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/* SPDX-License-Identifier: LGPL-2.1-or-later */
/*
* Copyright (C) 2020, Collabora Ltd.
* Author: Nicolas Dufresne <nicolas.dufresne@collabora.com>
*
* gstlibcameraallocator.cpp - GStreamer Custom Allocator
*/
#include "gstlibcameraallocator.h"
#include <libcamera/camera.h>
#include <libcamera/framebuffer_allocator.h>
#include <libcamera/stream.h>
#include "gstlibcamera-utils.h"
using namespace libcamera;
static gboolean gst_libcamera_allocator_release(GstMiniObject *mini_object);
/**
* \struct FrameWrap
* \brief An internal wrapper to track the relation between FrameBuffer and
* GstMemory(s)
*
* This wrapper maintains a count of the outstanding GstMemory (there may be
* multiple GstMemory per FrameBuffer), and give back the FrameBuffer to the
* allocator pool when all memory objects have returned.
*/
struct FrameWrap {
FrameWrap(GstAllocator *allocator, FrameBuffer *buffer,
gpointer stream);
~FrameWrap();
void acquirePlane() { ++outstandingPlanes_; }
bool releasePlane() { return --outstandingPlanes_ == 0; }
static GQuark getQuark();
gpointer stream_;
FrameBuffer *buffer_;
std::vector<GstMemory *> planes_;
gint outstandingPlanes_;
};
FrameWrap::FrameWrap(GstAllocator *allocator, FrameBuffer *buffer,
gpointer stream)
: stream_(stream),
buffer_(buffer),
outstandingPlanes_(0)
{
for (const FrameBuffer::Plane &plane : buffer->planes()) {
GstMemory *mem = gst_fd_allocator_alloc(allocator, plane.fd.get(),
plane.offset + plane.length,
GST_FD_MEMORY_FLAG_DONT_CLOSE);
gst_memory_resize(mem, plane.offset, plane.length);
gst_mini_object_set_qdata(GST_MINI_OBJECT(mem), getQuark(), this, nullptr);
GST_MINI_OBJECT(mem)->dispose = gst_libcamera_allocator_release;
g_object_unref(mem->allocator);
planes_.push_back(mem);
}
}
FrameWrap::~FrameWrap()
{
for (GstMemory *mem : planes_) {
GST_MINI_OBJECT(mem)->dispose = nullptr;
g_object_ref(mem->allocator);
gst_memory_unref(mem);
}
}
GQuark FrameWrap::getQuark()
{
static gsize frame_quark = 0;
if (g_once_init_enter(&frame_quark)) {
GQuark quark = g_quark_from_string("GstLibcameraFrameWrap");
g_once_init_leave(&frame_quark, quark);
}
return frame_quark;
}
/**
* \struct _GstLibcameraAllocator
* \brief A pooling GstDmaBufAllocator for libcamera
*
* This is a pooling GstDmaBufAllocator implementation. This implementation override
* the dispose function of memory object in order to keep them alive when they
* are disposed by downstream elements.
*/
struct _GstLibcameraAllocator {
GstDmaBufAllocator parent;
FrameBufferAllocator *fb_allocator;
/*
* A hash table using Stream pointer as key and returning a GQueue of
* FrameWrap.
*/
GHashTable *pools;
};
G_DEFINE_TYPE(GstLibcameraAllocator, gst_libcamera_allocator,
GST_TYPE_DMABUF_ALLOCATOR)
static gboolean
gst_libcamera_allocator_release(GstMiniObject *mini_object)
{
GstMemory *mem = GST_MEMORY_CAST(mini_object);
GstLibcameraAllocator *self = GST_LIBCAMERA_ALLOCATOR(mem->allocator);
{
GLibLocker lock(GST_OBJECT(self));
auto *frame = reinterpret_cast<FrameWrap *>(gst_mini_object_get_qdata(mini_object, FrameWrap::getQuark()));
gst_memory_ref(mem);
if (frame->releasePlane()) {
auto *pool = reinterpret_cast<GQueue *>(g_hash_table_lookup(self->pools, frame->stream_));
g_return_val_if_fail(pool, TRUE);
g_queue_push_tail(pool, frame);
}
}
/* Keep last in case we are holding on the last allocator ref. */
g_object_unref(mem->allocator);
/* Return FALSE so that our mini object isn't freed. */
return FALSE;
}
static void
gst_libcamera_allocator_free_pool(gpointer data)
{
GQueue *queue = reinterpret_cast<GQueue *>(data);
FrameWrap *frame;
while ((frame = reinterpret_cast<FrameWrap *>(g_queue_pop_head(queue)))) {
g_warn_if_fail(frame->outstandingPlanes_ == 0);
delete frame;
}
g_queue_free(queue);
}
static void
gst_libcamera_allocator_init(GstLibcameraAllocator *self)
{
self->pools = g_hash_table_new_full(nullptr, nullptr, nullptr,
gst_libcamera_allocator_free_pool);
GST_OBJECT_FLAG_SET(self, GST_ALLOCATOR_FLAG_CUSTOM_ALLOC);
}
static void
gst_libcamera_allocator_dispose(GObject *object)
{
GstLibcameraAllocator *self = GST_LIBCAMERA_ALLOCATOR(object);
if (self->pools) {
g_hash_table_unref(self->pools);
self->pools = nullptr;
}
G_OBJECT_CLASS(gst_libcamera_allocator_parent_class)->dispose(object);
}
static void
gst_libcamera_allocator_finalize(GObject *object)
{
GstLibcameraAllocator *self = GST_LIBCAMERA_ALLOCATOR(object);
delete self->fb_allocator;
G_OBJECT_CLASS(gst_libcamera_allocator_parent_class)->finalize(object);
}
static void
gst_libcamera_allocator_class_init(GstLibcameraAllocatorClass *klass)
{
auto *allocator_class = GST_ALLOCATOR_CLASS(klass);
auto *object_class = G_OBJECT_CLASS(klass);
object_class->dispose = gst_libcamera_allocator_dispose;
object_class->finalize = gst_libcamera_allocator_finalize;
allocator_class->alloc = nullptr;
}
GstLibcameraAllocator *
gst_libcamera_allocator_new(std::shared_ptr<Camera> camera,
CameraConfiguration *config_)
{
auto *self = GST_LIBCAMERA_ALLOCATOR(g_object_new(GST_TYPE_LIBCAMERA_ALLOCATOR,
nullptr));
self->fb_allocator = new FrameBufferAllocator(camera);
for (StreamConfiguration &streamCfg : *config_) {
Stream *stream = streamCfg.stream();
gint ret;
ret = self->fb_allocator->allocate(stream);
if (ret == 0)
return nullptr;
GQueue *pool = g_queue_new();
for (const std::unique_ptr<FrameBuffer> &buffer :
self->fb_allocator->buffers(stream)) {
auto *fb = new FrameWrap(GST_ALLOCATOR(self),
buffer.get(), stream);
g_queue_push_tail(pool, fb);
}
g_hash_table_insert(self->pools, stream, pool);
}
return self;
}
bool
gst_libcamera_allocator_prepare_buffer(GstLibcameraAllocator *self,
Stream *stream, GstBuffer *buffer)
{
GLibLocker lock(GST_OBJECT(self));
auto *pool = reinterpret_cast<GQueue *>(g_hash_table_lookup(self->pools, stream));
g_return_val_if_fail(pool, false);
auto *frame = reinterpret_cast<FrameWrap *>(g_queue_pop_head(pool));
if (!frame)
return false;
for (GstMemory *mem : frame->planes_) {
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