mirrors/gstreamer
mirrors/gstreamer
1
1
Fork 0
mirror of https://gitlab.freedesktop.org/gstreamer/gstreamer.git synced 2024-12-23 16:50:47 +00:00
Code Issues 1 Projects Releases Wiki Activity

shmsink: Port to ShmPipe

Browse source
This commit is contained in:
Olivier Crête 2009-10-30 18:24:58 +00:00
parent b6bc52f961
commit 67785f331a
3 changed files with 383 additions and 277 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

64
gst/shm/gstshm.h
View file

@ -1,64 +0,0 @@
/* 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.
*/
#ifndef __GST_SHM_H__
#define __GST_SHM_H__
#include <gst/gst.h>
#include <semaphore.h>
G_BEGIN_DECLS
#define GST_SHM_MAX_CAPS_LENGTH (1024)
#define SHM_LOCK(shm) sem_wait (&(shm)->mutex);
#define SHM_UNLOCK(shm) sem_post (&(shm)->mutex);
#define GST_SHM_CAPS_BUFFER(shm) ((shm)->data)
#define GST_SHM_BUFFER(shm) ((shm)->data+(shm)->caps_size)
struct GstShmHeader
{
sem_t notification;
sem_t mutex;
guint caps_gen;
guint buffer_gen;
gint caps_size;
gint buffer_size;
guint flags;
GstClockTime timestamp;
GstClockTime duration;
guint64 offset;
guint64 offset_end;
gboolean eos;
gchar data[0];
/*
* gchar caps_buffer[caps_size];
* gchar buffer[buffer_size];
*/
};
G_END_DECLS
#endif /* __GST_SHM_H__ */

574
gst/shm/gstshmsink.c
View file

@ -25,21 +25,16 @@
#endif
#include "gstshmsink.h"
#include "gstshm.h"
#include <gst/gst.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <errno.h>
#include <string.h>
#include <unistd.h>
#include <semaphore.h>
/* signals */
enum
{
SIGNAL_CLIENT_CONNECTED,
SIGNAL_CLIENT_DISCONNECTED,
LAST_SIGNAL
};
@ -47,12 +42,25 @@ enum
enum
{
PROP_0,
PROP_SHM_NAME,
PROP_PERMS
PROP_SOCKET_PATH,
PROP_PERMS,
PROP_SHM_SIZE,
PROP_WAIT_FOR_CONNECTION
};
struct GstShmClient
{
ShmClient *client;
GstPollFD pollfd;
};
#define DEFAULT_SIZE ( 256 * 1024 )
#define DEFAULT_WAIT_FOR_CONNECTION (TRUE)
#define DEFAULT_PERMS (S_IRWXU | S_IRWXG)
GST_DEBUG_CATEGORY_STATIC (shmsink_debug);
#define GST_CAT_DEFAULT shmsink_debug
static const GstElementDetails gst_shm_sink_details =
GST_ELEMENT_DETAILS ("Shared Memory Sink",
@ -67,21 +75,25 @@ static GstStaticPadTemplate sinktemplate = GST_STATIC_PAD_TEMPLATE ("sink",
GST_BOILERPLATE (GstShmSink, gst_shm_sink, GstBaseSink, GST_TYPE_BASE_SINK);
static void gst_shm_sink_finalize (GObject * object);
static void gst_shm_sink_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec);
static void gst_shm_sink_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec);
static GstStateChangeReturn gst_shm_sink_change_state (GstElement * element,
GstStateChange transition);
static gboolean gst_shm_sink_start (GstBaseSink * bsink);
static gboolean gst_shm_sink_stop (GstBaseSink * bsink);
static gboolean gst_shm_sink_set_caps (GstBaseSink * bsink, GstCaps * caps);
static GstFlowReturn gst_shm_sink_render (GstBaseSink * bsink, GstBuffer * buf);
static gboolean gst_shm_sink_event (GstBaseSink * bsink, GstEvent * event);
static GstFlowReturn gst_shm_sink_buffer_alloc (GstBaseSink * sink,
guint64 offset, guint size, GstCaps * caps, GstBuffer ** out_buf);
// static guint gst_shm_sink_signals[LAST_SIGNAL] = { 0 };
static gboolean gst_shm_sink_event (GstBaseSink * bsink, GstEvent * event);
static gboolean gst_shm_sink_unlock (GstBaseSink * bsink);
static gboolean gst_shm_sink_unlock_stop (GstBaseSink * bsink);
static gpointer pollthread_func (gpointer data);
static guint signals[LAST_SIGNAL] = { 0 };
static void
gst_shm_sink_base_init (gpointer g_class)
@ -98,8 +110,10 @@ gst_shm_sink_base_init (gpointer g_class)
static void
gst_shm_sink_init (GstShmSink * self, GstShmSinkClass * g_class)
{
self->fd = -1;
self->shm_area = MAP_FAILED;
self->cond = g_cond_new ();
self->size = DEFAULT_SIZE;
self->wait_for_connection = DEFAULT_WAIT_FOR_CONNECTION;
self->perms = DEFAULT_PERMS;
}
static void
@ -113,33 +127,64 @@ gst_shm_sink_class_init (GstShmSinkClass * klass)
gstelement_class = (GstElementClass *) klass;
gstbasesink_class = (GstBaseSinkClass *) klass;
gobject_class->finalize = gst_shm_sink_finalize;
gobject_class->set_property = gst_shm_sink_set_property;
gobject_class->get_property = gst_shm_sink_get_property;
gstelement_class->change_state = gst_shm_sink_change_state;
gstbasesink_class->start = GST_DEBUG_FUNCPTR (gst_shm_sink_start);
gstbasesink_class->stop = GST_DEBUG_FUNCPTR (gst_shm_sink_stop);
gstbasesink_class->render = GST_DEBUG_FUNCPTR (gst_shm_sink_render);
gstbasesink_class->event = GST_DEBUG_FUNCPTR (gst_shm_sink_event);
gstbasesink_class->unlock = GST_DEBUG_FUNCPTR (gst_shm_sink_unlock);
gstbasesink_class->unlock_stop = GST_DEBUG_FUNCPTR (gst_shm_sink_unlock_stop);
gstbasesink_class->buffer_alloc =
GST_DEBUG_FUNCPTR (gst_shm_sink_buffer_alloc);
gstbasesink_class->start = gst_shm_sink_start;
gstbasesink_class->stop = gst_shm_sink_stop;
gstbasesink_class->set_caps = gst_shm_sink_set_caps;
gstbasesink_class->render = gst_shm_sink_render;
gstbasesink_class->event = gst_shm_sink_event;
g_object_class_install_property (gobject_class, PROP_SHM_NAME,
g_param_spec_string ("shm-name",
"Name of the shared memory area",
"The name of the shared memory area that the source can read from",
NULL, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
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_PERMS,
g_param_spec_uint ("perms",
"Permissions on the shm area",
"Permissions to set on the shm area",
0, 07777, S_IRWXU | S_IRWXG,
G_PARAM_CONSTRUCT | G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
0, 07777, DEFAULT_PERMS, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_SHM_SIZE,
g_param_spec_uint ("shm-size",
"Size of the shm area",
"Size of the shared memory area",
0, G_MAXUINT, DEFAULT_SIZE,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
g_object_class_install_property (gobject_class, PROP_WAIT_FOR_CONNECTION,
g_param_spec_boolean ("wait-for-connection",
"Wait for a connection until rendering",
"Block the stream until the shm pipe is connected",
DEFAULT_WAIT_FOR_CONNECTION,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
signals[SIGNAL_CLIENT_CONNECTED] = g_signal_new ("client-connected",
GST_TYPE_SHM_SINK, G_SIGNAL_RUN_LAST, 0, NULL, NULL,
g_cclosure_marshal_VOID__INT, G_TYPE_NONE, 1, G_TYPE_INT);
signals[SIGNAL_CLIENT_DISCONNECTED] = g_signal_new ("client-disconnected",
GST_TYPE_SHM_SINK, G_SIGNAL_RUN_LAST, 0, NULL, NULL,
g_cclosure_marshal_VOID__INT, G_TYPE_NONE, 1, G_TYPE_INT);
GST_DEBUG_CATEGORY_INIT (shmsink_debug, "shmsink", 0, "Shared Memory Sink");
}
static void
gst_shm_sink_finalize (GObject * object)
{
GstShmSink *self = GST_SHM_SINK (object);
g_cond_free (self->cond);
}
/*
* Set the value of a property for the server sink.
*/
@ -150,19 +195,34 @@ gst_shm_sink_set_property (GObject * object, guint prop_id,
GstShmSink *self = GST_SHM_SINK (object);
switch (prop_id) {
case PROP_SHM_NAME:
case PROP_SOCKET_PATH:
GST_OBJECT_LOCK (object);
g_free (self->shm_name);
self->shm_name = g_value_dup_string (value);
g_free (self->socket_path);
self->socket_path = g_value_dup_string (value);
GST_OBJECT_UNLOCK (object);
break;
case PROP_PERMS:
GST_OBJECT_LOCK (object);
self->perms = g_value_get_uint (value);
if (self->fd >= 0)
if (fchmod (self->fd, g_value_get_uint (value)))
GST_WARNING_OBJECT (self,
"Could not set permissions %o on shm area: %s",
g_value_get_uint (value), strerror (errno));
sp_writer_setperms_shm (self->pipe, self->perms);
GST_OBJECT_UNLOCK (object);
break;
case PROP_SHM_SIZE:
GST_OBJECT_LOCK (object);
if (sp_writer_resize (self->pipe, g_value_get_uint (value)) < 0)
GST_DEBUG_OBJECT (self,
"Resize shared memory area from %u to %u bytes");
else
GST_WARNING_OBJECT (self,
"Could not resize shared memory area from %u to %u bytes");
self->size = g_value_get_uint (value);
GST_OBJECT_UNLOCK (object);
break;
case PROP_WAIT_FOR_CONNECTION:
GST_OBJECT_LOCK (object);
self->wait_for_connection = g_value_get_boolean (value);
GST_OBJECT_UNLOCK (object);
g_cond_broadcast (self->cond);
break;
default:
break;
@ -175,22 +235,29 @@ gst_shm_sink_get_property (GObject * object, guint prop_id,
{
GstShmSink *self = GST_SHM_SINK (object);
GST_OBJECT_LOCK (object);
switch (prop_id) {
case PROP_SHM_NAME:
GST_OBJECT_LOCK (object);
g_value_set_string (value, self->shm_name);
GST_OBJECT_UNLOCK (object);
case PROP_SOCKET_PATH:
g_value_set_string (value, self->socket_path);
break;
case PROP_PERMS:
self->perms = g_value_get_uint (value);
if (self->fd >= 0)
fchmod (self->fd, g_value_get_uint (value));
if (self->pipe)
sp_writer_setperms_shm (self->pipe, self->perms);
break;
case PROP_SHM_SIZE:
g_value_set_uint (value, self->size);
break;
case PROP_WAIT_FOR_CONNECTION:
g_value_set_boolean (value, self->wait_for_connection);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
GST_OBJECT_UNLOCK (object);
}
@ -199,62 +266,44 @@ static gboolean
gst_shm_sink_start (GstBaseSink * bsink)
{
GstShmSink *self = GST_SHM_SINK (bsink);
g_return_val_if_fail (self->fd == -1, FALSE);
GST_OBJECT_LOCK (self);
if (!self->shm_name) {
GST_OBJECT_UNLOCK (self);
GST_ERROR_OBJECT (self, "Must set the name of the shm area first");
self->stop = FALSE;
if (!self->socket_path) {
GST_ELEMENT_ERROR (self, RESOURCE, OPEN_READ_WRITE,
("One must specify the name of the shm area"),
("shm-name property not set"));
("Could not open socket."), (NULL));
return FALSE;
}
self->fd = shm_open (self->shm_name, O_RDWR | O_CREAT | O_TRUNC, self->perms);
self->pipe = sp_writer_create (self->socket_path, self->size, self->perms);
if (self->fd < 0) {
GST_OBJECT_UNLOCK (self);
GST_ERROR_OBJECT (self, "Could not open shm area: %s", strerror (errno));
if (!self->pipe) {
GST_ELEMENT_ERROR (self, RESOURCE, OPEN_READ_WRITE,
("Could not open the shm area"),
("shm_open failed (%d): %s", errno, strerror (errno)));
return FALSE;
}
self->opened_name = g_strdup (self->shm_name);
GST_OBJECT_UNLOCK (self);
self->shm_area_len = sizeof (struct GstShmHeader);
if (ftruncate (self->fd, self->shm_area_len)) {
GST_ERROR_OBJECT (self,
"Could not make shm area large enough for header: %s",
strerror (errno));
gst_shm_sink_stop (bsink);
GST_ELEMENT_ERROR (self, RESOURCE, OPEN_READ_WRITE,
("Could not resize memory area"),
("ftruncate failed (%d): %s", errno, strerror (errno)));
("Could not open socket."), (NULL));
return FALSE;
}
self->shm_area = mmap (NULL, self->shm_area_len, PROT_READ | PROT_WRITE,
MAP_SHARED, self->fd, 0);
self->poll = gst_poll_new (TRUE);
gst_poll_fd_init (&self->serverpollfd);
self->serverpollfd.fd = sp_get_fd (self->pipe);
gst_poll_add_fd (self->poll, &self->serverpollfd);
gst_poll_fd_ctl_read (self->poll, &self->serverpollfd, TRUE);
if (self->shm_area == MAP_FAILED) {
GST_ERROR_OBJECT (self, "Could not map shm area");
GST_ELEMENT_ERROR (self, RESOURCE, OPEN_READ_WRITE,
("Could not map memory area"),
("mmap failed (%d): %s", errno, strerror (errno)));
gst_shm_sink_stop (bsink);
return FALSE;
}
self->pollthread = g_thread_create (pollthread_func, self, TRUE, NULL);
memset (self->shm_area, 0, self->shm_area_len);
g_assert (sem_init (&self->shm_area->notification, 1, 0) == 0);
g_assert (sem_init (&self->shm_area->mutex, 1, 1) == 0);
if (!self->pollthread)
goto thread_error;
return TRUE;
thread_error:
sp_close (self->pipe);
self->pipe = NULL;
gst_poll_free (self->poll);
GST_ELEMENT_ERROR (self, CORE, THREAD, ("Could not srart thread"), (NULL));
return FALSE;
}
@ -263,70 +312,28 @@ gst_shm_sink_stop (GstBaseSink * bsink)
{
GstShmSink *self = GST_SHM_SINK (bsink);
if (self->fd >= 0)
close (self->fd);
self->fd = -1;
self->stop = TRUE;
gst_poll_set_flushing (self->poll, TRUE);
if (self->opened_name) {
shm_unlink (self->opened_name);
g_free (self->opened_name);
self->opened_name = NULL;
g_thread_join (self->pollthread);
self->pollthread = NULL;
GST_DEBUG_OBJECT (self, "Stopping");
while (self->clients) {
struct GstShmClient *client = self->clients->data;
self->clients = g_list_remove (self->clients, client);
sp_writer_close_client (self->pipe, client->client);
g_signal_emit (self, signals[SIGNAL_CLIENT_DISCONNECTED], 0,
client->pollfd.fd);
g_slice_free (struct GstShmClient, client);
}
if (self->shm_area != MAP_FAILED)
munmap (self->shm_area, self->shm_area_len);
self->shm_area_len = 0;
self->shm_area = MAP_FAILED;
gst_poll_free (self->poll);
self->poll = NULL;
return TRUE;
}
static gboolean
gst_shm_sink_set_caps (GstBaseSink * bsink, GstCaps * caps)
{
GstShmSink *self = GST_SHM_SINK (bsink);
self->caps_gen++;
return TRUE;
}
static gboolean
resize_area (GstShmSink * self, size_t desired_length)
{
if (desired_length <= self->shm_area_len)
return TRUE;
SHM_UNLOCK (self->shm_area);
if (munmap (self->shm_area, self->shm_area_len)) {
GST_ERROR_OBJECT (self, "Could not unmap shared area");
GST_ELEMENT_ERROR (self, RESOURCE, OPEN_READ_WRITE,
("Could not unmap memory area"),
("munmap failed (%d): %s", errno, strerror (errno)));
return FALSE;
}
if (ftruncate (self->fd, desired_length)) {
GST_ERROR_OBJECT (self, "Could not resize shared area");
GST_ELEMENT_ERROR (self, RESOURCE, OPEN_READ_WRITE,
("Could not resize memory area"),
("ftruncate failed (%d): %s", errno, strerror (errno)));
return FALSE;
}
self->shm_area = mmap (NULL, desired_length, PROT_READ | PROT_WRITE,
MAP_SHARED, self->fd, 0);
self->shm_area_len = desired_length;
if (self->shm_area == MAP_FAILED) {
self->shm_area = NULL;
GST_ERROR_OBJECT (self, "Could not remap shared area");
GST_ELEMENT_ERROR (self, RESOURCE, OPEN_READ_WRITE,
("Could not map memory area"),
("mmap failed (%d): %s", errno, strerror (errno)));
return FALSE;
}
SHM_LOCK (self->shm_area);
sp_close (self->pipe);
self->pipe = NULL;
return TRUE;
}
@ -335,86 +342,239 @@ static GstFlowReturn
gst_shm_sink_render (GstBaseSink * bsink, GstBuffer * buf)
{
GstShmSink *self = GST_SHM_SINK (bsink);
int rv;
g_return_val_if_fail (self->shm_area != MAP_FAILED, GST_FLOW_ERROR);
SHM_LOCK (self->shm_area);
if (self->caps_gen != self->shm_area->caps_gen) {
gchar *caps_str =
gst_caps_to_string (GST_PAD_CAPS (GST_BASE_SINK_PAD (bsink)));
guint caps_size = strlen (caps_str) + 1;
if (!resize_area (self, sizeof (struct GstShmHeader) +
caps_size + GST_BUFFER_SIZE (buf))) {
g_free (caps_str);
return GST_FLOW_ERROR;
GST_OBJECT_LOCK (self);
while (self->wait_for_connection && !self->clients) {
g_cond_wait (self->cond, GST_OBJECT_GET_LOCK (self));
if (self->unlock) {
GST_OBJECT_UNLOCK (self);
return GST_FLOW_WRONG_STATE;
}
self->shm_area->caps_size = caps_size;
memcpy (GST_SHM_CAPS_BUFFER (self->shm_area), caps_str, caps_size);
g_free (caps_str);
self->shm_area->caps_gen = self->caps_gen;
} else {
if (!resize_area (self, sizeof (struct GstShmHeader) +
self->shm_area->caps_size + GST_BUFFER_SIZE (buf)))
return GST_FLOW_ERROR;
}
memcpy (GST_SHM_BUFFER (self->shm_area), GST_BUFFER_DATA (buf),
rv = sp_writer_send_buf (self->pipe, (char *) GST_BUFFER_DATA (buf),
GST_BUFFER_SIZE (buf));
self->shm_area->buffer_size = GST_BUFFER_SIZE (buf);
self->shm_area->buffer_gen++;
if (rv == -1) {
ShmBlock *block = NULL;
gchar *shmbuf = NULL;
while ((block = sp_writer_alloc_block (self->pipe,
GST_BUFFER_SIZE (buf))) == NULL) {
g_cond_wait (self->cond, GST_OBJECT_GET_LOCK (self));
if (self->unlock) {
GST_OBJECT_UNLOCK (self);
return GST_FLOW_WRONG_STATE;
}
}
while (self->wait_for_connection && !self->clients) {
g_cond_wait (self->cond, GST_OBJECT_GET_LOCK (self));
if (self->unlock) {
sp_writer_free_block (block);
GST_OBJECT_UNLOCK (self);
return GST_FLOW_WRONG_STATE;
}
}
self->shm_area->timestamp = GST_BUFFER_TIMESTAMP (buf);
self->shm_area->duration = GST_BUFFER_DURATION (buf);
self->shm_area->offset = GST_BUFFER_OFFSET (buf);
self->shm_area->offset_end = GST_BUFFER_OFFSET_END (buf);
self->shm_area->flags = GST_BUFFER_FLAGS (buf) & (GST_BUFFER_FLAG_DISCONT |
GST_BUFFER_FLAG_GAP | GST_BUFFER_FLAG_DELTA_UNIT);
sem_post (&self->shm_area->notification);
shmbuf = sp_writer_block_get_buf (block);
memcpy (shmbuf, GST_BUFFER_DATA (buf), GST_BUFFER_SIZE (buf));
sp_writer_send_buf (self->pipe, shmbuf, GST_BUFFER_SIZE (buf));
sp_writer_free_block (block);
}
SHM_UNLOCK (self->shm_area);
GST_OBJECT_UNLOCK (self);
return GST_FLOW_OK;
}
void
gst_shm_sink_free_buffer (gpointer data)
{
ShmBlock *block = data;
sp_writer_free_block (block);
}
static GstFlowReturn
gst_shm_sink_buffer_alloc (GstBaseSink * sink, guint64 offset, guint size,
GstCaps * caps, GstBuffer ** out_buf)
{
GstShmSink *self = GST_SHM_SINK (sink);
GstBuffer *buffer;
ShmBlock *block = NULL;
gpointer buf = NULL;
GST_OBJECT_LOCK (self);
block = sp_writer_alloc_block (self->pipe, size);
if (block)
buf = sp_writer_block_get_buf (block);
GST_OBJECT_UNLOCK (self);
if (block) {
buffer = gst_buffer_new ();
GST_BUFFER_DATA (buffer) = buf;
GST_BUFFER_MALLOCDATA (buffer) = (guint8 *) block;
GST_BUFFER_FREE_FUNC (buffer) =
GST_DEBUG_FUNCPTR (gst_shm_sink_free_buffer);
GST_BUFFER_SIZE (buffer) = size;
GST_LOG_OBJECT (self,
"Allocated buffer of %lu bytes from shared memory at %p", size, buf);
} else {
buffer = gst_buffer_new_and_alloc (size);
GST_LOG_OBJECT (self, "Not enough shared memory for buffer of %lu bytes, "
"allocating using standard allocator", size);
}
GST_BUFFER_OFFSET (buffer) = offset;
gst_buffer_set_caps (buffer, caps);
*out_buf = buffer;
return GST_FLOW_OK;
}
static gpointer
pollthread_func (gpointer data)
{
GstShmSink *self = GST_SHM_SINK (data);
GList *item;
while (!self->stop) {
if (gst_poll_wait (self->poll, GST_CLOCK_TIME_NONE) < 0)
return NULL;
if (self->stop)
return NULL;
if (gst_poll_fd_has_closed (self->poll, &self->serverpollfd)) {
GST_ELEMENT_ERROR (self, RESOURCE, READ, ("Failed read from shmsink"),
("Control socket has closed"));
return NULL;
}
if (gst_poll_fd_has_error (self->poll, &self->serverpollfd)) {
GST_ELEMENT_ERROR (self, RESOURCE, READ, ("Failed to read from shmsink"),
("Control socket has error"));
return NULL;
}
if (gst_poll_fd_can_read (self->poll, &self->serverpollfd)) {
ShmClient *client;
struct GstShmClient *gclient;
GST_OBJECT_LOCK (self);
client = sp_writer_accept_client (self->pipe);
GST_OBJECT_UNLOCK (self);
if (!client) {
GST_ELEMENT_ERROR (self, RESOURCE, READ,
("Failed to read from shmsink"),
("Control socket returns wrong data"));
return NULL;
}
gclient = g_slice_new (struct GstShmClient);
gclient->client = client;
gst_poll_fd_init (&gclient->pollfd);
gclient->pollfd.fd = sp_writer_get_client_fd (client);
gst_poll_add_fd (self->poll, &gclient->pollfd);
gst_poll_fd_ctl_read (self->poll, &gclient->pollfd, TRUE);
self->clients = g_list_prepend (self->clients, gclient);
g_signal_emit (self, signals[SIGNAL_CLIENT_CONNECTED], 0,
gclient->pollfd.fd);
}
again:
for (item = self->clients; item; item = item->next) {
struct GstShmClient *gclient = item->data;
if (gst_poll_fd_has_closed (self->poll, &gclient->pollfd)) {
GST_WARNING_OBJECT (self, "One client is gone, closing");
goto close_client;
}
if (gst_poll_fd_has_error (self->poll, &gclient->pollfd)) {
GST_WARNING_OBJECT (self, "One client fd has error, closing");
goto close_client;
}
if (gst_poll_fd_can_read (self->poll, &gclient->pollfd)) {
int rv;
GST_OBJECT_LOCK (self);
rv = sp_writer_recv (self->pipe, gclient->client);
GST_OBJECT_UNLOCK (self);
if (rv < 0) {
GST_WARNING_OBJECT (self, "One client has read error,"
" closing (retval: %d errno: %d)", rv, errno);
goto close_client;
}
}
continue;
close_client:
GST_OBJECT_LOCK (self);
sp_writer_close_client (self->pipe, gclient->client);
GST_OBJECT_UNLOCK (self);
gst_poll_remove_fd (self->poll, &gclient->pollfd);
self->clients = g_list_remove (self->clients, gclient);
g_signal_emit (self, signals[SIGNAL_CLIENT_DISCONNECTED], 0,
gclient->pollfd.fd);
g_slice_free (struct GstShmClient, gclient);
goto again;
}
g_cond_broadcast (self->cond);
}
return NULL;
}
static gboolean
gst_shm_sink_event (GstBaseSink * bsink, GstEvent * event)
{
GstShmSink *self = GST_SHM_SINK (bsink);
g_return_val_if_fail (self->shm_area != MAP_FAILED, FALSE);
if (GST_EVENT_TYPE (event) == GST_EVENT_EOS) {
SHM_LOCK (self->shm_area);
self->shm_area->eos = TRUE;
SHM_UNLOCK (self->shm_area);
}
return TRUE;
}
static GstStateChangeReturn
gst_shm_sink_change_state (GstElement * element, GstStateChange transition)
{
GstShmSink *self = GST_SHM_SINK (element);
switch (transition) {
case GST_STATE_CHANGE_READY_TO_PAUSED:
g_return_val_if_fail (self->shm_area != MAP_FAILED,
GST_STATE_CHANGE_FAILURE);
SHM_LOCK (self->shm_area);
self->shm_area->eos = FALSE;
SHM_UNLOCK (self->shm_area);
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_EOS:
GST_OBJECT_LOCK (self);
while (sp_writer_pending_writes (self->pipe) && !self->unlock)
g_cond_wait (self->cond, GST_OBJECT_GET_LOCK (self));
GST_OBJECT_UNLOCK (self);
break;
default:
break;
}
return GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
return TRUE;
}
static gboolean
gst_shm_sink_unlock (GstBaseSink * bsink)
{
GstShmSink *self = GST_SHM_SINK (bsink);
GST_OBJECT_LOCK (self);
self->unlock = TRUE;
GST_OBJECT_UNLOCK (self);
g_cond_broadcast (self->cond);
return TRUE;
}
static gboolean
gst_shm_sink_unlock_stop (GstBaseSink * bsink)
{
GstShmSink *self = GST_SHM_SINK (bsink);
GST_OBJECT_LOCK (self);
self->unlock = FALSE;
GST_OBJECT_UNLOCK (self);
return TRUE;
}

22
gst/shm/gstshmsink.h
View file

@ -25,6 +25,8 @@
#include <gst/gst.h>
#include <gst/base/gstbasesink.h>
#include "shmpipe.h"
G_BEGIN_DECLS
#define GST_TYPE_SHM_SINK \
(gst_shm_sink_get_type())
@ -43,16 +45,24 @@ struct _GstShmSink
{
GstBaseSink element;
gchar *shm_name;
gchar *socket_path;
int fd;
struct GstShmHeader *shm_area;
size_t shm_area_len;
gchar *opened_name;
ShmPipe *pipe;
guint perms;
guint size;
guint caps_gen;
GList *clients;
GThread *pollthread;
GstPoll *poll;
GstPollFD serverpollfd;
gboolean wait_for_connection;
gboolean stop;
gboolean unlock;
GCond *cond;
};
struct _GstShmSinkClass