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[v13,1/8] media: v4l2: Add ignore_cap_streaming flag

Message ID 20230929-wave5_v13_media_master-v13-1-5ac60ccbf2ce@collabora.com
State Accepted
Commit 103d15bc20086820ce2c2af40a651529a87c9e3c
Headers show
Series [v13,1/8] media: v4l2: Add ignore_cap_streaming flag | expand

Commit Message

Sebastian Fricke Oct. 12, 2023, 11 a.m. UTC 
Add a new flag to 'struct v4l2_m2m_ctx' to toggle whether a CAPTURE queue
must be streaming in order to allow queuing OUTPUT jobs to the ready
queue. Currently, both queues (CAPTURE & OUTPUT) must be streaming in
order to add new jobs. This prevents firmware from analyzing the bitstream
header which arrives on the OUTPUT queue and performing an analysis of the
sequence to ensure that userspace prepares the CAPTURE queue correctly.

Signed-off-by: Sebastian Fricke <sebastian.fricke@collabora.com>
Signed-off-by: Nicolas Dufresne <nicolas.dufresne@collabora.com>
Signed-off-by: Deborah Brouwer <deborah.brouwer@collabora.com>
---
 include/media/v4l2-mem2mem.h | 7 +++++++
 1 file changed, 7 insertions(+)
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Patch

diff --git a/include/media/v4l2-mem2mem.h b/include/media/v4l2-mem2mem.h
index d6c8eb2b5201..1288fe364fab 100644
--- a/include/media/v4l2-mem2mem.h
+++ b/include/media/v4l2-mem2mem.h
@@ -84,6 +84,12 @@  struct v4l2_m2m_queue_ctx {
  * @last_src_buf: indicate the last source buffer for draining
  * @next_buf_last: next capture queud buffer will be tagged as last
  * @has_stopped: indicate the device has been stopped
+ * @ignore_cap_streaming: If true, job_ready can be called even if the CAPTURE
+ *			  queue is not streaming. This allows firmware to
+ *			  analyze the bitstream header which arrives on the
+ *			  OUTPUT queue. The driver must implement the job_ready
+ *			  callback correctly to make sure that the requirements
+ *			  for actual decoding are met.
  * @m2m_dev: opaque pointer to the internal data to handle M2M context
  * @cap_q_ctx: Capture (output to memory) queue context
  * @out_q_ctx: Output (input from memory) queue context
@@ -106,6 +112,7 @@  struct v4l2_m2m_ctx {
 	struct vb2_v4l2_buffer		*last_src_buf;
 	bool				next_buf_last;
 	bool				has_stopped;
+	bool				ignore_cap_streaming;
 
 	/* internal use only */
 	struct v4l2_m2m_dev		*m2m_dev;