gstreamer/gst-libs/gst/media-info/media-info.c

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/* GStreamer media-info library
* Copyright (C) 2003,2004 Thomas Vander Stichele <thomas@apestaart.org>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <gst/gst.h>
#include <string.h>
#include "media-info.h"
#include "media-info-priv.h"
static void gst_media_info_class_init (GstMediaInfoClass *klass);
static void gst_media_info_instance_init (GstMediaInfo *info);
static void gst_media_info_get_property (GObject *object, guint prop_id,
GValue *value,
GParamSpec *pspec);
static gboolean _media_info_inited = FALSE;
/* FIXME: this is a lousy hack that needs to go */
#define MAX_METADATA_ITERS 5
/* GObject-y bits */
/* signal stuff */
enum
{
MEDIA_INFO_SIGNAL,
LAST_SIGNAL
};
static guint gst_media_info_signals[LAST_SIGNAL] = { 0 };
/*
* all GError stuff
*/
enum
{
MEDIA_INFO_ERROR_FILE
};
/* GError quark stuff */
GQuark
gst_media_info_error_quark (void)
{
static GQuark quark = 0;
if (quark == 0)
quark = g_quark_from_static_string ("gst-media-info-error-quark");
return quark;
}
/*
* GObject type stuff
*/
enum
{
PROP_SOURCE
};
static GObjectClass *parent_class = NULL;
GST_DEBUG_CATEGORY (gst_media_info_debug);
/* initialize the media-info library */
void
gst_media_info_init (void)
{
if (_media_info_inited) return;
/* register our debugging category */
GST_DEBUG_CATEGORY_INIT (gst_media_info_debug, "GST_MEDIA_INFO", 0,
"GStreamer media-info library");
GST_DEBUG ("Initialized media-info library");
_media_info_inited = TRUE;
}
GType
gst_media_info_get_type (void)
{
static GType gst_media_info_type = 0;
if (!gst_media_info_type)
{
static const GTypeInfo gst_media_info_info = {
sizeof (GstMediaInfoClass),
(GBaseInitFunc) NULL,
(GBaseFinalizeFunc) NULL,
(GClassInitFunc) gst_media_info_class_init,
NULL, NULL,
sizeof (GstMediaInfo),
0,
(GInstanceInitFunc) gst_media_info_instance_init,
NULL
};
gst_media_info_type = g_type_register_static (G_TYPE_OBJECT,
"GstMediaInfo",
&gst_media_info_info, 0);
}
return gst_media_info_type;
}
static void
gst_media_info_class_init (GstMediaInfoClass *klass)
{
GObjectClass *g_object_class = G_OBJECT_CLASS (klass);
parent_class = g_type_class_ref (G_TYPE_OBJECT);
//parent_class = g_type_class_peek_parent (klass);
/*
object_class->finalize = gst_media_info_finalize;
object_class->dispose = gst_media_info_dispose;
*/
/*
g_object_class->set_property = gst_media_info_set_property;
*/
g_object_class->get_property = gst_media_info_get_property;
klass->media_info_signal = NULL;
gst_media_info_signals [MEDIA_INFO_SIGNAL] =
g_signal_new ("media-info",
G_TYPE_FROM_CLASS (klass),
G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (GstMediaInfoClass, media_info_signal),
NULL, NULL,
gst_marshal_VOID__VOID,
G_TYPE_NONE, 0);
}
static void
gst_media_info_instance_init (GstMediaInfo *info)
{
GError **error;
info->priv = g_new0 (GstMediaInfoPriv, 1);
error = &info->priv->error;
if (!_media_info_inited) { gst_media_info_init (); }
gmip_init (info->priv, error);
gmip_reset (info->priv);
}
/* get/set */
static void
gst_media_info_get_property (GObject *object, guint prop_id,
GValue *value, GParamSpec *pspec)
{
GstMediaInfo *info = GST_MEDIA_INFO (object);
switch (prop_id)
{
case PROP_SOURCE:
g_value_set_string (value, info->priv->source_name);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
GstMediaInfo *
gst_media_info_new (GError **error)
{
GstMediaInfo *info = g_object_new (GST_MEDIA_INFO_TYPE, NULL);
if (info->priv->error)
{
if (error)
{
*error = info->priv->error;
info->priv->error = NULL;
}
else
{
g_warning ("Error creating GstMediaInfo object.\n%s",
info->priv->error->message);
g_error_free (info->priv->error);
}
}
return info;
}
/**
* public methods
*/
gboolean
gst_media_info_set_source (GstMediaInfo *info, const char *source, GError **error)
{
info->priv->source_name = g_strdup (source);
return TRUE;
}
/* idler-based implementation
* set up read on a given location
* FIXME: maybe we should check if the info is cleared when calling this
* function ? What happens if it gets called again on same info before
* previous one is done ?
*/
void
gst_media_info_read_with_idler (GstMediaInfo *info, const char *location,
guint16 flags, GError **error)
{
GstMediaInfoPriv *priv = info->priv;
gmip_reset (info->priv); /* reset all structs */
priv->location = g_strdup (location);
priv->flags = flags;
}
/* an idler which does the work of actually collecting all data
* this must be called repeatedly, until streamp is set to a non-NULL value
* returns: TRUE if it was able to idle, FALSE if there was an error
*/
gboolean
gst_media_info_read_idler (GstMediaInfo *info, GstMediaInfoStream **streamp, GError **error)
{
GstMediaInfoPriv *priv;
/* if it's NULL then we're sure something went wrong higher up) */
if (info == NULL) return FALSE;
g_return_val_if_fail (error == NULL || *error == NULL, FALSE);
priv = info->priv;
g_assert (streamp != NULL);
g_assert (priv);
switch (priv->state)
{
case GST_MEDIA_INFO_STATE_NULL:
/* make sure we have a source */
if (!priv->source_name)
{
*error = g_error_new (GST_MEDIA_INFO_ERROR, 0,
"No source set on media info.");
return FALSE;
}
/* need to find type */
GST_DEBUG ("idler: NULL, need to find type, priv %p", priv);
return gmip_find_type_pre (priv, error);
case GST_MEDIA_INFO_STATE_TYPEFIND:
{
gchar *mime;
GST_LOG ("STATE_TYPEFIND");
if ((priv->type == NULL) && gst_bin_iterate (GST_BIN (priv->pipeline)))
{
GST_DEBUG ("iterating while in STATE_TYPEFIND");
GMI_DEBUG("?");
return TRUE;
}
if (priv->type == NULL)
{
g_warning ("Couldn't find type\n");
return FALSE;
}
/* do the state transition */
GST_DEBUG ("doing find_type_post");
gmip_find_type_post (priv);
GST_DEBUG ("finding out mime type");
mime = g_strdup (gst_structure_get_name (
gst_caps_get_structure(priv->type, 0)));
GST_DEBUG ("found out mime type: %s", mime);
if (!gmi_set_mime (info, mime))
{
/* FIXME: pop up error */
GST_DEBUG ("no decoder pipeline found for mime %s", mime);
return FALSE;
}
priv->stream = gmi_stream_new ();
GST_DEBUG ("new stream: %p", priv->stream);
priv->stream->mime = mime;
priv->stream->path = priv->location;
gmip_find_stream_pre (priv);
}
case GST_MEDIA_INFO_STATE_STREAM:
{
GST_LOG ("STATE_STREAM");
if ((priv->format == NULL) && gst_bin_iterate (GST_BIN (priv->pipeline)))
{
GMI_DEBUG("?");
return TRUE;
}
if (priv->format == NULL)
{
g_warning ("Couldn't find format\n");
return FALSE;
}
/* do state transition; stream -> first track metadata */
priv->current_track_num = 0;
gmip_find_stream_post (priv);
priv->current_track = gmi_track_new ();
gmip_find_track_metadata_pre (priv);
return TRUE;
}
/* these ones are repeated per track */
case GST_MEDIA_INFO_STATE_METADATA:
{
if ((priv->metadata == NULL) &&
gst_bin_iterate (GST_BIN (priv->pipeline)) &&
priv->metadata_iters < MAX_METADATA_ITERS)
{
GMI_DEBUG("?");
priv->metadata_iters++;
return TRUE;
}
if (priv->metadata_iters == MAX_METADATA_ITERS)
g_print ("iterated a few times, didn't find metadata\n");
if (priv->metadata == NULL)
{
/* this is not a permanent failure */
GST_DEBUG ("Couldn't find metadata");
}
GST_DEBUG ("found metadata of track %ld", priv->current_track_num);
if (!gmip_find_track_metadata_post (priv)) return FALSE;
GST_DEBUG ("METADATA: going to STREAMINFO\n");
priv->state = GST_MEDIA_INFO_STATE_STREAMINFO;
return gmip_find_track_streaminfo_pre (priv);
}
case GST_MEDIA_INFO_STATE_STREAMINFO:
{
if ((priv->streaminfo == NULL) &&
gst_bin_iterate (GST_BIN (priv->pipeline)))
{
GMI_DEBUG("?");
return TRUE;
}
if (priv->streaminfo == NULL)
{
/* this is not a permanent failure */
GST_DEBUG ("Couldn't find streaminfo");
}
else
GST_DEBUG ("found streaminfo of track %ld", priv->current_track_num);
if (!gmip_find_track_streaminfo_post (priv)) return FALSE;
priv->state = GST_MEDIA_INFO_STATE_FORMAT;
return gmip_find_track_format_pre (priv);
}
case GST_MEDIA_INFO_STATE_FORMAT:
{
if ((priv->format == NULL) &&
gst_bin_iterate (GST_BIN (priv->pipeline)))
{
GMI_DEBUG("?");
return TRUE;
}
if (priv->format == NULL)
{
g_warning ("Couldn't find format\n");
return FALSE;
}
GST_DEBUG ("found format of track %ld", priv->current_track_num);
if (!gmip_find_track_format_post (priv)) return FALSE;
/* save the track info */
priv->stream->tracks = g_list_append (priv->stream->tracks,
priv->current_track);
/* these alloc'd data types have been handed off */
priv->current_track = NULL;
priv->location = NULL;
/* now see if we need to seek to a next track or not */
priv->current_track_num++;
if (priv->current_track_num < priv->stream->length_tracks)
{
gmi_seek_to_track (info, priv->current_track_num);
priv->current_track = gmi_track_new ();
if (!gmip_find_track_metadata_pre (priv))
{
g_free (priv->current_track);
return FALSE;
}
priv->state = GST_MEDIA_INFO_STATE_METADATA;
return TRUE;
}
priv->state = GST_MEDIA_INFO_STATE_DONE;
gmi_clear_decoder (info);
GST_DEBUG ("TOTALLY DONE, setting pointer *streamp to %p", *streamp);
*streamp = priv->stream;
priv->stream = NULL;
return TRUE;
}
case GST_MEDIA_INFO_STATE_DONE:
return TRUE;
default:
g_warning ("don't know what to do\n");
return FALSE;
}
}
/* main function
* read all possible info from the file pointed to by location
* use flags to limit the type of information searched for */
GstMediaInfoStream *
gst_media_info_read (GstMediaInfo *info, const char *location, guint16 flags, GError **error)
{
GstMediaInfoStream *stream = NULL;
gst_media_info_read_with_idler (info, location, flags, error);
if (*error) return FALSE;
while (gst_media_info_read_idler (info, &stream, error) && stream == NULL)
/* keep looping */;
if (*error)
return NULL;
return stream;
}
/*
* FIXME: reset ?
gboolean gst_media_info_write (GstMediaInfo *media_info,
const char *location,
GstCaps *media_info);
*/