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98249a57db
volatile is not sufficient to provide atomic guarantees and real atomics should be used instead. GCC 11 has started warning about using volatile with atomic operations. https://gitlab.gnome.org/GNOME/glib/-/merge_requests/1719 Discovered in https://gitlab.freedesktop.org/gstreamer/gst-plugins-good/-/issues/868 Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-base/-/merge_requests/1073>
472 lines
15 KiB
C
472 lines
15 KiB
C
/*
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* GStreamer
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* Copyright (C) 2018 Carlos Rafael Giani <dv@pseudoterminal.org>
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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 "gstgldisplay_gbm.h"
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#include "gstgl_gbm_utils.h"
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#include <unistd.h>
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#include <fcntl.h>
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#include <errno.h>
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GST_DEBUG_CATEGORY (gst_gl_gbm_debug);
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GST_DEBUG_CATEGORY_STATIC (gst_gl_display_debug);
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#define GST_CAT_DEFAULT gst_gl_display_debug
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#define INVALID_CRTC ((guint32)0)
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G_DEFINE_TYPE (GstGLDisplayGBM, gst_gl_display_gbm, GST_TYPE_GL_DISPLAY);
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static void gst_gl_display_gbm_finalize (GObject * object);
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static guintptr gst_gl_display_gbm_get_handle (GstGLDisplay * display);
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static guint32 gst_gl_gbm_find_crtc_id_for_encoder (GstGLDisplayGBM *
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display_gbm, drmModeEncoder const *encoder);
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static guint32 gst_gl_gbm_find_crtc_id_for_connector (GstGLDisplayGBM *
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display_gbm);
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static gboolean gst_gl_display_gbm_setup_drm (GstGLDisplayGBM * display_gbm,
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const gchar * drm_connector_name);
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static void gst_gl_display_gbm_shutdown_drm (GstGLDisplayGBM * display_gbm);
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static gboolean gst_gl_display_gbm_setup_gbm (GstGLDisplayGBM * display_gbm);
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static void gst_gl_display_gbm_shutdown_gbm (GstGLDisplayGBM * display_gbm);
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static void
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gst_gl_display_gbm_class_init (GstGLDisplayGBMClass * klass)
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{
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GST_GL_DISPLAY_CLASS (klass)->get_handle =
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GST_DEBUG_FUNCPTR (gst_gl_display_gbm_get_handle);
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G_OBJECT_CLASS (klass)->finalize = gst_gl_display_gbm_finalize;
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}
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static void
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gst_gl_display_gbm_init (GstGLDisplayGBM * display_gbm)
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{
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GstGLDisplay *display = (GstGLDisplay *) display_gbm;
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display->type = GST_GL_DISPLAY_TYPE_GBM;
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display_gbm->drm_fd = -1;
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}
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static void
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gst_gl_display_gbm_finalize (GObject * object)
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{
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GstGLDisplayGBM *display_gbm = GST_GL_DISPLAY_GBM (object);
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gst_gl_display_gbm_shutdown_gbm (display_gbm);
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gst_gl_display_gbm_shutdown_drm (display_gbm);
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if (display_gbm->drm_fd >= 0)
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close (display_gbm->drm_fd);
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G_OBJECT_CLASS (gst_gl_display_gbm_parent_class)->finalize (object);
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}
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static guintptr
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gst_gl_display_gbm_get_handle (GstGLDisplay * display)
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{
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return (guintptr) GST_GL_DISPLAY_GBM (display)->gbm_dev;
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}
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static guint32
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gst_gl_gbm_find_crtc_id_for_encoder (GstGLDisplayGBM * display_gbm,
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drmModeEncoder const *encoder)
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{
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int i;
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for (i = 0; i < display_gbm->drm_mode_resources->count_crtcs; ++i) {
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/* possible_crtcs is a bitmask as described here:
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* https://dvdhrm.wordpress.com/2012/09/13/linux-drm-mode-setting-api */
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guint32 const crtc_mask = 1 << i;
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guint32 const crtc_id = display_gbm->drm_mode_resources->crtcs[i];
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if (encoder->possible_crtcs & crtc_mask)
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return crtc_id;
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}
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/* No match found */
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return INVALID_CRTC;
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}
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static guint32
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gst_gl_gbm_find_crtc_id_for_connector (GstGLDisplayGBM * display_gbm)
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{
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int i;
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for (i = 0; i < display_gbm->drm_mode_connector->count_encoders; ++i) {
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guint32 encoder_id = display_gbm->drm_mode_connector->encoders[i];
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drmModeEncoder *encoder =
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drmModeGetEncoder (display_gbm->drm_fd, encoder_id);
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if (encoder != NULL) {
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guint32 crtc_id =
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gst_gl_gbm_find_crtc_id_for_encoder (display_gbm, encoder);
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drmModeFreeEncoder (encoder);
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if (crtc_id != INVALID_CRTC)
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return crtc_id;
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}
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}
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/* No match found */
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return INVALID_CRTC;
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}
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static gboolean
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gst_gl_display_gbm_setup_drm (GstGLDisplayGBM * display_gbm, const gchar *
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drm_connector_name)
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{
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int i;
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g_assert (display_gbm != NULL);
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g_assert (display_gbm->drm_fd >= 0);
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/* Get the DRM mode resources */
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display_gbm->drm_mode_resources = drmModeGetResources (display_gbm->drm_fd);
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if (display_gbm->drm_mode_resources == NULL) {
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GST_ERROR ("Could not get DRM resources: %s (%d)", g_strerror (errno),
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errno);
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goto cleanup;
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}
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GST_DEBUG ("Got DRM resources");
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/* Find a connected connector. The connector is where the pixel data is
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* finally sent to, and typically connects to some form of display, like an
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* HDMI TV, an LVDS panel etc. */
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{
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drmModeConnector *connected_connector = NULL;
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GST_DEBUG ("Checking %d DRM connector(s)",
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display_gbm->drm_mode_resources->count_connectors);
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for (i = 0; i < display_gbm->drm_mode_resources->count_connectors; ++i) {
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drmModeConnector *candidate_connector =
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drmModeGetConnector (display_gbm->drm_fd,
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display_gbm->drm_mode_resources->connectors[i]);
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gchar *candidate_name;
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candidate_name = g_strdup_printf ("%s-%i",
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gst_gl_gbm_get_name_for_drm_connector (candidate_connector),
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candidate_connector->connector_type_id);
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GST_DEBUG ("Found DRM connector #%d \"%s\" with ID %" G_GUINT32_FORMAT, i,
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candidate_name, candidate_connector->connector_id);
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/* If we already picked a connector, and connected_connector is therefore
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* non-NULL, then are just printing information about the other connectors
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* for logging purposes by now, so don't actually do anything with this
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* connector. Just loop instead. */
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if (connected_connector != NULL) {
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drmModeFreeConnector (candidate_connector);
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g_free (candidate_name);
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continue;
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}
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if (drm_connector_name != NULL) {
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if (g_ascii_strcasecmp (drm_connector_name, candidate_name) != 0) {
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drmModeFreeConnector (candidate_connector);
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g_free (candidate_name);
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continue;
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}
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}
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if (candidate_connector->connection == DRM_MODE_CONNECTED) {
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if (drm_connector_name != NULL)
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GST_DEBUG ("Picking DRM connector #%d because it is connected and "
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"has a matching name \"%s\"", i, candidate_name);
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else
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GST_DEBUG ("Picking DRM connector #%d because it is connected", i);
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connected_connector = candidate_connector;
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g_free (candidate_name);
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break;
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} else {
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if (drm_connector_name != NULL)
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GST_WARNING ("DRM connector #%d has a matching name \"%s\" but is "
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"not connected; not picking it", i, candidate_name);
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drmModeFreeConnector (candidate_connector);
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g_free (candidate_name);
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}
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}
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if (connected_connector == NULL) {
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GST_ERROR ("No connected DRM connector found");
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goto cleanup;
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}
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display_gbm->drm_mode_connector = connected_connector;
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}
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/* Check out what modes are supported by the chosen connector,
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* and pick either the "preferred" mode or the one with the largest
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* pixel area. */
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{
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int selected_mode_index = -1;
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int selected_mode_area = -1;
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gboolean preferred_mode_found = FALSE;
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GST_DEBUG ("Checking %d DRM mode(s) from selected connector",
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display_gbm->drm_mode_connector->count_modes);
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for (i = 0; i < display_gbm->drm_mode_connector->count_modes; ++i) {
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drmModeModeInfo *current_mode =
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&(display_gbm->drm_mode_connector->modes[i]);
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int current_mode_area = current_mode->hdisplay * current_mode->vdisplay;
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GST_DEBUG ("Found DRM mode #%d width/height %" G_GUINT16_FORMAT "/%"
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G_GUINT16_FORMAT " hsync/vsync start %" G_GUINT16_FORMAT "/%"
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G_GUINT16_FORMAT " hsync/vsync end %" G_GUINT16_FORMAT "/%"
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G_GUINT16_FORMAT " htotal/vtotal %" G_GUINT16_FORMAT "/%"
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G_GUINT16_FORMAT " hskew %" G_GUINT16_FORMAT " vscan %"
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G_GUINT16_FORMAT " vrefresh %" G_GUINT32_FORMAT " preferred %d", i,
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current_mode->hdisplay, current_mode->vdisplay,
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current_mode->hsync_start, current_mode->vsync_start,
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current_mode->hsync_end, current_mode->vsync_end,
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current_mode->htotal, current_mode->vtotal, current_mode->hskew,
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current_mode->vscan, current_mode->vrefresh,
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(current_mode->type & DRM_MODE_TYPE_PREFERRED) ? TRUE : FALSE);
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if (!preferred_mode_found
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&& ((current_mode->type & DRM_MODE_TYPE_PREFERRED)
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|| (current_mode_area > selected_mode_area))) {
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display_gbm->drm_mode_info = current_mode;
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selected_mode_area = current_mode_area;
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selected_mode_index = i;
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if (current_mode->type & DRM_MODE_TYPE_PREFERRED)
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preferred_mode_found = TRUE;
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}
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}
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if (display_gbm->drm_mode_info == NULL) {
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GST_ERROR ("No usable DRM mode found");
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goto cleanup;
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}
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GST_DEBUG ("Selected DRM mode #%d (is preferred: %d)", selected_mode_index,
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preferred_mode_found);
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}
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/* Find an encoder that is attached to the chosen connector. Also find the
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* index/id of the CRTC associated with this encoder. The encoder takes pixel
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* data from the CRTC and transmits it to the connector. The CRTC roughly
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* represents the scanout framebuffer.
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*
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* Ultimately, we only care about the CRTC index & ID, so the encoder
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* reference is discarded here once these are found. The CRTC index is the
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* index in the m_drm_mode_resources' CRTC array, while the ID is an identifier
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* used by the DRM to refer to the CRTC universally. (We need the CRTC
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* information for page flipping and DRM scanout framebuffer configuration.) */
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{
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drmModeEncoder *selected_encoder = NULL;
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GST_DEBUG ("Checking %d DRM encoder(s)",
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display_gbm->drm_mode_resources->count_encoders);
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for (i = 0; i < display_gbm->drm_mode_resources->count_encoders; ++i) {
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drmModeEncoder *candidate_encoder =
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drmModeGetEncoder (display_gbm->drm_fd,
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display_gbm->drm_mode_resources->encoders[i]);
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GST_DEBUG ("Found DRM encoder #%d \"%s\"", i,
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gst_gl_gbm_get_name_for_drm_encoder (candidate_encoder));
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if ((selected_encoder == NULL) &&
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(candidate_encoder->encoder_id ==
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display_gbm->drm_mode_connector->encoder_id)) {
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selected_encoder = candidate_encoder;
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GST_DEBUG ("DRM encoder #%d corresponds to selected DRM connector "
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"-> selected", i);
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} else
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drmModeFreeEncoder (candidate_encoder);
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}
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if (selected_encoder == NULL) {
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GST_DEBUG ("No encoder found; searching for CRTC ID in the connector");
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display_gbm->crtc_id =
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gst_gl_gbm_find_crtc_id_for_connector (display_gbm);
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} else {
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GST_DEBUG ("Using CRTC ID from selected encoder");
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display_gbm->crtc_id = selected_encoder->crtc_id;
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drmModeFreeEncoder (selected_encoder);
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}
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if (display_gbm->crtc_id == INVALID_CRTC) {
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GST_ERROR ("No CRTC found");
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goto cleanup;
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}
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GST_DEBUG ("CRTC with ID %" G_GUINT32_FORMAT " found; now locating it in "
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"the DRM mode resources CRTC array", display_gbm->crtc_id);
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for (i = 0; i < display_gbm->drm_mode_resources->count_crtcs; ++i) {
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if (display_gbm->drm_mode_resources->crtcs[i] == display_gbm->crtc_id) {
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display_gbm->crtc_index = i;
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break;
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}
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}
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if (display_gbm->crtc_index < 0) {
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GST_ERROR ("No matching CRTC entry in DRM resources found");
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goto cleanup;
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}
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GST_DEBUG ("CRTC with ID %" G_GUINT32_FORMAT " can be found at index #%d "
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"in the DRM mode resources CRTC array", display_gbm->crtc_id,
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display_gbm->crtc_index);
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}
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GST_DEBUG ("DRM structures initialized");
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return TRUE;
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cleanup:
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gst_gl_display_gbm_shutdown_drm (display_gbm);
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return FALSE;
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}
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static void
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gst_gl_display_gbm_shutdown_drm (GstGLDisplayGBM * display_gbm)
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{
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g_assert (display_gbm != NULL);
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display_gbm->drm_mode_info = NULL;
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display_gbm->crtc_index = -1;
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display_gbm->crtc_id = INVALID_CRTC;
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if (display_gbm->drm_mode_connector != NULL) {
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drmModeFreeConnector (display_gbm->drm_mode_connector);
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display_gbm->drm_mode_connector = NULL;
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}
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if (display_gbm->drm_mode_resources != NULL) {
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drmModeFreeResources (display_gbm->drm_mode_resources);
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display_gbm->drm_mode_resources = NULL;
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}
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}
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static gboolean
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gst_gl_display_gbm_setup_gbm (GstGLDisplayGBM * display_gbm)
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{
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display_gbm->gbm_dev = gbm_create_device (display_gbm->drm_fd);
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if (display_gbm->gbm_dev == NULL) {
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GST_ERROR ("Creating GBM device failed");
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return FALSE;
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}
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GST_DEBUG ("GBM structures initialized");
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return TRUE;
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}
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static void
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gst_gl_display_gbm_shutdown_gbm (GstGLDisplayGBM * display_gbm)
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{
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if (display_gbm->gbm_dev != NULL) {
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gbm_device_destroy (display_gbm->gbm_dev);
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display_gbm->gbm_dev = NULL;
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}
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}
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static void
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_init_debug (void)
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{
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static gsize _init = 0;
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if (g_once_init_enter (&_init)) {
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GST_DEBUG_CATEGORY_GET (gst_gl_display_debug, "gldisplay");
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GST_DEBUG_CATEGORY_INIT (gst_gl_gbm_debug, "gleglgbm", 0,
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"Mesa3D EGL GBM debugging");
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g_once_init_leave (&_init, 1);
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}
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}
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GstGLDisplayGBM *
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gst_gl_display_gbm_new (void)
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{
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int drm_fd = -1;
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GstGLDisplayGBM *display;
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const gchar *drm_node_name;
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const gchar *drm_connector_name;
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_init_debug ();
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drm_node_name = g_getenv ("GST_GL_GBM_DRM_DEVICE");
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drm_connector_name = g_getenv ("GST_GL_GBM_DRM_CONNECTOR");
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if (drm_node_name != NULL) {
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GST_DEBUG ("attempting to open device %s (specified by the "
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"GST_GL_GBM_DRM_DEVICE environment variable)", drm_node_name);
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drm_fd = open (drm_node_name, O_RDWR | O_CLOEXEC);
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if (drm_fd < 0) {
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GST_ERROR ("could not open DRM device %s: %s (%d)", drm_node_name,
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g_strerror (errno), errno);
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return NULL;
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}
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} else {
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GST_DEBUG ("GST_GL_GBM_DRM_DEVICE environment variable is not "
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"set - trying to autodetect device");
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drm_fd = gst_gl_gbm_find_and_open_drm_node ();
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if (drm_fd < 0) {
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GST_ERROR ("could not find or open DRM device");
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return NULL;
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}
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}
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display = g_object_new (GST_TYPE_GL_DISPLAY_GBM, NULL);
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display->drm_fd = drm_fd;
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if (drm_connector_name != NULL) {
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GST_DEBUG ("GST_GL_GBM_DRM_CONNECTOR variable set to value \"%s\"; "
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"will use this name to match connector(s) against", drm_connector_name);
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}
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if (!gst_gl_display_gbm_setup_drm (display, drm_connector_name)) {
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GST_WARNING ("Failed to initialize DRM");
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}
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if (!gst_gl_display_gbm_setup_gbm (display)) {
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GST_ERROR ("Failed to initialize GBM");
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goto cleanup;
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}
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GST_DEBUG ("Created GBM EGL display %p", (gpointer) display);
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return display;
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cleanup:
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gst_gl_display_gbm_shutdown_gbm (display);
|
|
gst_gl_display_gbm_shutdown_drm (display);
|
|
gst_object_unref (G_OBJECT (display));
|
|
if (drm_fd >= 0)
|
|
close (drm_fd);
|
|
return NULL;
|
|
}
|