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gstreamer/subprojects/gst-plugins-good/sys/v4l2/gstv4l2allocator.c
Philipp Zabel 46a41667a3 v4l2bufferpool: Ensure freshly created buffers are not marked as queued 
Otherwise, if we run in to the copy case, this can cause these
groups to stay around with queued flag set, but never actually
queued, until gst_v4l2_allocator_flush() is called, which then
erroneously frees the associated memories, causing the release
function to decrement the allocator refcount where it was never
incremented, resulting in early allocator disposal, and either
deadlock or use after free.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/6552>
2024-04-18 16:42:43 +00:00

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/*
* Copyright (C) 2014 Collabora Ltd.
* Author: Nicolas Dufresne <nicolas.dufresne@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.
*
*/
#include "config.h"
#ifndef _GNU_SOURCE
# define _GNU_SOURCE /* O_CLOEXEC */
#endif
#include "ext/videodev2.h"
#include "gstv4l2object.h"
#include "gstv4l2allocator.h"
#include <gst/allocators/gstdmabuf.h>
#include <fcntl.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/mman.h>
#include <unistd.h>
#define GST_V4L2_MEMORY_TYPE "V4l2Memory"
#define gst_v4l2_allocator_parent_class parent_class
G_DEFINE_TYPE (GstV4l2Allocator, gst_v4l2_allocator, GST_TYPE_ALLOCATOR);
GST_DEBUG_CATEGORY_STATIC (v4l2allocator_debug);
#define GST_CAT_DEFAULT v4l2allocator_debug
#define UNSET_QUEUED(buffer) \
((buffer).flags &= ~(V4L2_BUF_FLAG_QUEUED | V4L2_BUF_FLAG_DONE))
#define SET_QUEUED(buffer) ((buffer).flags |= V4L2_BUF_FLAG_QUEUED)
#define IS_QUEUED(buffer) \
((buffer).flags & (V4L2_BUF_FLAG_QUEUED | V4L2_BUF_FLAG_DONE))
enum
{
GROUP_RELEASED,
LAST_SIGNAL
};
static guint gst_v4l2_allocator_signals[LAST_SIGNAL] = { 0 };
static void gst_v4l2_allocator_release (GstV4l2Allocator * allocator,
GstV4l2Memory * mem);
static const gchar *
memory_type_to_str (guint32 memory)
{
switch (memory) {
case V4L2_MEMORY_MMAP:
return "mmap";
case V4L2_MEMORY_USERPTR:
return "userptr";
case V4L2_MEMORY_DMABUF:
return "dmabuf";
default:
return "unknown";
}
}
/*************************************/
/* GstV4lMemory implementation */
/*************************************/
static gpointer
_v4l2mem_map (GstV4l2Memory * mem, gsize maxsize, GstMapFlags flags)
{
gpointer data = NULL;
switch (mem->group->buffer.memory) {
case V4L2_MEMORY_MMAP:
case V4L2_MEMORY_USERPTR:
data = mem->data;
break;
case V4L2_MEMORY_DMABUF:
/* v4l2 dmabuf memory are not shared with downstream */
g_assert_not_reached ();
break;
default:
GST_WARNING ("Unknown memory type %i", mem->group->buffer.memory);
break;
}
return data;
}
static gboolean
_v4l2mem_unmap (GstV4l2Memory * mem)
{
gboolean ret = FALSE;
switch (mem->group->buffer.memory) {
case V4L2_MEMORY_MMAP:
case V4L2_MEMORY_USERPTR:
ret = TRUE;
break;
case V4L2_MEMORY_DMABUF:
/* v4l2 dmabuf memory are not share with downstream */
g_assert_not_reached ();
break;
default:
GST_WARNING ("Unknown memory type %i", mem->group->buffer.memory);
break;
}
return ret;
}
static gboolean
_v4l2mem_dispose (GstV4l2Memory * mem)
{
GstV4l2Allocator *allocator = (GstV4l2Allocator *) mem->mem.allocator;
GstV4l2MemoryGroup *group = mem->group;
gboolean ret;
if (group->mem[mem->plane]) {
/* We may have a dmabuf, replace it with returned original memory */
group->mem[mem->plane] = gst_memory_ref ((GstMemory *) mem);
gst_v4l2_allocator_release (allocator, mem);
ret = FALSE;
} else {
gst_object_ref (allocator);
ret = TRUE;
}
return ret;
}
static inline GstV4l2Memory *
_v4l2mem_new (GstMemoryFlags flags, GstAllocator * allocator,
GstMemory * parent, gsize maxsize, gsize align, gsize offset, gsize size,
gint plane, gpointer data, int dmafd, GstV4l2MemoryGroup * group)
{
GstV4l2Memory *mem;
mem = g_new0 (GstV4l2Memory, 1);
gst_memory_init (GST_MEMORY_CAST (mem),
flags, allocator, parent, maxsize, align, offset, size);
if (parent == NULL)
mem->mem.mini_object.dispose =
(GstMiniObjectDisposeFunction) _v4l2mem_dispose;
mem->plane = plane;
mem->data = data;
mem->dmafd = dmafd;
mem->group = group;
return mem;
}
static GstV4l2Memory *
_v4l2mem_share (GstV4l2Memory * mem, gssize offset, gsize size)
{
GstV4l2Memory *sub;
GstMemory *parent;
/* find the real parent */
if ((parent = mem->mem.parent) == NULL)
parent = (GstMemory *) mem;
if (size == -1)
size = mem->mem.size - offset;
/* the shared memory is always readonly */
sub = _v4l2mem_new (GST_MINI_OBJECT_FLAGS (parent) |
GST_MINI_OBJECT_FLAG_LOCK_READONLY, mem->mem.allocator, parent,
mem->mem.maxsize, mem->mem.align, offset, size, mem->plane, mem->data,
-1, mem->group);
return sub;
}
static gboolean
_v4l2mem_is_span (GstV4l2Memory * mem1, GstV4l2Memory * mem2, gsize * offset)
{
if (offset)
*offset = mem1->mem.offset - mem1->mem.parent->offset;
/* and memory is contiguous */
return mem1->mem.offset + mem1->mem.size == mem2->mem.offset;
}
gboolean
gst_is_v4l2_memory (GstMemory * mem)
{
return gst_memory_is_type (mem, GST_V4L2_MEMORY_TYPE);
}
GQuark
gst_v4l2_memory_quark (void)
{
static GQuark quark = 0;
if (quark == 0)
quark = g_quark_from_string ("GstV4l2Memory");
return quark;
}
/*************************************/
/* GstV4l2MemoryGroup implementation */
/*************************************/
static void
gst_v4l2_memory_group_free (GstV4l2MemoryGroup * group)
{
gint i;
for (i = 0; i < group->n_mem; i++) {
GstMemory *mem = group->mem[i];
group->mem[i] = NULL;
if (mem)
gst_memory_unref (mem);
}
g_free (group);
}
static GstV4l2MemoryGroup *
gst_v4l2_memory_group_new (GstV4l2Allocator * allocator, guint32 index)
{
GstV4l2Object *obj = allocator->obj;
guint32 memory = allocator->memory;
struct v4l2_format *format = &obj->format;
GstV4l2MemoryGroup *group;
gsize img_size, buf_size;
group = g_new0 (GstV4l2MemoryGroup, 1);
group->buffer.type = format->type;
group->buffer.index = index;
group->buffer.memory = memory;
if (V4L2_TYPE_IS_MULTIPLANAR (format->type)) {
group->n_mem = group->buffer.length = format->fmt.pix_mp.num_planes;
group->buffer.m.planes = group->planes;
} else {
group->n_mem = 1;
}
if (obj->ioctl (obj->video_fd, VIDIOC_QUERYBUF, &group->buffer) < 0)
goto querybuf_failed;
if (group->buffer.index != index) {
GST_ERROR_OBJECT (allocator, "Buffer index returned by VIDIOC_QUERYBUF "
"didn't match, this indicate the presence of a bug in your driver or "
"libv4l2");
g_free (group);
return NULL;
}
if (IS_QUEUED (group->buffer)) {
GST_WARNING_OBJECT (allocator,
"Driver pretends buffer %d is queued even if freshly created, "
"this indicates a bug in the driver.", group->buffer.index);
UNSET_QUEUED (group->buffer);
}
/* Check that provided size matches the format we have negotiation. Failing
* there usually means a driver of libv4l bug. */
if (V4L2_TYPE_IS_MULTIPLANAR (obj->type)) {
gint i;
for (i = 0; i < group->n_mem; i++) {
img_size = obj->format.fmt.pix_mp.plane_fmt[i].sizeimage;
buf_size = group->planes[i].length;
if (buf_size < img_size)
goto buffer_too_short;
}
} else {
img_size = obj->format.fmt.pix.sizeimage;
buf_size = group->buffer.length;
if (buf_size < img_size)
goto buffer_too_short;
}
/* We save non planar buffer information into the multi-planar plane array
* to avoid duplicating the code later */
if (!V4L2_TYPE_IS_MULTIPLANAR (format->type)) {
group->planes[0].bytesused = group->buffer.bytesused;
group->planes[0].length = group->buffer.length;
group->planes[0].data_offset = 0;
g_assert (sizeof (group->planes[0].m) == sizeof (group->buffer.m));
memcpy (&group->planes[0].m, &group->buffer.m, sizeof (group->buffer.m));
}
GST_LOG_OBJECT (allocator, "Got %s buffer", memory_type_to_str (memory));
GST_LOG_OBJECT (allocator, " index: %u", group->buffer.index);
GST_LOG_OBJECT (allocator, " type: %d", group->buffer.type);
GST_LOG_OBJECT (allocator, " flags: %08x", group->buffer.flags);
GST_LOG_OBJECT (allocator, " field: %d", group->buffer.field);
GST_LOG_OBJECT (allocator, " memory: %d", group->buffer.memory);
GST_LOG_OBJECT (allocator, " planes: %d", group->n_mem);
#ifndef GST_DISABLE_GST_DEBUG
if (memory == V4L2_MEMORY_MMAP) {
gint i;
for (i = 0; i < group->n_mem; i++) {
GST_LOG_OBJECT (allocator,
" [%u] bytesused: %u, length: %u, offset: %u", i,
group->planes[i].bytesused, group->planes[i].length,
group->planes[i].data_offset);
GST_LOG_OBJECT (allocator, " [%u] MMAP offset: %u", i,
group->planes[i].m.mem_offset);
}
}
#endif
return group;
querybuf_failed:
{
GST_ERROR ("error querying buffer %d: %s", index, g_strerror (errno));
goto failed;
}
buffer_too_short:
{
GST_ERROR ("buffer size %" G_GSIZE_FORMAT
" is smaller then negotiated size %" G_GSIZE_FORMAT
", this is usually the result of a bug in the v4l2 driver or libv4l.",
buf_size, img_size);
goto failed;
}
failed:
gst_v4l2_memory_group_free (group);
return NULL;
}
/*************************************/
/* GstV4lAllocator implementation */
/*************************************/
static void
gst_v4l2_allocator_release (GstV4l2Allocator * allocator, GstV4l2Memory * mem)
{
GstV4l2MemoryGroup *group = mem->group;
GST_LOG_OBJECT (allocator, "plane %i of buffer %u released",
mem->plane, group->buffer.index);
switch (allocator->memory) {
case V4L2_MEMORY_DMABUF:
mem->dmafd = -1;
break;
case V4L2_MEMORY_USERPTR:
mem->data = NULL;
break;
default:
break;
}
/* When all memory are back, put the group back in the free queue */
if (g_atomic_int_dec_and_test (&group->mems_allocated)) {
GST_LOG_OBJECT (allocator, "buffer %u released", group->buffer.index);
gst_atomic_queue_push (allocator->free_queue, group);
g_signal_emit (allocator, gst_v4l2_allocator_signals[GROUP_RELEASED], 0);
}
/* Keep last, allocator may be freed after this call */
gst_object_unref (allocator);
}
static void
gst_v4l2_allocator_free (GstAllocator * gallocator, GstMemory * gmem)
{
GstV4l2Allocator *allocator = (GstV4l2Allocator *) gallocator;
GstV4l2Object *obj = allocator->obj;
GstV4l2Memory *mem = (GstV4l2Memory *) gmem;
GstV4l2MemoryGroup *group = mem->group;
/* Only free unparented memory */
if (mem->mem.parent == NULL) {
GST_LOG_OBJECT (allocator, "freeing plane %i of buffer %u",
mem->plane, group->buffer.index);
if (allocator->memory == V4L2_MEMORY_MMAP) {
if (mem->data)
obj->munmap (mem->data, group->planes[mem->plane].length);
}
if (allocator->memory == V4L2_MEMORY_MMAP && mem->dmafd >= 0)
close (mem->dmafd);
}
g_free (mem);
}
static void
gst_v4l2_allocator_dispose (GObject * obj)
{
GstV4l2Allocator *allocator = (GstV4l2Allocator *) obj;
gint i;
GST_LOG_OBJECT (obj, "called");
for (i = 0; i < allocator->count; i++) {
GstV4l2MemoryGroup *group = allocator->groups[i];
allocator->groups[i] = NULL;
if (group)
gst_v4l2_memory_group_free (group);
}
G_OBJECT_CLASS (parent_class)->dispose (obj);
}
static void
gst_v4l2_allocator_finalize (GObject * obj)
{
GstV4l2Allocator *allocator = (GstV4l2Allocator *) obj;
GST_LOG_OBJECT (obj, "called");
gst_atomic_queue_unref (allocator->free_queue);
gst_object_unref (allocator->obj->element);
G_OBJECT_CLASS (parent_class)->finalize (obj);
}
static void
gst_v4l2_allocator_class_init (GstV4l2AllocatorClass * klass)
{
GObjectClass *object_class;
GstAllocatorClass *allocator_class;
allocator_class = (GstAllocatorClass *) klass;
object_class = (GObjectClass *) klass;
allocator_class->alloc = NULL;
allocator_class->free = gst_v4l2_allocator_free;
object_class->dispose = gst_v4l2_allocator_dispose;
object_class->finalize = gst_v4l2_allocator_finalize;
gst_v4l2_allocator_signals[GROUP_RELEASED] = g_signal_new ("group-released",
G_TYPE_FROM_CLASS (object_class), G_SIGNAL_RUN_LAST, 0, NULL, NULL, NULL,
G_TYPE_NONE, 0);
GST_DEBUG_CATEGORY_INIT (v4l2allocator_debug, "v4l2allocator", 0,
"V4L2 Allocator");
}
static void
gst_v4l2_allocator_init (GstV4l2Allocator * allocator)
{
GstAllocator *alloc = GST_ALLOCATOR_CAST (allocator);
alloc->mem_type = GST_V4L2_MEMORY_TYPE;
alloc->mem_map = (GstMemoryMapFunction) _v4l2mem_map;
alloc->mem_unmap = (GstMemoryUnmapFunction) _v4l2mem_unmap;
alloc->mem_share = (GstMemoryShareFunction) _v4l2mem_share;
alloc->mem_is_span = (GstMemoryIsSpanFunction) _v4l2mem_is_span;
/* Use the default, fallback copy function */
allocator->free_queue = gst_atomic_queue_new (VIDEO_MAX_FRAME);
GST_OBJECT_FLAG_SET (allocator, GST_ALLOCATOR_FLAG_CUSTOM_ALLOC);
}
#define GST_V4L2_ALLOCATOR_PROBE(obj,type) \
gst_v4l2_allocator_probe ((obj), V4L2_MEMORY_ ## type, \
GST_V4L2_ALLOCATOR_FLAG_ ## type ## _REQBUFS, \
GST_V4L2_ALLOCATOR_FLAG_ ## type ## _CREATE_BUFS)
static guint32
gst_v4l2_allocator_probe (GstV4l2Allocator * allocator, guint32 memory,
guint32 breq_flag, guint32 bcreate_flag)
{
GstV4l2Object *obj = allocator->obj;
struct v4l2_requestbuffers breq = { 0 };
guint32 flags = 0;
breq.type = obj->type;
breq.count = 0;
breq.memory = memory;
if (obj->ioctl (obj->video_fd, VIDIOC_REQBUFS, &breq) == 0) {
struct v4l2_create_buffers bcreate = { 0 };
flags |= breq_flag;
bcreate.memory = memory;
bcreate.format = obj->format;
if ((obj->ioctl (obj->video_fd, VIDIOC_CREATE_BUFS, &bcreate) == 0))
flags |= bcreate_flag;
}
if (breq.capabilities & V4L2_BUF_CAP_SUPPORTS_ORPHANED_BUFS)
flags |= GST_V4L2_ALLOCATOR_FLAG_SUPPORTS_ORPHANED_BUFS;
return flags;
}
static GstV4l2MemoryGroup *
gst_v4l2_allocator_create_buf (GstV4l2Allocator * allocator)
{
GstV4l2Object *obj = allocator->obj;
struct v4l2_create_buffers bcreate = { 0 };
GstV4l2MemoryGroup *group = NULL;
GST_OBJECT_LOCK (allocator);
if (!g_atomic_int_get (&allocator->active))
goto done;
if (GST_V4L2_ALLOCATOR_IS_ORPHANED (allocator))
goto orphaned_bug;
bcreate.memory = allocator->memory;
bcreate.format = obj->format;
bcreate.count = 1;
if (!allocator->can_allocate)
goto done;
if (obj->ioctl (obj->video_fd, VIDIOC_CREATE_BUFS, &bcreate) < 0)
goto create_bufs_failed;
if (allocator->groups[bcreate.index] != NULL)
goto create_bufs_bug;
group = gst_v4l2_memory_group_new (allocator, bcreate.index);
if (group) {
allocator->groups[bcreate.index] = group;
allocator->count++;
}
done:
GST_OBJECT_UNLOCK (allocator);
return group;
orphaned_bug:
{
GST_ERROR_OBJECT (allocator, "allocator was orphaned, "
"not creating new buffers");
goto done;
}
create_bufs_failed:
{
GST_WARNING_OBJECT (allocator, "error creating a new buffer: %s",
g_strerror (errno));
goto done;
}
create_bufs_bug:
{
GST_ERROR_OBJECT (allocator, "created buffer has already used buffer "
"index %i, this means there is an bug in your driver or libv4l2",
bcreate.index);
goto done;
}
}
static GstV4l2MemoryGroup *
gst_v4l2_allocator_alloc (GstV4l2Allocator * allocator)
{
GstV4l2MemoryGroup *group;
if (!g_atomic_int_get (&allocator->active))
return NULL;
group = gst_atomic_queue_pop (allocator->free_queue);
if (group == NULL) {
if (allocator->can_allocate) {
group = gst_v4l2_allocator_create_buf (allocator);
/* Don't hammer on CREATE_BUFS */
if (group == NULL)
allocator->can_allocate = FALSE;
}
}
return group;
}
static void
gst_v4l2_allocator_reset_size (GstV4l2Allocator * allocator,
GstV4l2MemoryGroup * group)
{
gint i;
for (i = 0; i < group->n_mem; i++) {
group->mem[i]->maxsize = group->planes[i].length;
group->mem[i]->offset = 0;
group->mem[i]->size = group->planes[i].length;
}
}
static void
_cleanup_failed_alloc (GstV4l2Allocator * allocator, GstV4l2MemoryGroup * group)
{
if (group->mems_allocated > 0) {
gint i;
/* If one or more mmap worked, we need to unref the memory, otherwise
* they will keep a ref on the allocator and leak it. This will put back
* the group into the free_queue */
for (i = 0; i < group->n_mem; i++)
gst_memory_unref (group->mem[i]);
} else {
/* Otherwise, group has to be on free queue for _stop() to work */
gst_atomic_queue_push (allocator->free_queue, group);
}
}
GstV4l2Allocator *
gst_v4l2_allocator_new (GstObject * parent, GstV4l2Object * v4l2object)
{
GstV4l2Allocator *allocator;
guint32 flags = 0;
gchar *name, *parent_name;
parent_name = gst_object_get_name (parent);
name = g_strconcat (parent_name, ":allocator", NULL);
g_free (parent_name);
allocator = g_object_new (GST_TYPE_V4L2_ALLOCATOR, "name", name, NULL);
gst_object_ref_sink (allocator);
g_free (name);
/* Save everything */
allocator->obj = v4l2object;
/* Keep a ref on the element so obj does not disappear */
gst_object_ref (allocator->obj->element);
flags |= GST_V4L2_ALLOCATOR_PROBE (allocator, MMAP);
flags |= GST_V4L2_ALLOCATOR_PROBE (allocator, USERPTR);
flags |= GST_V4L2_ALLOCATOR_PROBE (allocator, DMABUF);
if (flags == 0) {
/* Drivers not ported from videobuf to videbuf2 don't allow freeing buffers
* using REQBUFS(0). This is a workaround to still support these drivers,
* which are known to have MMAP support. */
GST_WARNING_OBJECT (allocator, "Could not probe supported memory type, "
"assuming MMAP is supported, this is expected for older drivers not "
" yet ported to videobuf2 framework");
flags = GST_V4L2_ALLOCATOR_FLAG_MMAP_REQBUFS;
}
GST_OBJECT_FLAG_SET (allocator, flags);
return allocator;
}
guint
gst_v4l2_allocator_start (GstV4l2Allocator * allocator, guint32 count,
guint32 memory)
{
GstV4l2Object *obj = allocator->obj;
struct v4l2_requestbuffers breq = { count, obj->type, memory };
gboolean can_allocate;
gint i;
g_return_val_if_fail (count != 0, 0);
GST_OBJECT_LOCK (allocator);
if (g_atomic_int_get (&allocator->active))
goto already_active;
if (GST_V4L2_ALLOCATOR_IS_ORPHANED (allocator))
goto orphaned;
if (obj->ioctl (obj->video_fd, VIDIOC_REQBUFS, &breq) < 0)
goto reqbufs_failed;
if (breq.count < 1)
goto out_of_memory;
switch (memory) {
case V4L2_MEMORY_MMAP:
can_allocate = GST_V4L2_ALLOCATOR_CAN_ALLOCATE (allocator, MMAP);
break;
case V4L2_MEMORY_USERPTR:
can_allocate = GST_V4L2_ALLOCATOR_CAN_ALLOCATE (allocator, USERPTR);
break;
case V4L2_MEMORY_DMABUF:
can_allocate = GST_V4L2_ALLOCATOR_CAN_ALLOCATE (allocator, DMABUF);
break;
default:
can_allocate = FALSE;
break;
}
GST_DEBUG_OBJECT (allocator, "allocated %u %s buffers out of %u requested",
breq.count, memory_type_to_str (memory), count);
allocator->can_allocate = can_allocate;
allocator->count = breq.count;
allocator->memory = memory;
/* Create memory groups */
for (i = 0; i < allocator->count; i++) {
allocator->groups[i] = gst_v4l2_memory_group_new (allocator, i);
if (allocator->groups[i] == NULL)
goto error;
gst_atomic_queue_push (allocator->free_queue, allocator->groups[i]);
}
g_atomic_int_set (&allocator->active, TRUE);
done:
GST_OBJECT_UNLOCK (allocator);
return breq.count;
already_active:
{
GST_ERROR_OBJECT (allocator, "allocator already active");
goto error;
}
orphaned:
{
GST_ERROR_OBJECT (allocator, "allocator was orphaned");
goto error;
}
reqbufs_failed:
{
GST_ERROR_OBJECT (allocator,
"error requesting %d buffers: %s", count, g_strerror (errno));
goto error;
}
out_of_memory:
{
GST_ERROR_OBJECT (allocator, "Not enough memory to allocate buffers");
goto error;
}
error:
{
breq.count = 0;
goto done;
}
}
GstV4l2Return
gst_v4l2_allocator_stop (GstV4l2Allocator * allocator)
{
GstV4l2Object *obj = allocator->obj;
struct v4l2_requestbuffers breq = { 0, obj->type, allocator->memory };
gint i = 0;
GstV4l2Return ret = GST_V4L2_OK;
GST_DEBUG_OBJECT (allocator, "stop allocator");
GST_OBJECT_LOCK (allocator);
if (!g_atomic_int_get (&allocator->active))
goto done;
if (gst_atomic_queue_length (allocator->free_queue) != allocator->count) {
GST_DEBUG_OBJECT (allocator, "allocator is still in use");
ret = GST_V4L2_BUSY;
goto done;
}
while (gst_atomic_queue_pop (allocator->free_queue)) {
/* nothing */
};
for (i = 0; i < allocator->count; i++) {
GstV4l2MemoryGroup *group = allocator->groups[i];
allocator->groups[i] = NULL;
if (group)
gst_v4l2_memory_group_free (group);
}
if (!GST_V4L2_ALLOCATOR_IS_ORPHANED (allocator)) {
/* Not all drivers support rebufs(0), so warn only */
if (obj->ioctl (obj->video_fd, VIDIOC_REQBUFS, &breq) < 0)
GST_WARNING_OBJECT (allocator,
"error releasing buffers buffers: %s", g_strerror (errno));
}
allocator->count = 0;
g_atomic_int_set (&allocator->active, FALSE);
done:
GST_OBJECT_UNLOCK (allocator);
return ret;
}
gboolean
gst_v4l2_allocator_orphan (GstV4l2Allocator * allocator)
{
GstV4l2Object *obj = allocator->obj;
struct v4l2_requestbuffers breq = { 0, obj->type, allocator->memory };
if (!GST_V4L2_ALLOCATOR_CAN_ORPHAN_BUFS (allocator))
return FALSE;
GST_OBJECT_FLAG_SET (allocator, GST_V4L2_ALLOCATOR_FLAG_ORPHANED);
if (!g_atomic_int_get (&allocator->active))
return TRUE;
if (obj->ioctl (obj->video_fd, VIDIOC_REQBUFS, &breq) < 0) {
GST_ERROR_OBJECT (allocator,
"error orphaning buffers buffers: %s", g_strerror (errno));
return FALSE;
}
return TRUE;
}
GstV4l2MemoryGroup *
gst_v4l2_allocator_alloc_mmap (GstV4l2Allocator * allocator)
{
GstV4l2Object *obj = allocator->obj;
GstV4l2MemoryGroup *group;
gint i;
g_return_val_if_fail (allocator->memory == V4L2_MEMORY_MMAP, NULL);
group = gst_v4l2_allocator_alloc (allocator);
if (group == NULL)
return NULL;
for (i = 0; i < group->n_mem; i++) {
if (group->mem[i] == NULL) {
gpointer data;
data = obj->mmap (NULL, group->planes[i].length, PROT_READ | PROT_WRITE,
MAP_SHARED, obj->video_fd, group->planes[i].m.mem_offset);
if (data == MAP_FAILED)
goto mmap_failed;
GST_LOG_OBJECT (allocator,
"mmap buffer length %d, data offset %d, plane %d",
group->planes[i].length, group->planes[i].data_offset, i);
group->mem[i] = (GstMemory *) _v4l2mem_new (0, GST_ALLOCATOR (allocator),
NULL, group->planes[i].length, 0, 0, group->planes[i].length, i, data,
-1, group);
} else {
/* Take back the allocator reference */
gst_object_ref (allocator);
}
group->mems_allocated++;
}
/* Ensure group size. Unlike GST, v4l2 have size (bytesused) initially set
* to 0. As length might be bigger then the expected size exposed in the
* format, we simply set bytesused initially and reset it here for
* simplicity */
gst_v4l2_allocator_reset_size (allocator, group);
return group;
mmap_failed:
{
GST_ERROR_OBJECT (allocator, "Failed to mmap buffer: %s",
g_strerror (errno));
_cleanup_failed_alloc (allocator, group);
return NULL;
}
}
GstV4l2MemoryGroup *
gst_v4l2_allocator_alloc_dmabuf (GstV4l2Allocator * allocator,
GstAllocator * dmabuf_allocator)
{
GstV4l2Object *obj = allocator->obj;
GstV4l2MemoryGroup *group;
gint i;
g_return_val_if_fail (allocator->memory == V4L2_MEMORY_MMAP, NULL);
group = gst_v4l2_allocator_alloc (allocator);
if (group == NULL)
return NULL;
for (i = 0; i < group->n_mem; i++) {
GstV4l2Memory *mem;
GstMemory *dma_mem;
if (group->mem[i] == NULL) {
struct v4l2_exportbuffer expbuf = { 0 };
expbuf.type = obj->type;
expbuf.index = group->buffer.index;
expbuf.plane = i;
expbuf.flags = O_CLOEXEC | O_RDWR;
if (obj->ioctl (obj->video_fd, VIDIOC_EXPBUF, &expbuf) < 0)
goto expbuf_failed;
GST_LOG_OBJECT (allocator, "exported DMABUF as fd %i plane %d",
expbuf.fd, i);
group->mem[i] = (GstMemory *) _v4l2mem_new (0, GST_ALLOCATOR (allocator),
NULL, group->planes[i].length, 0, group->planes[i].data_offset,
group->planes[i].length - group->planes[i].data_offset, i, NULL,
expbuf.fd, group);
} else {
/* Take back the allocator reference */
gst_object_ref (allocator);
}
group->mems_allocated++;
g_assert (gst_is_v4l2_memory (group->mem[i]));
mem = (GstV4l2Memory *) group->mem[i];
dma_mem = gst_fd_allocator_alloc (dmabuf_allocator, mem->dmafd,
group->planes[i].length, GST_FD_MEMORY_FLAG_DONT_CLOSE);
gst_memory_resize (dma_mem, group->planes[i].data_offset,
group->planes[i].length - group->planes[i].data_offset);
gst_mini_object_set_qdata (GST_MINI_OBJECT (dma_mem),
GST_V4L2_MEMORY_QUARK, mem, (GDestroyNotify) gst_memory_unref);
group->mem[i] = dma_mem;
}
gst_v4l2_allocator_reset_size (allocator, group);
return group;
expbuf_failed:
{
GST_ERROR_OBJECT (allocator, "Failed to export DMABUF: %s",
g_strerror (errno));
goto cleanup;
}
cleanup:
{
_cleanup_failed_alloc (allocator, group);
return NULL;
}
}
static void
gst_v4l2_allocator_clear_dmabufin (GstV4l2Allocator * allocator,
GstV4l2MemoryGroup * group)
{
GstV4l2Object *obj = allocator->obj;
GstV4l2Memory *mem;
gint i;
g_return_if_fail (allocator->memory == V4L2_MEMORY_DMABUF);
for (i = 0; i < group->n_mem; i++) {
mem = (GstV4l2Memory *) group->mem[i];
GST_LOG_OBJECT (allocator, "[%i] clearing DMABUF import, fd %i plane %d",
group->buffer.index, mem->dmafd, i);
/* Update memory */
mem->mem.maxsize = 0;
mem->mem.offset = 0;
mem->mem.size = 0;
mem->dmafd = -1;
/* Update v4l2 structure */
group->planes[i].length = 0;
group->planes[i].bytesused = 0;
group->planes[i].m.fd = -1;
group->planes[i].data_offset = 0;
}
if (!V4L2_TYPE_IS_MULTIPLANAR (obj->type)) {
group->buffer.bytesused = 0;
group->buffer.length = 0;
group->buffer.m.fd = -1;
}
}
GstV4l2MemoryGroup *
gst_v4l2_allocator_alloc_dmabufin (GstV4l2Allocator * allocator)
{
GstV4l2MemoryGroup *group;
gint i;
g_return_val_if_fail (allocator->memory == V4L2_MEMORY_DMABUF, NULL);
group = gst_v4l2_allocator_alloc (allocator);
if (group == NULL)
return NULL;
GST_LOG_OBJECT (allocator, "allocating empty DMABUF import group");
for (i = 0; i < group->n_mem; i++) {
if (group->mem[i] == NULL) {
group->mem[i] = (GstMemory *) _v4l2mem_new (0, GST_ALLOCATOR (allocator),
NULL, 0, 0, 0, 0, i, NULL, -1, group);
} else {
/* Take back the allocator reference */
gst_object_ref (allocator);
}
group->mems_allocated++;
}
gst_v4l2_allocator_clear_dmabufin (allocator, group);
return group;
}
static void
gst_v4l2_allocator_clear_userptr (GstV4l2Allocator * allocator,
GstV4l2MemoryGroup * group)
{
GstV4l2Object *obj = allocator->obj;
GstV4l2Memory *mem;
gint i;
g_return_if_fail (allocator->memory == V4L2_MEMORY_USERPTR);
for (i = 0; i < group->n_mem; i++) {
mem = (GstV4l2Memory *) group->mem[i];
GST_LOG_OBJECT (allocator, "[%i] clearing USERPTR %p plane %d size %"
G_GSIZE_FORMAT, group->buffer.index, mem->data, i, mem->mem.size);
mem->mem.maxsize = 0;
mem->mem.size = 0;
mem->data = NULL;
group->planes[i].length = 0;
group->planes[i].bytesused = 0;
group->planes[i].m.userptr = 0;
}
if (!V4L2_TYPE_IS_MULTIPLANAR (obj->type)) {
group->buffer.bytesused = 0;
group->buffer.length = 0;
group->buffer.m.userptr = 0;
}
}
GstV4l2MemoryGroup *
gst_v4l2_allocator_alloc_userptr (GstV4l2Allocator * allocator)
{
GstV4l2MemoryGroup *group;
gint i;
g_return_val_if_fail (allocator->memory == V4L2_MEMORY_USERPTR, NULL);
group = gst_v4l2_allocator_alloc (allocator);
if (group == NULL)
return NULL;
GST_LOG_OBJECT (allocator, "allocating empty USERPTR group");
for (i = 0; i < group->n_mem; i++) {
if (group->mem[i] == NULL) {
group->mem[i] = (GstMemory *) _v4l2mem_new (0, GST_ALLOCATOR (allocator),
NULL, 0, 0, 0, 0, i, NULL, -1, group);
} else {
/* Take back the allocator reference */
gst_object_ref (allocator);
}
group->mems_allocated++;
}
gst_v4l2_allocator_clear_userptr (allocator, group);
return group;
}
gboolean
gst_v4l2_allocator_import_dmabuf (GstV4l2Allocator * allocator,
GstV4l2MemoryGroup * group, gint n_mem, GstMemory ** dma_mem)
{
GstV4l2Object *obj = allocator->obj;
GstV4l2Memory *mem;
gint i;
g_return_val_if_fail (allocator->memory == V4L2_MEMORY_DMABUF, FALSE);
if (group->n_mem != n_mem)
goto n_mem_missmatch;
for (i = 0; i < group->n_mem; i++) {
gint dmafd;
gsize size, offset, maxsize;
if (!gst_is_dmabuf_memory (dma_mem[i]))
goto not_dmabuf;
size = gst_memory_get_sizes (dma_mem[i], &offset, &maxsize);
dmafd = gst_dmabuf_memory_get_fd (dma_mem[i]);
GST_LOG_OBJECT (allocator, "[%i] imported DMABUF as fd %i plane %d",
group->buffer.index, dmafd, i);
mem = (GstV4l2Memory *) group->mem[i];
/* Update memory */
mem->mem.maxsize = maxsize;
mem->mem.offset = offset;
mem->mem.size = size;
mem->dmafd = dmafd;
/* Update v4l2 structure */
group->planes[i].length = maxsize;
group->planes[i].bytesused = size + offset;
group->planes[i].m.fd = dmafd;
group->planes[i].data_offset = offset;
}
/* Copy into buffer structure if not using planes */
if (!V4L2_TYPE_IS_MULTIPLANAR (obj->type)) {
group->buffer.bytesused = group->planes[0].bytesused;
group->buffer.length = group->planes[0].length;
group->buffer.m.fd = group->planes[0].m.fd;
/* FIXME Check if data_offset > 0 and fail for non-multi-planar */
g_assert (group->planes[0].data_offset == 0);
} else {
group->buffer.length = group->n_mem;
}
return TRUE;
n_mem_missmatch:
{
GST_ERROR_OBJECT (allocator, "Got %i dmabuf but needed %i", n_mem,
group->n_mem);
return FALSE;
}
not_dmabuf:
{
GST_ERROR_OBJECT (allocator, "Memory %i is not of DMABUF", i);
return FALSE;
}
}
gboolean
gst_v4l2_allocator_import_userptr (GstV4l2Allocator * allocator,
GstV4l2MemoryGroup * group, gsize img_size, int n_planes,
gpointer * data, gsize * size)
{
GstV4l2Object *obj = allocator->obj;
GstV4l2Memory *mem;
gint i;
g_return_val_if_fail (allocator->memory == V4L2_MEMORY_USERPTR, FALSE);
/* TODO Support passing N plane from 1 memory to MPLANE v4l2 format */
if (V4L2_TYPE_IS_MULTIPLANAR (obj->type) && n_planes != group->n_mem)
goto n_mem_missmatch;
for (i = 0; i < group->n_mem; i++) {
gsize maxsize, psize;
/* TODO request used size and maxsize separately */
if (V4L2_TYPE_IS_MULTIPLANAR (obj->type))
maxsize = psize = size[i];
else
maxsize = psize = img_size;
g_assert (psize <= img_size);
GST_LOG_OBJECT (allocator, "[%i] imported USERPTR %p plane %d size %"
G_GSIZE_FORMAT, group->buffer.index, data[i], i, psize);
mem = (GstV4l2Memory *) group->mem[i];
mem->mem.maxsize = maxsize;
mem->mem.size = psize;
mem->data = data[i];
group->planes[i].length = maxsize;
group->planes[i].bytesused = psize;
group->planes[i].m.userptr = (unsigned long) data[i];
group->planes[i].data_offset = 0;
}
/* Copy into buffer structure if not using planes */
if (!V4L2_TYPE_IS_MULTIPLANAR (obj->type)) {
group->buffer.bytesused = group->planes[0].bytesused;
group->buffer.length = group->planes[0].length;
group->buffer.m.userptr = group->planes[0].m.userptr;
} else {
group->buffer.length = group->n_mem;
}
return TRUE;
n_mem_missmatch:
{
GST_ERROR_OBJECT (allocator, "Got %i userptr plane while driver need %i",
n_planes, group->n_mem);
return FALSE;
}
}
void
gst_v4l2_allocator_flush (GstV4l2Allocator * allocator)
{
gint i;
GST_OBJECT_LOCK (allocator);
if (!g_atomic_int_get (&allocator->active))
goto done;
for (i = 0; i < allocator->count; i++) {
GstV4l2MemoryGroup *group = allocator->groups[i];
gint n;
if (IS_QUEUED (group->buffer)) {
UNSET_QUEUED (group->buffer);
gst_v4l2_allocator_reset_group (allocator, group);
for (n = 0; n < group->n_mem; n++)
gst_memory_unref (group->mem[n]);
}
}
done:
GST_OBJECT_UNLOCK (allocator);
}
gboolean
gst_v4l2_allocator_qbuf (GstV4l2Allocator * allocator,
GstV4l2MemoryGroup * group)
{
GstV4l2Object *obj = allocator->obj;
gboolean ret = TRUE;
gint i;
g_return_val_if_fail (g_atomic_int_get (&allocator->active), FALSE);
/* update sizes */
if (V4L2_TYPE_IS_MULTIPLANAR (obj->type)) {
for (i = 0; i < group->n_mem; i++)
group->planes[i].bytesused =
gst_memory_get_sizes (group->mem[i], NULL, NULL);
} else {
group->buffer.bytesused = gst_memory_get_sizes (group->mem[0], NULL, NULL);
}
/* Ensure the memory will stay around and is RO */
for (i = 0; i < group->n_mem; i++)
gst_memory_ref (group->mem[i]);
if (obj->ioctl (obj->video_fd, VIDIOC_QBUF, &group->buffer) < 0) {
GST_ERROR_OBJECT (allocator, "failed queueing buffer %i: %s",
group->buffer.index, g_strerror (errno));
/* Release the memory, possibly making it RW again */
for (i = 0; i < group->n_mem; i++)
gst_memory_unref (group->mem[i]);
ret = FALSE;
if (IS_QUEUED (group->buffer)) {
GST_DEBUG_OBJECT (allocator,
"driver pretends buffer is queued even if queue failed");
UNSET_QUEUED (group->buffer);
}
goto done;
}
GST_LOG_OBJECT (allocator, "queued buffer %i (flags 0x%X)",
group->buffer.index, group->buffer.flags);
if (!IS_QUEUED (group->buffer)) {
GST_DEBUG_OBJECT (allocator,
"driver pretends buffer is not queued even if queue succeeded");
SET_QUEUED (group->buffer);
}
done:
return ret;
}
GstFlowReturn
gst_v4l2_allocator_dqbuf (GstV4l2Allocator * allocator,
GstV4l2MemoryGroup ** group_out)
{
GstV4l2Object *obj = allocator->obj;
struct v4l2_buffer buffer = { 0 };
struct v4l2_plane planes[VIDEO_MAX_PLANES] = { {0} };
gint i;
GstV4l2MemoryGroup *group = NULL;
g_return_val_if_fail (g_atomic_int_get (&allocator->active), GST_FLOW_ERROR);
buffer.type = obj->type;
buffer.memory = allocator->memory;
if (V4L2_TYPE_IS_MULTIPLANAR (obj->type)) {
buffer.length = obj->format.fmt.pix_mp.num_planes;
buffer.m.planes = planes;
}
if (obj->ioctl (obj->video_fd, VIDIOC_DQBUF, &buffer) < 0)
goto error;
group = allocator->groups[buffer.index];
if (!IS_QUEUED (group->buffer)) {
GST_ERROR_OBJECT (allocator,
"buffer %i was not queued, this indicate a driver bug.", buffer.index);
return GST_FLOW_ERROR;
}
group->buffer = buffer;
GST_LOG_OBJECT (allocator, "dequeued buffer %i (flags 0x%X)", buffer.index,
buffer.flags);
if (IS_QUEUED (group->buffer)) {
GST_DEBUG_OBJECT (allocator,
"driver pretends buffer is queued even if dequeue succeeded");
UNSET_QUEUED (group->buffer);
}
if (V4L2_TYPE_IS_MULTIPLANAR (obj->type)) {
group->buffer.m.planes = group->planes;
memcpy (group->planes, buffer.m.planes, sizeof (planes));
} else {
group->planes[0].bytesused = group->buffer.bytesused;
group->planes[0].length = group->buffer.length;
g_assert (sizeof (group->planes[0].m) == sizeof (group->buffer.m));
memcpy (&group->planes[0].m, &group->buffer.m, sizeof (group->buffer.m));
}
/* And update memory size */
if (V4L2_TYPE_IS_OUTPUT (obj->type)) {
gst_v4l2_allocator_reset_size (allocator, group);
} else {
/* for capture, simply read the size */
for (i = 0; i < group->n_mem; i++) {
gsize size, offset;
GST_LOG_OBJECT (allocator,
"Dequeued capture buffer, length: %u bytesused: %u data_offset: %u",
group->planes[i].length, group->planes[i].bytesused,
group->planes[i].data_offset);
offset = group->planes[i].data_offset;
if (group->planes[i].bytesused >= group->planes[i].data_offset) {
size = group->planes[i].bytesused - group->planes[i].data_offset;
} else {
GST_WARNING_OBJECT (allocator, "V4L2 provided buffer has bytesused %"
G_GUINT32_FORMAT " which is too small to include data_offset %"
G_GUINT32_FORMAT, group->planes[i].bytesused,
group->planes[i].data_offset);
size = group->planes[i].bytesused;
}
if (G_LIKELY (size + offset <= group->mem[i]->maxsize))
gst_memory_resize (group->mem[i], offset, size);
else {
GST_WARNING_OBJECT (allocator,
"v4l2 provided buffer that is too big for the memory it was "
"writing into. v4l2 claims %" G_GSIZE_FORMAT " bytes used but "
"memory is only %" G_GSIZE_FORMAT "B. This is probably a driver "
"bug.", size, group->mem[i]->maxsize);
gst_memory_resize (group->mem[i], 0, group->mem[i]->maxsize);
}
}
}
/* Release the memory, possibly making it RW again */
for (i = 0; i < group->n_mem; i++)
gst_memory_unref (group->mem[i]);
*group_out = group;
return GST_FLOW_OK;
error:
if (errno == EPIPE) {
GST_DEBUG_OBJECT (allocator, "broken pipe signals last buffer");
return GST_V4L2_FLOW_LAST_BUFFER;
}
GST_ERROR_OBJECT (allocator, "failed dequeuing a %s buffer: %s",
memory_type_to_str (allocator->memory), g_strerror (errno));
switch (errno) {
case EAGAIN:
GST_WARNING_OBJECT (allocator,
"Non-blocking I/O has been selected using O_NONBLOCK and"
" no buffer was in the outgoing queue.");
break;
case EINVAL:
GST_ERROR_OBJECT (allocator,
"The buffer type is not supported, or the index is out of bounds, "
"or no buffers have been allocated yet, or the userptr "
"or length are invalid.");
break;
case ENOMEM:
GST_ERROR_OBJECT (allocator,
"insufficient memory to enqueue a user pointer buffer");
break;
case EIO:
GST_INFO_OBJECT (allocator,
"VIDIOC_DQBUF failed due to an internal error."
" Can also indicate temporary problems like signal loss."
" Note the driver might dequeue an (empty) buffer despite"
" returning an error, or even stop capturing.");
/* have we de-queued a buffer ? */
if (!IS_QUEUED (buffer)) {
GST_DEBUG_OBJECT (allocator, "reenqueueing buffer");
/* FIXME ... should we do something here? */
}
break;
case EINTR:
GST_WARNING_OBJECT (allocator, "could not sync on a buffer on device");
break;
default:
GST_WARNING_OBJECT (allocator,
"Grabbing frame got interrupted unexpectedly. %d: %s.", errno,
g_strerror (errno));
break;
}
return GST_FLOW_ERROR;
}
void
gst_v4l2_allocator_reset_group (GstV4l2Allocator * allocator,
GstV4l2MemoryGroup * group)
{
switch (allocator->memory) {
case V4L2_MEMORY_USERPTR:
gst_v4l2_allocator_clear_userptr (allocator, group);
break;
case V4L2_MEMORY_DMABUF:
gst_v4l2_allocator_clear_dmabufin (allocator, group);
break;
case V4L2_MEMORY_MMAP:
break;
default:
g_assert_not_reached ();
break;
}
gst_v4l2_allocator_reset_size (allocator, group);
}
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