/* Gnome-Streamer * Copyright (C) <1999> Erik Walthinsen * * 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 #include #include #include #include GstElementDetails gst_disksrc_details = { "Disk Source", "Source/File", "Synchronous read from a file", VERSION, "Erik Walthinsen ", "(C) 1999", }; /* DiskSrc signals and args */ enum { /* FILL ME */ LAST_SIGNAL }; enum { ARG_0, ARG_LOCATION, ARG_BYTESPERREAD, ARG_OFFSET, ARG_SIZE, }; static void gst_disksrc_class_init (GstDiskSrcClass *klass); static void gst_disksrc_init (GstDiskSrc *disksrc); static void gst_disksrc_set_arg (GtkObject *object, GtkArg *arg, guint id); static void gst_disksrc_get_arg (GtkObject *object, GtkArg *arg, guint id); static void gst_disksrc_close_file (GstDiskSrc *src); static GstBuffer * gst_disksrc_get (GstPad *pad); static GstElementStateReturn gst_disksrc_change_state (GstElement *element); static GstSrcClass *parent_class = NULL; //static guint gst_disksrc_signals[LAST_SIGNAL] = { 0 }; GtkType gst_disksrc_get_type(void) { static GtkType disksrc_type = 0; if (!disksrc_type) { static const GtkTypeInfo disksrc_info = { "GstDiskSrc", sizeof(GstDiskSrc), sizeof(GstDiskSrcClass), (GtkClassInitFunc)gst_disksrc_class_init, (GtkObjectInitFunc)gst_disksrc_init, (GtkArgSetFunc)gst_disksrc_set_arg, (GtkArgGetFunc)gst_disksrc_get_arg, (GtkClassInitFunc)NULL, }; disksrc_type = gtk_type_unique(GST_TYPE_SRC,&disksrc_info); } return disksrc_type; } static void gst_disksrc_class_init (GstDiskSrcClass *klass) { GtkObjectClass *gtkobject_class; GstElementClass *gstelement_class; GstSrcClass *gstsrc_class; gtkobject_class = (GtkObjectClass*)klass; gstelement_class = (GstElementClass*)klass; gstsrc_class = (GstSrcClass*)klass; parent_class = gtk_type_class (GST_TYPE_SRC); gtk_object_add_arg_type ("GstDiskSrc::location", GST_TYPE_FILENAME, GTK_ARG_READWRITE, ARG_LOCATION); gtk_object_add_arg_type ("GstDiskSrc::bytesperread", GTK_TYPE_INT, GTK_ARG_READWRITE, ARG_BYTESPERREAD); gtk_object_add_arg_type ("GstDiskSrc::offset", GTK_TYPE_INT, GTK_ARG_READABLE, ARG_OFFSET); gtk_object_add_arg_type ("GstDiskSrc::size", GTK_TYPE_INT, GTK_ARG_READABLE, ARG_SIZE); gtkobject_class->set_arg = gst_disksrc_set_arg; gtkobject_class->get_arg = gst_disksrc_get_arg; gstelement_class->change_state = gst_disksrc_change_state; } static void gst_disksrc_init (GstDiskSrc *disksrc) { disksrc->srcpad = gst_pad_new ("src", GST_PAD_SRC); gst_pad_set_get_function(disksrc->srcpad,gst_disksrc_get); gst_element_add_pad (GST_ELEMENT (disksrc), disksrc->srcpad); disksrc->filename = NULL; disksrc->fd = 0; disksrc->curoffset = 0; disksrc->bytes_per_read = 4096; disksrc->seq = 0; disksrc->size = 0; disksrc->new_seek = FALSE; } static void gst_disksrc_set_arg (GtkObject *object, GtkArg *arg, guint id) { GstDiskSrc *src; /* it's not null if we got it, but it might not be ours */ g_return_if_fail (GST_IS_DISKSRC (object)); src = GST_DISKSRC (object); switch(id) { case ARG_LOCATION: /* the element must not be playing in order to do this */ g_return_if_fail (GST_STATE(src) < GST_STATE_PLAYING); if (src->filename) g_free (src->filename); /* clear the filename if we get a NULL (is that possible?) */ if (GTK_VALUE_STRING (*arg) == NULL) { gst_element_set_state (GST_ELEMENT (object), GST_STATE_NULL); src->filename = NULL; /* otherwise set the new filename */ } else { src->filename = g_strdup (GTK_VALUE_STRING (*arg)); } break; case ARG_BYTESPERREAD: src->bytes_per_read = GTK_VALUE_INT (*arg); break; /* case ARG_OFFSET: src->curoffset = GTK_VALUE_INT(*arg); lseek(src->fd,src->curoffset, SEEK_SET); src->new_seek = TRUE; break; */ default: break; } } static void gst_disksrc_get_arg (GtkObject *object, GtkArg *arg, guint id) { GstDiskSrc *src; /* it's not null if we got it, but it might not be ours */ g_return_if_fail (GST_IS_DISKSRC (object)); src = GST_DISKSRC (object); switch (id) { case ARG_LOCATION: GTK_VALUE_STRING (*arg) = src->filename; break; case ARG_BYTESPERREAD: GTK_VALUE_INT (*arg) = src->bytes_per_read; break; case ARG_OFFSET: GTK_VALUE_INT (*arg) = src->curoffset; break; case ARG_SIZE: GTK_VALUE_INT (*arg) = src->size; break; default: arg->type = GTK_TYPE_INVALID; break; } } static GstBuffer * gst_disksrc_get (GstPad *pad) { GstDiskSrc *src; GstBuffer *buf; glong readbytes; g_return_if_fail (pad != NULL); src = GST_DISKSRC(gst_pad_get_parent(pad)); g_return_if_fail (GST_FLAG_IS_SET (src, GST_DISKSRC_OPEN)); g_return_if_fail (GST_STATE (src) >= GST_STATE_READY); /* create the buffer */ // FIXME: should eventually use a bufferpool for this buf = gst_buffer_new (); g_return_if_fail (buf); /* allocate the space for the buffer data */ GST_BUFFER_DATA (buf) = g_malloc (src->bytes_per_read); g_return_if_fail (GST_BUFFER_DATA (buf) != NULL); /* read it in from the file */ readbytes = read (src->fd, GST_BUFFER_DATA (buf), src->bytes_per_read); if (readbytes == -1) { perror ("read()"); gst_buffer_unref (buf); return; } else if (readbytes == 0) { gst_src_signal_eos (GST_SRC (src)); gst_buffer_unref (buf); return; } /* if we didn't get as many bytes as we asked for, we're at EOF */ if (readbytes < src->bytes_per_read) { GST_BUFFER_FLAG_SET (buf, GST_BUFFER_EOS); DEBUG("setting GST_BUFFER_EOS\n"); } /* if we have a new buffer from a seek, mark it */ if (src->new_seek) { GST_BUFFER_FLAG_SET (buf, GST_BUFFER_FLUSH); src->new_seek = FALSE; } GST_BUFFER_OFFSET (buf) = src->curoffset; GST_BUFFER_SIZE (buf) = readbytes; src->curoffset += readbytes; DEBUG("pushing %d bytes with offset %d\n", GST_BUFFER_SIZE(buf), GST_BUFFER_OFFSET (buf)); /* we're done, push the buffer off now */ DEBUG("returning %d bytes with offset %d done\n", GST_BUFFER_SIZE(buf), GST_BUFFER_OFFSET (buf)); return buf; } /* open the file, necessary to go to RUNNING state */ static gboolean gst_disksrc_open_file (GstDiskSrc *src) { struct stat f_stat; g_return_val_if_fail (!GST_FLAG_IS_SET (src, GST_DISKSRC_OPEN), FALSE); g_return_val_if_fail (src->filename != NULL, FALSE); /* open the file */ src->fd = open (src->filename, O_RDONLY); if (src->fd < 0) { perror ("open()"); gst_element_error (GST_ELEMENT (src), "opening file"); return FALSE; } if (fstat (src->fd, &f_stat) < 0) { perror("fstat()"); } else { src->size = f_stat.st_size; DEBUG("gstdisksrc: file size %ld\n", src->size); } GST_FLAG_SET (src, GST_DISKSRC_OPEN); return TRUE; } /* close the file */ static void gst_disksrc_close_file (GstDiskSrc *src) { g_return_if_fail (GST_FLAG_IS_SET (src, GST_DISKSRC_OPEN)); /* close the file */ close (src->fd); /* zero out a lot of our state */ src->fd = 0; src->curoffset = 0; src->seq = 0; src->size = 0; GST_FLAG_UNSET (src, GST_DISKSRC_OPEN); } static GstElementStateReturn gst_disksrc_change_state (GstElement *element) { g_return_val_if_fail (GST_IS_DISKSRC (element), GST_STATE_FAILURE); DEBUG("gstdisksrc: state pending %d\n", GST_STATE_PENDING (element)); /* if going down into NULL state, close the file if it's open */ if (GST_STATE_PENDING (element) == GST_STATE_NULL) { if (GST_FLAG_IS_SET (element, GST_DISKSRC_OPEN)) gst_disksrc_close_file (GST_DISKSRC (element)); /* otherwise (READY or higher) we need to open the file */ } else { if (!GST_FLAG_IS_SET (element, GST_DISKSRC_OPEN)) { if (!gst_disksrc_open_file (GST_DISKSRC (element))) return GST_STATE_FAILURE; } } /* if we haven't failed already, give the parent class a chance to ;-) */ if (GST_ELEMENT_CLASS (parent_class)->change_state) return GST_ELEMENT_CLASS (parent_class)->change_state (element); return GST_STATE_SUCCESS; }