gstreamer/plugins/elements/gstfdsink.c
2020-12-10 12:45:16 +01:00

641 lines
16 KiB
C

/* GStreamer
* Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
* 2000 Wim Taymans <wtay@chello.be>
*
* gstfdsink.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.
*/
/**
* SECTION:element-fdsink
* @title: fdsink
* @see_also: #GstFdSrc
*
* Write data to a unix file descriptor.
*
* This element will synchronize on the clock before writing the data on the
* socket. For file descriptors where this does not make sense (files, ...) the
* #GstBaseSink:sync property can be used to disable synchronisation.
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include "../../gst/gst-i18n-lib.h"
#include <sys/types.h>
#include <sys/stat.h>
#ifdef HAVE_SYS_SOCKET_H
#include <sys/socket.h>
#endif
#include <fcntl.h>
#include <stdio.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#ifdef _MSC_VER
#undef stat
#define stat _stat
#define fstat _fstat
#define S_ISREG(m) (((m)&S_IFREG)==S_IFREG)
#endif
#include <errno.h>
#include <string.h>
#include "gstfdsink.h"
#include "gstelements_private.h"
#include "gstcoreelementselements.h"
#ifdef G_OS_WIN32
#include <io.h> /* lseek, open, close, read */
#undef lseek
#define lseek _lseeki64
#undef off_t
#define off_t guint64
#endif
#define struct_stat struct stat
#if defined(__BIONIC__) /* Android */
#if defined(__ANDROID_API__) && __ANDROID_API__ >= 21
#undef fstat
#define fstat fstat64
#undef struct_stat
#define struct_stat struct stat64
#endif
#endif
static GstStaticPadTemplate sinktemplate = GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS_ANY);
GST_DEBUG_CATEGORY_STATIC (gst_fd_sink__debug);
#define GST_CAT_DEFAULT gst_fd_sink__debug
/* FdSink signals and args */
enum
{
/* FILL ME */
LAST_SIGNAL
};
enum
{
ARG_0,
ARG_FD
};
static void gst_fd_sink_uri_handler_init (gpointer g_iface,
gpointer iface_data);
#define _do_init \
G_IMPLEMENT_INTERFACE (GST_TYPE_URI_HANDLER, gst_fd_sink_uri_handler_init); \
GST_DEBUG_CATEGORY_INIT (gst_fd_sink__debug, "fdsink", 0, "fdsink element");
#define gst_fd_sink_parent_class parent_class
G_DEFINE_TYPE_WITH_CODE (GstFdSink, gst_fd_sink, GST_TYPE_BASE_SINK, _do_init);
#if defined(HAVE_SYS_SOCKET_H) || defined(_MSC_VER)
GST_ELEMENT_REGISTER_DEFINE (fdsink, "fdsink", GST_RANK_NONE, GST_TYPE_FD_SINK);
#endif
static void gst_fd_sink_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec);
static void gst_fd_sink_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec);
static void gst_fd_sink_dispose (GObject * obj);
static gboolean gst_fd_sink_query (GstBaseSink * bsink, GstQuery * query);
static GstFlowReturn gst_fd_sink_render (GstBaseSink * sink,
GstBuffer * buffer);
static GstFlowReturn gst_fd_sink_render_list (GstBaseSink * bsink,
GstBufferList * buffer_list);
static gboolean gst_fd_sink_start (GstBaseSink * basesink);
static gboolean gst_fd_sink_stop (GstBaseSink * basesink);
static gboolean gst_fd_sink_unlock (GstBaseSink * basesink);
static gboolean gst_fd_sink_unlock_stop (GstBaseSink * basesink);
static gboolean gst_fd_sink_event (GstBaseSink * sink, GstEvent * event);
static gboolean gst_fd_sink_do_seek (GstFdSink * fdsink, guint64 new_offset);
static void
gst_fd_sink_class_init (GstFdSinkClass * klass)
{
GObjectClass *gobject_class;
GstElementClass *gstelement_class;
GstBaseSinkClass *gstbasesink_class;
gobject_class = G_OBJECT_CLASS (klass);
gstelement_class = GST_ELEMENT_CLASS (klass);
gstbasesink_class = GST_BASE_SINK_CLASS (klass);
gobject_class->set_property = gst_fd_sink_set_property;
gobject_class->get_property = gst_fd_sink_get_property;
gobject_class->dispose = gst_fd_sink_dispose;
gst_element_class_set_static_metadata (gstelement_class,
"Filedescriptor Sink",
"Sink/File",
"Write data to a file descriptor", "Erik Walthinsen <omega@cse.ogi.edu>");
gst_element_class_add_static_pad_template (gstelement_class, &sinktemplate);
gstbasesink_class->render = GST_DEBUG_FUNCPTR (gst_fd_sink_render);
gstbasesink_class->render_list = GST_DEBUG_FUNCPTR (gst_fd_sink_render_list);
gstbasesink_class->start = GST_DEBUG_FUNCPTR (gst_fd_sink_start);
gstbasesink_class->stop = GST_DEBUG_FUNCPTR (gst_fd_sink_stop);
gstbasesink_class->unlock = GST_DEBUG_FUNCPTR (gst_fd_sink_unlock);
gstbasesink_class->unlock_stop = GST_DEBUG_FUNCPTR (gst_fd_sink_unlock_stop);
gstbasesink_class->event = GST_DEBUG_FUNCPTR (gst_fd_sink_event);
gstbasesink_class->query = GST_DEBUG_FUNCPTR (gst_fd_sink_query);
g_object_class_install_property (gobject_class, ARG_FD,
g_param_spec_int ("fd", "fd", "An open file descriptor to write to",
0, G_MAXINT, 1, G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
}
static void
gst_fd_sink_init (GstFdSink * fdsink)
{
fdsink->fd = 1;
fdsink->uri = g_strdup_printf ("fd://%d", fdsink->fd);
fdsink->current_pos = 0;
gst_base_sink_set_sync (GST_BASE_SINK (fdsink), FALSE);
}
static void
gst_fd_sink_dispose (GObject * obj)
{
GstFdSink *fdsink = GST_FD_SINK (obj);
g_free (fdsink->uri);
fdsink->uri = NULL;
G_OBJECT_CLASS (parent_class)->dispose (obj);
}
static gboolean
gst_fd_sink_query (GstBaseSink * bsink, GstQuery * query)
{
gboolean res = FALSE;
GstFdSink *fdsink;
fdsink = GST_FD_SINK (bsink);
switch (GST_QUERY_TYPE (query)) {
case GST_QUERY_POSITION:
{
GstFormat format;
gst_query_parse_position (query, &format, NULL);
switch (format) {
case GST_FORMAT_DEFAULT:
case GST_FORMAT_BYTES:
gst_query_set_position (query, GST_FORMAT_BYTES, fdsink->current_pos);
res = TRUE;
break;
default:
break;
}
break;
}
case GST_QUERY_FORMATS:
gst_query_set_formats (query, 2, GST_FORMAT_DEFAULT, GST_FORMAT_BYTES);
res = TRUE;
break;
case GST_QUERY_URI:
gst_query_set_uri (query, fdsink->uri);
res = TRUE;
break;
case GST_QUERY_SEEKING:{
GstFormat format;
gst_query_parse_seeking (query, &format, NULL, NULL, NULL);
if (format == GST_FORMAT_BYTES || format == GST_FORMAT_DEFAULT) {
gst_query_set_seeking (query, GST_FORMAT_BYTES, fdsink->seekable, 0,
-1);
} else {
gst_query_set_seeking (query, format, FALSE, 0, -1);
}
res = TRUE;
break;
}
default:
res = GST_BASE_SINK_CLASS (parent_class)->query (bsink, query);
break;
}
return res;
}
static GstFlowReturn
gst_fd_sink_render_list (GstBaseSink * bsink, GstBufferList * buffer_list)
{
GstFdSink *sink;
GstFlowReturn ret;
guint64 skip = 0;
guint num_buffers;
sink = GST_FD_SINK_CAST (bsink);
num_buffers = gst_buffer_list_length (buffer_list);
if (num_buffers == 0)
goto no_data;
for (;;) {
guint64 bytes_written = 0;
ret = gst_writev_buffer_list (GST_OBJECT_CAST (sink), sink->fd, sink->fdset,
buffer_list, &bytes_written, skip, 0, -1, NULL);
sink->current_pos += bytes_written;
skip += bytes_written;
if (!sink->unlock || ret != GST_FLOW_FLUSHING)
break;
ret = gst_base_sink_wait_preroll (GST_BASE_SINK (sink));
if (ret != GST_FLOW_OK)
return ret;
}
return ret;
no_data:
{
GST_LOG_OBJECT (sink, "empty buffer list");
return GST_FLOW_OK;
}
}
static GstFlowReturn
gst_fd_sink_render (GstBaseSink * bsink, GstBuffer * buffer)
{
GstFdSink *sink;
GstFlowReturn ret;
guint64 skip = 0;
sink = GST_FD_SINK_CAST (bsink);
for (;;) {
guint64 bytes_written = 0;
ret = gst_writev_buffer (GST_OBJECT_CAST (sink), sink->fd, sink->fdset,
buffer, &bytes_written, skip, 0, -1, NULL);
sink->current_pos += bytes_written;
skip += bytes_written;
if (!sink->unlock || ret != GST_FLOW_FLUSHING)
break;
ret = gst_base_sink_wait_preroll (GST_BASE_SINK (sink));
if (ret != GST_FLOW_OK)
return ret;
}
return ret;
}
static gboolean
gst_fd_sink_check_fd (GstFdSink * fdsink, int fd, GError ** error)
{
struct_stat stat_results;
off_t result;
/* see that it is a valid file descriptor */
if (fstat (fd, &stat_results) < 0)
goto invalid;
if (!S_ISREG (stat_results.st_mode))
goto not_seekable;
/* see if it is a seekable stream */
result = lseek (fd, 0, SEEK_CUR);
if (result == -1) {
switch (errno) {
case EINVAL:
case EBADF:
goto invalid;
case ESPIPE:
goto not_seekable;
}
} else
GST_DEBUG_OBJECT (fdsink, "File descriptor %d is seekable", fd);
return TRUE;
invalid:
{
GST_ELEMENT_ERROR (fdsink, RESOURCE, WRITE, (NULL),
("File descriptor %d is not valid: %s", fd, g_strerror (errno)));
g_set_error (error, GST_URI_ERROR, GST_URI_ERROR_BAD_REFERENCE,
"File descriptor %d is not valid: %s", fd, g_strerror (errno));
return FALSE;
}
not_seekable:
{
GST_DEBUG_OBJECT (fdsink, "File descriptor %d is a pipe", fd);
return TRUE;
}
}
static gboolean
gst_fd_sink_start (GstBaseSink * basesink)
{
GstFdSink *fdsink;
GstPollFD fd = GST_POLL_FD_INIT;
fdsink = GST_FD_SINK (basesink);
if (!gst_fd_sink_check_fd (fdsink, fdsink->fd, NULL))
return FALSE;
if ((fdsink->fdset = gst_poll_new (TRUE)) == NULL)
goto socket_pair;
fd.fd = fdsink->fd;
gst_poll_add_fd (fdsink->fdset, &fd);
gst_poll_fd_ctl_write (fdsink->fdset, &fd, TRUE);
fdsink->current_pos = 0;
fdsink->seekable = gst_fd_sink_do_seek (fdsink, 0);
GST_INFO_OBJECT (fdsink, "seeking supported: %d", fdsink->seekable);
return TRUE;
/* ERRORS */
socket_pair:
{
GST_ELEMENT_ERROR (fdsink, RESOURCE, OPEN_READ_WRITE, (NULL),
GST_ERROR_SYSTEM);
return FALSE;
}
}
static gboolean
gst_fd_sink_stop (GstBaseSink * basesink)
{
GstFdSink *fdsink = GST_FD_SINK (basesink);
if (fdsink->fdset) {
gst_poll_free (fdsink->fdset);
fdsink->fdset = NULL;
}
return TRUE;
}
static gboolean
gst_fd_sink_unlock (GstBaseSink * basesink)
{
GstFdSink *fdsink = GST_FD_SINK (basesink);
GST_LOG_OBJECT (fdsink, "Flushing");
GST_OBJECT_LOCK (fdsink);
fdsink->unlock = TRUE;
gst_poll_set_flushing (fdsink->fdset, TRUE);
GST_OBJECT_UNLOCK (fdsink);
return TRUE;
}
static gboolean
gst_fd_sink_unlock_stop (GstBaseSink * basesink)
{
GstFdSink *fdsink = GST_FD_SINK (basesink);
GST_LOG_OBJECT (fdsink, "No longer flushing");
GST_OBJECT_LOCK (fdsink);
fdsink->unlock = FALSE;
gst_poll_set_flushing (fdsink->fdset, FALSE);
GST_OBJECT_UNLOCK (fdsink);
return TRUE;
}
static gboolean
gst_fd_sink_update_fd (GstFdSink * fdsink, int new_fd, GError ** error)
{
if (new_fd < 0) {
g_set_error (error, GST_URI_ERROR, GST_URI_ERROR_BAD_REFERENCE,
"File descriptor %d is not valid", new_fd);
return FALSE;
}
if (!gst_fd_sink_check_fd (fdsink, new_fd, error))
goto invalid;
/* assign the fd */
GST_OBJECT_LOCK (fdsink);
if (fdsink->fdset) {
GstPollFD fd = GST_POLL_FD_INIT;
fd.fd = fdsink->fd;
gst_poll_remove_fd (fdsink->fdset, &fd);
fd.fd = new_fd;
gst_poll_add_fd (fdsink->fdset, &fd);
gst_poll_fd_ctl_write (fdsink->fdset, &fd, TRUE);
}
fdsink->fd = new_fd;
g_free (fdsink->uri);
fdsink->uri = g_strdup_printf ("fd://%d", fdsink->fd);
GST_OBJECT_UNLOCK (fdsink);
return TRUE;
invalid:
{
return FALSE;
}
}
static void
gst_fd_sink_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
GstFdSink *fdsink;
fdsink = GST_FD_SINK (object);
switch (prop_id) {
case ARG_FD:{
int fd;
fd = g_value_get_int (value);
gst_fd_sink_update_fd (fdsink, fd, NULL);
break;
}
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_fd_sink_get_property (GObject * object, guint prop_id, GValue * value,
GParamSpec * pspec)
{
GstFdSink *fdsink;
fdsink = GST_FD_SINK (object);
switch (prop_id) {
case ARG_FD:
g_value_set_int (value, fdsink->fd);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static gboolean
gst_fd_sink_do_seek (GstFdSink * fdsink, guint64 new_offset)
{
off_t result;
result = lseek (fdsink->fd, new_offset, SEEK_SET);
if (result == -1)
goto seek_failed;
fdsink->current_pos = new_offset;
GST_DEBUG_OBJECT (fdsink, "File descriptor %d to seek to position "
"%" G_GUINT64_FORMAT, fdsink->fd, fdsink->current_pos);
return TRUE;
/* ERRORS */
seek_failed:
{
GST_DEBUG_OBJECT (fdsink, "File descriptor %d failed to seek to position "
"%" G_GUINT64_FORMAT, fdsink->fd, new_offset);
return FALSE;
}
}
static gboolean
gst_fd_sink_event (GstBaseSink * sink, GstEvent * event)
{
GstEventType type;
GstFdSink *fdsink;
fdsink = GST_FD_SINK (sink);
type = GST_EVENT_TYPE (event);
switch (type) {
case GST_EVENT_SEGMENT:
{
const GstSegment *segment;
gst_event_parse_segment (event, &segment);
if (segment->format == GST_FORMAT_BYTES) {
/* only try to seek and fail when we are going to a different
* position */
if (fdsink->current_pos != segment->start) {
/* FIXME, the seek should be performed on the pos field, start/stop are
* just boundaries for valid bytes offsets. We should also fill the file
* with zeroes if the new position extends the current EOF (sparse streams
* and segment accumulation). */
if (!gst_fd_sink_do_seek (fdsink, (guint64) segment->start))
goto seek_failed;
}
} else {
GST_DEBUG_OBJECT (fdsink,
"Ignored SEGMENT event of format %u (%s)", (guint) segment->format,
gst_format_get_name (segment->format));
}
break;
}
default:
break;
}
return GST_BASE_SINK_CLASS (parent_class)->event (sink, event);
seek_failed:
{
GST_ELEMENT_ERROR (fdsink, RESOURCE, SEEK, (NULL),
("Error while seeking on file descriptor %d: %s",
fdsink->fd, g_strerror (errno)));
gst_event_unref (event);
return FALSE;
}
}
/*** GSTURIHANDLER INTERFACE *************************************************/
static GstURIType
gst_fd_sink_uri_get_type (GType type)
{
return GST_URI_SINK;
}
static const gchar *const *
gst_fd_sink_uri_get_protocols (GType type)
{
static const gchar *protocols[] = { "fd", NULL };
return protocols;
}
static gchar *
gst_fd_sink_uri_get_uri (GstURIHandler * handler)
{
GstFdSink *sink = GST_FD_SINK (handler);
/* FIXME: make thread-safe */
return g_strdup (sink->uri);
}
static gboolean
gst_fd_sink_uri_set_uri (GstURIHandler * handler, const gchar * uri,
GError ** error)
{
GstFdSink *sink = GST_FD_SINK (handler);
gint fd;
if (sscanf (uri, "fd://%d", &fd) != 1) {
g_set_error (error, GST_URI_ERROR, GST_URI_ERROR_BAD_URI,
"File descriptor URI could not be parsed");
return FALSE;
}
return gst_fd_sink_update_fd (sink, fd, error);
}
static void
gst_fd_sink_uri_handler_init (gpointer g_iface, gpointer iface_data)
{
GstURIHandlerInterface *iface = (GstURIHandlerInterface *) g_iface;
iface->get_type = gst_fd_sink_uri_get_type;
iface->get_protocols = gst_fd_sink_uri_get_protocols;
iface->get_uri = gst_fd_sink_uri_get_uri;
iface->set_uri = gst_fd_sink_uri_set_uri;
}