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https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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480 lines
12 KiB
C
480 lines
12 KiB
C
/* GStreamer
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* Copyright (C) <2009> Collabora Ltd
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* @author: Olivier Crete <olivier.crete@collabora.co.uk
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* Copyright (C) <2009> Nokia Inc
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*/
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/**
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* SECTION:element-shmsrc
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* @title: shmsrc
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*
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* Receive data from the shared memory sink.
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*
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* ## Example launch lines
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* |[
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* gst-launch-1.0 shmsrc socket-path=/tmp/blah ! \
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* "video/x-raw, format=YUY2, color-matrix=sdtv, \
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* chroma-site=mpeg2, width=(int)320, height=(int)240, framerate=(fraction)30/1" \
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* ! queue ! videoconvert ! autovideosink
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* ]| Render video from shm buffers.
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*
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include "gstshmsrc.h"
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#include <gst/gst.h>
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#include <string.h>
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/* signals */
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enum
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{
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LAST_SIGNAL
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};
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/* properties */
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enum
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{
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PROP_0,
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PROP_SOCKET_PATH,
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PROP_IS_LIVE,
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PROP_SHM_AREA_NAME
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};
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struct GstShmBuffer
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{
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char *buf;
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GstShmPipe *pipe;
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};
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GST_DEBUG_CATEGORY_STATIC (shmsrc_debug);
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#define GST_CAT_DEFAULT shmsrc_debug
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static GstStaticPadTemplate srctemplate = GST_STATIC_PAD_TEMPLATE ("src",
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GST_PAD_SRC,
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GST_PAD_ALWAYS,
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GST_STATIC_CAPS_ANY);
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#define gst_shm_src_parent_class parent_class
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G_DEFINE_TYPE (GstShmSrc, gst_shm_src, GST_TYPE_PUSH_SRC);
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GST_ELEMENT_REGISTER_DEFINE (shmsrc, "shmsrc", GST_RANK_NONE, GST_TYPE_SHM_SRC);
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static void gst_shm_src_set_property (GObject * object, guint prop_id,
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const GValue * value, GParamSpec * pspec);
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static void gst_shm_src_get_property (GObject * object, guint prop_id,
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GValue * value, GParamSpec * pspec);
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static void gst_shm_src_finalize (GObject * object);
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static gboolean gst_shm_src_start (GstBaseSrc * bsrc);
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static gboolean gst_shm_src_stop (GstBaseSrc * bsrc);
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static GstFlowReturn gst_shm_src_create (GstPushSrc * psrc,
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GstBuffer ** outbuf);
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static gboolean gst_shm_src_unlock (GstBaseSrc * bsrc);
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static gboolean gst_shm_src_unlock_stop (GstBaseSrc * bsrc);
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static GstStateChangeReturn gst_shm_src_change_state (GstElement * element,
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GstStateChange transition);
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static void gst_shm_pipe_dec (GstShmPipe * pipe);
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static void
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gst_shm_src_class_init (GstShmSrcClass * klass)
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{
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GObjectClass *gobject_class;
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GstElementClass *gstelement_class;
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GstBaseSrcClass *gstbasesrc_class;
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GstPushSrcClass *gstpush_src_class;
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gobject_class = (GObjectClass *) klass;
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gstelement_class = (GstElementClass *) klass;
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gstbasesrc_class = (GstBaseSrcClass *) klass;
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gstpush_src_class = (GstPushSrcClass *) klass;
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gobject_class->set_property = gst_shm_src_set_property;
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gobject_class->get_property = gst_shm_src_get_property;
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gobject_class->finalize = gst_shm_src_finalize;
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gstelement_class->change_state = gst_shm_src_change_state;
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gstbasesrc_class->start = GST_DEBUG_FUNCPTR (gst_shm_src_start);
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gstbasesrc_class->stop = GST_DEBUG_FUNCPTR (gst_shm_src_stop);
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gstbasesrc_class->unlock = GST_DEBUG_FUNCPTR (gst_shm_src_unlock);
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gstbasesrc_class->unlock_stop = GST_DEBUG_FUNCPTR (gst_shm_src_unlock_stop);
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gstpush_src_class->create = gst_shm_src_create;
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g_object_class_install_property (gobject_class, PROP_SOCKET_PATH,
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g_param_spec_string ("socket-path",
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"Path to the control socket",
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"The path to the control socket used to control the shared memory",
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NULL, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
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g_object_class_install_property (gobject_class, PROP_IS_LIVE,
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g_param_spec_boolean ("is-live", "Is this a live source",
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"True if the element cannot produce data in PAUSED", FALSE,
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G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
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g_object_class_install_property (gobject_class, PROP_SHM_AREA_NAME,
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g_param_spec_string ("shm-area-name",
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"Name of the shared memory area",
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"The name of the shared memory area used to get buffers",
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NULL, G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
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gst_element_class_add_static_pad_template (gstelement_class, &srctemplate);
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gst_element_class_set_static_metadata (gstelement_class,
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"Shared Memory Source",
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"Source",
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"Receive data from the shared memory sink",
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"Olivier Crete <olivier.crete@collabora.co.uk>");
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GST_DEBUG_CATEGORY_INIT (shmsrc_debug, "shmsrc", 0, "Shared Memory Source");
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}
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static void
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gst_shm_src_init (GstShmSrc * self)
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{
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self->poll = gst_poll_new (TRUE);
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gst_poll_fd_init (&self->pollfd);
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}
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static void
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gst_shm_src_finalize (GObject * object)
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{
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GstShmSrc *self = GST_SHM_SRC (object);
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gst_poll_free (self->poll);
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g_free (self->socket_path);
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G_OBJECT_CLASS (parent_class)->finalize (object);
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}
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static void
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gst_shm_src_set_property (GObject * object, guint prop_id,
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const GValue * value, GParamSpec * pspec)
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{
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GstShmSrc *self = GST_SHM_SRC (object);
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switch (prop_id) {
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case PROP_SOCKET_PATH:
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GST_OBJECT_LOCK (object);
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if (self->pipe) {
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GST_WARNING_OBJECT (object, "Can not modify socket path while the "
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"element is playing");
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} else {
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g_free (self->socket_path);
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self->socket_path = g_value_dup_string (value);
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}
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GST_OBJECT_UNLOCK (object);
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break;
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case PROP_IS_LIVE:
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gst_base_src_set_live (GST_BASE_SRC (object),
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g_value_get_boolean (value));
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
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break;
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}
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}
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static void
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gst_shm_src_get_property (GObject * object, guint prop_id,
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GValue * value, GParamSpec * pspec)
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{
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GstShmSrc *self = GST_SHM_SRC (object);
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switch (prop_id) {
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case PROP_SOCKET_PATH:
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GST_OBJECT_LOCK (object);
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g_value_set_string (value, self->socket_path);
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GST_OBJECT_UNLOCK (object);
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break;
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case PROP_IS_LIVE:
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g_value_set_boolean (value, gst_base_src_is_live (GST_BASE_SRC (object)));
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break;
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case PROP_SHM_AREA_NAME:
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GST_OBJECT_LOCK (object);
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if (self->pipe)
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g_value_set_string (value, sp_get_shm_area_name (self->pipe->pipe));
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GST_OBJECT_UNLOCK (object);
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
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break;
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}
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}
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static gboolean
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gst_shm_src_start_reading (GstShmSrc * self)
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{
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GstShmPipe *gstpipe;
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if (!self->socket_path) {
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GST_ELEMENT_ERROR (self, RESOURCE, NOT_FOUND,
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("No path specified for socket."), (NULL));
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return FALSE;
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}
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gstpipe = g_slice_new0 (GstShmPipe);
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gstpipe->use_count = 1;
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gstpipe->src = gst_object_ref (self);
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GST_DEBUG_OBJECT (self, "Opening socket %s", self->socket_path);
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GST_OBJECT_LOCK (self);
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gstpipe->pipe = sp_client_open (self->socket_path);
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GST_OBJECT_UNLOCK (self);
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if (!gstpipe->pipe) {
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GST_ELEMENT_ERROR (self, RESOURCE, OPEN_READ_WRITE,
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("Could not open socket %s: %d %s", self->socket_path, errno,
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strerror (errno)), (NULL));
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gst_shm_pipe_dec (gstpipe);
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return FALSE;
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}
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self->pipe = gstpipe;
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self->unlocked = FALSE;
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gst_poll_set_flushing (self->poll, FALSE);
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gst_poll_fd_init (&self->pollfd);
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self->pollfd.fd = sp_get_fd (self->pipe->pipe);
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gst_poll_add_fd (self->poll, &self->pollfd);
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gst_poll_fd_ctl_read (self->poll, &self->pollfd, TRUE);
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return TRUE;
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}
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static void
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gst_shm_src_stop_reading (GstShmSrc * self)
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{
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GstShmPipe *pipe;
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GST_DEBUG_OBJECT (self, "Stopping %p", self);
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GST_OBJECT_LOCK (self);
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pipe = self->pipe;
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self->pipe = NULL;
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GST_OBJECT_UNLOCK (self);
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if (pipe) {
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gst_shm_pipe_dec (pipe);
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}
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gst_poll_set_flushing (self->poll, TRUE);
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}
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static gboolean
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gst_shm_src_start (GstBaseSrc * bsrc)
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{
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if (gst_base_src_is_live (bsrc))
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return TRUE;
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else
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return gst_shm_src_start_reading (GST_SHM_SRC (bsrc));
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}
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static gboolean
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gst_shm_src_stop (GstBaseSrc * bsrc)
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{
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if (!gst_base_src_is_live (bsrc))
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gst_shm_src_stop_reading (GST_SHM_SRC (bsrc));
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return TRUE;
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}
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static void
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free_buffer (gpointer data)
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{
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struct GstShmBuffer *gsb = data;
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g_return_if_fail (gsb->pipe != NULL);
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g_return_if_fail (gsb->pipe->src != NULL);
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GST_LOG ("Freeing buffer %p", gsb->buf);
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GST_OBJECT_LOCK (gsb->pipe->src);
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sp_client_recv_finish (gsb->pipe->pipe, gsb->buf);
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GST_OBJECT_UNLOCK (gsb->pipe->src);
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gst_shm_pipe_dec (gsb->pipe);
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g_slice_free (struct GstShmBuffer, gsb);
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}
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static GstFlowReturn
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gst_shm_src_create (GstPushSrc * psrc, GstBuffer ** outbuf)
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{
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GstShmSrc *self = GST_SHM_SRC (psrc);
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GstShmPipe *pipe;
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gchar *buf = NULL;
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int rv = 0;
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struct GstShmBuffer *gsb;
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GST_DEBUG_OBJECT (self, "Stopping %p", self);
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GST_OBJECT_LOCK (self);
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pipe = self->pipe;
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if (!pipe) {
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GST_OBJECT_UNLOCK (self);
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return GST_FLOW_FLUSHING;
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} else {
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pipe->use_count++;
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}
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GST_OBJECT_UNLOCK (self);
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do {
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if (gst_poll_wait (self->poll, GST_CLOCK_TIME_NONE) < 0) {
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if (errno == EBUSY)
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goto flushing;
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GST_ELEMENT_ERROR (self, RESOURCE, READ, ("Failed to read from shmsrc"),
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("Poll failed on fd: %s", strerror (errno)));
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goto error;
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}
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if (self->unlocked)
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goto flushing;
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if (gst_poll_fd_has_closed (self->poll, &self->pollfd)) {
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GST_ELEMENT_ERROR (self, RESOURCE, READ, ("Failed to read from shmsrc"),
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("Control socket has closed"));
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goto error;
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}
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if (gst_poll_fd_has_error (self->poll, &self->pollfd)) {
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GST_ELEMENT_ERROR (self, RESOURCE, READ, ("Failed to read from shmsrc"),
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("Control socket has error"));
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goto error;
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}
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if (gst_poll_fd_can_read (self->poll, &self->pollfd)) {
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buf = NULL;
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GST_LOG_OBJECT (self, "Reading from pipe");
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GST_OBJECT_LOCK (self);
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rv = sp_client_recv (pipe->pipe, &buf);
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GST_OBJECT_UNLOCK (self);
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if (rv < 0) {
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GST_ELEMENT_ERROR (self, RESOURCE, READ, ("Failed to read from shmsrc"),
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("Error reading control data: %d", rv));
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goto error;
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}
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}
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} while (buf == NULL);
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GST_LOG_OBJECT (self, "Got buffer %p of size %d", buf, rv);
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gsb = g_slice_new0 (struct GstShmBuffer);
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gsb->buf = buf;
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gsb->pipe = pipe;
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*outbuf = gst_buffer_new_wrapped_full (GST_MEMORY_FLAG_READONLY,
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buf, rv, 0, rv, gsb, free_buffer);
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return GST_FLOW_OK;
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error:
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gst_shm_pipe_dec (pipe);
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return GST_FLOW_ERROR;
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flushing:
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gst_shm_pipe_dec (pipe);
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return GST_FLOW_FLUSHING;
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}
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static GstStateChangeReturn
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gst_shm_src_change_state (GstElement * element, GstStateChange transition)
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{
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GstStateChangeReturn ret = GST_STATE_CHANGE_SUCCESS;
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GstShmSrc *self = GST_SHM_SRC (element);
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switch (transition) {
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case GST_STATE_CHANGE_PAUSED_TO_PLAYING:
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if (gst_base_src_is_live (GST_BASE_SRC (element))) {
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if (!gst_shm_src_start_reading (self))
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return GST_STATE_CHANGE_FAILURE;
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}
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default:
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break;
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}
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ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
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if (ret == GST_STATE_CHANGE_FAILURE)
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return ret;
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switch (transition) {
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case GST_STATE_CHANGE_PLAYING_TO_PAUSED:
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if (gst_base_src_is_live (GST_BASE_SRC (element))) {
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gst_shm_src_unlock (GST_BASE_SRC (element));
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gst_shm_src_stop_reading (self);
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}
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default:
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break;
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}
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return ret;
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}
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static gboolean
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gst_shm_src_unlock (GstBaseSrc * bsrc)
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{
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GstShmSrc *self = GST_SHM_SRC (bsrc);
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self->unlocked = TRUE;
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gst_poll_set_flushing (self->poll, TRUE);
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return TRUE;
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}
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static gboolean
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gst_shm_src_unlock_stop (GstBaseSrc * bsrc)
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{
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GstShmSrc *self = GST_SHM_SRC (bsrc);
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self->unlocked = FALSE;
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gst_poll_set_flushing (self->poll, FALSE);
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return TRUE;
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}
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static void
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gst_shm_pipe_dec (GstShmPipe * pipe)
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{
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g_return_if_fail (pipe);
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g_return_if_fail (pipe->src);
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g_return_if_fail (pipe->use_count > 0);
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GST_OBJECT_LOCK (pipe->src);
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pipe->use_count--;
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if (pipe->use_count > 0) {
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GST_OBJECT_UNLOCK (pipe->src);
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return;
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}
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if (pipe->pipe)
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sp_client_close (pipe->pipe);
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gst_poll_remove_fd (pipe->src->poll, &pipe->src->pollfd);
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gst_poll_fd_init (&pipe->src->pollfd);
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GST_OBJECT_UNLOCK (pipe->src);
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gst_object_unref (pipe->src);
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g_slice_free (GstShmPipe, pipe);
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}
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