gstreamer/subprojects/gst-plugins-bad/gst-libs/gst/wayland/gstwlvideobufferpool.c

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/* GStreamer Wayland Library
*
* Copyright (C) 2017 Collabora Ltd.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include "gstwlvideobufferpool.h"
#include <gst/allocators/allocators.h>
#include <drm_fourcc.h>
GST_DEBUG_CATEGORY (gst_wl_videobufferpool_debug);
#define GST_CAT_DEFAULT gst_wl_videobufferpool_debug
struct _GstWlVideoBufferPool
{
GstVideoBufferPool parent;
GstAllocator *allocator;
GstVideoInfo vinfo;
};
#define gst_wl_video_buffer_pool_parent_class parent_class
G_DEFINE_TYPE_WITH_CODE (GstWlVideoBufferPool, gst_wl_video_buffer_pool,
GST_TYPE_VIDEO_BUFFER_POOL,
GST_DEBUG_CATEGORY_INIT (gst_wl_videobufferpool_debug,
"wl_videobufferpool", 0, "wl_dmabuf library"));
static void
gst_wl_update_video_info_from_pitch (GstVideoInfo * vinfo, gint n_planes,
guint32 pitch)
{
gint i;
gsize offs = 0;
guint32 height = GST_VIDEO_INFO_HEIGHT (vinfo);
if (!pitch)
return;
for (i = 0; i < n_planes; i++) {
guint32 plane_pitch;
/* Overwrite the video info's stride and offset using the pitch calculcated
* by the kms driver. */
plane_pitch = gst_video_format_info_extrapolate_stride (vinfo->finfo, i,
pitch);
GST_VIDEO_INFO_PLANE_STRIDE (vinfo, i) = plane_pitch;
GST_VIDEO_INFO_PLANE_OFFSET (vinfo, i) = offs;
/* Note that we cannot negotiate special padding betweem each planes,
* hence using the display height here. */
offs += plane_pitch
* GST_VIDEO_FORMAT_INFO_SCALE_HEIGHT (vinfo->finfo, i, height);
GST_DEBUG ("Updated plane %i with stride %i and "
"offset %" G_GSIZE_FORMAT "(from pitch %u)", i,
GST_VIDEO_INFO_PLANE_STRIDE (vinfo, i),
GST_VIDEO_INFO_PLANE_OFFSET (vinfo, i), pitch);
}
/* Update with the size use for display, excluding any padding at the end */
GST_VIDEO_INFO_SIZE (vinfo) = offs;
}
static gboolean
gst_wl_video_buffer_pool_start (GstBufferPool * pool)
{
GstWlVideoBufferPool *self = GST_WL_VIDEO_BUFFER_POOL (pool);
GstStructure *config = gst_buffer_pool_get_config (pool);
GstCaps *caps;
GstAllocator *allocator;
gboolean ret = FALSE;
GstVideoFormat format;
if (!gst_buffer_pool_config_get_params (config, &caps, NULL, NULL, NULL))
goto wrong_config;
if (!gst_buffer_pool_config_get_allocator (config, &allocator, NULL))
goto wrong_config;
/* now parse the caps from the config */
if (!gst_video_info_from_caps (&self->vinfo, caps))
goto wrong_caps;
format = GST_VIDEO_INFO_FORMAT (&self->vinfo);
if (!gst_video_format_to_wl_dmabuf_format (format))
goto unsupported_pixel_format;
if (GST_IS_DRM_DUMB_ALLOCATOR (allocator)) {
if (!gst_drm_dumb_allocator_has_prime_export (allocator))
goto no_prime_export;
self->allocator = gst_object_ref (allocator);
}
/* all good */
ret = GST_BUFFER_POOL_CLASS (parent_class)->start (pool);
done:
gst_structure_free (config);
return ret;
wrong_config:
{
GST_WARNING_OBJECT (pool, "invalid config");
goto done;
}
wrong_caps:
{
GST_WARNING_OBJECT (pool,
"failed getting geometry from caps %" GST_PTR_FORMAT, caps);
goto done;
}
unsupported_pixel_format:
{
GST_WARNING_OBJECT (pool, "no support for %s pixel format",
gst_video_format_to_string (format));
goto done;
}
no_prime_export:
{
GST_WARNING_OBJECT (self,
"not using DRM Dumb allocator as it can't export DMABuf.");
goto done;
}
}
static gboolean
gst_wl_video_buffer_pool_stop (GstBufferPool * pool)
{
GstWlVideoBufferPool *self = GST_WL_VIDEO_BUFFER_POOL (pool);
gst_clear_object (&self->allocator);
gst_video_info_init (&self->vinfo);
return GST_BUFFER_POOL_CLASS (parent_class)->stop (pool);
}
static GstFlowReturn
gst_wl_video_buffer_pool_alloc_buffer (GstBufferPool * pool,
GstBuffer ** buffer, GstBufferPoolAcquireParams * params)
{
GstWlVideoBufferPool *self = GST_WL_VIDEO_BUFFER_POOL (pool);
guint32 pitch;
GstBuffer *buf;
GstMemory *drm_mem, *dma_mem;
gsize dumbbuf_size;
GstVideoFormat format = GST_VIDEO_INFO_FORMAT (&self->vinfo);
guint32 drm_fourcc = gst_video_format_to_wl_dmabuf_format (format);
if (!self->allocator)
return GST_BUFFER_POOL_CLASS (parent_class)->alloc_buffer (pool, buffer,
params);
drm_mem = gst_drm_dumb_allocator_alloc (self->allocator,
drm_fourcc, GST_VIDEO_INFO_WIDTH (&self->vinfo),
GST_VIDEO_INFO_HEIGHT (&self->vinfo), &pitch);
if (!drm_mem)
goto alloc_failed;
dma_mem = gst_drm_dumb_memory_export_dmabuf (drm_mem);
gst_memory_unref (drm_mem);
drm_mem = NULL;
gst_wl_update_video_info_from_pitch (&self->vinfo,
GST_VIDEO_INFO_N_PLANES (&self->vinfo), pitch);
gst_memory_get_sizes (dma_mem, NULL, &dumbbuf_size);
if (dumbbuf_size < GST_VIDEO_INFO_SIZE (&self->vinfo)) {
GST_ERROR_OBJECT (self,
"DUMB buffer has a size of %" G_GSIZE_FORMAT
" but we require at least %" G_GSIZE_FORMAT " to hold a frame",
dumbbuf_size, GST_VIDEO_INFO_SIZE (&self->vinfo));
goto buffer_too_small;
}
gst_memory_resize (dma_mem, 0, GST_VIDEO_INFO_SIZE (&self->vinfo));
buf = gst_buffer_new ();
gst_buffer_append_memory (buf, dma_mem);
gst_buffer_add_video_meta_full (buf, GST_VIDEO_FRAME_FLAG_NONE,
GST_VIDEO_INFO_FORMAT (&self->vinfo), GST_VIDEO_INFO_WIDTH (&self->vinfo),
GST_VIDEO_INFO_HEIGHT (&self->vinfo),
GST_VIDEO_INFO_N_PLANES (&self->vinfo),
self->vinfo.offset, self->vinfo.stride);
*buffer = buf;
return GST_FLOW_OK;
/* ERRORS */
alloc_failed:
{
GST_ERROR_OBJECT (self, "failed to allocate DRM Dumb buffer.");
return GST_FLOW_ERROR;
}
buffer_too_small:
{
GST_ERROR_OBJECT (self, "dumb buffer too small to store an image.");
return GST_FLOW_ERROR;
}
}
static const gchar **
gst_wl_video_buffer_pool_get_options (GstBufferPool * pool)
{
static const gchar *options[] = { GST_BUFFER_POOL_OPTION_VIDEO_META, NULL };
return options;
}
static void
gst_wl_video_buffer_pool_class_init (GstWlVideoBufferPoolClass * klass)
{
GstBufferPoolClass *pool_class = GST_BUFFER_POOL_CLASS (klass);
pool_class->get_options = gst_wl_video_buffer_pool_get_options;
pool_class->start = gst_wl_video_buffer_pool_start;
pool_class->stop = gst_wl_video_buffer_pool_stop;
pool_class->alloc_buffer = gst_wl_video_buffer_pool_alloc_buffer;
}
static void
gst_wl_video_buffer_pool_init (GstWlVideoBufferPool * self)
{
gst_video_info_init (&self->vinfo);
}
GstBufferPool *
gst_wl_video_buffer_pool_new (void)
{
return (GstBufferPool *) g_object_new (GST_TYPE_WL_VIDEO_BUFFER_POOL, NULL);
}