linux-kernel - [PATCH v2 1/8] videobuf2: Introduce vb2_find

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Date:   Mon, 11 Jul 2022 18:11:34 -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 v2 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>
Acked-by: Tomasz Figa <tfiga@...omium.org>
---
 drivers/media/common/videobuf2/videobuf2-v4l2.c | 12 ++++++++++++
 include/media/videobuf2-v4l2.h                  | 10 ++++++++++
 2 files changed, 22 insertions(+)

diff --git a/drivers/media/common/videobuf2/videobuf2-v4l2.c b/drivers/media/common/videobuf2/videobuf2-v4l2.c
index 075d24ebf44c..f26cb8586bd4 100644
--- a/drivers/media/common/videobuf2/videobuf2-v4l2.c
+++ b/drivers/media/common/videobuf2/videobuf2-v4l2.c
@@ -638,6 +638,18 @@ int vb2_find_timestamp(const struct vb2_queue *q, u64 timestamp,
 }
 EXPORT_SYMBOL_GPL(vb2_find_timestamp);
 
+struct vb2_buffer *vb2_find_buffer(struct vb2_queue *q, u64 timestamp)
+{
+	unsigned int i;
+
+	for (i = 0; i < q->num_buffers; i++)
+		if (q->bufs[i]->copied_timestamp &&
+		    q->bufs[i]->timestamp == timestamp)
+			return vb2_get_buffer(q, i);
+	return NULL;
+}
+EXPORT_SYMBOL_GPL(vb2_find_buffer);
+
 /*
  * vb2_querybuf() - query video buffer information
  * @q:		videobuf queue
diff --git a/include/media/videobuf2-v4l2.h b/include/media/videobuf2-v4l2.h
index d818d9707695..76e405c0b003 100644
--- a/include/media/videobuf2-v4l2.h
+++ b/include/media/videobuf2-v4l2.h
@@ -78,6 +78,16 @@ 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.
+ */
+struct vb2_buffer *vb2_find_buffer(struct vb2_queue *q, u64 timestamp);
+
 int vb2_querybuf(struct vb2_queue *q, struct v4l2_buffer *b);
 
 /**
-- 
2.34.3