summaryrefslogtreecommitdiffstats
path: root/gst/cdxaparse/gstvcdparse.c
diff options
context:
space:
mode:
authorRonald S. Bultje <rbultje@ronald.bitfreak.net>2004-11-25 20:03:51 +0000
committerRonald S. Bultje <rbultje@ronald.bitfreak.net>2004-11-25 20:03:51 +0000
commit97aeaa8eb0ff5e853f2dbd25b492da456073b4cb (patch)
treedcb67111db44a2f8f3acdbcfb39265fdb524d3d5 /gst/cdxaparse/gstvcdparse.c
parentbcdcdcd3d63af7c01cb6980fc66b51e1a693fbb4 (diff)
downloadgst-plugins-bad-97aeaa8eb0ff5e853f2dbd25b492da456073b4cb.tar.gz
gst-plugins-bad-97aeaa8eb0ff5e853f2dbd25b492da456073b4cb.tar.bz2
gst-plugins-bad-97aeaa8eb0ff5e853f2dbd25b492da456073b4cb.zip
gst/cdxaparse/: SVCD/VCD header stripping separated from CDXA image parsing.
Original commit message from CVS: * gst/cdxaparse/Makefile.am: * gst/cdxaparse/gstcdxaparse.c: (gst_cdxaparse_get_type), (gst_cdxaparse_class_init), (gst_cdxaparse_init), (gst_cdxaparse_loop), (gst_cdxaparse_change_state), (plugin_init): * gst/cdxaparse/gstcdxaparse.h: * gst/cdxaparse/gstcdxastrip.c: (gst_cdxastrip_get_type), (gst_cdxastrip_base_init), (gst_cdxastrip_class_init), (gst_cdxastrip_init), (gst_cdxastrip_get_src_formats), (gst_cdxastrip_get_src_query_types), (gst_cdxastrip_handle_src_query), (gst_cdxastrip_get_event_mask), (gst_cdxastrip_handle_src_event), (gst_cdxastrip_strip), (gst_cdxastrip_sync), (gst_cdxastrip_handle_event), (gst_cdxastrip_chain), (gst_cdxastrip_change_state): * gst/cdxaparse/gstcdxastrip.h: SVCD/VCD header stripping separated from CDXA image parsing. * gst/typefind/gsttypefindfunctions.c: (mp3_type_find), (plugin_init): Add VCD/SVCD header typefinding for VCD/SVCD. * sys/vcd/vcdsrc.c: (gst_vcdsrc_get_type), (gst_vcdsrc_base_init), (gst_vcdsrc_class_init), (gst_vcdsrc_init), (gst_vcdsrc_set_property), (gst_vcdsrc_get_property), (gst_vcdsrc_get_event_mask), (gst_vcdsrc_get_query_types), (gst_vcdsrc_get_formats), (gst_vcdsrc_srcpad_event), (gst_vcdsrc_srcpad_query), (gst_vcdsrc_get), (gst_vcdsrc_open_file), (gst_vcdsrc_close_file), (gst_vcdsrc_change_state), (gst_vcdsrc_msf), (gst_vcdsrc_recalculate), (gst_vcdsrc_uri_get_type), (gst_vcdsrc_uri_get_protocols), (gst_vcdsrc_uri_get_uri), (gst_vcdsrc_uri_set_uri), (gst_vcdsrc_uri_handler_init): * sys/vcd/vcdsrc.h: Fix up, add seeking, querying, URI interface. Works in totem now.
Diffstat (limited to 'gst/cdxaparse/gstvcdparse.c')
-rw-r--r--gst/cdxaparse/gstvcdparse.c411
1 files changed, 411 insertions, 0 deletions
diff --git a/gst/cdxaparse/gstvcdparse.c b/gst/cdxaparse/gstvcdparse.c
new file mode 100644
index 00000000..312c3028
--- /dev/null
+++ b/gst/cdxaparse/gstvcdparse.c
@@ -0,0 +1,411 @@
+/* GStreamer CDXA sync strippper
+ * Copyright (C) 2004 Ronald Bultje <rbultje@ronald.bitfreak.net>
+ *
+ * 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 <string.h>
+#include <gst/gst.h>
+#include "gstcdxastrip.h"
+
+static void gst_cdxastrip_base_init (GstCDXAStripClass * klass);
+static void gst_cdxastrip_class_init (GstCDXAStripClass * klass);
+static void gst_cdxastrip_init (GstCDXAStrip * cdxastrip);
+
+static const GstEventMask *gst_cdxastrip_get_event_mask (GstPad * pad);
+static gboolean gst_cdxastrip_handle_src_event (GstPad * pad, GstEvent * event);
+static const GstFormat *gst_cdxastrip_get_src_formats (GstPad * pad);
+static const GstQueryType *gst_cdxastrip_get_src_query_types (GstPad * pad);
+static gboolean gst_cdxastrip_handle_src_query (GstPad * pad,
+ GstQueryType type, GstFormat * format, gint64 * value);
+
+static void gst_cdxastrip_chain (GstPad * pad, GstData * data);
+static GstElementStateReturn gst_cdxastrip_change_state (GstElement * element);
+
+static GstStaticPadTemplate sink_template_factory =
+GST_STATIC_PAD_TEMPLATE ("sink",
+ GST_PAD_SINK,
+ GST_PAD_ALWAYS,
+ GST_STATIC_CAPS ("video/x-vcd")
+ );
+
+static GstStaticPadTemplate src_template_factory =
+GST_STATIC_PAD_TEMPLATE ("src",
+ GST_PAD_SRC,
+ GST_PAD_ALWAYS,
+ GST_STATIC_CAPS ("video/mpeg, " "systemstream = (boolean) TRUE")
+ );
+
+static GstElementClass *parent_class = NULL;
+
+GType
+gst_cdxastrip_get_type (void)
+{
+ static GType cdxastrip_type = 0;
+
+ if (!cdxastrip_type) {
+ static const GTypeInfo cdxastrip_info = {
+ sizeof (GstCDXAStripClass),
+ (GBaseInitFunc) gst_cdxastrip_base_init,
+ NULL,
+ (GClassInitFunc) gst_cdxastrip_class_init,
+ NULL,
+ NULL,
+ sizeof (GstCDXAStrip),
+ 0,
+ (GInstanceInitFunc) gst_cdxastrip_init,
+ };
+
+ cdxastrip_type =
+ g_type_register_static (GST_TYPE_ELEMENT, "GstCDXAStrip",
+ &cdxastrip_info, 0);
+ }
+
+ return cdxastrip_type;
+}
+
+static void
+gst_cdxastrip_base_init (GstCDXAStripClass * klass)
+{
+ GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
+ static GstElementDetails gst_cdxastrip_details =
+ GST_ELEMENT_DETAILS ("vcd parser",
+ "Codec/Parser",
+ "Strip (S)VCD stream from its syncheaders",
+ "Ronald Bultje <rbultje@ronald.bitfreak.net>");
+
+ gst_element_class_add_pad_template (element_class,
+ gst_static_pad_template_get (&sink_template_factory));
+ gst_element_class_add_pad_template (element_class,
+ gst_static_pad_template_get (&src_template_factory));
+
+ gst_element_class_set_details (element_class, &gst_cdxastrip_details);
+}
+
+static void
+gst_cdxastrip_class_init (GstCDXAStripClass * klass)
+{
+ GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
+
+ parent_class = g_type_class_ref (GST_TYPE_ELEMENT);
+
+ element_class->change_state = gst_cdxastrip_change_state;
+}
+
+static void
+gst_cdxastrip_init (GstCDXAStrip * cdxastrip)
+{
+ GST_FLAG_SET (cdxastrip, GST_ELEMENT_EVENT_AWARE);
+
+ cdxastrip->sinkpad =
+ gst_pad_new_from_template (gst_static_pad_template_get
+ (&sink_template_factory), "sink");
+ gst_pad_set_chain_function (cdxastrip->sinkpad, gst_cdxastrip_chain);
+ gst_element_add_pad (GST_ELEMENT (cdxastrip), cdxastrip->sinkpad);
+
+ cdxastrip->srcpad =
+ gst_pad_new_from_template (gst_static_pad_template_get
+ (&src_template_factory), "src");
+ gst_pad_set_formats_function (cdxastrip->srcpad,
+ gst_cdxastrip_get_src_formats);
+ gst_pad_set_event_mask_function (cdxastrip->srcpad,
+ gst_cdxastrip_get_event_mask);
+ gst_pad_set_event_function (cdxastrip->srcpad,
+ gst_cdxastrip_handle_src_event);
+ gst_pad_set_query_type_function (cdxastrip->srcpad,
+ gst_cdxastrip_get_src_query_types);
+ gst_pad_set_query_function (cdxastrip->srcpad,
+ gst_cdxastrip_handle_src_query);
+ gst_element_add_pad (GST_ELEMENT (cdxastrip), cdxastrip->srcpad);
+}
+
+/*
+ * Stuff.
+ */
+
+static const GstFormat *
+gst_cdxastrip_get_src_formats (GstPad * pad)
+{
+ static const GstFormat formats[] = {
+ GST_FORMAT_BYTES,
+ 0
+ };
+
+ return formats;
+}
+
+static const GstQueryType *
+gst_cdxastrip_get_src_query_types (GstPad * pad)
+{
+ static const GstQueryType types[] = {
+ GST_QUERY_TOTAL,
+ GST_QUERY_POSITION,
+ 0
+ };
+
+ return types;
+}
+
+static gboolean
+gst_cdxastrip_handle_src_query (GstPad * pad,
+ GstQueryType type, GstFormat * format, gint64 * value)
+{
+ GstCDXAStrip *cdxa = GST_CDXASTRIP (gst_pad_get_parent (pad));
+
+ if (!gst_pad_query (GST_PAD_PEER (cdxa->sinkpad), type, format, value))
+ return FALSE;
+
+ if (*format != GST_FORMAT_BYTES)
+ return TRUE;
+
+ switch (type) {
+ case GST_QUERY_TOTAL:
+ case GST_QUERY_POSITION:{
+ gint num, rest;
+
+ num = *value / GST_CDXA_SECTOR_SIZE;
+ rest = *value % GST_CDXA_SECTOR_SIZE;
+
+ *value = num * GST_CDXA_DATA_SIZE;
+ if (rest > GST_CDXA_HEADER_SIZE) {
+ if (rest >= GST_CDXA_HEADER_SIZE + GST_CDXA_DATA_SIZE)
+ *value += GST_CDXA_DATA_SIZE;
+ else
+ *value += rest - GST_CDXA_HEADER_SIZE;
+ }
+ break;
+ }
+ default:
+ break;
+ }
+
+ return TRUE;
+}
+
+static const GstEventMask *
+gst_cdxastrip_get_event_mask (GstPad * pad)
+{
+ static const GstEventMask masks[] = {
+ {GST_EVENT_SEEK, GST_SEEK_METHOD_SET | GST_SEEK_FLAG_KEY_UNIT},
+ {0,}
+ };
+
+ return masks;
+}
+
+static gboolean
+gst_cdxastrip_handle_src_event (GstPad * pad, GstEvent * event)
+{
+ GstCDXAStrip *cdxa = GST_CDXASTRIP (gst_pad_get_parent (pad));
+
+ switch (GST_EVENT_TYPE (event)) {
+ case GST_EVENT_SEEK:
+ switch (GST_EVENT_SEEK_FORMAT (event)) {
+ case GST_FORMAT_BYTES:{
+ GstEvent *new;
+ gint64 off;
+ gint num, rest;
+
+ off = GST_EVENT_SEEK_OFFSET (event);
+ num = off / GST_CDXA_DATA_SIZE;
+ rest = off % GST_CDXA_DATA_SIZE;
+ off = num * GST_CDXA_SECTOR_SIZE;
+ if (rest > 0)
+ off += rest + GST_CDXA_HEADER_SIZE;
+ new = gst_event_new_seek (GST_EVENT_SEEK_TYPE (event), off);
+ gst_event_unref (event);
+ event = new;
+ }
+ default:
+ break;
+ }
+ break;
+ default:
+ break;
+ }
+
+ return gst_pad_send_event (GST_PAD_PEER (cdxa->sinkpad), event);
+}
+
+/*
+ * A sector is 2352 bytes long and is composed of:
+ *
+ * ! sync ! header ! subheader ! data ... ! edc !
+ * ! 12 bytes ! 4 bytes ! 8 bytes ! 2324 bytes ! 4 bytes !
+ * !-------------------------------------------------------!
+ *
+ * We strip the data out of it and send it to the srcpad.
+ *
+ * sync : 00 FF FF FF FF FF FF FF FF FF FF 00
+ * header : hour minute second mode
+ * sub-header : track channel sub_mode coding repeat (4 bytes)
+ * edc : checksum
+ */
+
+GstBuffer *
+gst_cdxastrip_strip (GstBuffer * buf)
+{
+ GstBuffer *sub;
+
+ g_assert (GST_BUFFER_SIZE (buf) >= GST_CDXA_SECTOR_SIZE);
+
+ /* Skip CDXA headers, only keep data.
+ * FIXME: check sync, resync, ... */
+ sub = gst_buffer_create_sub (buf, GST_CDXA_HEADER_SIZE, GST_CDXA_DATA_SIZE);
+ gst_buffer_unref (buf);
+
+ return sub;
+}
+
+/*
+ * -1 = no sync (discard buffer),
+ * otherwise offset indicates syncpoint in buffer.
+ */
+
+gint
+gst_cdxastrip_sync (GstBuffer * buf)
+{
+ guint size, off = 0;
+ guint8 *data;
+
+ for (size = GST_BUFFER_SIZE (buf), data = GST_BUFFER_DATA (buf);
+ size >= 12; size--, data++, off++) {
+ /* we could do a checksum check as well, but who cares... */
+ if (!memcmp (data, "\000\377\377\377\377\377\377\377\377\377\377\000", 12))
+ return off;
+ }
+
+ return -1;
+}
+
+/*
+ * Do stuff.
+ */
+
+static void
+gst_cdxastrip_handle_event (GstCDXAStrip * cdxa, GstEvent * event)
+{
+ switch (GST_EVENT_TYPE (event)) {
+ case GST_EVENT_DISCONTINUOUS:{
+ gint64 new_off, off;
+
+ if (gst_event_discont_get_value (event, GST_FORMAT_BYTES, &new_off)) {
+ GstEvent *new;
+ gint chunknum, rest;
+
+ chunknum = new_off / GST_CDXA_SECTOR_SIZE;
+ rest = new_off % GST_CDXA_SECTOR_SIZE;
+ off = chunknum * GST_CDXA_DATA_SIZE;
+ if (rest > GST_CDXA_HEADER_SIZE) {
+ if (rest >= GST_CDXA_HEADER_SIZE + GST_CDXA_DATA_SIZE)
+ off += GST_CDXA_DATA_SIZE;
+ else
+ off += rest - GST_CDXA_HEADER_SIZE;
+ }
+ new = gst_event_new_discontinuous (GST_EVENT_DISCONT_NEW_MEDIA (event),
+ GST_FORMAT_BYTES, new_off, GST_FORMAT_UNDEFINED);
+ gst_event_unref (event);
+ event = new;
+ }
+ gst_pad_event_default (cdxa->sinkpad, event);
+ break;
+ }
+ case GST_EVENT_FLUSH:
+ if (cdxa->cache) {
+ gst_buffer_unref (cdxa->cache);
+ cdxa->cache = NULL;
+ }
+ /* fall-through */
+ default:
+ gst_pad_event_default (cdxa->sinkpad, event);
+ break;
+ }
+}
+
+static void
+gst_cdxastrip_chain (GstPad * pad, GstData * data)
+{
+ GstCDXAStrip *cdxa = GST_CDXASTRIP (gst_pad_get_parent (pad));
+ GstBuffer *buf, *sub;
+ gint sync;
+
+ if (GST_IS_EVENT (data)) {
+ gst_cdxastrip_handle_event (cdxa, GST_EVENT (data));
+ return;
+ }
+
+ buf = GST_BUFFER (data);
+ if (cdxa->cache) {
+ buf = gst_buffer_join (cdxa->cache, buf);
+ }
+ cdxa->cache = NULL;
+
+ while (buf && GST_BUFFER_SIZE (buf) >= GST_CDXA_SECTOR_SIZE) {
+ /* sync */
+ sync = gst_cdxastrip_sync (buf);
+ if (sync < 0) {
+ gst_buffer_unref (buf);
+ return;
+ }
+ sub = gst_buffer_create_sub (buf, sync, GST_BUFFER_SIZE (buf) - sync);
+ gst_buffer_unref (buf);
+ buf = sub;
+ if (GST_BUFFER_SIZE (buf) < GST_CDXA_SECTOR_SIZE)
+ break;
+
+ /* one chunk */
+ sub = gst_cdxastrip_strip (gst_buffer_ref (buf));
+ gst_pad_push (cdxa->srcpad, GST_DATA (sub));
+
+ /* cache */
+ if (GST_BUFFER_SIZE (buf) != GST_CDXA_SECTOR_SIZE) {
+ sub = gst_buffer_create_sub (buf, GST_CDXA_SECTOR_SIZE,
+ GST_BUFFER_SIZE (buf) - GST_CDXA_SECTOR_SIZE);
+ } else {
+ sub = NULL;
+ }
+ gst_buffer_unref (buf);
+ buf = sub;
+ }
+
+ cdxa->cache = buf;
+}
+
+static GstElementStateReturn
+gst_cdxastrip_change_state (GstElement * element)
+{
+ GstCDXAStrip *cdxa = GST_CDXASTRIP (element);
+
+ switch (GST_STATE_TRANSITION (element)) {
+ case GST_STATE_PAUSED_TO_READY:
+ if (cdxa->cache) {
+ gst_buffer_unref (cdxa->cache);
+ cdxa->cache = NULL;
+ }
+ break;
+ default:
+ break;
+ }
+
+ if (parent_class->change_state)
+ return parent_class->change_state (element);
+
+ return GST_STATE_SUCCESS;
+}