gstreamer/gst-libs/gst/media-info/media-info.c
Thomas Vander Stichele 424db0d3ae another batch of connect->link fixes please let me know about issues and please refrain of making them yourself, so t...
Original commit message from CVS:
another batch of connect->link fixes
please let me know about issues
and please refrain of making them yourself, so that I don't spend double
the time resolving conflicts
2003-01-10 10:22:25 +00:00

817 lines
23 KiB
C

/* GStreamer
* Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
*
* 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.
*/
#include <gst/gst.h>
#include <string.h>
#include "media-info.h"
static gboolean _gst_media_info_debug = TRUE;
#define GMI_DEBUG(format, args...) \
{ if (_gst_media_info_debug) { g_print ( format , ## args ); }}
struct GstMediaInfoPriv
{
GstElement *pipeline;
GstElement *typefind;
GstCaps *type;
GstPad *decoder_pad; /* pad for querying decoded caps */
GstPad *source_pad; /* pad for querying encoded caps */
GstCaps *format;
GstCaps *metadata;
GstCaps *streaminfo;
GstElement *decoder; /* will be != NULL during collection */
gchar *source_element; /* type of element used as source */
GstElement *source;
GHashTable *decoders; /* a table of decoder GstElements */
GstMediaInfoStream *stream; /* total stream properties */
char *cache; /* location of cache */
};
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 void gst_media_info_reset (GstMediaInfo *info);
static void deep_notify_callback (GObject *object, GstObject *origin,
GParamSpec *pspec, GstMediaInfo *info);
/* helper structs bits */
static GstMediaInfoStream *
gst_media_info_stream_new (void)
{
GstMediaInfoStream *stream;
stream = g_malloc (sizeof (GstMediaInfoStream));
stream->length_tracks = 0;
stream->length_time = 0;
stream->bitrate = 0;
stream->seekable = FALSE;
stream->path = NULL;
stream->mime = NULL;
stream->tracks = NULL;
return stream;
}
static void
gst_media_info_stream_free (GstMediaInfoStream *stream)
{
if (stream->mime) g_free (stream->mime);
/* FIXME: free tracks */
g_free (stream);
}
static GstMediaInfoTrack *
gst_media_info_track_new (void)
{
GstMediaInfoTrack *track;
track = g_malloc (sizeof (GstMediaInfoTrack));
track->metadata = NULL;
track->streaminfo = NULL;
track->format = NULL;
track->length_time = 0;
track->con_streams = NULL;
return track;
}
/* GObject-y bits */
/* signal stuff */
enum
{
MEDIA_INFO_SIGNAL,
LAST_SIGNAL
};
static guint gst_media_info_signals[LAST_SIGNAL] = { 0 };
/* GError stuff */
/*
enum
{
MEDIA_INFO_ERROR_FILE
};
*/
/* GError quark stuff */
/*
static 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;
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_FIRST,
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)
{
GstElement *source;
info->priv = g_new0 (GstMediaInfoPriv, 1);
info->priv->pipeline = gst_pipeline_new ("media-info");
info->priv->typefind = gst_element_factory_make ("typefind", "typefind");
if (!GST_IS_ELEMENT (info->priv->typefind))
/* FIXME */
g_error ("Cannot create typefind element !");
/* ref it so it never goes away on removal out of bins */
gst_object_ref (GST_OBJECT (info->priv->typefind));
/* use gnomevfssrc by default */
source = gst_element_factory_make ("gnomevfssrc", "source");
if (GST_IS_ELEMENT (source))
{
info->priv->source = source;
info->priv->source_element = g_strdup ("gnomevfssrc");
gst_bin_add (GST_BIN (info->priv->pipeline), info->priv->source);
}
else
{
info->priv->source = NULL;
info->priv->source_element = NULL;
}
info->priv->decoder = NULL;
info->priv->type = NULL;
info->priv->format = NULL;
info->priv->metadata = NULL;
/* clear result pointers */
info->priv->stream = NULL;
/* set up decoder hash table */
info->priv->decoders = g_hash_table_new (g_str_hash, g_str_equal);
/* attach notify handler */
g_signal_connect (G_OBJECT (info->priv->pipeline), "deep_notify",
G_CALLBACK (deep_notify_callback), info);
}
/* 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_element);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
GstMediaInfo *
gst_media_info_new (const gchar *source_element)
{
GstMediaInfo *info = g_object_new (GST_MEDIA_INFO_TYPE, NULL);
if (source_element)
g_object_set (G_OBJECT (info), "source", source_element);
return info;
}
/**
* private functions
*/
/* callbacks */
static void
have_type_callback (GstElement *typefind, GstCaps *type, GstMediaInfo *info)
{
info->priv->type = type;
}
static void
deep_notify_callback (GObject *object, GstObject *origin,
GParamSpec *pspec, GstMediaInfo *info)
{
GValue value = { 0, };
if (strcmp (pspec->name, "metadata") == 0)
{
GMI_DEBUG("DEBUG: deep_notify: have metadata !\n");
g_value_init (&value, pspec->value_type);
g_object_get_property (G_OBJECT (origin), pspec->name, &value);
info->priv->metadata = g_value_peek_pointer (&value);
}
else if (strcmp (pspec->name, "caps") == 0)
{
/* check if we're getting it from the source we want it from */
if (GST_IS_PAD (origin) && GST_PAD (origin) == info->priv->decoder_pad)
{
GMI_DEBUG("DEBUG: deep_notify: have caps on decoder_pad !\n");
g_value_init (&value, pspec->value_type);
g_object_get_property (G_OBJECT (origin), pspec->name, &value);
info->priv->format = g_value_peek_pointer (&value);
}
else GMI_DEBUG("DEBUG: igoring caps on object %s:%s\n",
gst_object_get_name (gst_object_get_parent (origin)),
gst_object_get_name (origin));
}
else if (strcmp (pspec->name, "offset") == 0)
{
/* we REALLY ignore offsets, we hate them */
}
else if (strcmp (pspec->name, "streaminfo") == 0)
{
GMI_DEBUG("DEBUG: deep_notify: have streaminfo !\n");
g_value_init (&value, pspec->value_type);
g_object_get_property (G_OBJECT (origin), pspec->name, &value);
info->priv->streaminfo = g_value_peek_pointer (&value);
}
else GMI_DEBUG("DEBUG: ignoring notify of %s\n", pspec->name);
}
/* helpers */
/* reset info to a state where it can be used to query for media info
* clear caps, metadata, and so on */
static void
gst_media_info_reset (GstMediaInfo *info)
{
GstMediaInfoPriv *priv = info->priv;
/* clear out some stuff */
if (priv->format)
{
gst_caps_unref (priv->format);
priv->format = NULL;
}
if (priv->metadata)
{
gst_caps_unref (priv->metadata);
priv->metadata = NULL;
}
if (priv->stream)
{
g_free (priv->stream);
priv->stream = NULL;
}
}
/* seek to a track and reset metadata and streaminfo structs */
static gboolean
gst_media_info_seek_to_track (GstMediaInfo *info, long track)
{
GstEvent *event;
GstFormat track_format = 0;
GstMediaInfoPriv *priv = info->priv;
gboolean res;
/* FIXME: consider more nicks as "track" */
track_format = gst_format_get_by_nick ("logical_stream");
if (track_format == 0) return FALSE;
GMI_DEBUG("Track format: %d\n", track_format);
if (gst_element_set_state (priv->pipeline, GST_STATE_PLAYING)
== GST_STATE_FAILURE)
g_warning ("Couldn't set to play");
g_assert (GST_IS_PAD (info->priv->decoder_pad));
event = gst_event_new_seek (track_format |
GST_SEEK_METHOD_SET |
GST_SEEK_FLAG_FLUSH,
track);
res = gst_pad_send_event (info->priv->decoder_pad, event);
g_assert (res);
if (!res)
{
g_warning ("seek to logical track failed");
return FALSE;
}
/* clear structs because of the seek */
if (priv->metadata)
{
gst_caps_unref (priv->metadata);
priv->metadata = NULL;
}
if (priv->streaminfo)
{
gst_caps_unref (priv->streaminfo);
priv->streaminfo = NULL;
}
return TRUE;
}
/* create a good decoder for this mime type */
/* FIXME: maybe make this more generic with a type, so it can be used
* for taggers and other things as well */
GstElement *
gst_media_info_get_decoder (GstMediaInfo *info, const char *mime)
{
GstElement *decoder;
gchar *factory = NULL;
/* check if we have an active codec element in the hash table for this */
decoder = g_hash_table_lookup (info->priv->decoders, mime);
if (decoder == NULL)
{
GMI_DEBUG("DEBUG: no decoder in table, inserting one\n");
if (strcmp (mime, "application/x-ogg") == 0)
factory = g_strdup ("vorbisfile");
else if (strcmp (mime, "audio/x-mp3") == 0)
factory = g_strdup ("mad");
else if (strcmp (mime, "audio/x-wav") == 0)
factory = g_strdup ("wavparse");
if (factory == NULL)
return NULL;
GMI_DEBUG("DEBUG: using factory %s\n", factory);
decoder = gst_element_factory_make (factory, "decoder");
g_free (factory);
if (decoder)
{
g_hash_table_insert (info->priv->decoders, g_strdup (mime), decoder);
/* ref it so we don't lose it when removing from bin */
g_object_ref (GST_OBJECT (decoder));
}
}
return decoder;
}
/* find the type of a file and store it in the caps of the info
* FIXME: we might better return GstCaps instead of storing them
* internally */
static void
gst_media_info_find_type (GstMediaInfo *info, const char *location)
{
GstMediaInfoPriv *priv = info->priv;
/* clear vars that need clearing */
if (priv->type)
{
gst_caps_unref (priv->type);
priv->type = NULL;
}
GMI_DEBUG("DEBUG: gst_media_info_find_type: start\n");
/* find out type */
/* FIXME: we could move caps for typefind out of struct and
* just use it through this function only */
gst_bin_add (GST_BIN (priv->pipeline), priv->typefind);
g_object_set (G_OBJECT (priv->source), "location", location, NULL);
if (!gst_element_link (priv->source, priv->typefind))
g_warning ("Couldn't link source and typefind\n");
g_signal_connect (G_OBJECT (priv->typefind), "have-type",
G_CALLBACK (have_type_callback), info);
if (gst_element_set_state (priv->pipeline, GST_STATE_PLAYING)
== GST_STATE_FAILURE)
g_warning ("Couldn't set to play");
GMI_DEBUG("DEBUG: gst_media_info_find_type: iterating\n");
while ((priv->type == NULL) &&
gst_bin_iterate (GST_BIN (priv->pipeline)))
GMI_DEBUG("+");
GMI_DEBUG("\n");
/*clear up typefind */
gst_element_set_state (priv->pipeline, GST_STATE_READY);
gst_element_unlink (priv->source, priv->typefind);
gst_bin_remove (GST_BIN (priv->pipeline), priv->typefind);
}
/* get properties of complete physical stream
* and return them in pre-alloced stream struct */
static gboolean
gst_media_info_get_stream (GstMediaInfo *info, GstMediaInfoStream *stream)
{
GstMediaInfoPriv *priv = info->priv;
const GstFormat *formats;
GstFormat track_format = 0;
GstFormat format;
gint64 value;
gboolean res;
glong bytes = 0;
GMI_DEBUG("DEBUG:gst_media_info_get_stream start\n");
if (gst_element_set_state (priv->pipeline, GST_STATE_PLAYING)
== GST_STATE_FAILURE)
g_warning ("Couldn't set to play");
/* iterate until caps are found */
/* FIXME: this should be done through the plugin sending some signal
* that it is ready for queries */
while (gst_bin_iterate (GST_BIN (priv->pipeline)) &&
priv->format == NULL)
;
if (gst_element_set_state (priv->pipeline, GST_STATE_PAUSED)
== GST_STATE_FAILURE)
g_warning ("Couldn't set to paused");
if (priv->format == NULL)
{
GMI_DEBUG("DEBUG: gst_media_info_get_stream: couldn't get caps !");
return FALSE;
}
/* find a format that matches the "track" concept */
/* FIXME: this is used in vorbis, but we might have to loop when
* more codecs have tracks */
track_format = gst_format_get_by_nick ("logical_stream");
/* get supported formats on decoder pad */
formats = gst_pad_get_formats (priv->decoder_pad);
while (*formats)
{
const GstFormatDefinition *definition;
format = *formats;
g_assert (GST_IS_PAD (priv->decoder_pad));
res = gst_pad_query (priv->decoder_pad, GST_QUERY_TOTAL,
&format, &value);
definition = gst_format_get_details (*formats);
GMI_DEBUG("trying to figure out length for format %s\n", definition->nick);
if (res)
{
switch (format)
{
case GST_FORMAT_TIME:
stream->length_time = value;
g_print (" total %s: %lld\n", definition->nick, value);
break;
default:
/* separation is necessary because track_format doesn't resolve to
* int */
if (format == track_format)
{
stream->length_tracks = value;
g_print (" total %s: %lld\n", definition->nick, value);
}
else
g_print ("warning: unhandled format %s\n", definition->nick);
}
}
else
GMI_DEBUG("query didn't return result for %s\n", definition->nick);
formats++;
}
if (stream->length_tracks == 0) stream->length_tracks = 1;
/* now get number of bytes from the sink pad to get the bitrate */
format = GST_FORMAT_BYTES;
g_assert (GST_IS_PAD (priv->source_pad));
res = gst_pad_query (priv->source_pad, GST_QUERY_TOTAL,
&format, &value);
if (!res) g_warning ("Failed to query on sink pad !");
bytes = value;
if (bytes)
{
double seconds = stream->length_time / GST_SECOND;
double bits = bytes * 8;
stream->bitrate = (long) (bits / seconds);
}
return TRUE;
}
/* find metadata encoded in media */
GstCaps *
gst_media_info_find_metadata (GstMediaInfo *info)
{
GstMediaInfoPriv *priv = info->priv;
GstCaps *metadata;
if (gst_element_set_state (priv->pipeline, GST_STATE_PLAYING)
== GST_STATE_FAILURE)
g_warning ("Couldn't set to play");
GMI_DEBUG("DEBUG: gst_media_info_find_metadata: iterating\n");
while ((priv->metadata == NULL) &&
gst_bin_iterate (GST_BIN (priv->pipeline)))
GMI_DEBUG("+");
GMI_DEBUG("\n");
gst_element_set_state (priv->pipeline, GST_STATE_PAUSED);
metadata = priv->metadata;
priv->metadata = NULL;
return metadata;
}
/* find streaminfo found by decoder */
GstCaps *
gst_media_info_find_streaminfo (GstMediaInfo *info)
{
GstMediaInfoPriv *priv = info->priv;
GstCaps *streaminfo;
GstFormat format, track_format;
if (gst_element_set_state (priv->pipeline, GST_STATE_PLAYING)
== GST_STATE_FAILURE)
g_warning ("Couldn't set to play");
GMI_DEBUG("DEBUG: gst_media_info_find_streaminfo: iterating\n");
while ((priv->streaminfo == NULL) &&
gst_bin_iterate (GST_BIN (priv->pipeline)))
GMI_DEBUG("+");
GMI_DEBUG("\n");
gst_element_set_state (priv->pipeline, GST_STATE_PAUSED);
streaminfo = priv->streaminfo;
priv->streaminfo = NULL;
/* now add total length to this, and maybe even bitrate ? FIXME */
track_format = gst_format_get_by_nick ("logical_stream");
if (track_format == 0)
{
g_print ("FIXME: implement getting length of whole track\n");
}
else
{
/* which one are we at ? */
long track_num;
gint64 value_start, value_end;
gboolean res;
res = gst_pad_query (priv->decoder_pad, GST_QUERY_POSITION,
&track_format, &value_start);
if (res)
{
format = GST_FORMAT_TIME;
track_num = value_start;
GMI_DEBUG("DEBUG: we are currently at %ld\n", track_num);
res = gst_pad_convert (priv->decoder_pad,
track_format, track_num,
&format, &value_start);
res &= gst_pad_convert (priv->decoder_pad,
track_format, track_num + 1,
&format, &value_end);
if (res)
{
GstPropsEntry *length;
/* substract to get the length */
GMI_DEBUG("DEBUG: start %lld, end %lld\n", value_start, value_end);
value_end -= value_start;
g_print ("DEBUG: length: %d\n", (int) value_end);
length = gst_props_entry_new ("length", GST_PROPS_INT ((int) value_end));
gst_props_add_entry (gst_caps_get_props (streaminfo), length);
}
}
}
return streaminfo;
}
/* find format found by decoder */
GstCaps *
gst_media_info_find_format (GstMediaInfo *info)
{
GstMediaInfoPriv *priv = info->priv;
GstCaps *format;
if (gst_element_set_state (priv->pipeline, GST_STATE_PLAYING)
== GST_STATE_FAILURE)
g_warning ("Couldn't set to play");
GMI_DEBUG("DEBUG: gst_media_info_find_format: iterating\n");
while ((priv->format == NULL) &&
gst_bin_iterate (GST_BIN (priv->pipeline)))
GMI_DEBUG("+");
GMI_DEBUG("\n");
gst_element_set_state (priv->pipeline, GST_STATE_PAUSED);
format = priv->format;
priv->format = NULL;
return format;
}
/* clear the decoder
* (if it was set)
*/
static void
gst_media_info_clear_decoder (GstMediaInfo *info)
{
if (info->priv->decoder)
{
/* clear up decoder */
/* FIXME: shouldn't need to set state here */
gst_element_set_state (info->priv->pipeline, GST_STATE_READY);
gst_element_unlink (info->priv->source, info->priv->decoder);
gst_bin_remove (GST_BIN (info->priv->pipeline), info->priv->decoder);
info->priv->decoder = NULL;
}
}
/* set the decoder to be used for decoding
* install callback handlers
*/
static void
gst_media_info_set_decoder (GstMediaInfo *info, GstElement *decoder)
{
GstMediaInfoPriv *priv = info->priv;
/* set up pipeline and connect signal handlers */
priv->decoder = decoder;
gst_bin_add (GST_BIN (priv->pipeline), decoder);
if (!gst_element_link (priv->source, decoder))
g_warning ("Couldn't link source and decoder\n");
/* FIXME: we should be link to ALL possible src pads */
if (!(priv->decoder_pad = gst_element_get_pad (decoder, "src")))
g_warning ("Couldn't get decoder pad\n");
if (!(priv->source_pad = gst_element_get_pad (priv->source, "src")))
g_warning ("Couldn't get source pad\n");
}
/**
* public methods
*/
gboolean
gst_media_info_set_source (GstMediaInfo *info, const char *source)
{
GstElement *src;
src = gst_element_factory_make (source, "new-source");
if (!GST_IS_ELEMENT (src))
return FALSE;
if (info->priv->source)
{
/* this also unrefs the element */
gst_bin_remove (GST_BIN (info->priv->pipeline), info->priv->source);
if (info->priv->source_element)
{
g_free (info->priv->source_element);
info->priv->source_element = NULL;
}
}
g_object_set (G_OBJECT (src), "name", "source", NULL);
gst_bin_add (GST_BIN (info->priv->pipeline), src);
info->priv->source = src;
info->priv->source_element = g_strdup (source);
return TRUE;
}
GstMediaInfoStream *
gst_media_info_read (GstMediaInfo *info, const char *location, guint16 flags)
{
GstMediaInfoPriv *priv = info->priv;
GstElement *decoder = NULL;
const gchar *mime;
GstMediaInfoStream *stream = NULL;
int i;
GMI_DEBUG("DEBUG: gst_media_info_read: start\n");
gst_media_info_reset (info); /* reset all structs */
/* find out type */
/* FIXME: we could move caps for typefind out of struct and
* just use it through this function only */
gst_media_info_find_type (info, location);
if (priv->type == NULL)
{
/* iteration ended, still don't have type, ugh */
g_warning ("iteration ended, type not found !\n");
return NULL;
}
stream = gst_media_info_stream_new ();
mime = gst_caps_get_mime (priv->type);
if (flags & GST_MEDIA_INFO_MIME)
stream->mime = g_strdup (mime);
stream->path = g_strdup (location);
GMI_DEBUG("mime type: %s\n", mime);
decoder = gst_media_info_get_decoder (info, mime);
/* if it's NULL, then that's a sign we can't decode it */
if (decoder == NULL)
{
g_warning ("Can't find a decoder for type %s\n", mime);
gst_media_info_stream_free (stream);
return NULL;
}
/* install this decoder in the pipeline */
gst_media_info_set_decoder (info, decoder);
/* collect total stream properties */
gst_media_info_get_stream (info, stream);
/* if we have multiple tracks, loop over them; if not, just get
* metadata and return it */
GMI_DEBUG("DEBUG: num tracks %ld\n", stream->length_tracks);
for (i = 0; i < stream->length_tracks; ++i)
{
GstMediaInfoTrack *track = gst_media_info_track_new ();
if (i > 0)
{
GMI_DEBUG("seeking to track %d\n", i);
gst_media_info_seek_to_track (info, i);
}
if (flags & GST_MEDIA_INFO_METADATA)
track->metadata = gst_media_info_find_metadata (info);
if (flags & GST_MEDIA_INFO_STREAMINFO)
track->streaminfo = gst_media_info_find_streaminfo (info);
if (flags & GST_MEDIA_INFO_FORMAT)
track->format = gst_media_info_find_format (info);
stream->tracks = g_list_append (stream->tracks, track);
}
gst_media_info_clear_decoder (info);
/* please return it */
return stream;
}
/*
* FIXME: reset ?
gboolean gst_media_info_write (GstMediaInfo *media_info,
const char *location,
GstCaps *media_info);
*/