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video: support allocate multi plane in one gstbuffer

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in this modification, a `GST_BUFFER_POOL_OPTION_VIDEO_MULTI_PLANE`
option has been added. When this option is enabled, if the requested
format `GST_VIDEO_INFO_N_PLANES` is greater than 1, each plane will be
individually created as a `GstMemory` and then encapsulated into a
`GstBuffer`.

This change is very useful when the driver requires data from multiple
planes. such as v4l2 elements, driver expected multi gstmemory in
one gstbuffer, and each gstmemory contain a dma fd.
This commit is contained in:
Qian Hu (胡骞) 2024-04-19 21:01:56 +08:00
parent 802b27ca04
commit 54c5d689ec
2 changed files with 58 additions and 5 deletions
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55
subprojects/gst-plugins-base/gst-libs/gst/video/gstvideopool.c
View file

@ -101,6 +101,7 @@ struct _GstVideoBufferPoolPrivate
GstVideoAlignment video_align;
gboolean add_videometa;
gboolean need_alignment;
gboolean multi_plane;
GstAllocator *allocator;
GstAllocationParams params;
};
@ -115,7 +116,8 @@ static const gchar **
video_buffer_pool_get_options (GstBufferPool * pool)
{
static const gchar *options[] = { GST_BUFFER_POOL_OPTION_VIDEO_META,
GST_BUFFER_POOL_OPTION_VIDEO_ALIGNMENT, NULL
GST_BUFFER_POOL_OPTION_VIDEO_ALIGNMENT,
GST_BUFFER_POOL_OPTION_VIDEO_MULTI_PLANE, NULL
};
return options;
}
@ -169,6 +171,10 @@ video_buffer_pool_set_config (GstBufferPool * pool, GstStructure * config)
priv->need_alignment = gst_buffer_pool_config_has_option (config,
GST_BUFFER_POOL_OPTION_VIDEO_ALIGNMENT);
/* parse multi plane info */
priv->multi_plane = gst_buffer_pool_config_has_option (config,
GST_BUFFER_POOL_OPTION_VIDEO_MULTI_PLANE);
if (priv->need_alignment && priv->add_videometa) {
guint max_align, n;
@ -235,6 +241,25 @@ failed_to_align:
}
}
static int
video_buffer_pool_get_plane_size (GstVideoInfo * info, int plane)
{
int plane_num = GST_VIDEO_INFO_N_PLANES (info);
gsize cur_offset = GST_VIDEO_INFO_PLANE_OFFSET (info, plane);
gsize next_offset = (plane == (plane_num - 1)) ?
GST_VIDEO_INFO_SIZE (info) :
GST_VIDEO_INFO_PLANE_OFFSET (info, plane + 1);
gsize plane_size = next_offset - cur_offset;
GST_DEBUG ("plane: %d size: %" G_GSIZE_FORMAT
" cur_offset: %" G_GSIZE_FORMAT
" next_offset: %" G_GSIZE_FORMAT,
plane, plane_size, cur_offset, next_offset);
return plane_size;
}
static GstFlowReturn
video_buffer_pool_alloc (GstBufferPool * pool, GstBuffer ** buffer,
GstBufferPoolAcquireParams * params)
@ -247,10 +272,30 @@ video_buffer_pool_alloc (GstBufferPool * pool, GstBuffer ** buffer,
GST_DEBUG_OBJECT (pool, "alloc %" G_GSIZE_FORMAT, info->size);
*buffer =
gst_buffer_new_allocate (priv->allocator, info->size, &priv->params);
if (*buffer == NULL)
goto no_memory;
if (!priv->multi_plane) {
*buffer =
gst_buffer_new_allocate (priv->allocator, info->size, &priv->params);
if (*buffer == NULL)
goto no_memory;
} else {
gint plane_num = GST_VIDEO_INFO_N_PLANES (info);
*buffer = gst_buffer_new ();
if (*buffer == NULL)
goto no_memory;
for (int plane = 0; plane < plane_num; plane++) {
GstMemory *mem = gst_allocator_alloc (priv->allocator,
video_buffer_pool_get_plane_size (info, plane), &priv->params);
if (mem == NULL) {
gst_buffer_unref (*buffer);
*buffer = NULL;
goto no_memory;
}
gst_buffer_append_memory (*buffer, mem);
}
}
if (priv->add_videometa) {
GST_DEBUG_OBJECT (pool, "adding GstVideoMeta");

8
subprojects/gst-plugins-base/gst-libs/gst/video/gstvideopool.h
View file

@ -45,6 +45,14 @@ G_BEGIN_DECLS
*/
#define GST_BUFFER_POOL_OPTION_VIDEO_ALIGNMENT "GstBufferPoolOptionVideoAlignment"
/**
* GST_BUFFER_POOL_OPTION_VIDEO_MULTI_PLANE:
*
* An option that can be activated on bufferpool to request
* multi gstmemory in a gstbuffer when possible
*/
#define GST_BUFFER_POOL_OPTION_VIDEO_MULTI_PLANE "GstBufferPoolOptionVideoMultiPlane"
/* setting a bufferpool config */
GST_VIDEO_API