fh,
+                                  struct v4l2_decoder_cmd *dc)
+{
+       if (dc->cmd != V4L2_DEC_CMD_STOP && dc->cmd != V4L2_DEC_CMD_START)
+               return -EINVAL;
+
+       dc->flags = 0;
+
+       if (dc->cmd == V4L2_DEC_CMD_STOP) {
+               dc->stop.pts = 0;
+       } else if (dc->cmd == V4L2_DEC_CMD_START) {
+               dc->start.speed = 0;
+               dc->start.format = V4L2_DEC_START_FMT_NONE;
+       }
+       return 0;
+}
+EXPORT_SYMBOL_GPL(v4l2_m2m_ioctl_try_decoder_cmd);
+
 /*
  * v4l2_file_operations helpers. It is assumed here same lock is used
  * for the output and the capture buffer queue.

diff --git a/include/media/v4l2-mem2mem.h b/include/media/v4l2-mem2mem.h
index bb3e63d6bd1aa13b8a8ed994fb3dcfc955fdd3ff..2e0c989266a7c32e88dd1242362ef77809d8ecd4 100644 (file)
--- a/include/media/v4l2-mem2mem.h
+++ b/include/media/v4l2-mem2mem.h
@@ -672,6 +672,10 @@ int v4l2_m2m_ioctl_streamon(struct file *file, void *fh,
                                enum v4l2_buf_type type);
 int v4l2_m2m_ioctl_streamoff(struct file *file, void *fh,
                                enum v4l2_buf_type type);
+int v4l2_m2m_ioctl_try_encoder_cmd(struct file *file, void *fh,
+                                  struct v4l2_encoder_cmd *ec);
+int v4l2_m2m_ioctl_try_decoder_cmd(struct file *file, void *fh,
+                                  struct v4l2_decoder_cmd *dc);
 int v4l2_m2m_fop_mmap(struct file *file, struct vm_area_struct *vma);
 __poll_t v4l2_m2m_fop_poll(struct file *file, poll_table *wait);