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1552 lines
46 KiB
C
1552 lines
46 KiB
C
/* GStreamer Base Class for Tag Demuxing
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* Copyright (C) 2005 Jan Schmidt <thaytan@mad.scientist.com>
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* Copyright (C) 2006-2007 Tim-Philipp Müller <tim centricular net>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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/**
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* SECTION:gsttagdemux
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* @see_also: GstApeDemux, GstID3Demux
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* @short_description: Base class for demuxing tags that are in chunks
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* directly at the beginning or at the end of a file
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*
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* <refsect2>
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* <para>
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* Provides a base class for demuxing tags at the beginning or end of a
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* stream and handles things like typefinding, querying, seeking, and
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* different modes of operation (chain-based, pull_range-based, and providing
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* downstream elements with random access if upstream supports that). The tag
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* is stripped from the output, and all offsets are adjusted for the tag
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* sizes, so that to the downstream element the stream will appear as if
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* there was no tag at all. Also, once the tag has been parsed, GstTagDemux
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* will try to determine the media type of the resulting stream and add a
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* source pad with the appropriate caps in order to facilitate auto-plugging.
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* </para>
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* <title>Deriving from GstTagDemux</title>
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* <para>
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* Subclasses have to do four things:
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* <itemizedlist>
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* <listitem><para>
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* In their base init function, they must add a pad template for the sink
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* pad to the element class, describing the media type they can parse in
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* the caps of the pad template.
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* </para></listitem>
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* <listitem><para>
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* In their class init function, they must override
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* GST_TAG_DEMUX_CLASS(demux_klass)->identify_tag with their own identify
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* function.
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* </para></listitem>
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* <listitem><para>
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* In their class init function, they must override
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* GST_TAG_DEMUX_CLASS(demux_klass)->parse_tag with their own parse
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* function.
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* </para></listitem>
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* <listitem><para>
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* In their class init function, they must also set
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* GST_TAG_DEMUX_CLASS(demux_klass)->min_start_size and/or
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* GST_TAG_DEMUX_CLASS(demux_klass)->min_end_size to the minimum size required
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* for the identify function to decide whether the stream has a supported tag
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* or not. A class parsing ID3v1 tags, for example, would set min_end_size to
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* 128 bytes.
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* </para></listitem>
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* </itemizedlist>
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* </para>
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* </refsect2>
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include "gsttagdemux.h"
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#include <gst/base/gsttypefindhelper.h>
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#include <gst/gst-i18n-plugin.h>
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#include <string.h>
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typedef enum
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{
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GST_TAG_DEMUX_READ_START_TAG,
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GST_TAG_DEMUX_TYPEFINDING,
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GST_TAG_DEMUX_STREAMING
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} GstTagDemuxState;
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struct _GstTagDemuxPrivate
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{
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GstPad *srcpad;
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GstPad *sinkpad;
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/* Number of bytes to remove from the
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* start of file (tag at beginning) */
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guint strip_start;
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/* Number of bytes to remove from the
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* end of file (tag at end) */
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guint strip_end;
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gint64 upstream_size;
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GstTagDemuxState state;
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GstBuffer *collect;
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gsize collect_size;
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GstCaps *src_caps;
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GstTagList *event_tags;
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GstTagList *parsed_tags;
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gboolean send_tag_event;
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GstSegment segment;
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gboolean need_newseg;
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GList *pending_events;
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};
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/* Require at least 8kB of data before we attempt typefind.
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* Seems a decent value based on test files
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* 40kB is massive overkill for the maximum, I think, but it
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* doesn't do any harm (tpm: increased to 64kB after watching
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* typefinding fail on a wavpack file that needed 42kB to succeed) */
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#define TYPE_FIND_MIN_SIZE 8192
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#define TYPE_FIND_MAX_SIZE 65536
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GST_DEBUG_CATEGORY_STATIC (tagdemux_debug);
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#define GST_CAT_DEFAULT (tagdemux_debug)
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static GstStaticPadTemplate src_factory = GST_STATIC_PAD_TEMPLATE ("src",
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GST_PAD_SRC,
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GST_PAD_SOMETIMES,
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GST_STATIC_CAPS ("ANY")
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);
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static void gst_tag_demux_dispose (GObject * object);
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static GstFlowReturn gst_tag_demux_chain (GstPad * pad, GstBuffer * buf);
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static gboolean gst_tag_demux_sink_event (GstPad * pad, GstEvent * event);
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static gboolean gst_tag_demux_src_activate_pull (GstPad * pad, gboolean active);
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static GstFlowReturn gst_tag_demux_read_range (GstTagDemux * tagdemux,
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guint64 offset, guint length, GstBuffer ** buffer);
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static GstFlowReturn gst_tag_demux_src_getrange (GstPad * srcpad,
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guint64 offset, guint length, GstBuffer ** buffer);
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static gboolean gst_tag_demux_add_srcpad (GstTagDemux * tagdemux,
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GstCaps * new_caps);
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static gboolean gst_tag_demux_remove_srcpad (GstTagDemux * tagdemux);
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static gboolean gst_tag_demux_srcpad_event (GstPad * pad, GstEvent * event);
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static gboolean gst_tag_demux_sink_activate (GstPad * sinkpad);
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static GstStateChangeReturn gst_tag_demux_change_state (GstElement * element,
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GstStateChange transition);
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static gboolean gst_tag_demux_pad_query (GstPad * pad, GstQuery * query);
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static const GstQueryType *gst_tag_demux_get_query_types (GstPad * pad);
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static gboolean gst_tag_demux_get_upstream_size (GstTagDemux * tagdemux);
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static void gst_tag_demux_send_pending_events (GstTagDemux * tagdemux);
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static void gst_tag_demux_send_tag_event (GstTagDemux * tagdemux);
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static gboolean gst_tag_demux_send_new_segment (GstTagDemux * tagdemux);
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static void gst_tag_demux_base_init (gpointer g_class);
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static void gst_tag_demux_class_init (gpointer g_class, gpointer d);
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static void gst_tag_demux_init (GstTagDemux * obj, GstTagDemuxClass * klass);
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static gpointer parent_class; /* NULL */
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GType
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gst_tag_demux_result_get_type (void)
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{
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static GType etype = 0;
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if (etype == 0) {
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static const GEnumValue values[] = {
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{GST_TAG_DEMUX_RESULT_BROKEN_TAG, "GST_TAG_DEMUX_RESULT_BROKEN_TAG",
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"broken-tag"},
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{GST_TAG_DEMUX_RESULT_AGAIN, "GST_TAG_DEMUX_RESULT_AGAIN", "again"},
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{GST_TAG_DEMUX_RESULT_OK, "GST_TAG_DEMUX_RESULT_OK", "ok"},
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{0, NULL, NULL}
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};
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etype = g_enum_register_static ("GstTagDemuxResult", values);
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}
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return etype;
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}
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/* Cannot use boilerplate macros here because we want the abstract flag */
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GType
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gst_tag_demux_get_type (void)
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{
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static GType object_type; /* 0 */
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if (object_type == 0) {
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static const GTypeInfo object_info = {
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sizeof (GstTagDemuxClass),
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gst_tag_demux_base_init,
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NULL, /* base_finalize */
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gst_tag_demux_class_init,
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NULL, /* class_finalize */
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NULL, /* class_data */
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sizeof (GstTagDemux),
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0, /* n_preallocs */
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(GInstanceInitFunc) gst_tag_demux_init
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};
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object_type = g_type_register_static (GST_TYPE_ELEMENT,
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"GstTagDemux", &object_info, G_TYPE_FLAG_ABSTRACT);
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}
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return object_type;
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}
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static void
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gst_tag_demux_base_init (gpointer klass)
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{
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GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
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gst_element_class_add_pad_template (element_class,
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gst_static_pad_template_get (&src_factory));
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GST_DEBUG_CATEGORY_INIT (tagdemux_debug, "tagdemux", 0,
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"tag demux base class");
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}
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static void
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gst_tag_demux_class_init (gpointer klass, gpointer d)
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{
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GstTagDemuxClass *tagdemux_class = GST_TAG_DEMUX_CLASS (klass);
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GstElementClass *element_class = GST_ELEMENT_CLASS (klass);
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GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
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parent_class = g_type_class_peek_parent (klass);
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gobject_class->dispose = gst_tag_demux_dispose;
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element_class->change_state = GST_DEBUG_FUNCPTR (gst_tag_demux_change_state);
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g_type_class_add_private (klass, sizeof (GstTagDemuxPrivate));
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/* subclasses must set at least one of these */
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tagdemux_class->min_start_size = 0;
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tagdemux_class->min_end_size = 0;
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}
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static void
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gst_tag_demux_reset (GstTagDemux * tagdemux)
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{
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GstBuffer **buffer_p = &tagdemux->priv->collect;
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GstCaps **caps_p = &tagdemux->priv->src_caps;
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tagdemux->priv->strip_start = 0;
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tagdemux->priv->strip_end = 0;
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tagdemux->priv->upstream_size = -1;
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tagdemux->priv->state = GST_TAG_DEMUX_READ_START_TAG;
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tagdemux->priv->send_tag_event = FALSE;
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gst_buffer_replace (buffer_p, NULL);
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tagdemux->priv->collect_size = 0;
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gst_caps_replace (caps_p, NULL);
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gst_tag_demux_remove_srcpad (tagdemux);
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if (tagdemux->priv->event_tags) {
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gst_tag_list_free (tagdemux->priv->event_tags);
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tagdemux->priv->event_tags = NULL;
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}
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if (tagdemux->priv->parsed_tags) {
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gst_tag_list_free (tagdemux->priv->parsed_tags);
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tagdemux->priv->parsed_tags = NULL;
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}
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gst_segment_init (&tagdemux->priv->segment, GST_FORMAT_UNDEFINED);
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tagdemux->priv->need_newseg = TRUE;
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g_list_foreach (tagdemux->priv->pending_events,
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(GFunc) gst_mini_object_unref, NULL);
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g_list_free (tagdemux->priv->pending_events);
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tagdemux->priv->pending_events = NULL;
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}
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static void
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gst_tag_demux_init (GstTagDemux * demux, GstTagDemuxClass * gclass)
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{
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GstElementClass *element_klass = GST_ELEMENT_CLASS (gclass);
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GstPadTemplate *tmpl;
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demux->priv = g_type_instance_get_private ((GTypeInstance *) demux,
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GST_TYPE_TAG_DEMUX);
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tmpl = gst_element_class_get_pad_template (element_klass, "sink");
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if (tmpl) {
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demux->priv->sinkpad = gst_pad_new_from_template (tmpl, "sink");
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gst_pad_set_activate_function (demux->priv->sinkpad,
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GST_DEBUG_FUNCPTR (gst_tag_demux_sink_activate));
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gst_pad_set_event_function (demux->priv->sinkpad,
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GST_DEBUG_FUNCPTR (gst_tag_demux_sink_event));
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gst_pad_set_chain_function (demux->priv->sinkpad,
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GST_DEBUG_FUNCPTR (gst_tag_demux_chain));
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gst_element_add_pad (GST_ELEMENT (demux), demux->priv->sinkpad);
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}
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gst_tag_demux_reset (demux);
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}
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static void
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gst_tag_demux_dispose (GObject * object)
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{
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GstTagDemux *tagdemux = GST_TAG_DEMUX (object);
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gst_tag_demux_reset (tagdemux);
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G_OBJECT_CLASS (parent_class)->dispose (object);
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}
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static gboolean
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gst_tag_demux_add_srcpad (GstTagDemux * tagdemux, GstCaps * new_caps)
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{
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if (tagdemux->priv->src_caps == NULL ||
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!gst_caps_is_equal (new_caps, tagdemux->priv->src_caps)) {
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gst_caps_replace (&tagdemux->priv->src_caps, new_caps);
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if (tagdemux->priv->srcpad != NULL) {
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GST_DEBUG_OBJECT (tagdemux, "Changing src pad caps to %" GST_PTR_FORMAT,
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tagdemux->priv->src_caps);
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gst_pad_set_caps (tagdemux->priv->srcpad, tagdemux->priv->src_caps);
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}
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} else {
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/* Caps never changed */
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}
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if (tagdemux->priv->srcpad == NULL) {
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tagdemux->priv->srcpad =
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gst_pad_new_from_template (gst_element_class_get_pad_template
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(GST_ELEMENT_GET_CLASS (tagdemux), "src"), "src");
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g_return_val_if_fail (tagdemux->priv->srcpad != NULL, FALSE);
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gst_pad_set_query_type_function (tagdemux->priv->srcpad,
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GST_DEBUG_FUNCPTR (gst_tag_demux_get_query_types));
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gst_pad_set_query_function (tagdemux->priv->srcpad,
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GST_DEBUG_FUNCPTR (gst_tag_demux_pad_query));
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gst_pad_set_event_function (tagdemux->priv->srcpad,
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GST_DEBUG_FUNCPTR (gst_tag_demux_srcpad_event));
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gst_pad_set_activatepull_function (tagdemux->priv->srcpad,
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GST_DEBUG_FUNCPTR (gst_tag_demux_src_activate_pull));
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gst_pad_set_getrange_function (tagdemux->priv->srcpad,
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GST_DEBUG_FUNCPTR (gst_tag_demux_src_getrange));
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gst_pad_use_fixed_caps (tagdemux->priv->srcpad);
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if (tagdemux->priv->src_caps)
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gst_pad_set_caps (tagdemux->priv->srcpad, tagdemux->priv->src_caps);
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GST_DEBUG_OBJECT (tagdemux, "Adding src pad with caps %" GST_PTR_FORMAT,
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tagdemux->priv->src_caps);
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gst_object_ref (tagdemux->priv->srcpad);
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gst_pad_set_active (tagdemux->priv->srcpad, TRUE);
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if (!gst_element_add_pad (GST_ELEMENT (tagdemux), tagdemux->priv->srcpad))
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return FALSE;
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gst_element_no_more_pads (GST_ELEMENT (tagdemux));
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}
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return TRUE;
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}
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static gboolean
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gst_tag_demux_remove_srcpad (GstTagDemux * demux)
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{
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gboolean res = TRUE;
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if (demux->priv->srcpad != NULL) {
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GST_DEBUG_OBJECT (demux, "Removing src pad");
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res = gst_element_remove_pad (GST_ELEMENT (demux), demux->priv->srcpad);
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g_return_val_if_fail (res != FALSE, FALSE);
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gst_object_unref (demux->priv->srcpad);
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demux->priv->srcpad = NULL;
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}
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return res;
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};
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/* will return FALSE if buffer is beyond end of data; will return TRUE
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* if buffer was trimmed successfully or didn't need trimming, but may
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* also return TRUE and set *buf_ref to NULL if the buffer was before
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* the start of the data */
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static gboolean
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gst_tag_demux_trim_buffer (GstTagDemux * tagdemux, GstBuffer ** buf_ref,
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gsize * buf_size)
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{
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GstBuffer *buf = *buf_ref;
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guint trim_start = 0;
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guint out_size, bsize;
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guint64 out_offset, boffset;
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gboolean need_sub = FALSE;
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bsize = out_size = gst_buffer_get_size (buf);
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boffset = out_offset = GST_BUFFER_OFFSET (buf);
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/* Adjust offset and length */
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if (!GST_BUFFER_OFFSET_IS_VALID (buf)) {
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/* Can't change anything without an offset */
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*buf_size = bsize;
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return TRUE;
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}
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/* If the buffer crosses the tag at the end of file, trim it */
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if (tagdemux->priv->strip_end > 0) {
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if (gst_tag_demux_get_upstream_size (tagdemux)) {
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guint64 v1tag_offset =
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tagdemux->priv->upstream_size - tagdemux->priv->strip_end;
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if (out_offset >= v1tag_offset) {
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GST_DEBUG_OBJECT (tagdemux, "Buffer is past the end of the data");
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goto no_out_buffer_end;
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}
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if (out_offset + out_size > v1tag_offset) {
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out_size = v1tag_offset - out_offset;
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need_sub = TRUE;
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}
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}
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}
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if (tagdemux->priv->strip_start > 0) {
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/* If the buffer crosses the tag at the start of file, trim it */
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if (out_offset <= tagdemux->priv->strip_start) {
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if (out_offset + out_size <= tagdemux->priv->strip_start) {
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GST_DEBUG_OBJECT (tagdemux, "Buffer is before the start of the data");
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goto no_out_buffer_start;
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}
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trim_start = tagdemux->priv->strip_start - out_offset;
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out_size -= trim_start;
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out_offset = 0;
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} else {
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out_offset -= tagdemux->priv->strip_start;
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}
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need_sub = TRUE;
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}
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if (need_sub == TRUE) {
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if (out_size != bsize || !gst_buffer_is_writable (buf)) {
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GstBuffer *sub;
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GST_DEBUG_OBJECT (tagdemux, "Sub-buffering to trim size %d offset %"
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G_GINT64_FORMAT " to %d offset %" G_GINT64_FORMAT,
|
|
bsize, boffset, out_size, out_offset);
|
|
|
|
sub =
|
|
gst_buffer_copy_region (buf, GST_BUFFER_COPY_ALL, trim_start,
|
|
out_size);
|
|
g_return_val_if_fail (sub != NULL, FALSE);
|
|
gst_buffer_unref (buf);
|
|
*buf_ref = buf = sub;
|
|
*buf_size = out_size;
|
|
} else {
|
|
GST_DEBUG_OBJECT (tagdemux, "Adjusting buffer from size %d offset %"
|
|
G_GINT64_FORMAT " to %d offset %" G_GINT64_FORMAT,
|
|
bsize, boffset, out_size, out_offset);
|
|
}
|
|
|
|
GST_BUFFER_OFFSET (buf) = out_offset;
|
|
GST_BUFFER_OFFSET_END (buf) = out_offset + out_size;
|
|
}
|
|
|
|
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_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_get_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_get_size (collect);
|
|
gst_buffer_set_size (collect, tagsize);
|
|
newsize = tagsize;
|
|
|
|
parse_ret = klass->parse_tag (demux, collect, TRUE, &newsize, &tags);
|
|
|
|
gst_buffer_set_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;
|
|
gsize size;
|
|
|
|
demux = GST_TAG_DEMUX (GST_PAD_PARENT (pad));
|
|
|
|
size = gst_buffer_get_size (buf);
|
|
|
|
/* Update our segment position info */
|
|
if (demux->priv->segment.format == GST_FORMAT_BYTES) {
|
|
if (GST_BUFFER_OFFSET_IS_VALID (buf))
|
|
demux->priv->segment.position = GST_BUFFER_OFFSET (buf);
|
|
demux->priv->segment.position += size;
|
|
} else if (demux->priv->segment.format == GST_FORMAT_TIME) {
|
|
if (GST_BUFFER_TIMESTAMP_IS_VALID (buf))
|
|
demux->priv->segment.position = GST_BUFFER_TIMESTAMP (buf);
|
|
if (GST_BUFFER_DURATION_IS_VALID (buf))
|
|
demux->priv->segment.position += GST_BUFFER_DURATION (buf);
|
|
}
|
|
|
|
if (demux->priv->collect == NULL) {
|
|
demux->priv->collect = buf;
|
|
} else {
|
|
demux->priv->collect = gst_buffer_join (demux->priv->collect, buf);
|
|
}
|
|
demux->priv->collect_size += size;
|
|
buf = NULL;
|
|
|
|
switch (demux->priv->state) {
|
|
case GST_TAG_DEMUX_READ_START_TAG:
|
|
demux->priv->collect = gst_buffer_make_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;
|
|
gsize typefind_size;
|
|
GstCaps *caps;
|
|
|
|
if (demux->priv->collect_size <
|
|
TYPE_FIND_MIN_SIZE + demux->priv->strip_start)
|
|
break; /* Go get more data first */
|
|
|
|
GST_DEBUG_OBJECT (demux, "Typefinding with size %d",
|
|
demux->priv->collect_size);
|
|
|
|
/* 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, &typefind_size))
|
|
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 (typefind_size < 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;
|
|
demux->priv->collect_size = 0;
|
|
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;
|
|
gsize outbuf_size;
|
|
|
|
/* Trim the buffer and adjust offset */
|
|
if (demux->priv->collect) {
|
|
outbuf = demux->priv->collect;
|
|
demux->priv->collect = NULL;
|
|
demux->priv->collect_size = 0;
|
|
if (!gst_tag_demux_trim_buffer (demux, &outbuf, &outbuf_size))
|
|
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 any pending events we cached */
|
|
gst_tag_demux_send_pending_events (demux);
|
|
|
|
/* Send our own pending tag event */
|
|
if (demux->priv->send_tag_event) {
|
|
gst_tag_demux_send_tag_event (demux);
|
|
demux->priv->send_tag_event = FALSE;
|
|
}
|
|
|
|
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_SEGMENT:
|
|
{
|
|
gst_event_copy_segment (event, &demux->priv->segment);
|
|
|
|
demux->priv->need_newseg = TRUE;
|
|
gst_event_unref (event);
|
|
ret = TRUE;
|
|
break;
|
|
}
|
|
case GST_EVENT_FLUSH_STOP:
|
|
case GST_EVENT_FLUSH_START:
|
|
ret = gst_pad_event_default (pad, event);
|
|
break;
|
|
default:
|
|
if (demux->priv->need_newseg && GST_EVENT_IS_SERIALIZED (event)) {
|
|
/* Cache all events if we have a pending segment, so they don't get
|
|
* lost (esp. tag events) */
|
|
GST_INFO_OBJECT (demux, "caching event: %" GST_PTR_FORMAT, event);
|
|
GST_OBJECT_LOCK (demux);
|
|
demux->priv->pending_events =
|
|
g_list_append (demux->priv->pending_events, event);
|
|
GST_OBJECT_UNLOCK (demux);
|
|
ret = TRUE;
|
|
} else {
|
|
ret = gst_pad_event_default (pad, event);
|
|
}
|
|
break;
|
|
}
|
|
|
|
gst_object_unref (demux);
|
|
return ret;
|
|
}
|
|
|
|
static gboolean
|
|
gst_tag_demux_get_upstream_size (GstTagDemux * tagdemux)
|
|
{
|
|
gint64 len;
|
|
|
|
/* Short-cut if we already queried upstream */
|
|
if (tagdemux->priv->upstream_size > 0)
|
|
return TRUE;
|
|
|
|
if (!gst_pad_query_peer_duration (tagdemux->priv->sinkpad, GST_FORMAT_BYTES,
|
|
&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:
|
|
res = gst_pad_push_event (tagdemux->priv->sinkpad, event);
|
|
event = NULL;
|
|
break;
|
|
}
|
|
|
|
gst_object_unref (tagdemux);
|
|
if (event)
|
|
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;
|
|
gsize bsize;
|
|
|
|
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;
|
|
}
|
|
|
|
bsize = gst_buffer_get_size (buffer);
|
|
|
|
if (bsize < klass->min_end_size) {
|
|
GST_DEBUG_OBJECT (demux, "Only managed to read %u bytes from file "
|
|
"(required: %u bytes)", bsize, 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 (bsize != 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;
|
|
}
|
|
|
|
bsize = gst_buffer_get_size (buffer);
|
|
|
|
if (bsize < tagsize) {
|
|
GST_DEBUG_OBJECT (demux, "Only managed to read %u bytes from file",
|
|
bsize);
|
|
goto done;
|
|
}
|
|
}
|
|
|
|
GST_BUFFER_OFFSET (buffer) = offset;
|
|
|
|
saved_size = bsize;
|
|
gst_buffer_set_size (buffer, tagsize);
|
|
newsize = tagsize;
|
|
|
|
parse_ret = klass->parse_tag (demux, buffer, FALSE, &newsize, &new_tags);
|
|
|
|
gst_buffer_set_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;
|
|
gsize bsize;
|
|
|
|
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;
|
|
}
|
|
|
|
bsize = gst_buffer_get_size (buffer);
|
|
|
|
if (bsize < klass->min_start_size) {
|
|
GST_DEBUG_OBJECT (demux, "Only managed to read %u bytes from file - "
|
|
"no tag in this file", bsize);
|
|
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 (bsize < 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;
|
|
}
|
|
|
|
bsize = gst_buffer_get_size (buffer);
|
|
|
|
if (bsize < tagsize) {
|
|
GST_DEBUG_OBJECT (demux, "Only managed to read %u bytes from file",
|
|
bsize);
|
|
GST_ELEMENT_ERROR (demux, STREAM, DECODE,
|
|
(_("Failed to read tag: not enough data")), (NULL));
|
|
goto done;
|
|
}
|
|
}
|
|
|
|
saved_size = bsize;
|
|
gst_buffer_set_size (buffer, tagsize);
|
|
newsize = tagsize;
|
|
parse_ret = klass->parse_tag (demux, buffer, TRUE, &newsize, &new_tags);
|
|
|
|
gst_buffer_set_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;
|
|
GstQuery *query;
|
|
gboolean pull_mode;
|
|
|
|
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.
|
|
*/
|
|
query = gst_query_new_scheduling ();
|
|
|
|
if (!gst_pad_peer_query (sinkpad, query)) {
|
|
gst_query_unref (query);
|
|
goto activate_push;
|
|
}
|
|
|
|
gst_query_parse_scheduling (query, &pull_mode, NULL, NULL, NULL, NULL, NULL);
|
|
gst_query_unref (query);
|
|
|
|
if (!pull_mode)
|
|
goto activate_push;
|
|
|
|
if (!gst_pad_activate_pull (sinkpad, TRUE))
|
|
goto activate_push;
|
|
|
|
/* 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;
|
|
}
|
|
|
|
if (demux->priv->upstream_size <=
|
|
demux->priv->strip_start + demux->priv->strip_end) {
|
|
/* There was no data (probably due to a truncated file) */
|
|
GST_DEBUG_OBJECT (demux, "No data in file");
|
|
/* so we don't know about type either */
|
|
GST_ELEMENT_ERROR (demux, STREAM, TYPE_NOT_FOUND, (NULL), (NULL));
|
|
goto done_activate;
|
|
}
|
|
|
|
/* 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;
|
|
|
|
activate_push:
|
|
{
|
|
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);
|
|
}
|
|
}
|
|
|
|
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 GstFlowReturn
|
|
gst_tag_demux_read_range (GstTagDemux * demux,
|
|
guint64 offset, guint length, GstBuffer ** buffer)
|
|
{
|
|
GstFlowReturn ret;
|
|
guint64 in_offset;
|
|
guint in_length;
|
|
gsize size;
|
|
|
|
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, &size))
|
|
goto read_beyond_end;
|
|
|
|
/* this should only happen in streaming mode */
|
|
g_assert (*buffer != NULL);
|
|
}
|
|
|
|
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));
|
|
|
|
/* downstream in pull mode won't miss a newsegment event,
|
|
* but it likely appreciates other (tag) events */
|
|
if (demux->priv->need_newseg) {
|
|
gst_tag_demux_send_pending_events (demux);
|
|
demux->priv->need_newseg = FALSE;
|
|
}
|
|
|
|
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_pending_events (GstTagDemux * demux)
|
|
{
|
|
GList *events;
|
|
|
|
/* send any pending events we cached */
|
|
GST_OBJECT_LOCK (demux);
|
|
events = demux->priv->pending_events;
|
|
demux->priv->pending_events = NULL;
|
|
GST_OBJECT_UNLOCK (demux);
|
|
|
|
while (events != NULL) {
|
|
GST_DEBUG_OBJECT (demux->priv->srcpad, "sending cached %s event: %"
|
|
GST_PTR_FORMAT, GST_EVENT_TYPE_NAME (events->data), events->data);
|
|
gst_pad_push_event (demux->priv->srcpad, GST_EVENT (events->data));
|
|
events = g_list_delete_link (events, events);
|
|
}
|
|
}
|
|
|
|
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;
|
|
GstSegment newseg;
|
|
|
|
if (seg->format == GST_FORMAT_UNDEFINED) {
|
|
GST_LOG_OBJECT (tagdemux,
|
|
"No new segment received before first buffer. Using default");
|
|
gst_segment_init (seg, GST_FORMAT_BYTES);
|
|
seg->start = tagdemux->priv->strip_start;
|
|
seg->time = tagdemux->priv->strip_start;
|
|
}
|
|
|
|
/* Can't adjust segments in non-BYTES formats */
|
|
if (tagdemux->priv->segment.format != GST_FORMAT_BYTES) {
|
|
event = gst_event_new_segment (seg);
|
|
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 segment %" GST_SEGMENT_FORMAT, seg);
|
|
|
|
gst_segment_copy_into (seg, &newseg);
|
|
newseg.start = start;
|
|
newseg.stop = stop;
|
|
newseg.position = position;
|
|
event = gst_event_new_segment (&newseg);
|
|
|
|
return gst_pad_push_event (tagdemux->priv->srcpad, event);
|
|
}
|