gstreamer/ext/gnomevfs/gstgnomevfssrc.c

/* GStreamer
 * Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
 *                    2000 Wim Taymans <wtay@chello.be>
 *                    2001 Bastien Nocera <hadess@hadess.net>
 *                    2002 Kristian Rietveld <kris@gtk.org>
 *                    2002 Colin Walters <walters@gnu.org>
 *
 * gnomevfssrc.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., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 */

#define BROKEN_SIG 1
/*#undef BROKEN_SIG */

#include <sys/types.h>
#include <sys/socket.h>
#include <sys/time.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <sys/mman.h>
#include <errno.h>
#include <string.h>

#include <gst/gst.h>
#include <libgnomevfs/gnome-vfs.h>
/* gnome-vfs.h doesn't include the following header, which we need: */
#include <libgnomevfs/gnome-vfs-standard-callbacks.h>

GstElementDetails gst_gnomevfssrc_details;

#define GST_TYPE_GNOMEVFSSRC \
  (gst_gnomevfssrc_get_type())
#define GST_GNOMEVFSSRC(obj) \
  (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_GNOMEVFSSRC,GstGnomeVFSSrc))
#define GST_GNOMEVFSSRC_CLASS(klass) \
  (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_GNOMEVFSSRC,GstGnomeVFSSrcClass))
#define GST_IS_GNOMEVFSSRC(obj) \
  (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_GNOMEVFSSRC))
#define GST_IS_GNOMEVFSSRC_CLASS(obj) \
  (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_GNOMEVFSSRC))

static GStaticMutex count_lock = G_STATIC_MUTEX_INIT;
static gint ref_count = 0;
static gboolean vfs_owner = FALSE;

typedef enum {
	GST_GNOMEVFSSRC_OPEN = GST_ELEMENT_FLAG_LAST,

	GST_GNOMEVFSSRC_FLAG_LAST = GST_ELEMENT_FLAG_LAST + 2,
} GstGnomeVFSSrcFlags;

typedef struct _GstGnomeVFSSrc GstGnomeVFSSrc;
typedef struct _GstGnomeVFSSrcClass GstGnomeVFSSrcClass;

struct _GstGnomeVFSSrc {
	GstElement element;
	/* pads */
	GstPad *srcpad;

	/* filename */
	gchar *filename;
	/* is it a local file ? */
	gboolean is_local;
	/* uri */
	GnomeVFSURI *uri;

	/* handle */
	GnomeVFSHandle *handle;
	/* Seek stuff */
	gboolean need_flush;

	/* local filename */
	gchar *local_name;
	/* fd for local file fallback */
	gint fd;
	/* mmap */
	guchar *map;			/* where the file is mapped to */

	/* details for fallback synchronous read */
	GnomeVFSFileSize size;
	GnomeVFSFileOffset curoffset;	/* current offset in file */
	gulong bytes_per_read;		/* bytes per read */
	gboolean new_seek;

	/* icecast/audiocast metadata extraction handling */
	gboolean iradio_mode;
	gboolean iradio_callbacks_pushed;

	gint icy_metaint;
	GnomeVFSFileSize icy_count;

	gchar *iradio_name;
	gchar *iradio_genre;
	gchar *iradio_url;
	gchar *iradio_title;

	GThread *audiocast_thread;
	GList *audiocast_notify_queue;
	GMutex *audiocast_queue_mutex;
	GMutex *audiocast_udpdata_mutex;
	gint audiocast_thread_die_infd;
	gint audiocast_thread_die_outfd;
	gint audiocast_port;
	gint audiocast_fd;
};

struct _GstGnomeVFSSrcClass {
	GstElementClass parent_class;
};

/* elementfactory information */
GstElementDetails gst_gnomevfssrc_details = {
	"GnomeVFS Source",
	"Source/File",
	"LGPL",
	"Read from any GnomeVFS file",
	VERSION,
	"Bastien Nocera <hadess@hadess.net>",
	"(C) 2001",
};

GST_FORMATS_FUNCTION (gst_gnomevfssrc_get_formats,
	GST_FORMAT_BYTES
)

GST_PAD_QUERY_TYPE_FUNCTION (gst_gnomevfssrc_get_query_types,
	GST_PAD_QUERY_TOTAL,
	GST_PAD_QUERY_POSITION
)

GST_EVENT_MASK_FUNCTION (gst_gnomevfssrc_get_event_mask,
  { GST_EVENT_SEEK, GST_SEEK_METHOD_CUR |
                    GST_SEEK_METHOD_SET |
                    GST_SEEK_METHOD_END |
                    GST_SEEK_FLAG_FLUSH },
  { GST_EVENT_FLUSH, 0 },
  { GST_EVENT_SIZE, 0 }
)

/* GnomeVFSSrc signals and args */
enum {
	LAST_SIGNAL
};

enum {
	ARG_0,
	ARG_LOCATION,
	ARG_BYTESPERREAD,
	ARG_OFFSET,
	ARG_FILESIZE,
	ARG_IRADIO_MODE,
	ARG_IRADIO_NAME,
	ARG_IRADIO_GENRE,
	ARG_IRADIO_URL,
	ARG_IRADIO_TITLE,
};

GType gst_gnomevfssrc_get_type(void);

static void 		gst_gnomevfssrc_class_init	(GstGnomeVFSSrcClass *klass);
static void 		gst_gnomevfssrc_init		(GstGnomeVFSSrc *gnomevfssrc);
static void 		gst_gnomevfssrc_dispose		(GObject *object);

static void 		gst_gnomevfssrc_set_property	(GObject *object, guint prop_id,
							 const GValue *value, GParamSpec *pspec);
static void 		gst_gnomevfssrc_get_property	(GObject *object, guint prop_id,
							 GValue *value, GParamSpec *pspec);

static GstBuffer*	gst_gnomevfssrc_get		(GstPad *pad);

static GstElementStateReturn 
			gst_gnomevfssrc_change_state	(GstElement *element);

static void 		gst_gnomevfssrc_close_file	(GstGnomeVFSSrc *src);
static gboolean 	gst_gnomevfssrc_open_file	(GstGnomeVFSSrc *src);
static gboolean 	gst_gnomevfssrc_srcpad_event 	(GstPad *pad, GstEvent *event);
static gboolean 	gst_gnomevfssrc_srcpad_query 	(GstPad *pad, GstPadQueryType type,
		              				 GstFormat *format, gint64 *value);

static int audiocast_init(GstGnomeVFSSrc *src);
static int audiocast_register_listener(gint *port, gint *fd);
static void audiocast_do_notifications(GstGnomeVFSSrc *src);
static gpointer audiocast_thread_run(GstGnomeVFSSrc *src);
static void audiocast_thread_kill(GstGnomeVFSSrc *src);

static GstElementClass *parent_class = NULL;

GType gst_gnomevfssrc_get_type(void)
{
	static GType gnomevfssrc_type = 0;

	if (!gnomevfssrc_type) {
		static const GTypeInfo gnomevfssrc_info = {
			sizeof(GstGnomeVFSSrcClass),      NULL,
			NULL,
			(GClassInitFunc) gst_gnomevfssrc_class_init,
			NULL,
			NULL,
			sizeof(GstGnomeVFSSrc),
			0,
			(GInstanceInitFunc) gst_gnomevfssrc_init,
		};
		gnomevfssrc_type =
			g_type_register_static(GST_TYPE_ELEMENT,
					"GstGnomeVFSSrc",
					&gnomevfssrc_info,
					0);
	}
	return gnomevfssrc_type;
}

static void gst_gnomevfssrc_class_init(GstGnomeVFSSrcClass *klass)
{
	GObjectClass *gobject_class;
	GstElementClass *gstelement_class;

	gobject_class = (GObjectClass *) klass;
	gstelement_class = (GstElementClass *) klass;

	parent_class = g_type_class_ref(GST_TYPE_ELEMENT);

      	gst_element_class_install_std_props (
               GST_ELEMENT_CLASS (klass),
               "offset",       ARG_OFFSET,       G_PARAM_READWRITE,
               "filesize",     ARG_FILESIZE,     G_PARAM_READABLE,
               "bytesperread", ARG_BYTESPERREAD, G_PARAM_READWRITE,
               "location",     ARG_LOCATION,     G_PARAM_READWRITE,
               NULL);

	gobject_class->dispose         = gst_gnomevfssrc_dispose;

	/* icecast stuff */
	g_object_class_install_property (gobject_class,
					 ARG_IRADIO_MODE,
					 g_param_spec_boolean ("iradio-mode",
							       "iradio-mode",
							       "Enable internet radio mode (extraction of icecast/audiocast metadata)",
							       FALSE,
							       G_PARAM_READWRITE));
	g_object_class_install_property (gobject_class,
					 ARG_IRADIO_NAME,
					 g_param_spec_string ("iradio-name",
							      "iradio-name",
							      "Name of the stream",
							      NULL,
							      G_PARAM_READABLE));
	g_object_class_install_property (gobject_class,
					 ARG_IRADIO_GENRE,
					 g_param_spec_string ("iradio-genre",
							      "iradio-genre",
							      "Genre of the stream",

							      NULL,
							      G_PARAM_READABLE));
	g_object_class_install_property (gobject_class,
					 ARG_IRADIO_URL,
					 g_param_spec_string ("iradio-url",
							      "iradio-url",
							      "Homepage URL for radio stream",
							      NULL,
							      G_PARAM_READABLE));
	g_object_class_install_property (gobject_class,
					 ARG_IRADIO_TITLE,
					 g_param_spec_string ("iradio-title",
							      "iradio-title",
							      "Name of currently playing song",
							      NULL,
							      G_PARAM_READABLE));

	gstelement_class->set_property = gst_gnomevfssrc_set_property;
	gstelement_class->get_property = gst_gnomevfssrc_get_property;

	gstelement_class->change_state = gst_gnomevfssrc_change_state;
}

static void gst_gnomevfssrc_init(GstGnomeVFSSrc *gnomevfssrc)
{
	gnomevfssrc->srcpad = gst_pad_new("src", GST_PAD_SRC);
	gst_pad_set_get_function(gnomevfssrc->srcpad, gst_gnomevfssrc_get);
	gst_pad_set_event_mask_function (gnomevfssrc->srcpad, 
			gst_gnomevfssrc_get_event_mask);
	gst_pad_set_event_function (gnomevfssrc->srcpad,
			gst_gnomevfssrc_srcpad_event);
	gst_pad_set_query_type_function (gnomevfssrc->srcpad, 
			gst_gnomevfssrc_get_query_types);
	gst_pad_set_query_function (gnomevfssrc->srcpad,
			gst_gnomevfssrc_srcpad_query);
	gst_pad_set_formats_function (gnomevfssrc->srcpad, 
			gst_gnomevfssrc_get_formats);
	gst_element_add_pad(GST_ELEMENT(gnomevfssrc), gnomevfssrc->srcpad);

	gnomevfssrc->filename = NULL;
	gnomevfssrc->is_local = FALSE;
	gnomevfssrc->uri = NULL;
	gnomevfssrc->handle = NULL;
	gnomevfssrc->fd = 0;
	gnomevfssrc->curoffset = 0;
	gnomevfssrc->bytes_per_read = 4096;
	gnomevfssrc->new_seek = FALSE;

	gnomevfssrc->icy_metaint = 0;

	gnomevfssrc->iradio_mode = FALSE;
	gnomevfssrc->iradio_callbacks_pushed = FALSE;
	gnomevfssrc->icy_count = 0;
	gnomevfssrc->iradio_name = NULL;
	gnomevfssrc->iradio_genre = NULL;
	gnomevfssrc->iradio_url = NULL;
	gnomevfssrc->iradio_title = NULL;

	gnomevfssrc->audiocast_udpdata_mutex = g_mutex_new(); 
	gnomevfssrc->audiocast_queue_mutex = g_mutex_new(); 
	gnomevfssrc->audiocast_notify_queue = NULL;
	gnomevfssrc->audiocast_thread = NULL;
		
	g_static_mutex_lock (&count_lock);
	if (ref_count == 0) {
		/* gnome vfs engine init */
		if (gnome_vfs_initialized() == FALSE) {
			gnome_vfs_init();
			vfs_owner = TRUE;
		}
	}
	ref_count++;
	g_static_mutex_unlock (&count_lock);
}

static void
gst_gnomevfssrc_dispose (GObject *object)
{
	g_static_mutex_lock (&count_lock);
	ref_count--;
	if (ref_count == 0 && vfs_owner) {
		if (gnome_vfs_initialized() == TRUE) {
			gnome_vfs_shutdown();
		}
	}
	g_static_mutex_unlock (&count_lock);

  	G_OBJECT_CLASS (parent_class)->dispose (object);
}


static void gst_gnomevfssrc_set_property(GObject *object, guint prop_id, const GValue *value, GParamSpec *pspec)
{
	GstGnomeVFSSrc *src;
        const gchar *location;
        gchar cwd[PATH_MAX];

	/* it's not null if we got it, but it might not be ours */
	g_return_if_fail(GST_IS_GNOMEVFSSRC(object));

	src = GST_GNOMEVFSSRC(object);

	switch (prop_id) {
	case ARG_LOCATION:
		/* the element must be stopped or paused in order to do this */
		g_return_if_fail((GST_STATE(src) < GST_STATE_PLAYING)
				 || (GST_STATE(src) == GST_STATE_PAUSED));

		g_free(src->filename);

		/* clear the filename if we get a NULL (is that possible?) */
		if (g_value_get_string (value) == NULL) {
			gst_element_set_state(GST_ELEMENT(object), GST_STATE_NULL);
			src->filename = NULL;
		} else {
			/* otherwise set the new filename */
                        location = g_value_get_string (value);
                        /* if it's not a proper uri, default to file: -- this
                         * is a crude test */
                        if (!strchr (location, ':'))
			{
				gchar *newloc = gnome_vfs_escape_path_string(location);
                                if (*newloc == '/')
                                        src->filename = g_strdup_printf ("file://%s", newloc);
                                else
                                        src->filename = g_strdup_printf ("file://%s/%s", getcwd(cwd, PATH_MAX), newloc);
				g_free(newloc);
			}
                        else
                                src->filename = g_strdup (g_value_get_string (value));
		}

		if ((GST_STATE(src) == GST_STATE_PAUSED)
		    && (src->filename != NULL)) {
			gst_gnomevfssrc_close_file(src);
			gst_gnomevfssrc_open_file(src);
		}
		break;
	case ARG_BYTESPERREAD:
		src->bytes_per_read = g_value_get_int (value);
		break;
	case ARG_OFFSET:
		src->curoffset = g_value_get_int64 (value);
		src->new_seek = TRUE;
		break;
	case ARG_IRADIO_MODE:
		src->iradio_mode = g_value_get_boolean (value);
		break;
	default:
		G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
		break;
	}
}

static void gst_gnomevfssrc_get_property(GObject *object, guint prop_id, GValue *value, GParamSpec *pspec)
{
	GstGnomeVFSSrc *src;

	/* it's not null if we got it, but it might not be ours */
	g_return_if_fail(GST_IS_GNOMEVFSSRC(object));

	src = GST_GNOMEVFSSRC(object);

	switch (prop_id) {
	case ARG_LOCATION:
		g_value_set_string (value, src->filename);
		break;
	case ARG_BYTESPERREAD:
		g_value_set_int (value, src->bytes_per_read);
		break;
	case ARG_OFFSET:
		g_value_set_int64 (value, src->curoffset);
		break;
	case ARG_FILESIZE:
		g_value_set_int64 (value, src->size);
		break;
	case ARG_IRADIO_MODE:
		g_value_set_boolean (value, src->iradio_mode);
		break;
	case ARG_IRADIO_NAME:
		g_value_set_string (value, src->iradio_name);
		break;
	case ARG_IRADIO_GENRE:
		g_value_set_string (value, src->iradio_genre);
		break;
	case ARG_IRADIO_URL:
		g_value_set_string (value, src->iradio_url);
		break;
	case ARG_IRADIO_TITLE:
		g_mutex_lock(src->audiocast_udpdata_mutex);
		g_value_set_string (value, src->iradio_title);
		g_mutex_unlock(src->audiocast_udpdata_mutex);
		break;
	default:
		G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
		break;
	}
}

/*
 * icecast/audiocast metadata extraction support code
 */

static int audiocast_init(GstGnomeVFSSrc *src)
{
	int pipefds[2];
	GError *error = NULL;
	if (!src->iradio_mode)
		return TRUE;
	GST_DEBUG (0,"audiocast: registering listener");
	if (audiocast_register_listener(&src->audiocast_port, &src->audiocast_fd) < 0)
	{
		gst_element_error(GST_ELEMENT(src),
				  "opening vfs file \"%s\" (%s)",
				  src->filename, 
				  "unable to register UDP port");
		close(src->audiocast_fd);
		return FALSE;
	}
	GST_DEBUG (0,"audiocast: creating pipe");
	src->audiocast_notify_queue = NULL;
	if (pipe(pipefds) < 0)
	{
		close(src->audiocast_fd);
		return FALSE;
	}
	src->audiocast_thread_die_infd = pipefds[0];
	src->audiocast_thread_die_outfd = pipefds[1];
	GST_DEBUG (0,"audiocast: creating audiocast thread");
	src->audiocast_thread = g_thread_create((GThreadFunc) audiocast_thread_run, src, TRUE, &error);
	if (error != NULL) {
		gst_element_error(GST_ELEMENT(src),
				  "opening vfs file \"%s\" (unable to create thread: %s)",
				  src->filename, 
				  error->message);
		close(src->audiocast_fd);
		return FALSE;
	}
	return TRUE;
}

static int audiocast_register_listener(gint *port, gint *fd)
{
	struct sockaddr_in sin;
	int sock;
	socklen_t sinlen = sizeof (struct sockaddr_in);

	GST_DEBUG (0,"audiocast: estabilishing UDP listener");

	if ((sock = socket(AF_INET, SOCK_DGRAM, 0)) < 0)
		goto lose;
	
	memset(&sin, 0, sinlen);
	sin.sin_family = AF_INET;
	sin.sin_addr.s_addr = g_htonl(INADDR_ANY);
			
	if (bind(sock, (struct sockaddr *)&sin, sinlen) < 0)
		goto lose_and_close;

	memset(&sin, 0, sinlen);
	if (getsockname(sock, (struct sockaddr *)&sin, &sinlen) < 0)
		goto lose_and_close;

	GST_DEBUG (0,"audiocast: listening on local %s:%d", inet_ntoa(sin.sin_addr), g_ntohs(sin.sin_port));

	*port = g_ntohs(sin.sin_port);
	*fd = sock;

	return 0;
lose_and_close:
	close(sock);
lose:
	return -1;
}

static void audiocast_do_notifications(GstGnomeVFSSrc *src)
{
	/* Send any pending notifications we got from the UDP thread. */
	if (src->iradio_mode)
	{
		GList *entry;
		g_mutex_lock(src->audiocast_queue_mutex);
		for (entry = src->audiocast_notify_queue; entry; entry = entry->next)
			g_object_notify(G_OBJECT (src), (const gchar *) entry->data);
		g_list_free(src->audiocast_notify_queue);
		src->audiocast_notify_queue = NULL;
		g_mutex_unlock(src->audiocast_queue_mutex);
	}		
}

static gpointer audiocast_thread_run(GstGnomeVFSSrc *src)
{
	char buf[1025], **lines;
	char *valptr;
	gsize len;
	fd_set fdset, readset;
	struct sockaddr_in from;
	socklen_t fromlen = sizeof(struct sockaddr_in);

	FD_ZERO(&fdset);

	FD_SET(src->audiocast_fd, &fdset);
	FD_SET(src->audiocast_thread_die_infd, &fdset);

	while (1)
	{
		GST_DEBUG (0,"audiocast thread: dropping into select");
		readset = fdset;
		if (select(FD_SETSIZE, &readset, NULL, NULL, NULL) < 0) {
			perror("select");
			return NULL;
		}
		if (FD_ISSET(src->audiocast_thread_die_infd, &readset)) {
			char buf[1];
			GST_DEBUG (0,"audiocast thread: got die character");
			read(src->audiocast_thread_die_infd, buf, 1);
			close(src->audiocast_thread_die_infd);
			close(src->audiocast_fd);
			return NULL;
		}
		GST_DEBUG (0,"audiocast thread: reading data");
		len = recvfrom(src->audiocast_fd, buf, sizeof(buf) - 1, 0, (struct sockaddr *) &from, &fromlen);
		if (len < 0 && errno == EAGAIN)
			continue;
		else if (len >= 0)
		{
			int i;
			buf[len] = '\0';
			lines = g_strsplit(buf, "\n", 0);
			if (!lines)
				continue;
	
			for (i = 0; lines[i]; i++) {
				while ((lines[i][strlen(lines[i]) - 1] == '\n') ||
				       (lines[i][strlen(lines[i]) - 1] == '\r'))
					lines[i][strlen(lines[i]) - 1] = '\0';
			
				valptr = strchr(lines[i], ':');
			
				if (!valptr)
					continue;
				else
					valptr++;
		
				g_strstrip(valptr);
				if (!strlen(valptr))
					continue;
		
				if (!strncmp(lines[i], "x-audiocast-streamtitle", 23)) {
					g_mutex_lock(src->audiocast_udpdata_mutex);
					if (src->iradio_title)
						g_free(src->iradio_title);
					src->iradio_title = g_strdup(valptr);
					g_mutex_unlock(src->audiocast_udpdata_mutex);
					g_mutex_lock(src->audiocast_queue_mutex);
					src->audiocast_notify_queue = g_list_append(src->audiocast_notify_queue, "iradio-title");
					GST_DEBUG(0,"audiocast title: %s\n", src->iradio_title);
					g_mutex_unlock(src->audiocast_queue_mutex);
				} else if (!strncmp(lines[i], "x-audiocast-streamurl", 21)) {
					g_mutex_lock(src->audiocast_udpdata_mutex);
					if (src->iradio_url)
						g_free(src->iradio_url);
					src->iradio_url = g_strdup(valptr);
					g_mutex_unlock(src->audiocast_udpdata_mutex);
					g_mutex_lock(src->audiocast_queue_mutex);
					src->audiocast_notify_queue = g_list_append(src->audiocast_notify_queue, "iradio-url");
					GST_DEBUG(0,"audiocast url: %s\n", src->iradio_title);
					g_mutex_unlock(src->audiocast_queue_mutex);
				} else if (!strncmp(lines[i], "x-audiocast-udpseqnr", 20)) {
					gchar outbuf[120];
					sprintf(outbuf, "x-audiocast-ack: %ld \r\n", atol(valptr));
					if (sendto(src->audiocast_fd, outbuf, strlen(outbuf), 0, (struct sockaddr *) &from, fromlen) <= 0) {
						fprintf(stderr, "Error sending response to server: %s\n", strerror(errno));
						continue;
					}
					GST_DEBUG(0,"sent audiocast ack: %s\n", outbuf);
				}
			}
			g_strfreev(lines);
		}
	}
	return NULL;
}

static void audiocast_thread_kill(GstGnomeVFSSrc *src)
{
	if (!src->audiocast_thread)
		return;
	
	/*
	  We rely on this hack to kill the
	  audiocast thread.  If we get icecast
	  metadata, then we don't need the
	  audiocast metadata too.
	*/
	GST_DEBUG (0,"audiocast: writing die character");
	write(src->audiocast_thread_die_outfd, "q", 1);
	close(src->audiocast_thread_die_outfd);
	GST_DEBUG (0,"audiocast: joining thread");
	g_thread_join(src->audiocast_thread);
	src->audiocast_thread = NULL;
}

static void
gst_gnomevfssrc_send_additional_headers_callback (gconstpointer in,
						  gsize         in_size,
						  gpointer      out,
						  gsize         out_size,
						  gpointer      callback_data)
{
	GstGnomeVFSSrc *src = GST_GNOMEVFSSRC (callback_data);
	GnomeVFSModuleCallbackAdditionalHeadersOut *out_args =
                (GnomeVFSModuleCallbackAdditionalHeadersOut *)out;

	if (!src->iradio_mode)
		return;
	GST_DEBUG(0,"sending headers\n");

        out_args->headers = g_list_append (out_args->headers,
                                           g_strdup ("icy-metadata:1\r\n"));
        out_args->headers = g_list_append (out_args->headers,
                                           g_strdup_printf ("x-audiocast-udpport: %d\r\n", src->audiocast_port));
}

static void
gst_gnomevfssrc_received_headers_callback (gconstpointer in,
					   gsize         in_size,
					   gpointer      out,
					   gsize         out_size,
					   gpointer      callback_data)
{
	GList *i;
	gint icy_metaint;
	GstGnomeVFSSrc *src = GST_GNOMEVFSSRC (callback_data);
        GnomeVFSModuleCallbackReceivedHeadersIn *in_args =
                (GnomeVFSModuleCallbackReceivedHeadersIn *)in;

	if (!src->iradio_mode)
		return;

        for (i = in_args->headers; i; i = i->next) {
		char *data = (char *) i->data;
		char *key;
		char *value = strchr(data, ':');
		if (!value)
			continue;

		value++;
		g_strstrip(value);
		if (!strlen(value))
			continue;

		/* Icecast stuff */
                if (!strncmp (data, "icy-metaint:", 12)) /* ugh */
		{ 
                        sscanf (data + 12, "%d", &icy_metaint);
			src->icy_metaint = icy_metaint;
			GST_DEBUG (0,"got icy-metaint, killing audiocast thread");
			audiocast_thread_kill(src);
			continue;
		}

		if (!strncmp(data, "icy-", 4))
			key = data + 4;
		else if (!strncmp(data, "x-audiocast-", 12))
			key = data + 12;
		else
			continue;

		GST_DEBUG (0,"key: %s", key);
                if (!strncmp (key, "name", 4)) {
			if (src->iradio_name)
				g_free (src->iradio_name);
			src->iradio_name = g_strdup (value);
			g_object_notify (G_OBJECT (src), "iradio-name");
                } else if (!strncmp (key, "genre", 5)) {
			if (src->iradio_genre)
				g_free (src->iradio_genre);
			src->iradio_genre = g_strdup (value);
			g_object_notify (G_OBJECT (src), "iradio-genre");
                } else if (!strncmp (key, "url", 3)) {
			if (src->iradio_url)
				g_free (src->iradio_url);
			src->iradio_url = g_strdup (value);
			g_object_notify (G_OBJECT (src), "iradio-url");
		}
        }
}

static void
gst_gnomevfssrc_push_callbacks (GstGnomeVFSSrc *gnomevfssrc)
{
	if (gnomevfssrc->iradio_callbacks_pushed)
		return;

	GST_DEBUG (0,"pushing callbacks");
	gnome_vfs_module_callback_push (GNOME_VFS_MODULE_CALLBACK_HTTP_SEND_ADDITIONAL_HEADERS,
					gst_gnomevfssrc_send_additional_headers_callback,
					gnomevfssrc,
					NULL);
	gnome_vfs_module_callback_push (GNOME_VFS_MODULE_CALLBACK_HTTP_RECEIVED_HEADERS,
					gst_gnomevfssrc_received_headers_callback,
					gnomevfssrc,
					NULL);

	gnomevfssrc->iradio_callbacks_pushed = TRUE;
}

static void
gst_gnomevfssrc_pop_callbacks (GstGnomeVFSSrc *gnomevfssrc)
{
	if (!gnomevfssrc->iradio_callbacks_pushed)
		return;

	GST_DEBUG (0,"popping callbacks");
	gnome_vfs_module_callback_pop (GNOME_VFS_MODULE_CALLBACK_HTTP_SEND_ADDITIONAL_HEADERS);
	gnome_vfs_module_callback_pop (GNOME_VFS_MODULE_CALLBACK_HTTP_RECEIVED_HEADERS);
}

static void
gst_gnomevfssrc_get_icy_metadata (GstGnomeVFSSrc *src)
{
	GnomeVFSFileSize length = 0;
        GnomeVFSResult res;
        gint metadata_length;
        guchar foobyte;
        guchar *data;
        guchar *pos;
	gchar **tags;
	int i;

	GST_DEBUG (0,"reading icecast metadata");

        while (length == 0) {
                res = gnome_vfs_read (src->handle, &foobyte, 1, &length);
                if (res != GNOME_VFS_OK)
                        return;
        }

        metadata_length = foobyte * 16;

        if (metadata_length == 0)
                return;

	data = g_new (gchar, metadata_length + 1);
        pos = data;

        while (pos - data < metadata_length) {
                res = gnome_vfs_read (src->handle, pos,
                                      metadata_length - (pos - data),
                                      &length);
		/* FIXME: better error handling here? */
                if (res != GNOME_VFS_OK) {
                        g_free (data);
                        return;
                }

                pos += length;
        }

        data[metadata_length] = 0;
	tags = g_strsplit(data, "';", 0);
	
	for (i = 0; tags[i]; i++)
	{
		if (!g_strncasecmp(tags[i], "StreamTitle=", 12))
		{
			if (src->iradio_title)
				g_free (src->iradio_title);
			src->iradio_title = g_strdup(tags[i]+13);
			GST_DEBUG(0, "sending notification on icecast title");
			g_object_notify (G_OBJECT (src), "iradio-title");
		}
		if (!g_strncasecmp(tags[i], "StreamUrl=", 10))
		{
			if (src->iradio_url)
				g_free (src->iradio_url);
			src->iradio_url = g_strdup(tags[i]+11);
			GST_DEBUG(0, "sending notification on icecast url");
			g_object_notify (G_OBJECT (src), "iradio-url");
		}
	}

	g_strfreev(tags);
}

/* end of icecast/audiocast metadata extraction support code */

/**
 * gst_gnomevfssrc_get:
 * @pad: #GstPad to push a buffer from
 *
 * Push a new buffer from the gnomevfssrc at the current offset.
 */
static GstBuffer *gst_gnomevfssrc_get(GstPad *pad)
{
	GstGnomeVFSSrc *src;
	GnomeVFSResult result = 0;
	GstBuffer *buf;
	GnomeVFSFileSize readbytes;

	g_return_val_if_fail(pad != NULL, NULL);
	src = GST_GNOMEVFSSRC(gst_pad_get_parent(pad));
	g_return_val_if_fail(GST_FLAG_IS_SET(src, GST_GNOMEVFSSRC_OPEN),
			     NULL);

	/* deal with EOF state */
	if ((src->curoffset >= src->size) && (src->size != 0))
	{
		gst_element_set_eos (GST_ELEMENT (src));
		return GST_BUFFER (gst_event_new (GST_EVENT_EOS));
	}

	/* create the buffer */
	/* FIXME: should eventually use a bufferpool for this */
	buf = gst_buffer_new();
	g_return_val_if_fail(buf, NULL);

	audiocast_do_notifications(src);

	/* read it in from the file */
	if (src->is_local)
	{
		/* simply set the buffer to point to the correct region of the
		 * file */
		GST_BUFFER_DATA (buf) = src->map + src->curoffset;
		GST_BUFFER_OFFSET (buf) = src->curoffset;
		GST_BUFFER_FLAG_SET (buf, GST_BUFFER_DONTFREE);
		GST_BUFFER_FLAG_SET (buf, GST_BUFFER_READONLY);

		if ((src->curoffset + src->bytes_per_read) > src->size)
		{
			GST_BUFFER_SIZE (buf) = src->size - src->curoffset;
		} else {
			GST_BUFFER_SIZE (buf) = src->bytes_per_read;
		}

		if (src->new_seek)
		{
			GstEvent *event;

			gst_buffer_unref (buf);
			GST_DEBUG (0,"new seek %lld", src->curoffset);
			src->new_seek = FALSE;

			GST_DEBUG (GST_CAT_EVENT, "gnomevfssrc sending discont");
			event = gst_event_new_discontinuous (FALSE, GST_FORMAT_BYTES, src->curoffset, NULL);
			src->need_flush = FALSE;
			return GST_BUFFER (event);
		}

		src->curoffset += GST_BUFFER_SIZE (buf);

                g_object_notify ((GObject*) src, "offset");
	} else if (src->iradio_mode && src->icy_metaint > 0) {
		GST_BUFFER_DATA (buf) = g_malloc0 (src->icy_metaint);
		g_return_val_if_fail (GST_BUFFER_DATA (buf) != NULL, NULL);

		result = gnome_vfs_read (src->handle, GST_BUFFER_DATA (buf),
					 src->icy_metaint - src->icy_count,
					 &readbytes);

		/* EOS? */
		if (readbytes == 0) {
			gst_buffer_unref (buf);
			gst_element_set_eos (GST_ELEMENT (src));

			return GST_BUFFER (gst_event_new (GST_EVENT_EOS));
		}

		src->icy_count += readbytes;
		GST_BUFFER_OFFSET (buf) = src->curoffset;
		GST_BUFFER_SIZE (buf) = readbytes;
		src->curoffset += readbytes;

		if (src->icy_count == src->icy_metaint) {
			gst_gnomevfssrc_get_icy_metadata (src);
			src->icy_count = 0;
		}

		g_object_notify (G_OBJECT (src), "offset");
	} else {
		/* allocate the space for the buffer data */
		GST_BUFFER_DATA(buf) = g_malloc(src->bytes_per_read);
		g_return_val_if_fail(GST_BUFFER_DATA(buf) != NULL, NULL);

		if (src->new_seek)
		{
			GstEvent *event;

			gst_buffer_unref (buf);
			GST_DEBUG (0,"new seek %lld", src->curoffset);
			src->new_seek = FALSE;

			GST_DEBUG (GST_CAT_EVENT, "gnomevfssrc sending discont");
			event = gst_event_new_discontinuous (FALSE, GST_FORMAT_BYTES, src->curoffset, NULL);
			src->need_flush = FALSE;

			return GST_BUFFER (event);
		}

		result = gnome_vfs_read(src->handle, GST_BUFFER_DATA(buf),
				   src->bytes_per_read, &readbytes);

		GST_DEBUG(0, "read: %s, readbytes: %Lu",
				gnome_vfs_result_to_string(result), readbytes);
		/* deal with EOS */
		if (readbytes == 0)
		{
			gst_buffer_unref(buf);

			gst_element_set_eos (GST_ELEMENT (src));

			return GST_BUFFER (gst_event_new (GST_EVENT_EOS));
		}
		
		GST_BUFFER_OFFSET(buf) = src->curoffset;
		GST_BUFFER_SIZE(buf) = readbytes;
		src->curoffset += readbytes;
                g_object_notify ((GObject*) src, "offset");
	}

	GST_BUFFER_TIMESTAMP (buf) = -1;

	/* we're done, return the buffer */
	return buf;
}

/* open the file and mmap it, necessary to go to READY state */
static gboolean gst_gnomevfssrc_open_file(GstGnomeVFSSrc *src)
{
	GnomeVFSResult result;

	g_return_val_if_fail(!GST_FLAG_IS_SET(src, GST_GNOMEVFSSRC_OPEN),
			     FALSE);

	/* create the uri */
	src->uri = gnome_vfs_uri_new(src->filename);
	if (!src->uri) {
		gst_element_error(GST_ELEMENT(src),
				  "creating uri \"%s\" (%s)",
				  	src->filename, strerror (errno));
		return FALSE;
	}

	/* open the file using open() if the file is local */
	src->is_local = gnome_vfs_uri_is_local(src->uri);

	if (src->is_local) {
		src->local_name =
			gnome_vfs_get_local_path_from_uri(src->filename);
		src->fd = open(src->local_name, O_RDONLY);
		if (src->fd < 0)
		{
			gst_element_error(GST_ELEMENT(src),
					  "opening local file \"%s\" (%s)",
						src->filename, strerror (errno));
			return FALSE;
		}

		/* find the file length */
		src->size = lseek (src->fd, 0, SEEK_END);
		lseek (src->fd, 0, SEEK_SET);
		src->map = mmap (NULL, src->size, PROT_READ, MAP_SHARED,
				src->fd, 0);
		madvise (src->map,src->size, 2);
		/* collapse state if that failed */
		if (src->map == NULL)
		{
			gst_gnomevfssrc_close_file(src);
			gst_element_error (GST_ELEMENT (src),"mmapping file");
			return FALSE;
		}

                g_object_notify (G_OBJECT (src), "filesize");

		src->new_seek = TRUE;
	} else {

		if (!audiocast_init(src))
			return FALSE;
			
		gst_gnomevfssrc_push_callbacks (src);

		result =
		    gnome_vfs_open_uri(&(src->handle), src->uri,
				       GNOME_VFS_OPEN_READ);
		if (result != GNOME_VFS_OK)
		{
			gst_gnomevfssrc_pop_callbacks (src);
			audiocast_thread_kill(src);
			gst_element_error(GST_ELEMENT(src),
				  "opening vfs file \"%s\" (%s)",
				      src->filename, 
				      gnome_vfs_result_to_string(result));
			return FALSE;
		}

		/* find the file length */
		{
			GnomeVFSResult size_result;
			GnomeVFSFileInfo *info;

			info = gnome_vfs_file_info_new ();
			size_result = gnome_vfs_get_file_info_uri(src->uri,
					info, GNOME_VFS_FILE_INFO_DEFAULT);

			if (size_result != GNOME_VFS_OK)
				src->size = 0;
			else
				src->size = info->size;

		        GST_DEBUG(0, "size %lld", src->size);
                        g_object_notify (G_OBJECT (src), "filesize");

			gnome_vfs_file_info_unref(info);
		}

		audiocast_do_notifications(src);
	
		GST_DEBUG(0, "open %s", gnome_vfs_result_to_string(result));
	}

	GST_FLAG_SET(src, GST_GNOMEVFSSRC_OPEN);

	return TRUE;
}

/* unmap and close the file */
static void gst_gnomevfssrc_close_file(GstGnomeVFSSrc *src)
{
	g_return_if_fail(GST_FLAG_IS_SET(src, GST_GNOMEVFSSRC_OPEN));

	gst_gnomevfssrc_pop_callbacks (src);
	audiocast_thread_kill(src);

	/* close the file */
	if (src->is_local)
	{
		/* unmap the file from memory */
		munmap (src->map, src->size);
		close(src->fd);
	} else {
		gnome_vfs_close(src->handle);
	}

	/* zero out a lot of our state */
	src->is_local = FALSE;
	gnome_vfs_uri_unref(src->uri);
	g_free(src->local_name);
	src->fd = 0;
	src->map = NULL;
	src->size = 0;
	src->curoffset = 0;
	src->new_seek = FALSE;

	GST_FLAG_UNSET(src, GST_GNOMEVFSSRC_OPEN);
}

static GstElementStateReturn gst_gnomevfssrc_change_state(GstElement *element)
{
	g_return_val_if_fail(GST_IS_GNOMEVFSSRC(element),
			     GST_STATE_FAILURE);

	switch (GST_STATE_TRANSITION (element)) {
	case GST_STATE_READY_TO_PAUSED:
		if (!GST_FLAG_IS_SET(element, GST_GNOMEVFSSRC_OPEN)) {
			if (!gst_gnomevfssrc_open_file
					(GST_GNOMEVFSSRC(element)))
				return GST_STATE_FAILURE;
		}
		break;
	case GST_STATE_PAUSED_TO_READY:
		if (GST_FLAG_IS_SET(element, GST_GNOMEVFSSRC_OPEN))
			gst_gnomevfssrc_close_file(GST_GNOMEVFSSRC
					(element));
		break;
	case GST_STATE_NULL_TO_READY:
	case GST_STATE_READY_TO_NULL:
	default:
		break;
	}

	if (GST_ELEMENT_CLASS(parent_class)->change_state)
		return GST_ELEMENT_CLASS(parent_class)->
		    change_state(element);

	return GST_STATE_SUCCESS;
}

static gboolean plugin_init(GModule *module, GstPlugin *plugin)
{
	GstElementFactory *factory;

	/* create an elementfactory for the aasink element */
	factory =
	    gst_element_factory_new("gnomevfssrc", GST_TYPE_GNOMEVFSSRC,
				   &gst_gnomevfssrc_details);
	g_return_val_if_fail(factory != NULL, FALSE);

	gst_plugin_add_feature (plugin, GST_PLUGIN_FEATURE (factory));

	return TRUE;
}


static gboolean
gst_gnomevfssrc_srcpad_query (GstPad *pad, GstPadQueryType type,
		              GstFormat *format, gint64 *value)
{
	GstGnomeVFSSrc *src = GST_GNOMEVFSSRC (gst_pad_get_parent (pad));

	switch (type) {
	case GST_PAD_QUERY_TOTAL:
		if (*format != GST_FORMAT_BYTES) {
			return FALSE;
		}
		*value = src->size;
		break;
	case GST_PAD_QUERY_POSITION:
		if (*format != GST_FORMAT_BYTES) {
			return FALSE;
		}
		*value = src->curoffset;
		break;
	default:
		return FALSE;
		break;
	}
	return TRUE;
} 

static gboolean
gst_gnomevfssrc_srcpad_event (GstPad *pad, GstEvent *event)
{
	GstGnomeVFSSrc *src = GST_GNOMEVFSSRC(GST_PAD_PARENT(pad));

	switch (GST_EVENT_TYPE (event)) {
	case GST_EVENT_SEEK:
        {
		gint64 desired_offset;

		if (GST_EVENT_SEEK_FORMAT (event) != GST_FORMAT_BYTES) {
			gst_event_unref (event);
			return FALSE;
		}
		switch (GST_EVENT_SEEK_METHOD (event)) {
		case GST_SEEK_METHOD_SET:
			desired_offset = (guint64) GST_EVENT_SEEK_OFFSET (event);
			break;
		case GST_SEEK_METHOD_CUR:
			desired_offset = src->curoffset + GST_EVENT_SEEK_OFFSET (event);
			break;
		case GST_SEEK_METHOD_END:
			desired_offset = src->size - ABS (GST_EVENT_SEEK_OFFSET (event));
			break;
		default:
			gst_event_unref (event);
			return FALSE;
			break;
		}
		if (!src->is_local) {
			GnomeVFSResult result;

			result = gnome_vfs_seek(src->handle,
					GNOME_VFS_SEEK_START, desired_offset);
			GST_DEBUG(0, "new_seek: %s",
					gnome_vfs_result_to_string(result));
			
			if (result != GNOME_VFS_OK) {
				gst_event_unref (event);
				return FALSE;
			}
		}
		src->curoffset = desired_offset;
		src->new_seek = TRUE;
		src->need_flush = GST_EVENT_SEEK_FLAGS (event) & GST_SEEK_FLAG_FLUSH;
		g_object_notify (G_OBJECT (src), "offset");
		break;
	}
	case GST_EVENT_SIZE:
		if (GST_EVENT_SIZE_FORMAT (event) != GST_FORMAT_BYTES) {
			gst_event_unref (event);
			return FALSE;
		}
		src->bytes_per_read = GST_EVENT_SIZE_VALUE (event);
		g_object_notify (G_OBJECT (src), "bytesperread");
		break;

	case GST_EVENT_FLUSH:
		src->need_flush = TRUE;
		break;
	default:
		gst_event_unref (event);
		return FALSE;
		break;
	}
	gst_event_unref (event);

	return TRUE;
}

GstPluginDesc plugin_desc = {
	GST_VERSION_MAJOR,
	GST_VERSION_MINOR,
	"gnomevfssrc",
	plugin_init
};

/*
  Local Variables:
  c-file-style: "linux"
  End:
*/