Commit c98f92ee authored by Matt Fischer's avatar Matt Fischer Committed by Tim-Philipp Müller
Browse files

gldownload: Add dmabuf exporting

This patch adds code to gldownload to export the image as a
dmabuf if requested.  The element now exposes memory:DMABuf as
a cap feature, and if it is selected, the element exports the
texture to an EGL image and then a dmabuf. It also implements a
fallback to system memory download in case the exportation failed.

https://bugzilla.gnome.org/show_bug.cgi?id=776927
parent b5dee0fe
......@@ -23,6 +23,11 @@
#endif
#include <gst/gl/gl.h>
#if GST_GL_HAVE_PLATFORM_EGL && GST_GL_HAVE_DMABUF
#include <gst/gl/egl/gsteglimage.h>
#include <gst/allocators/gstdmabuf.h>
#endif
#include "gstgldownloadelement.h"
GST_DEBUG_CATEGORY_STATIC (gst_gl_download_element_debug);
......@@ -45,12 +50,19 @@ gst_gl_download_element_prepare_output_buffer (GstBaseTransform * bt,
GstBuffer * buffer, GstBuffer ** outbuf);
static GstFlowReturn gst_gl_download_element_transform (GstBaseTransform * bt,
GstBuffer * buffer, GstBuffer * outbuf);
static gboolean gst_gl_download_element_decide_allocation (GstBaseTransform *
trans, GstQuery * query);
static void gst_gl_download_element_finalize (GObject * object);
static GstStaticPadTemplate gst_gl_download_element_src_pad_template =
GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("video/x-raw; video/x-raw(memory:GLMemory)"));
GST_STATIC_CAPS (
#if GST_GL_HAVE_PLATFORM_EGL && GST_GL_HAVE_DMABUF
"video/x-raw(" GST_CAPS_FEATURE_MEMORY_DMABUF "); "
#endif
"video/x-raw; video/x-raw(memory:GLMemory)"));
static GstStaticPadTemplate gst_gl_download_element_sink_pad_template =
GST_STATIC_PAD_TEMPLATE ("sink",
......@@ -63,6 +75,7 @@ gst_gl_download_element_class_init (GstGLDownloadElementClass * klass)
{
GstBaseTransformClass *bt_class = GST_BASE_TRANSFORM_CLASS (klass);
GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
GObjectClass *object_class = G_OBJECT_CLASS (klass);
bt_class->transform_caps = gst_gl_download_element_transform_caps;
bt_class->set_caps = gst_gl_download_element_set_caps;
......@@ -70,6 +83,7 @@ gst_gl_download_element_class_init (GstGLDownloadElementClass * klass)
bt_class->prepare_output_buffer =
gst_gl_download_element_prepare_output_buffer;
bt_class->transform = gst_gl_download_element_transform;
bt_class->decide_allocation = gst_gl_download_element_decide_allocation;
bt_class->passthrough_on_same_caps = TRUE;
......@@ -81,6 +95,8 @@ gst_gl_download_element_class_init (GstGLDownloadElementClass * klass)
gst_element_class_set_metadata (element_class,
"OpenGL downloader", "Filter/Video",
"Downloads data from OpenGL", "Matthew Waters <matthew@centricular.com>");
object_class->finalize = gst_gl_download_element_finalize;
}
static void
......@@ -103,8 +119,26 @@ gst_gl_download_element_set_caps (GstBaseTransform * bt, GstCaps * in_caps,
features = gst_caps_get_features (out_caps, 0);
dl->do_pbo_transfers = (!features || gst_caps_features_contains (features,
GST_CAPS_FEATURE_MEMORY_SYSTEM_MEMORY));
dl->do_pbo_transfers = FALSE;
if (dl->dmabuf_allocator) {
gst_object_unref (GST_OBJECT (dl->dmabuf_allocator));
dl->dmabuf_allocator = NULL;
}
if (!features) {
dl->do_pbo_transfers = TRUE;
return TRUE;
}
if (gst_caps_features_contains (features, GST_CAPS_FEATURE_MEMORY_GL_MEMORY)) {
/* do nothing with the buffer */
} else if (gst_caps_features_contains (features,
GST_CAPS_FEATURE_MEMORY_DMABUF)) {
dl->dmabuf_allocator = gst_dmabuf_allocator_new ();
} else if (gst_caps_features_contains (features,
GST_CAPS_FEATURE_MEMORY_SYSTEM_MEMORY)) {
dl->do_pbo_transfers = TRUE;
}
return TRUE;
}
......@@ -133,8 +167,16 @@ gst_gl_download_element_transform_caps (GstBaseTransform * bt,
tmp = _set_caps_features (caps, GST_CAPS_FEATURE_MEMORY_GL_MEMORY);
tmp = gst_caps_merge (gst_caps_ref (caps), tmp);
} else {
tmp = _set_caps_features (caps, GST_CAPS_FEATURE_MEMORY_SYSTEM_MEMORY);
tmp = gst_caps_merge (gst_caps_ref (caps), tmp);
GstCaps *newcaps;
tmp = gst_caps_ref (caps);
#if GST_GL_HAVE_PLATFORM_EGL && GST_GL_HAVE_DMABUF
newcaps = _set_caps_features (caps, GST_CAPS_FEATURE_MEMORY_DMABUF);
tmp = gst_caps_merge (tmp, newcaps);
#endif
newcaps = _set_caps_features (caps, GST_CAPS_FEATURE_MEMORY_SYSTEM_MEMORY);
tmp = gst_caps_merge (tmp, newcaps);
}
if (filter) {
......@@ -163,6 +205,168 @@ gst_gl_download_element_get_unit_size (GstBaseTransform * trans, GstCaps * caps,
return TRUE;
}
#if GST_GL_HAVE_PLATFORM_EGL && GST_GL_HAVE_DMABUF
struct DmabufInfo
{
GstMemory *dmabuf;
gint stride;
gsize offset;
};
static void
_free_dmabuf_info (struct DmabufInfo *info)
{
gst_memory_unref (info->dmabuf);
g_free (info);
}
static GQuark
_dmabuf_info_quark (void)
{
static GQuark quark = 0;
if (!quark)
quark = g_quark_from_static_string ("GstGLDownloadDmabufInfo");
return quark;
}
static struct DmabufInfo *
_get_cached_dmabuf_info (GstGLMemory * mem)
{
return gst_mini_object_get_qdata (GST_MINI_OBJECT (mem),
_dmabuf_info_quark ());
}
static void
_set_cached_dmabuf_info (GstGLMemory * mem, struct DmabufInfo *info)
{
return gst_mini_object_set_qdata (GST_MINI_OBJECT (mem),
_dmabuf_info_quark (), info, (GDestroyNotify) _free_dmabuf_info);
}
struct DmabufTransfer
{
GstGLDownloadElement *download;
GstGLMemory *glmem;
struct DmabufInfo *info;
};
static void
_create_cached_dmabuf_info (GstGLContext * context, gpointer data)
{
struct DmabufTransfer *transfer = (struct DmabufTransfer *) data;
GstEGLImage *image;
image = gst_egl_image_from_texture (context, transfer->glmem, NULL);
if (image) {
int fd;
gint stride;
gsize offset;
if (gst_egl_image_export_dmabuf (image, &fd, &stride, &offset)) {
GstGLDownloadElement *download = transfer->download;
struct DmabufInfo *info;
gsize maxsize;
gst_memory_get_sizes (GST_MEMORY_CAST (transfer->glmem), NULL, &maxsize);
info = g_new0 (struct DmabufInfo, 1);
info->dmabuf =
gst_dmabuf_allocator_alloc (download->dmabuf_allocator, fd, maxsize);
info->stride = stride;
info->offset = offset;
transfer->info = info;
}
gst_egl_image_unref (image);
}
}
static GstBuffer *
_try_export_dmabuf (GstGLDownloadElement * download, GstBuffer * inbuf)
{
GstGLMemory *glmem;
GstBuffer *buffer = NULL;
int i;
gsize offset[GST_VIDEO_MAX_PLANES];
gint stride[GST_VIDEO_MAX_PLANES];
GstCaps *src_caps;
GstVideoInfo out_info;
gsize total_offset;
glmem = GST_GL_MEMORY_CAST (gst_buffer_peek_memory (inbuf, 0));
if (glmem) {
GstGLContext *context = GST_GL_BASE_MEMORY_CAST (glmem)->context;
if (gst_gl_context_get_gl_platform (context) != GST_GL_PLATFORM_EGL)
return NULL;
}
buffer = gst_buffer_new ();
total_offset = 0;
for (i = 0; i < gst_buffer_n_memory (inbuf); i++) {
struct DmabufInfo *info;
glmem = GST_GL_MEMORY_CAST (gst_buffer_peek_memory (inbuf, i));
info = _get_cached_dmabuf_info (glmem);
if (!info) {
GstGLContext *context = GST_GL_BASE_MEMORY_CAST (glmem)->context;
struct DmabufTransfer transfer;
transfer.download = download;
transfer.glmem = glmem;
transfer.info = NULL;
gst_gl_context_thread_add (context, _create_cached_dmabuf_info,
&transfer);
info = transfer.info;
if (info)
_set_cached_dmabuf_info (glmem, info);
}
if (info) {
offset[i] = total_offset + info->offset;
stride[i] = info->stride;
total_offset += gst_memory_get_sizes (info->dmabuf, NULL, NULL);
gst_buffer_insert_memory (buffer, -1, gst_memory_ref (info->dmabuf));
} else {
gst_buffer_unref (buffer);
buffer = NULL;
goto export_complete;
}
}
src_caps = gst_pad_get_current_caps (GST_BASE_TRANSFORM (download)->srcpad);
gst_video_info_from_caps (&out_info, src_caps);
if (download->add_videometa) {
gst_buffer_add_video_meta_full (buffer, out_info.flags,
out_info.finfo->format, out_info.width, out_info.height,
out_info.finfo->n_planes, offset, stride);
} else {
int i;
gboolean match = TRUE;
for (i = 0; i < gst_buffer_n_memory (inbuf); i++) {
if (offset[i] != out_info.offset[i] || stride[i] != out_info.stride[i]) {
match = FALSE;
break;
}
}
if (!match) {
gst_buffer_unref (buffer);
buffer = NULL;
}
}
export_complete:
return buffer;
}
#endif /* GST_GL_HAVE_PLATFORM_EGL && GST_GL_HAVE_DMABUF */
static GstFlowReturn
gst_gl_download_element_prepare_output_buffer (GstBaseTransform * bt,
GstBuffer * inbuf, GstBuffer ** outbuf)
......@@ -181,6 +385,38 @@ gst_gl_download_element_prepare_output_buffer (GstBaseTransform * bt,
gst_gl_memory_pbo_download_transfer ((GstGLMemoryPBO *) mem);
}
}
#if GST_GL_HAVE_PLATFORM_EGL && GST_GL_HAVE_DMABUF
else if (dl->dmabuf_allocator) {
GstBuffer *buffer = _try_export_dmabuf (dl, inbuf);
if (buffer) {
if (GST_BASE_TRANSFORM_GET_CLASS (bt)->copy_metadata)
if (!GST_BASE_TRANSFORM_GET_CLASS (bt)->copy_metadata (bt, inbuf,
buffer)) {
GST_ELEMENT_WARNING (GST_ELEMENT (bt), STREAM, NOT_IMPLEMENTED,
("could not copy metadata"), (NULL));
}
*outbuf = buffer;
} else {
GstCaps *src_caps;
GstCapsFeatures *features;
gst_object_unref (dl->dmabuf_allocator);
dl->dmabuf_allocator = NULL;
src_caps = gst_pad_get_current_caps (bt->srcpad);
src_caps = gst_caps_make_writable (src_caps);
features = gst_caps_get_features (src_caps, 0);
gst_caps_features_remove (features, GST_CAPS_FEATURE_MEMORY_DMABUF);
if (!gst_base_transform_update_src_caps (bt, src_caps)) {
GST_ERROR_OBJECT (bt, "DMABuf exportation didn't work and system "
"memory is not supported.");
return GST_FLOW_NOT_NEGOTIATED;
}
}
}
#endif
return GST_FLOW_OK;
}
......@@ -191,3 +427,32 @@ gst_gl_download_element_transform (GstBaseTransform * bt,
{
return GST_FLOW_OK;
}
static gboolean
gst_gl_download_element_decide_allocation (GstBaseTransform * trans,
GstQuery * query)
{
GstGLDownloadElement *download = GST_GL_DOWNLOAD_ELEMENT_CAST (trans);
if (gst_query_find_allocation_meta (query, GST_VIDEO_META_API_TYPE, NULL)) {
download->add_videometa = TRUE;
} else {
download->add_videometa = FALSE;
}
return GST_BASE_TRANSFORM_CLASS (parent_class)->decide_allocation (trans,
query);
}
static void
gst_gl_download_element_finalize (GObject * object)
{
GstGLDownloadElement *download = GST_GL_DOWNLOAD_ELEMENT_CAST (object);
if (download->dmabuf_allocator) {
gst_object_unref (GST_OBJECT (download->dmabuf_allocator));
download->dmabuf_allocator = NULL;
}
G_OBJECT_CLASS (parent_class)->finalize (object);
}
......@@ -45,6 +45,8 @@ struct _GstGLDownloadElement
GstGLBaseFilter parent;
gboolean do_pbo_transfers;
GstAllocator * dmabuf_allocator;
gboolean add_videometa;
};
struct _GstGLDownloadElementClass
......
......@@ -469,4 +469,63 @@ gst_egl_image_from_dmabuf (GstGLContext * context,
return gst_egl_image_new_wrapped (context, img, format, NULL,
(GstEGLImageDestroyNotify) _destroy_egl_image);
}
gboolean
gst_egl_image_export_dmabuf (GstEGLImage * image, int *fd, gint * stride,
gsize * offset)
{
EGLBoolean (*gst_eglExportDMABUFImageQueryMESA) (EGLDisplay dpy,
EGLImageKHR image, int *fourcc, int *num_planes,
EGLuint64KHR * modifiers);
EGLBoolean (*gst_eglExportDMABUFImageMESA) (EGLDisplay dpy, EGLImageKHR image,
int *fds, EGLint * strides, EGLint * offsets);
GstGLDisplayEGL *display_egl;
EGLDisplay egl_display = EGL_DEFAULT_DISPLAY;
int num_planes = 0;
int egl_fd = 0;
EGLint egl_stride = 0;
EGLint egl_offset = 0;
gst_eglExportDMABUFImageQueryMESA =
gst_gl_context_get_proc_address (image->context,
"eglExportDMABUFImageQueryMESA");
gst_eglExportDMABUFImageMESA =
gst_gl_context_get_proc_address (image->context,
"eglExportDMABUFImageMESA");
if (!gst_eglExportDMABUFImageQueryMESA || !gst_eglExportDMABUFImageMESA)
return FALSE;
display_egl =
(GstGLDisplayEGL *) gst_gl_display_egl_from_gl_display (image->
context->display);
if (!display_egl) {
GST_WARNING_OBJECT (image->context,
"Failed to retrieve GstGLDisplayEGL from %" GST_PTR_FORMAT,
image->context->display);
return FALSE;
}
egl_display =
(EGLDisplay) gst_gl_display_get_handle (GST_GL_DISPLAY (display_egl));
gst_object_unref (display_egl);
if (!gst_eglExportDMABUFImageQueryMESA (egl_display, image->image,
NULL, &num_planes, NULL))
return FALSE;
/* Don't allow multi-plane dmabufs */
if (num_planes > 1)
return FALSE;
if (!gst_eglExportDMABUFImageMESA (egl_display, image->image, &egl_fd,
&egl_stride, &egl_offset))
return FALSE;
*fd = egl_fd;
*stride = egl_stride;
*offset = egl_offset;
return TRUE;
}
#endif /* GST_GL_HAVE_DMABUF */
......@@ -88,6 +88,8 @@ GstEGLImage * gst_egl_image_from_dmabuf (GstGLContext *
GstVideoInfo * in_info,
gint plane,
gsize offset);
GST_EXPORT
gboolean gst_egl_image_export_dmabuf (GstEGLImage *image, int *fd, gint *stride, gsize *offset);
#endif
/**
......
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