| /* GStreamer |
| * Copyright (C) <2009> Collabora Ltd |
| * @author: Olivier Crete <olivier.crete@collabora.co.uk |
| * Copyright (C) <2009> Nokia Inc |
| * |
| * 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., 59 Temple Place - Suite 330, |
| * Boston, MA 02111-1307, USA. |
| */ |
| /** |
| * SECTION:element-shmsrc |
| * |
| * Receive data from the shared memory sink. |
| * |
| * <refsect2> |
| * <title>Example launch lines</title> |
| * |[ |
| * gst-launch shmsrc socket-path=/tmp/blah ! \ |
| * "video/x-raw-yuv, format=(fourcc)YUY2, color-matrix=(string)sdtv, \ |
| * chroma-site=(string)mpeg2, width=(int)320, height=(int)240, framerate=(fraction)30/1" ! autovideosink |
| * ]| Render video from shm buffers. |
| * </refsect2> |
| */ |
| |
| #ifdef HAVE_CONFIG_H |
| #include "config.h" |
| #endif |
| |
| #include "gstshmsrc.h" |
| |
| #include <gst/gst.h> |
| |
| #include <string.h> |
| |
| /* signals */ |
| enum |
| { |
| LAST_SIGNAL |
| }; |
| |
| /* properties */ |
| enum |
| { |
| PROP_0, |
| PROP_SOCKET_PATH, |
| PROP_IS_LIVE |
| }; |
| |
| struct GstShmBuffer |
| { |
| char *buf; |
| GstShmPipe *pipe; |
| }; |
| |
| |
| GST_DEBUG_CATEGORY_STATIC (shmsrc_debug); |
| #define GST_CAT_DEFAULT shmsrc_debug |
| |
| static GstStaticPadTemplate srctemplate = GST_STATIC_PAD_TEMPLATE ("src", |
| GST_PAD_SRC, |
| GST_PAD_ALWAYS, |
| GST_STATIC_CAPS_ANY); |
| |
| #define gst_shm_src_parent_class parent_class |
| G_DEFINE_TYPE (GstShmSrc, gst_shm_src, GST_TYPE_PUSH_SRC); |
| |
| static void gst_shm_src_set_property (GObject * object, guint prop_id, |
| const GValue * value, GParamSpec * pspec); |
| static void gst_shm_src_get_property (GObject * object, guint prop_id, |
| GValue * value, GParamSpec * pspec); |
| static void gst_shm_src_finalize (GObject * object); |
| static gboolean gst_shm_src_start (GstBaseSrc * bsrc); |
| static gboolean gst_shm_src_stop (GstBaseSrc * bsrc); |
| static GstFlowReturn gst_shm_src_create (GstPushSrc * psrc, |
| GstBuffer ** outbuf); |
| static gboolean gst_shm_src_unlock (GstBaseSrc * bsrc); |
| static gboolean gst_shm_src_unlock_stop (GstBaseSrc * bsrc); |
| static GstStateChangeReturn gst_shm_src_change_state (GstElement * element, |
| GstStateChange transition); |
| |
| static void gst_shm_pipe_inc (GstShmPipe * pipe); |
| static void gst_shm_pipe_dec (GstShmPipe * pipe); |
| |
| // static guint gst_shm_src_signals[LAST_SIGNAL] = { 0 }; |
| |
| static void |
| gst_shm_src_class_init (GstShmSrcClass * klass) |
| { |
| GObjectClass *gobject_class; |
| GstElementClass *gstelement_class; |
| GstBaseSrcClass *gstbasesrc_class; |
| GstPushSrcClass *gstpush_src_class; |
| |
| gobject_class = (GObjectClass *) klass; |
| gstelement_class = (GstElementClass *) klass; |
| gstbasesrc_class = (GstBaseSrcClass *) klass; |
| gstpush_src_class = (GstPushSrcClass *) klass; |
| |
| gobject_class->set_property = gst_shm_src_set_property; |
| gobject_class->get_property = gst_shm_src_get_property; |
| gobject_class->finalize = gst_shm_src_finalize; |
| |
| gstelement_class->change_state = gst_shm_src_change_state; |
| |
| gstbasesrc_class->start = GST_DEBUG_FUNCPTR (gst_shm_src_start); |
| gstbasesrc_class->stop = GST_DEBUG_FUNCPTR (gst_shm_src_stop); |
| gstbasesrc_class->unlock = GST_DEBUG_FUNCPTR (gst_shm_src_unlock); |
| gstbasesrc_class->unlock_stop = GST_DEBUG_FUNCPTR (gst_shm_src_unlock_stop); |
| |
| gstpush_src_class->create = gst_shm_src_create; |
| |
| g_object_class_install_property (gobject_class, PROP_SOCKET_PATH, |
| g_param_spec_string ("socket-path", |
| "Path to the control socket", |
| "The path to the control socket used to control the shared memory" |
| " transport", NULL, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); |
| |
| g_object_class_install_property (gobject_class, PROP_IS_LIVE, |
| g_param_spec_boolean ("is-live", "Is this a live source", |
| "True if the element cannot produce data in PAUSED", FALSE, |
| G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS)); |
| |
| gst_element_class_add_pad_template (gstelement_class, |
| gst_static_pad_template_get (&srctemplate)); |
| |
| gst_element_class_set_metadata (gstelement_class, |
| "Shared Memory Source", |
| "Source", |
| "Receive data from the shared memory sink", |
| "Olivier Crete <olivier.crete@collabora.co.uk>"); |
| |
| GST_DEBUG_CATEGORY_INIT (shmsrc_debug, "shmsrc", 0, "Shared Memory Source"); |
| } |
| |
| static void |
| gst_shm_src_init (GstShmSrc * self) |
| { |
| self->poll = gst_poll_new (TRUE); |
| gst_poll_fd_init (&self->pollfd); |
| } |
| |
| static void |
| gst_shm_src_finalize (GObject * object) |
| { |
| GstShmSrc *self = GST_SHM_SRC (object); |
| |
| gst_poll_free (self->poll); |
| |
| G_OBJECT_CLASS (parent_class)->finalize (object); |
| } |
| |
| |
| static void |
| gst_shm_src_set_property (GObject * object, guint prop_id, |
| const GValue * value, GParamSpec * pspec) |
| { |
| GstShmSrc *self = GST_SHM_SRC (object); |
| |
| switch (prop_id) { |
| case PROP_SOCKET_PATH: |
| GST_OBJECT_LOCK (object); |
| if (self->pipe) { |
| GST_WARNING_OBJECT (object, "Can not modify socket path while the " |
| "element is playing"); |
| } else { |
| g_free (self->socket_path); |
| self->socket_path = g_value_dup_string (value); |
| } |
| GST_OBJECT_UNLOCK (object); |
| break; |
| case PROP_IS_LIVE: |
| gst_base_src_set_live (GST_BASE_SRC (object), |
| g_value_get_boolean (value)); |
| break; |
| default: |
| G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); |
| break; |
| } |
| } |
| |
| static void |
| gst_shm_src_get_property (GObject * object, guint prop_id, |
| GValue * value, GParamSpec * pspec) |
| { |
| GstShmSrc *self = GST_SHM_SRC (object); |
| |
| switch (prop_id) { |
| case PROP_SOCKET_PATH: |
| GST_OBJECT_LOCK (object); |
| g_value_set_string (value, self->socket_path); |
| GST_OBJECT_UNLOCK (object); |
| break; |
| case PROP_IS_LIVE: |
| g_value_set_boolean (value, gst_base_src_is_live (GST_BASE_SRC (object))); |
| break; |
| default: |
| G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec); |
| break; |
| } |
| } |
| |
| static gboolean |
| gst_shm_src_start_reading (GstShmSrc * self) |
| { |
| GstShmPipe *gstpipe = g_slice_new0 (GstShmPipe); |
| |
| gstpipe->use_count = 1; |
| gstpipe->src = gst_object_ref (self); |
| |
| if (!self->socket_path) { |
| GST_ELEMENT_ERROR (self, RESOURCE, NOT_FOUND, |
| ("No path specified for socket."), (NULL)); |
| return FALSE; |
| } |
| |
| GST_DEBUG_OBJECT (self, "Opening socket %s", self->socket_path); |
| |
| GST_OBJECT_LOCK (self); |
| gstpipe->pipe = sp_client_open (self->socket_path); |
| GST_OBJECT_UNLOCK (self); |
| |
| if (!gstpipe->pipe) { |
| GST_ELEMENT_ERROR (self, RESOURCE, OPEN_READ_WRITE, |
| ("Could not open socket %s: %d %s", self->socket_path, errno, |
| strerror (errno)), (NULL)); |
| gst_shm_pipe_dec (gstpipe); |
| return FALSE; |
| } |
| |
| self->pipe = gstpipe; |
| |
| gst_poll_set_flushing (self->poll, FALSE); |
| |
| gst_poll_fd_init (&self->pollfd); |
| self->pollfd.fd = sp_get_fd (self->pipe->pipe); |
| gst_poll_add_fd (self->poll, &self->pollfd); |
| gst_poll_fd_ctl_read (self->poll, &self->pollfd, TRUE); |
| |
| return TRUE; |
| } |
| |
| static void |
| gst_shm_src_stop_reading (GstShmSrc * self) |
| { |
| GST_DEBUG_OBJECT (self, "Stopping %p", self); |
| |
| if (self->pipe) { |
| gst_shm_pipe_dec (self->pipe); |
| self->pipe = NULL; |
| } |
| |
| gst_poll_remove_fd (self->poll, &self->pollfd); |
| gst_poll_fd_init (&self->pollfd); |
| |
| gst_poll_set_flushing (self->poll, TRUE); |
| } |
| |
| static gboolean |
| gst_shm_src_start (GstBaseSrc * bsrc) |
| { |
| if (gst_base_src_is_live (bsrc)) |
| return TRUE; |
| else |
| return gst_shm_src_start_reading (GST_SHM_SRC (bsrc)); |
| } |
| |
| static gboolean |
| gst_shm_src_stop (GstBaseSrc * bsrc) |
| { |
| if (!gst_base_src_is_live (bsrc)) |
| gst_shm_src_stop_reading (GST_SHM_SRC (bsrc)); |
| |
| return TRUE; |
| } |
| |
| |
| static void |
| free_buffer (gpointer data) |
| { |
| struct GstShmBuffer *gsb = data; |
| g_return_if_fail (gsb->pipe != NULL); |
| g_return_if_fail (gsb->pipe->src != NULL); |
| |
| GST_LOG ("Freeing buffer %p", gsb->buf); |
| |
| GST_OBJECT_LOCK (gsb->pipe->src); |
| sp_client_recv_finish (gsb->pipe->pipe, gsb->buf); |
| GST_OBJECT_UNLOCK (gsb->pipe->src); |
| |
| gst_shm_pipe_dec (gsb->pipe); |
| |
| g_slice_free (struct GstShmBuffer, gsb); |
| } |
| |
| static GstFlowReturn |
| gst_shm_src_create (GstPushSrc * psrc, GstBuffer ** outbuf) |
| { |
| GstShmSrc *self = GST_SHM_SRC (psrc); |
| gchar *buf = NULL; |
| int rv = 0; |
| struct GstShmBuffer *gsb; |
| |
| do { |
| if (gst_poll_wait (self->poll, GST_CLOCK_TIME_NONE) < 0) { |
| if (errno == EBUSY) |
| return GST_FLOW_FLUSHING; |
| GST_ELEMENT_ERROR (self, RESOURCE, READ, ("Failed to read from shmsrc"), |
| ("Poll failed on fd: %s", strerror (errno))); |
| return GST_FLOW_ERROR; |
| } |
| |
| if (self->unlocked) |
| return GST_FLOW_FLUSHING; |
| |
| if (gst_poll_fd_has_closed (self->poll, &self->pollfd)) { |
| GST_ELEMENT_ERROR (self, RESOURCE, READ, ("Failed to read from shmsrc"), |
| ("Control socket has closed")); |
| return GST_FLOW_ERROR; |
| } |
| |
| if (gst_poll_fd_has_error (self->poll, &self->pollfd)) { |
| GST_ELEMENT_ERROR (self, RESOURCE, READ, ("Failed to read from shmsrc"), |
| ("Control socket has error")); |
| return GST_FLOW_ERROR; |
| } |
| |
| if (gst_poll_fd_can_read (self->poll, &self->pollfd)) { |
| buf = NULL; |
| GST_LOG_OBJECT (self, "Reading from pipe"); |
| GST_OBJECT_LOCK (self); |
| rv = sp_client_recv (self->pipe->pipe, &buf); |
| GST_OBJECT_UNLOCK (self); |
| if (rv < 0) { |
| GST_ELEMENT_ERROR (self, RESOURCE, READ, ("Failed to read from shmsrc"), |
| ("Error reading control data: %d", rv)); |
| return GST_FLOW_ERROR; |
| } |
| } |
| } while (buf == NULL); |
| |
| GST_LOG_OBJECT (self, "Got buffer %p of size %d", buf, rv); |
| |
| gsb = g_slice_new0 (struct GstShmBuffer); |
| gsb->buf = buf; |
| gsb->pipe = self->pipe; |
| gst_shm_pipe_inc (self->pipe); |
| |
| *outbuf = gst_buffer_new (); |
| gst_buffer_append_memory (*outbuf, |
| gst_memory_new_wrapped (GST_MEMORY_FLAG_READONLY, |
| buf, rv, 0, rv, gsb, free_buffer)); |
| |
| return GST_FLOW_OK; |
| } |
| |
| static GstStateChangeReturn |
| gst_shm_src_change_state (GstElement * element, GstStateChange transition) |
| { |
| GstStateChangeReturn ret = GST_STATE_CHANGE_SUCCESS; |
| GstShmSrc *self = GST_SHM_SRC (element); |
| |
| switch (transition) { |
| case GST_STATE_CHANGE_PAUSED_TO_PLAYING: |
| if (gst_base_src_is_live (GST_BASE_SRC (element))) |
| if (!gst_shm_src_start_reading (self)) |
| return GST_STATE_CHANGE_FAILURE; |
| default: |
| break; |
| } |
| |
| ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition); |
| if (ret == GST_STATE_CHANGE_FAILURE) |
| return ret; |
| |
| switch (transition) { |
| case GST_STATE_CHANGE_PLAYING_TO_PAUSED: |
| if (gst_base_src_is_live (GST_BASE_SRC (element))) |
| gst_shm_src_stop_reading (self); |
| default: |
| break; |
| } |
| |
| return ret; |
| } |
| |
| static gboolean |
| gst_shm_src_unlock (GstBaseSrc * bsrc) |
| { |
| GstShmSrc *self = GST_SHM_SRC (bsrc); |
| |
| self->unlocked = TRUE; |
| gst_poll_set_flushing (self->poll, TRUE); |
| |
| return TRUE; |
| } |
| |
| static gboolean |
| gst_shm_src_unlock_stop (GstBaseSrc * bsrc) |
| { |
| GstShmSrc *self = GST_SHM_SRC (bsrc); |
| |
| self->unlocked = FALSE; |
| gst_poll_set_flushing (self->poll, FALSE); |
| |
| return TRUE; |
| } |
| |
| static void |
| gst_shm_pipe_inc (GstShmPipe * pipe) |
| { |
| g_return_if_fail (pipe); |
| g_return_if_fail (pipe->src); |
| g_return_if_fail (pipe->use_count > 0); |
| |
| GST_OBJECT_LOCK (pipe->src); |
| pipe->use_count++; |
| GST_OBJECT_UNLOCK (pipe->src); |
| } |
| |
| static void |
| gst_shm_pipe_dec (GstShmPipe * pipe) |
| { |
| g_return_if_fail (pipe); |
| g_return_if_fail (pipe->src); |
| g_return_if_fail (pipe->use_count > 0); |
| |
| GST_OBJECT_LOCK (pipe->src); |
| pipe->use_count--; |
| |
| if (pipe->use_count > 0) { |
| GST_OBJECT_UNLOCK (pipe->src); |
| return; |
| } |
| |
| if (pipe->pipe) |
| sp_close (pipe->pipe); |
| GST_OBJECT_UNLOCK (pipe->src); |
| |
| gst_object_unref (pipe->src); |
| g_slice_free (GstShmPipe, pipe); |
| } |