/* 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, <[email protected]>
* Marek Szyprowski, <[email protected]>
*/
#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
* @ignore_cap_streaming: If true, job_ready can be called even if the CAPTURE
* queue is not streaming. This allows firmware to
* analyze the bitstream header which arrives on the
* OUTPUT queue. The driver must implement the job_ready
* callback correctly to make sure that the requirements
* for actual decoding are met.
* @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;
bool ignore_cap_streaming;
/* 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 the video buffer, which will receive normal per-queue offsets
* and proper vb2 queue pointers. The differentiation is made outside
* vb2 by adding a predefined offset to buffers from one of the queues
* and subtracting it before passing it back to vb2. 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 vb2_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 vb2_queue_ops->ops->buf_queue, vb2_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)
{
unsigned int num_buf_rdy;
unsigned long flags;
spin_lock_irqsave(&m2m_ctx->out_q_ctx.rdy_spinlock, flags);
num_buf_rdy = m2m_ctx->out_q_ctx.num_rdy;
spin_unlock_irqrestore(&m2m_ctx->out_q_ctx.rdy_spinlock, flags);
return num_buf_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)
{
unsigned int num_buf_rdy;
unsigned long flags;
spin_lock_irqsave(&m2m_ctx->cap_q_ctx.rdy_spinlock, flags);
num_buf_rdy = m2m_ctx->cap_q_ctx.num_rdy;
spin_unlock_irqrestore(&m2m_ctx->cap_q_ctx.rdy_spinlock, flags);
return num_buf_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 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_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_remove_bufs(struct file *file, void *priv,
struct v4l2_remove_buffers *d);
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 */
Codebase Browser
linux