gstreamer/sys/vcd/vcdsrc.c
2012-04-05 18:02:56 +02:00

589 lines
14 KiB
C

/* 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 "vcdsrc.h"
#define DEFAULT_DEVICE "/dev/cdrom"
/* VCDSrc signals and args */
enum
{
/* FILL ME */
LAST_SIGNAL
};
enum
{
PROP_0,
PROP_DEVICE,
PROP_TRACK,
PROP_MAX_ERRORS
};
static GstStaticPadTemplate srctemplate = GST_STATIC_PAD_TEMPLATE ("src",
GST_PAD_SRC,
GST_PAD_ALWAYS,
GST_STATIC_CAPS_ANY);
GST_DEBUG_CATEGORY_STATIC (gst_vcdsrc_debug);
#define GST_CAT_DEFAULT gst_vcdsrc_debug
static void gst_vcdsrc_uri_handler_init (gpointer g_iface, gpointer iface_data);
static void
gst_vcdsrc_setup_interfaces (GType type)
{
static const GInterfaceInfo urihandler_info = {
gst_vcdsrc_uri_handler_init,
NULL,
NULL,
};
g_type_add_interface_static (type, GST_TYPE_URI_HANDLER, &urihandler_info);
}
GST_BOILERPLATE_FULL (GstVCDSrc, gst_vcdsrc, GstPushSrc, GST_TYPE_PUSH_SRC,
gst_vcdsrc_setup_interfaces);
static void gst_vcdsrc_finalize (GObject * object);
static void gst_vcdsrc_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec);
static void gst_vcdsrc_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec);
static gboolean gst_vcdsrc_start (GstBaseSrc * src);
static gboolean gst_vcdsrc_stop (GstBaseSrc * src);
static GstFlowReturn gst_vcdsrc_create (GstPushSrc * src, GstBuffer ** out);
static void
gst_vcdsrc_base_init (gpointer g_class)
{
GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);
gst_element_class_set_details_simple (element_class, "VCD Source",
"Source/File",
"Asynchronous read from VCD disk", "Erik Walthinsen <omega@cse.ogi.edu>");
gst_element_class_add_pad_template (element_class,
gst_static_pad_template_get (&srctemplate));
}
static void
gst_vcdsrc_class_init (GstVCDSrcClass * klass)
{
GObjectClass *gobject_class;
GstBaseSrcClass *basesrc_class;
GstPushSrcClass *pushsrc_class;
gobject_class = (GObjectClass *) klass;
basesrc_class = (GstBaseSrcClass *) klass;
pushsrc_class = (GstPushSrcClass *) klass;
gobject_class->set_property = gst_vcdsrc_set_property;
gobject_class->get_property = gst_vcdsrc_get_property;
gobject_class->finalize = gst_vcdsrc_finalize;
g_object_class_install_property (gobject_class, PROP_DEVICE,
g_param_spec_string ("device", "Device",
"CD device location", NULL, G_PARAM_READWRITE));
g_object_class_install_property (gobject_class, PROP_TRACK,
g_param_spec_int ("track", "Track",
"Track number to play", G_MININT, G_MAXINT, 0, G_PARAM_READWRITE));
g_object_class_install_property (gobject_class, PROP_MAX_ERRORS,
g_param_spec_int ("max-errors", "Max. errors",
"Maximum number of errors before bailing out",
0, G_MAXINT, 16, G_PARAM_READWRITE));
basesrc_class->start = gst_vcdsrc_start;
basesrc_class->stop = gst_vcdsrc_stop;
pushsrc_class->create = gst_vcdsrc_create;
GST_DEBUG_CATEGORY_INIT (gst_vcdsrc_debug, "vcdsrc", 0,
"VideoCD Source element");
}
static void
gst_vcdsrc_init (GstVCDSrc * vcdsrc, GstVCDSrcClass * klass)
{
vcdsrc->device = g_strdup (DEFAULT_DEVICE);
vcdsrc->track = 1;
vcdsrc->fd = 0;
vcdsrc->trackoffset = 0;
vcdsrc->curoffset = 0;
vcdsrc->bytes_per_read = VCD_BYTES_PER_SECTOR;
vcdsrc->max_errors = 16;
}
static void
gst_vcdsrc_finalize (GObject * object)
{
GstVCDSrc *vcdsrc = GST_VCDSRC (object);
g_free (vcdsrc->device);
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static inline guint64
gst_vcdsrc_msf (GstVCDSrc * vcdsrc, gint track)
{
return (vcdsrc->tracks[track].cdte_addr.msf.minute * 60 +
vcdsrc->tracks[track].cdte_addr.msf.second) * 75 +
vcdsrc->tracks[track].cdte_addr.msf.frame;
}
static void
gst_vcdsrc_recalculate (GstVCDSrc * vcdsrc)
{
/* calculate track offset (beginning of track) */
vcdsrc->trackoffset = gst_vcdsrc_msf (vcdsrc, vcdsrc->track);
GST_DEBUG ("track offset is %ld", vcdsrc->trackoffset);
}
static void
gst_vcdsrc_set_property (GObject * object, guint prop_id, const GValue * value,
GParamSpec * pspec)
{
GstVCDSrc *src;
src = GST_VCDSRC (object);
switch (prop_id) {
case PROP_DEVICE:
g_free (src->device);
src->device = g_value_dup_string (value);
break;
case PROP_TRACK:
if (g_value_get_int (value) >= 1 &&
g_value_get_int (value) < src->numtracks) {
src->track = g_value_get_int (value);
gst_vcdsrc_recalculate (src);
}
break;
case PROP_MAX_ERRORS:
src->max_errors = g_value_get_int (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_vcdsrc_get_property (GObject * object, guint prop_id, GValue * value,
GParamSpec * pspec)
{
GstVCDSrc *src;
g_return_if_fail (GST_IS_VCDSRC (object));
src = GST_VCDSRC (object);
switch (prop_id) {
case PROP_DEVICE:
g_value_set_string (value, src->device);
break;
case PROP_TRACK:
g_value_set_int (value, src->track);
break;
case PROP_MAX_ERRORS:
g_value_set_int (value, src->max_errors);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
#if 0
static gboolean
gst_vcdsrc_srcpad_event (GstPad * pad, GstEvent * event)
{
GstVCDSrc *vcdsrc = GST_VCDSRC (gst_pad_get_parent (pad));
gboolean res = TRUE;
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_SEEK:{
gint64 new_off;
if (GST_EVENT_SEEK_FORMAT (event) != GST_FORMAT_BYTES)
return FALSE;
new_off = GST_EVENT_SEEK_OFFSET (event);
switch (GST_EVENT_SEEK_METHOD (event)) {
case GST_SEEK_METHOD_SET:
/* no-op */
break;
case GST_SEEK_METHOD_CUR:
new_off += vcdsrc->curoffset * vcdsrc->bytes_per_read;
break;
case GST_SEEK_METHOD_END:
new_off = (gst_vcdsrc_msf (vcdsrc, vcdsrc->track + 1) -
vcdsrc->trackoffset) * vcdsrc->bytes_per_read - new_off;
break;
default:
return FALSE;
}
if (new_off < 0 ||
new_off > (gst_vcdsrc_msf (vcdsrc, vcdsrc->track + 1) -
vcdsrc->trackoffset) * vcdsrc->bytes_per_read)
return FALSE;
vcdsrc->curoffset = new_off / vcdsrc->bytes_per_read;
vcdsrc->tempoffset = new_off % vcdsrc->bytes_per_read;
vcdsrc->discont = TRUE;
if (GST_EVENT_SEEK_FLAGS (event) & GST_SEEK_FLAG_FLUSH)
vcdsrc->flush = TRUE;
break;
}
default:
res = FALSE;
break;
}
gst_event_unref (event);
return res;
}
#endif
#if 0
static gboolean
gst_vcdsrc_srcpad_query (GstPad * pad, GstQueryType type,
GstFormat * format, gint64 * value)
{
GstVCDSrc *vcdsrc = GST_VCDSRC (gst_pad_get_parent (pad));
gboolean res = TRUE;
if (*format != GST_FORMAT_BYTES)
return FALSE;
switch (type) {
case GST_QUERY_TOTAL:
*value = (gst_vcdsrc_msf (vcdsrc, vcdsrc->track + 1) -
vcdsrc->trackoffset) * vcdsrc->bytes_per_read;
break;
case GST_QUERY_POSITION:
*value = vcdsrc->curoffset * vcdsrc->bytes_per_read;
break;
default:
res = FALSE;
break;
}
return res;
}
#endif
static GstFlowReturn
gst_vcdsrc_create (GstPushSrc * src, GstBuffer ** buf)
{
GstVCDSrc *vcdsrc;
GstBuffer *outbuf;
gulong offset;
struct cdrom_msf *msf;
gint error_count = 0;
vcdsrc = GST_VCDSRC (src);
offset = vcdsrc->trackoffset + vcdsrc->curoffset;
if (offset >= gst_vcdsrc_msf (vcdsrc, vcdsrc->track + 1))
goto eos;
/* create the buffer */
outbuf = gst_buffer_new_and_alloc (vcdsrc->bytes_per_read);
msf = (struct cdrom_msf *) GST_BUFFER_DATA (outbuf);
read:
/* read it in from the device */
msf->cdmsf_frame0 = offset % 75;
msf->cdmsf_sec0 = (offset / 75) % 60;
msf->cdmsf_min0 = (offset / (75 * 60));
GST_LOG ("msf is %d:%d:%d", msf->cdmsf_min0, msf->cdmsf_sec0,
msf->cdmsf_frame0);
if (ioctl (vcdsrc->fd, CDROMREADRAW, msf) < 0) {
if (++error_count <= vcdsrc->max_errors) {
vcdsrc->curoffset++;
offset++;
goto read;
}
GST_ELEMENT_ERROR (vcdsrc, RESOURCE, READ, (NULL),
("Read from cdrom at %d:%d:%d failed: %s",
msf->cdmsf_min0, msf->cdmsf_sec0, msf->cdmsf_frame0,
strerror (errno)));
return GST_FLOW_ERROR;
}
GST_BUFFER_SIZE (outbuf) = vcdsrc->bytes_per_read;
vcdsrc->curoffset += 1;
*buf = outbuf;
return GST_FLOW_OK;
/* ERRORS */
eos:
{
GST_DEBUG_OBJECT (vcdsrc, "got eos");
return GST_FLOW_UNEXPECTED;
}
}
/* open the file, necessary to go to RUNNING state */
static gboolean
gst_vcdsrc_start (GstBaseSrc * bsrc)
{
int i;
GstVCDSrc *src = GST_VCDSRC (bsrc);
struct stat buf;
/* open the device */
src->fd = open (src->device, O_RDONLY);
if (src->fd < 0)
goto open_failed;
if (fstat (src->fd, &buf) < 0)
goto toc_failed;
/* If it's not a block device, then we need to try and
* parse the cue file if there is one
* FIXME implement */
if (!S_ISBLK (buf.st_mode)) {
GST_DEBUG ("Reading CUE files not handled yet, cannot process %s",
GST_STR_NULL (src->device));
goto toc_failed;
}
/* read the table of contents */
if (ioctl (src->fd, CDROMREADTOCHDR, &src->tochdr))
goto toc_failed;
/* 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 + 1);
/* read each track entry */
for (i = 0; i <= src->numtracks; i++) {
src->tracks[i].cdte_track = i == src->numtracks ? CDROM_LEADOUT : i + 1;
src->tracks[i].cdte_format = CDROM_MSF;
if (ioctl (src->fd, CDROMREADTOCENTRY, &src->tracks[i]))
goto toc_entry_failed;
GST_DEBUG ("track %d begins at %d:%02d.%02d", i,
src->tracks[i].cdte_addr.msf.minute,
src->tracks[i].cdte_addr.msf.second,
src->tracks[i].cdte_addr.msf.frame);
}
src->curoffset = 0;
gst_vcdsrc_recalculate (src);
return TRUE;
/* ERRORS */
open_failed:
{
GST_ELEMENT_ERROR (src, RESOURCE, OPEN_READ, (NULL), GST_ERROR_SYSTEM);
return FALSE;
}
toc_failed:
{
GST_ELEMENT_ERROR (src, RESOURCE, OPEN_READ, (NULL), GST_ERROR_SYSTEM);
close (src->fd);
return FALSE;
}
toc_entry_failed:
{
GST_ELEMENT_ERROR (src, RESOURCE, OPEN_READ, (NULL), GST_ERROR_SYSTEM);
g_free (src->tracks);
close (src->fd);
return FALSE;
}
}
/* close the file */
static gboolean
gst_vcdsrc_stop (GstBaseSrc * bsrc)
{
GstVCDSrc *src = GST_VCDSRC (bsrc);
/* close the file */
close (src->fd);
/* zero out a lot of our state */
src->fd = 0;
src->curoffset = 0;
g_free (src->tracks);
return TRUE;
}
/*
* URI interface.
*/
static guint
gst_vcdsrc_uri_get_type (void)
{
return GST_URI_SRC;
}
static gchar **
gst_vcdsrc_uri_get_protocols (void)
{
static gchar *protocols[] = { (char *) "vcd", NULL };
return protocols;
}
static const gchar *
gst_vcdsrc_uri_get_uri (GstURIHandler * handler)
{
GstVCDSrc *src = GST_VCDSRC (handler);
gchar *result;
GST_OBJECT_LOCK (src);
result = g_strdup_printf ("vcd://%d", src->track);
GST_OBJECT_UNLOCK (src);
return result;
}
static gboolean
gst_vcdsrc_uri_set_uri (GstURIHandler * handler, const gchar * uri)
{
GstVCDSrc *src = GST_VCDSRC (handler);
gchar *location = NULL;
gint tracknr;
GST_DEBUG_OBJECT (src, "setting uri '%s'", uri);
if (!gst_uri_has_protocol (uri, "vcd"))
goto wrong_protocol;
/* parse out the track in the location */
if (!(location = gst_uri_get_location (uri)))
goto no_location;
GST_DEBUG_OBJECT (src, "have location '%s'", location);
/*
* URI structure: vcd:///path/to/device,track-num
*/
if (g_str_has_prefix (uri, "vcd://")) {
GST_OBJECT_LOCK (src);
g_free (src->device);
if (strlen (uri) > 6)
src->device = g_strdup (uri + 6);
else
src->device = g_strdup (DEFAULT_DEVICE);
GST_DEBUG_OBJECT (src, "configured device %s", src->device);
GST_OBJECT_UNLOCK (src);
}
/* Parse the track number */
{
char **split;
split = g_strsplit (location, ",", 2);
if (split == NULL || *split == NULL || split[1] == NULL) {
tracknr = 1;
} else if (sscanf (split[1], "%d", &tracknr) != 1 || tracknr < 1) {
g_strfreev (split);
goto invalid_location;
}
g_strfreev (split);
}
GST_OBJECT_LOCK (src);
src->track = tracknr;
GST_DEBUG_OBJECT (src, "configured track %d", src->track);
GST_OBJECT_UNLOCK (src);
g_free (location);
return TRUE;
/* ERRORS */
wrong_protocol:
{
GST_ERROR_OBJECT (src, "wrong protocol, uri = %s", uri);
return FALSE;
}
no_location:
{
GST_ERROR_OBJECT (src, "no location specified");
return FALSE;
}
invalid_location:
{
GST_ERROR_OBJECT (src, "Invalid location %s in URI '%s'", location, uri);
g_free (location);
return FALSE;
}
}
static void
gst_vcdsrc_uri_handler_init (gpointer g_iface, gpointer iface_data)
{
GstURIHandlerInterface *iface = (GstURIHandlerInterface *) g_iface;
iface->get_type = gst_vcdsrc_uri_get_type;
iface->get_protocols = gst_vcdsrc_uri_get_protocols;
iface->get_uri = gst_vcdsrc_uri_get_uri;
iface->set_uri = gst_vcdsrc_uri_set_uri;
}
static gboolean
plugin_init (GstPlugin * plugin)
{
return gst_element_register (plugin, "vcdsrc", GST_RANK_SECONDARY,
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_NAME, GST_PACKAGE_ORIGIN)