linux-kernel - [PATCH 1/8] videobuf2: Introduce vb2_find

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Date:   Wed,  6 Jul 2022 15:26:50 -0300
From:   Ezequiel Garcia <ezequiel@...guardiasur.com.ar>
To:     linux-media@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Hans Verkuil <hverkuil-cisco@...all.nl>,
        Tomasz Figa <tfiga@...omium.org>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Ezequiel Garcia <ezequiel@...labora.com>
Subject: [PATCH 1/8] videobuf2: Introduce vb2_find_buffer()

From: Ezequiel Garcia <ezequiel@...labora.com>

All users of vb2_find_timestamp() combine it with vb2_get_buffer()
to retrieve a videobuf2 buffer, given a u64 timestamp.

Introduce an API for this use-case. Users will be converted to the new
API as follow-up commits.

Signed-off-by: Ezequiel Garcia <ezequiel@...labora.com>
---
 include/media/videobuf2-v4l2.h | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/include/media/videobuf2-v4l2.h b/include/media/videobuf2-v4l2.h
index d818d9707695..7f9ae5b39b78 100644
--- a/include/media/videobuf2-v4l2.h
+++ b/include/media/videobuf2-v4l2.h
@@ -78,6 +78,24 @@ struct vb2_v4l2_buffer {
 int vb2_find_timestamp(const struct vb2_queue *q, u64 timestamp,
 		       unsigned int start_idx);
 
+/**
+ * vb2_find_buffer() - Find a buffer with given timestamp
+ *
+ * @q:		pointer to &struct vb2_queue with videobuf2 queue.
+ * @timestamp:	the timestamp to find.
+ *
+ * Returns the buffer with the given @timestamp, or NULL if not found.
+ */
+static inline struct vb2_buffer *vb2_find_buffer(struct vb2_queue *q,
+						 u64 timestamp)
+{
+	int index = vb2_find_timestamp(q, timestamp, 0);
+
+	if (index < 0)
+		return NULL;
+	return vb2_get_buffer(q, index);
+}
+
 int vb2_querybuf(struct vb2_queue *q, struct v4l2_buffer *b);
 
 /**
-- 
2.34.3