diff options
| -rw-r--r-- | drivers/media/v4l2-core/v4l2-mem2mem.c | 18 | ||||
| -rw-r--r-- | include/media/v4l2-mem2mem.h | 29 |
2 files changed, 47 insertions, 0 deletions
diff --git a/drivers/media/v4l2-core/v4l2-mem2mem.c b/drivers/media/v4l2-core/v4l2-mem2mem.c index 4aeedb91594a..d9565ee44578 100644 --- a/drivers/media/v4l2-core/v4l2-mem2mem.c +++ b/drivers/media/v4l2-core/v4l2-mem2mem.c @@ -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; diff --git a/include/media/v4l2-mem2mem.h b/include/media/v4l2-mem2mem.h index d60d3060f762..d655720e16a1 100644 --- a/include/media/v4l2-mem2mem.h +++ b/include/media/v4l2-mem2mem.h @@ -450,6 +450,35 @@ static inline void *v4l2_m2m_next_dst_buf(struct v4l2_m2m_ctx *m2m_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 * |