--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/gst_plugins_base/gst-libs/gst/tag/gsttagdemux.c Thu Dec 17 08:53:32 2009 +0200
@@ -0,0 +1,1469 @@
+/* GStreamer Base Class for Tag Demuxing
+ * Copyright (C) 2005 Jan Schmidt <thaytan@mad.scientist.com>
+ * Copyright (C) 2006-2007 Tim-Philipp Müller <tim centricular 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.
+ */
+
+/**
+ * SECTION:gsttagdemux
+ * @see_also: GstApeDemux, GstID3Demux
+ * @short_description: Base class for demuxing tags that are in chunks
+ * directly at the beginning or at the end of a file
+ *
+ * <refsect2>
+ * <para>
+ * Provides a base class for demuxing tags at the beginning or end of a
+ * stream and handles things like typefinding, querying, seeking, and
+ * different modes of operation (chain-based, pull_range-based, and providing
+ * downstream elements with random access if upstream supports that). The tag
+ * is stripped from the output, and all offsets are adjusted for the tag
+ * sizes, so that to the downstream element the stream will appear as if
+ * there was no tag at all. Also, once the tag has been parsed, GstTagDemux
+ * will try to determine the media type of the resulting stream and add a
+ * source pad with the appropriate caps in order to facilitate auto-plugging.
+ * </para>
+ * <title>Deriving from GstTagDemux</title>
+ * <para>
+ * Subclasses have to do four things:
+ * <itemizedlist>
+ * <listitem><para>
+ * In their base init function, they must add a pad template for the sink
+ * pad to the element class, describing the media type they can parse in
+ * the caps of the pad template.
+ * </para></listitem>
+ * <listitem><para>
+ * In their class init function, they must override
+ * GST_TAG_DEMUX_CLASS(demux_klass)->identify_tag with their own identify
+ * function.
+ * </para></listitem>
+ * <listitem><para>
+ * In their class init function, they must override
+ * GST_TAG_DEMUX_CLASS(demux_klass)->parse_tag with their own parse
+ * function.
+ * </para></listitem>
+ * <listitem><para>
+ * In their class init function, they must also set
+ * GST_TAG_DEMUX_CLASS(demux_klass)->min_start_size and/or
+ * GST_TAG_DEMUX_CLASS(demux_klass)->min_end_size to the minimum size required
+ * for the identify function to decide whether the stream has a supported tag
+ * or not. A class parsing ID3v1 tags, for example, would set min_end_size to
+ * 128 bytes.
+ * </para></listitem>
+ * </itemizedlist>
+ * </para>
+ * </refsect2>
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include "gsttagdemux.h"
+
+#include <gst/base/gsttypefindhelper.h>
+#ifndef __SYMBIAN32__
+#include <gst/gst-i18n-plugin.h>
+#else
+#include "gst/gst-i18n-plugin.h"
+#endif
+#include <string.h>
+
+typedef enum
+{
+ GST_TAG_DEMUX_READ_START_TAG,
+ GST_TAG_DEMUX_TYPEFINDING,
+ GST_TAG_DEMUX_STREAMING
+} GstTagDemuxState;
+
+struct _GstTagDemuxPrivate
+{
+ GstPad *srcpad;
+ GstPad *sinkpad;
+
+ /* Number of bytes to remove from the
+ * start of file (tag at beginning) */
+ guint strip_start;
+
+ /* Number of bytes to remove from the
+ * end of file (tag at end) */
+ guint strip_end;
+
+ gint64 upstream_size;
+
+ GstTagDemuxState state;
+ GstBuffer *collect;
+ GstCaps *src_caps;
+
+ GstTagList *event_tags;
+ GstTagList *parsed_tags;
+ gboolean send_tag_event;
+
+ GstSegment segment;
+ gboolean need_newseg;
+ gboolean newseg_update;
+};
+
+/* Require at least 8kB of data before we attempt typefind.
+ * Seems a decent value based on test files
+ * 40kB is massive overkill for the maximum, I think, but it
+ * doesn't do any harm (tpm: increased to 64kB after watching
+ * typefinding fail on a wavpack file that needed 42kB to succeed) */
+#define TYPE_FIND_MIN_SIZE 8192
+#define TYPE_FIND_MAX_SIZE 65536
+
+GST_DEBUG_CATEGORY_STATIC (tagdemux_debug);
+#define GST_CAT_DEFAULT (tagdemux_debug)
+
+static GstStaticPadTemplate src_factory = GST_STATIC_PAD_TEMPLATE ("src",
+ GST_PAD_SRC,
+ GST_PAD_SOMETIMES,
+ GST_STATIC_CAPS ("ANY")
+ );
+
+static void gst_tag_demux_dispose (GObject * object);
+
+static GstFlowReturn gst_tag_demux_chain (GstPad * pad, GstBuffer * buf);
+static gboolean gst_tag_demux_sink_event (GstPad * pad, GstEvent * event);
+
+static gboolean gst_tag_demux_src_activate_pull (GstPad * pad, gboolean active);
+static GstFlowReturn gst_tag_demux_read_range (GstTagDemux * tagdemux,
+ guint64 offset, guint length, GstBuffer ** buffer);
+
+static gboolean gst_tag_demux_src_checkgetrange (GstPad * srcpad);
+static GstFlowReturn gst_tag_demux_src_getrange (GstPad * srcpad,
+ guint64 offset, guint length, GstBuffer ** buffer);
+
+static gboolean gst_tag_demux_add_srcpad (GstTagDemux * tagdemux,
+ GstCaps * new_caps);
+static gboolean gst_tag_demux_remove_srcpad (GstTagDemux * tagdemux);
+
+static gboolean gst_tag_demux_srcpad_event (GstPad * pad, GstEvent * event);
+static gboolean gst_tag_demux_sink_activate (GstPad * sinkpad);
+static GstStateChangeReturn gst_tag_demux_change_state (GstElement * element,
+ GstStateChange transition);
+static gboolean gst_tag_demux_pad_query (GstPad * pad, GstQuery * query);
+static const GstQueryType *gst_tag_demux_get_query_types (GstPad * pad);
+static gboolean gst_tag_demux_get_upstream_size (GstTagDemux * tagdemux);
+static void gst_tag_demux_send_tag_event (GstTagDemux * tagdemux);
+static gboolean gst_tag_demux_send_new_segment (GstTagDemux * tagdemux);
+
+static void gst_tag_demux_base_init (gpointer g_class);
+static void gst_tag_demux_class_init (gpointer g_class, gpointer d);
+static void gst_tag_demux_init (GstTagDemux * obj, GstTagDemuxClass * klass);
+
+static gpointer parent_class; /* NULL */
+
+/* Cannot use boilerplate macros here because we want the abstract flag */
+#ifdef __SYMBIAN32__
+EXPORT_C
+#endif
+
+GType
+gst_tag_demux_get_type (void)
+{
+ static GType object_type; /* 0 */
+
+ if (object_type == 0) {
+ static const GTypeInfo object_info = {
+ sizeof (GstTagDemuxClass),
+ gst_tag_demux_base_init,
+ NULL, /* base_finalize */
+ gst_tag_demux_class_init,
+ NULL, /* class_finalize */
+ NULL, /* class_data */
+ sizeof (GstTagDemux),
+ 0, /* n_preallocs */
+ (GInstanceInitFunc) gst_tag_demux_init
+ };
+
+ object_type = g_type_register_static (GST_TYPE_ELEMENT,
+ "GstTagDemux", &object_info, G_TYPE_FLAG_ABSTRACT);
+ }
+
+ return object_type;
+}
+
+static void
+gst_tag_demux_base_init (gpointer klass)
+{
+ GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
+
+ gst_element_class_add_pad_template (element_class,
+ gst_static_pad_template_get (&src_factory));
+
+ GST_DEBUG_CATEGORY_INIT (tagdemux_debug, "tagdemux", 0,
+ "tag demux base class");
+}
+
+static void
+gst_tag_demux_class_init (gpointer klass, gpointer d)
+{
+ GstTagDemuxClass *tagdemux_class = GST_TAG_DEMUX_CLASS (klass);
+ GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
+ GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
+
+ parent_class = g_type_class_peek_parent (klass);
+
+ gobject_class->dispose = gst_tag_demux_dispose;
+
+ element_class->change_state = GST_DEBUG_FUNCPTR (gst_tag_demux_change_state);
+
+ g_type_class_add_private (klass, sizeof (GstTagDemuxPrivate));
+
+ /* subclasses must set at least one of these */
+ tagdemux_class->min_start_size = 0;
+ tagdemux_class->min_end_size = 0;
+}
+
+static void
+gst_tag_demux_reset (GstTagDemux * tagdemux)
+{
+ GstBuffer **buffer_p = &tagdemux->priv->collect;
+ GstCaps **caps_p = &tagdemux->priv->src_caps;
+
+ tagdemux->priv->strip_start = 0;
+ tagdemux->priv->strip_end = 0;
+ tagdemux->priv->upstream_size = -1;
+ tagdemux->priv->state = GST_TAG_DEMUX_READ_START_TAG;
+ tagdemux->priv->send_tag_event = FALSE;
+
+ gst_buffer_replace (buffer_p, NULL);
+ gst_caps_replace (caps_p, NULL);
+
+ gst_tag_demux_remove_srcpad (tagdemux);
+
+ if (tagdemux->priv->event_tags) {
+ gst_tag_list_free (tagdemux->priv->event_tags);
+ tagdemux->priv->event_tags = NULL;
+ }
+ if (tagdemux->priv->parsed_tags) {
+ gst_tag_list_free (tagdemux->priv->parsed_tags);
+ tagdemux->priv->parsed_tags = NULL;
+ }
+
+ gst_segment_init (&tagdemux->priv->segment, GST_FORMAT_UNDEFINED);
+ tagdemux->priv->need_newseg = TRUE;
+ tagdemux->priv->newseg_update = FALSE;
+}
+
+static void
+gst_tag_demux_init (GstTagDemux * demux, GstTagDemuxClass * gclass)
+{
+ GstElementClass *element_klass = GST_ELEMENT_CLASS (gclass);
+ GstPadTemplate *tmpl;
+
+ demux->priv = g_type_instance_get_private ((GTypeInstance *) demux,
+ GST_TYPE_TAG_DEMUX);
+
+ tmpl = gst_element_class_get_pad_template (element_klass, "sink");
+ if (tmpl) {
+ demux->priv->sinkpad = gst_pad_new_from_template (tmpl, "sink");
+
+ gst_pad_set_activate_function (demux->priv->sinkpad,
+ GST_DEBUG_FUNCPTR (gst_tag_demux_sink_activate));
+ gst_pad_set_event_function (demux->priv->sinkpad,
+ GST_DEBUG_FUNCPTR (gst_tag_demux_sink_event));
+ gst_pad_set_chain_function (demux->priv->sinkpad,
+ GST_DEBUG_FUNCPTR (gst_tag_demux_chain));
+ gst_element_add_pad (GST_ELEMENT (demux), demux->priv->sinkpad);
+ }
+
+ gst_tag_demux_reset (demux);
+}
+
+static void
+gst_tag_demux_dispose (GObject * object)
+{
+ GstTagDemux *tagdemux = GST_TAG_DEMUX (object);
+
+ gst_tag_demux_reset (tagdemux);
+
+ G_OBJECT_CLASS (parent_class)->dispose (object);
+}
+
+static gboolean
+gst_tag_demux_add_srcpad (GstTagDemux * tagdemux, GstCaps * new_caps)
+{
+ GstPad *srcpad = NULL;
+
+ if (tagdemux->priv->src_caps == NULL ||
+ !gst_caps_is_equal (new_caps, tagdemux->priv->src_caps)) {
+
+ gst_caps_replace (&tagdemux->priv->src_caps, new_caps);
+
+ if (tagdemux->priv->srcpad != NULL) {
+ GST_DEBUG_OBJECT (tagdemux, "Changing src pad caps to %" GST_PTR_FORMAT,
+ tagdemux->priv->src_caps);
+
+ gst_pad_set_caps (tagdemux->priv->srcpad, tagdemux->priv->src_caps);
+ }
+ } else {
+ /* Caps never changed */
+ }
+
+ if (tagdemux->priv->srcpad == NULL) {
+ srcpad = tagdemux->priv->srcpad =
+ gst_pad_new_from_template (gst_element_class_get_pad_template
+ (GST_ELEMENT_GET_CLASS (tagdemux), "src"), "src");
+ g_return_val_if_fail (tagdemux->priv->srcpad != NULL, FALSE);
+
+ gst_pad_set_query_type_function (tagdemux->priv->srcpad,
+ GST_DEBUG_FUNCPTR (gst_tag_demux_get_query_types));
+ gst_pad_set_query_function (tagdemux->priv->srcpad,
+ GST_DEBUG_FUNCPTR (gst_tag_demux_pad_query));
+ gst_pad_set_event_function (tagdemux->priv->srcpad,
+ GST_DEBUG_FUNCPTR (gst_tag_demux_srcpad_event));
+ gst_pad_set_activatepull_function (tagdemux->priv->srcpad,
+ GST_DEBUG_FUNCPTR (gst_tag_demux_src_activate_pull));
+ gst_pad_set_checkgetrange_function (tagdemux->priv->srcpad,
+ GST_DEBUG_FUNCPTR (gst_tag_demux_src_checkgetrange));
+ gst_pad_set_getrange_function (tagdemux->priv->srcpad,
+ GST_DEBUG_FUNCPTR (gst_tag_demux_src_getrange));
+
+ gst_pad_use_fixed_caps (tagdemux->priv->srcpad);
+
+ if (tagdemux->priv->src_caps)
+ gst_pad_set_caps (tagdemux->priv->srcpad, tagdemux->priv->src_caps);
+
+ GST_DEBUG_OBJECT (tagdemux, "Adding src pad with caps %" GST_PTR_FORMAT,
+ tagdemux->priv->src_caps);
+
+ gst_object_ref (tagdemux->priv->srcpad);
+ gst_pad_set_active (tagdemux->priv->srcpad, TRUE);
+ if (!gst_element_add_pad (GST_ELEMENT (tagdemux), tagdemux->priv->srcpad))
+ return FALSE;
+ gst_element_no_more_pads (GST_ELEMENT (tagdemux));
+ }
+
+ return TRUE;
+}
+
+static gboolean
+gst_tag_demux_remove_srcpad (GstTagDemux * demux)
+{
+ gboolean res = TRUE;
+
+ if (demux->priv->srcpad != NULL) {
+ GST_DEBUG_OBJECT (demux, "Removing src pad");
+ res = gst_element_remove_pad (GST_ELEMENT (demux), demux->priv->srcpad);
+ g_return_val_if_fail (res != FALSE, FALSE);
+ gst_object_unref (demux->priv->srcpad);
+ demux->priv->srcpad = NULL;
+ }
+
+ return res;
+};
+
+/* will return FALSE if buffer is beyond end of data; will return TRUE
+ * if buffer was trimmed successfully or didn't need trimming, but may
+ * also return TRUE and set *buf_ref to NULL if the buffer was before
+ * the start of the data */
+static gboolean
+gst_tag_demux_trim_buffer (GstTagDemux * tagdemux, GstBuffer ** buf_ref)
+{
+ GstBuffer *buf = *buf_ref;
+
+ guint trim_start = 0;
+ guint out_size = GST_BUFFER_SIZE (buf);
+ guint64 out_offset = GST_BUFFER_OFFSET (buf);
+ gboolean need_sub = FALSE;
+
+ /* Adjust offset and length */
+ if (!GST_BUFFER_OFFSET_IS_VALID (buf)) {
+ /* Can't change anything without an offset */
+ return TRUE;
+ }
+
+ /* If the buffer crosses the tag at the end of file, trim it */
+ if (tagdemux->priv->strip_end > 0) {
+ if (gst_tag_demux_get_upstream_size (tagdemux)) {
+ guint64 v1tag_offset =
+ tagdemux->priv->upstream_size - tagdemux->priv->strip_end;
+
+ if (out_offset >= v1tag_offset) {
+ GST_DEBUG_OBJECT (tagdemux, "Buffer is past the end of the data");
+ goto no_out_buffer_end;
+ }
+
+ if (out_offset + out_size > v1tag_offset) {
+ out_size = v1tag_offset - out_offset;
+ need_sub = TRUE;
+ }
+ }
+ }
+
+ if (tagdemux->priv->strip_start > 0) {
+ /* If the buffer crosses the tag at the start of file, trim it */
+ if (out_offset <= tagdemux->priv->strip_start) {
+ if (out_offset + out_size <= tagdemux->priv->strip_start) {
+ GST_DEBUG_OBJECT (tagdemux, "Buffer is before the start of the data");
+ goto no_out_buffer_start;
+ }
+
+ trim_start = tagdemux->priv->strip_start - out_offset;
+ out_size -= trim_start;
+ out_offset = 0;
+ } else {
+ out_offset -= tagdemux->priv->strip_start;
+ }
+ need_sub = TRUE;
+ }
+
+ g_assert (out_size > 0);
+
+ if (need_sub == TRUE) {
+ if (out_size != GST_BUFFER_SIZE (buf) || !gst_buffer_is_writable (buf)) {
+ GstBuffer *sub;
+
+ GST_DEBUG_OBJECT (tagdemux, "Sub-buffering to trim size %d offset %"
+ G_GINT64_FORMAT " to %d offset %" G_GINT64_FORMAT,
+ GST_BUFFER_SIZE (buf), GST_BUFFER_OFFSET (buf), out_size, out_offset);
+
+ sub = gst_buffer_create_sub (buf, trim_start, out_size);
+ g_return_val_if_fail (sub != NULL, FALSE);
+ gst_buffer_unref (buf);
+ *buf_ref = buf = sub;
+ } else {
+ GST_DEBUG_OBJECT (tagdemux, "Adjusting buffer from size %d offset %"
+ G_GINT64_FORMAT " to %d offset %" G_GINT64_FORMAT,
+ GST_BUFFER_SIZE (buf), GST_BUFFER_OFFSET (buf), out_size, out_offset);
+ }
+
+ GST_BUFFER_OFFSET (buf) = out_offset;
+ GST_BUFFER_OFFSET_END (buf) = out_offset + out_size;
+ gst_buffer_set_caps (buf, tagdemux->priv->src_caps);
+ }
+
+ return TRUE;
+
+no_out_buffer_end:
+ {
+ gst_buffer_unref (buf);
+ *buf_ref = NULL;
+ return FALSE;
+ }
+no_out_buffer_start:
+ {
+ gst_buffer_unref (buf);
+ *buf_ref = NULL;
+ return TRUE;
+ }
+}
+
+static void
+gst_tag_demux_chain_parse_tag (GstTagDemux * demux, GstBuffer * collect)
+{
+ GstTagDemuxResult parse_ret;
+ GstTagDemuxClass *klass;
+ guint tagsize = 0;
+ guint available;
+
+ g_assert (gst_buffer_is_metadata_writable (collect));
+
+ klass = GST_TAG_DEMUX_CLASS (G_OBJECT_GET_CLASS (demux));
+
+ /* If we receive a buffer that's from the middle of the file,
+ * we can't read tags so move to typefinding */
+ if (GST_BUFFER_OFFSET_IS_VALID (collect) && GST_BUFFER_OFFSET (collect) != 0) {
+ GST_DEBUG_OBJECT (demux, "Received buffer from non-zero offset %"
+ G_GINT64_FORMAT ". Can't read tags", GST_BUFFER_OFFSET (collect));
+ demux->priv->state = GST_TAG_DEMUX_TYPEFINDING;
+ return;
+ }
+
+ g_assert (klass->identify_tag != NULL);
+ g_assert (klass->parse_tag != NULL);
+
+ available = GST_BUFFER_SIZE (collect);
+
+ if (available < klass->min_start_size) {
+ GST_DEBUG_OBJECT (demux, "Only %u bytes available, but %u needed "
+ "to identify tag", available, klass->min_start_size);
+ return; /* wait for more data */
+ }
+
+ if (!klass->identify_tag (demux, collect, TRUE, &tagsize)) {
+ GST_DEBUG_OBJECT (demux, "Could not identify start tag");
+ demux->priv->state = GST_TAG_DEMUX_TYPEFINDING;
+ return;
+ }
+
+ /* need to set offset of first buffer to 0 or trimming won't work */
+ if (!GST_BUFFER_OFFSET_IS_VALID (collect)) {
+ GST_WARNING_OBJECT (demux, "Fixing up first buffer without offset");
+ GST_BUFFER_OFFSET (collect) = 0;
+ }
+
+ GST_DEBUG_OBJECT (demux, "Identified tag, size = %u bytes", tagsize);
+
+ do {
+ GstTagList *tags = NULL;
+ guint newsize, saved_size;
+
+ demux->priv->strip_start = tagsize;
+
+ if (available < tagsize) {
+ GST_DEBUG_OBJECT (demux, "Only %u bytes available, but %u needed "
+ "to parse tag", available, tagsize);
+ return; /* wait for more data */
+ }
+
+ saved_size = GST_BUFFER_SIZE (collect);
+ GST_BUFFER_SIZE (collect) = tagsize;
+ newsize = tagsize;
+
+ parse_ret = klass->parse_tag (demux, collect, TRUE, &newsize, &tags);
+
+ GST_BUFFER_SIZE (collect) = saved_size;
+
+ switch (parse_ret) {
+ case GST_TAG_DEMUX_RESULT_OK:
+ demux->priv->strip_start = newsize;
+ demux->priv->parsed_tags = tags;
+ GST_DEBUG_OBJECT (demux, "Read start tag of size %u", newsize);
+ break;
+ case GST_TAG_DEMUX_RESULT_BROKEN_TAG:
+ demux->priv->strip_start = newsize;
+ demux->priv->parsed_tags = tags;
+ GST_WARNING_OBJECT (demux, "Ignoring broken start tag of size %d",
+ demux->priv->strip_start);
+ break;
+ case GST_TAG_DEMUX_RESULT_AGAIN:
+ GST_DEBUG_OBJECT (demux, "Re-parse, this time with %u bytes", newsize);
+ g_assert (newsize != tagsize);
+ tagsize = newsize;
+ break;
+ }
+ } while (parse_ret == GST_TAG_DEMUX_RESULT_AGAIN);
+
+ GST_LOG_OBJECT (demux, "Parsed tag. Proceeding to typefinding");
+ demux->priv->state = GST_TAG_DEMUX_TYPEFINDING;
+ demux->priv->send_tag_event = TRUE;
+}
+
+static GstFlowReturn
+gst_tag_demux_chain (GstPad * pad, GstBuffer * buf)
+{
+ GstTagDemux *demux;
+
+ demux = GST_TAG_DEMUX (GST_PAD_PARENT (pad));
+
+ /* Update our segment last_stop info */
+ if (demux->priv->segment.format == GST_FORMAT_BYTES) {
+ if (GST_BUFFER_OFFSET_IS_VALID (buf))
+ demux->priv->segment.last_stop = GST_BUFFER_OFFSET (buf);
+ demux->priv->segment.last_stop += GST_BUFFER_SIZE (buf);
+ } else if (demux->priv->segment.format == GST_FORMAT_TIME) {
+ if (GST_BUFFER_TIMESTAMP_IS_VALID (buf))
+ demux->priv->segment.last_stop = GST_BUFFER_TIMESTAMP (buf);
+ if (GST_BUFFER_DURATION_IS_VALID (buf))
+ demux->priv->segment.last_stop += GST_BUFFER_DURATION (buf);
+ }
+
+ if (demux->priv->collect == NULL) {
+ demux->priv->collect = buf;
+ } else {
+ demux->priv->collect = gst_buffer_join (demux->priv->collect, buf);
+ }
+ buf = NULL;
+
+ switch (demux->priv->state) {
+ case GST_TAG_DEMUX_READ_START_TAG:
+ demux->priv->collect =
+ gst_buffer_make_metadata_writable (demux->priv->collect);
+ gst_tag_demux_chain_parse_tag (demux, demux->priv->collect);
+ if (demux->priv->state != GST_TAG_DEMUX_TYPEFINDING)
+ break;
+ /* Fall-through */
+ case GST_TAG_DEMUX_TYPEFINDING:{
+ GstTypeFindProbability probability = 0;
+ GstBuffer *typefind_buf = NULL;
+ GstCaps *caps;
+
+ if (GST_BUFFER_SIZE (demux->priv->collect) <
+ TYPE_FIND_MIN_SIZE + demux->priv->strip_start)
+ break; /* Go get more data first */
+
+ GST_DEBUG_OBJECT (demux, "Typefinding with size %d",
+ GST_BUFFER_SIZE (demux->priv->collect));
+
+ /* Trim the buffer and adjust offset for typefinding */
+ typefind_buf = demux->priv->collect;
+ gst_buffer_ref (typefind_buf);
+ if (!gst_tag_demux_trim_buffer (demux, &typefind_buf))
+ return GST_FLOW_UNEXPECTED;
+
+ if (typefind_buf == NULL)
+ break; /* Still need more data */
+
+ caps = gst_type_find_helper_for_buffer (GST_OBJECT (demux),
+ typefind_buf, &probability);
+
+ if (caps == NULL) {
+ if (GST_BUFFER_SIZE (typefind_buf) < TYPE_FIND_MAX_SIZE) {
+ /* Just break for more data */
+ gst_buffer_unref (typefind_buf);
+ return GST_FLOW_OK;
+ }
+
+ /* We failed typefind */
+ GST_ELEMENT_ERROR (demux, STREAM, TYPE_NOT_FOUND, (NULL),
+ ("Could not detect type for contents within tag"));
+ gst_buffer_unref (typefind_buf);
+ gst_buffer_unref (demux->priv->collect);
+ demux->priv->collect = NULL;
+ return GST_FLOW_ERROR;
+ }
+ gst_buffer_unref (typefind_buf);
+
+ GST_DEBUG_OBJECT (demux, "Found type %" GST_PTR_FORMAT " with a "
+ "probability of %u", caps, probability);
+
+ if (!gst_tag_demux_add_srcpad (demux, caps)) {
+ GST_DEBUG_OBJECT (demux, "Failed to add srcpad");
+ gst_caps_unref (caps);
+ goto error;
+ }
+ gst_caps_unref (caps);
+
+ /* Move onto streaming and fall-through to push out existing
+ * data */
+ demux->priv->state = GST_TAG_DEMUX_STREAMING;
+ /* fall-through */
+ }
+ case GST_TAG_DEMUX_STREAMING:{
+ GstBuffer *outbuf = NULL;
+
+ /* Trim the buffer and adjust offset */
+ if (demux->priv->collect) {
+ outbuf = demux->priv->collect;
+ demux->priv->collect = NULL;
+ if (!gst_tag_demux_trim_buffer (demux, &outbuf))
+ return GST_FLOW_UNEXPECTED;
+ }
+ if (outbuf) {
+ if (G_UNLIKELY (demux->priv->srcpad == NULL)) {
+ gst_buffer_unref (outbuf);
+ return GST_FLOW_ERROR;
+ }
+
+ /* Might need a new segment before the buffer */
+ if (demux->priv->need_newseg) {
+ if (!gst_tag_demux_send_new_segment (demux)) {
+ GST_WARNING_OBJECT (demux, "Downstream did not handle newsegment "
+ "event as it should");
+ }
+ demux->priv->need_newseg = FALSE;
+ }
+
+ /* Send pending tag event */
+ if (demux->priv->send_tag_event) {
+ gst_tag_demux_send_tag_event (demux);
+ demux->priv->send_tag_event = FALSE;
+ }
+
+ /* Ensure the caps are set correctly */
+ outbuf = gst_buffer_make_metadata_writable (outbuf);
+ gst_buffer_set_caps (outbuf, GST_PAD_CAPS (demux->priv->srcpad));
+
+ GST_LOG_OBJECT (demux, "Pushing buffer %p", outbuf);
+
+ return gst_pad_push (demux->priv->srcpad, outbuf);
+ }
+ }
+ }
+ return GST_FLOW_OK;
+
+error:
+ GST_DEBUG_OBJECT (demux, "error in chain function");
+
+ return GST_FLOW_ERROR;
+}
+
+static gboolean
+gst_tag_demux_sink_event (GstPad * pad, GstEvent * event)
+{
+ GstTagDemux *demux;
+ gboolean ret;
+
+ demux = GST_TAG_DEMUX (gst_pad_get_parent (pad));
+
+ switch (GST_EVENT_TYPE (event)) {
+ case GST_EVENT_EOS:
+ if (demux->priv->srcpad == NULL) {
+ GST_WARNING_OBJECT (demux, "EOS before we found a type");
+ GST_ELEMENT_ERROR (demux, STREAM, TYPE_NOT_FOUND, (NULL), (NULL));
+ }
+ ret = gst_pad_event_default (pad, event);
+ break;
+ case GST_EVENT_NEWSEGMENT:{
+ gboolean update;
+ gdouble rate, arate;
+ GstFormat format;
+ gint64 start, stop, position;
+
+ gst_event_parse_new_segment_full (event, &update, &rate, &arate,
+ &format, &start, &stop, &position);
+
+ gst_segment_set_newsegment_full (&demux->priv->segment, update, rate,
+ arate, format, start, stop, position);
+ demux->priv->newseg_update = update;
+ demux->priv->need_newseg = TRUE;
+ gst_event_unref (event);
+ ret = TRUE;
+ break;
+ }
+ default:
+ ret = gst_pad_event_default (pad, event);
+ break;
+ }
+
+ gst_object_unref (demux);
+ return ret;
+}
+
+static gboolean
+gst_tag_demux_get_upstream_size (GstTagDemux * tagdemux)
+{
+ GstFormat format;
+ gint64 len;
+
+ /* Short-cut if we already queried upstream */
+ if (tagdemux->priv->upstream_size > 0)
+ return TRUE;
+
+ format = GST_FORMAT_BYTES;
+ if (!gst_pad_query_peer_duration (tagdemux->priv->sinkpad, &format, &len) ||
+ len <= 0) {
+ return FALSE;
+ }
+
+ tagdemux->priv->upstream_size = len;
+ return TRUE;
+}
+
+static gboolean
+gst_tag_demux_srcpad_event (GstPad * pad, GstEvent * event)
+{
+ GstTagDemux *tagdemux;
+ gboolean res = FALSE;
+
+ tagdemux = GST_TAG_DEMUX (gst_pad_get_parent (pad));
+
+ /* Handle SEEK events, with adjusted byte offsets and sizes. */
+
+ switch (GST_EVENT_TYPE (event)) {
+ case GST_EVENT_SEEK:
+ {
+ gdouble rate;
+ GstFormat format;
+ GstSeekType cur_type, stop_type;
+ GstSeekFlags flags;
+ gint64 cur, stop;
+
+ gst_event_parse_seek (event, &rate, &format, &flags,
+ &cur_type, &cur, &stop_type, &stop);
+
+ if (format == GST_FORMAT_BYTES &&
+ tagdemux->priv->state == GST_TAG_DEMUX_STREAMING &&
+ gst_pad_is_linked (tagdemux->priv->sinkpad)) {
+ GstEvent *upstream;
+
+ switch (cur_type) {
+ case GST_SEEK_TYPE_SET:
+ if (cur == -1)
+ cur = 0;
+ cur += tagdemux->priv->strip_start;
+ break;
+ case GST_SEEK_TYPE_CUR:
+ break;
+ case GST_SEEK_TYPE_END:
+ /* Adjust the seek to be relative to the start of any end tag
+ * (note: 10 bytes before end is represented by stop=-10) */
+ if (cur > 0)
+ cur = 0;
+ cur -= tagdemux->priv->strip_end;
+ break;
+ case GST_SEEK_TYPE_NONE:
+ default:
+ break;
+ }
+ switch (stop_type) {
+ case GST_SEEK_TYPE_SET:
+ if (stop != -1) {
+ /* -1 means the end of the file, pass it upstream intact */
+ stop += tagdemux->priv->strip_start;
+ }
+ break;
+ case GST_SEEK_TYPE_CUR:
+ break;
+ case GST_SEEK_TYPE_END:
+ /* Adjust the seek to be relative to the start of any end tag
+ * (note: 10 bytes before end is represented by stop=-10) */
+ if (stop > 0)
+ stop = 0;
+ stop -= tagdemux->priv->strip_end;
+ break;
+ case GST_SEEK_TYPE_NONE:
+ default:
+ break;
+ }
+ upstream = gst_event_new_seek (rate, format, flags,
+ cur_type, cur, stop_type, stop);
+ res = gst_pad_push_event (tagdemux->priv->sinkpad, upstream);
+ }
+ break;
+ }
+ default:
+ /* FIXME: shouldn't we pass unknown and unhandled events upstream? */
+ break;
+ }
+
+ gst_object_unref (tagdemux);
+ gst_event_unref (event);
+ return res;
+}
+
+/* Read and interpret any end tag when activating in pull_range.
+ * Returns FALSE if pad activation should fail. */
+static gboolean
+gst_tag_demux_pull_end_tag (GstTagDemux * demux, GstTagList ** tags)
+{
+ GstTagDemuxResult parse_ret;
+ GstTagDemuxClass *klass;
+ GstFlowReturn flow_ret;
+ GstTagList *new_tags = NULL;
+ GstBuffer *buffer = NULL;
+ gboolean have_tag;
+ gboolean res = FALSE;
+ guint64 offset;
+ guint tagsize;
+
+ klass = GST_TAG_DEMUX_CLASS (G_OBJECT_GET_CLASS (demux));
+
+ g_assert (klass->identify_tag != NULL);
+ g_assert (klass->parse_tag != NULL);
+
+ if (klass->min_end_size == 0) {
+ GST_DEBUG_OBJECT (demux, "Not looking for tag at the end");
+ return TRUE;
+ }
+
+ if (demux->priv->upstream_size < klass->min_end_size) {
+ GST_DEBUG_OBJECT (demux, "File too small");
+ return TRUE;
+ }
+
+ /* Pull enough to identify the tag and retrieve its total size */
+ offset = demux->priv->upstream_size - klass->min_end_size;
+
+ flow_ret = gst_pad_pull_range (demux->priv->sinkpad, offset,
+ klass->min_end_size, &buffer);
+
+ if (flow_ret != GST_FLOW_OK) {
+ GST_DEBUG_OBJECT (demux, "Could not read tag header from end of file, "
+ "ret = %s", gst_flow_get_name (flow_ret));
+ goto done;
+ }
+
+ if (GST_BUFFER_SIZE (buffer) < klass->min_end_size) {
+ GST_DEBUG_OBJECT (demux, "Only managed to read %u bytes from file "
+ "(required: %u bytes)", GST_BUFFER_SIZE (buffer), klass->min_end_size);
+ goto done;
+ }
+
+ have_tag = klass->identify_tag (demux, buffer, FALSE, &tagsize);
+
+ if (!have_tag) {
+ GST_DEBUG_OBJECT (demux, "Could not find tag at end");
+ goto done;
+ }
+
+ /* Now pull the entire tag */
+ do {
+ guint newsize, saved_size;
+
+ GST_DEBUG_OBJECT (demux, "Identified tag at end, size=%u bytes", tagsize);
+
+ demux->priv->strip_end = tagsize;
+
+ g_assert (tagsize >= klass->min_end_size);
+
+ /* Get buffer that's exactly the requested size */
+ if (GST_BUFFER_SIZE (buffer) != tagsize) {
+ gst_buffer_unref (buffer);
+ buffer = NULL;
+
+ offset = demux->priv->upstream_size - tagsize;
+
+ flow_ret = gst_pad_pull_range (demux->priv->sinkpad, offset,
+ tagsize, &buffer);
+
+ if (flow_ret != GST_FLOW_OK) {
+ GST_DEBUG_OBJECT (demux, "Could not read data from end of file at "
+ "offset %" G_GUINT64_FORMAT ". ret = %s", offset,
+ gst_flow_get_name (flow_ret));
+ goto done;
+ }
+
+ if (GST_BUFFER_SIZE (buffer) < tagsize) {
+ GST_DEBUG_OBJECT (demux, "Only managed to read %u bytes from file",
+ GST_BUFFER_SIZE (buffer));
+ goto done;
+ }
+ }
+
+ GST_BUFFER_OFFSET (buffer) = offset;
+
+ saved_size = GST_BUFFER_SIZE (buffer);
+ GST_BUFFER_SIZE (buffer) = tagsize;
+ newsize = tagsize;
+
+ parse_ret = klass->parse_tag (demux, buffer, FALSE, &newsize, &new_tags);
+
+ GST_BUFFER_SIZE (buffer) = saved_size;
+
+ switch (parse_ret) {
+ case GST_TAG_DEMUX_RESULT_OK:
+ res = TRUE;
+ demux->priv->strip_end = newsize;
+ GST_DEBUG_OBJECT (demux, "Read tag at end, size %d",
+ demux->priv->strip_end);
+ break;
+ case GST_TAG_DEMUX_RESULT_BROKEN_TAG:
+ res = TRUE;
+ demux->priv->strip_end = newsize;
+ GST_WARNING_OBJECT (demux, "Ignoring broken tag at end, size %d",
+ demux->priv->strip_end);
+ break;
+ case GST_TAG_DEMUX_RESULT_AGAIN:
+ GST_DEBUG_OBJECT (demux, "Re-parse, this time with %d bytes", newsize);
+ g_assert (newsize != tagsize);
+ tagsize = newsize;
+ break;
+ }
+ } while (parse_ret == GST_TAG_DEMUX_RESULT_AGAIN);
+
+ *tags = new_tags;
+ new_tags = NULL;
+
+done:
+ if (new_tags)
+ gst_tag_list_free (new_tags);
+ if (buffer)
+ gst_buffer_unref (buffer);
+ return res;
+}
+
+/* Read and interpret any tag at the start when activating in
+ * pull_range. Returns FALSE if pad activation should fail. */
+static gboolean
+gst_tag_demux_pull_start_tag (GstTagDemux * demux, GstTagList ** tags)
+{
+ GstTagDemuxResult parse_ret;
+ GstTagDemuxClass *klass;
+ GstFlowReturn flow_ret;
+ GstTagList *new_tags = NULL;
+ GstBuffer *buffer = NULL;
+ gboolean have_tag;
+ gboolean res = FALSE;
+ guint req, tagsize;
+
+ klass = GST_TAG_DEMUX_CLASS (G_OBJECT_GET_CLASS (demux));
+
+ g_assert (klass->identify_tag != NULL);
+ g_assert (klass->parse_tag != NULL);
+
+ if (klass->min_start_size == 0) {
+ GST_DEBUG_OBJECT (demux, "Not looking for tag at the beginning");
+ return TRUE;
+ }
+
+ /* Handle tag at start. Try with 4kB to start with */
+ req = MAX (klass->min_start_size, 4096);
+
+ /* Pull enough to identify the tag and retrieve its total size */
+ flow_ret = gst_pad_pull_range (demux->priv->sinkpad, 0, req, &buffer);
+ if (flow_ret != GST_FLOW_OK) {
+ GST_DEBUG_OBJECT (demux, "Could not read data from start of file ret=%s",
+ gst_flow_get_name (flow_ret));
+ goto done;
+ }
+
+ if (GST_BUFFER_SIZE (buffer) < klass->min_start_size) {
+ GST_DEBUG_OBJECT (demux, "Only managed to read %u bytes from file - "
+ "no tag in this file", GST_BUFFER_SIZE (buffer));
+ goto done;
+ }
+
+ have_tag = klass->identify_tag (demux, buffer, TRUE, &tagsize);
+
+ if (!have_tag) {
+ GST_DEBUG_OBJECT (demux, "Could not find start tag");
+ res = TRUE;
+ goto done;
+ }
+
+ GST_DEBUG_OBJECT (demux, "Identified start tag, size = %u bytes", tagsize);
+
+ do {
+ guint newsize, saved_size;
+
+ demux->priv->strip_start = tagsize;
+
+ /* Now pull the entire tag */
+ g_assert (tagsize >= klass->min_start_size);
+
+ if (GST_BUFFER_SIZE (buffer) < tagsize) {
+ gst_buffer_unref (buffer);
+ buffer = NULL;
+
+ flow_ret = gst_pad_pull_range (demux->priv->sinkpad, 0, tagsize, &buffer);
+ if (flow_ret != GST_FLOW_OK) {
+ GST_DEBUG_OBJECT (demux, "Could not read data from start of file, "
+ "ret = %s", gst_flow_get_name (flow_ret));
+ goto done;
+ }
+
+ if (GST_BUFFER_SIZE (buffer) < tagsize) {
+ GST_DEBUG_OBJECT (demux, "Only managed to read %u bytes from file",
+ GST_BUFFER_SIZE (buffer));
+ GST_ELEMENT_ERROR (demux, STREAM, DECODE,
+ (_("Failed to read tag: not enough data")), (NULL));
+ goto done;
+ }
+ }
+
+ saved_size = GST_BUFFER_SIZE (buffer);
+ GST_BUFFER_SIZE (buffer) = tagsize;
+ newsize = tagsize;
+ parse_ret = klass->parse_tag (demux, buffer, TRUE, &newsize, &new_tags);
+
+ GST_BUFFER_SIZE (buffer) = saved_size;
+
+ switch (parse_ret) {
+ case GST_TAG_DEMUX_RESULT_OK:
+ res = TRUE;
+ demux->priv->strip_start = newsize;
+ GST_DEBUG_OBJECT (demux, "Read start tag of size %d", newsize);
+ break;
+ case GST_TAG_DEMUX_RESULT_BROKEN_TAG:
+ res = TRUE;
+ demux->priv->strip_start = newsize;
+ GST_WARNING_OBJECT (demux, "Ignoring broken start tag of size %d",
+ demux->priv->strip_start);
+ break;
+ case GST_TAG_DEMUX_RESULT_AGAIN:
+ GST_DEBUG_OBJECT (demux, "Re-parse, this time with %d bytes", newsize);
+ g_assert (newsize != tagsize);
+ tagsize = newsize;
+ break;
+ }
+ } while (parse_ret == GST_TAG_DEMUX_RESULT_AGAIN);
+
+ *tags = new_tags;
+ new_tags = NULL;
+
+done:
+ if (new_tags)
+ gst_tag_list_free (new_tags);
+ if (buffer)
+ gst_buffer_unref (buffer);
+ return res;
+}
+
+/* This function operates similarly to gst_type_find_element_activate
+ * in the typefind element
+ * 1. try to activate in pull mode. if not, switch to push and succeed.
+ * 2. try to read tags in pull mode
+ * 3. typefind the contents
+ * 4. deactivate pull mode.
+ * 5. if we didn't find any caps, fail.
+ * 6. Add the srcpad
+ * 7. if the sink pad is activated, we are in pull mode. succeed.
+ * otherwise activate both pads in push mode and succeed.
+ */
+static gboolean
+gst_tag_demux_sink_activate (GstPad * sinkpad)
+{
+ GstTypeFindProbability probability = 0;
+ GstTagDemuxClass *klass;
+ GstTagDemux *demux;
+ GstTagList *start_tags = NULL;
+ GstTagList *end_tags = NULL;
+ gboolean e_tag_ok, s_tag_ok;
+ gboolean ret = FALSE;
+ GstCaps *caps = NULL;
+
+ demux = GST_TAG_DEMUX (GST_PAD_PARENT (sinkpad));
+ klass = GST_TAG_DEMUX_CLASS (G_OBJECT_GET_CLASS (demux));
+
+ /* 1: */
+ /* If we can activate pull_range upstream, then read any end and start
+ * tags, otherwise activate in push mode and the chain function will
+ * collect buffers, read the start tag and output a buffer to end
+ * preroll.
+ */
+ if (!gst_pad_check_pull_range (sinkpad) ||
+ !gst_pad_activate_pull (sinkpad, TRUE)) {
+ GST_DEBUG_OBJECT (demux, "No pull mode. Changing to push, but won't be "
+ "able to read end tags");
+ demux->priv->state = GST_TAG_DEMUX_READ_START_TAG;
+ return gst_pad_activate_push (sinkpad, TRUE);
+ }
+
+ /* Look for tags at start and end of file */
+ GST_DEBUG_OBJECT (demux, "Activated pull mode. Looking for tags");
+ if (!gst_tag_demux_get_upstream_size (demux))
+ return FALSE;
+
+ demux->priv->strip_start = 0;
+ demux->priv->strip_end = 0;
+
+ s_tag_ok = gst_tag_demux_pull_start_tag (demux, &start_tags);
+ e_tag_ok = gst_tag_demux_pull_end_tag (demux, &end_tags);
+
+ if (klass->merge_tags != NULL) {
+ demux->priv->parsed_tags = klass->merge_tags (demux, start_tags, end_tags);
+ } else {
+ /* we merge in REPLACE mode, so put the less important tags first, which
+ * we'll just assume is the end tag (subclasses may change this behaviour
+ * or make it configurable by overriding the merge_tags vfunc) */
+ demux->priv->parsed_tags =
+ gst_tag_list_merge (end_tags, start_tags, GST_TAG_MERGE_REPLACE);
+ }
+
+ if (start_tags)
+ gst_tag_list_free (start_tags);
+ if (end_tags)
+ gst_tag_list_free (end_tags);
+
+ if (!e_tag_ok && !s_tag_ok)
+ return FALSE;
+
+ if (demux->priv->parsed_tags != NULL) {
+ demux->priv->send_tag_event = TRUE;
+ }
+
+ /* 3 - Do typefinding on data */
+ caps = gst_type_find_helper_get_range (GST_OBJECT (demux),
+ (GstTypeFindHelperGetRangeFunction) gst_tag_demux_read_range,
+ demux->priv->upstream_size
+ - (demux->priv->strip_start + demux->priv->strip_end), &probability);
+
+ GST_DEBUG_OBJECT (demux, "Found type %" GST_PTR_FORMAT " with a "
+ "probability of %u", caps, probability);
+
+ /* 4 - Deactivate pull mode */
+ if (!gst_pad_activate_pull (sinkpad, FALSE)) {
+ if (caps)
+ gst_caps_unref (caps);
+ GST_DEBUG_OBJECT (demux, "Could not deactivate sinkpad after reading tags");
+ return FALSE;
+ }
+
+ /* 5 - If we didn't find the caps, fail */
+ if (caps == NULL) {
+ GST_DEBUG_OBJECT (demux, "Could not detect type of contents");
+ GST_ELEMENT_ERROR (demux, STREAM, TYPE_NOT_FOUND, (NULL), (NULL));
+ goto done_activate;
+ }
+
+ /* tag reading and typefinding were already done, don't do them again in
+ * the chain function if we end up in push mode */
+ demux->priv->state = GST_TAG_DEMUX_STREAMING;
+
+ /* 6 Add the srcpad for output now we know caps. */
+ if (!gst_tag_demux_add_srcpad (demux, caps)) {
+ GST_DEBUG_OBJECT (demux, "Could not add source pad");
+ goto done_activate;
+ }
+
+ /* 7 - if the sinkpad is active, it was done by downstream so we're
+ * done, otherwise switch to push */
+ ret = TRUE;
+ if (!gst_pad_is_active (sinkpad)) {
+ ret = gst_pad_activate_push (demux->priv->srcpad, TRUE);
+ ret &= gst_pad_activate_push (sinkpad, TRUE);
+ }
+
+done_activate:
+
+ if (caps)
+ gst_caps_unref (caps);
+
+ return ret;
+}
+
+static gboolean
+gst_tag_demux_src_activate_pull (GstPad * pad, gboolean active)
+{
+ GstTagDemux *demux = GST_TAG_DEMUX (GST_PAD_PARENT (pad));
+
+ return gst_pad_activate_pull (demux->priv->sinkpad, active);
+}
+
+static gboolean
+gst_tag_demux_src_checkgetrange (GstPad * srcpad)
+{
+ GstTagDemux *demux = GST_TAG_DEMUX (GST_PAD_PARENT (srcpad));
+
+ return gst_pad_check_pull_range (demux->priv->sinkpad);
+}
+
+static GstFlowReturn
+gst_tag_demux_read_range (GstTagDemux * demux,
+ guint64 offset, guint length, GstBuffer ** buffer)
+{
+ GstFlowReturn ret;
+ guint64 in_offset;
+ guint in_length;
+
+ g_return_val_if_fail (buffer != NULL, GST_FLOW_ERROR);
+
+ /* Adjust offset and length of the request to trim off tag information.
+ * For the returned buffer, adjust the output offset to match what downstream
+ * should see */
+ in_offset = offset + demux->priv->strip_start;
+
+ if (!gst_tag_demux_get_upstream_size (demux))
+ return GST_FLOW_ERROR;
+
+ if (in_offset + length >= demux->priv->upstream_size - demux->priv->strip_end) {
+ if (in_offset + demux->priv->strip_end >= demux->priv->upstream_size)
+ return GST_FLOW_UNEXPECTED;
+ in_length = demux->priv->upstream_size - demux->priv->strip_end - in_offset;
+ } else {
+ in_length = length;
+ }
+
+ ret = gst_pad_pull_range (demux->priv->sinkpad, in_offset, in_length, buffer);
+
+ if (ret == GST_FLOW_OK && *buffer) {
+ if (!gst_tag_demux_trim_buffer (demux, buffer))
+ goto read_beyond_end;
+
+ /* this should only happen in streaming mode */
+ g_assert (*buffer != NULL);
+
+ gst_buffer_set_caps (*buffer, demux->priv->src_caps);
+ }
+
+ return ret;
+
+read_beyond_end:
+ {
+ GST_DEBUG_OBJECT (demux, "attempted read beyond end of file");
+ if (*buffer != NULL) {
+ gst_buffer_unref (buffer);
+ *buffer = NULL;
+ }
+ return GST_FLOW_UNEXPECTED;
+ }
+}
+
+static GstFlowReturn
+gst_tag_demux_src_getrange (GstPad * srcpad,
+ guint64 offset, guint length, GstBuffer ** buffer)
+{
+ GstTagDemux *demux = GST_TAG_DEMUX (GST_PAD_PARENT (srcpad));
+
+ if (demux->priv->send_tag_event) {
+ gst_tag_demux_send_tag_event (demux);
+ demux->priv->send_tag_event = FALSE;
+ }
+
+ return gst_tag_demux_read_range (demux, offset, length, buffer);
+}
+
+static GstStateChangeReturn
+gst_tag_demux_change_state (GstElement * element, GstStateChange transition)
+{
+ GstStateChangeReturn ret;
+ GstTagDemux *demux = GST_TAG_DEMUX (element);
+
+ ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
+
+ switch (transition) {
+ case GST_STATE_CHANGE_PAUSED_TO_READY:
+ gst_tag_demux_reset (demux);
+ break;
+ default:
+ break;
+ }
+ return ret;
+}
+
+static gboolean
+gst_tag_demux_pad_query (GstPad * pad, GstQuery * query)
+{
+ /* For a position or duration query, adjust the returned
+ * bytes to strip off the end and start areas */
+
+ GstTagDemux *demux = GST_TAG_DEMUX (GST_PAD_PARENT (pad));
+ GstPad *peer = NULL;
+ GstFormat format;
+ gint64 result;
+
+ if ((peer = gst_pad_get_peer (demux->priv->sinkpad)) == NULL)
+ return FALSE;
+
+ if (!gst_pad_query (peer, query)) {
+ gst_object_unref (peer);
+ return FALSE;
+ }
+
+ gst_object_unref (peer);
+
+ switch (GST_QUERY_TYPE (query)) {
+ case GST_QUERY_POSITION:
+ {
+ gst_query_parse_position (query, &format, &result);
+ if (format == GST_FORMAT_BYTES) {
+ result -= demux->priv->strip_start;
+ gst_query_set_position (query, format, result);
+ }
+ break;
+ }
+ case GST_QUERY_DURATION:
+ {
+ gst_query_parse_duration (query, &format, &result);
+ if (format == GST_FORMAT_BYTES) {
+ result -= demux->priv->strip_start + demux->priv->strip_end;
+ gst_query_set_duration (query, format, result);
+ }
+ break;
+ }
+ default:
+ break;
+ }
+
+ return TRUE;
+}
+
+static const GstQueryType *
+gst_tag_demux_get_query_types (GstPad * pad)
+{
+ static const GstQueryType types[] = {
+ GST_QUERY_POSITION,
+ GST_QUERY_DURATION,
+ 0
+ };
+
+ return types;
+}
+
+static void
+gst_tag_demux_send_tag_event (GstTagDemux * demux)
+{
+ /* FIXME: what's the correct merge mode? Docs need to tell... */
+ GstTagList *merged = gst_tag_list_merge (demux->priv->event_tags,
+ demux->priv->parsed_tags, GST_TAG_MERGE_KEEP);
+
+ if (demux->priv->parsed_tags)
+ gst_element_post_message (GST_ELEMENT (demux),
+ gst_message_new_tag (GST_OBJECT (demux),
+ gst_tag_list_copy (demux->priv->parsed_tags)));
+
+ if (merged) {
+ GstEvent *event = gst_event_new_tag (merged);
+
+ GST_EVENT_TIMESTAMP (event) = 0;
+ GST_DEBUG_OBJECT (demux, "Sending tag event on src pad");
+ gst_pad_push_event (demux->priv->srcpad, event);
+ }
+}
+
+static gboolean
+gst_tag_demux_send_new_segment (GstTagDemux * tagdemux)
+{
+ GstEvent *event;
+ gint64 start, stop, position;
+ GstSegment *seg = &tagdemux->priv->segment;
+
+ if (seg->format == GST_FORMAT_UNDEFINED) {
+ GST_LOG_OBJECT (tagdemux,
+ "No new segment received before first buffer. Using default");
+ gst_segment_set_newsegment (seg, FALSE, 1.0,
+ GST_FORMAT_BYTES, tagdemux->priv->strip_start, -1,
+ tagdemux->priv->strip_start);
+ }
+
+ /* Can't adjust segments in non-BYTES formats */
+ if (tagdemux->priv->segment.format != GST_FORMAT_BYTES) {
+ event = gst_event_new_new_segment_full (tagdemux->priv->newseg_update,
+ seg->rate, seg->applied_rate, seg->format, seg->start,
+ seg->stop, seg->time);
+ return gst_pad_push_event (tagdemux->priv->srcpad, event);
+ }
+
+ start = seg->start;
+ stop = seg->stop;
+ position = seg->time;
+
+ g_return_val_if_fail (start != -1, FALSE);
+ g_return_val_if_fail (position != -1, FALSE);
+
+ if (tagdemux->priv->strip_end > 0) {
+ if (gst_tag_demux_get_upstream_size (tagdemux)) {
+ guint64 v1tag_offset =
+ tagdemux->priv->upstream_size - tagdemux->priv->strip_end;
+
+ if (start >= v1tag_offset) {
+ /* Segment is completely within the end tag, output an open-ended
+ * segment, even though all the buffers will get trimmed away */
+ start = v1tag_offset;
+ stop = -1;
+ }
+
+ if (stop != -1 && stop >= v1tag_offset) {
+ GST_DEBUG_OBJECT (tagdemux,
+ "Segment crosses the end tag. Trimming end");
+ stop = v1tag_offset;
+ }
+ }
+ }
+
+ if (tagdemux->priv->strip_start > 0) {
+ if (start > tagdemux->priv->strip_start)
+ start -= tagdemux->priv->strip_start;
+ else
+ start = 0;
+
+ if (position > tagdemux->priv->strip_start)
+ position -= tagdemux->priv->strip_start;
+ else
+ position = 0;
+
+ if (stop != -1) {
+ if (stop > tagdemux->priv->strip_start)
+ stop -= tagdemux->priv->strip_start;
+ else
+ stop = 0;
+ }
+ }
+
+ GST_DEBUG_OBJECT (tagdemux,
+ "Sending new segment update %d, rate %g, format %d, "
+ "start %" G_GINT64_FORMAT ", stop %" G_GINT64_FORMAT ", position %"
+ G_GINT64_FORMAT, tagdemux->priv->newseg_update, seg->rate, seg->format,
+ start, stop, position);
+
+ event = gst_event_new_new_segment_full (tagdemux->priv->newseg_update,
+ seg->rate, seg->applied_rate, seg->format, start, stop, position);
+ return gst_pad_push_event (tagdemux->priv->srcpad, event);
+}