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51fa6a2656
Unfortunately streamoff does not flush the events, and this can cause all sort of issues. Flush events on capture queue. We also return GST_V4L2_FLOW_RESOLUTION_CHANGE in case a resolution change was seen. This allow skipping streamon(capture) on flush, which could lead to a configuration miss-match, or failure if the buffers aren't of the right size. Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/4437>
126 lines
4.6 KiB
C
126 lines
4.6 KiB
C
/* GStreamer
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*
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* Copyright (C) 2001-2002 Ronald Bultje <rbultje@ronald.bitfreak.net>
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* 2006 Edgard Lima <edgard.lima@gmail.com>
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* 2009 Texas Instruments, Inc - http://www.ti.com/
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*
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* gstv4l2bufferpool.h V4L2 buffer pool class
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*/
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#ifndef __GST_V4L2_BUFFER_POOL_H__
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#define __GST_V4L2_BUFFER_POOL_H__
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#include <gst/gst.h>
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typedef struct _GstV4l2BufferPool GstV4l2BufferPool;
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typedef struct _GstV4l2BufferPoolClass GstV4l2BufferPoolClass;
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typedef struct _GstV4l2Meta GstV4l2Meta;
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#include "gstv4l2object.h"
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#include "gstv4l2allocator.h"
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G_BEGIN_DECLS
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#define GST_TYPE_V4L2_BUFFER_POOL (gst_v4l2_buffer_pool_get_type())
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#define GST_IS_V4L2_BUFFER_POOL(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), GST_TYPE_V4L2_BUFFER_POOL))
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#define GST_V4L2_BUFFER_POOL(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), GST_TYPE_V4L2_BUFFER_POOL, GstV4l2BufferPool))
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#define GST_V4L2_BUFFER_POOL_CAST(obj) ((GstV4l2BufferPool*)(obj))
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/* Returns true if the pool is streaming. Must be called with stream lock
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* held. */
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#define GST_V4L2_BUFFER_POOL_IS_STREAMING(obj) (GST_V4L2_BUFFER_POOL (obj)->streaming)
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/* This flow return is used to indicate that the last buffer has been dequeued
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* during draining. This should normally only occur for mem-2-mem devices. */
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#define GST_V4L2_FLOW_LAST_BUFFER GST_FLOW_CUSTOM_SUCCESS
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/* This flow return is used to indicated that the returned buffer was marked
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* with the error flag and had no payload. This error should be recovered by
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* simply waiting for next buffer. */
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#define GST_V4L2_FLOW_CORRUPTED_BUFFER GST_FLOW_CUSTOM_SUCCESS_1
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/* This flow return is used to indicate that a SOURCE_CHANGE event with the
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* resolution change flag set was received. */
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#define GST_V4L2_FLOW_RESOLUTION_CHANGE GST_FLOW_CUSTOM_SUCCESS_2
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struct _GstV4l2BufferPool
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{
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GstBufferPool parent;
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GstV4l2Object *obj; /* the v4l2 object */
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gint video_fd; /* a dup(2) of the v4l2object's video_fd */
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gboolean empty;
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GCond empty_cond;
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gboolean orphaned;
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GstV4l2Allocator *vallocator;
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GstAllocator *allocator;
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GstAllocationParams params;
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GstBufferPool *other_pool;
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guint size;
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GstVideoInfo caps_info; /* Default video information */
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gboolean add_videometa; /* set if video meta should be added */
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gboolean enable_copy_threshold; /* If copy_threshold should be set */
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guint min_latency; /* number of buffers we will hold */
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guint max_latency; /* number of buffers we can hold */
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guint num_queued; /* number of buffers queued in the driver */
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guint num_allocated; /* number of buffers allocated */
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guint copy_threshold; /* when our pool runs lower, start handing out copies */
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gboolean streaming;
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gboolean flushing;
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GstBuffer *buffers[VIDEO_MAX_FRAME];
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volatile gint buffer_state[VIDEO_MAX_FRAME];
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/* signal handlers */
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gulong group_released_handler;
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/* Control to warn only once on buggy feild driver bug */
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gboolean has_warned_on_buggy_field;
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};
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struct _GstV4l2BufferPoolClass
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{
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GstBufferPoolClass parent_class;
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};
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GType gst_v4l2_buffer_pool_get_type (void);
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GstBufferPool * gst_v4l2_buffer_pool_new (GstV4l2Object *obj, GstCaps *caps);
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GstFlowReturn gst_v4l2_buffer_pool_process (GstV4l2BufferPool * bpool, GstBuffer ** buf, guint32 * frame_number);
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void gst_v4l2_buffer_pool_set_other_pool (GstV4l2BufferPool * pool,
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GstBufferPool * other_pool);
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void gst_v4l2_buffer_pool_copy_at_threshold (GstV4l2BufferPool * pool,
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gboolean copy);
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GstFlowReturn gst_v4l2_buffer_pool_flush (GstV4l2Object * v4l2object);
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gboolean gst_v4l2_buffer_pool_orphan (GstV4l2Object * v4l2object);
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void gst_v4l2_buffer_pool_enable_resolution_change (GstV4l2BufferPool *self);
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G_END_DECLS
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#endif /*__GST_V4L2_BUFFER_POOL_H__ */
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