1 /* Gnome-Streamer
2 * Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
3 *
4 * This library is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Library General Public
6 * License as published by the Free Software Foundation; either
7 * version 2 of the License, or (at your option) any later version.
8 *
9 * This library is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Library General Public License for more details.
13 *
14 * You should have received a copy of the GNU Library General Public
15 * License along with this library; if not, write to the
16 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
17 * Boston, MA 02111-1307, USA.
18 */
20 #include <sys/types.h>
21 #include <sys/stat.h>
22 #include <fcntl.h>
24 #include <gstfdsrc.h>
27 GstElementDetails gst_fdsrc_details = {
28 "Disk Source",
29 "Source/File",
30 "Synchronous read from a file",
31 VERSION,
32 "Erik Walthinsen <omega@cse.ogi.edu>",
33 "(C) 1999",
34 };
37 /* FdSrc signals and args */
38 enum {
39 /* FILL ME */
40 LAST_SIGNAL
41 };
43 enum {
44 ARG_0,
45 ARG_LOCATION,
46 ARG_BYTESPERREAD,
47 ARG_OFFSET,
48 };
51 static void gst_fdsrc_class_init(GstFdSrcClass *klass);
52 static void gst_fdsrc_init(GstFdSrc *fdsrc);
53 static void gst_fdsrc_set_arg(GtkObject *object,GtkArg *arg,guint id);
54 static void gst_fdsrc_get_arg(GtkObject *object,GtkArg *arg,guint id);
56 static void gst_fdsrc_push(GstSrc *src);
57 static void gst_fdsrc_push_region(GstSrc *src,gulong offset,gulong size);
60 static GstSrcClass *parent_class = NULL;
61 static guint gst_fdsrc_signals[LAST_SIGNAL] = { 0 };
63 GtkType
64 gst_fdsrc_get_type(void) {
65 static GtkType fdsrc_type = 0;
67 if (!fdsrc_type) {
68 static const GtkTypeInfo fdsrc_info = {
69 "GstFdSrc",
70 sizeof(GstFdSrc),
71 sizeof(GstFdSrcClass),
72 (GtkClassInitFunc)gst_fdsrc_class_init,
73 (GtkObjectInitFunc)gst_fdsrc_init,
74 (GtkArgSetFunc)gst_fdsrc_set_arg,
75 (GtkArgGetFunc)gst_fdsrc_get_arg,
76 (GtkClassInitFunc)NULL,
77 };
78 fdsrc_type = gtk_type_unique(GST_TYPE_SRC,&fdsrc_info);
79 }
80 return fdsrc_type;
81 }
83 static void
84 gst_fdsrc_class_init(GstFdSrcClass *klass) {
85 GtkObjectClass *gtkobject_class;
86 GstSrcClass *gstsrc_class;
88 gtkobject_class = (GtkObjectClass*)klass;
89 gstsrc_class = (GstSrcClass*)klass;
91 parent_class = gtk_type_class(GST_TYPE_SRC);
93 gtk_object_add_arg_type("GstFdSrc::location", GTK_TYPE_STRING,
94 GTK_ARG_WRITABLE, ARG_LOCATION);
95 gtk_object_add_arg_type("GstFdSrc::bytesperread", GTK_TYPE_INT,
96 GTK_ARG_READWRITE, ARG_BYTESPERREAD);
97 gtk_object_add_arg_type("GstFdSrc::offset", GTK_TYPE_INT,
98 GTK_ARG_READWRITE, ARG_OFFSET);
100 gtkobject_class->set_arg = gst_fdsrc_set_arg;
101 gtkobject_class->get_arg = gst_fdsrc_get_arg;
103 gstsrc_class->push = gst_fdsrc_push;
104 /* we nominally can't (won't) do async */
105 gstsrc_class->push_region = NULL;
106 }
108 static void gst_fdsrc_init(GstFdSrc *fdsrc) {
109 fdsrc->srcpad = gst_pad_new("src",GST_PAD_SRC);
110 gst_element_add_pad(GST_ELEMENT(fdsrc),fdsrc->srcpad);
112 fdsrc->fd = 0;
113 fdsrc->curoffset = 0;
114 fdsrc->bytes_per_read = 4096;
115 fdsrc->seq = 0;
116 }
119 static void gst_fdsrc_set_arg(GtkObject *object,GtkArg *arg,guint id) {
120 GstFdSrc *src;
121 int fd;
123 /* it's not null if we got it, but it might not be ours */
124 g_return_if_fail(GST_IS_FDSRC(object));
125 src = GST_FDSRC(object);
127 switch(id) {
128 case ARG_LOCATION:
129 /* the element must be stopped in order to do this */
130 g_return_if_fail(!GST_FLAG_IS_SET(src,GST_STATE_RUNNING));
132 /* if we get a NULL, consider it to be a fd of 0 */
133 if (GTK_VALUE_STRING(*arg) == NULL) {
134 src->fd = 0;
135 gst_element_set_state(GST_ELEMENT(object),~GST_STATE_COMPLETE);
136 /* otherwise set the new filename */
137 } else {
138 if (sscanf(GTK_VALUE_STRING(*arg),"%d",&fd))
139 src->fd = fd;
140 gst_element_set_state(GST_ELEMENT(object),GST_STATE_COMPLETE);
141 }
142 break;
143 case ARG_BYTESPERREAD:
144 src->bytes_per_read = GTK_VALUE_INT(*arg);
145 break;
146 default:
147 break;
148 }
149 }
151 static void gst_fdsrc_get_arg(GtkObject *object,GtkArg *arg,guint id) {
152 GstFdSrc *src;
154 /* it's not null if we got it, but it might not be ours */
155 g_return_if_fail(GST_IS_FDSRC(object));
156 src = GST_FDSRC(object);
158 switch (id) {
159 case ARG_BYTESPERREAD:
160 GTK_VALUE_INT(*arg) = src->bytes_per_read;
161 break;
162 case ARG_OFFSET:
163 GTK_VALUE_INT(*arg) = src->curoffset;
164 break;
165 default:
166 arg->type = GTK_TYPE_INVALID;
167 break;
168 }
169 }
171 void gst_fdsrc_push(GstSrc *src) {
172 GstFdSrc *fdsrc;
173 GstBuffer *buf;
174 glong readbytes;
176 g_return_if_fail(src != NULL);
177 g_return_if_fail(GST_IS_FDSRC(src));
178 fdsrc = GST_FDSRC(src);
180 /* create the buffer */
181 // FIXME: should eventually use a bufferpool for this
182 buf = gst_buffer_new();
183 g_return_if_fail(buf);
185 /* allocate the space for the buffer data */
186 GST_BUFFER_DATA(buf) = g_malloc(fdsrc->bytes_per_read);
187 g_return_if_fail(GST_BUFFER_DATA(buf) != NULL);
189 /* read it in from the file */
190 readbytes = read(fdsrc->fd,GST_BUFFER_DATA(buf),fdsrc->bytes_per_read);
191 if (readbytes == 0) {
192 gst_src_signal_eos(GST_SRC(fdsrc));
193 return;
194 }
196 /* if we didn't get as many bytes as we asked for, we're at EOF */
197 if (readbytes < fdsrc->bytes_per_read) {
198 // FIXME: set the buffer's EOF bit here
199 }
200 GST_BUFFER_OFFSET(buf) = fdsrc->curoffset;
201 GST_BUFFER_SIZE(buf) = readbytes;
202 fdsrc->curoffset += readbytes;
204 /* we're done, push the buffer off now */
205 gst_pad_push(fdsrc->srcpad,buf);
206 }