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pulsevideo: add gstreamer elements

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Add custom gstreamer elements to pad/depay
Add pv_init() to register new elements
This commit is contained in:
Wim Taymans 2015-04-16 19:45:26 +02:00
parent 3ddd7a60a7
commit 8b02c9040a
14 changed files with 898 additions and 14 deletions
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276
src/gst/gstfdpay.c Normal file
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/* GStreamer
* Copyright (C) 2014 William Manley <will@williammanley.net>
*
* 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 Street, Suite 500,
* Boston, MA 02110-1335, USA.
*/
/**
* SECTION:element-gstfdpay
*
* The tmpfilepay element enables zero-copy passing of buffers between
* processes by allocating memory in a temporary file. This is a proof of
* concept example.
*
* <refsect2>
* <title>Example launch line</title>
* |[
* gst-launch-1.0 -v videotestsrc ! video/x-raw,format=RGB,width=1920,height=1080 \
* ! fdpay ! fdsink fd=1 \
* | gst-launch-1.0 fdsrc fd=0 ! fddepay \
* ! video/x-raw,format=RGB,width=1920,height=1080 ! autovideosink
* ]|
* Video frames are created in the first gst-launch-1.0 process and displayed
* by the second with no copying.
* </refsect2>
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "wire-protocol.h"
#include <gst/gst.h>
#include <gst/allocators/gstfdmemory.h>
#include <gst/base/gstbasetransform.h>
#include "gstfdpay.h"
#include "gsttmpfileallocator.h"
#include <gst/net/gstnetcontrolmessagemeta.h>
#include <gio/gunixfdmessage.h>
#include <fcntl.h>
#include <string.h>
#include <unistd.h>
GST_DEBUG_CATEGORY_STATIC (gst_fdpay_debug_category);
#define GST_CAT_DEFAULT gst_fdpay_debug_category
#define GST_UNREF(x) \
do { \
if ( x ) \
gst_object_unref ( x ); \
x = NULL; \
} while (0);
/* prototypes */
static void gst_fdpay_dispose (GObject * object);
static GstCaps *gst_fdpay_transform_caps (GstBaseTransform * trans,
GstPadDirection direction, GstCaps * caps, GstCaps * filter);
static gboolean gst_fdpay_transform_size (GstBaseTransform *trans,
GstPadDirection direction, GstCaps *caps, gsize size, GstCaps *othercaps,
gsize *othersize);
static gboolean gst_fdpay_propose_allocation (GstBaseTransform * trans,
GstQuery * decide_query, GstQuery * query);
static GstFlowReturn gst_fdpay_transform (GstBaseTransform * trans,
GstBuffer * inbuf, GstBuffer * outbuf);
/* pad templates */
static GstStaticCaps fd_caps = GST_STATIC_CAPS ("application/x-fd");
static GstStaticPadTemplate gst_fdpay_src_template =
GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS ("application/x-fd"));
static GstStaticPadTemplate gst_fdpay_sink_template =
GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS_ANY);
/* class initialization */
G_DEFINE_TYPE_WITH_CODE (GstFdpay, gst_fdpay, GST_TYPE_BASE_TRANSFORM,
GST_DEBUG_CATEGORY_INIT (gst_fdpay_debug_category, "fdpay", 0,
"debug category for fdpay element"));
static void
gst_fdpay_class_init (GstFdpayClass * klass)
{
GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
GstBaseTransformClass *base_transform_class =
GST_BASE_TRANSFORM_CLASS (klass);
/* Setting up pads and setting metadata should be moved to
base_class_init if you intend to subclass this class. */
gst_element_class_add_pad_template (GST_ELEMENT_CLASS (klass),
gst_static_pad_template_get (&gst_fdpay_src_template));
gst_element_class_add_pad_template (GST_ELEMENT_CLASS (klass),
gst_static_pad_template_get (&gst_fdpay_sink_template));
gst_element_class_set_static_metadata (GST_ELEMENT_CLASS (klass),
"Simple FD Payloader", "Generic",
"Simple File-descriptor Payloader for zero-copy video IPC",
"William Manley <will@williammanley.net>");
gobject_class->dispose = gst_fdpay_dispose;
base_transform_class->transform_caps =
GST_DEBUG_FUNCPTR (gst_fdpay_transform_caps);
base_transform_class->propose_allocation =
GST_DEBUG_FUNCPTR (gst_fdpay_propose_allocation);
base_transform_class->transform =
GST_DEBUG_FUNCPTR (gst_fdpay_transform);
base_transform_class->transform_size =
GST_DEBUG_FUNCPTR (gst_fdpay_transform_size);
}
static void
gst_fdpay_init (GstFdpay * fdpay)
{
fdpay->allocator = gst_tmpfile_allocator_new ();
}
void
gst_fdpay_dispose (GObject * object)
{
GstFdpay *fdpay = GST_FDPAY (object);
GST_DEBUG_OBJECT (fdpay, "dispose");
/* clean up as possible. may be called multiple times */
GST_UNREF(fdpay->allocator);
G_OBJECT_CLASS (gst_fdpay_parent_class)->dispose (object);
}
static GstCaps *
gst_fdpay_transform_caps (GstBaseTransform * trans, GstPadDirection direction,
GstCaps * caps, GstCaps * filter)
{
GstFdpay *fdpay = GST_FDPAY (trans);
GstCaps *othercaps;
GST_DEBUG_OBJECT (fdpay, "transform_caps");
if (direction == GST_PAD_SRC) {
/* transform caps going upstream */
othercaps = gst_caps_new_any ();
} else {
/* transform caps going downstream */
othercaps = gst_static_caps_get (&fd_caps);
}
if (filter) {
GstCaps *intersect;
intersect = gst_caps_intersect (othercaps, filter);
gst_caps_unref (othercaps);
return intersect;
} else {
return othercaps;
}
}
static gboolean
gst_fdpay_transform_size (GstBaseTransform *trans, GstPadDirection direction,
GstCaps *caps, gsize size, GstCaps *othercaps, gsize *othersize)
{
if (direction == GST_PAD_SRC) {
/* transform size going upstream - don't know how to do this */
return FALSE;
} else {
/* transform size going downstream */
*othersize = sizeof (FDMessage);
}
return TRUE;
}
/* propose allocation query parameters for input buffers */
static gboolean
gst_fdpay_propose_allocation (GstBaseTransform * trans,
GstQuery * decide_query, GstQuery * query)
{
GstFdpay *fdpay = GST_FDPAY (trans);
GST_DEBUG_OBJECT (fdpay, "propose_allocation");
gst_query_add_allocation_param (query, fdpay->allocator, NULL);
return TRUE;
}
static GstMemory *
gst_fdpay_get_fd_memory (GstFdpay * tmpfilepay, GstBuffer * buffer)
{
GstMemory *mem = NULL;
if (gst_buffer_n_memory (buffer) == 1
&& gst_is_fd_memory (gst_buffer_peek_memory (buffer, 0)))
mem = gst_buffer_get_memory (buffer, 0);
else {
GstMapInfo info;
GstAllocationParams params = {0, 0, 0, 0, { NULL, }};
gsize size = gst_buffer_get_size (buffer);
GST_INFO_OBJECT (tmpfilepay, "Buffer cannot be payloaded without copying");
mem = gst_allocator_alloc (tmpfilepay->allocator, size, &params);
if (!gst_memory_map (mem, &info, GST_MAP_WRITE))
return NULL;
gst_buffer_extract (buffer, 0, info.data, size);
gst_memory_unmap (mem, &info);
}
return mem;
}
static GstFlowReturn
gst_fdpay_transform (GstBaseTransform * trans, GstBuffer * inbuf,
GstBuffer * outbuf)
{
GstFdpay *fdpay = GST_FDPAY (trans);
GstMemory *fdmem = NULL;
GstMapInfo info;
GError *err = NULL;
GSocketControlMessage *fdmsg = NULL;
FDMessage msg = { 0, 0 };
GST_DEBUG_OBJECT (fdpay, "transform_ip");
fdmem = gst_fdpay_get_fd_memory (fdpay, inbuf);
msg.size = fdmem->size;
msg.offset = fdmem->offset;
fdmsg = g_unix_fd_message_new ();
if (!g_unix_fd_message_append_fd ((GUnixFDMessage*) fdmsg,
gst_fd_memory_get_fd (fdmem), &err)) {
goto append_fd_failed;
}
gst_memory_unref(fdmem);
fdmem = NULL;
gst_buffer_add_net_control_message_meta (outbuf, fdmsg);
g_clear_object (&fdmsg);
gst_buffer_map (outbuf, &info, GST_MAP_WRITE);
memcpy (info.data, &msg, sizeof (msg));
gst_buffer_unmap (outbuf, &info);
return GST_FLOW_OK;
append_fd_failed:
GST_WARNING_OBJECT (trans, "Appending fd failed: %s", err->message);
gst_memory_unref(fdmem);
g_clear_error (&err);
g_clear_object (&fdmsg);
return GST_FLOW_ERROR;
}