gstreamer/sys/vcd/vcdsrc.c

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/* GStreamer
* 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.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <dirent.h>
#include <errno.h>
#include <linux/cdrom.h>
#include <vcdsrc.h>
static GstElementDetails vcdsrc_details = GST_ELEMENT_DETAILS ("VCD Source",
"Source/File",
"Asynchronous read from VCD disk",
"Erik Walthinsen <omega@cse.ogi.edu>");
/* VCDSrc signals and args */
enum
{
/* FILL ME */
LAST_SIGNAL
};
enum
{
ARG_0,
ARG_LOCATION,
ARG_TRACK,
ARG_BYTESPERREAD,
ARG_OFFSET,
ARG_MAX_ERRORS
};
static void vcdsrc_base_init (gpointer g_class);
static void vcdsrc_class_init (VCDSrcClass * klass);
static void vcdsrc_init (VCDSrc * vcdsrc);
static void vcdsrc_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec);
static void vcdsrc_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec);
static GstData *vcdsrc_get (GstPad * pad);
/*static GstBuffer * vcdsrc_get_region (GstPad *pad,gulong offset,gulong size); */
static GstElementStateReturn vcdsrc_change_state (GstElement * element);
static void vcdsrc_recalculate (VCDSrc * vcdsrc);
static GstElementClass *parent_class = NULL;
/*static guint vcdsrc_signals[LAST_SIGNAL] = { 0 }; */
GType
vcdsrc_get_type (void)
{
static GType vcdsrc_type = 0;
if (!vcdsrc_type) {
static const GTypeInfo vcdsrc_info = {
sizeof (VCDSrcClass),
vcdsrc_base_init,
NULL,
(GClassInitFunc) vcdsrc_class_init,
NULL,
NULL,
sizeof (VCDSrc),
0,
(GInstanceInitFunc) vcdsrc_init,
};
vcdsrc_type =
g_type_register_static (GST_TYPE_ELEMENT, "VCDSrc", &vcdsrc_info, 0);
}
return vcdsrc_type;
}
static void
vcdsrc_base_init (gpointer g_class)
{
GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);
gst_element_class_set_details (element_class, &vcdsrc_details);
}
static void
vcdsrc_class_init (VCDSrcClass * klass)
{
GObjectClass *gobject_class;
GstElementClass *gstelement_class;
gobject_class = (GObjectClass *) klass;
gstelement_class = (GstElementClass *) klass;
parent_class = g_type_class_peek_parent (klass);
g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_LOCATION, g_param_spec_string ("location", "location", "location", NULL, G_PARAM_READWRITE)); /* CHECKME */
g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_TRACK, g_param_spec_int ("track", "track", "track", G_MININT, G_MAXINT, 0, G_PARAM_READWRITE)); /* CHECKME */
g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_BYTESPERREAD, g_param_spec_int ("bytesperread", "bytesperread", "bytesperread", G_MININT, G_MAXINT, 0, G_PARAM_READABLE)); /* CHECKME */
g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_OFFSET, g_param_spec_int ("offset", "offset", "offset", G_MININT, G_MAXINT, 0, G_PARAM_READWRITE)); /* CHECKME */
g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_MAX_ERRORS,
g_param_spec_int ("max-errors", "", "", 0, G_MAXINT, 16,
G_PARAM_READWRITE));
gobject_class->set_property = vcdsrc_set_property;
gobject_class->get_property = vcdsrc_get_property;
gstelement_class->change_state = vcdsrc_change_state;
}
static void
vcdsrc_init (VCDSrc * vcdsrc)
{
vcdsrc->srcpad = gst_pad_new ("src", GST_PAD_SRC);
gst_pad_set_get_function (vcdsrc->srcpad, vcdsrc_get);
/* gst_pad_set_get_region_function (vcdsrc->srcpad, vcdsrc_getregion); */
gst_element_add_pad (GST_ELEMENT (vcdsrc), vcdsrc->srcpad);
vcdsrc->device = g_strdup ("/dev/cdrom");
vcdsrc->track = 2;
vcdsrc->fd = 0;
vcdsrc->trackoffset = 0;
vcdsrc->curoffset = 0;
vcdsrc->bytes_per_read = VCD_BYTES_PER_SECTOR;
vcdsrc->seq = 0;
vcdsrc->max_errors = 16;
}
static void
vcdsrc_set_property (GObject * object, guint prop_id, const GValue * value,
GParamSpec * pspec)
{
VCDSrc *src;
/* it's not null if we got it, but it might not be ours */
g_return_if_fail (GST_IS_VCDSRC (object));
src = VCDSRC (object);
switch (prop_id) {
case ARG_LOCATION:
/* the element must be stopped in order to do this */
/* g_return_if_fail(!GST_FLAG_IS_SET(src,GST_STATE_RUNNING)); */
if (src->device)
g_free (src->device);
/* clear the filename if we get a NULL (is that possible?) */
if (g_value_get_string (value) == NULL)
src->device = NULL;
/* otherwise set the new filename */
else
src->device = g_strdup (g_value_get_string (value));
break;
case ARG_TRACK:
src->track = g_value_get_int (value);
vcdsrc_recalculate (src);
break;
/* case ARG_BYTESPERREAD:
src->bytes_per_read = g_value_get_int (value);
break;*/
case ARG_OFFSET:
src->curoffset = g_value_get_int (value) / VCD_BYTES_PER_SECTOR;
break;
case ARG_MAX_ERRORS:
src->max_errors = g_value_get_int (value);
break;
default:
break;
}
}
static void
vcdsrc_get_property (GObject * object, guint prop_id, GValue * value,
GParamSpec * pspec)
{
VCDSrc *src;
/* it's not null if we got it, but it might not be ours */
g_return_if_fail (GST_IS_VCDSRC (object));
src = VCDSRC (object);
switch (prop_id) {
case ARG_LOCATION:
g_value_set_string (value, src->device);
break;
case ARG_TRACK:
g_value_set_int (value, src->track);
break;
case ARG_BYTESPERREAD:
g_value_set_int (value, src->bytes_per_read);
break;
case ARG_OFFSET:
g_value_set_int (value, src->curoffset * VCD_BYTES_PER_SECTOR);
break;
case ARG_MAX_ERRORS:
g_value_set_int (value, src->max_errors);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static GstData *
vcdsrc_get (GstPad * pad)
{
VCDSrc *vcdsrc;
GstBuffer *buf;
gulong offset;
struct cdrom_msf *msf;
gint error_count = 0;
/* fprintf(stderr,"in vcdsrc_push\n"); */
g_return_val_if_fail (pad != NULL, NULL);
g_return_val_if_fail (GST_IS_PAD (pad), NULL);
vcdsrc = VCDSRC (GST_OBJECT_PARENT (pad));
g_return_val_if_fail (GST_FLAG_IS_SET (vcdsrc, VCDSRC_OPEN), NULL);
/* create the buffer */
/* FIXME: should eventually use a bufferpool for this */
buf = gst_buffer_new ();
g_return_val_if_fail (buf != NULL, NULL);
/* allocate the space for the buffer data */
GST_BUFFER_DATA (buf) = g_malloc (vcdsrc->bytes_per_read);
memset (GST_BUFFER_DATA (buf), 0, vcdsrc->bytes_per_read);
g_return_val_if_fail (GST_BUFFER_DATA (buf) != NULL, NULL);
msf = (struct cdrom_msf *) GST_BUFFER_DATA (buf);
read_sector:
/* read it in from the device */
offset = vcdsrc->trackoffset + vcdsrc->curoffset;
msf->cdmsf_frame0 = offset % 75;
msf->cdmsf_sec0 = (offset / 75) % 60;
msf->cdmsf_min0 = (offset / (75 * 60));
/*GST_INFO("msf is %d:%d:%d\n",msf->cdmsf_min0,msf->cdmsf_sec0, */
/* msf->cdmsf_frame0); */
if (ioctl (vcdsrc->fd, CDROMREADRAW, msf)) {
if (++error_count > vcdsrc->max_errors) {
gst_element_set_eos (GST_ELEMENT (vcdsrc));
return GST_DATA (gst_event_new (GST_EVENT_EOS));
}
fprintf (stderr, "%s while reading raw data from cdrom at %d:%d:%d\n",
strerror (errno), msf->cdmsf_min0, msf->cdmsf_sec0, msf->cdmsf_frame0);
vcdsrc->curoffset += 1;
/* Or we can return a zero-filled buffer. Which is better? */
goto read_sector;
}
GST_BUFFER_OFFSET (buf) = vcdsrc->curoffset;
GST_BUFFER_SIZE (buf) = vcdsrc->bytes_per_read;
vcdsrc->curoffset += 1;
return GST_DATA (buf);
}
/* open the file, necessary to go to RUNNING state */
static gboolean
vcdsrc_open_file (VCDSrc * src)
{
int i;
g_return_val_if_fail (!GST_FLAG_IS_SET (src, VCDSRC_OPEN), FALSE);
/* open the device */
src->fd = open (src->device, O_RDONLY);
if (src->fd < 0) {
GST_ELEMENT_ERROR (src, RESOURCE, OPEN_READ, (NULL), GST_ERROR_SYSTEM);
return FALSE;
}
/* read the table of contents */
if (ioctl (src->fd, CDROMREADTOCHDR, &src->tochdr)) {
perror ("reading toc of VCD\n");
/* FIXME */
/* exit(1); */
}
/* allocate enough track structs for disk */
src->numtracks = (src->tochdr.cdth_trk1 - src->tochdr.cdth_trk0) + 1;
src->tracks = g_new (struct cdrom_tocentry, src->numtracks);
/* read each track entry */
for (i = 0; i < src->numtracks; i++) {
src->tracks[i].cdte_track = i + 1;
src->tracks[i].cdte_format = CDROM_MSF;
if (ioctl (src->fd, CDROMREADTOCENTRY, &src->tracks[i])) {
perror ("reading tocentry");
/* FIXME */
/* exit(1);*/
}
fprintf (stderr, "VCDSrc: track begins at %d:%d:%d\n",
src->tracks[i].cdte_addr.msf.minute,
src->tracks[i].cdte_addr.msf.second,
src->tracks[i].cdte_addr.msf.frame);
}
src->trackoffset =
(((src->tracks[src->track - 1].cdte_addr.msf.minute * 60) +
src->tracks[src->track - 1].cdte_addr.msf.second) * 75) +
src->tracks[src->track - 1].cdte_addr.msf.frame;
fprintf (stderr, "VCDSrc: track offset is %ld\n", src->trackoffset);
GST_FLAG_SET (src, VCDSRC_OPEN);
return TRUE;
}
/* close the file */
static void
vcdsrc_close_file (VCDSrc * src)
{
g_return_if_fail (GST_FLAG_IS_SET (src, VCDSRC_OPEN));
/* close the file */
close (src->fd);
/* zero out a lot of our state */
src->fd = 0;
src->curoffset = 0;
src->seq = 0;
GST_FLAG_UNSET (src, VCDSRC_OPEN);
}
static GstElementStateReturn
vcdsrc_change_state (GstElement * element)
{
g_return_val_if_fail (GST_IS_VCDSRC (element), GST_STATE_FAILURE);
/* 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, VCDSRC_OPEN))
vcdsrc_close_file (VCDSRC (element));
/* otherwise (READY or higher) we need to open the sound card */
} else {
if (!GST_FLAG_IS_SET (element, VCDSRC_OPEN)) {
if (!vcdsrc_open_file (VCDSRC (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;
}
static void
vcdsrc_recalculate (VCDSrc * vcdsrc)
{
if (GST_FLAG_IS_SET (vcdsrc, VCDSRC_OPEN)) {
/* calculate track offset (beginning of track) */
vcdsrc->trackoffset =
(((vcdsrc->tracks[vcdsrc->track - 1].cdte_addr.msf.minute * 60) +
vcdsrc->tracks[vcdsrc->track - 1].cdte_addr.msf.second) * 75) +
vcdsrc->tracks[vcdsrc->track - 1].cdte_addr.msf.frame;
fprintf (stderr, "VCDSrc: track offset is %ld\n", vcdsrc->trackoffset);
}
}
static gboolean
plugin_init (GstPlugin * plugin)
{
return gst_element_register (plugin, "vcdsrc", GST_RANK_NONE,
GST_TYPE_VCDSRC);
}
GST_PLUGIN_DEFINE (GST_VERSION_MAJOR,
GST_VERSION_MINOR,
"vcdsrc",
"Asynchronous read from VCD disk",
plugin_init, VERSION, GST_LICENSE, GST_PACKAGE, GST_ORIGIN)