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gstreamer/sys/shm/gstshmsink.c

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/* 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-shmsink
* @title: shmsink
*
* Send data over shared memory to the matching source.
*
* ## Example launch lines
* |[
* gst-launch-1.0 -v videotestsrc ! "video/x-raw, format=YUY2, color-matrix=sdtv, \
* chroma-site=mpeg2, width=(int)320, height=(int)240, framerate=(fraction)30/1" \
* ! shmsink socket-path=/tmp/blah shm-size=2000000
* ]| Send video to shm buffers.
*
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "gstshmsink.h"
#include <gst/gst.h>
#include <string.h>
/* signals */
enum
{
SIGNAL_CLIENT_CONNECTED,
SIGNAL_CLIENT_DISCONNECTED,
LAST_SIGNAL
};
/* properties */
enum
{
PROP_0,
PROP_SOCKET_PATH,
PROP_PERMS,
PROP_SHM_SIZE,
PROP_WAIT_FOR_CONNECTION,
PROP_BUFFER_TIME
};
struct GstShmClient
{
ShmClient *client;
GstPollFD pollfd;
};
#define DEFAULT_SIZE ( 64 * 1024 * 1024 )
#define DEFAULT_WAIT_FOR_CONNECTION (TRUE)
/* Default is user read/write, group read */
#define DEFAULT_PERMS ( S_IRUSR | S_IWUSR | S_IRGRP )
GST_DEBUG_CATEGORY_STATIC (shmsink_debug);
#define GST_CAT_DEFAULT shmsink_debug
static GstStaticPadTemplate sinktemplate = GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS_ANY);
#define gst_shm_sink_parent_class parent_class
G_DEFINE_TYPE (GstShmSink, gst_shm_sink, 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 gboolean gst_shm_sink_start (GstBaseSink * bsink);
static gboolean gst_shm_sink_stop (GstBaseSink * bsink);
static GstFlowReturn gst_shm_sink_render (GstBaseSink * bsink, GstBuffer * buf);
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 gboolean gst_shm_sink_propose_allocation (GstBaseSink * sink,
GstQuery * query);
static gpointer pollthread_func (gpointer data);
static guint signals[LAST_SIGNAL] = { 0 };
/********************
* CUSTOM ALLOCATOR *
********************/
#define GST_TYPE_SHM_SINK_ALLOCATOR \
(gst_shm_sink_allocator_get_type())
#define GST_SHM_SINK_ALLOCATOR(obj) \
(G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_SHM_SINK_ALLOCATOR, \
GstShmSinkAllocator))
#define GST_SHM_SINK_ALLOCATOR_CLASS(klass) \
(G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_SHM_SINK_ALLOCATOR, \
GstShmSinkAllocatorClass))
#define GST_IS_SHM_SINK_ALLOCATOR(obj) \
(G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_SHM_SINK_ALLOCATOR))
#define GST_IS_SHM_SINK_ALLOCATOR_CLASS(klass) \
(G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_SHM_SINK_ALLOCATOR))
struct _GstShmSinkAllocator
{
GstAllocator parent;
GstShmSink *sink;
};
typedef struct _GstShmSinkAllocatorClass
{
GstAllocatorClass parent;
} GstShmSinkAllocatorClass;
typedef struct _GstShmSinkMemory
{
GstMemory mem;
gchar *data;
GstShmSink *sink;
ShmBlock *block;
} GstShmSinkMemory;
GType gst_shm_sink_allocator_get_type (void);
G_DEFINE_TYPE (GstShmSinkAllocator, gst_shm_sink_allocator, GST_TYPE_ALLOCATOR);
static void
gst_shm_sink_allocator_dispose (GObject * object)
{
GstShmSinkAllocator *self = GST_SHM_SINK_ALLOCATOR (object);
if (self->sink)
gst_object_unref (self->sink);
self->sink = NULL;
G_OBJECT_CLASS (gst_shm_sink_allocator_parent_class)->dispose (object);
}
static void
gst_shm_sink_allocator_free (GstAllocator * allocator, GstMemory * mem)
{
GstShmSinkMemory *mymem = (GstShmSinkMemory *) mem;
if (mymem->block) {
GST_OBJECT_LOCK (mymem->sink);
sp_writer_free_block (mymem->block);
GST_OBJECT_UNLOCK (mymem->sink);
gst_object_unref (mymem->sink);
}
gst_object_unref (mem->allocator);
g_slice_free (GstShmSinkMemory, mymem);
}
static gpointer
gst_shm_sink_allocator_mem_map (GstMemory * mem, gsize maxsize,
GstMapFlags flags)
{
GstShmSinkMemory *mymem = (GstShmSinkMemory *) mem;
return mymem->data;
}
static void
gst_shm_sink_allocator_mem_unmap (GstMemory * mem)
{
}
static GstMemory *
gst_shm_sink_allocator_mem_share (GstMemory * mem, gssize offset, gssize size)
{
GstShmSinkMemory *mymem = (GstShmSinkMemory *) mem;
GstShmSinkMemory *mysub;
GstMemory *parent;
/* find the real parent */
if ((parent = mem->parent) == NULL)
parent = mem;
if (size == -1)
size = mem->size - offset;
mysub = g_slice_new0 (GstShmSinkMemory);
/* the shared memory is always readonly */
gst_memory_init (GST_MEMORY_CAST (mysub), GST_MINI_OBJECT_FLAGS (parent) |
GST_MINI_OBJECT_FLAG_LOCK_READONLY, gst_object_ref (mem->allocator),
parent, mem->maxsize, mem->align, mem->offset + offset, size);
mysub->data = mymem->data;
return (GstMemory *) mysub;
}
static gboolean
gst_shm_sink_allocator_mem_is_span (GstMemory * mem1, GstMemory * mem2,
gsize * offset)
{
GstShmSinkMemory *mymem1 = (GstShmSinkMemory *) mem1;
GstShmSinkMemory *mymem2 = (GstShmSinkMemory *) mem2;
if (offset) {
GstMemory *parent;
parent = mem1->parent;
*offset = mem1->offset - parent->offset;
}
/* and memory is contiguous */
return mymem1->data + mem1->offset + mem1->size ==
mymem2->data + mem2->offset;
}
static void
gst_shm_sink_allocator_init (GstShmSinkAllocator * self)
{
GstAllocator *allocator = GST_ALLOCATOR (self);
allocator->mem_map = gst_shm_sink_allocator_mem_map;
allocator->mem_unmap = gst_shm_sink_allocator_mem_unmap;
allocator->mem_share = gst_shm_sink_allocator_mem_share;
allocator->mem_is_span = gst_shm_sink_allocator_mem_is_span;
}
static GstMemory *
gst_shm_sink_allocator_alloc_locked (GstShmSinkAllocator * self, gsize size,
GstAllocationParams * params)
{
GstMemory *memory = NULL;
ShmBlock *block = NULL;
gsize maxsize = size + params->prefix + params->padding;
gsize align = params->align;
/* ensure configured alignment */
align |= gst_memory_alignment;
/* allocate more to compensate for alignment */
maxsize += align;
block = sp_writer_alloc_block (self->sink->pipe, maxsize);
if (block) {
GstShmSinkMemory *mymem;
gsize aoffset, padding;
GST_LOG_OBJECT (self,
"Allocated block %p with %" G_GSIZE_FORMAT " bytes at %p", block, size,
sp_writer_block_get_buf (block));
mymem = g_slice_new0 (GstShmSinkMemory);
memory = GST_MEMORY_CAST (mymem);
mymem->data = sp_writer_block_get_buf (block);
mymem->sink = gst_object_ref (self->sink);
mymem->block = block;
/* do alignment */
if ((aoffset = ((guintptr) mymem->data & align))) {
aoffset = (align + 1) - aoffset;
mymem->data += aoffset;
maxsize -= aoffset;
}
if (params->prefix && (params->flags & GST_MEMORY_FLAG_ZERO_PREFIXED))
memset (mymem->data, 0, params->prefix);
padding = maxsize - (params->prefix + size);
if (padding && (params->flags & GST_MEMORY_FLAG_ZERO_PADDED))
memset (mymem->data + params->prefix + size, 0, padding);
gst_memory_init (memory, params->flags,
GST_ALLOCATOR_CAST (g_object_ref (self)), NULL, maxsize, align,
params->prefix, size);
}
return memory;
}
static GstMemory *
gst_shm_sink_allocator_alloc (GstAllocator * allocator, gsize size,
GstAllocationParams * params)
{
GstShmSinkAllocator *self = GST_SHM_SINK_ALLOCATOR (allocator);
GstMemory *memory = NULL;
GST_OBJECT_LOCK (self->sink);
memory = gst_shm_sink_allocator_alloc_locked (self, size, params);
GST_OBJECT_UNLOCK (self->sink);
if (!memory) {
memory = gst_allocator_alloc (NULL, size, params);
GST_LOG_OBJECT (self,
"Not enough shared memory for GstMemory of %" G_GSIZE_FORMAT
"bytes, allocating using standard allocator", size);
}
return memory;
}
static void
gst_shm_sink_allocator_class_init (GstShmSinkAllocatorClass * klass)
{
GstAllocatorClass *allocator_class = GST_ALLOCATOR_CLASS (klass);
GObjectClass *object_class = G_OBJECT_CLASS (klass);
allocator_class->alloc = gst_shm_sink_allocator_alloc;
allocator_class->free = gst_shm_sink_allocator_free;
object_class->dispose = gst_shm_sink_allocator_dispose;
}
static GstShmSinkAllocator *
gst_shm_sink_allocator_new (GstShmSink * sink)
{
GstShmSinkAllocator *self = g_object_new (GST_TYPE_SHM_SINK_ALLOCATOR, NULL);
gst_object_ref_sink (self);
self->sink = gst_object_ref (sink);
return self;
}
/***************
* MAIN OBJECT *
***************/
static void
gst_shm_sink_init (GstShmSink * self)
{
g_cond_init (&self->cond);
self->size = DEFAULT_SIZE;
self->unlock = FALSE;
self->wait_for_connection = DEFAULT_WAIT_FOR_CONNECTION;
self->perms = DEFAULT_PERMS;
gst_allocation_params_init (&self->params);
}
static void
gst_shm_sink_class_init (GstShmSinkClass * klass)
{
GObjectClass *gobject_class;
GstElementClass *gstelement_class;
GstBaseSinkClass *gstbasesink_class;
gobject_class = (GObjectClass *) 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;
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->propose_allocation =
GST_DEBUG_FUNCPTR (gst_shm_sink_propose_allocation);
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. This may be modified during the NULL->READY transition",
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, 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));
g_object_class_install_property (gobject_class, PROP_BUFFER_TIME,
g_param_spec_int64 ("buffer-time",
"Buffer Time of the shm buffer",
"Maximum Size of the shm buffer in nanoseconds (-1 to disable)",
-1, G_MAXINT64, -1,
G_PARAM_CONSTRUCT | 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_element_class_add_static_pad_template (gstelement_class, &sinktemplate);
gst_element_class_set_static_metadata (gstelement_class,
"Shared Memory Sink",
"Sink",
"Send data over shared memory to the matching source",
"Olivier Crete <olivier.crete@collabora.co.uk>");
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_clear (&self->cond);
g_free (self->socket_path);
G_OBJECT_CLASS (parent_class)->finalize (object);
}
/*
* Set the value of a property for the server sink.
*/
static void
gst_shm_sink_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
GstShmSink *self = GST_SHM_SINK (object);
int ret = 0;
switch (prop_id) {
case PROP_SOCKET_PATH:
GST_OBJECT_LOCK (object);
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->pipe)
ret = sp_writer_setperms_shm (self->pipe, self->perms);
GST_OBJECT_UNLOCK (object);
if (ret < 0)
GST_WARNING_OBJECT (object, "Could not set permissions on pipe: %s",
strerror (ret));
break;
case PROP_SHM_SIZE:
GST_OBJECT_LOCK (object);
if (self->pipe) {
if (sp_writer_resize (self->pipe, g_value_get_uint (value)) < 0) {
/* Swap allocators, so we can know immediately if the memory is
* ours */
gst_object_unref (self->allocator);
self->allocator = gst_shm_sink_allocator_new (self);
GST_DEBUG_OBJECT (self, "Resized shared memory area from %u to "
"%u bytes", self->size, g_value_get_uint (value));
} else {
GST_WARNING_OBJECT (self, "Could not resize shared memory area from"
"%u to %u bytes", self->size, g_value_get_uint (value));
}
}
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;
case PROP_BUFFER_TIME:
GST_OBJECT_LOCK (object);
self->buffer_time = g_value_get_int64 (value);
GST_OBJECT_UNLOCK (object);
g_cond_broadcast (&self->cond);
break;
default:
break;
}
}
static void
gst_shm_sink_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec)
{
GstShmSink *self = GST_SHM_SINK (object);
GST_OBJECT_LOCK (object);
switch (prop_id) {
case PROP_SOCKET_PATH:
g_value_set_string (value, self->socket_path);
break;
case PROP_PERMS:
g_value_set_uint (value, 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;
case PROP_BUFFER_TIME:
g_value_set_int64 (value, self->buffer_time);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
GST_OBJECT_UNLOCK (object);
}
static gboolean
gst_shm_sink_start (GstBaseSink * bsink)
{
GstShmSink *self = GST_SHM_SINK (bsink);
GError *err = NULL;
self->stop = FALSE;
if (!self->socket_path) {
GST_ELEMENT_ERROR (self, RESOURCE, OPEN_READ_WRITE,
("Could not open socket."), (NULL));
return FALSE;
}
GST_DEBUG_OBJECT (self, "Creating new socket at %s"
" with shared memory of %d bytes", self->socket_path, self->size);
self->pipe = sp_writer_create (self->socket_path, self->size, self->perms);
if (!self->pipe) {
GST_ELEMENT_ERROR (self, RESOURCE, OPEN_READ_WRITE,
("Could not open socket."), (NULL));
return FALSE;
}
sp_set_data (self->pipe, self);
g_free (self->socket_path);
self->socket_path = g_strdup (sp_writer_get_path (self->pipe));
GST_DEBUG ("Created socket at %s", self->socket_path);
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);
self->pollthread =
g_thread_try_new ("gst-shmsink-poll-thread", pollthread_func, self, &err);
if (!self->pollthread)
goto thread_error;
self->allocator = gst_shm_sink_allocator_new (self);
return TRUE;
thread_error:
sp_writer_close (self->pipe, NULL, NULL);
self->pipe = NULL;
gst_poll_free (self->poll);
GST_ELEMENT_ERROR (self, CORE, THREAD, ("Could not start thread"),
("%s", err->message));
g_error_free (err);
return FALSE;
}
static gboolean
gst_shm_sink_stop (GstBaseSink * bsink)
{
GstShmSink *self = GST_SHM_SINK (bsink);
self->stop = TRUE;
gst_poll_set_flushing (self->poll, TRUE);
if (self->allocator)
gst_object_unref (self->allocator);
self->allocator = 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,
(sp_buffer_free_callback) gst_buffer_unref, NULL);
g_signal_emit (self, signals[SIGNAL_CLIENT_DISCONNECTED], 0,
client->pollfd.fd);
g_slice_free (struct GstShmClient, client);
}
gst_poll_free (self->poll);
self->poll = NULL;
sp_writer_close (self->pipe, NULL, NULL);
self->pipe = NULL;
return TRUE;
}
static gboolean
gst_shm_sink_can_render (GstShmSink * self, GstClockTime time)
{
ShmBuffer *b;
if (time == GST_CLOCK_TIME_NONE || self->buffer_time == GST_CLOCK_TIME_NONE)
return TRUE;
b = sp_writer_get_pending_buffers (self->pipe);
for (; b != NULL; b = sp_writer_get_next_buffer (b)) {
GstBuffer *buf = sp_writer_buf_get_tag (b);
if (GST_CLOCK_DIFF (time, GST_BUFFER_PTS (buf)) > self->buffer_time)
return FALSE;
}
return TRUE;
}
static GstFlowReturn
gst_shm_sink_render (GstBaseSink * bsink, GstBuffer * buf)
{
GstShmSink *self = GST_SHM_SINK (bsink);
int rv = 0;
GstMapInfo map;
gboolean need_new_memory = FALSE;
GstFlowReturn ret = GST_FLOW_OK;
GstMemory *memory = NULL;
GstBuffer *sendbuf = NULL;
gsize written_bytes;
GST_OBJECT_LOCK (self);
if (self->unlock) {
GST_OBJECT_UNLOCK (self);
return GST_FLOW_FLUSHING;
}
while (self->wait_for_connection && !self->clients) {
g_cond_wait (&self->cond, GST_OBJECT_GET_LOCK (self));
if (self->unlock) {
GST_OBJECT_UNLOCK (self);
ret = gst_base_sink_wait_preroll (bsink);
if (ret == GST_FLOW_OK)
GST_OBJECT_LOCK (self);
else
return ret;
}
}
while (!gst_shm_sink_can_render (self, GST_BUFFER_TIMESTAMP (buf))) {
g_cond_wait (&self->cond, GST_OBJECT_GET_LOCK (self));
if (self->unlock) {
GST_OBJECT_UNLOCK (self);
ret = gst_base_sink_wait_preroll (bsink);
if (ret == GST_FLOW_OK)
GST_OBJECT_LOCK (self);
else
return ret;
}
}
if (gst_buffer_n_memory (buf) > 1) {
GST_LOG_OBJECT (self, "Buffer %p has %d GstMemory, we only support a single"
" one, need to do a memcpy", buf, gst_buffer_n_memory (buf));
need_new_memory = TRUE;
} else {
memory = gst_buffer_peek_memory (buf, 0);
if (memory->allocator != GST_ALLOCATOR (self->allocator)) {
need_new_memory = TRUE;
GST_LOG_OBJECT (self, "Memory in buffer %p was not allocated by "
"%" GST_PTR_FORMAT ", will memcpy", buf, memory->allocator);
}
}
if (need_new_memory) {
if (gst_buffer_get_size (buf) > sp_writer_get_max_buf_size (self->pipe)) {
gsize area_size = sp_writer_get_max_buf_size (self->pipe);
GST_ELEMENT_ERROR (self, RESOURCE, NO_SPACE_LEFT, (NULL),
("Shared memory area of size %" G_GSIZE_FORMAT " is smaller than"
"buffer of size %" G_GSIZE_FORMAT, area_size,
gst_buffer_get_size (buf)));
goto error;
}
while ((memory =
gst_shm_sink_allocator_alloc_locked (self->allocator,
gst_buffer_get_size (buf), &self->params)) == NULL) {
g_cond_wait (&self->cond, GST_OBJECT_GET_LOCK (self));
if (self->unlock) {
GST_OBJECT_UNLOCK (self);
ret = gst_base_sink_wait_preroll (bsink);
if (ret == GST_FLOW_OK)
GST_OBJECT_LOCK (self);
else
return ret;
}
}
while (self->wait_for_connection && !self->clients) {
g_cond_wait (&self->cond, GST_OBJECT_GET_LOCK (self));
if (self->unlock) {
GST_OBJECT_UNLOCK (self);
ret = gst_base_sink_wait_preroll (bsink);
if (ret == GST_FLOW_OK) {
GST_OBJECT_LOCK (self);
} else {
gst_memory_unref (memory);
return ret;
}
}
}
if (!gst_memory_map (memory, &map, GST_MAP_WRITE)) {
GST_ELEMENT_ERROR (self, STREAM, FAILED,
(NULL), ("Failed to map memory"));
goto error;
}
GST_DEBUG_OBJECT (self,
"Copying %" G_GSIZE_FORMAT " bytes into map of size %" G_GSIZE_FORMAT
" bytes.", gst_buffer_get_size (buf), map.size);
written_bytes = gst_buffer_extract (buf, 0, map.data, map.size);
GST_DEBUG_OBJECT (self, "Copied %" G_GSIZE_FORMAT " bytes.", written_bytes);
gst_memory_unmap (memory, &map);
sendbuf = gst_buffer_new ();
if (!gst_buffer_copy_into (sendbuf, buf, GST_BUFFER_COPY_METADATA, 0, -1)) {
GST_ELEMENT_ERROR (self, STREAM, FAILED,
(NULL), ("Failed to copy data into send buffer"));
gst_buffer_unref (sendbuf);
goto error;
}
gst_buffer_append_memory (sendbuf, memory);
} else {
sendbuf = gst_buffer_ref (buf);
}
if (!gst_buffer_map (sendbuf, &map, GST_MAP_READ)) {
GST_ELEMENT_ERROR (self, STREAM, FAILED,
(NULL), ("Failed to map data into send buffer"));
goto error;
}
/* Make the memory readonly as of now as we've sent it to the other side
* We know it's not mapped for writing anywhere as we just mapped it for
* reading
*/
rv = sp_writer_send_buf (self->pipe, (char *) map.data, map.size, sendbuf);
if (rv == -1) {
GST_ELEMENT_ERROR (self, STREAM, FAILED,
(NULL), ("Failed to send data over SHM"));
gst_buffer_unmap (sendbuf, &map);
goto error;
}
gst_buffer_unmap (sendbuf, &map);
GST_OBJECT_UNLOCK (self);
if (rv == 0) {
GST_DEBUG_OBJECT (self, "No clients connected, unreffing buffer");
gst_buffer_unref (sendbuf);
}
return ret;
error:
GST_OBJECT_UNLOCK (self);
return GST_FLOW_ERROR;
}
static void
free_buffer_locked (GstBuffer * buffer, void *data)
{
GSList **list = data;
g_assert (buffer != NULL);
*list = g_slist_prepend (*list, buffer);
}
static gpointer
pollthread_func (gpointer data)
{
GstShmSink *self = GST_SHM_SINK (data);
GList *item;
GstClockTime timeout = GST_CLOCK_TIME_NONE;
int rv = 0;
while (!self->stop) {
do {
rv = gst_poll_wait (self->poll, timeout);
} while (rv < 0 && errno == EINTR);
if (rv < 0) {
GST_ELEMENT_ERROR (self, RESOURCE, READ,
("Failed waiting on fd activity"),
("gst_poll_wait returned %d, errno: %d", rv, errno));
return NULL;
}
timeout = GST_CLOCK_TIME_NONE;
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);
/* we need to call gst_poll_wait before calling gst_poll_* status
functions on that new descriptor, so restart the loop, so _wait
will have been called on all elements of self->poll, whether
they have just been added or not. */
timeout = 0;
continue;
}
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;
gpointer tag = NULL;
GST_OBJECT_LOCK (self);
rv = sp_writer_recv (self->pipe, gclient->client, &tag);
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;
}
g_assert (rv == 0 || tag == NULL);
if (rv == 0)
gst_buffer_unref (tag);
}
continue;
close_client:
{
GSList *list = NULL;
GST_OBJECT_LOCK (self);
sp_writer_close_client (self->pipe, gclient->client,
(sp_buffer_free_callback) free_buffer_locked, (void **) &list);
GST_OBJECT_UNLOCK (self);
g_slist_free_full (list, (GDestroyNotify) gst_buffer_unref);
}
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);
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_EOS:
GST_OBJECT_LOCK (self);
while (self->wait_for_connection && 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_BASE_SINK_CLASS (parent_class)->event (bsink, event);
}
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;
}
static gboolean
gst_shm_sink_propose_allocation (GstBaseSink * sink, GstQuery * query)
{
GstShmSink *self = GST_SHM_SINK (sink);
if (self->allocator)
gst_query_add_allocation_param (query, GST_ALLOCATOR (self->allocator),
NULL);
return TRUE;
}
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