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.

1 files changed, 411 insertions, 0 deletions

diff --git a/gst/cdxaparse/gstcdxastrip.c b/gst/cdxaparse/gstcdxastrip.c
new file mode 100644
index 00000000..312c3028
--- /dev/null
+++ b/gst/cdxaparse/gstcdxastrip.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;
+}