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gstreamer/sys/ipcpipeline/gstipcpipelinecomm.c
Matthew Waters 640a65bf96 gst: don't use volatile to mean atomic 
volatile is not sufficient to provide atomic guarantees and real atomics
should be used instead.  GCC 11 has started warning about using volatile
with atomic operations.

https://gitlab.gnome.org/GNOME/glib/-/merge_requests/1719

Discovered in https://gitlab.freedesktop.org/gstreamer/gst-plugins-good/-/issues/868

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-bad/-/merge_requests/2098>
2021-03-22 14:34:36 +11:00

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/* GStreamer
* Copyright (C) 2015-2017 YouView TV Ltd
* Author: Vincent Penquerch <vincent.penquerch@collabora.co.uk>
*
* gstipcpipelinecomm.c:
*
* 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.
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#ifdef HAVE_UNISTD_H
# include <unistd.h>
#endif
#ifdef _MSC_VER
/* ssize_t is not available, so match return value of read()/write() on MSVC */
#define ssize_t int
#endif
#include <errno.h>
#include <string.h>
#include <gst/base/gstbytewriter.h>
#include <gst/gstprotection.h>
#include "gstipcpipelinecomm.h"
GST_DEBUG_CATEGORY_STATIC (gst_ipc_pipeline_comm_debug);
#define GST_CAT_DEFAULT gst_ipc_pipeline_comm_debug
#define DEFAULT_ACK_TIME (10 * G_TIME_SPAN_SECOND)
GQuark QUARK_ID;
typedef enum
{
ACK_TYPE_NONE,
ACK_TYPE_TIMED,
ACK_TYPE_BLOCKING
} AckType;
typedef enum
{
COMM_REQUEST_TYPE_BUFFER,
COMM_REQUEST_TYPE_EVENT,
COMM_REQUEST_TYPE_QUERY,
COMM_REQUEST_TYPE_STATE_CHANGE,
COMM_REQUEST_TYPE_MESSAGE,
} CommRequestType;
typedef struct
{
guint32 id;
gboolean replied;
gboolean comm_error;
guint32 ret;
GstQuery *query;
CommRequestType type;
GCond cond;
} CommRequest;
static const gchar *comm_request_ret_get_name (CommRequestType type,
guint32 ret);
static guint32 comm_request_ret_get_failure_value (CommRequestType type);
static CommRequest *
comm_request_new (guint32 id, CommRequestType type, GstQuery * query)
{
CommRequest *req;
req = g_malloc (sizeof (CommRequest));
req->id = id;
g_cond_init (&req->cond);
req->replied = FALSE;
req->comm_error = FALSE;
req->query = query;
req->ret = comm_request_ret_get_failure_value (type);
req->type = type;
return req;
}
static guint32
comm_request_wait (GstIpcPipelineComm * comm, CommRequest * req,
AckType ack_type)
{
guint32 ret = comm_request_ret_get_failure_value (req->type);
guint64 end_time;
if (ack_type == ACK_TYPE_TIMED)
end_time = g_get_monotonic_time () + comm->ack_time;
else
end_time = G_MAXUINT64;
GST_TRACE_OBJECT (comm->element, "Waiting for ACK/NAK for request %u",
req->id);
while (!req->replied) {
if (ack_type == ACK_TYPE_TIMED) {
if (!g_cond_wait_until (&req->cond, &comm->mutex, end_time))
break;
} else
g_cond_wait (&req->cond, &comm->mutex);
}
if (req->replied) {
ret = req->ret;
GST_TRACE_OBJECT (comm->element, "Got reply for request %u: %d (%s)",
req->id, ret, comm_request_ret_get_name (req->type, ret));
} else {
req->comm_error = TRUE;
GST_ERROR_OBJECT (comm->element, "Timeout waiting for reply for request %u",
req->id);
}
return ret;
}
static void
comm_request_free (CommRequest * req)
{
g_cond_clear (&req->cond);
g_free (req);
}
static const gchar *
comm_request_ret_get_name (CommRequestType type, guint32 ret)
{
switch (type) {
case COMM_REQUEST_TYPE_BUFFER:
return gst_flow_get_name (ret);
case COMM_REQUEST_TYPE_EVENT:
case COMM_REQUEST_TYPE_QUERY:
case COMM_REQUEST_TYPE_MESSAGE:
return ret ? "TRUE" : "FALSE";
case COMM_REQUEST_TYPE_STATE_CHANGE:
return gst_element_state_change_return_get_name (ret);
default:
g_assert_not_reached ();
}
}
static guint32
comm_request_ret_get_failure_value (CommRequestType type)
{
switch (type) {
case COMM_REQUEST_TYPE_BUFFER:
return GST_FLOW_COMM_ERROR;
case COMM_REQUEST_TYPE_EVENT:
case COMM_REQUEST_TYPE_MESSAGE:
case COMM_REQUEST_TYPE_QUERY:
return FALSE;
case COMM_REQUEST_TYPE_STATE_CHANGE:
return GST_STATE_CHANGE_FAILURE;
default:
g_assert_not_reached ();
}
}
static const gchar *
gst_ipc_pipeline_comm_data_type_get_name (GstIpcPipelineCommDataType type)
{
switch (type) {
case GST_IPC_PIPELINE_COMM_DATA_TYPE_ACK:
return "ACK";
case GST_IPC_PIPELINE_COMM_DATA_TYPE_QUERY_RESULT:
return "QUERY_RESULT";
case GST_IPC_PIPELINE_COMM_DATA_TYPE_BUFFER:
return "BUFFER";
case GST_IPC_PIPELINE_COMM_DATA_TYPE_EVENT:
return "EVENT";
case GST_IPC_PIPELINE_COMM_DATA_TYPE_SINK_MESSAGE_EVENT:
return "SINK_MESSAGE_EVENT";
case GST_IPC_PIPELINE_COMM_DATA_TYPE_QUERY:
return "QUERY";
case GST_IPC_PIPELINE_COMM_DATA_TYPE_STATE_CHANGE:
return "STATE_CHANGE";
case GST_IPC_PIPELINE_COMM_DATA_TYPE_STATE_LOST:
return "STATE_LOST";
case GST_IPC_PIPELINE_COMM_DATA_TYPE_MESSAGE:
return "MESSAGE";
case GST_IPC_PIPELINE_COMM_DATA_TYPE_GERROR_MESSAGE:
return "GERROR_MESSAGE";
default:
return "UNKNOWN";
}
}
static gboolean
gst_ipc_pipeline_comm_sync_fd (GstIpcPipelineComm * comm, guint32 id,
GstQuery * query, guint32 * ret, AckType ack_type, CommRequestType type)
{
CommRequest *req;
gboolean comm_error;
GHashTable *waiting_ids;
if (ack_type == ACK_TYPE_NONE)
return TRUE;
req = comm_request_new (id, type, query);
waiting_ids = g_hash_table_ref (comm->waiting_ids);
g_hash_table_insert (waiting_ids, GINT_TO_POINTER (id), req);
*ret = comm_request_wait (comm, req, ack_type);
comm_error = req->comm_error;
g_hash_table_remove (waiting_ids, GINT_TO_POINTER (id));
g_hash_table_unref (waiting_ids);
return !comm_error;
}
static gboolean
write_to_fd_raw (GstIpcPipelineComm * comm, const void *data, size_t size)
{
size_t offset;
gboolean ret = TRUE;
offset = 0;
GST_TRACE_OBJECT (comm->element, "Writing %u bytes to fdout",
(unsigned) size);
while (size) {
ssize_t written =
write (comm->fdout, (const unsigned char *) data + offset, size);
if (written < 0) {
if (errno == EAGAIN || errno == EINTR)
continue;
GST_ERROR_OBJECT (comm->element, "Failed to write to fd: %s",
strerror (errno));
ret = FALSE;
goto done;
}
size -= written;
offset += written;
}
done:
return ret;
}
static gboolean
write_byte_writer_to_fd (GstIpcPipelineComm * comm, GstByteWriter * bw)
{
guint8 *data;
gboolean ret;
guint size;
size = gst_byte_writer_get_size (bw);
data = gst_byte_writer_reset_and_get_data (bw);
if (!data)
return FALSE;
ret = write_to_fd_raw (comm, data, size);
g_free (data);
return ret;
}
static void
gst_ipc_pipeline_comm_write_ack_to_fd (GstIpcPipelineComm * comm, guint32 id,
guint32 ret, CommRequestType type)
{
const unsigned char payload_type = GST_IPC_PIPELINE_COMM_DATA_TYPE_ACK;
guint32 size;
GstByteWriter bw;
g_mutex_lock (&comm->mutex);
GST_TRACE_OBJECT (comm->element, "Writing ACK for %u: %s (%d)", id,
comm_request_ret_get_name (type, ret), ret);
gst_byte_writer_init (&bw);
if (!gst_byte_writer_put_uint8 (&bw, payload_type))
goto write_failed;
if (!gst_byte_writer_put_uint32_le (&bw, id))
goto write_failed;
size = sizeof (ret);
if (!gst_byte_writer_put_uint32_le (&bw, size))
goto write_failed;
if (!gst_byte_writer_put_uint32_le (&bw, ret))
goto write_failed;
if (!write_byte_writer_to_fd (comm, &bw))
goto write_failed;
done:
g_mutex_unlock (&comm->mutex);
gst_byte_writer_reset (&bw);
return;
write_failed:
GST_ELEMENT_ERROR (comm->element, RESOURCE, WRITE, (NULL),
("Failed to write to socket"));
goto done;
}
void
gst_ipc_pipeline_comm_write_flow_ack_to_fd (GstIpcPipelineComm * comm,
guint32 id, GstFlowReturn ret)
{
gst_ipc_pipeline_comm_write_ack_to_fd (comm, id, (guint32) ret,
COMM_REQUEST_TYPE_BUFFER);
}
void
gst_ipc_pipeline_comm_write_boolean_ack_to_fd (GstIpcPipelineComm * comm,
guint32 id, gboolean ret)
{
gst_ipc_pipeline_comm_write_ack_to_fd (comm, id, (guint32) ret,
COMM_REQUEST_TYPE_EVENT);
}
void
gst_ipc_pipeline_comm_write_state_change_ack_to_fd (GstIpcPipelineComm * comm,
guint32 id, GstStateChangeReturn ret)
{
gst_ipc_pipeline_comm_write_ack_to_fd (comm, id, (guint32) ret,
COMM_REQUEST_TYPE_STATE_CHANGE);
}
void
gst_ipc_pipeline_comm_write_query_result_to_fd (GstIpcPipelineComm * comm,
guint32 id, gboolean result, GstQuery * query)
{
const unsigned char payload_type =
GST_IPC_PIPELINE_COMM_DATA_TYPE_QUERY_RESULT;
guint8 result8 = result;
guint32 size;
size_t len;
char *str = NULL;
guint32 type;
const GstStructure *structure;
GstByteWriter bw;
g_mutex_lock (&comm->mutex);
GST_TRACE_OBJECT (comm->element,
"Writing query result for %u: %d, %" GST_PTR_FORMAT, id, result, query);
gst_byte_writer_init (&bw);
if (!gst_byte_writer_put_uint8 (&bw, payload_type))
goto write_failed;
if (!gst_byte_writer_put_uint32_le (&bw, id))
goto write_failed;
structure = gst_query_get_structure (query);
if (structure) {
str = gst_structure_to_string (structure);
len = strlen (str);
} else {
str = NULL;
len = 0;
}
size = 1 + sizeof (guint32) + len + 1;
if (!gst_byte_writer_put_uint32_le (&bw, size))
goto write_failed;
if (!gst_byte_writer_put_uint8 (&bw, result8))
goto write_failed;
type = GST_QUERY_TYPE (query);
if (!gst_byte_writer_put_uint32_le (&bw, type))
goto write_failed;
if (str) {
if (!gst_byte_writer_put_data (&bw, (const guint8 *) str, len + 1))
goto write_failed;
} else {
if (!gst_byte_writer_put_uint8 (&bw, 0))
goto write_failed;
}
if (!write_byte_writer_to_fd (comm, &bw))
goto write_failed;
done:
g_mutex_unlock (&comm->mutex);
gst_byte_writer_reset (&bw);
g_free (str);
return;
write_failed:
GST_ELEMENT_ERROR (comm->element, RESOURCE, WRITE, (NULL),
("Failed to write to socket"));
goto done;
}
static gboolean
gst_ipc_pipeline_comm_read_query_result (GstIpcPipelineComm * comm,
guint32 size, GstQuery ** query)
{
gchar *end = NULL;
GstStructure *structure;
guint8 result;
guint32 type;
const guint8 *payload = NULL;
guint32 mapped_size = size;
/* this should not be called if we don't have enough yet */
*query = NULL;
g_return_val_if_fail (gst_adapter_available (comm->adapter) >= size, FALSE);
g_return_val_if_fail (size >= 1 + sizeof (guint32), FALSE);
payload = gst_adapter_map (comm->adapter, mapped_size);
if (!payload)
return FALSE;
result = *payload++;
memcpy (&type, payload, sizeof (type));
payload += sizeof (type);
size -= 1 + sizeof (guint32);
if (size == 0)
goto done;
if (payload[size - 1]) {
result = FALSE;
goto done;
}
if (*payload) {
structure = gst_structure_from_string ((const char *) payload, &end);
} else {
structure = NULL;
}
if (!structure) {
result = FALSE;
goto done;
}
*query = gst_query_new_custom (type, structure);
done:
gst_adapter_unmap (comm->adapter);
gst_adapter_flush (comm->adapter, mapped_size);
return result;
}
typedef struct
{
guint32 bytes;
guint64 size;
guint32 flags;
guint64 api;
char *str;
} MetaBuildInfo;
typedef struct
{
GstIpcPipelineComm *comm;
guint32 n_meta;
guint32 total_bytes;
MetaBuildInfo *info;
} MetaListRepresentation;
static gboolean
build_meta (GstBuffer * buffer, GstMeta ** meta, gpointer user_data)
{
MetaListRepresentation *repr = user_data;
repr->n_meta++;
repr->info = g_realloc (repr->info, repr->n_meta * sizeof (MetaBuildInfo));
repr->info[repr->n_meta - 1].bytes =
/* 4 byte bytes */
4
/* 4 byte GstMetaFlags */
+ 4
/* GstMetaInfo::api */
+ 4 + strlen (g_type_name ((*meta)->info->api)) + 1
/* GstMetaInfo::size */
+ 8
/* str length */
+ 4;
repr->info[repr->n_meta - 1].flags = (*meta)->flags;
repr->info[repr->n_meta - 1].api = (*meta)->info->api;
repr->info[repr->n_meta - 1].size = (*meta)->info->size;
repr->info[repr->n_meta - 1].str = NULL;
/* GstMeta is a base class, and actual useful classes are all different...
So we list a few of them we know we want and ignore the open ended rest */
if ((*meta)->info->api == GST_PROTECTION_META_API_TYPE) {
GstProtectionMeta *m = (GstProtectionMeta *) * meta;
repr->info[repr->n_meta - 1].str = gst_structure_to_string (m->info);
repr->info[repr->n_meta - 1].bytes +=
strlen (repr->info[repr->n_meta - 1].str) + 1;
GST_TRACE_OBJECT (repr->comm->element, "Found GstMeta type %s: %s",
g_type_name ((*meta)->info->api), repr->info[repr->n_meta - 1].str);
} else {
GST_WARNING_OBJECT (repr->comm->element, "Ignoring GstMeta type %s",
g_type_name ((*meta)->info->api));
}
repr->total_bytes += repr->info[repr->n_meta - 1].bytes;
return TRUE;
}
typedef struct
{
guint64 pts;
guint64 dts;
guint64 duration;
guint64 offset;
guint64 offset_end;
guint64 flags;
} CommBufferMetadata;
GstFlowReturn
gst_ipc_pipeline_comm_write_buffer_to_fd (GstIpcPipelineComm * comm,
GstBuffer * buffer)
{
const unsigned char payload_type = GST_IPC_PIPELINE_COMM_DATA_TYPE_BUFFER;
GstMapInfo map;
guint32 ret32 = GST_FLOW_OK;
guint32 size, n;
CommBufferMetadata meta;
GstFlowReturn ret;
MetaListRepresentation repr = { comm, 0, 4, NULL }; /* starts a 4 for n_meta */
GstByteWriter bw;
g_mutex_lock (&comm->mutex);
++comm->send_id;
GST_TRACE_OBJECT (comm->element, "Writing buffer %u: %" GST_PTR_FORMAT,
comm->send_id, buffer);
gst_byte_writer_init (&bw);
meta.pts = GST_BUFFER_PTS (buffer);
meta.dts = GST_BUFFER_DTS (buffer);
meta.duration = GST_BUFFER_DURATION (buffer);
meta.offset = GST_BUFFER_OFFSET (buffer);
meta.offset_end = GST_BUFFER_OFFSET_END (buffer);
meta.flags = GST_BUFFER_FLAGS (buffer);
/* work out meta size */
gst_buffer_foreach_meta (buffer, build_meta, &repr);
if (!gst_byte_writer_put_uint8 (&bw, payload_type))
goto write_failed;
if (!gst_byte_writer_put_uint32_le (&bw, comm->send_id))
goto write_failed;
size =
gst_buffer_get_size (buffer) + sizeof (guint32) +
sizeof (CommBufferMetadata) + repr.total_bytes;
if (!gst_byte_writer_put_uint32_le (&bw, size))
goto write_failed;
if (!gst_byte_writer_put_data (&bw, (const guint8 *) &meta, sizeof (meta)))
goto write_failed;
size = gst_buffer_get_size (buffer);
if (!gst_byte_writer_put_uint32_le (&bw, size))
goto write_failed;
if (!write_byte_writer_to_fd (comm, &bw))
goto write_failed;
if (!gst_buffer_map (buffer, &map, GST_MAP_READ))
goto map_failed;
ret = write_to_fd_raw (comm, map.data, map.size);
gst_buffer_unmap (buffer, &map);
if (!ret)
goto write_failed;
/* meta */
gst_byte_writer_init (&bw);
if (!gst_byte_writer_put_uint32_le (&bw, repr.n_meta))
goto write_failed;
for (n = 0; n < repr.n_meta; ++n) {
const MetaBuildInfo *info = repr.info + n;
guint32 len;
const char *s;
if (!gst_byte_writer_put_uint32_le (&bw, info->bytes))
goto write_failed;
if (!gst_byte_writer_put_uint32_le (&bw, info->flags))
goto write_failed;
s = g_type_name (info->api);
len = strlen (s) + 1;
if (!gst_byte_writer_put_uint32_le (&bw, len))
goto write_failed;
if (!gst_byte_writer_put_data (&bw, (const guint8 *) s, len))
goto write_failed;
if (!gst_byte_writer_put_uint64_le (&bw, info->size))
goto write_failed;
s = info->str;
len = s ? (strlen (s) + 1) : 0;
if (!gst_byte_writer_put_uint32_le (&bw, len))
goto write_failed;
if (len)
if (!gst_byte_writer_put_data (&bw, (const guint8 *) s, len))
goto write_failed;
}
if (!write_byte_writer_to_fd (comm, &bw))
goto write_failed;
if (!gst_ipc_pipeline_comm_sync_fd (comm, comm->send_id, NULL, &ret32,
ACK_TYPE_BLOCKING, COMM_REQUEST_TYPE_BUFFER))
goto wait_failed;
ret = ret32;
done:
g_mutex_unlock (&comm->mutex);
gst_byte_writer_reset (&bw);
for (n = 0; n < repr.n_meta; ++n)
g_free (repr.info[n].str);
g_free (repr.info);
return ret;
write_failed:
GST_ELEMENT_ERROR (comm->element, RESOURCE, WRITE, (NULL),
("Failed to write to socket"));
ret = GST_FLOW_COMM_ERROR;
goto done;
wait_failed:
GST_ELEMENT_ERROR (comm->element, RESOURCE, WRITE, (NULL),
("Failed to wait for reply on socket"));
ret = GST_FLOW_COMM_ERROR;
goto done;
map_failed:
GST_ELEMENT_ERROR (comm->element, RESOURCE, READ, (NULL),
("Failed to map buffer"));
ret = GST_FLOW_ERROR;
goto done;
}
static GstBuffer *
gst_ipc_pipeline_comm_read_buffer (GstIpcPipelineComm * comm, guint32 size)
{
GstBuffer *buffer;
CommBufferMetadata meta;
guint32 n_meta, n;
const guint8 *payload = NULL;
guint32 mapped_size, buffer_data_size;
/* this should not be called if we don't have enough yet */
g_return_val_if_fail (gst_adapter_available (comm->adapter) >= size, NULL);
g_return_val_if_fail (size >= sizeof (CommBufferMetadata), NULL);
mapped_size = sizeof (CommBufferMetadata) + sizeof (buffer_data_size);
payload = gst_adapter_map (comm->adapter, mapped_size);
if (!payload)
return NULL;
memcpy (&meta, payload, sizeof (CommBufferMetadata));
payload += sizeof (CommBufferMetadata);
memcpy (&buffer_data_size, payload, sizeof (buffer_data_size));
size -= mapped_size;
gst_adapter_unmap (comm->adapter);
gst_adapter_flush (comm->adapter, mapped_size);
if (buffer_data_size == 0) {
buffer = gst_buffer_new ();
} else {
buffer = gst_adapter_get_buffer (comm->adapter, buffer_data_size);
gst_adapter_flush (comm->adapter, buffer_data_size);
}
size -= buffer_data_size;
GST_BUFFER_PTS (buffer) = meta.pts;
GST_BUFFER_DTS (buffer) = meta.dts;
GST_BUFFER_DURATION (buffer) = meta.duration;
GST_BUFFER_OFFSET (buffer) = meta.offset;
GST_BUFFER_OFFSET_END (buffer) = meta.offset_end;
GST_BUFFER_FLAGS (buffer) = meta.flags;
/* If you don't call that, the GType isn't yet known at the
g_type_from_name below */
gst_protection_meta_get_info ();
mapped_size = size;
payload = gst_adapter_map (comm->adapter, mapped_size);
if (!payload) {
gst_buffer_unref (buffer);
return NULL;
}
memcpy (&n_meta, payload, sizeof (n_meta));
payload += sizeof (n_meta);
for (n = 0; n < n_meta; ++n) {
guint32 flags, len, bytes;
guint64 msize;
GType api;
GstMeta *meta;
GstStructure *structure = NULL;
memcpy (&bytes, payload, sizeof (bytes));
payload += sizeof (bytes);
#define READ_FIELD(f) do { \
memcpy (&f, payload, sizeof (f)); \
payload += sizeof(f); \
} while(0)
READ_FIELD (flags);
READ_FIELD (len);
api = g_type_from_name ((const char *) payload);
payload = (const guint8 *) strchr ((const char *) payload, 0) + 1;
READ_FIELD (msize);
READ_FIELD (len);
if (len) {
structure = gst_structure_new_from_string ((const char *) payload);
payload += len + 1;
}
/* Seems we can add a meta from the api nor type ? */
if (api == GST_PROTECTION_META_API_TYPE) {
meta =
gst_buffer_add_meta (buffer, gst_protection_meta_get_info (), NULL);
((GstProtectionMeta *) meta)->info = structure;
} else {
GST_WARNING_OBJECT (comm->element, "Unsupported meta: %s",
g_type_name (api));
if (structure)
gst_structure_free (structure);
}
#undef READ_FIELD
}
gst_adapter_unmap (comm->adapter);
gst_adapter_flush (comm->adapter, mapped_size);
return buffer;
}
static gboolean
gst_ipc_pipeline_comm_write_sink_message_event_to_fd (GstIpcPipelineComm * comm,
GstEvent * event)
{
const unsigned char payload_type =
GST_IPC_PIPELINE_COMM_DATA_TYPE_SINK_MESSAGE_EVENT;
gboolean ret;
guint32 type, size, eseqnum, mseqnum, ret32 = TRUE, slen, structure_slen;
char *str = NULL;
const GstStructure *structure;
GstMessage *message = NULL;
const char *name;
GstByteWriter bw;
g_return_val_if_fail (GST_EVENT_TYPE (event) == GST_EVENT_SINK_MESSAGE,
FALSE);
g_mutex_lock (&comm->mutex);
++comm->send_id;
GST_TRACE_OBJECT (comm->element,
"Writing sink message event %u: %" GST_PTR_FORMAT, comm->send_id, event);
gst_byte_writer_init (&bw);
if (!gst_byte_writer_put_uint8 (&bw, payload_type))
goto write_failed;
if (!gst_byte_writer_put_uint32_le (&bw, comm->send_id))
goto write_failed;
name = gst_structure_get_name (gst_event_get_structure (event));
slen = strlen (name) + 1;
gst_event_parse_sink_message (event, &message);
structure = gst_message_get_structure (message);
if (structure) {
str = gst_structure_to_string (structure);
structure_slen = strlen (str);
} else {
str = NULL;
structure_slen = 0;
}
size = sizeof (type) + sizeof (eseqnum) + sizeof (mseqnum) + sizeof (slen) +
strlen (name) + 1 + structure_slen + 1;
if (!gst_byte_writer_put_uint32_le (&bw, size))
goto write_failed;
type = GST_MESSAGE_TYPE (message);
if (!gst_byte_writer_put_uint32_le (&bw, type))
goto write_failed;
size -= sizeof (type);
eseqnum = GST_EVENT_SEQNUM (event);
if (!gst_byte_writer_put_uint32_le (&bw, eseqnum))
goto write_failed;
size -= sizeof (eseqnum);
mseqnum = GST_MESSAGE_SEQNUM (message);
if (!gst_byte_writer_put_uint32_le (&bw, mseqnum))
goto write_failed;
size -= sizeof (mseqnum);
if (!gst_byte_writer_put_uint32_le (&bw, slen))
goto write_failed;
size -= sizeof (slen);
if (!gst_byte_writer_put_data (&bw, (const guint8 *) name, slen))
goto write_failed;
size -= slen;
if (str) {
if (!gst_byte_writer_put_data (&bw, (const guint8 *) str, size))
goto write_failed;
} else {
if (!gst_byte_writer_put_uint8 (&bw, 0))
goto write_failed;
}
if (!write_byte_writer_to_fd (comm, &bw))
goto write_failed;
if (!gst_ipc_pipeline_comm_sync_fd (comm, comm->send_id, NULL, &ret32,
GST_EVENT_IS_SERIALIZED (event) ? ACK_TYPE_BLOCKING : ACK_TYPE_TIMED,
COMM_REQUEST_TYPE_EVENT))
goto write_failed;
ret = ret32;
done:
g_mutex_unlock (&comm->mutex);
gst_byte_writer_reset (&bw);
g_free (str);
if (message)
gst_message_unref (message);
return ret;
write_failed:
GST_ELEMENT_ERROR (comm->element, RESOURCE, WRITE, (NULL),
("Failed to write to socket"));
ret = FALSE;
goto done;
}
static GstEvent *
gst_ipc_pipeline_comm_read_sink_message_event (GstIpcPipelineComm * comm,
guint32 size)
{
GstMessage *message;
GstEvent *event = NULL;
gchar *end = NULL;
GstStructure *structure;
guint32 type, eseqnum, mseqnum, slen;
const char *name;
guint32 mapped_size = size;
const guint8 *payload;
/* this should not be called if we don't have enough yet */
g_return_val_if_fail (gst_adapter_available (comm->adapter) >= size, NULL);
g_return_val_if_fail (size >= sizeof (type) + sizeof (slen), NULL);
payload = gst_adapter_map (comm->adapter, mapped_size);
if (!payload)
return NULL;
memcpy (&type, payload, sizeof (type));
payload += sizeof (type);
size -= sizeof (type);
if (size == 0)
goto done;
memcpy (&eseqnum, payload, sizeof (eseqnum));
payload += sizeof (eseqnum);
size -= sizeof (eseqnum);
if (size == 0)
goto done;
memcpy (&mseqnum, payload, sizeof (mseqnum));
payload += sizeof (mseqnum);
size -= sizeof (mseqnum);
if (size == 0)
goto done;
memcpy (&slen, payload, sizeof (slen));
payload += sizeof (slen);
size -= sizeof (slen);
if (size == 0)
goto done;
if (payload[slen - 1])
goto done;
name = (const char *) payload;
payload += slen;
size -= slen;
if ((payload)[size - 1]) {
goto done;
}
if (*payload) {
structure = gst_structure_from_string ((const char *) payload, &end);
} else {
structure = NULL;
}
message =
gst_message_new_custom (type, GST_OBJECT (comm->element), structure);
gst_message_set_seqnum (message, mseqnum);
event = gst_event_new_sink_message (name, message);
gst_event_set_seqnum (event, eseqnum);
gst_message_unref (message);
done:
gst_adapter_unmap (comm->adapter);
gst_adapter_flush (comm->adapter, mapped_size);
return event;
}
gboolean
gst_ipc_pipeline_comm_write_event_to_fd (GstIpcPipelineComm * comm,
gboolean upstream, GstEvent * event)
{
const unsigned char payload_type = GST_IPC_PIPELINE_COMM_DATA_TYPE_EVENT;
gboolean ret;
guint32 type, size, ret32 = TRUE, seqnum, slen;
char *str = NULL;
const GstStructure *structure;
GstByteWriter bw;
/* we special case sink-message event as gst can't serialize/de-serialize it */
if (GST_EVENT_TYPE (event) == GST_EVENT_SINK_MESSAGE)
return gst_ipc_pipeline_comm_write_sink_message_event_to_fd (comm, event);
g_mutex_lock (&comm->mutex);
++comm->send_id;
GST_TRACE_OBJECT (comm->element, "Writing event %u: %" GST_PTR_FORMAT,
comm->send_id, event);
gst_byte_writer_init (&bw);
if (!gst_byte_writer_put_uint8 (&bw, payload_type))
goto write_failed;
if (!gst_byte_writer_put_uint32_le (&bw, comm->send_id))
goto write_failed;
structure = gst_event_get_structure (event);
if (structure) {
if (GST_EVENT_TYPE (event) == GST_EVENT_STREAM_START) {
GstStructure *s = gst_structure_copy (structure);
gst_structure_remove_field (s, "stream");
str = gst_structure_to_string (s);
gst_structure_free (s);
} else {
str = gst_structure_to_string (structure);
}
slen = strlen (str);
} else {
str = NULL;
slen = 0;
}
size = sizeof (type) + sizeof (seqnum) + 1 + slen + 1;
if (!gst_byte_writer_put_uint32_le (&bw, size))
goto write_failed;
type = GST_EVENT_TYPE (event);
if (!gst_byte_writer_put_uint32_le (&bw, type))
goto write_failed;
seqnum = GST_EVENT_SEQNUM (event);
if (!gst_byte_writer_put_uint32_le (&bw, seqnum))
goto write_failed;
if (!gst_byte_writer_put_uint8 (&bw, upstream ? 1 : 0))
goto write_failed;
if (str) {
if (!gst_byte_writer_put_data (&bw, (const guint8 *) str, slen + 1))
goto write_failed;
} else {
if (!gst_byte_writer_put_uint8 (&bw, 0))
goto write_failed;
}
if (!write_byte_writer_to_fd (comm, &bw))
goto write_failed;
/* Upstream events get serialized, this is required to send seeks only
* one at a time. */
if (!gst_ipc_pipeline_comm_sync_fd (comm, comm->send_id, NULL, &ret32,
(GST_EVENT_IS_SERIALIZED (event) || GST_EVENT_IS_UPSTREAM (event)) ?
ACK_TYPE_BLOCKING : ACK_TYPE_NONE, COMM_REQUEST_TYPE_EVENT))
goto write_failed;
ret = ret32;
done:
g_mutex_unlock (&comm->mutex);
g_free (str);
gst_byte_writer_reset (&bw);
return ret;
write_failed:
GST_ELEMENT_ERROR (comm->element, RESOURCE, WRITE, (NULL),
("Failed to write to socket"));
ret = FALSE;
goto done;
}
static GstEvent *
gst_ipc_pipeline_comm_read_event (GstIpcPipelineComm * comm, guint32 size,
gboolean * upstream)
{
GstEvent *event = NULL;
gchar *end = NULL;
GstStructure *structure;
guint32 type, seqnum;
guint32 mapped_size = size;
const guint8 *payload;
/* this should not be called if we don't have enough yet */
g_return_val_if_fail (gst_adapter_available (comm->adapter) >= size, NULL);
g_return_val_if_fail (size >= sizeof (type), NULL);
payload = gst_adapter_map (comm->adapter, mapped_size);
if (!payload)
return NULL;
memcpy (&type, payload, sizeof (type));
payload += sizeof (type);
size -= sizeof (type);
if (size == 0)
goto done;
memcpy (&seqnum, payload, sizeof (seqnum));
payload += sizeof (seqnum);
size -= sizeof (seqnum);
if (size == 0)
goto done;
*upstream = (*payload) ? TRUE : FALSE;
payload += 1;
size -= 1;
if (size == 0)
goto done;
if (payload[size - 1])
goto done;
if (*payload) {
structure = gst_structure_from_string ((const char *) payload, &end);
} else {
structure = NULL;
}
event = gst_event_new_custom (type, structure);
gst_event_set_seqnum (event, seqnum);
done:
gst_adapter_unmap (comm->adapter);
gst_adapter_flush (comm->adapter, mapped_size);
return event;
}
gboolean
gst_ipc_pipeline_comm_write_query_to_fd (GstIpcPipelineComm * comm,
gboolean upstream, GstQuery * query)
{
const unsigned char payload_type = GST_IPC_PIPELINE_COMM_DATA_TYPE_QUERY;
gboolean ret;
guint32 type, size, ret32 = TRUE, slen;
char *str = NULL;
const GstStructure *structure;
GstByteWriter bw;
g_mutex_lock (&comm->mutex);
++comm->send_id;
GST_TRACE_OBJECT (comm->element, "Writing query %u: %" GST_PTR_FORMAT,
comm->send_id, query);
gst_byte_writer_init (&bw);
if (!gst_byte_writer_put_uint8 (&bw, payload_type))
goto write_failed;
if (!gst_byte_writer_put_uint32_le (&bw, comm->send_id))
goto write_failed;
structure = gst_query_get_structure (query);
if (structure) {
str = gst_structure_to_string (structure);
slen = strlen (str);
} else {
str = NULL;
slen = 0;
}
size = sizeof (type) + 1 + slen + 1;
if (!gst_byte_writer_put_uint32_le (&bw, size))
goto write_failed;
type = GST_QUERY_TYPE (query);
if (!gst_byte_writer_put_uint32_le (&bw, type))
goto write_failed;
if (!gst_byte_writer_put_uint8 (&bw, upstream ? 1 : 0))
goto write_failed;
if (str) {
if (!gst_byte_writer_put_data (&bw, (const guint8 *) str, slen + 1))
goto write_failed;
} else {
if (!gst_byte_writer_put_uint8 (&bw, 0))
goto write_failed;
}
if (!write_byte_writer_to_fd (comm, &bw))
goto write_failed;
if (!gst_ipc_pipeline_comm_sync_fd (comm, comm->send_id, query, &ret32,
GST_QUERY_IS_SERIALIZED (query) ? ACK_TYPE_BLOCKING : ACK_TYPE_TIMED,
COMM_REQUEST_TYPE_QUERY))
goto write_failed;
ret = ret32;
done:
g_mutex_unlock (&comm->mutex);
g_free (str);
gst_byte_writer_reset (&bw);
return ret;
write_failed:
GST_ELEMENT_ERROR (comm->element, RESOURCE, WRITE, (NULL),
("Failed to write to socket"));
ret = FALSE;
goto done;
}
static GstQuery *
gst_ipc_pipeline_comm_read_query (GstIpcPipelineComm * comm, guint32 size,
gboolean * upstream)
{
GstQuery *query = NULL;
gchar *end = NULL;
GstStructure *structure;
guint32 type;
guint32 mapped_size = size;
const guint8 *payload;
/* this should not be called if we don't have enough yet */
g_return_val_if_fail (gst_adapter_available (comm->adapter) >= size, NULL);
g_return_val_if_fail (size >= sizeof (type), NULL);
payload = gst_adapter_map (comm->adapter, mapped_size);
if (!payload)
return NULL;
memcpy (&type, payload, sizeof (type));
payload += sizeof (type);
size -= sizeof (type);
if (size == 0)
goto done;
*upstream = (*payload) ? TRUE : FALSE;
payload += 1;
size -= 1;
if (size == 0)
goto done;
if (payload[size - 1])
goto done;
if (*payload) {
structure = gst_structure_from_string ((const char *) payload, &end);
} else {
structure = NULL;
}
query = gst_query_new_custom (type, structure);
/* CAPS queries contain a filter field, of GstCaps type, which can be NULL.
This does not play well with the serialization/deserialization system,
which will give us a non-NULL GstCaps which has a value of NULL. This
in turn wreaks havoc with any code that tests whether filter is NULL
(which basically means, am I being given an optional GstCaps ?).
So we look for non-NULL GstCaps which have NULL contents, and replace
them with NULL instead. */
if (GST_QUERY_TYPE (query) == GST_QUERY_CAPS) {
GstCaps *filter;
gst_query_parse_caps (query, &filter);
if (filter
&& !strcmp (gst_structure_get_name (gst_caps_get_structure (filter, 0)),
"NULL")) {
gst_query_unref (query);
query = gst_query_new_caps (NULL);
}
}
done:
gst_adapter_unmap (comm->adapter);
gst_adapter_flush (comm->adapter, mapped_size);
return query;
}
GstStateChangeReturn
gst_ipc_pipeline_comm_write_state_change_to_fd (GstIpcPipelineComm * comm,
GstStateChange transition)
{
const unsigned char payload_type =
GST_IPC_PIPELINE_COMM_DATA_TYPE_STATE_CHANGE;
GstStateChangeReturn ret;
guint32 size, ret32 = GST_STATE_CHANGE_SUCCESS;
GstByteWriter bw;
g_mutex_lock (&comm->mutex);
++comm->send_id;
GST_TRACE_OBJECT (comm->element, "Writing state change %u: %s -> %s",
comm->send_id,
gst_element_state_get_name (GST_STATE_TRANSITION_CURRENT (transition)),
gst_element_state_get_name (GST_STATE_TRANSITION_NEXT (transition)));
gst_byte_writer_init (&bw);
if (!gst_byte_writer_put_uint8 (&bw, payload_type))
goto write_failed;
if (!gst_byte_writer_put_uint32_le (&bw, comm->send_id))
goto write_failed;
size = sizeof (transition);
if (!gst_byte_writer_put_uint32_le (&bw, size))
goto write_failed;
if (!gst_byte_writer_put_uint32_le (&bw, transition))
goto write_failed;
if (!write_byte_writer_to_fd (comm, &bw))
goto write_failed;
if (!gst_ipc_pipeline_comm_sync_fd (comm, comm->send_id, NULL, &ret32,
ACK_TYPE_TIMED, COMM_REQUEST_TYPE_STATE_CHANGE))
goto write_failed;
ret = ret32;
done:
g_mutex_unlock (&comm->mutex);
gst_byte_writer_reset (&bw);
return ret;
write_failed:
GST_ELEMENT_ERROR (comm->element, RESOURCE, WRITE, (NULL),
("Failed to write to socket"));
ret = GST_STATE_CHANGE_FAILURE;
goto done;
}
static gboolean
is_valid_state_change (GstStateChange transition)
{
if (transition == GST_STATE_CHANGE_NULL_TO_READY)
return TRUE;
if (transition == GST_STATE_CHANGE_READY_TO_PAUSED)
return TRUE;
if (transition == GST_STATE_CHANGE_PAUSED_TO_PLAYING)
return TRUE;
if (transition == GST_STATE_CHANGE_PLAYING_TO_PAUSED)
return TRUE;
if (transition == GST_STATE_CHANGE_PAUSED_TO_READY)
return TRUE;
if (transition == GST_STATE_CHANGE_READY_TO_NULL)
return TRUE;
if (GST_STATE_TRANSITION_CURRENT (transition) ==
GST_STATE_TRANSITION_NEXT (transition))
return TRUE;
return FALSE;
}
static gboolean
gst_ipc_pipeline_comm_read_state_change (GstIpcPipelineComm * comm,
guint32 size, guint32 * transition)
{
guint32 mapped_size = size;
const guint8 *payload;
/* this should not be called if we don't have enough yet */
g_return_val_if_fail (gst_adapter_available (comm->adapter) >= size, FALSE);
g_return_val_if_fail (size >= sizeof (*transition), FALSE);
payload = gst_adapter_map (comm->adapter, size);
if (!payload)
return FALSE;
memcpy (transition, payload, sizeof (*transition));
gst_adapter_unmap (comm->adapter);
gst_adapter_flush (comm->adapter, mapped_size);
return is_valid_state_change (*transition);
}
void
gst_ipc_pipeline_comm_write_state_lost_to_fd (GstIpcPipelineComm * comm)
{
const unsigned char payload_type = GST_IPC_PIPELINE_COMM_DATA_TYPE_STATE_LOST;
guint32 size;
GstByteWriter bw;
g_mutex_lock (&comm->mutex);
++comm->send_id;
GST_TRACE_OBJECT (comm->element, "Writing state-lost %u", comm->send_id);
gst_byte_writer_init (&bw);
if (!gst_byte_writer_put_uint8 (&bw, payload_type))
goto write_failed;
if (!gst_byte_writer_put_uint32_le (&bw, comm->send_id))
goto write_failed;
size = 0;
if (!gst_byte_writer_put_uint32_le (&bw, size))
goto write_failed;
if (!write_byte_writer_to_fd (comm, &bw))
goto write_failed;
done:
g_mutex_unlock (&comm->mutex);
gst_byte_writer_reset (&bw);
return;
write_failed:
GST_ELEMENT_ERROR (comm->element, RESOURCE, WRITE, (NULL),
("Failed to write to socket"));
goto done;
}
static gboolean
gst_ipc_pipeline_comm_read_state_lost (GstIpcPipelineComm * comm, guint32 size)
{
/* no payload */
return TRUE;
}
static gboolean
gst_ipc_pipeline_comm_write_gerror_message_to_fd (GstIpcPipelineComm * comm,
GstMessage * message)
{
const unsigned char payload_type =
GST_IPC_PIPELINE_COMM_DATA_TYPE_GERROR_MESSAGE;
gboolean ret;
guint32 code, size, ret32 = TRUE;
char *str = NULL;
GError *error;
char *extra_message;
const char *domain_string;
unsigned char msgtype;
GstByteWriter bw;
g_mutex_lock (&comm->mutex);
++comm->send_id;
if (GST_MESSAGE_TYPE (message) == GST_MESSAGE_ERROR) {
gst_message_parse_error (message, &error, &extra_message);
msgtype = 2;
} else if (GST_MESSAGE_TYPE (message) == GST_MESSAGE_WARNING) {
gst_message_parse_warning (message, &error, &extra_message);
msgtype = 1;
} else {
gst_message_parse_info (message, &error, &extra_message);
msgtype = 0;
}
code = error->code;
domain_string = g_quark_to_string (error->domain);
GST_TRACE_OBJECT (comm->element,
"Writing error %u: domain %s, code %u, message %s, extra message %s",
comm->send_id, domain_string, error->code, error->message, extra_message);
gst_byte_writer_init (&bw);
if (!gst_byte_writer_put_uint8 (&bw, payload_type))
goto write_failed;
if (!gst_byte_writer_put_uint32_le (&bw, comm->send_id))
goto write_failed;
size = sizeof (size);
size += 1;
size += strlen (domain_string) + 1;
size += sizeof (code);
size += sizeof (size);
size += error->message ? strlen (error->message) + 1 : 0;
size += sizeof (size);
size += extra_message ? strlen (extra_message) + 1 : 0;
if (!gst_byte_writer_put_uint32_le (&bw, size))
goto write_failed;
if (!gst_byte_writer_put_uint8 (&bw, msgtype))
goto write_failed;
size = strlen (domain_string) + 1;
if (!gst_byte_writer_put_uint32_le (&bw, size))
goto write_failed;
if (!gst_byte_writer_put_data (&bw, (const guint8 *) domain_string, size))
goto write_failed;
if (!gst_byte_writer_put_uint32_le (&bw, code))
goto write_failed;
size = error->message ? strlen (error->message) + 1 : 0;
if (!gst_byte_writer_put_uint32_le (&bw, size))
goto write_failed;
if (error->message) {
if (!gst_byte_writer_put_data (&bw, (const guint8 *) error->message, size))
goto write_failed;
}
size = extra_message ? strlen (extra_message) + 1 : 0;
if (!gst_byte_writer_put_uint32_le (&bw, size))
goto write_failed;
if (extra_message) {
if (!gst_byte_writer_put_data (&bw, (const guint8 *) extra_message, size))
goto write_failed;
}
if (!write_byte_writer_to_fd (comm, &bw))
goto write_failed;
if (!gst_ipc_pipeline_comm_sync_fd (comm, comm->send_id, NULL, &ret32,
ACK_TYPE_NONE, COMM_REQUEST_TYPE_MESSAGE))
goto write_failed;
ret = ret32;
done:
g_mutex_unlock (&comm->mutex);
g_free (str);
g_error_free (error);
g_free (extra_message);
gst_byte_writer_reset (&bw);
return ret;
write_failed:
GST_ELEMENT_ERROR (comm->element, RESOURCE, WRITE, (NULL),
("Failed to write to socket"));
ret = FALSE;
goto done;
}
static GstMessage *
gst_ipc_pipeline_comm_read_gerror_message (GstIpcPipelineComm * comm,
guint32 size)
{
GstMessage *message = NULL;
guint32 code;
GQuark domain;
const char *msg, *extra_message;
GError *error;
unsigned char msgtype;
guint32 mapped_size = size;
const guint8 *payload;
/* this should not be called if we don't have enough yet */
g_return_val_if_fail (gst_adapter_available (comm->adapter) >= size, NULL);
g_return_val_if_fail (size >= sizeof (code) + sizeof (size) * 3 + 1 + 1,
NULL);
payload = gst_adapter_map (comm->adapter, mapped_size);
if (!payload)
return NULL;
msgtype = *payload++;
memcpy (&size, payload, sizeof (size));
payload += sizeof (size);
if (payload[size - 1])
goto done;
domain = g_quark_from_string ((const char *) payload);
payload += size;
memcpy (&code, payload, sizeof (code));
payload += sizeof (code);
memcpy (&size, payload, sizeof (size));
payload += sizeof (size);
if (size) {
if (payload[size - 1])
goto done;
msg = (const char *) payload;
} else {
msg = NULL;
}
payload += size;
memcpy (&size, payload, sizeof (size));
payload += sizeof (size);
if (size) {
if (payload[size - 1])
goto done;
extra_message = (const char *) payload;
} else {
extra_message = NULL;
}
payload += size;
error = g_error_new (domain, code, "%s", msg);
if (msgtype == 2)
message =
gst_message_new_error (GST_OBJECT (comm->element), error,
extra_message);
else if (msgtype == 1)
message =
gst_message_new_warning (GST_OBJECT (comm->element), error,
extra_message);
else
message =
gst_message_new_info (GST_OBJECT (comm->element), error, extra_message);
g_error_free (error);
done:
gst_adapter_unmap (comm->adapter);
gst_adapter_flush (comm->adapter, mapped_size);
return message;
}
gboolean
gst_ipc_pipeline_comm_write_message_to_fd (GstIpcPipelineComm * comm,
GstMessage * message)
{
const unsigned char payload_type = GST_IPC_PIPELINE_COMM_DATA_TYPE_MESSAGE;
gboolean ret;
guint32 type, size, ret32 = TRUE, slen;
char *str = NULL;
const GstStructure *structure;
GstByteWriter bw;
/* we special case error as gst can't serialize/de-serialize it */
if (GST_MESSAGE_TYPE (message) == GST_MESSAGE_ERROR
|| GST_MESSAGE_TYPE (message) == GST_MESSAGE_WARNING
|| GST_MESSAGE_TYPE (message) == GST_MESSAGE_INFO)
return gst_ipc_pipeline_comm_write_gerror_message_to_fd (comm, message);
g_mutex_lock (&comm->mutex);
++comm->send_id;
GST_TRACE_OBJECT (comm->element, "Writing message %u: %" GST_PTR_FORMAT,
comm->send_id, message);
gst_byte_writer_init (&bw);
if (!gst_byte_writer_put_uint8 (&bw, payload_type))
goto write_failed;
if (!gst_byte_writer_put_uint32_le (&bw, comm->send_id))
goto write_failed;
structure = gst_message_get_structure (message);
if (structure) {
str = gst_structure_to_string (structure);
slen = strlen (str);
} else {
str = NULL;
slen = 0;
}
size = sizeof (type) + slen + 1;
if (!gst_byte_writer_put_uint32_le (&bw, size))
goto write_failed;
type = GST_MESSAGE_TYPE (message);
if (!gst_byte_writer_put_uint32_le (&bw, type))
goto write_failed;
size -= sizeof (type);
if (str) {
if (!gst_byte_writer_put_data (&bw, (const guint8 *) str, size))
goto write_failed;
} else {
if (!gst_byte_writer_put_uint8 (&bw, 0))
goto write_failed;
}
if (!write_byte_writer_to_fd (comm, &bw))
goto write_failed;
if (!gst_ipc_pipeline_comm_sync_fd (comm, comm->send_id, NULL, &ret32,
ACK_TYPE_NONE, COMM_REQUEST_TYPE_MESSAGE))
goto write_failed;
ret = ret32;
done:
g_mutex_unlock (&comm->mutex);
g_free (str);
gst_byte_writer_reset (&bw);
return ret;
write_failed:
GST_ELEMENT_ERROR (comm->element, RESOURCE, WRITE, (NULL),
("Failed to write to socket"));
ret = FALSE;
goto done;
}
static GstMessage *
gst_ipc_pipeline_comm_read_message (GstIpcPipelineComm * comm, guint32 size)
{
GstMessage *message = NULL;
gchar *end = NULL;
GstStructure *structure;
guint32 type;
guint32 mapped_size = size;
const guint8 *payload;
/* this should not be called if we don't have enough yet */
g_return_val_if_fail (gst_adapter_available (comm->adapter) >= size, NULL);
g_return_val_if_fail (size >= sizeof (type), NULL);
payload = gst_adapter_map (comm->adapter, mapped_size);
if (!payload)
return NULL;
memcpy (&type, payload, sizeof (type));
payload += sizeof (type);
size -= sizeof (type);
if (size == 0)
goto done;
if (payload[size - 1])
goto done;
if (*payload) {
structure = gst_structure_from_string ((const char *) payload, &end);
} else {
structure = NULL;
}
message =
gst_message_new_custom (type, GST_OBJECT (comm->element), structure);
done:
gst_adapter_unmap (comm->adapter);
gst_adapter_flush (comm->adapter, mapped_size);
return message;
}
void
gst_ipc_pipeline_comm_init (GstIpcPipelineComm * comm, GstElement * element)
{
g_mutex_init (&comm->mutex);
comm->element = element;
comm->fdin = comm->fdout = -1;
comm->ack_time = DEFAULT_ACK_TIME;
comm->waiting_ids =
g_hash_table_new_full (g_direct_hash, g_direct_equal, NULL,
(GDestroyNotify) comm_request_free);
comm->adapter = gst_adapter_new ();
comm->poll = gst_poll_new (TRUE);
gst_poll_fd_init (&comm->pollFDin);
}
void
gst_ipc_pipeline_comm_clear (GstIpcPipelineComm * comm)
{
g_hash_table_destroy (comm->waiting_ids);
gst_object_unref (comm->adapter);
gst_poll_free (comm->poll);
g_mutex_clear (&comm->mutex);
}
static void
cancel_request (gpointer key, gpointer value, gpointer user_data,
GstFlowReturn fret)
{
GstIpcPipelineComm *comm = (GstIpcPipelineComm *) user_data;
guint32 id = GPOINTER_TO_INT (key);
CommRequest *req = (CommRequest *) value;
GST_TRACE_OBJECT (comm->element, "Cancelling request %u, type %d", id,
req->type);
req->ret = fret;
req->replied = TRUE;
g_cond_signal (&req->cond);
}
static void
cancel_request_error (gpointer key, gpointer value, gpointer user_data)
{
CommRequest *req = (CommRequest *) value;
GstFlowReturn fret = comm_request_ret_get_failure_value (req->type);
cancel_request (key, value, user_data, fret);
}
void
gst_ipc_pipeline_comm_cancel (GstIpcPipelineComm * comm, gboolean cleanup)
{
g_mutex_lock (&comm->mutex);
g_hash_table_foreach (comm->waiting_ids, cancel_request_error, comm);
if (cleanup) {
g_hash_table_unref (comm->waiting_ids);
comm->waiting_ids =
g_hash_table_new_full (g_direct_hash, g_direct_equal, NULL,
(GDestroyNotify) comm_request_free);
}
g_mutex_unlock (&comm->mutex);
}
static gboolean
set_field (GQuark field_id, const GValue * value, gpointer user_data)
{
GstStructure *structure = user_data;
gst_structure_id_set_value (structure, field_id, value);
return TRUE;
}
static gboolean
gst_ipc_pipeline_comm_reply_request (GstIpcPipelineComm * comm, guint32 id,
GstFlowReturn ret, GstQuery * query)
{
CommRequest *req;
req = g_hash_table_lookup (comm->waiting_ids, GINT_TO_POINTER (id));
if (!req) {
GST_WARNING_OBJECT (comm->element, "Got reply for unknown request %u", id);
return FALSE;
}
GST_TRACE_OBJECT (comm->element, "Got reply %d (%s) for request %u", ret,
comm_request_ret_get_name (req->type, ret), req->id);
req->replied = TRUE;
req->ret = ret;
if (query) {
if (req->query) {
/* We need to update the original query in place, as the caller
will expect the object to be the same */
GstStructure *structure = gst_query_writable_structure (req->query);
gst_structure_remove_all_fields (structure);
gst_structure_foreach (gst_query_get_structure (query), set_field,
structure);
} else {
GST_WARNING_OBJECT (comm->element,
"Got query reply, but no query was in the request");
}
}
g_cond_signal (&req->cond);
return TRUE;
}
static gint
update_adapter (GstIpcPipelineComm * comm)
{
GstMemory *mem = NULL;
GstBuffer *buf;
GstMapInfo map;
ssize_t sz;
gint ret = 0;
again:
/* update pollFDin if necessary (fdin changed or we lost our parent).
* we do not allow a parent-less element to communicate with its peer
* in order to avoid race conditions where the slave tries to change
* the state of its parent pipeline while it is not yet added in that
* pipeline. */
if (comm->pollFDin.fd != comm->fdin || !GST_OBJECT_PARENT (comm->element)) {
if (comm->pollFDin.fd != -1) {
GST_DEBUG_OBJECT (comm->element, "Stop watching fd %d",
comm->pollFDin.fd);
gst_poll_remove_fd (comm->poll, &comm->pollFDin);
gst_poll_fd_init (&comm->pollFDin);
}
if (comm->fdin != -1 && GST_OBJECT_PARENT (comm->element)) {
GST_DEBUG_OBJECT (comm->element, "Start watching fd %d", comm->fdin);
comm->pollFDin.fd = comm->fdin;
gst_poll_add_fd (comm->poll, &comm->pollFDin);
gst_poll_fd_ctl_read (comm->poll, &comm->pollFDin, TRUE);
}
}
/* wait for activity on fdin or a flush */
if (gst_poll_wait (comm->poll, 100 * GST_MSECOND) < 0) {
if (errno == EAGAIN)
goto again;
/* error out, unless interrupted or flushing */
if (errno != EINTR)
ret = (errno == EBUSY) ? 2 : 1;
}
/* read from fdin if possible and push data to our adapter */
if (comm->pollFDin.fd >= 0
&& gst_poll_fd_can_read (comm->poll, &comm->pollFDin)) {
if (!mem)
mem = gst_allocator_alloc (NULL, comm->read_chunk_size, NULL);
gst_memory_map (mem, &map, GST_MAP_WRITE);
sz = read (comm->pollFDin.fd, map.data, map.size);
gst_memory_unmap (mem, &map);
if (sz <= 0) {
if (errno == EAGAIN)
goto again;
/* error out, unless interrupted */
if (errno != EINTR)
ret = 1;
} else {
gst_memory_resize (mem, 0, sz);
buf = gst_buffer_new ();
gst_buffer_append_memory (buf, mem);
mem = NULL;
GST_TRACE_OBJECT (comm->element, "Read %u bytes from fd", (unsigned) sz);
gst_adapter_push (comm->adapter, buf);
}
}
if (mem)
gst_memory_unref (mem);
return ret;
}
static gboolean
read_many (GstIpcPipelineComm * comm)
{
gboolean ret = TRUE;
gsize available;
const guint8 *payload;
while (1)
switch (comm->state) {
case GST_IPC_PIPELINE_COMM_STATE_TYPE:
{
guint8 type;
guint32 mapped_size;
available = gst_adapter_available (comm->adapter);
mapped_size = 1 + sizeof (gint32) * 2;
if (available < mapped_size)
goto done;
payload = gst_adapter_map (comm->adapter, mapped_size);
type = *payload++;
g_mutex_lock (&comm->mutex);
memcpy (&comm->id, payload, sizeof (guint32));
memcpy (&comm->payload_length, payload + 4, sizeof (guint32));
g_mutex_unlock (&comm->mutex);
gst_adapter_unmap (comm->adapter);
gst_adapter_flush (comm->adapter, mapped_size);
GST_TRACE_OBJECT (comm->element, "Got id %u, type %d, payload %u",
comm->id, type, comm->payload_length);
switch (type) {
case GST_IPC_PIPELINE_COMM_DATA_TYPE_ACK:
case GST_IPC_PIPELINE_COMM_DATA_TYPE_QUERY_RESULT:
case GST_IPC_PIPELINE_COMM_DATA_TYPE_BUFFER:
case GST_IPC_PIPELINE_COMM_DATA_TYPE_EVENT:
case GST_IPC_PIPELINE_COMM_DATA_TYPE_SINK_MESSAGE_EVENT:
case GST_IPC_PIPELINE_COMM_DATA_TYPE_QUERY:
case GST_IPC_PIPELINE_COMM_DATA_TYPE_STATE_CHANGE:
case GST_IPC_PIPELINE_COMM_DATA_TYPE_STATE_LOST:
case GST_IPC_PIPELINE_COMM_DATA_TYPE_MESSAGE:
case GST_IPC_PIPELINE_COMM_DATA_TYPE_GERROR_MESSAGE:
GST_TRACE_OBJECT (comm->element, "switching to state %s",
gst_ipc_pipeline_comm_data_type_get_name (type));
comm->state = type;
break;
default:
goto out_of_sync;
}
break;
}
case GST_IPC_PIPELINE_COMM_DATA_TYPE_ACK:
{
const guint8 *rets;
guint32 ret32;
available = gst_adapter_available (comm->adapter);
if (available < comm->payload_length)
goto done;
if (available < sizeof (guint32))
goto ack_failed;
rets = gst_adapter_map (comm->adapter, sizeof (guint32));
memcpy (&ret32, rets, sizeof (ret32));
gst_adapter_unmap (comm->adapter);
gst_adapter_flush (comm->adapter, sizeof (guint32));
GST_TRACE_OBJECT (comm->element, "Got ACK %s for id %u",
gst_flow_get_name (ret32), comm->id);
g_mutex_lock (&comm->mutex);
gst_ipc_pipeline_comm_reply_request (comm, comm->id, ret32, NULL);
g_mutex_unlock (&comm->mutex);
GST_TRACE_OBJECT (comm->element, "switching to state TYPE");
comm->state = GST_IPC_PIPELINE_COMM_STATE_TYPE;
break;
}
case GST_IPC_PIPELINE_COMM_DATA_TYPE_QUERY_RESULT:
{
GstQuery *query = NULL;
gboolean qret;
available = gst_adapter_available (comm->adapter);
if (available < comm->payload_length)
goto done;
qret =
gst_ipc_pipeline_comm_read_query_result (comm, comm->payload_length,
&query);
GST_TRACE_OBJECT (comm->element,
"deserialized query result %p: %d, %" GST_PTR_FORMAT, query, qret,
query);
g_mutex_lock (&comm->mutex);
gst_ipc_pipeline_comm_reply_request (comm, comm->id, qret, query);
g_mutex_unlock (&comm->mutex);
gst_query_unref (query);
GST_TRACE_OBJECT (comm->element, "switching to state TYPE");
comm->state = GST_IPC_PIPELINE_COMM_STATE_TYPE;
break;
}
case GST_IPC_PIPELINE_COMM_DATA_TYPE_BUFFER:
{
GstBuffer *buf;
available = gst_adapter_available (comm->adapter);
if (available < comm->payload_length)
goto done;
buf = gst_ipc_pipeline_comm_read_buffer (comm, comm->payload_length);
if (!buf)
goto buffer_failed;
/* set caps and push */
GST_TRACE_OBJECT (comm->element,
"deserialized buffer %p, pushing, timestamp %" GST_TIME_FORMAT
", duration %" GST_TIME_FORMAT ", offset %" G_GINT64_FORMAT
", offset_end %" G_GINT64_FORMAT ", size %" G_GSIZE_FORMAT
", flags 0x%x", buf, GST_TIME_ARGS (GST_BUFFER_TIMESTAMP (buf)),
GST_TIME_ARGS (GST_BUFFER_DURATION (buf)), GST_BUFFER_OFFSET (buf),
GST_BUFFER_OFFSET_END (buf), gst_buffer_get_size (buf),
GST_BUFFER_FLAGS (buf));
gst_mini_object_set_qdata (GST_MINI_OBJECT (buf), QUARK_ID,
GINT_TO_POINTER (comm->id), NULL);
if (comm->on_buffer)
(*comm->on_buffer) (comm->id, buf, comm->user_data);
GST_TRACE_OBJECT (comm->element, "switching to state TYPE");
comm->state = GST_IPC_PIPELINE_COMM_STATE_TYPE;
break;
}
case GST_IPC_PIPELINE_COMM_DATA_TYPE_EVENT:
{
GstEvent *event;
gboolean upstream;
available = gst_adapter_available (comm->adapter);
if (available < comm->payload_length)
goto done;
event = gst_ipc_pipeline_comm_read_event (comm, comm->payload_length,
&upstream);
if (!event)
goto event_failed;
GST_TRACE_OBJECT (comm->element, "deserialized event %p of type %s",
event, gst_event_type_get_name (event->type));
gst_mini_object_set_qdata (GST_MINI_OBJECT (event), QUARK_ID,
GINT_TO_POINTER (comm->id), NULL);
if (comm->on_event)
(*comm->on_event) (comm->id, event, upstream, comm->user_data);
GST_TRACE_OBJECT (comm->element, "switching to state TYPE");
comm->state = GST_IPC_PIPELINE_COMM_STATE_TYPE;
break;
}
case GST_IPC_PIPELINE_COMM_DATA_TYPE_SINK_MESSAGE_EVENT:
{
GstEvent *event;
available = gst_adapter_available (comm->adapter);
if (available < comm->payload_length)
goto done;
event = gst_ipc_pipeline_comm_read_sink_message_event (comm,
comm->payload_length);
if (!event)
goto event_failed;
GST_TRACE_OBJECT (comm->element, "deserialized sink message event %p",
event);
gst_mini_object_set_qdata (GST_MINI_OBJECT (event), QUARK_ID,
GINT_TO_POINTER (comm->id), NULL);
if (comm->on_event)
(*comm->on_event) (comm->id, event, FALSE, comm->user_data);
GST_TRACE_OBJECT (comm->element, "switching to state TYPE");
comm->state = GST_IPC_PIPELINE_COMM_STATE_TYPE;
break;
}
case GST_IPC_PIPELINE_COMM_DATA_TYPE_QUERY:
{
GstQuery *query;
gboolean upstream;
available = gst_adapter_available (comm->adapter);
if (available < comm->payload_length)
goto done;
query = gst_ipc_pipeline_comm_read_query (comm, comm->payload_length,
&upstream);
if (!query)
goto query_failed;
GST_TRACE_OBJECT (comm->element, "deserialized query %p of type %s",
query, gst_query_type_get_name (query->type));
gst_mini_object_set_qdata (GST_MINI_OBJECT (query), QUARK_ID,
GINT_TO_POINTER (comm->id), NULL);
if (comm->on_query)
(*comm->on_query) (comm->id, query, upstream, comm->user_data);
GST_TRACE_OBJECT (comm->element, "switching to state TYPE");
comm->state = GST_IPC_PIPELINE_COMM_STATE_TYPE;
break;
}
case GST_IPC_PIPELINE_COMM_DATA_TYPE_STATE_CHANGE:
{
guint32 transition;
available = gst_adapter_available (comm->adapter);
if (available < comm->payload_length)
goto done;
if (!gst_ipc_pipeline_comm_read_state_change (comm,
comm->payload_length, &transition))
goto state_change_failed;
GST_TRACE_OBJECT (comm->element,
"deserialized state change request: %s -> %s",
gst_element_state_get_name (GST_STATE_TRANSITION_CURRENT
(transition)),
gst_element_state_get_name (GST_STATE_TRANSITION_NEXT
(transition)));
if (comm->on_state_change)
(*comm->on_state_change) (comm->id, transition, comm->user_data);
GST_TRACE_OBJECT (comm->element, "switching to state TYPE");
comm->state = GST_IPC_PIPELINE_COMM_STATE_TYPE;
break;
}
case GST_IPC_PIPELINE_COMM_DATA_TYPE_STATE_LOST:
{
available = gst_adapter_available (comm->adapter);
if (available < comm->payload_length)
goto done;
if (!gst_ipc_pipeline_comm_read_state_lost (comm, comm->payload_length))
goto event_failed;
GST_TRACE_OBJECT (comm->element, "deserialized state-lost");
if (comm->on_state_lost)
(*comm->on_state_lost) (comm->user_data);
GST_TRACE_OBJECT (comm->element, "switching to state TYPE");
comm->state = GST_IPC_PIPELINE_COMM_STATE_TYPE;
break;
}
case GST_IPC_PIPELINE_COMM_DATA_TYPE_MESSAGE:
{
GstMessage *message;
available = gst_adapter_available (comm->adapter);
if (available < comm->payload_length)
goto done;
message = gst_ipc_pipeline_comm_read_message (comm,
comm->payload_length);
if (!message)
goto message_failed;
GST_TRACE_OBJECT (comm->element, "deserialized message %p of type %s",
message, gst_message_type_get_name (message->type));
if (comm->on_message)
(*comm->on_message) (comm->id, message, comm->user_data);
GST_TRACE_OBJECT (comm->element, "switching to state TYPE");
comm->state = GST_IPC_PIPELINE_COMM_STATE_TYPE;
break;
}
case GST_IPC_PIPELINE_COMM_DATA_TYPE_GERROR_MESSAGE:
{
GstMessage *message;
available = gst_adapter_available (comm->adapter);
if (available < comm->payload_length)
goto done;
message = gst_ipc_pipeline_comm_read_gerror_message (comm,
comm->payload_length);
if (!message)
goto message_failed;
GST_TRACE_OBJECT (comm->element, "deserialized message %p of type %s",
message, gst_message_type_get_name (message->type));
if (comm->on_message)
(*comm->on_message) (comm->id, message, comm->user_data);
GST_TRACE_OBJECT (comm->element, "switching to state TYPE");
comm->state = GST_IPC_PIPELINE_COMM_STATE_TYPE;
break;
}
}
done:
return ret;
/* ERRORS */
out_of_sync:
{
GST_ELEMENT_ERROR (comm->element, STREAM, DECODE, (NULL),
("Socket out of sync"));
ret = FALSE;
goto done;
}
state_change_failed:
{
GST_ELEMENT_ERROR (comm->element, STREAM, DECODE, (NULL),
("could not read state change from fd"));
ret = FALSE;
goto done;
}
ack_failed:
{
GST_ELEMENT_ERROR (comm->element, STREAM, DECODE, (NULL),
("could not read ack from fd"));
ret = FALSE;
goto done;
}
buffer_failed:
{
GST_ELEMENT_ERROR (comm->element, STREAM, DECODE, (NULL),
("could not read buffer from fd"));
ret = FALSE;
goto done;
}
event_failed:
{
GST_ELEMENT_ERROR (comm->element, STREAM, DECODE, (NULL),
("could not read event from fd"));
ret = FALSE;
goto done;
}
message_failed:
{
GST_ELEMENT_ERROR (comm->element, STREAM, DECODE, (NULL),
("could not read message from fd"));
ret = FALSE;
goto done;
}
query_failed:
{
GST_ELEMENT_ERROR (comm->element, STREAM, DECODE, (NULL),
("could not read query from fd"));
ret = FALSE;
goto done;
}
}
static gpointer
reader_thread (gpointer data)
{
GstIpcPipelineComm *comm = (GstIpcPipelineComm *) data;
gboolean running = TRUE;
gint ret = 0;
while (running) {
ret = update_adapter (comm);
switch (ret) {
case 1:
GST_ELEMENT_ERROR (comm->element, RESOURCE, READ, (NULL),
("Failed to read from socket"));
running = FALSE;
break;
case 2:
GST_INFO_OBJECT (comm->element, "We're stopping, all good");
running = FALSE;
break;
default:
read_many (comm);
break;
}
}
GST_INFO_OBJECT (comm->element, "Reader thread ending");
return NULL;
}
gboolean
gst_ipc_pipeline_comm_start_reader_thread (GstIpcPipelineComm * comm,
void (*on_buffer) (guint32, GstBuffer *, gpointer),
void (*on_event) (guint32, GstEvent *, gboolean, gpointer),
void (*on_query) (guint32, GstQuery *, gboolean, gpointer),
void (*on_state_change) (guint32, GstStateChange, gpointer),
void (*on_state_lost) (gpointer),
void (*on_message) (guint32, GstMessage *, gpointer), gpointer user_data)
{
if (comm->reader_thread)
return FALSE;
comm->state = GST_IPC_PIPELINE_COMM_STATE_TYPE;
comm->on_buffer = on_buffer;
comm->on_event = on_event;
comm->on_query = on_query;
comm->on_state_change = on_state_change;
comm->on_state_lost = on_state_lost;
comm->on_message = on_message;
comm->user_data = user_data;
gst_poll_set_flushing (comm->poll, FALSE);
comm->reader_thread =
g_thread_new ("reader", (GThreadFunc) reader_thread, comm);
return TRUE;
}
void
gst_ipc_pipeline_comm_stop_reader_thread (GstIpcPipelineComm * comm)
{
if (!comm->reader_thread)
return;
gst_poll_set_flushing (comm->poll, TRUE);
g_thread_join (comm->reader_thread);
comm->reader_thread = NULL;
}
static gchar *
gst_value_serialize_event (const GValue * value)
{
const GstStructure *structure;
GstEvent *ev;
gchar *type, *ts, *seqnum, *rt_offset, *str, *str64, *s;
GValue val = G_VALUE_INIT;
ev = g_value_get_boxed (value);
g_value_init (&val, gst_event_type_get_type ());
g_value_set_enum (&val, ev->type);
type = gst_value_serialize (&val);
g_value_unset (&val);
g_value_init (&val, G_TYPE_UINT64);
g_value_set_uint64 (&val, ev->timestamp);
ts = gst_value_serialize (&val);
g_value_unset (&val);
g_value_init (&val, G_TYPE_UINT);
g_value_set_uint (&val, ev->seqnum);
seqnum = gst_value_serialize (&val);
g_value_unset (&val);
g_value_init (&val, G_TYPE_INT64);
g_value_set_int64 (&val, gst_event_get_running_time_offset (ev));
rt_offset = gst_value_serialize (&val);
g_value_unset (&val);
structure = gst_event_get_structure (ev);
str = gst_structure_to_string (structure);
str64 = g_base64_encode ((guchar *) str, strlen (str) + 1);
g_strdelimit (str64, "=", '_');
g_free (str);
s = g_strconcat (type, ":", ts, ":", seqnum, ":", rt_offset, ":", str64,
NULL);
g_free (type);
g_free (ts);
g_free (seqnum);
g_free (rt_offset);
g_free (str64);
return s;
}
static gboolean
gst_value_deserialize_event (GValue * dest, const gchar * s)
{
GstEvent *ev = NULL;
GValue val = G_VALUE_INIT;
gboolean ret = FALSE;
gchar **fields;
gsize len;
fields = g_strsplit (s, ":", -1);
if (g_strv_length (fields) != 5)
goto wrong_length;
g_strdelimit (fields[4], "_", '=');
g_base64_decode_inplace (fields[4], &len);
g_value_init (&val, gst_event_type_get_type ());
if (!gst_value_deserialize (&val, fields[0]))
goto fail;
ev = gst_event_new_custom (g_value_get_enum (&val),
gst_structure_new_from_string (fields[4]));
g_value_unset (&val);
g_value_init (&val, G_TYPE_UINT64);
if (!gst_value_deserialize (&val, fields[1]))
goto fail;
ev->timestamp = g_value_get_uint64 (&val);
g_value_unset (&val);
g_value_init (&val, G_TYPE_UINT);
if (!gst_value_deserialize (&val, fields[2]))
goto fail;
ev->seqnum = g_value_get_uint (&val);
g_value_unset (&val);
g_value_init (&val, G_TYPE_INT64);
if (!gst_value_deserialize (&val, fields[3]))
goto fail;
gst_event_set_running_time_offset (ev, g_value_get_int64 (&val));
g_value_take_boxed (dest, ev);
ev = NULL;
ret = TRUE;
fail:
g_clear_pointer (&ev, gst_event_unref);
g_value_unset (&val);
wrong_length:
g_strfreev (fields);
return ret;
}
#define REGISTER_SERIALIZATION_NO_COMPARE(_gtype, _type) \
G_STMT_START { \
static GstValueTable gst_value = \
{ 0, NULL, \
gst_value_serialize_ ## _type, gst_value_deserialize_ ## _type }; \
gst_value.type = _gtype; \
gst_value_register (&gst_value); \
} G_STMT_END
void
gst_ipc_pipeline_comm_plugin_init (void)
{
static gsize once = 0;
if (g_once_init_enter (&once)) {
GST_DEBUG_CATEGORY_INIT (gst_ipc_pipeline_comm_debug, "ipcpipelinecomm", 0,
"ipc pipeline comm");
QUARK_ID = g_quark_from_static_string ("ipcpipeline-id");
REGISTER_SERIALIZATION_NO_COMPARE (gst_event_get_type (), event);
g_once_init_leave (&once, (gsize) 1);
}
}
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