gstreamer/gst/elements/gsthttpsrc.c

/* Gnome-Streamer
 * Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
 *
 * 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 <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <stdlib.h>
#include <unistd.h>

#include <gsthttpsrc.h>


GstElementDetails gst_httpsrc_details = {
  "HTTP Source",
  "Source/Network",
  "Read data from an HTTP stream",
  VERSION,
  "Erik Walthinsen <omega@cse.ogi.edu>",
  "(C) 1999",
};


static void gst_httpsrc_push(GstSrc *src);
static gboolean gst_httpsrc_open_url(GstHttpSrc *src);
static void gst_httpsrc_close_url(GstHttpSrc *src);
static GstElementStateReturn gst_httpsrc_change_state(GstElement *element);


/* HttpSrc signals and args */
enum {
  /* FILL ME */
  LAST_SIGNAL
};

enum {
  ARG_0,
  ARG_LOCATION,
  ARG_BYTESPERREAD,
  ARG_OFFSET
};


static void gst_httpsrc_class_init(GstHttpSrcClass *klass);
static void gst_httpsrc_init(GstHttpSrc *httpsrc);
static void gst_httpsrc_set_arg(GtkObject *object,GtkArg *arg,guint id);
static void gst_httpsrc_get_arg(GtkObject *object,GtkArg *arg,guint id);


static GstSrcClass *parent_class = NULL;
//static guint gst_httpsrc_signals[LAST_SIGNAL] = { 0 };

GtkType
gst_httpsrc_get_type(void) {
  static GtkType httpsrc_type = 0;

  if (!httpsrc_type) {
    static const GtkTypeInfo httpsrc_info = {
      "GstHttpSrc",
      sizeof(GstHttpSrc),
      sizeof(GstHttpSrcClass),
      (GtkClassInitFunc)gst_httpsrc_class_init,
      (GtkObjectInitFunc)gst_httpsrc_init,
      (GtkArgSetFunc)gst_httpsrc_set_arg,
      (GtkArgGetFunc)gst_httpsrc_get_arg,
      (GtkClassInitFunc)NULL,
    };
    httpsrc_type = gtk_type_unique(GST_TYPE_SRC,&httpsrc_info);
  }
  return httpsrc_type;
}

static void
gst_httpsrc_class_init(GstHttpSrcClass *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("GstHttpSrc::location", GTK_TYPE_STRING,
                          GTK_ARG_READWRITE, ARG_LOCATION);
  gtk_object_add_arg_type("GstHttpSrc::bytesperread", GTK_TYPE_INT,
                          GTK_ARG_READWRITE, ARG_BYTESPERREAD);

  gtkobject_class->set_arg = gst_httpsrc_set_arg;
  gtkobject_class->get_arg = gst_httpsrc_get_arg;

  gstelement_class->change_state = gst_httpsrc_change_state;

  gstsrc_class->push = gst_httpsrc_push;
  gstsrc_class->push_region = NULL;
}

static void gst_httpsrc_init(GstHttpSrc *httpsrc) {
  httpsrc->srcpad = gst_pad_new("src",GST_PAD_SRC);
  gst_element_add_pad(GST_ELEMENT(httpsrc),httpsrc->srcpad);

  httpsrc->url = NULL;
  httpsrc->request = NULL;
  httpsrc->fd = 0;
  httpsrc->curoffset = 0;
  httpsrc->bytes_per_read = 4096;
}

static void gst_httpsrc_push(GstSrc *src) {
  GstHttpSrc *httpsrc;
  GstBuffer *buf;
  glong readbytes;

  g_return_if_fail(src != NULL);
  g_return_if_fail(GST_IS_HTTPSRC(src));
//  g_return_if_fail(GST_FLAG_IS_SET(src,GST_));
  httpsrc = GST_HTTPSRC(src);

  buf = gst_buffer_new();
  GST_BUFFER_DATA(buf) = (gpointer)malloc(httpsrc->bytes_per_read);
  readbytes = read(httpsrc->fd,GST_BUFFER_DATA(buf),httpsrc->bytes_per_read);
  if (readbytes == 0) {
    gst_src_signal_eos(GST_SRC(httpsrc));
    return;
  }

  if (readbytes < httpsrc->bytes_per_read) {
    // FIXME: set the buffer's EOF bit here
  }
  GST_BUFFER_OFFSET(buf) = httpsrc->curoffset;
  GST_BUFFER_SIZE(buf) = readbytes;
  httpsrc->curoffset += readbytes;

  gst_pad_push(httpsrc->srcpad,buf);
}

static gboolean gst_httpsrc_open_url(GstHttpSrc *httpsrc) {
  gint status;

  g_return_val_if_fail(!GST_FLAG_IS_SET(httpsrc,GST_HTTPSRC_OPEN), FALSE);
  g_return_val_if_fail(httpsrc->url != NULL, FALSE);

  httpsrc->request = ghttp_request_new();
  ghttp_set_uri(httpsrc->request,httpsrc->url);
  ghttp_set_sync(httpsrc->request,ghttp_async);
  ghttp_set_header(httpsrc->request,"User-Agent","GstHttpSrc");
  ghttp_prepare(httpsrc->request);

  /* process everything up to the actual data stream */
  /* FIXME: should be in preroll, but hey */
  status = 0;
  while ((ghttp_get_status(httpsrc->request).proc != ghttp_proc_response)
         && (status >= 0)) {
    status = ghttp_process(httpsrc->request);
  }

  /* get the fd so we can read data ourselves */
  httpsrc->fd = ghttp_get_socket(httpsrc->request);
  GST_FLAG_SET(httpsrc,GST_HTTPSRC_OPEN);
  return TRUE;
}

/* unmap and close the file */
static void gst_httpsrc_close_url(GstHttpSrc *src) {  
  g_return_if_fail(GST_FLAG_IS_SET(src,GST_HTTPSRC_OPEN));

  g_return_if_fail(src->fd > 0);
 
  close(src->fd);
  src->fd = 0;

  GST_FLAG_UNSET(src,GST_HTTPSRC_OPEN);
}

static void gst_httpsrc_set_arg(GtkObject *object,GtkArg *arg,guint id) {
  GstHttpSrc *src;

  /* it's not null if we got it, but it might not be ours */
  g_return_if_fail(GST_IS_HTTPSRC(object));
  src = GST_HTTPSRC(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->url) g_free(src->url);
      /* clear the url 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->url = NULL;
      /* otherwise set the new url */
      } else {
        src->url = g_strdup(GTK_VALUE_STRING(*arg));
      }
      break;
    case ARG_BYTESPERREAD:
      src->bytes_per_read = GTK_VALUE_INT(*arg);
      break;
    default:
      break;
  }
}

static void gst_httpsrc_get_arg(GtkObject *object,GtkArg *arg,guint id) {
  GstHttpSrc *httpsrc;

  /* it's not null if we got it, but it might not be ours */
  g_return_if_fail(GST_IS_HTTPSRC(object));
  httpsrc = GST_HTTPSRC(object);
                          
  switch (id) {
    case ARG_LOCATION:
      GTK_VALUE_STRING(*arg) = httpsrc->url;
      break;
    case ARG_BYTESPERREAD:
      GTK_VALUE_INT(*arg) = httpsrc->bytes_per_read;
      break;
    default:
      arg->type = GTK_TYPE_INVALID;
      break;
  }
}

static GstElementStateReturn gst_httpsrc_change_state(GstElement *element) {
  g_return_val_if_fail(GST_IS_HTTPSRC(element),GST_STATE_FAILURE);

  if (GST_STATE_PENDING(element) == GST_STATE_NULL) {
    if (GST_FLAG_IS_SET(element,GST_HTTPSRC_OPEN))
      gst_httpsrc_close_url(GST_HTTPSRC(element));
  } else {
    if (!GST_FLAG_IS_SET(element,GST_HTTPSRC_OPEN)) {
      if (!gst_httpsrc_open_url(GST_HTTPSRC(element)))
        return GST_STATE_FAILURE;
    }
  }
 
  if (GST_ELEMENT_CLASS(parent_class)->change_state)
    return GST_ELEMENT_CLASS(parent_class)->change_state(element);
  return GST_STATE_SUCCESS;
}