gstreamer/gst-libs/gst/uridownloader/gsturidownloader.c
Thiago Santos c62137b832 uridownloader: fix crash when download is null
Do no try to unref a NULL download attribute
2013-07-08 23:39:49 -03:00

472 lines
14 KiB
C

/* GStreamer
* Copyright (C) 2011 Andoni Morales Alastruey <ylatuya@gmail.com>
*
* gstfragment.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.
*/
#include <glib.h>
#include "gstfragment.h"
#include "gsturidownloader.h"
#include "gsturidownloader_debug.h"
#define GST_CAT_DEFAULT uridownloader_debug
GST_DEBUG_CATEGORY (uridownloader_debug);
#define GST_URI_DOWNLOADER_GET_PRIVATE(obj) \
(G_TYPE_INSTANCE_GET_PRIVATE ((obj), \
GST_TYPE_URI_DOWNLOADER, GstUriDownloaderPrivate))
struct _GstUriDownloaderPrivate
{
/* Fragments fetcher */
GstElement *urisrc;
GstBus *bus;
GstPad *pad;
GTimeVal *timeout;
GstFragment *download;
GMutex download_lock; /* used to restrict to one download only */
GCond cond;
gboolean cancelled;
};
static void gst_uri_downloader_finalize (GObject * object);
static void gst_uri_downloader_dispose (GObject * object);
static GstFlowReturn gst_uri_downloader_chain (GstPad * pad, GstObject * parent,
GstBuffer * buf);
static gboolean gst_uri_downloader_sink_event (GstPad * pad, GstObject * parent,
GstEvent * event);
static GstBusSyncReply gst_uri_downloader_bus_handler (GstBus * bus,
GstMessage * message, gpointer data);
static GstStaticPadTemplate sinkpadtemplate = GST_STATIC_PAD_TEMPLATE ("sink",
GST_PAD_SINK,
GST_PAD_ALWAYS,
GST_STATIC_CAPS_ANY);
#define _do_init \
{ \
GST_DEBUG_CATEGORY_INIT (uridownloader_debug, "uridownloader", 0, "URI downloader"); \
}
G_DEFINE_TYPE_WITH_CODE (GstUriDownloader, gst_uri_downloader, GST_TYPE_OBJECT,
_do_init);
static void
gst_uri_downloader_class_init (GstUriDownloaderClass * klass)
{
GObjectClass *gobject_class;
gobject_class = (GObjectClass *) klass;
g_type_class_add_private (klass, sizeof (GstUriDownloaderPrivate));
gobject_class->dispose = gst_uri_downloader_dispose;
gobject_class->finalize = gst_uri_downloader_finalize;
}
static void
gst_uri_downloader_init (GstUriDownloader * downloader)
{
downloader->priv = GST_URI_DOWNLOADER_GET_PRIVATE (downloader);
/* Initialize the sink pad. This pad will be connected to the src pad of the
* element created with gst_element_make_from_uri and will handle the download */
downloader->priv->pad =
gst_pad_new_from_static_template (&sinkpadtemplate, "sink");
gst_pad_set_chain_function (downloader->priv->pad,
GST_DEBUG_FUNCPTR (gst_uri_downloader_chain));
gst_pad_set_event_function (downloader->priv->pad,
GST_DEBUG_FUNCPTR (gst_uri_downloader_sink_event));
gst_pad_set_element_private (downloader->priv->pad, downloader);
gst_pad_set_active (downloader->priv->pad, TRUE);
/* Create a bus to handle error and warning message from the source element */
downloader->priv->bus = gst_bus_new ();
g_mutex_init (&downloader->priv->download_lock);
g_cond_init (&downloader->priv->cond);
}
static void
gst_uri_downloader_dispose (GObject * object)
{
GstUriDownloader *downloader = GST_URI_DOWNLOADER (object);
if (downloader->priv->urisrc != NULL) {
gst_object_unref (downloader->priv->urisrc);
downloader->priv->urisrc = NULL;
}
if (downloader->priv->bus != NULL) {
gst_object_unref (downloader->priv->bus);
downloader->priv->bus = NULL;
}
if (downloader->priv->pad) {
gst_object_unref (downloader->priv->pad);
downloader->priv->pad = NULL;
}
if (downloader->priv->download) {
g_object_unref (downloader->priv->download);
downloader->priv->download = NULL;
}
G_OBJECT_CLASS (gst_uri_downloader_parent_class)->dispose (object);
}
static void
gst_uri_downloader_finalize (GObject * object)
{
GstUriDownloader *downloader = GST_URI_DOWNLOADER (object);
g_mutex_clear (&downloader->priv->download_lock);
g_cond_clear (&downloader->priv->cond);
G_OBJECT_CLASS (gst_uri_downloader_parent_class)->finalize (object);
}
GstUriDownloader *
gst_uri_downloader_new (void)
{
return g_object_new (GST_TYPE_URI_DOWNLOADER, NULL);
}
static gboolean
gst_uri_downloader_sink_event (GstPad * pad, GstObject * parent,
GstEvent * event)
{
gboolean ret = FALSE;
GstUriDownloader *downloader;
downloader = GST_URI_DOWNLOADER (gst_pad_get_element_private (pad));
switch (event->type) {
case GST_EVENT_EOS:{
GST_OBJECT_LOCK (downloader);
GST_DEBUG_OBJECT (downloader, "Got EOS on the fetcher pad");
if (downloader->priv->download != NULL) {
/* signal we have fetched the URI */
downloader->priv->download->completed = TRUE;
downloader->priv->download->download_stop_time =
gst_util_get_timestamp ();
GST_DEBUG_OBJECT (downloader, "Signaling chain funtion");
g_cond_signal (&downloader->priv->cond);
}
GST_OBJECT_UNLOCK (downloader);
gst_event_unref (event);
break;
}
default:
ret = gst_pad_event_default (pad, parent, event);
break;
}
return ret;
}
static GstBusSyncReply
gst_uri_downloader_bus_handler (GstBus * bus,
GstMessage * message, gpointer data)
{
GstUriDownloader *downloader = (GstUriDownloader *) (data);
if (GST_MESSAGE_TYPE (message) == GST_MESSAGE_ERROR ||
GST_MESSAGE_TYPE (message) == GST_MESSAGE_WARNING) {
GError *err = NULL;
gchar *dbg_info = NULL;
gst_message_parse_error (message, &err, &dbg_info);
GST_WARNING_OBJECT (downloader,
"Received error: %s from %s, the download will be cancelled",
GST_OBJECT_NAME (message->src), err->message);
GST_DEBUG ("Debugging info: %s\n", (dbg_info) ? dbg_info : "none");
g_error_free (err);
g_free (dbg_info);
/* remove the sync handler to avoid duplicated messages */
gst_bus_set_sync_handler (downloader->priv->bus, NULL, NULL, NULL);
/* stop the download */
GST_OBJECT_LOCK (downloader);
if (downloader->priv->download != NULL) {
GST_DEBUG_OBJECT (downloader, "Stopping download");
g_object_unref (downloader->priv->download);
downloader->priv->download = NULL;
g_cond_signal (&downloader->priv->cond);
}
GST_OBJECT_UNLOCK (downloader);
}
gst_message_unref (message);
return GST_BUS_DROP;
}
static GstFlowReturn
gst_uri_downloader_chain (GstPad * pad, GstObject * parent, GstBuffer * buf)
{
GstUriDownloader *downloader;
downloader = GST_URI_DOWNLOADER (gst_pad_get_element_private (pad));
/* HTML errors (404, 500, etc...) are also pushed through this pad as
* response but the source element will also post a warning or error message
* in the bus, which is handled synchronously cancelling the download.
*/
GST_OBJECT_LOCK (downloader);
if (downloader->priv->download == NULL) {
/* Download cancelled, quit */
GST_OBJECT_UNLOCK (downloader);
goto done;
}
GST_LOG_OBJECT (downloader, "The uri fetcher received a new buffer "
"of size %" G_GSIZE_FORMAT, gst_buffer_get_size (buf));
if (!gst_fragment_add_buffer (downloader->priv->download, buf))
GST_WARNING_OBJECT (downloader, "Could not add buffer to fragment");
GST_OBJECT_UNLOCK (downloader);
done:
{
return GST_FLOW_OK;
}
}
/* Must be called with mutex locked. */
static void
gst_uri_downloader_stop (GstUriDownloader * downloader)
{
GstPad *pad;
GstElement *urisrc;
if (!downloader->priv->urisrc)
return;
GST_DEBUG_OBJECT (downloader, "Stopping source element %s",
GST_ELEMENT_NAME (downloader->priv->urisrc));
/* remove the bus' sync handler */
gst_bus_set_sync_handler (downloader->priv->bus, NULL, NULL, NULL);
/* unlink the source element from the internal pad */
pad = gst_pad_get_peer (downloader->priv->pad);
if (pad) {
gst_pad_unlink (pad, downloader->priv->pad);
gst_object_unref (pad);
}
urisrc = downloader->priv->urisrc;
downloader->priv->urisrc = NULL;
GST_DEBUG_OBJECT (downloader, "Stopping source element %s",
GST_ELEMENT_NAME (urisrc));
/* set the element state to NULL */
gst_bus_set_flushing (downloader->priv->bus, TRUE);
gst_element_set_state (urisrc, GST_STATE_NULL);
gst_element_get_state (urisrc, NULL, NULL, GST_CLOCK_TIME_NONE);
gst_element_set_bus (urisrc, NULL);
gst_object_unref (urisrc);
}
void
gst_uri_downloader_reset (GstUriDownloader * downloader)
{
g_return_if_fail (downloader != NULL);
GST_OBJECT_LOCK (downloader);
downloader->priv->cancelled = FALSE;
GST_OBJECT_UNLOCK (downloader);
}
void
gst_uri_downloader_cancel (GstUriDownloader * downloader)
{
GST_OBJECT_LOCK (downloader);
if (downloader->priv->download != NULL) {
GST_DEBUG_OBJECT (downloader, "Cancelling download");
g_object_unref (downloader->priv->download);
downloader->priv->download = NULL;
downloader->priv->cancelled = TRUE;
GST_DEBUG_OBJECT (downloader, "Signaling chain funtion");
g_cond_signal (&downloader->priv->cond);
} else {
gboolean cancelled;
cancelled = downloader->priv->cancelled;
downloader->priv->cancelled = TRUE;
if (cancelled)
GST_DEBUG_OBJECT (downloader,
"Trying to cancel a download that was alredy cancelled");
}
GST_OBJECT_UNLOCK (downloader);
}
static gboolean
gst_uri_downloader_set_range (GstUriDownloader * downloader,
gint64 range_start, gint64 range_end)
{
g_return_val_if_fail (range_start >= 0, FALSE);
g_return_val_if_fail (range_end >= -1, FALSE);
if (range_start || (range_end >= 0)) {
GstEvent *seek;
seek = gst_event_new_seek (1.0, GST_FORMAT_BYTES, GST_SEEK_FLAG_FLUSH,
GST_SEEK_TYPE_SET, range_start, GST_SEEK_TYPE_SET, range_end);
return gst_element_send_event (downloader->priv->urisrc, seek);
}
return TRUE;
}
static gboolean
gst_uri_downloader_set_uri (GstUriDownloader * downloader, const gchar * uri)
{
GstPad *pad;
if (!gst_uri_is_valid (uri))
return FALSE;
g_assert (downloader->priv->urisrc == NULL);
GST_DEBUG_OBJECT (downloader, "Creating source element for the URI:%s", uri);
downloader->priv->urisrc =
gst_element_make_from_uri (GST_URI_SRC, uri, NULL, NULL);
if (!downloader->priv->urisrc)
return FALSE;
/* add a sync handler for the bus messages to detect errors in the download */
gst_element_set_bus (GST_ELEMENT (downloader->priv->urisrc),
downloader->priv->bus);
gst_bus_set_sync_handler (downloader->priv->bus,
gst_uri_downloader_bus_handler, downloader, NULL);
pad = gst_element_get_static_pad (downloader->priv->urisrc, "src");
if (!pad)
return FALSE;
gst_pad_link (pad, downloader->priv->pad);
gst_object_unref (pad);
return TRUE;
}
GstFragment *
gst_uri_downloader_fetch_uri (GstUriDownloader * downloader, const gchar * uri)
{
return gst_uri_downloader_fetch_uri_with_range (downloader, uri, 0, -1);
}
/**
* gst_uri_downloader_fetch_uri_with_range:
* @downloader: the #GstUriDownloader
* @uri: the uri
* @range_start: the starting byte index
* @range_end: the final byte index, use -1 for unspecified
*
* Returns the downloaded #GstFragment
*/
GstFragment *
gst_uri_downloader_fetch_uri_with_range (GstUriDownloader * downloader,
const gchar * uri, gint64 range_start, gint64 range_end)
{
GstStateChangeReturn ret;
GstFragment *download = NULL;
GST_DEBUG_OBJECT (downloader, "Fetching URI %s", uri);
g_mutex_lock (&downloader->priv->download_lock);
GST_OBJECT_LOCK (downloader);
if (downloader->priv->cancelled) {
GST_DEBUG_OBJECT (downloader, "Cancelled, aborting fetch");
goto quit;
}
if (!gst_uri_downloader_set_uri (downloader, uri)) {
GST_WARNING_OBJECT (downloader, "Failed to set URI");
goto quit;
}
gst_bus_set_flushing (downloader->priv->bus, FALSE);
downloader->priv->download = gst_fragment_new ();
GST_OBJECT_UNLOCK (downloader);
ret = gst_element_set_state (downloader->priv->urisrc, GST_STATE_READY);
GST_OBJECT_LOCK (downloader);
if (ret == GST_STATE_CHANGE_FAILURE || downloader->priv->download == NULL) {
GST_WARNING_OBJECT (downloader, "Failed to set src to READY");
goto quit;
}
/* might have been cancelled because of failures in state change */
if (downloader->priv->cancelled) {
goto quit;
}
if (!gst_uri_downloader_set_range (downloader, range_start, range_end)) {
GST_WARNING_OBJECT (downloader, "Failed to set range");
goto quit;
}
GST_OBJECT_UNLOCK (downloader);
ret = gst_element_set_state (downloader->priv->urisrc, GST_STATE_PLAYING);
GST_OBJECT_LOCK (downloader);
if (ret == GST_STATE_CHANGE_FAILURE) {
if (downloader->priv->download) {
g_object_unref (downloader->priv->download);
downloader->priv->download = NULL;
}
goto quit;
}
/* might have been cancelled because of failures in state change */
if (downloader->priv->cancelled) {
goto quit;
}
/* wait until:
* - the download succeed (EOS in the src pad)
* - the download failed (Error message on the fetcher bus)
* - the download was canceled
*/
GST_DEBUG_OBJECT (downloader, "Waiting to fetch the URI %s", uri);
g_cond_wait (&downloader->priv->cond, GST_OBJECT_GET_LOCK (downloader));
if (downloader->priv->cancelled) {
if (downloader->priv->download) {
g_object_unref (downloader->priv->download);
downloader->priv->download = NULL;
}
goto quit;
}
download = downloader->priv->download;
downloader->priv->download = NULL;
if (download != NULL)
GST_INFO_OBJECT (downloader, "URI fetched successfully");
else
GST_INFO_OBJECT (downloader, "Error fetching URI");
quit:
{
gst_uri_downloader_stop (downloader);
GST_OBJECT_UNLOCK (downloader);
g_mutex_unlock (&downloader->priv->download_lock);
return download;
}
}