gstreamer/subprojects/gst-plugins-base/gst-libs/gst/allocators/gstdrmdumb.c

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/* GStreamer
*
* Copyright (C) 2023 Collabora
* Copyright (C) 2016 Igalia
*
* Authors:
* Víctor Manuel Jáquez Leal <vjaquez@igalia.com>
* Javier Martin <javiermartin@by.com.es>
* Colin Kinloch <colin.kinloch@collabora.com>
*
* 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 "gstdrmdumb.h"
#include "gstdmabuf.h"
/**
* SECTION:gstdrmdumb
* @title: GstDRMDumbAllocator
* @short_description: Memory wrapper for Linux DRM Dumb memory
* @see_also: #GstMemory
*
* Since: 1.24
*/
#ifdef HAVE_LIBDRM
#include <fcntl.h>
#include <sys/ioctl.h>
#include <sys/mman.h>
#include <unistd.h>
#include <drm.h>
#include <drm_fourcc.h>
#include <xf86drm.h>
#endif
#define GST_CAT_DEFAULT drmdumballocator_debug
GST_DEBUG_CATEGORY_STATIC (GST_CAT_DEFAULT);
#define GST_DRM_DUMB_MEMORY_TYPE "DRMDumbMemory"
typedef struct _GstDRMDumbMemory GstDRMDumbMemory;
struct _GstDRMDumbMemory
{
GstMemory parent;
gpointer ptr;
gsize size;
guint32 handle;
guint refs;
};
struct _GstDRMDumbAllocator
{
GstAllocator parent;
gint drm_fd;
gchar *drm_device_path;
/* protected by GstDRMDumbAllocator object lock */
GstAllocator *dmabuf_alloc;
};
#define parent_class gst_drm_dumb_allocator_parent_class
G_DEFINE_TYPE_WITH_CODE (GstDRMDumbAllocator, gst_drm_dumb_allocator,
GST_TYPE_ALLOCATOR,
GST_DEBUG_CATEGORY_INIT (GST_CAT_DEFAULT, "drmdumballocator", 0,
"DRM dumb buffer allocator"));
enum
{
PROP_DRM_FD = 1,
PROP_DRM_DEVICE_PATH,
PROP_N,
};
static GParamSpec *g_props[PROP_N] = { NULL, };
/**
* gst_is_drm_dumb_memory:
* @mem: the memory to be checked
*
* Returns: %TRUE if @mem is DRM Dumb memory, otherwise %FALSE
*
* Since: 1.24
*/
gboolean
gst_is_drm_dumb_memory (GstMemory * mem)
{
return gst_memory_is_type (mem, GST_DRM_DUMB_MEMORY_TYPE);
}
/**
* gst_drm_dumb_memory_get_handle:
* @mem: the memory to get the handle from
*
* Return the DRM buffer object handle associated with @mem.
*
* Returns: the DRM buffer object handle associated with the memory, or 0.
* The handle is still owned by the GstMemory and cannot be used
* beyond the lifetime of this GstMemory unless it is being passed
* to DRM driver, which does handle a refcount internally.
*
* Since: 1.24
*/
guint32
gst_drm_dumb_memory_get_handle (GstMemory * mem)
{
if (!gst_is_drm_dumb_memory (mem))
return 0;
return ((GstDRMDumbMemory *) mem)->handle;
}
/**
* gst_drm_dumb_memory_export_dmabuf:
* @mem: the memory to export from
*
* Exports a DMABuf from the DRM Bumb buffer object. One can check if this
* feature is supported using gst_drm_dumb_allocator_has_prime_export();
*
* Returns: a #GstMemory from #GstDmaBufAllocator wrapping the exported dma-buf
* file descriptor.
*
* Since: 1.24
*/
GstMemory *
gst_drm_dumb_memory_export_dmabuf (GstMemory * mem)
{
#ifdef HAVE_LIBDRM
GstDRMDumbMemory *drmmem = (GstDRMDumbMemory *) mem;
GstDRMDumbAllocator *alloc = GST_DRM_DUMB_ALLOCATOR (mem->allocator);
GstMemory *dmamem;
gint ret;
gint prime_fd;
ret = drmPrimeHandleToFD (alloc->drm_fd, drmmem->handle,
DRM_CLOEXEC | DRM_RDWR, &prime_fd);
if (ret)
goto export_fd_failed;
if (G_UNLIKELY (alloc->dmabuf_alloc == NULL))
alloc->dmabuf_alloc = gst_dmabuf_allocator_new ();
dmamem = gst_dmabuf_allocator_alloc (alloc->dmabuf_alloc, prime_fd,
gst_memory_get_sizes (mem, NULL, NULL));
GST_DEBUG_OBJECT (alloc, "Exported bo handle %d as %d", drmmem->handle,
prime_fd);
return dmamem;
/* ERRORS */
export_fd_failed:
{
GST_ERROR_OBJECT (alloc, "Failed to export bo handle %d: %s (%d)",
drmmem->handle, g_strerror (errno), ret);
return NULL;
}
#else
return NULL;
#endif
}
#ifdef HAVE_LIBDRM
static guint32
gst_drm_height_from_drm (guint32 drmfmt, guint32 height)
{
guint32 ret;
switch (drmfmt) {
case DRM_FORMAT_YUV420:
case DRM_FORMAT_YVU420:
case DRM_FORMAT_YUV422:
case DRM_FORMAT_NV12:
case DRM_FORMAT_NV21:
case DRM_FORMAT_P010:
case DRM_FORMAT_P016:
ret = height * 3 / 2;
break;
case DRM_FORMAT_NV16:
case DRM_FORMAT_NV61:
ret = height * 2;
break;
case DRM_FORMAT_NV24:
ret = height * 3;
break;
default:
ret = height;
break;
}
return ret;
}
static guint32
gst_drm_bpp_from_drm (guint32 drm_fourcc)
{
guint32 bpp;
switch (drm_fourcc) {
case DRM_FORMAT_YUV420:
case DRM_FORMAT_YVU420:
case DRM_FORMAT_YUV422:
case DRM_FORMAT_NV12:
case DRM_FORMAT_NV21:
case DRM_FORMAT_NV16:
case DRM_FORMAT_NV61:
case DRM_FORMAT_NV24:
bpp = 8;
break;
case DRM_FORMAT_P010:
bpp = 10;
break;
case DRM_FORMAT_UYVY:
case DRM_FORMAT_YUYV:
case DRM_FORMAT_YVYU:
case DRM_FORMAT_P016:
case DRM_FORMAT_RGB565:
case DRM_FORMAT_BGR565:
bpp = 16;
break;
case DRM_FORMAT_BGR888:
case DRM_FORMAT_RGB888:
bpp = 24;
break;
default:
bpp = 32;
break;
}
return bpp;
}
static gboolean
check_drm_fd (GstDRMDumbAllocator * alloc)
{
return alloc->drm_fd > -1;
}
#endif
static void
gst_drm_dumb_allocator_open_device (GstDRMDumbAllocator * alloc,
const gchar * path)
{
#ifdef HAVE_LIBDRM
gint fd = -1;
/* Ignore default constructor call */
if (path == NULL)
return;
/* construct only */
g_assert (alloc->drm_fd == -1);
g_assert (alloc->drm_device_path == NULL);
fd = open (path, O_RDWR | O_CLOEXEC);
if (fd < 0) {
GST_WARNING_OBJECT (alloc, "Failed to open DRM device at %s", path);
return;
}
alloc->drm_device_path = g_strdup (path);
alloc->drm_fd = fd;
#endif
}
static void
gst_drm_dumb_allocator_set_fd (GstDRMDumbAllocator * alloc, gint fd)
{
#ifdef HAVE_LIBDRM
/* Ignore default constructor call */
if (fd == -1)
return;
/* construct only */
g_assert (alloc->drm_fd == -1);
g_assert (alloc->drm_device_path == NULL);
if (fd >= 0) {
alloc->drm_device_path = drmGetDeviceNameFromFd2 (fd);
if (!alloc->drm_device_path) {
GST_WARNING_OBJECT (alloc, "Failed to verify DRM fd.");
return;
}
GST_DEBUG_OBJECT (alloc, "Using external FD for %s",
alloc->drm_device_path);
alloc->drm_fd = dup (fd);
}
#endif
}
static void
gst_drm_dumb_allocator_memory_reset (GstDRMDumbAllocator * alloc,
GstDRMDumbMemory * mem)
{
#ifdef HAVE_LIBDRM
gint err;
struct drm_mode_destroy_dumb arg = { 0, };
if (!mem->size)
return;
if (!check_drm_fd (alloc))
return;
if (mem->ptr != NULL) {
GST_WARNING_OBJECT (alloc, "destroying mapped bo (refcount=%d)", mem->refs);
munmap (mem->ptr, mem->size);
mem->ptr = NULL;
}
arg.handle = mem->handle;
err = drmIoctl (alloc->drm_fd, DRM_IOCTL_MODE_DESTROY_DUMB, &arg);
if (err)
GST_WARNING_OBJECT (alloc,
"Failed to destroy dumb buffer object: %s %d",
g_strerror (errno), errno);
mem->handle = -1;
mem->size = 0;
#endif
}
static gboolean
gst_drm_dumb_allocator_memory_create (GstDRMDumbAllocator * alloc,
GstDRMDumbMemory * drmmem,
guint32 drm_fourcc, guint32 width, guint32 height, guint32 * out_pitch)
{
#ifdef HAVE_LIBDRM
gint ret;
struct drm_mode_create_dumb arg = { 0, };
if (drmmem->size)
return TRUE;
if (!check_drm_fd (alloc))
return FALSE;
arg.bpp = gst_drm_bpp_from_drm (drm_fourcc);
arg.width = width;
arg.height = gst_drm_height_from_drm (drm_fourcc, height);
ret = drmIoctl (alloc->drm_fd, DRM_IOCTL_MODE_CREATE_DUMB, &arg);
if (ret)
goto create_failed;
if (!arg.pitch) {
GST_DEBUG_OBJECT (alloc,
"DRM dumb buffer pitch not set, no need to modify vinfo");
goto done;
}
GST_DEBUG_OBJECT (alloc,
"DRM dumb buffer pitch is set, vinfo modification required");
*out_pitch = arg.pitch;
done:
drmmem->handle = arg.handle;
/* will be used used as maxsize of GstMemory */
drmmem->size = arg.size;
return TRUE;
/* ERRORS */
create_failed:
{
GST_ERROR_OBJECT (alloc, "Failed to create buffer object: %s (%d)",
g_strerror (errno), errno);
return FALSE;
}
#else
return FALSE;
#endif
}
static void
gst_drm_dumb_allocator_free (GstAllocator * base_alloc, GstMemory * mem)
{
GstDRMDumbAllocator *alloc = GST_DRM_DUMB_ALLOCATOR (base_alloc);
GstDRMDumbMemory *drmmem;
drmmem = (GstDRMDumbMemory *) mem;
gst_drm_dumb_allocator_memory_reset (alloc, drmmem);
g_free (drmmem);
}
static void
gst_drm_dumb_allocator_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
GstDRMDumbAllocator *alloc = GST_DRM_DUMB_ALLOCATOR (object);
switch (prop_id) {
case PROP_DRM_FD:
gst_drm_dumb_allocator_set_fd (alloc, g_value_get_int (value));
break;
case PROP_DRM_DEVICE_PATH:
gst_drm_dumb_allocator_open_device (alloc, g_value_get_string (value));
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_drm_dumb_allocator_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec)
{
GstDRMDumbAllocator *alloc = GST_DRM_DUMB_ALLOCATOR (object);
switch (prop_id) {
case PROP_DRM_FD:
g_value_set_int (value, alloc->drm_fd);
break;
case PROP_DRM_DEVICE_PATH:
g_value_set_string (value, alloc->drm_device_path);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_drm_dumb_allocator_finalize (GObject * obj)
{
GstDRMDumbAllocator *alloc = GST_DRM_DUMB_ALLOCATOR (obj);
if (alloc->dmabuf_alloc)
gst_object_unref (alloc->dmabuf_alloc);
g_free (alloc->drm_device_path);
alloc->drm_device_path = NULL;
#ifdef HAVE_LIBDRM
if (alloc->drm_fd >= 0) {
close (alloc->drm_fd);
alloc->drm_fd = -1;
}
#endif
G_OBJECT_CLASS (parent_class)->finalize (obj);
}
static void
gst_drm_dumb_allocator_class_init (GstDRMDumbAllocatorClass * klass)
{
GObjectClass *gobject_class;
GstAllocatorClass *allocator_class;
allocator_class = GST_ALLOCATOR_CLASS (klass);
gobject_class = G_OBJECT_CLASS (klass);
allocator_class->free = gst_drm_dumb_allocator_free;
gobject_class->set_property = gst_drm_dumb_allocator_set_property;
gobject_class->get_property = gst_drm_dumb_allocator_get_property;
gobject_class->finalize = gst_drm_dumb_allocator_finalize;
/**
* GstDRMDumbAllocator:drm-fd:
*
* Since: 1.24
*/
g_props[PROP_DRM_FD] = g_param_spec_int ("drm-fd", "DRM fd",
"DRM file descriptor", -1, G_MAXINT, -1,
G_PARAM_READWRITE | G_PARAM_CONSTRUCT_ONLY);
/**
* GstDRMDumbAllocator:drm-device-path: (type filename):
*
* Since: 1.24
*/
g_props[PROP_DRM_DEVICE_PATH] = g_param_spec_string ("drm-device-path",
"DRM device path", "DRM device path", NULL,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS | G_PARAM_CONSTRUCT_ONLY);
g_object_class_install_properties (gobject_class, PROP_N, g_props);
}
static gpointer
gst_drm_dumb_memory_map (GstMemory * mem, gsize maxsize, GstMapFlags flags)
{
#ifdef HAVE_LIBDRM
GstDRMDumbAllocator *alloc = GST_DRM_DUMB_ALLOCATOR (mem->allocator);
GstDRMDumbMemory *drmmem;
gint err;
gpointer out;
struct drm_mode_map_dumb arg = { 0, };
if (!check_drm_fd (alloc))
return NULL;
drmmem = (GstDRMDumbMemory *) mem;
if (!drmmem->size)
return NULL;
/* Reuse existing buffer object mapping if possible */
if (drmmem->ptr != NULL) {
goto out;
}
arg.handle = drmmem->handle;
err = drmIoctl (alloc->drm_fd, DRM_IOCTL_MODE_MAP_DUMB, &arg);
if (err) {
GST_ERROR_OBJECT (alloc, "Failed to get offset of buffer object: %s %d",
g_strerror (errno), errno);
return NULL;
}
out = mmap (0, drmmem->size,
PROT_READ | PROT_WRITE, MAP_SHARED, alloc->drm_fd, arg.offset);
if (out == MAP_FAILED) {
GST_ERROR_OBJECT (alloc, "Failed to map dumb buffer object: %s %d",
g_strerror (errno), errno);
return NULL;
}
drmmem->ptr = out;
out:
g_atomic_int_inc (&drmmem->refs);
return drmmem->ptr;
#else
return NULL;
#endif
}
static void
gst_drm_dumb_memory_unmap (GstMemory * mem)
{
#ifdef HAVE_LIBDRM
GstDRMDumbMemory *drmmem;
if (!check_drm_fd ((GstDRMDumbAllocator *) mem->allocator))
return;
drmmem = (GstDRMDumbMemory *) mem;
if (!drmmem->size)
return;
if (g_atomic_int_dec_and_test (&drmmem->refs)) {
munmap (drmmem->ptr, drmmem->size);
drmmem->ptr = NULL;
}
#endif
}
static void
gst_drm_dumb_allocator_init (GstDRMDumbAllocator * alloc)
{
GstAllocator *base_alloc = GST_ALLOCATOR_CAST (alloc);
alloc->drm_fd = -1;
alloc->drm_device_path = NULL;
base_alloc->mem_type = GST_DRM_DUMB_MEMORY_TYPE;
base_alloc->mem_map = gst_drm_dumb_memory_map;
base_alloc->mem_unmap = gst_drm_dumb_memory_unmap;
/* Use the default, fallback copy function */
GST_OBJECT_FLAG_SET (alloc, GST_ALLOCATOR_FLAG_CUSTOM_ALLOC);
}
#ifdef HAVE_LIBDRM
static gboolean
check_cap (GstDRMDumbAllocator * alloc)
{
gint ret;
guint64 has_dumb = 0;
if (!alloc)
return FALSE;
if (!check_drm_fd (alloc))
return FALSE;
ret = drmGetCap (alloc->drm_fd, DRM_CAP_DUMB_BUFFER, &has_dumb);
if (ret)
GST_WARNING_OBJECT (alloc, "could not get dumb buffer capability");
return !!(has_dumb);
}
#endif
/**
* gst_drm_dumb_allocator_new_with_fd:
* @drm_fd: file descriptor of the DRM device
*
* Creates a new #GstDRMDumbAllocator for the specific file desciptor. This
* function can fail if the file descriptor is not a DRM device or if
* the DRM device does not support DUMB allocation.
*
* Returns: (transfer full) (nullable): a new DRM Dumb allocator. Use gst_object_unref()
* to release the allocator after usage.
*
* Since: 1.24
*/
GstAllocator *
gst_drm_dumb_allocator_new_with_fd (gint drm_fd)
{
#ifdef HAVE_LIBDRM
GstDRMDumbAllocator *alloc;
alloc = g_object_new (GST_TYPE_DRM_DUMB_ALLOCATOR, "drm-fd", drm_fd, NULL);
gst_object_ref_sink (alloc);
if (!check_drm_fd (alloc))
g_clear_object (&alloc);
if (!check_cap (alloc))
g_clear_object (&alloc);
return alloc ? GST_ALLOCATOR (alloc) : NULL;
#else
return NULL;
#endif
}
/**
* gst_drm_dumb_allocator_new_with_device_path:
* @drm_device_path: (type filename): path to the DRM device to open
*
* Creates a new #GstDRMDumbAllocator for the specific device path. This
* function can fail if the path does not exist, is not a DRM device or if
* the DRM device doesnot support DUMB allocation.
*
* Returns: (transfer full) (nullable): a new DRM Dumb allocator. Use gst_object_unref()
* to release the allocator after usage.
*
* Since: 1.24
*/
GstAllocator *
gst_drm_dumb_allocator_new_with_device_path (const gchar * drm_device_path)
{
#ifdef HAVE_LIBDRM
GstDRMDumbAllocator *alloc;
alloc = g_object_new (GST_TYPE_DRM_DUMB_ALLOCATOR,
"drm-device-path", drm_device_path, NULL);
gst_object_ref_sink (alloc);
if (!check_drm_fd (alloc))
g_clear_object (&alloc);
if (!check_cap (alloc))
g_clear_object (&alloc);
return alloc ? GST_ALLOCATOR (alloc) : NULL;
#else
return NULL;
#endif
}
/**
* gst_drm_dumb_allocator_alloc:
* @allocator: (type GstAllocators.DRMDumbAllocator): the allocator instance
* @drm_fourcc: the DRM format to allocate for
* @width: padded width for this allocation
* @height: padded height for this allocation
* @out_pitch: (out): the pitch as returned by the driver
*
* Allocated a DRM buffer object for the specific @drm_fourcc, @width and
* @height. Note that the DRM Dumb allocation interface is agnostic to the
* pixel format. This @drm_fourcc is converted into a bpp (bit-per-pixel)
* number and the height is scaled according to the sub-sampling.
*
* Returns: (transfer full): a new DRM Dumb #GstMemory. Use gst_memory_unref()
* to release the memory after usage.
*
* Since: 1.24
*/
GstMemory *
gst_drm_dumb_allocator_alloc (GstAllocator * base_alloc,
guint32 drm_fourcc, guint32 width, guint32 height, guint32 * out_pitch)
{
GstDRMDumbAllocator *alloc = GST_DRM_DUMB_ALLOCATOR (base_alloc);
GstDRMDumbMemory *drmmem;
GstMemory *mem;
drmmem = g_new0 (GstDRMDumbMemory, 1);
mem = GST_MEMORY_CAST (drmmem);
if (!gst_drm_dumb_allocator_memory_create (alloc, drmmem,
drm_fourcc, width, height, out_pitch)) {
g_free (drmmem);
return NULL;
}
gst_memory_init (mem, 0, base_alloc, NULL, drmmem->size, 0, 0, drmmem->size);
return mem;
}
/**
* gst_drm_dumb_allocator_has_prime_export:
* @allocator: (type GstAllocators.DRMDumbAllocator): the #GstAllocator
*
* This function allow verifying if the driver support dma-buf exportation.
*
* Returns: %TRUE if the allocator support exporting dma-buf.
*
* Since: 1.24
*/
gboolean
gst_drm_dumb_allocator_has_prime_export (GstAllocator * base_alloc)
{
#ifdef HAVE_LIBDRM
GstDRMDumbAllocator *alloc = GST_DRM_DUMB_ALLOCATOR (base_alloc);
gint ret;
guint64 has_prime = 0;
if (!check_drm_fd (alloc))
return FALSE;
ret = drmGetCap (alloc->drm_fd, DRM_CAP_PRIME, &has_prime);
if (ret)
GST_WARNING_OBJECT (alloc, "could not get prime capability");
return !!(has_prime & DRM_PRIME_CAP_EXPORT);
#else
return FALSE;
#endif
}