/* 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 //#define DEBUG_ENABLED #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 void gst_disksrc_push (GstSrc *src); 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; gstsrc_class->push = gst_disksrc_push; /* we nominally can't (won't) do async */ gstsrc_class->push_region = NULL; } static void gst_disksrc_init(GstDiskSrc *disksrc) { disksrc->srcpad = gst_pad_new("src",GST_PAD_SRC); 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; } } void gst_disksrc_push(GstSrc *src) { GstDiskSrc *disksrc; GstBuffer *buf; glong readbytes; g_return_if_fail(src != NULL); g_return_if_fail(GST_IS_DISKSRC(src)); g_return_if_fail(GST_FLAG_IS_SET(src,GST_DISKSRC_OPEN)); g_return_if_fail(GST_STATE(src) >= GST_STATE_READY); disksrc = GST_DISKSRC(src); /* 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(disksrc->bytes_per_read); g_return_if_fail(GST_BUFFER_DATA(buf) != NULL); /* read it in from the file */ readbytes = read(disksrc->fd,GST_BUFFER_DATA(buf),disksrc->bytes_per_read); if (readbytes == -1) { perror("read()"); gst_buffer_unref(buf); return; } else if (readbytes == 0) { gst_src_signal_eos(GST_SRC(disksrc)); gst_buffer_unref(buf); return; } /* if we didn't get as many bytes as we asked for, we're at EOF */ if (readbytes < disksrc->bytes_per_read) GST_BUFFER_FLAG_SET(buf, GST_BUFFER_EOS); /* if we have a new buffer froma seek, mark it */ if (disksrc->new_seek) { GST_BUFFER_FLAG_SET(buf, GST_BUFFER_FLUSH); disksrc->new_seek = FALSE; } GST_BUFFER_OFFSET(buf) = disksrc->curoffset; GST_BUFFER_SIZE(buf) = readbytes; disksrc->curoffset += readbytes; DEBUG("pushing with offset %d\n", GST_BUFFER_OFFSET(buf)); /* we're done, push the buffer off now */ gst_pad_push(disksrc->srcpad,buf); DEBUG("pushing with offset %d done\n", GST_BUFFER_OFFSET(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; }