OSCL-LXR linux-6.0.1/​include/​media/​v4l2-mem2mem.h	Source navigation Diff markup Identifier search General search
	Version: linux-6.0.1 spark-3.0.0 hadoop-3.2.0-src hadoop-3.3.0-src spark-2.4.7 linux-4.15.13 hadoop-2.7.4-src Revert   Change

 /* SPDX-License-Identifier: GPL-2.0-or-later */
 /*
  * Memory-to-memory device framework for Video for Linux 2.
  *
  * Helper functions for devices that use memory buffers for both source
  * and destination.
  *
  * Copyright (c) 2009 Samsung Electronics Co., Ltd.
  * Pawel Osciak, <pawel@osciak.com>
  * Marek Szyprowski, <m.szyprowski@samsung.com>
  */
 
 #ifndef _MEDIA_V4L2_MEM2MEM_H
 #define _MEDIA_V4L2_MEM2MEM_H
 
 #include <media/videobuf2-v4l2.h>
 
 /**
  * struct v4l2_m2m_ops - mem-to-mem device driver callbacks
  * @device_run: required. Begin the actual job (transaction) inside this
  *      callback.
  *      The job does NOT have to end before this callback returns
  *      (and it will be the usual case). When the job finishes,
  *      v4l2_m2m_job_finish() or v4l2_m2m_buf_done_and_job_finish()
  *      has to be called.
  * @job_ready:  optional. Should return 0 if the driver does not have a job
  *      fully prepared to run yet (i.e. it will not be able to finish a
  *      transaction without sleeping). If not provided, it will be
  *      assumed that one source and one destination buffer are all
  *      that is required for the driver to perform one full transaction.
  *      This method may not sleep.
  * @job_abort:  optional. Informs the driver that it has to abort the currently
  *      running transaction as soon as possible (i.e. as soon as it can
  *      stop the device safely; e.g. in the next interrupt handler),
  *      even if the transaction would not have been finished by then.
  *      After the driver performs the necessary steps, it has to call
  *      v4l2_m2m_job_finish() or v4l2_m2m_buf_done_and_job_finish() as
  *      if the transaction ended normally.
  *      This function does not have to (and will usually not) wait
  *      until the device enters a state when it can be stopped.
  */
 struct v4l2_m2m_ops {
     void (*device_run)(void *priv);
     int (*job_ready)(void *priv);
     void (*job_abort)(void *priv);
 };
 
 struct video_device;
 struct v4l2_m2m_dev;
 
 /**
  * struct v4l2_m2m_queue_ctx - represents a queue for buffers ready to be
  *  processed
  *
  * @q:      pointer to struct &vb2_queue
  * @rdy_queue:  List of V4L2 mem-to-mem queues
  * @rdy_spinlock: spin lock to protect the struct usage
  * @num_rdy:    number of buffers ready to be processed
  * @buffered:   is the queue buffered?
  *
  * Queue for buffers ready to be processed as soon as this
  * instance receives access to the device.
  */
 
 struct v4l2_m2m_queue_ctx {
     struct vb2_queue    q;
 
     struct list_head    rdy_queue;
     spinlock_t      rdy_spinlock;
     u8          num_rdy;
     bool            buffered;
 };
 
 /**
  * struct v4l2_m2m_ctx - Memory to memory context structure
  *
  * @q_lock: struct &mutex lock
  * @new_frame: valid in the device_run callback: if true, then this
  *      starts a new frame; if false, then this is a new slice
  *      for an existing frame. This is always true unless
  *      V4L2_BUF_CAP_SUPPORTS_M2M_HOLD_CAPTURE_BUF is set, which
  *      indicates slicing support.
  * @is_draining: indicates device is in draining phase
  * @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
  * @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
  * @queue: List of memory to memory contexts
  * @job_flags: Job queue flags, used internally by v4l2-mem2mem.c:
  *      %TRANS_QUEUED, %TRANS_RUNNING and %TRANS_ABORT.
  * @finished: Wait queue used to signalize when a job queue finished.
  * @priv: Instance private data
  *
  * The memory to memory context is specific to a file handle, NOT to e.g.
  * a device.
  */
 struct v4l2_m2m_ctx {
     /* optional cap/out vb2 queues lock */
     struct mutex            *q_lock;
 
     bool                new_frame;
 
     bool                is_draining;
     struct vb2_v4l2_buffer      *last_src_buf;
     bool                next_buf_last;
     bool                has_stopped;
 
     /* internal use only */
     struct v4l2_m2m_dev     *m2m_dev;
 
     struct v4l2_m2m_queue_ctx   cap_q_ctx;
 
     struct v4l2_m2m_queue_ctx   out_q_ctx;
 
     /* For device job queue */
     struct list_head        queue;
     unsigned long           job_flags;
     wait_queue_head_t       finished;
 
     void                *priv;
 };
 
 /**
  * struct v4l2_m2m_buffer - Memory to memory buffer
  *
  * @vb: pointer to struct &vb2_v4l2_buffer
  * @list: list of m2m buffers
  */
 struct v4l2_m2m_buffer {
     struct vb2_v4l2_buffer  vb;
     struct list_head    list;
 };
 
 /**
  * v4l2_m2m_get_curr_priv() - return driver private data for the currently
  * running instance or NULL if no instance is running
  *
  * @m2m_dev: opaque pointer to the internal data to handle M2M context
  */
 void *v4l2_m2m_get_curr_priv(struct v4l2_m2m_dev *m2m_dev);
 
 /**
  * v4l2_m2m_get_vq() - return vb2_queue for the given type
  *
  * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
  * @type: type of the V4L2 buffer, as defined by enum &v4l2_buf_type
  */
 struct vb2_queue *v4l2_m2m_get_vq(struct v4l2_m2m_ctx *m2m_ctx,
                        enum v4l2_buf_type type);
 
 /**
  * v4l2_m2m_try_schedule() - check whether an instance is ready to be added to
  * the pending job queue and add it if so.
  *
  * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
  *
  * There are three basic requirements an instance has to meet to be able to run:
  * 1) at least one source buffer has to be queued,
  * 2) at least one destination buffer has to be queued,
  * 3) streaming has to be on.
  *
  * If a queue is buffered (for example a decoder hardware ringbuffer that has
  * to be drained before doing streamoff), allow scheduling without v4l2 buffers
  * on that queue.
  *
  * There may also be additional, custom requirements. In such case the driver
  * should supply a custom callback (job_ready in v4l2_m2m_ops) that should
  * return 1 if the instance is ready.
  * An example of the above could be an instance that requires more than one
  * src/dst buffer per transaction.
  */
 void v4l2_m2m_try_schedule(struct v4l2_m2m_ctx *m2m_ctx);
 
 /**
  * v4l2_m2m_job_finish() - inform the framework that a job has been finished
  * and have it clean up
  *
  * @m2m_dev: opaque pointer to the internal data to handle M2M context
  * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
  *
  * Called by a driver to yield back the device after it has finished with it.
  * Should be called as soon as possible after reaching a state which allows
  * other instances to take control of the device.
  *
  * This function has to be called only after &v4l2_m2m_ops->device_run
  * callback has been called on the driver. To prevent recursion, it should
  * not be called directly from the &v4l2_m2m_ops->device_run callback though.
  */
 void v4l2_m2m_job_finish(struct v4l2_m2m_dev *m2m_dev,
              struct v4l2_m2m_ctx *m2m_ctx);
 
 /**
  * v4l2_m2m_buf_done_and_job_finish() - return source/destination buffers with
  * state and inform the framework that a job has been finished and have it
  * clean up
  *
  * @m2m_dev: opaque pointer to the internal data to handle M2M context
  * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
  * @state: vb2 buffer state passed to v4l2_m2m_buf_done().
  *
  * Drivers that set V4L2_BUF_CAP_SUPPORTS_M2M_HOLD_CAPTURE_BUF must use this
  * function instead of job_finish() to take held buffers into account. It is
  * optional for other drivers.
  *
  * This function removes the source buffer from the ready list and returns
  * it with the given state. The same is done for the destination buffer, unless
  * it is marked 'held'. In that case the buffer is kept on the ready list.
  *
  * After that the job is finished (see job_finish()).
  *
  * This allows for multiple output buffers to be used to fill in a single
  * capture buffer. This is typically used by stateless decoders where
  * multiple e.g. H.264 slices contribute to a single decoded frame.
  */
 void v4l2_m2m_buf_done_and_job_finish(struct v4l2_m2m_dev *m2m_dev,
                       struct v4l2_m2m_ctx *m2m_ctx,
                       enum vb2_buffer_state state);
 
 static inline void
 v4l2_m2m_buf_done(struct vb2_v4l2_buffer *buf, enum vb2_buffer_state state)
 {
     vb2_buffer_done(&buf->vb2_buf, state);
 }
 
 /**
  * v4l2_m2m_clear_state() - clear encoding/decoding state
  *
  * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
  */
 static inline void
 v4l2_m2m_clear_state(struct v4l2_m2m_ctx *m2m_ctx)
 {
     m2m_ctx->next_buf_last = false;
     m2m_ctx->is_draining = false;
     m2m_ctx->has_stopped = false;
 }
 
 /**
  * v4l2_m2m_mark_stopped() - set current encoding/decoding state as stopped
  *
  * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
  */
 static inline void
 v4l2_m2m_mark_stopped(struct v4l2_m2m_ctx *m2m_ctx)
 {
     m2m_ctx->next_buf_last = false;
     m2m_ctx->is_draining = false;
     m2m_ctx->has_stopped = true;
 }
 
 /**
  * v4l2_m2m_dst_buf_is_last() - return the current encoding/decoding session
  * draining management state of next queued capture buffer
  *
  * This last capture buffer should be tagged with V4L2_BUF_FLAG_LAST to notify
  * the end of the capture session.
  *
  * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
  */
 static inline bool
 v4l2_m2m_dst_buf_is_last(struct v4l2_m2m_ctx *m2m_ctx)
 {
     return m2m_ctx->is_draining && m2m_ctx->next_buf_last;
 }
 
 /**
  * v4l2_m2m_has_stopped() - return the current encoding/decoding session
  * stopped state
  *
  * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
  */
 static inline bool
 v4l2_m2m_has_stopped(struct v4l2_m2m_ctx *m2m_ctx)
 {
     return m2m_ctx->has_stopped;
 }
 
 /**
  * v4l2_m2m_is_last_draining_src_buf() - return the output buffer draining
  * state in the current encoding/decoding session
  *
  * This will identify the last output buffer queued before a session stop
  * was required, leading to an actual encoding/decoding session stop state
  * in the encoding/decoding process after being processed.
  *
  * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
  * @vbuf: pointer to struct &v4l2_buffer
  */
 static inline bool
 v4l2_m2m_is_last_draining_src_buf(struct v4l2_m2m_ctx *m2m_ctx,
                   struct vb2_v4l2_buffer *vbuf)
 {
     return m2m_ctx->is_draining && vbuf == m2m_ctx->last_src_buf;
 }
 
 /**
  * v4l2_m2m_last_buffer_done() - marks the buffer with LAST flag and DONE
  *
  * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
  * @vbuf: pointer to struct &v4l2_buffer
  */
 void v4l2_m2m_last_buffer_done(struct v4l2_m2m_ctx *m2m_ctx,
                    struct vb2_v4l2_buffer *vbuf);
 
 /**
  * v4l2_m2m_suspend() - stop new jobs from being run and wait for current job
  * to finish
  *
  * @m2m_dev: opaque pointer to the internal data to handle M2M context
  *
  * Called by a driver in the suspend hook. Stop new jobs from being run, and
  * wait for current running job to finish.
  */
 void v4l2_m2m_suspend(struct v4l2_m2m_dev *m2m_dev);
 
 /**
  * v4l2_m2m_resume() - resume job running and try to run a queued job
  *
  * @m2m_dev: opaque pointer to the internal data to handle M2M context
  *
  * Called by a driver in the resume hook. This reverts the operation of
  * v4l2_m2m_suspend() and allows job to be run. Also try to run a queued job if
  * there is any.
  */
 void v4l2_m2m_resume(struct v4l2_m2m_dev *m2m_dev);
 
 /**
  * v4l2_m2m_reqbufs() - multi-queue-aware REQBUFS multiplexer
  *
  * @file: pointer to struct &file
  * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
  * @reqbufs: pointer to struct &v4l2_requestbuffers
  */
 int v4l2_m2m_reqbufs(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
              struct v4l2_requestbuffers *reqbufs);
 
 /**
  * v4l2_m2m_querybuf() - multi-queue-aware QUERYBUF multiplexer
  *
  * @file: pointer to struct &file
  * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
  * @buf: pointer to struct &v4l2_buffer
  *
  * See v4l2_m2m_mmap() documentation for details.
  */
 int v4l2_m2m_querybuf(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
               struct v4l2_buffer *buf);
 
 /**
  * v4l2_m2m_qbuf() - enqueue a source or destination buffer, depending on
  * the type
  *
  * @file: pointer to struct &file
  * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
  * @buf: pointer to struct &v4l2_buffer
  */
 int v4l2_m2m_qbuf(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
           struct v4l2_buffer *buf);
 
 /**
  * v4l2_m2m_dqbuf() - dequeue a source or destination buffer, depending on
  * the type
  *
  * @file: pointer to struct &file
  * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
  * @buf: pointer to struct &v4l2_buffer
  */
 int v4l2_m2m_dqbuf(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
            struct v4l2_buffer *buf);
 
 /**
  * v4l2_m2m_prepare_buf() - prepare a source or destination buffer, depending on
  * the type
  *
  * @file: pointer to struct &file
  * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
  * @buf: pointer to struct &v4l2_buffer
  */
 int v4l2_m2m_prepare_buf(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
              struct v4l2_buffer *buf);
 
 /**
  * v4l2_m2m_create_bufs() - create a source or destination buffer, depending
  * on the type
  *
  * @file: pointer to struct &file
  * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
  * @create: pointer to struct &v4l2_create_buffers
  */
 int v4l2_m2m_create_bufs(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
              struct v4l2_create_buffers *create);
 
 /**
  * v4l2_m2m_expbuf() - export a source or destination buffer, depending on
  * the type
  *
  * @file: pointer to struct &file
  * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
  * @eb: pointer to struct &v4l2_exportbuffer
  */
 int v4l2_m2m_expbuf(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
            struct v4l2_exportbuffer *eb);
 
 /**
  * v4l2_m2m_streamon() - turn on streaming for a video queue
  *
  * @file: pointer to struct &file
  * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
  * @type: type of the V4L2 buffer, as defined by enum &v4l2_buf_type
  */
 int v4l2_m2m_streamon(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
               enum v4l2_buf_type type);
 
 /**
  * v4l2_m2m_streamoff() - turn off streaming for a video queue
  *
  * @file: pointer to struct &file
  * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
  * @type: type of the V4L2 buffer, as defined by enum &v4l2_buf_type
  */
 int v4l2_m2m_streamoff(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
                enum v4l2_buf_type type);
 
 /**
  * v4l2_m2m_update_start_streaming_state() - update the encoding/decoding
  * session state when a start of streaming of a video queue is requested
  *
  * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
  * @q: queue
  */
 void v4l2_m2m_update_start_streaming_state(struct v4l2_m2m_ctx *m2m_ctx,
                        struct vb2_queue *q);
 
 /**
  * v4l2_m2m_update_stop_streaming_state() -  update the encoding/decoding
  * session state when a stop of streaming of a video queue is requested
  *
  * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
  * @q: queue
  */
 void v4l2_m2m_update_stop_streaming_state(struct v4l2_m2m_ctx *m2m_ctx,
                       struct vb2_queue *q);
 
 /**
  * v4l2_m2m_encoder_cmd() - execute an encoder command
  *
  * @file: pointer to struct &file
  * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
  * @ec: pointer to the encoder command
  */
 int v4l2_m2m_encoder_cmd(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
              struct v4l2_encoder_cmd *ec);
 
 /**
  * v4l2_m2m_decoder_cmd() - execute a decoder command
  *
  * @file: pointer to struct &file
  * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
  * @dc: pointer to the decoder command
  */
 int v4l2_m2m_decoder_cmd(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
              struct v4l2_decoder_cmd *dc);
 
 /**
  * v4l2_m2m_poll() - poll replacement, for destination buffers only
  *
  * @file: pointer to struct &file
  * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
  * @wait: pointer to struct &poll_table_struct
  *
  * Call from the driver's poll() function. Will poll both queues. If a buffer
  * is available to dequeue (with dqbuf) from the source queue, this will
  * indicate that a non-blocking write can be performed, while read will be
  * returned in case of the destination queue.
  */
 __poll_t v4l2_m2m_poll(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
                struct poll_table_struct *wait);
 
 /**
  * v4l2_m2m_mmap() - source and destination queues-aware mmap multiplexer
  *
  * @file: pointer to struct &file
  * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
  * @vma: pointer to struct &vm_area_struct
  *
  * Call from driver's mmap() function. Will handle mmap() for both queues
  * seamlessly for videobuffer, which will receive normal per-queue offsets and
  * proper videobuf queue pointers. The differentiation is made outside videobuf
  * by adding a predefined offset to buffers from one of the queues and
  * subtracting it before passing it back to videobuf. Only drivers (and
  * thus applications) receive modified offsets.
  */
 int v4l2_m2m_mmap(struct file *file, struct v4l2_m2m_ctx *m2m_ctx,
           struct vm_area_struct *vma);
 
 #ifndef CONFIG_MMU
 unsigned long v4l2_m2m_get_unmapped_area(struct file *file, unsigned long addr,
                      unsigned long len, unsigned long pgoff,
                      unsigned long flags);
 #endif
 /**
  * v4l2_m2m_init() - initialize per-driver m2m data
  *
  * @m2m_ops: pointer to struct v4l2_m2m_ops
  *
  * Usually called from driver's ``probe()`` function.
  *
  * Return: returns an opaque pointer to the internal data to handle M2M context
  */
 struct v4l2_m2m_dev *v4l2_m2m_init(const struct v4l2_m2m_ops *m2m_ops);
 
 #if defined(CONFIG_MEDIA_CONTROLLER)
 void v4l2_m2m_unregister_media_controller(struct v4l2_m2m_dev *m2m_dev);
 int v4l2_m2m_register_media_controller(struct v4l2_m2m_dev *m2m_dev,
             struct video_device *vdev, int function);
 #else
 static inline void
 v4l2_m2m_unregister_media_controller(struct v4l2_m2m_dev *m2m_dev)
 {
 }
 
 static inline int
 v4l2_m2m_register_media_controller(struct v4l2_m2m_dev *m2m_dev,
         struct video_device *vdev, int function)
 {
     return 0;
 }
 #endif
 
 /**
  * v4l2_m2m_release() - cleans up and frees a m2m_dev structure
  *
  * @m2m_dev: opaque pointer to the internal data to handle M2M context
  *
  * Usually called from driver's ``remove()`` function.
  */
 void v4l2_m2m_release(struct v4l2_m2m_dev *m2m_dev);
 
 /**
  * v4l2_m2m_ctx_init() - allocate and initialize a m2m context
  *
  * @m2m_dev: opaque pointer to the internal data to handle M2M context
  * @drv_priv: driver's instance private data
  * @queue_init: a callback for queue type-specific initialization function
  *  to be used for initializing videobuf_queues
  *
  * Usually called from driver's ``open()`` function.
  */
 struct v4l2_m2m_ctx *v4l2_m2m_ctx_init(struct v4l2_m2m_dev *m2m_dev,
         void *drv_priv,
         int (*queue_init)(void *priv, struct vb2_queue *src_vq, struct vb2_queue *dst_vq));
 
 static inline void v4l2_m2m_set_src_buffered(struct v4l2_m2m_ctx *m2m_ctx,
                          bool buffered)
 {
     m2m_ctx->out_q_ctx.buffered = buffered;
 }
 
 static inline void v4l2_m2m_set_dst_buffered(struct v4l2_m2m_ctx *m2m_ctx,
                          bool buffered)
 {
     m2m_ctx->cap_q_ctx.buffered = buffered;
 }
 
 /**
  * v4l2_m2m_ctx_release() - release m2m context
  *
  * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
  *
  * Usually called from driver's release() function.
  */
 void v4l2_m2m_ctx_release(struct v4l2_m2m_ctx *m2m_ctx);
 
 /**
  * v4l2_m2m_buf_queue() - add a buffer to the proper ready buffers list.
  *
  * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
  * @vbuf: pointer to struct &vb2_v4l2_buffer
  *
  * Call from videobuf_queue_ops->ops->buf_queue, videobuf_queue_ops callback.
  */
 void v4l2_m2m_buf_queue(struct v4l2_m2m_ctx *m2m_ctx,
             struct vb2_v4l2_buffer *vbuf);
 
 /**
  * v4l2_m2m_num_src_bufs_ready() - return the number of source buffers ready for
  * use
  *
  * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
  */
 static inline
 unsigned int v4l2_m2m_num_src_bufs_ready(struct v4l2_m2m_ctx *m2m_ctx)
 {
     return m2m_ctx->out_q_ctx.num_rdy;
 }
 
 /**
  * v4l2_m2m_num_dst_bufs_ready() - return the number of destination buffers
  * ready for use
  *
  * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
  */
 static inline
 unsigned int v4l2_m2m_num_dst_bufs_ready(struct v4l2_m2m_ctx *m2m_ctx)
 {
     return m2m_ctx->cap_q_ctx.num_rdy;
 }
 
 /**
  * v4l2_m2m_next_buf() - return next buffer from the list of ready buffers
  *
  * @q_ctx: pointer to struct @v4l2_m2m_queue_ctx
  */
 struct vb2_v4l2_buffer *v4l2_m2m_next_buf(struct v4l2_m2m_queue_ctx *q_ctx);
 
 /**
  * v4l2_m2m_next_src_buf() - return next source buffer from the list of ready
  * buffers
  *
  * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
  */
 static inline struct vb2_v4l2_buffer *
 v4l2_m2m_next_src_buf(struct v4l2_m2m_ctx *m2m_ctx)
 {
     return v4l2_m2m_next_buf(&m2m_ctx->out_q_ctx);
 }
 
 /**
  * v4l2_m2m_next_dst_buf() - return next destination buffer from the list of
  * ready buffers
  *
  * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
  */
 static inline struct vb2_v4l2_buffer *
 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
  */
 struct vb2_v4l2_buffer *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 struct vb2_v4l2_buffer *
 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 struct vb2_v4l2_buffer *
 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
  *
  * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
  * @b: current buffer of type struct v4l2_m2m_buffer
  */
 #define v4l2_m2m_for_each_dst_buf(m2m_ctx, b)   \
     list_for_each_entry(b, &m2m_ctx->cap_q_ctx.rdy_queue, list)
 
 /**
  * v4l2_m2m_for_each_src_buf() - iterate over a list of source ready buffers
  *
  * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
  * @b: current buffer of type struct v4l2_m2m_buffer
  */
 #define v4l2_m2m_for_each_src_buf(m2m_ctx, b)   \
     list_for_each_entry(b, &m2m_ctx->out_q_ctx.rdy_queue, list)
 
 /**
  * v4l2_m2m_for_each_dst_buf_safe() - iterate over a list of destination ready
  * buffers safely
  *
  * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
  * @b: current buffer of type struct v4l2_m2m_buffer
  * @n: used as temporary storage
  */
 #define v4l2_m2m_for_each_dst_buf_safe(m2m_ctx, b, n)   \
     list_for_each_entry_safe(b, n, &m2m_ctx->cap_q_ctx.rdy_queue, list)
 
 /**
  * v4l2_m2m_for_each_src_buf_safe() - iterate over a list of source ready
  * buffers safely
  *
  * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
  * @b: current buffer of type struct v4l2_m2m_buffer
  * @n: used as temporary storage
  */
 #define v4l2_m2m_for_each_src_buf_safe(m2m_ctx, b, n)   \
     list_for_each_entry_safe(b, n, &m2m_ctx->out_q_ctx.rdy_queue, list)
 
 /**
  * v4l2_m2m_get_src_vq() - return vb2_queue for source buffers
  *
  * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
  */
 static inline
 struct vb2_queue *v4l2_m2m_get_src_vq(struct v4l2_m2m_ctx *m2m_ctx)
 {
     return &m2m_ctx->out_q_ctx.q;
 }
 
 /**
  * v4l2_m2m_get_dst_vq() - return vb2_queue for destination buffers
  *
  * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
  */
 static inline
 struct vb2_queue *v4l2_m2m_get_dst_vq(struct v4l2_m2m_ctx *m2m_ctx)
 {
     return &m2m_ctx->cap_q_ctx.q;
 }
 
 /**
  * v4l2_m2m_buf_remove() - take off a buffer from the list of ready buffers and
  * return it
  *
  * @q_ctx: pointer to struct @v4l2_m2m_queue_ctx
  */
 struct vb2_v4l2_buffer *v4l2_m2m_buf_remove(struct v4l2_m2m_queue_ctx *q_ctx);
 
 /**
  * v4l2_m2m_src_buf_remove() - take off a source buffer from the list of ready
  * buffers and return it
  *
  * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
  */
 static inline struct vb2_v4l2_buffer *
 v4l2_m2m_src_buf_remove(struct v4l2_m2m_ctx *m2m_ctx)
 {
     return v4l2_m2m_buf_remove(&m2m_ctx->out_q_ctx);
 }
 
 /**
  * v4l2_m2m_dst_buf_remove() - take off a destination buffer from the list of
  * ready buffers and return it
  *
  * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
  */
 static inline struct vb2_v4l2_buffer *
 v4l2_m2m_dst_buf_remove(struct v4l2_m2m_ctx *m2m_ctx)
 {
     return v4l2_m2m_buf_remove(&m2m_ctx->cap_q_ctx);
 }
 
 /**
  * v4l2_m2m_buf_remove_by_buf() - take off exact buffer from the list of ready
  * buffers
  *
  * @q_ctx: pointer to struct @v4l2_m2m_queue_ctx
  * @vbuf: the buffer to be removed
  */
 void v4l2_m2m_buf_remove_by_buf(struct v4l2_m2m_queue_ctx *q_ctx,
                 struct vb2_v4l2_buffer *vbuf);
 
 /**
  * v4l2_m2m_src_buf_remove_by_buf() - take off exact source buffer from the list
  * of ready buffers
  *
  * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
  * @vbuf: the buffer to be removed
  */
 static inline void v4l2_m2m_src_buf_remove_by_buf(struct v4l2_m2m_ctx *m2m_ctx,
                           struct vb2_v4l2_buffer *vbuf)
 {
     v4l2_m2m_buf_remove_by_buf(&m2m_ctx->out_q_ctx, vbuf);
 }
 
 /**
  * v4l2_m2m_dst_buf_remove_by_buf() - take off exact destination buffer from the
  * list of ready buffers
  *
  * @m2m_ctx: m2m context assigned to the instance given by struct &v4l2_m2m_ctx
  * @vbuf: the buffer to be removed
  */
 static inline void v4l2_m2m_dst_buf_remove_by_buf(struct v4l2_m2m_ctx *m2m_ctx,
                           struct vb2_v4l2_buffer *vbuf)
 {
     v4l2_m2m_buf_remove_by_buf(&m2m_ctx->cap_q_ctx, vbuf);
 }
 
 struct vb2_v4l2_buffer *
 v4l2_m2m_buf_remove_by_idx(struct v4l2_m2m_queue_ctx *q_ctx, unsigned int idx);
 
 static inline struct vb2_v4l2_buffer *
 v4l2_m2m_src_buf_remove_by_idx(struct v4l2_m2m_ctx *m2m_ctx, unsigned int idx)
 {
     return v4l2_m2m_buf_remove_by_idx(&m2m_ctx->out_q_ctx, idx);
 }
 
 static inline struct vb2_v4l2_buffer *
 v4l2_m2m_dst_buf_remove_by_idx(struct v4l2_m2m_ctx *m2m_ctx, unsigned int idx)
 {
     return v4l2_m2m_buf_remove_by_idx(&m2m_ctx->cap_q_ctx, idx);
 }
 
 /**
  * v4l2_m2m_buf_copy_metadata() - copy buffer metadata from
  * the output buffer to the capture buffer
  *
  * @out_vb: the output buffer that is the source of the metadata.
  * @cap_vb: the capture buffer that will receive the metadata.
  * @copy_frame_flags: copy the KEY/B/PFRAME flags as well.
  *
  * This helper function copies the timestamp, timecode (if the TIMECODE
  * buffer flag was set), field and the TIMECODE, KEYFRAME, BFRAME, PFRAME
  * and TSTAMP_SRC_MASK flags from @out_vb to @cap_vb.
  *
  * If @copy_frame_flags is false, then the KEYFRAME, BFRAME and PFRAME
  * flags are not copied. This is typically needed for encoders that
  * set this bits explicitly.
  */
 void v4l2_m2m_buf_copy_metadata(const struct vb2_v4l2_buffer *out_vb,
                 struct vb2_v4l2_buffer *cap_vb,
                 bool copy_frame_flags);
 
 /* v4l2 request helper */
 
 void v4l2_m2m_request_queue(struct media_request *req);
 
 /* v4l2 ioctl helpers */
 
 int v4l2_m2m_ioctl_reqbufs(struct file *file, void *priv,
                 struct v4l2_requestbuffers *rb);
 int v4l2_m2m_ioctl_create_bufs(struct file *file, void *fh,
                 struct v4l2_create_buffers *create);
 int v4l2_m2m_ioctl_querybuf(struct file *file, void *fh,
                 struct v4l2_buffer *buf);
 int v4l2_m2m_ioctl_expbuf(struct file *file, void *fh,
                 struct v4l2_exportbuffer *eb);
 int v4l2_m2m_ioctl_qbuf(struct file *file, void *fh,
                 struct v4l2_buffer *buf);
 int v4l2_m2m_ioctl_dqbuf(struct file *file, void *fh,
                 struct v4l2_buffer *buf);
 int v4l2_m2m_ioctl_prepare_buf(struct file *file, void *fh,
                    struct v4l2_buffer *buf);
 int v4l2_m2m_ioctl_streamon(struct file *file, void *fh,
                 enum v4l2_buf_type type);
 int v4l2_m2m_ioctl_streamoff(struct file *file, void *fh,
                 enum v4l2_buf_type type);
 int v4l2_m2m_ioctl_encoder_cmd(struct file *file, void *fh,
                    struct v4l2_encoder_cmd *ec);
 int v4l2_m2m_ioctl_decoder_cmd(struct file *file, void *fh,
                    struct v4l2_decoder_cmd *dc);
 int v4l2_m2m_ioctl_try_encoder_cmd(struct file *file, void *fh,
                    struct v4l2_encoder_cmd *ec);
 int v4l2_m2m_ioctl_try_decoder_cmd(struct file *file, void *fh,
                    struct v4l2_decoder_cmd *dc);
 int v4l2_m2m_ioctl_stateless_try_decoder_cmd(struct file *file, void *fh,
                          struct v4l2_decoder_cmd *dc);
 int v4l2_m2m_ioctl_stateless_decoder_cmd(struct file *file, void *priv,
                      struct v4l2_decoder_cmd *dc);
 int v4l2_m2m_fop_mmap(struct file *file, struct vm_area_struct *vma);
 __poll_t v4l2_m2m_fop_poll(struct file *file, poll_table *wait);
 
 #endif /* _MEDIA_V4L2_MEM2MEM_H */
 

This page was automatically generated by the 2.1.0 LXR engine. The LXR team