2000-12-29 05:38:06 +00:00
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/* GStreamer
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* Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
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* 2000 Wim Taymans <wtay@chello.be>
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*
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* gstpipefilter.c:
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2000-05-28 20:04:31 +00:00
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <errno.h>
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//#define DEBUG_ENABLED
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#include "gstpipefilter.h"
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GstElementDetails gst_pipefilter_details = {
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"Pipefilter",
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"Filter",
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"Pass data without modification",
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VERSION,
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2001-05-20 14:12:36 +00:00
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"Erik Walthinsen <omega@cse.ogi.edu>\n"
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"Wim Taymans <wim.taymans@chello.be>",
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2000-05-28 20:04:31 +00:00
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"(C) 1999",
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};
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/* Pipefilter signals and args */
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enum {
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/* FILL ME */
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LAST_SIGNAL
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};
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enum {
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ARG_0,
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2000-05-28 22:46:46 +00:00
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ARG_COMMAND
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2000-05-28 20:04:31 +00:00
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};
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2001-05-20 14:12:36 +00:00
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static void gst_pipefilter_class_init (GstPipefilterClass *klass);
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static void gst_pipefilter_init (GstPipefilter *pipefilter);
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2000-05-28 20:04:31 +00:00
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2001-06-25 01:20:11 +00:00
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static void gst_pipefilter_set_property (GObject *object, guint prop_id, const GValue *value, GParamSpec *pspec);
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static void gst_pipefilter_get_property (GObject *object, guint prop_id, GValue *value, GParamSpec *pspec);
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2000-05-28 20:04:31 +00:00
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2001-05-20 14:12:36 +00:00
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static GstBuffer* gst_pipefilter_get (GstPad *pad);
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static void gst_pipefilter_chain (GstPad *pad, GstBuffer *buf);
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static gboolean gst_pipefilter_handle_eos (GstPad *pad);
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static GstElementStateReturn gst_pipefilter_change_state (GstElement *element);
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2000-05-28 20:04:31 +00:00
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2000-12-29 02:28:04 +00:00
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static GstElementClass *parent_class = NULL;
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2000-05-28 20:04:31 +00:00
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//static guint gst_pipefilter_signals[LAST_SIGNAL] = { 0 };
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2001-06-25 01:20:11 +00:00
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GType
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2001-05-20 14:12:36 +00:00
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gst_pipefilter_get_type (void)
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{
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2001-06-25 01:20:11 +00:00
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static GType pipefilter_type = 0;
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2000-05-28 20:04:31 +00:00
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if (!pipefilter_type) {
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2001-06-25 01:20:11 +00:00
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static const GTypeInfo pipefilter_info = {
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sizeof(GstPipefilterClass), NULL,
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NULL,
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(GClassInitFunc)gst_pipefilter_class_init,
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NULL,
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NULL,
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2000-05-28 20:04:31 +00:00
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sizeof(GstPipefilter),
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2001-06-25 01:20:11 +00:00
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0,
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(GInstanceInitFunc)gst_pipefilter_init,
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2000-05-28 20:04:31 +00:00
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};
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2001-06-25 01:20:11 +00:00
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pipefilter_type = g_type_register_static(GST_TYPE_ELEMENT, "GstPipefilter", &pipefilter_info, 0);
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2000-05-28 20:04:31 +00:00
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}
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return pipefilter_type;
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}
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2001-05-20 14:12:36 +00:00
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static void
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gst_pipefilter_class_init (GstPipefilterClass *klass)
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{
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2001-06-25 01:20:11 +00:00
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GObjectClass *gobject_class;
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2000-05-28 20:04:31 +00:00
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GstElementClass *gstelement_class;
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2001-06-25 01:20:11 +00:00
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gobject_class = (GObjectClass*)klass;
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2000-05-28 20:04:31 +00:00
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gstelement_class = (GstElementClass*)klass;
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2001-06-25 01:20:11 +00:00
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parent_class = g_type_class_ref(GST_TYPE_ELEMENT);
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2000-05-28 20:04:31 +00:00
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gstelement_class->change_state = gst_pipefilter_change_state;
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2001-06-25 01:20:11 +00:00
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g_object_class_install_property(G_OBJECT_CLASS(klass), ARG_COMMAND,
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g_param_spec_string("command","command","command",
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NULL, G_PARAM_READWRITE)); // CHECKME
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2000-05-28 20:04:31 +00:00
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2001-06-25 01:20:11 +00:00
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gobject_class->set_property = gst_pipefilter_set_property;
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gobject_class->get_property = gst_pipefilter_get_property;
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2000-05-28 20:04:31 +00:00
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}
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2001-05-20 14:12:36 +00:00
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static void
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gst_pipefilter_init (GstPipefilter *pipefilter)
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{
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GST_FLAG_SET (pipefilter, GST_ELEMENT_DECOUPLED);
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pipefilter->sinkpad = gst_pad_new ("sink", GST_PAD_SINK);
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gst_element_add_pad (GST_ELEMENT (pipefilter), pipefilter->sinkpad);
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gst_pad_set_chain_function (pipefilter->sinkpad, gst_pipefilter_chain);
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gst_pad_set_eos_function (pipefilter->sinkpad, gst_pipefilter_handle_eos);
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pipefilter->srcpad = gst_pad_new ("src", GST_PAD_SRC);
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gst_element_add_pad (GST_ELEMENT (pipefilter), pipefilter->srcpad);
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gst_pad_set_get_function (pipefilter->srcpad, gst_pipefilter_get);
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2000-05-28 20:04:31 +00:00
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2000-05-28 22:46:46 +00:00
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pipefilter->command = NULL;
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2000-05-28 20:04:31 +00:00
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pipefilter->curoffset = 0;
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pipefilter->bytes_per_read = 4096;
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pipefilter->seq = 0;
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}
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2001-05-20 14:12:36 +00:00
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static gboolean
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gst_pipefilter_handle_eos (GstPad *pad)
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{
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GstPipefilter *pipefilter;
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pipefilter = GST_PIPEFILTER (gst_pad_get_parent (pad));
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GST_DEBUG (0,"pipefilter: %s received eos\n", GST_ELEMENT_NAME (pipefilter));
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if (close (pipefilter->fdin[1]) < 0)
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perror("close");
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if (close (pipefilter->fdout[0]) < 0)
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perror("close");
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GST_FLAG_SET (pad, GST_PAD_EOS);
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return TRUE;
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}
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static GstBuffer*
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gst_pipefilter_get (GstPad *pad)
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{
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GstPipefilter *pipefilter;
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2000-06-11 12:11:41 +00:00
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GstBuffer *newbuf;
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glong readbytes;
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2000-05-28 20:04:31 +00:00
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2001-05-20 14:12:36 +00:00
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pipefilter = GST_PIPEFILTER (gst_pad_get_parent (pad));
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2000-05-28 20:04:31 +00:00
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/* create the buffer */
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// FIXME: should eventually use a bufferpool for this
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newbuf = gst_buffer_new();
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2001-05-20 14:12:36 +00:00
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g_return_val_if_fail(newbuf, NULL);
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2000-05-28 20:04:31 +00:00
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/* allocate the space for the buffer data */
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GST_BUFFER_DATA(newbuf) = g_malloc(pipefilter->bytes_per_read);
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2001-05-20 14:12:36 +00:00
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g_return_val_if_fail(GST_BUFFER_DATA(newbuf) != NULL, NULL);
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2000-05-28 20:04:31 +00:00
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/* read it in from the file */
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2001-01-01 03:14:40 +00:00
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GST_DEBUG (0,"attemting to read %ld bytes\n", pipefilter->bytes_per_read);
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2001-05-20 14:12:36 +00:00
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readbytes = read(pipefilter->fdout[0], GST_BUFFER_DATA(newbuf), pipefilter->bytes_per_read);
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2001-01-01 03:14:40 +00:00
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GST_DEBUG (0,"read %ld bytes\n", readbytes);
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2000-05-28 20:04:31 +00:00
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if (readbytes < 0) {
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2001-05-20 14:12:36 +00:00
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perror("read");
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gst_element_error(GST_ELEMENT(pipefilter),"reading");
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return NULL;
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2000-05-28 20:04:31 +00:00
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}
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2001-05-20 14:12:36 +00:00
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/* if we didn't get as many bytes as we asked for, we're at EOF */
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2000-05-28 20:04:31 +00:00
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if (readbytes == 0) {
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2001-05-20 14:12:36 +00:00
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gst_pad_set_eos (pad);
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return NULL;
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2000-05-28 20:04:31 +00:00
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}
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2001-05-20 14:12:36 +00:00
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2000-05-28 20:04:31 +00:00
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GST_BUFFER_OFFSET(newbuf) = pipefilter->curoffset;
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GST_BUFFER_SIZE(newbuf) = readbytes;
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pipefilter->curoffset += readbytes;
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2001-05-20 14:12:36 +00:00
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return newbuf;
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2000-06-11 12:11:41 +00:00
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}
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2001-05-20 14:12:36 +00:00
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static void
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gst_pipefilter_chain (GstPad *pad,GstBuffer *buf)
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{
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2000-06-11 12:11:41 +00:00
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GstPipefilter *pipefilter;
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glong writebytes;
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guchar *data;
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gulong size;
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g_return_if_fail(pad != NULL);
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g_return_if_fail(GST_IS_PAD(pad));
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g_return_if_fail(buf != NULL);
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2001-01-29 00:06:02 +00:00
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pipefilter = GST_PIPEFILTER (gst_pad_get_parent (pad));
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2000-06-11 12:11:41 +00:00
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data = GST_BUFFER_DATA(buf);
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size = GST_BUFFER_SIZE(buf);
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2001-01-01 03:14:40 +00:00
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GST_DEBUG (0,"attemting to write %ld bytes\n", size);
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2000-06-11 12:11:41 +00:00
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writebytes = write(pipefilter->fdin[1],data,size);
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2001-01-01 03:14:40 +00:00
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GST_DEBUG (0,"written %ld bytes\n", writebytes);
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2000-06-11 12:11:41 +00:00
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if (writebytes < 0) {
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perror("write");
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gst_element_error(GST_ELEMENT(pipefilter),"writing");
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return;
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}
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gst_buffer_unref(buf);
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2000-05-28 20:04:31 +00:00
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}
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2001-05-20 14:12:36 +00:00
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static void
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2001-06-25 01:20:11 +00:00
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gst_pipefilter_set_property (GObject *object, guint prop_id, const GValue *value, GParamSpec *pspec)
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2001-05-20 14:12:36 +00:00
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{
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2000-05-28 20:04:31 +00:00
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GstPipefilter *pipefilter;
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/* it's not null if we got it, but it might not be ours */
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g_return_if_fail(GST_IS_PIPEFILTER(object));
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pipefilter = GST_PIPEFILTER(object);
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2001-06-25 01:20:11 +00:00
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switch (prop_id) {
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2000-05-28 22:46:46 +00:00
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case ARG_COMMAND:
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2001-06-25 01:20:11 +00:00
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pipefilter->orig_command = g_strdup(g_value_get_string (value));
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pipefilter->command = g_strsplit(g_value_get_string (value), " ", 0);
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2000-05-28 20:04:31 +00:00
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break;
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default:
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break;
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}
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}
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2001-05-20 14:12:36 +00:00
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static void
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2001-06-25 01:20:11 +00:00
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gst_pipefilter_get_property (GObject *object, guint prop_id, GValue *value, GParamSpec *pspec)
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2001-05-20 14:12:36 +00:00
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{
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2000-05-28 20:04:31 +00:00
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GstPipefilter *pipefilter;
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/* it's not null if we got it, but it might not be ours */
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g_return_if_fail(GST_IS_PIPEFILTER(object));
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pipefilter = GST_PIPEFILTER(object);
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2001-06-25 01:20:11 +00:00
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switch (prop_id) {
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2000-05-28 22:46:46 +00:00
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case ARG_COMMAND:
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2001-06-25 01:20:11 +00:00
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g_value_set_string (value, pipefilter->orig_command);
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2000-05-28 20:04:31 +00:00
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break;
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default:
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2001-06-25 01:20:11 +00:00
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
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2000-05-28 20:04:31 +00:00
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break;
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}
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}
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/* open the file, necessary to go to RUNNING state */
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2001-05-20 14:12:36 +00:00
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static gboolean
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gst_pipefilter_open_file (GstPipefilter *src)
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{
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2000-05-28 20:04:31 +00:00
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g_return_val_if_fail(!GST_FLAG_IS_SET(src,GST_PIPEFILTER_OPEN), FALSE);
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pipe(src->fdin);
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pipe(src->fdout);
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if((src->childpid = fork()) == -1)
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{
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perror("fork");
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gst_element_error(GST_ELEMENT(src),"forking");
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return FALSE;
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}
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if(src->childpid == 0)
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{
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2001-05-20 14:12:36 +00:00
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close(src->fdin[1]);
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close(src->fdout[0]);
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2000-05-28 22:46:46 +00:00
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// child
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dup2(src->fdin[0], STDIN_FILENO); /* set the childs input stream */
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dup2(src->fdout[1], STDOUT_FILENO); /* set the childs output stream */
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execvp(src->command[0], &src->command[0]);
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// will only reach if error
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perror("exec");
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gst_element_error(GST_ELEMENT(src),"starting child process");
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return FALSE;
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2000-05-28 20:04:31 +00:00
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}
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2001-05-20 14:12:36 +00:00
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else {
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close(src->fdin[0]);
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close(src->fdout[1]);
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}
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2000-05-28 20:04:31 +00:00
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GST_FLAG_SET(src,GST_PIPEFILTER_OPEN);
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return TRUE;
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}
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/* close the file */
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2001-05-20 14:12:36 +00:00
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static void
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gst_pipefilter_close_file (GstPipefilter *src)
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{
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2000-05-28 20:04:31 +00:00
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g_return_if_fail(GST_FLAG_IS_SET(src,GST_PIPEFILTER_OPEN));
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/* close the file */
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close(src->fdout[0]);
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close(src->fdout[1]);
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close(src->fdin[0]);
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close(src->fdin[1]);
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/* zero out a lot of our state */
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src->curoffset = 0;
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src->seq = 0;
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GST_FLAG_UNSET(src,GST_PIPEFILTER_OPEN);
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}
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2001-05-20 14:12:36 +00:00
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static GstElementStateReturn
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gst_pipefilter_change_state (GstElement *element)
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{
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2000-05-28 20:04:31 +00:00
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g_return_val_if_fail(GST_IS_PIPEFILTER(element), FALSE);
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2000-07-21 03:57:51 +00:00
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/* if going down into NULL state, close the file if it's open */
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if (GST_STATE_PENDING(element) == GST_STATE_NULL) {
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if (GST_FLAG_IS_SET(element,GST_PIPEFILTER_OPEN))
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2000-05-28 20:04:31 +00:00
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gst_pipefilter_close_file(GST_PIPEFILTER(element));
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2000-07-21 03:57:51 +00:00
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/* otherwise (READY or higher) we need to open the file */
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} else {
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if (!GST_FLAG_IS_SET(element,GST_PIPEFILTER_OPEN)) {
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2000-08-14 10:55:35 +00:00
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if (!gst_pipefilter_open_file(GST_PIPEFILTER(element)))
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2000-07-21 03:57:51 +00:00
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return GST_STATE_FAILURE;
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}
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}
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2000-05-28 20:04:31 +00:00
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if (GST_ELEMENT_CLASS(parent_class)->change_state)
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2000-07-21 03:57:51 +00:00
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return GST_ELEMENT_CLASS(parent_class)->change_state(element);
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2000-08-14 10:55:35 +00:00
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return GST_STATE_SUCCESS;
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2000-05-28 20:04:31 +00:00
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}
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