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Commit ee1228cc authored by Hans Verkuil's avatar Hans Verkuil Committed by Mauro Carvalho Chehab
Browse files

media: v4l2-mem2mem: add v4l2_m2m_last_buf() 



This can be used to mark the last queued source buffer as the last
buffer.

Signed-off-by: default avatarHans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: default avatarMauro Carvalho Chehab <mchehab+samsung@kernel.org>
parent 62c3fce0

drivers/media/v4l2-core/v4l2-mem2mem.c

+18 −0
Original line number Diff line number Diff line
@@ -129,6 +129,24 @@ void *v4l2_m2m_next_buf(struct v4l2_m2m_queue_ctx *q_ctx) 
}

EXPORT_SYMBOL_GPL(v4l2_m2m_next_buf);



void *v4l2_m2m_last_buf(struct v4l2_m2m_queue_ctx *q_ctx)

{

	struct v4l2_m2m_buffer *b;

	unsigned long flags;



	spin_lock_irqsave(&q_ctx->rdy_spinlock, flags);



	if (list_empty(&q_ctx->rdy_queue)) {

		spin_unlock_irqrestore(&q_ctx->rdy_spinlock, flags);

		return NULL;

	}



	b = list_last_entry(&q_ctx->rdy_queue, struct v4l2_m2m_buffer, list);

	spin_unlock_irqrestore(&q_ctx->rdy_spinlock, flags);

	return &b->vb;

}

EXPORT_SYMBOL_GPL(v4l2_m2m_last_buf);



void *v4l2_m2m_buf_remove(struct v4l2_m2m_queue_ctx *q_ctx)

{

	struct v4l2_m2m_buffer *b;

include/media/v4l2-mem2mem.h

+29 −0
Original line number Diff line number Diff line
@@ -449,6 +449,35 @@ static inline void *v4l2_m2m_next_dst_buf(struct v4l2_m2m_ctx *m2m_ctx) 
	return v4l2_m2m_next_buf(&m2m_ctx->cap_q_ctx);

}



/**

 * v4l2_m2m_last_buf() - return last buffer from the list of ready buffers

 *

 * @q_ctx: pointer to struct @v4l2_m2m_queue_ctx

 */

void *v4l2_m2m_last_buf(struct v4l2_m2m_queue_ctx *q_ctx);



/**

 * v4l2_m2m_last_src_buf() - return last destination buffer from the list of

 * ready buffers

 *

 * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx

 */

static inline void *v4l2_m2m_last_src_buf(struct v4l2_m2m_ctx *m2m_ctx)

{

	return v4l2_m2m_last_buf(&m2m_ctx->out_q_ctx);

}



/**

 * v4l2_m2m_last_dst_buf() - return last destination buffer from the list of

 * ready buffers

 *

 * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx

 */

static inline void *v4l2_m2m_last_dst_buf(struct v4l2_m2m_ctx *m2m_ctx)

{

	return v4l2_m2m_last_buf(&m2m_ctx->cap_q_ctx);

}



/**

 * v4l2_m2m_for_each_dst_buf() - iterate over a list of destination ready

 * buffers