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7df22b338b
This makes Wayland's allocator public. It is generally useful to have a shared memory allocator that can create memfd on Linux. Sponsored-by: Netflix Inc. Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/5328>
105 lines
3.4 KiB
C
105 lines
3.4 KiB
C
/* GStreamer Wayland Library
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*
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* Copyright (C) 2012 Intel Corporation
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* Copyright (C) 2012 Sreerenj Balachandran <sreerenj.balachandran@intel.com>
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* Copyright (C) 2014 Collabora Ltd.
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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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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif
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#include "gstwlshmallocator.h"
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static gboolean
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gst_wl_shm_validate_video_info (const GstVideoInfo * vinfo)
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{
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gint height = GST_VIDEO_INFO_HEIGHT (vinfo);
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gint base_stride = GST_VIDEO_INFO_PLANE_STRIDE (vinfo, 0);
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gsize base_offs = GST_VIDEO_INFO_PLANE_OFFSET (vinfo, 0);
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gint i;
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gsize offs = 0;
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for (i = 0; i < GST_VIDEO_INFO_N_PLANES (vinfo); i++) {
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guint32 estride;
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/* Overwrite the video info's stride and offset using the pitch calculcated
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* by the kms driver. */
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estride = gst_video_format_info_extrapolate_stride (vinfo->finfo, i,
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base_stride);
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if (estride != GST_VIDEO_INFO_PLANE_STRIDE (vinfo, i))
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return FALSE;
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if (GST_VIDEO_INFO_PLANE_OFFSET (vinfo, i) - base_offs != offs)
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return FALSE;
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/* Note that we cannot negotiate special padding betweem each planes,
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* hence using the display height here. */
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offs +=
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estride * GST_VIDEO_FORMAT_INFO_SCALE_HEIGHT (vinfo->finfo, i, height);
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}
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if (vinfo->size < offs)
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return FALSE;
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return TRUE;
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}
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struct wl_buffer *
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gst_wl_shm_memory_construct_wl_buffer (GstMemory * mem, GstWlDisplay * display,
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const GstVideoInfo * info)
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{
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gint width, height, stride;
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gsize offset, size, memsize, maxsize;
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enum wl_shm_format format;
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struct wl_shm_pool *wl_pool;
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struct wl_buffer *wbuffer;
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if (!gst_wl_shm_validate_video_info (info)) {
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GST_DEBUG_OBJECT (display, "Unsupported strides and offsets.");
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return NULL;
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}
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width = GST_VIDEO_INFO_WIDTH (info);
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height = GST_VIDEO_INFO_HEIGHT (info);
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stride = GST_VIDEO_INFO_PLANE_STRIDE (info, 0);
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size = GST_VIDEO_INFO_SIZE (info);
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format = gst_video_format_to_wl_shm_format (GST_VIDEO_INFO_FORMAT (info));
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memsize = gst_memory_get_sizes (mem, &offset, &maxsize);
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offset += GST_VIDEO_INFO_PLANE_OFFSET (info, 0);
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g_return_val_if_fail (gst_is_fd_memory (mem), NULL);
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g_return_val_if_fail (size <= memsize, NULL);
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g_return_val_if_fail (gst_wl_display_check_format_for_shm (display, info),
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NULL);
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GST_DEBUG_OBJECT (display, "Creating wl_buffer from SHM of size %"
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G_GSSIZE_FORMAT " (%d x %d, stride %d), format %s", size, width, height,
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stride, gst_wl_shm_format_to_string (format));
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wl_pool = wl_shm_create_pool (gst_wl_display_get_shm (display),
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gst_fd_memory_get_fd (mem), memsize);
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wbuffer = wl_shm_pool_create_buffer (wl_pool, offset, width, height, stride,
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format);
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wl_shm_pool_destroy (wl_pool);
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return wbuffer;
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}
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