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626 lines
18 KiB
C
626 lines
18 KiB
C
/* GStreamer
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* Copyright (C) <2004> Thomas Vander Stichele <thomas at apestaart dot org>
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* Copyright (C) 2006 Andy Wingo <wingo@pobox.com>
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* Copyright (C) 2008 Vincent Penquerc'h <ogg.k.ogg.k@googlemail.com>
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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:element-kateparse
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* @short_description: parses kate streams
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* @see_also: katedec, vorbisparse, oggdemux, theoraparse
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*
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* <refsect2>
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* <para>
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* The kateparse element will parse the header packets of the Kate
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* stream and put them as the streamheader in the caps. This is used in the
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* multifdsink case where you want to stream live kate streams to multiple
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* clients, each client has to receive the streamheaders first before they can
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* consume the kate packets.
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* </para>
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* <para>
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* This element also makes sure that the buffers that it pushes out are properly
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* timestamped and that their offset and offset_end are set. The buffers that
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* kateparse outputs have all of the metadata that oggmux expects to receive,
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* which allows you to (for example) remux an ogg/kate file.
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* </para>
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* <title>Example pipelines</title>
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* <para>
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* <programlisting>
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* gst-launch -v filesrc location=kate.ogg ! oggdemux ! kateparse ! fakesink
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* </programlisting>
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* This pipeline shows that the streamheader is set in the caps, and that each
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* buffer has the timestamp, duration, offset, and offset_end set.
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* </para>
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* <para>
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* <programlisting>
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* gst-launch filesrc location=kate.ogg ! oggdemux ! kateparse \
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* ! oggmux ! filesink location=kate-remuxed.ogg
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* </programlisting>
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* This pipeline shows remuxing. kate-remuxed.ogg might not be exactly the same
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* as kate.ogg, but they should produce exactly the same decoded data.
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* </para>
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* </refsect2>
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*
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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 "gstkate.h"
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#include "gstkateutil.h"
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#include "gstkateparse.h"
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GST_DEBUG_CATEGORY_EXTERN (gst_kateparse_debug);
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#define GST_CAT_DEFAULT gst_kateparse_debug
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static GstStaticPadTemplate gst_kate_parse_sink_factory =
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GST_STATIC_PAD_TEMPLATE ("sink",
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GST_PAD_SINK,
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GST_PAD_ALWAYS,
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GST_STATIC_CAPS ("subtitle/x-kate; application/x-kate")
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);
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static GstStaticPadTemplate gst_kate_parse_src_factory =
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GST_STATIC_PAD_TEMPLATE ("src",
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GST_PAD_SRC,
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GST_PAD_ALWAYS,
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GST_STATIC_CAPS ("subtitle/x-kate; application/x-kate")
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);
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#define gst_kate_parse_parent_class parent_class
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G_DEFINE_TYPE (GstKateParse, gst_kate_parse, GST_TYPE_ELEMENT);
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static GstFlowReturn gst_kate_parse_chain (GstPad * pad, GstBuffer * buffer);
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static GstStateChangeReturn gst_kate_parse_change_state (GstElement * element,
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GstStateChange transition);
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static gboolean gst_kate_parse_sink_event (GstPad * pad, GstEvent * event);
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static gboolean gst_kate_parse_src_query (GstPad * pad, GstQuery * query);
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#if 0
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static gboolean gst_kate_parse_convert (GstPad * pad,
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GstFormat src_format, gint64 src_value,
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GstFormat * dest_format, gint64 * dest_value);
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#endif
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static GstFlowReturn gst_kate_parse_parse_packet (GstKateParse * parse,
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GstBuffer * buf);
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static void
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gst_kate_parse_class_init (GstKateParseClass * klass)
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{
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GstElementClass *gstelement_class = GST_ELEMENT_CLASS (klass);
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gstelement_class->change_state = gst_kate_parse_change_state;
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gst_element_class_add_pad_template (gstelement_class,
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gst_static_pad_template_get (&gst_kate_parse_src_factory));
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gst_element_class_add_pad_template (gstelement_class,
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gst_static_pad_template_get (&gst_kate_parse_sink_factory));
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gst_element_class_set_details_simple (gstelement_class, "Kate stream parser",
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"Codec/Parser/Subtitle",
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"parse raw kate streams",
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"Vincent Penquerc'h <ogg.k.ogg.k at googlemail dot com>");
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klass->parse_packet = GST_DEBUG_FUNCPTR (gst_kate_parse_parse_packet);
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}
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static void
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gst_kate_parse_init (GstKateParse * parse)
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{
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parse->sinkpad =
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gst_pad_new_from_static_template (&gst_kate_parse_sink_factory, "sink");
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gst_pad_set_chain_function (parse->sinkpad,
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GST_DEBUG_FUNCPTR (gst_kate_parse_chain));
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gst_pad_set_event_function (parse->sinkpad,
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GST_DEBUG_FUNCPTR (gst_kate_parse_sink_event));
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gst_element_add_pad (GST_ELEMENT (parse), parse->sinkpad);
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parse->srcpad =
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gst_pad_new_from_static_template (&gst_kate_parse_src_factory, "src");
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gst_pad_set_query_function (parse->srcpad,
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GST_DEBUG_FUNCPTR (gst_kate_parse_src_query));
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gst_element_add_pad (GST_ELEMENT (parse), parse->srcpad);
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}
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static void
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gst_kate_parse_drain_event_queue (GstKateParse * parse)
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{
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while (parse->event_queue->length) {
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GstEvent *event;
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event = GST_EVENT_CAST (g_queue_pop_head (parse->event_queue));
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gst_pad_event_default (parse->sinkpad, event);
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}
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}
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static GstFlowReturn
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gst_kate_parse_push_headers (GstKateParse * parse)
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{
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/* mark and put on caps */
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GstCaps *caps;
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GstBuffer *outbuf;
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kate_packet packet;
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GList *headers, *outbuf_list = NULL;
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int ret;
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gboolean res;
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/* get the headers into the caps, passing them to kate as we go */
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caps =
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gst_kate_util_set_header_on_caps (&parse->element,
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gst_pad_get_current_caps (parse->sinkpad), parse->streamheader);
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if (G_UNLIKELY (!caps)) {
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GST_ELEMENT_ERROR (parse, STREAM, DECODE, (NULL),
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("Failed to set headers on caps"));
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return GST_FLOW_ERROR;
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}
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GST_DEBUG_OBJECT (parse, "here are the caps: %" GST_PTR_FORMAT, caps);
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res = gst_pad_set_caps (parse->srcpad, caps);
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gst_caps_unref (caps);
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if (G_UNLIKELY (!res)) {
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GST_WARNING_OBJECT (parse->srcpad, "Failed to set caps on source pad");
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return GST_FLOW_NOT_NEGOTIATED;
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}
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headers = parse->streamheader;
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while (headers) {
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guint8 *data;
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gsize size;
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outbuf = GST_BUFFER_CAST (headers->data);
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data = gst_buffer_map (outbuf, &size, NULL, GST_MAP_READ);
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kate_packet_wrap (&packet, size, data);
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ret = kate_decode_headerin (&parse->ki, &parse->kc, &packet);
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if (G_UNLIKELY (ret < 0)) {
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GST_WARNING_OBJECT (parse, "kate_decode_headerin returned %d", ret);
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}
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gst_buffer_unmap (outbuf, data, size);
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/* takes ownership of outbuf, which was previously in parse->streamheader */
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outbuf_list = g_list_append (outbuf_list, outbuf);
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headers = headers->next;
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}
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/* first process queued events */
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gst_kate_parse_drain_event_queue (parse);
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/* push out buffers, ignoring return value... */
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headers = outbuf_list;
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while (headers) {
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outbuf = GST_BUFFER_CAST (headers->data);
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gst_pad_push (parse->srcpad, outbuf);
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headers = headers->next;
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}
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g_list_free (outbuf_list);
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g_list_free (parse->streamheader);
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parse->streamheader = NULL;
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parse->streamheader_sent = TRUE;
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return GST_FLOW_OK;
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}
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static void
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gst_kate_parse_clear_queue (GstKateParse * parse)
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{
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GST_DEBUG_OBJECT (parse, "Clearing queue");
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while (parse->buffer_queue->length) {
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GstBuffer *buf;
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buf = GST_BUFFER_CAST (g_queue_pop_head (parse->buffer_queue));
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gst_buffer_unref (buf);
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}
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while (parse->event_queue->length) {
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GstEvent *event;
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event = GST_EVENT_CAST (g_queue_pop_head (parse->event_queue));
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gst_event_unref (event);
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}
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}
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static GstFlowReturn
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gst_kate_parse_push_buffer (GstKateParse * parse, GstBuffer * buf,
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gint64 granulepos)
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{
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GST_LOG_OBJECT (parse, "granulepos %16" G_GINT64_MODIFIER "x", granulepos);
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if (granulepos < 0) {
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/* packets coming not from Ogg won't have a granpos in the offset end,
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so we have to synthesize one here - only problem is we don't know
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the backlink - pretend there's none for now */
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GST_INFO_OBJECT (parse, "No granulepos on buffer, synthesizing one");
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granulepos =
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kate_duration_granule (&parse->ki,
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GST_BUFFER_TIMESTAMP (buf) /
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(double) GST_SECOND) << kate_granule_shift (&parse->ki);
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}
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GST_BUFFER_OFFSET (buf) =
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kate_granule_time (&parse->ki, granulepos) * GST_SECOND;
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GST_BUFFER_OFFSET_END (buf) = granulepos;
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GST_BUFFER_TIMESTAMP (buf) = GST_BUFFER_OFFSET (buf);
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return gst_pad_push (parse->srcpad, buf);
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}
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static GstFlowReturn
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gst_kate_parse_drain_queue_prematurely (GstKateParse * parse)
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{
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GstFlowReturn ret = GST_FLOW_OK;
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/* got an EOS event, make sure to push out any buffers that were in the queue
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* -- won't normally be the case, but this catches the
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* didn't-get-a-granulepos-on-the-last-packet case. Assuming a continuous
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* stream. */
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/* if we got EOS before any buffers came, go ahead and push the other events
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* first */
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gst_kate_parse_drain_event_queue (parse);
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while (!g_queue_is_empty (parse->buffer_queue)) {
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GstBuffer *buf;
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gint64 granpos;
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buf = GST_BUFFER_CAST (g_queue_pop_head (parse->buffer_queue));
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granpos = GST_BUFFER_OFFSET_END (buf);
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ret = gst_kate_parse_push_buffer (parse, buf, granpos);
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if (ret != GST_FLOW_OK)
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goto done;
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}
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g_assert (g_queue_is_empty (parse->buffer_queue));
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done:
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return ret;
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}
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static GstFlowReturn
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gst_kate_parse_drain_queue (GstKateParse * parse, gint64 granulepos)
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{
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GstFlowReturn ret = GST_FLOW_OK;
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if (!g_queue_is_empty (parse->buffer_queue)) {
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GstBuffer *buf;
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buf = GST_BUFFER_CAST (g_queue_pop_head (parse->buffer_queue));
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ret = gst_kate_parse_push_buffer (parse, buf, granulepos);
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if (ret != GST_FLOW_OK)
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goto done;
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}
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g_assert (g_queue_is_empty (parse->buffer_queue));
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done:
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return ret;
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}
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static GstFlowReturn
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gst_kate_parse_queue_buffer (GstKateParse * parse, GstBuffer * buf)
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{
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GstFlowReturn ret = GST_FLOW_OK;
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gint64 granpos;
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buf = gst_buffer_make_writable (buf);
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/* oggdemux stores the granule pos in the offset end */
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granpos = GST_BUFFER_OFFSET_END (buf);
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GST_LOG_OBJECT (parse, "granpos %16" G_GINT64_MODIFIER "x", granpos);
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g_queue_push_tail (parse->buffer_queue, buf);
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#if 1
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/* if getting buffers from matroska, we won't have a granpos here... */
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//if (GST_BUFFER_OFFSET_END_IS_VALID (buf)) {
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ret = gst_kate_parse_drain_queue (parse, granpos);
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//}
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#else
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if (granpos >= 0) {
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ret = gst_kate_parse_drain_queue (parse, granpos);
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} else {
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GST_ELEMENT_ERROR (parse, STREAM, DECODE, (NULL),
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("Bad granulepos %" G_GINT64_FORMAT, granpos));
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ret = GST_FLOW_ERROR;
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}
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#endif
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return ret;
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}
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static GstFlowReturn
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gst_kate_parse_parse_packet (GstKateParse * parse, GstBuffer * buf)
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{
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GstFlowReturn ret = GST_FLOW_OK;
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guint8 header[1];
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gsize size;
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g_assert (parse);
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parse->packetno++;
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size = gst_buffer_extract (buf, 0, header, 1);
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GST_LOG_OBJECT (parse, "Got packet %02x, %u bytes",
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size ? header[0] : -1, gst_buffer_get_size (buf));
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if (size > 0 && header[0] & 0x80) {
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GST_DEBUG_OBJECT (parse, "Found header %02x", header[0]);
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/* if 0x80 is set, it's streamheader,
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* so put it on the streamheader list and return */
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parse->streamheader = g_list_append (parse->streamheader, buf);
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ret = GST_FLOW_OK;
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} else {
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if (!parse->streamheader_sent) {
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GST_DEBUG_OBJECT (parse, "Found non header, pushing headers seen so far");
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ret = gst_kate_parse_push_headers (parse);
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}
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if (ret == GST_FLOW_OK) {
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ret = gst_kate_parse_queue_buffer (parse, buf);
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}
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}
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return ret;
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}
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static GstFlowReturn
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gst_kate_parse_chain (GstPad * pad, GstBuffer * buffer)
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{
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GstKateParseClass *klass;
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GstKateParse *parse;
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parse = GST_KATE_PARSE (GST_PAD_PARENT (pad));
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klass = GST_KATE_PARSE_CLASS (G_OBJECT_GET_CLASS (parse));
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g_assert (klass->parse_packet != NULL);
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if (G_UNLIKELY (!gst_pad_has_current_caps (pad)))
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return GST_FLOW_NOT_NEGOTIATED;
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return klass->parse_packet (parse, buffer);
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}
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static gboolean
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gst_kate_parse_queue_event (GstKateParse * parse, GstEvent * event)
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{
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GstFlowReturn ret = TRUE;
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g_queue_push_tail (parse->event_queue, event);
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return ret;
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}
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static gboolean
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gst_kate_parse_sink_event (GstPad * pad, GstEvent * event)
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{
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gboolean ret;
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GstKateParse *parse;
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parse = GST_KATE_PARSE (gst_pad_get_parent (pad));
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switch (GST_EVENT_TYPE (event)) {
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case GST_EVENT_FLUSH_START:
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gst_kate_parse_clear_queue (parse);
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ret = gst_pad_event_default (pad, event);
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break;
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case GST_EVENT_EOS:
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if (!parse->streamheader_sent) {
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GST_DEBUG_OBJECT (parse, "Got EOS, pushing headers seen so far");
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ret = gst_kate_parse_push_headers (parse);
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if (ret != GST_FLOW_OK)
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goto done;
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}
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gst_kate_parse_drain_queue_prematurely (parse);
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ret = gst_pad_event_default (pad, event);
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break;
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default:
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if (!parse->streamheader_sent && GST_EVENT_IS_SERIALIZED (event))
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ret = gst_kate_parse_queue_event (parse, event);
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else
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ret = gst_pad_event_default (pad, event);
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break;
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}
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done:
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gst_object_unref (parse);
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return ret;
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}
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#if 0
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static gboolean
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gst_kate_parse_convert (GstPad * pad,
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GstFormat src_format, gint64 src_value,
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GstFormat * dest_format, gint64 * dest_value)
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{
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gboolean res = TRUE;
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GstKateParse *parse;
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parse = GST_KATE_PARSE (GST_PAD_PARENT (pad));
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/* fixme: assumes atomic access to lots of instance variables modified from
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* the streaming thread, including 64-bit variables */
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if (!parse->streamheader_sent)
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return FALSE;
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if (src_format == *dest_format) {
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*dest_value = src_value;
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return TRUE;
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}
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if (parse->sinkpad == pad &&
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(src_format == GST_FORMAT_BYTES || *dest_format == GST_FORMAT_BYTES))
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return FALSE;
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switch (src_format) {
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case GST_FORMAT_TIME:
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switch (*dest_format) {
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default:
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res = FALSE;
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}
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break;
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case GST_FORMAT_DEFAULT:
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switch (*dest_format) {
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case GST_FORMAT_TIME:
|
|
*dest_value = kate_granule_time (&parse->ki, src_value) * GST_SECOND;
|
|
break;
|
|
default:
|
|
res = FALSE;
|
|
}
|
|
break;
|
|
default:
|
|
res = FALSE;
|
|
}
|
|
|
|
return res;
|
|
}
|
|
#endif
|
|
|
|
static gboolean
|
|
gst_kate_parse_src_query (GstPad * pad, GstQuery * query)
|
|
{
|
|
#if 1
|
|
// TODO
|
|
GST_WARNING ("gst_kate_parse_src_query");
|
|
return FALSE;
|
|
#else
|
|
gint64 granulepos;
|
|
GstKateParse *parse;
|
|
gboolean res = FALSE;
|
|
|
|
parse = GST_KATE_PARSE (GST_PAD_PARENT (pad));
|
|
|
|
switch (GST_QUERY_TYPE (query)) {
|
|
case GST_QUERY_POSITION:
|
|
{
|
|
GstFormat format;
|
|
gint64 value;
|
|
|
|
granulepos = parse->prev_granulepos;
|
|
|
|
gst_query_parse_position (query, &format, NULL);
|
|
|
|
/* and convert to the final format */
|
|
if (!(res =
|
|
gst_kate_parse_convert (pad, GST_FORMAT_DEFAULT, granulepos,
|
|
&format, &value)))
|
|
goto error;
|
|
|
|
/* fixme: support segments
|
|
value = (value - parse->segment_start) + parse->segment_time;
|
|
*/
|
|
|
|
gst_query_set_position (query, format, value);
|
|
|
|
GST_LOG_OBJECT (parse, "query %p: peer returned granulepos: %"
|
|
G_GUINT64_FORMAT " - we return %" G_GUINT64_FORMAT " (format %u)",
|
|
query, granulepos, value, format);
|
|
|
|
break;
|
|
}
|
|
case GST_QUERY_DURATION:
|
|
{
|
|
/* fixme: not threadsafe */
|
|
/* query peer for total length */
|
|
if (!gst_pad_is_linked (parse->sinkpad)) {
|
|
GST_WARNING_OBJECT (parse, "sink pad %" GST_PTR_FORMAT " is not linked",
|
|
parse->sinkpad);
|
|
goto error;
|
|
}
|
|
if (!(res = gst_pad_query (GST_PAD_PEER (parse->sinkpad), query)))
|
|
goto error;
|
|
break;
|
|
}
|
|
case GST_QUERY_CONVERT:
|
|
{
|
|
GstFormat src_fmt, dest_fmt;
|
|
gint64 src_val, dest_val;
|
|
|
|
gst_query_parse_convert (query, &src_fmt, &src_val, &dest_fmt, &dest_val);
|
|
if (!(res =
|
|
gst_kate_parse_convert (pad, src_fmt, src_val, &dest_fmt,
|
|
&dest_val)))
|
|
goto error;
|
|
gst_query_set_convert (query, src_fmt, src_val, dest_fmt, dest_val);
|
|
break;
|
|
}
|
|
default:
|
|
res = gst_pad_query_default (pad, query);
|
|
break;
|
|
}
|
|
return res;
|
|
|
|
error:
|
|
{
|
|
GST_WARNING_OBJECT (parse, "error handling query");
|
|
return res;
|
|
}
|
|
#endif
|
|
}
|
|
|
|
static void
|
|
gst_kate_parse_free_stream_headers (GstKateParse * parse)
|
|
{
|
|
while (parse->streamheader != NULL) {
|
|
gst_buffer_unref (GST_BUFFER (parse->streamheader->data));
|
|
parse->streamheader = g_list_delete_link (parse->streamheader,
|
|
parse->streamheader);
|
|
}
|
|
}
|
|
|
|
static GstStateChangeReturn
|
|
gst_kate_parse_change_state (GstElement * element, GstStateChange transition)
|
|
{
|
|
GstKateParse *parse = GST_KATE_PARSE (element);
|
|
GstStateChangeReturn ret;
|
|
|
|
switch (transition) {
|
|
case GST_STATE_CHANGE_READY_TO_PAUSED:
|
|
kate_info_init (&parse->ki);
|
|
kate_comment_init (&parse->kc);
|
|
parse->packetno = 0;
|
|
parse->streamheader_sent = FALSE;
|
|
parse->streamheader = NULL;
|
|
parse->buffer_queue = g_queue_new ();
|
|
parse->event_queue = g_queue_new ();
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
|
|
|
|
switch (transition) {
|
|
case GST_STATE_CHANGE_PAUSED_TO_READY:
|
|
kate_info_clear (&parse->ki);
|
|
kate_comment_clear (&parse->kc);
|
|
|
|
gst_kate_parse_clear_queue (parse);
|
|
g_queue_free (parse->buffer_queue);
|
|
parse->buffer_queue = NULL;
|
|
g_queue_free (parse->event_queue);
|
|
parse->event_queue = NULL;
|
|
gst_kate_parse_free_stream_headers (parse);
|
|
break;
|
|
|
|
default:
|
|
break;
|
|
}
|
|
|
|
return ret;
|
|
}
|