gstreamer/subprojects/gst-plugins-bad/sys/shm/gstshmsrc.c

480 lines
12 KiB
C

/* 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., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
/**
* SECTION:element-shmsrc
* @title: shmsrc
*
* Receive data from the shared memory sink.
*
* ## Example launch lines
* |[
* gst-launch-1.0 shmsrc socket-path=/tmp/blah ! \
* "video/x-raw, format=YUY2, color-matrix=sdtv, \
* chroma-site=mpeg2, width=(int)320, height=(int)240, framerate=(fraction)30/1" \
* ! queue ! videoconvert ! autovideosink
* ]| Render video from shm buffers.
*
*/
#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,
PROP_SHM_AREA_NAME
};
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);
GST_ELEMENT_REGISTER_DEFINE (shmsrc, "shmsrc", GST_RANK_NONE, GST_TYPE_SHM_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_dec (GstShmPipe * pipe);
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",
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));
g_object_class_install_property (gobject_class, PROP_SHM_AREA_NAME,
g_param_spec_string ("shm-area-name",
"Name of the shared memory area",
"The name of the shared memory area used to get buffers",
NULL, G_PARAM_READABLE | G_PARAM_STATIC_STRINGS));
gst_element_class_add_static_pad_template (gstelement_class, &srctemplate);
gst_element_class_set_static_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_free (self->socket_path);
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;
case PROP_SHM_AREA_NAME:
GST_OBJECT_LOCK (object);
if (self->pipe)
g_value_set_string (value, sp_get_shm_area_name (self->pipe->pipe));
GST_OBJECT_UNLOCK (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;
if (!self->socket_path) {
GST_ELEMENT_ERROR (self, RESOURCE, NOT_FOUND,
("No path specified for socket."), (NULL));
return FALSE;
}
gstpipe = g_slice_new0 (GstShmPipe);
gstpipe->use_count = 1;
gstpipe->src = gst_object_ref (self);
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;
self->unlocked = FALSE;
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)
{
GstShmPipe *pipe;
GST_DEBUG_OBJECT (self, "Stopping %p", self);
GST_OBJECT_LOCK (self);
pipe = self->pipe;
self->pipe = NULL;
GST_OBJECT_UNLOCK (self);
if (pipe) {
gst_shm_pipe_dec (pipe);
}
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);
GstShmPipe *pipe;
gchar *buf = NULL;
int rv = 0;
struct GstShmBuffer *gsb;
GST_DEBUG_OBJECT (self, "Stopping %p", self);
GST_OBJECT_LOCK (self);
pipe = self->pipe;
if (!pipe) {
GST_OBJECT_UNLOCK (self);
return GST_FLOW_FLUSHING;
} else {
pipe->use_count++;
}
GST_OBJECT_UNLOCK (self);
do {
if (gst_poll_wait (self->poll, GST_CLOCK_TIME_NONE) < 0) {
if (errno == EBUSY)
goto flushing;
GST_ELEMENT_ERROR (self, RESOURCE, READ, ("Failed to read from shmsrc"),
("Poll failed on fd: %s", strerror (errno)));
goto error;
}
if (self->unlocked)
goto 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"));
goto 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"));
goto 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 (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));
goto 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 = pipe;
*outbuf = gst_buffer_new_wrapped_full (GST_MEMORY_FLAG_READONLY,
buf, rv, 0, rv, gsb, free_buffer);
return GST_FLOW_OK;
error:
gst_shm_pipe_dec (pipe);
return GST_FLOW_ERROR;
flushing:
gst_shm_pipe_dec (pipe);
return GST_FLOW_FLUSHING;
}
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_unlock (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_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_client_close (pipe->pipe);
gst_poll_remove_fd (pipe->src->poll, &pipe->src->pollfd);
gst_poll_fd_init (&pipe->src->pollfd);
GST_OBJECT_UNLOCK (pipe->src);
gst_object_unref (pipe->src);
g_slice_free (GstShmPipe, pipe);
}