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https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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1813 lines
53 KiB
C
1813 lines
53 KiB
C
/* GStreamer
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* Copyright (C) 2008 Nokia Corporation. All rights reserved.
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* Contact: Stefan Kost <stefan.kost@nokia.com>
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* Copyright (C) 2008 Sebastian Dröge <sebastian.droege@collabora.co.uk>.
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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:gstbaseparse
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* @short_description: Base class for stream parsers
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* @see_also: #GstBaseTransform
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*
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* This base class is for parser elements that process data and splits it
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* into separate audio/video/whatever frames.
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*
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* It provides for:
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* <itemizedlist>
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* <listitem><para>One sinkpad and one srcpad</para></listitem>
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* <listitem><para>Handles state changes</para></listitem>
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* <listitem><para>Does flushing</para></listitem>
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* <listitem><para>Push mode</para></listitem>
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* <listitem><para>Pull mode</para></listitem>
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* <listitem><para>Handles events (NEWSEGMENT/EOS/FLUSH)</para></listitem>
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* <listitem><para>Handles seeking in both modes</para></listitem>
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* <listitem><para>
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* Handles POSITION/DURATION/SEEKING/FORMAT/CONVERT queries
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* </para></listitem>
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* </itemizedlist>
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*
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* The purpose of this base class is to provide a basic functionality of
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* a parser and share a lot of rather complex code.
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*
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* Description of the parsing mechanism:
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* <orderedlist>
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* <listitem>
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* <itemizedlist><title>Set-up phase</title>
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* <listitem><para>
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* GstBaseParse class calls @set_sink_caps to inform the subclass about
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* incoming sinkpad caps. Subclass should set the srcpad caps accordingly.
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* </para></listitem>
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* <listitem><para>
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* GstBaseParse calls @start to inform subclass that data processing is
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* about to start now.
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* </para></listitem>
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* <listitem><para>
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* At least in this point subclass needs to tell the GstBaseParse class
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* how big data chunks it wants to receive (min_frame_size). It can do
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* this with @gst_base_parse_set_min_frame_size.
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* </para></listitem>
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* <listitem><para>
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* GstBaseParse class sets up appropriate data passing mode (pull/push)
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* and starts to process the data.
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* </para></listitem>
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* </itemizedlist>
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* </listitem>
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* <listitem>
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* <itemizedlist>
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* <title>Parsing phase</title>
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* <listitem><para>
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* GstBaseParse gathers at least min_frame_size bytes of data either
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* by pulling it from upstream or collecting buffers into internal
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* #GstAdapter.
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* </para></listitem>
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* <listitem><para>
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* A buffer of min_frame_size bytes is passed to subclass with
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* @check_valid_frame. Subclass checks the contents and returns TRUE
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* if the buffer contains a valid frame. It also needs to set the
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* @framesize according to the detected frame size. If buffer didn't
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* contain a valid frame, this call must return FALSE and optionally
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* set the @skipsize value to inform base class that how many bytes
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* it needs to skip in order to find a valid frame. The passed buffer
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* is read-only.
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* </para></listitem>
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* <listitem><para>
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* After valid frame is found, it will be passed again to subclass with
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* @parse_frame call. Now subclass is responsible for parsing the
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* frame contents and setting the buffer timestamp, duration and caps.
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* </para></listitem>
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* <listitem><para>
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* Finally the buffer can be pushed downstream and parsing loop starts
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* over again.
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* </para></listitem>
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* <listitem><para>
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* During the parsing process GstBaseClass will handle both srcpad and
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* sinkpad events. They will be passed to subclass if @event or
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* @src_event callbacks have been provided.
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* </para></listitem>
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* </itemizedlist>
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* </listitem>
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* <listitem>
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* <itemizedlist><title>Shutdown phase</title>
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* <listitem><para>
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* GstBaseParse class calls @stop to inform the subclass that data
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* parsing will be stopped.
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* </para></listitem>
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* </itemizedlist>
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* </listitem>
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* </orderedlist>
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*
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* Subclass is responsible for providing pad template caps for
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* source and sink pads. The pads need to be named "sink" and "src". It also
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* needs to set the fixed caps on srcpad, when the format is ensured (e.g.
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* when base class calls subclass' @set_sink_caps function).
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*
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* This base class uses GST_FORMAT_DEFAULT as a meaning of frames. So,
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* subclass conversion routine needs to know that conversion from
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* GST_FORMAT_TIME to GST_FORMAT_DEFAULT must return the
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* frame number that can be found from the given byte position.
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*
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* GstBaseParse uses subclasses conversion methods also for seeking. If
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* subclass doesn't provide @convert function, seeking will get disabled.
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*
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* Subclass @start and @stop functions will be called to inform the beginning
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* and end of data processing.
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*
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* Things that subclass need to take care of:
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* <itemizedlist>
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* <listitem><para>Provide pad templates</para></listitem>
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* <listitem><para>
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* Fixate the source pad caps when appropriate
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* </para></listitem>
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* <listitem><para>
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* Inform base class how big data chunks should be retrieved. This is
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* done with @gst_base_parse_set_min_frame_size function.
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* </para></listitem>
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* <listitem><para>
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* Examine data chunks passed to subclass with @check_valid_frame
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* and tell if they contain a valid frame
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* </para></listitem>
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* <listitem><para>
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* Set the caps and timestamp to frame that is passed to subclass with
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* @parse_frame function.
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* </para></listitem>
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* <listitem><para>Provide conversion functions</para></listitem>
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* <listitem><para>
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* Update the duration information with @gst_base_parse_set_duration
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* </para></listitem>
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* </itemizedlist>
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*
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*/
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/* TODO:
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* - Better segment handling:
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* - NEWSEGMENT for gaps
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* - Not NEWSEGMENT starting at 0 but at first frame timestamp
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* - GstIndex support
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* - Seek table generation and subclass seek entry injection
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* - Accurate seeking
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* - In push mode provide a queue of adapter-"queued" buffers for upstream
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* buffer metadata
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* - Timestamp tracking and setting
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* - Handle upstream timestamps
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* - Queue buffers/events until caps are set
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* - Bitrate tracking => inaccurate seeking, inaccurate duration calculation
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* - Let subclass decide if frames outside the segment should be dropped
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* - Send queries upstream
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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 <stdlib.h>
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#include <string.h>
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#include "gstbaseparse.h"
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GST_DEBUG_CATEGORY_STATIC (gst_base_parse_debug);
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#define GST_CAT_DEFAULT gst_base_parse_debug
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/* Supported formats */
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static GstFormat fmtlist[] = {
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GST_FORMAT_DEFAULT,
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GST_FORMAT_BYTES,
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GST_FORMAT_TIME,
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0
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};
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#define GST_BASE_PARSE_GET_PRIVATE(obj) \
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(G_TYPE_INSTANCE_GET_PRIVATE ((obj), GST_TYPE_BASE_PARSE, GstBaseParsePrivate))
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struct _GstBaseParsePrivate
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{
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GstActivateMode pad_mode;
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gint64 duration;
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GstFormat duration_fmt;
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guint min_frame_size;
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gboolean passthrough;
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gboolean discont;
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gboolean flushing;
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gint64 offset;
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GList *pending_events;
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GstBuffer *cache;
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};
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struct _GstBaseParseClassPrivate
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{
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gpointer _padding;
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};
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static GstElementClass *parent_class = NULL;
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static void gst_base_parse_base_init (gpointer g_class);
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static void gst_base_parse_base_finalize (gpointer g_class);
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static void gst_base_parse_class_init (GstBaseParseClass * klass);
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static void gst_base_parse_init (GstBaseParse * parse,
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GstBaseParseClass * klass);
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GType
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gst_base_parse_get_type (void)
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{
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static GType base_parse_type = 0;
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if (!base_parse_type) {
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static const GTypeInfo base_parse_info = {
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sizeof (GstBaseParseClass),
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(GBaseInitFunc) gst_base_parse_base_init,
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(GBaseFinalizeFunc) gst_base_parse_base_finalize,
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(GClassInitFunc) gst_base_parse_class_init,
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NULL,
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NULL,
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sizeof (GstBaseParse),
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0,
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(GInstanceInitFunc) gst_base_parse_init,
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};
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base_parse_type = g_type_register_static (GST_TYPE_ELEMENT,
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"GstAmrBaseParse", &base_parse_info, G_TYPE_FLAG_ABSTRACT);
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}
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return base_parse_type;
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}
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static void gst_base_parse_finalize (GObject * object);
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static gboolean gst_base_parse_sink_activate (GstPad * sinkpad);
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static gboolean gst_base_parse_sink_activate_push (GstPad * pad,
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gboolean active);
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static gboolean gst_base_parse_sink_activate_pull (GstPad * pad,
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gboolean active);
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static gboolean gst_base_parse_handle_seek (GstBaseParse * parse,
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GstEvent * event);
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static gboolean gst_base_parse_src_event (GstPad * pad, GstEvent * event);
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static gboolean gst_base_parse_sink_event (GstPad * pad, GstEvent * event);
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static gboolean gst_base_parse_query (GstPad * pad, GstQuery * query);
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static gboolean gst_base_parse_sink_setcaps (GstPad * pad, GstCaps * caps);
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static const GstQueryType *gst_base_parse_get_querytypes (GstPad * pad);
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static GstFlowReturn gst_base_parse_chain (GstPad * pad, GstBuffer * buffer);
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static void gst_base_parse_loop (GstPad * pad);
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static gboolean gst_base_parse_check_frame (GstBaseParse * parse,
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GstBuffer * buffer, guint * framesize, gint * skipsize);
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static GstFlowReturn gst_base_parse_parse_frame (GstBaseParse * parse,
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GstBuffer * buffer);
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static gboolean gst_base_parse_sink_eventfunc (GstBaseParse * parse,
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GstEvent * event);
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static gboolean gst_base_parse_src_eventfunc (GstBaseParse * parse,
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GstEvent * event);
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static gboolean gst_base_parse_is_seekable (GstBaseParse * parse);
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static void gst_base_parse_drain (GstBaseParse * parse);
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static void
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gst_base_parse_base_init (gpointer g_class)
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{
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GstBaseParseClass *klass = GST_BASE_PARSE_CLASS (g_class);
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GstBaseParseClassPrivate *priv;
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GST_DEBUG_CATEGORY_INIT (gst_base_parse_debug, "amrbaseparse", 0,
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"baseparse element");
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/* TODO: Remove this once GObject supports class private data */
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priv = g_slice_new0 (GstBaseParseClassPrivate);
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if (klass->priv)
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memcpy (priv, klass->priv, sizeof (GstBaseParseClassPrivate));
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klass->priv = priv;
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}
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static void
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gst_base_parse_base_finalize (gpointer g_class)
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{
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GstBaseParseClass *klass = GST_BASE_PARSE_CLASS (g_class);
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g_slice_free (GstBaseParseClassPrivate, klass->priv);
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klass->priv = NULL;
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}
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static void
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gst_base_parse_finalize (GObject * object)
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{
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GstBaseParse *parse = GST_BASE_PARSE (object);
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g_mutex_free (parse->parse_lock);
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g_object_unref (parse->adapter);
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if (parse->pending_segment) {
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gst_event_replace (&parse->pending_segment, NULL);
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}
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if (parse->close_segment) {
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gst_event_replace (&parse->close_segment, NULL);
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}
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if (parse->priv->cache) {
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gst_buffer_unref (parse->priv->cache);
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parse->priv->cache = NULL;
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}
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g_list_foreach (parse->priv->pending_events, (GFunc) gst_mini_object_unref,
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NULL);
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g_list_free (parse->priv->pending_events);
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parse->priv->pending_events = NULL;
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G_OBJECT_CLASS (parent_class)->finalize (object);
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}
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static void
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gst_base_parse_class_init (GstBaseParseClass * klass)
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{
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GObjectClass *gobject_class;
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gobject_class = G_OBJECT_CLASS (klass);
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g_type_class_add_private (klass, sizeof (GstBaseParsePrivate));
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parent_class = g_type_class_peek_parent (klass);
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gobject_class->finalize = GST_DEBUG_FUNCPTR (gst_base_parse_finalize);
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/* Default handlers */
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klass->check_valid_frame = gst_base_parse_check_frame;
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klass->parse_frame = gst_base_parse_parse_frame;
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klass->event = gst_base_parse_sink_eventfunc;
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klass->src_event = gst_base_parse_src_eventfunc;
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klass->is_seekable = gst_base_parse_is_seekable;
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}
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static void
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gst_base_parse_init (GstBaseParse * parse, GstBaseParseClass * bclass)
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{
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GstPadTemplate *pad_template;
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GST_DEBUG_OBJECT (parse, "gst_base_parse_init");
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parse->priv = GST_BASE_PARSE_GET_PRIVATE (parse);
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pad_template =
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gst_element_class_get_pad_template (GST_ELEMENT_CLASS (bclass), "sink");
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g_return_if_fail (pad_template != NULL);
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parse->sinkpad = gst_pad_new_from_template (pad_template, "sink");
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gst_pad_set_event_function (parse->sinkpad,
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GST_DEBUG_FUNCPTR (gst_base_parse_sink_event));
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gst_pad_set_setcaps_function (parse->sinkpad,
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GST_DEBUG_FUNCPTR (gst_base_parse_sink_setcaps));
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gst_pad_set_chain_function (parse->sinkpad,
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GST_DEBUG_FUNCPTR (gst_base_parse_chain));
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gst_pad_set_activate_function (parse->sinkpad,
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GST_DEBUG_FUNCPTR (gst_base_parse_sink_activate));
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gst_pad_set_activatepush_function (parse->sinkpad,
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GST_DEBUG_FUNCPTR (gst_base_parse_sink_activate_push));
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gst_pad_set_activatepull_function (parse->sinkpad,
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GST_DEBUG_FUNCPTR (gst_base_parse_sink_activate_pull));
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gst_element_add_pad (GST_ELEMENT (parse), parse->sinkpad);
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GST_DEBUG_OBJECT (parse, "sinkpad created");
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pad_template =
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gst_element_class_get_pad_template (GST_ELEMENT_CLASS (bclass), "src");
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g_return_if_fail (pad_template != NULL);
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parse->srcpad = gst_pad_new_from_template (pad_template, "src");
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gst_pad_set_event_function (parse->srcpad,
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GST_DEBUG_FUNCPTR (gst_base_parse_src_event));
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gst_pad_set_query_type_function (parse->srcpad,
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GST_DEBUG_FUNCPTR (gst_base_parse_get_querytypes));
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gst_pad_set_query_function (parse->srcpad,
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GST_DEBUG_FUNCPTR (gst_base_parse_query));
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gst_element_add_pad (GST_ELEMENT (parse), parse->srcpad);
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GST_DEBUG_OBJECT (parse, "src created");
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parse->parse_lock = g_mutex_new ();
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parse->adapter = gst_adapter_new ();
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parse->pending_segment = NULL;
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parse->close_segment = NULL;
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parse->priv->pad_mode = GST_ACTIVATE_NONE;
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parse->priv->duration = -1;
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parse->priv->min_frame_size = 1;
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parse->priv->passthrough = FALSE;
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parse->priv->discont = FALSE;
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parse->priv->flushing = FALSE;
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parse->priv->offset = 0;
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GST_DEBUG_OBJECT (parse, "init ok");
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}
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/**
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* gst_base_parse_check_frame:
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* @parse: #GstBaseParse.
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* @buffer: GstBuffer.
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* @framesize: This will be set to tell the found frame size in bytes.
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* @skipsize: Output parameter that tells how much data needs to be skipped
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* in order to find the following frame header.
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*
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* Default callback for check_valid_frame.
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*
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* Returns: Always TRUE.
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*/
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static gboolean
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gst_base_parse_check_frame (GstBaseParse * parse,
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GstBuffer * buffer, guint * framesize, gint * skipsize)
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{
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*framesize = GST_BUFFER_SIZE (buffer);
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*skipsize = 0;
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return TRUE;
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}
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/**
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* gst_base_parse_parse_frame:
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* @parse: #GstBaseParse.
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* @buffer: #GstBuffer.
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*
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* Default callback for parse_frame.
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*/
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static GstFlowReturn
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gst_base_parse_parse_frame (GstBaseParse * parse, GstBuffer * buffer)
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{
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/* FIXME: Could we even _try_ to do something clever here? */
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GST_BUFFER_TIMESTAMP (buffer) = GST_CLOCK_TIME_NONE;
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GST_BUFFER_DURATION (buffer) = GST_CLOCK_TIME_NONE;
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return GST_FLOW_OK;
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}
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/**
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* gst_base_parse_bytepos_to_time:
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* @parse: #GstBaseParse.
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* @bytepos: Position (in bytes) to be converted.
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* @pos_in_time: #GstClockTime pointer where the result is set.
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*
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* Convert given byte position into #GstClockTime format.
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*
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* Returns: TRUE if conversion succeeded.
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*/
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static gboolean
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gst_base_parse_bytepos_to_time (GstBaseParse * parse, gint64 bytepos,
|
|
GstClockTime * pos_in_time)
|
|
{
|
|
GstBaseParseClass *klass;
|
|
gboolean res = FALSE;
|
|
|
|
klass = GST_BASE_PARSE_GET_CLASS (parse);
|
|
|
|
if (klass->convert) {
|
|
res = klass->convert (parse, GST_FORMAT_BYTES, bytepos,
|
|
GST_FORMAT_TIME, (gint64 *) pos_in_time);
|
|
}
|
|
return res;
|
|
}
|
|
|
|
|
|
/**
|
|
* gst_base_parse_sink_event:
|
|
* @pad: #GstPad that received the event.
|
|
* @event: #GstEvent to be handled.
|
|
*
|
|
* Handler for sink pad events.
|
|
*
|
|
* Returns: TRUE if the event was handled.
|
|
*/
|
|
static gboolean
|
|
gst_base_parse_sink_event (GstPad * pad, GstEvent * event)
|
|
{
|
|
GstBaseParse *parse;
|
|
GstBaseParseClass *bclass;
|
|
gboolean handled = FALSE;
|
|
gboolean ret = TRUE;
|
|
|
|
|
|
parse = GST_BASE_PARSE (gst_pad_get_parent (pad));
|
|
bclass = GST_BASE_PARSE_GET_CLASS (parse);
|
|
|
|
GST_DEBUG_OBJECT (parse, "handling event %d", GST_EVENT_TYPE (event));
|
|
|
|
/* Cache all events except EOS, NEWSEGMENT and FLUSH_STOP if we have a
|
|
* pending segment */
|
|
if (parse->pending_segment && GST_EVENT_TYPE (event) != GST_EVENT_EOS
|
|
&& GST_EVENT_TYPE (event) != GST_EVENT_NEWSEGMENT
|
|
&& GST_EVENT_TYPE (event) != GST_EVENT_FLUSH_START
|
|
&& GST_EVENT_TYPE (event) != GST_EVENT_FLUSH_STOP) {
|
|
parse->priv->pending_events =
|
|
g_list_append (parse->priv->pending_events, event);
|
|
ret = TRUE;
|
|
} else {
|
|
|
|
if (bclass->event)
|
|
handled = bclass->event (parse, event);
|
|
|
|
if (!handled)
|
|
ret = gst_pad_event_default (pad, event);
|
|
}
|
|
|
|
gst_object_unref (parse);
|
|
GST_DEBUG_OBJECT (parse, "event handled");
|
|
return ret;
|
|
}
|
|
|
|
|
|
/**
|
|
* gst_base_parse_sink_eventfunc:
|
|
* @parse: #GstBaseParse.
|
|
* @event: #GstEvent to be handled.
|
|
*
|
|
* Element-level event handler function.
|
|
*
|
|
* Returns: TRUE if the event was handled and not need forwarding.
|
|
*/
|
|
static gboolean
|
|
gst_base_parse_sink_eventfunc (GstBaseParse * parse, GstEvent * event)
|
|
{
|
|
gboolean handled = FALSE;
|
|
GstEvent **eventp;
|
|
|
|
switch (GST_EVENT_TYPE (event)) {
|
|
case GST_EVENT_NEWSEGMENT:
|
|
{
|
|
gdouble rate, applied_rate;
|
|
GstFormat format;
|
|
gint64 start, stop, pos, offset = 0;
|
|
gboolean update;
|
|
|
|
gst_event_parse_new_segment_full (event, &update, &rate, &applied_rate,
|
|
&format, &start, &stop, &pos);
|
|
|
|
|
|
if (format == GST_FORMAT_BYTES) {
|
|
GstClockTime seg_start, seg_stop, seg_pos;
|
|
|
|
/* stop time is allowed to be open-ended, but not start & pos */
|
|
seg_stop = GST_CLOCK_TIME_NONE;
|
|
offset = pos;
|
|
|
|
if (gst_base_parse_bytepos_to_time (parse, start, &seg_start) &&
|
|
gst_base_parse_bytepos_to_time (parse, pos, &seg_pos)) {
|
|
gst_event_unref (event);
|
|
event = gst_event_new_new_segment_full (update, rate, applied_rate,
|
|
GST_FORMAT_TIME, seg_start, seg_stop, seg_pos);
|
|
format = GST_FORMAT_TIME;
|
|
GST_DEBUG_OBJECT (parse, "Converted incoming segment to TIME. "
|
|
"start = %" GST_TIME_FORMAT ", stop = %" GST_TIME_FORMAT
|
|
", pos = %" GST_TIME_FORMAT, GST_TIME_ARGS (seg_start),
|
|
GST_TIME_ARGS (seg_stop), GST_TIME_ARGS (seg_pos));
|
|
}
|
|
}
|
|
|
|
if (format != GST_FORMAT_TIME) {
|
|
/* Unknown incoming segment format. Output a default open-ended
|
|
* TIME segment */
|
|
gst_event_unref (event);
|
|
event = gst_event_new_new_segment_full (update, rate, applied_rate,
|
|
GST_FORMAT_TIME, 0, GST_CLOCK_TIME_NONE, 0);
|
|
}
|
|
|
|
gst_event_parse_new_segment_full (event, &update, &rate, &applied_rate,
|
|
&format, &start, &stop, &pos);
|
|
|
|
gst_segment_set_newsegment_full (&parse->segment, update, rate,
|
|
applied_rate, format, start, stop, pos);
|
|
|
|
GST_DEBUG_OBJECT (parse, "Created newseg rate %g, applied rate %g, "
|
|
"format %d, start = %" GST_TIME_FORMAT ", stop = %" GST_TIME_FORMAT
|
|
", pos = %" GST_TIME_FORMAT, rate, applied_rate, format,
|
|
GST_TIME_ARGS (start), GST_TIME_ARGS (stop), GST_TIME_ARGS (pos));
|
|
|
|
/* save the segment for later, right before we push a new buffer so that
|
|
* the caps are fixed and the next linked element can receive
|
|
* the segment. */
|
|
eventp = &parse->pending_segment;
|
|
gst_event_replace (eventp, event);
|
|
gst_event_unref (event);
|
|
handled = TRUE;
|
|
|
|
/* but finish the current segment */
|
|
GST_DEBUG_OBJECT (parse, "draining current segment");
|
|
gst_base_parse_drain (parse);
|
|
gst_adapter_clear (parse->adapter);
|
|
parse->priv->offset = offset;
|
|
break;
|
|
}
|
|
|
|
case GST_EVENT_FLUSH_START:
|
|
parse->priv->flushing = TRUE;
|
|
handled = gst_pad_push_event (parse->srcpad, event);
|
|
/* Wait for _chain() to exit by taking the srcpad STREAM_LOCK */
|
|
GST_PAD_STREAM_LOCK (parse->srcpad);
|
|
GST_PAD_STREAM_UNLOCK (parse->srcpad);
|
|
|
|
break;
|
|
|
|
case GST_EVENT_FLUSH_STOP:
|
|
gst_adapter_clear (parse->adapter);
|
|
parse->priv->flushing = FALSE;
|
|
parse->priv->discont = TRUE;
|
|
break;
|
|
|
|
case GST_EVENT_EOS:
|
|
gst_base_parse_drain (parse);
|
|
break;
|
|
|
|
default:
|
|
break;
|
|
}
|
|
|
|
return handled;
|
|
}
|
|
|
|
|
|
/**
|
|
* gst_base_parse_src_event:
|
|
* @pad: #GstPad that received the event.
|
|
* @event: #GstEvent that was received.
|
|
*
|
|
* Handler for source pad events.
|
|
*
|
|
* Returns: TRUE if the event was handled.
|
|
*/
|
|
static gboolean
|
|
gst_base_parse_src_event (GstPad * pad, GstEvent * event)
|
|
{
|
|
GstBaseParse *parse;
|
|
GstBaseParseClass *bclass;
|
|
gboolean handled = FALSE;
|
|
gboolean ret = TRUE;
|
|
|
|
parse = GST_BASE_PARSE (gst_pad_get_parent (pad));
|
|
bclass = GST_BASE_PARSE_GET_CLASS (parse);
|
|
|
|
GST_DEBUG_OBJECT (parse, "event %d, %s", GST_EVENT_TYPE (event),
|
|
GST_EVENT_TYPE_NAME (event));
|
|
|
|
if (bclass->src_event)
|
|
handled = bclass->src_event (parse, event);
|
|
|
|
if (!handled)
|
|
ret = gst_pad_event_default (pad, event);
|
|
|
|
gst_object_unref (parse);
|
|
return ret;
|
|
}
|
|
|
|
|
|
/**
|
|
* gst_base_parse_src_eventfunc:
|
|
* @parse: #GstBaseParse.
|
|
* @event: #GstEvent that was received.
|
|
*
|
|
* Default srcpad event handler.
|
|
*
|
|
* Returns: TRUE if the event was handled and can be dropped.
|
|
*/
|
|
static gboolean
|
|
gst_base_parse_src_eventfunc (GstBaseParse * parse, GstEvent * event)
|
|
{
|
|
gboolean handled = FALSE;
|
|
GstBaseParseClass *bclass;
|
|
|
|
bclass = GST_BASE_PARSE_GET_CLASS (parse);
|
|
|
|
switch (GST_EVENT_TYPE (event)) {
|
|
case GST_EVENT_SEEK:
|
|
{
|
|
if (bclass->is_seekable (parse)) {
|
|
handled = gst_base_parse_handle_seek (parse, event);
|
|
gst_event_unref (event);
|
|
}
|
|
break;
|
|
}
|
|
default:
|
|
break;
|
|
}
|
|
return handled;
|
|
}
|
|
|
|
|
|
/**
|
|
* gst_base_parse_is_seekable:
|
|
* @parse: #GstBaseParse.
|
|
*
|
|
* Default handler for is_seekable.
|
|
*
|
|
* Returns: Always TRUE.
|
|
*/
|
|
static gboolean
|
|
gst_base_parse_is_seekable (GstBaseParse * parse)
|
|
{
|
|
return TRUE;
|
|
}
|
|
|
|
|
|
/**
|
|
* gst_base_parse_handle_and_push_buffer:
|
|
* @parse: #GstBaseParse.
|
|
* @klass: #GstBaseParseClass.
|
|
* @buffer: #GstBuffer.
|
|
*
|
|
* Parses the frame from given buffer and pushes it forward. Also performs
|
|
* timestamp handling and checks the segment limits.
|
|
*
|
|
* This is called with srcpad STREAM_LOCK held.
|
|
*
|
|
* Returns: #GstFlowReturn
|
|
*/
|
|
static GstFlowReturn
|
|
gst_base_parse_handle_and_push_buffer (GstBaseParse * parse,
|
|
GstBaseParseClass * klass, GstBuffer * buffer)
|
|
{
|
|
GstFlowReturn ret;
|
|
|
|
if (parse->priv->discont) {
|
|
GST_DEBUG_OBJECT (parse, "marking DISCONT");
|
|
GST_BUFFER_FLAG_SET (buffer, GST_BUFFER_FLAG_DISCONT);
|
|
parse->priv->discont = FALSE;
|
|
}
|
|
|
|
ret = klass->parse_frame (parse, buffer);
|
|
|
|
/* FIXME: Check the output buffer for any missing metadata,
|
|
* keep track of timestamp and calculate everything possible
|
|
* if not set already */
|
|
|
|
/* First buffers are dropped, this means that the subclass needs more
|
|
* frames to decide on the format and queues them internally */
|
|
if (ret == GST_BASE_PARSE_FLOW_DROPPED && !GST_PAD_CAPS (parse->srcpad)) {
|
|
gst_buffer_unref (buffer);
|
|
return GST_FLOW_OK;
|
|
}
|
|
|
|
/* convert internal flow to OK and mark discont for the next buffer. */
|
|
if (ret == GST_BASE_PARSE_FLOW_DROPPED) {
|
|
parse->priv->discont = TRUE;
|
|
ret = GST_FLOW_OK;
|
|
|
|
gst_buffer_unref (buffer);
|
|
|
|
return ret;
|
|
} else if (ret != GST_FLOW_OK) {
|
|
return ret;
|
|
}
|
|
|
|
return gst_base_parse_push_buffer (parse, buffer);
|
|
}
|
|
|
|
/**
|
|
* gst_base_parse_push_buffer:
|
|
* @parse: #GstBaseParse.
|
|
* @buffer: #GstBuffer.
|
|
*
|
|
* Pushes the buffer downstream, sends any pending events and
|
|
* does some timestamp and segment handling.
|
|
*
|
|
* This must be called with srcpad STREAM_LOCK held.
|
|
*
|
|
* Returns: #GstFlowReturn
|
|
*/
|
|
GstFlowReturn
|
|
gst_base_parse_push_buffer (GstBaseParse * parse, GstBuffer * buffer)
|
|
{
|
|
GstFlowReturn ret = GST_FLOW_OK;
|
|
GstClockTime last_stop = GST_CLOCK_TIME_NONE;
|
|
|
|
if (GST_BUFFER_TIMESTAMP_IS_VALID (buffer))
|
|
last_stop = GST_BUFFER_TIMESTAMP (buffer);
|
|
if (last_stop != GST_CLOCK_TIME_NONE && GST_BUFFER_DURATION_IS_VALID (buffer))
|
|
last_stop += GST_BUFFER_DURATION (buffer);
|
|
|
|
/* should have caps by now */
|
|
g_return_val_if_fail (GST_PAD_CAPS (parse->srcpad), GST_FLOW_ERROR);
|
|
|
|
gst_buffer_set_caps (buffer, GST_PAD_CAPS (parse->srcpad));
|
|
|
|
/* and should then also be linked downstream, so safe to send some events */
|
|
if (parse->priv->pad_mode == GST_ACTIVATE_PULL) {
|
|
if (G_UNLIKELY (parse->close_segment)) {
|
|
GST_DEBUG_OBJECT (parse, "loop sending close segment");
|
|
gst_pad_push_event (parse->srcpad, parse->close_segment);
|
|
parse->close_segment = NULL;
|
|
}
|
|
|
|
if (G_UNLIKELY (parse->pending_segment)) {
|
|
GST_DEBUG_OBJECT (parse, "loop push pending segment");
|
|
gst_pad_push_event (parse->srcpad, parse->pending_segment);
|
|
parse->pending_segment = NULL;
|
|
}
|
|
} else {
|
|
if (G_UNLIKELY (parse->pending_segment)) {
|
|
GST_DEBUG_OBJECT (parse, "chain pushing a pending segment");
|
|
gst_pad_push_event (parse->srcpad, parse->pending_segment);
|
|
parse->pending_segment = NULL;
|
|
}
|
|
}
|
|
|
|
if (G_UNLIKELY (parse->priv->pending_events)) {
|
|
GList *l;
|
|
|
|
for (l = parse->priv->pending_events; l != NULL; l = l->next) {
|
|
gst_pad_push_event (parse->srcpad, GST_EVENT (l->data));
|
|
}
|
|
g_list_free (parse->priv->pending_events);
|
|
parse->priv->pending_events = NULL;
|
|
}
|
|
|
|
/* TODO: Add to seek table */
|
|
|
|
if (GST_BUFFER_TIMESTAMP_IS_VALID (buffer) &&
|
|
GST_CLOCK_TIME_IS_VALID (parse->segment.stop) &&
|
|
GST_BUFFER_TIMESTAMP (buffer) > parse->segment.stop) {
|
|
GST_LOG_OBJECT (parse, "Dropped frame, after segment");
|
|
gst_buffer_unref (buffer);
|
|
} else if (GST_BUFFER_TIMESTAMP_IS_VALID (buffer) &&
|
|
GST_BUFFER_DURATION_IS_VALID (buffer) &&
|
|
GST_CLOCK_TIME_IS_VALID (parse->segment.start) &&
|
|
GST_BUFFER_TIMESTAMP (buffer) + GST_BUFFER_DURATION (buffer)
|
|
< parse->segment.start) {
|
|
/* FIXME: subclass needs way to override the start as downstream might
|
|
* need frames before for proper decoding */
|
|
GST_LOG_OBJECT (parse, "Dropped frame, before segment");
|
|
gst_buffer_unref (buffer);
|
|
} else {
|
|
ret = gst_pad_push (parse->srcpad, buffer);
|
|
GST_LOG_OBJECT (parse, "frame (%d bytes) pushed: %d",
|
|
GST_BUFFER_SIZE (buffer), ret);
|
|
}
|
|
|
|
/* Update current running segment position */
|
|
if (ret == GST_FLOW_OK && last_stop != GST_CLOCK_TIME_NONE)
|
|
gst_segment_set_last_stop (&parse->segment, GST_FORMAT_TIME, last_stop);
|
|
|
|
return ret;
|
|
}
|
|
|
|
|
|
/**
|
|
* gst_base_parse_drain:
|
|
* @parse: #GstBaseParse.
|
|
*
|
|
* Drains the adapter until it is empty. It decreases the min_frame_size to
|
|
* match the current adapter size and calls chain method until the adapter
|
|
* is emptied or chain returns with error.
|
|
*/
|
|
static void
|
|
gst_base_parse_drain (GstBaseParse * parse)
|
|
{
|
|
guint avail;
|
|
|
|
GST_DEBUG_OBJECT (parse, "draining");
|
|
|
|
for (;;) {
|
|
avail = gst_adapter_available (parse->adapter);
|
|
if (!avail)
|
|
break;
|
|
|
|
gst_base_parse_set_min_frame_size (parse, avail);
|
|
if (gst_base_parse_chain (parse->sinkpad, NULL) != GST_FLOW_OK) {
|
|
break;
|
|
}
|
|
|
|
/* nothing changed, maybe due to truncated frame; break infinite loop */
|
|
if (avail == gst_adapter_available (parse->adapter)) {
|
|
GST_DEBUG_OBJECT (parse, "no change during draining; flushing");
|
|
gst_adapter_clear (parse->adapter);
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
/**
|
|
* gst_base_parse_chain:
|
|
* @pad: #GstPad.
|
|
* @buffer: #GstBuffer.
|
|
*
|
|
* Returns: #GstFlowReturn.
|
|
*/
|
|
static GstFlowReturn
|
|
gst_base_parse_chain (GstPad * pad, GstBuffer * buffer)
|
|
{
|
|
GstBaseParseClass *bclass;
|
|
GstBaseParse *parse;
|
|
GstFlowReturn ret = GST_FLOW_OK;
|
|
GstBuffer *outbuf = NULL;
|
|
GstBuffer *tmpbuf = NULL;
|
|
guint fsize = 0;
|
|
gint skip = -1;
|
|
const guint8 *data;
|
|
guint min_size;
|
|
|
|
parse = GST_BASE_PARSE (GST_OBJECT_PARENT (pad));
|
|
bclass = GST_BASE_PARSE_GET_CLASS (parse);
|
|
|
|
if (G_LIKELY (buffer)) {
|
|
GST_LOG_OBJECT (parse, "buffer size: %d, offset = %lld",
|
|
GST_BUFFER_SIZE (buffer), GST_BUFFER_OFFSET (buffer));
|
|
if (G_UNLIKELY (parse->priv->passthrough)) {
|
|
buffer = gst_buffer_make_metadata_writable (buffer);
|
|
return gst_base_parse_push_buffer (parse, buffer);
|
|
} else
|
|
gst_adapter_push (parse->adapter, buffer);
|
|
}
|
|
|
|
/* Parse and push as many frames as possible */
|
|
/* Stop either when adapter is empty or we are flushing */
|
|
while (!parse->priv->flushing) {
|
|
tmpbuf = gst_buffer_new ();
|
|
|
|
/* Synchronization loop */
|
|
for (;;) {
|
|
GST_BASE_PARSE_LOCK (parse);
|
|
min_size = parse->priv->min_frame_size;
|
|
GST_BASE_PARSE_UNLOCK (parse);
|
|
|
|
/* Collect at least min_frame_size bytes */
|
|
if (gst_adapter_available (parse->adapter) < min_size) {
|
|
GST_DEBUG_OBJECT (parse, "not enough data available (only %d bytes)",
|
|
gst_adapter_available (parse->adapter));
|
|
gst_buffer_unref (tmpbuf);
|
|
goto done;
|
|
}
|
|
|
|
data = gst_adapter_peek (parse->adapter, min_size);
|
|
GST_BUFFER_DATA (tmpbuf) = (guint8 *) data;
|
|
GST_BUFFER_SIZE (tmpbuf) = min_size;
|
|
GST_BUFFER_OFFSET (tmpbuf) = parse->priv->offset;
|
|
GST_BUFFER_FLAG_SET (tmpbuf, GST_MINI_OBJECT_FLAG_READONLY);
|
|
|
|
if (parse->priv->discont) {
|
|
GST_DEBUG_OBJECT (parse, "marking DISCONT");
|
|
GST_BUFFER_FLAG_SET (tmpbuf, GST_BUFFER_FLAG_DISCONT);
|
|
}
|
|
|
|
skip = -1;
|
|
if (bclass->check_valid_frame (parse, tmpbuf, &fsize, &skip)) {
|
|
if (gst_adapter_available (parse->adapter) < fsize) {
|
|
GST_DEBUG_OBJECT (parse,
|
|
"found valid frame but not enough data available (only %d bytes)",
|
|
gst_adapter_available (parse->adapter));
|
|
gst_buffer_unref (tmpbuf);
|
|
goto done;
|
|
}
|
|
break;
|
|
}
|
|
if (skip > 0) {
|
|
GST_LOG_OBJECT (parse, "finding sync, skipping %d bytes", skip);
|
|
gst_adapter_flush (parse->adapter, skip);
|
|
parse->priv->offset += skip;
|
|
} else if (skip == -1) {
|
|
/* subclass didn't touch this value. By default we skip 1 byte */
|
|
GST_LOG_OBJECT (parse, "finding sync, skipping 1 byte");
|
|
gst_adapter_flush (parse->adapter, 1);
|
|
parse->priv->offset++;
|
|
}
|
|
/* There is a possibility that subclass set the skip value to zero.
|
|
This means that it has probably found a frame but wants to ask
|
|
more data (by increasing the min_size) to be sure of this. */
|
|
}
|
|
gst_buffer_unref (tmpbuf);
|
|
tmpbuf = NULL;
|
|
|
|
if (skip > 0) {
|
|
/* Subclass found the sync, but still wants to skip some data */
|
|
GST_LOG_OBJECT (parse, "skipping %d bytes", skip);
|
|
gst_adapter_flush (parse->adapter, skip);
|
|
parse->priv->offset += skip;
|
|
}
|
|
|
|
/* Grab lock to prevent a race with FLUSH_START handler */
|
|
GST_PAD_STREAM_LOCK (parse->srcpad);
|
|
|
|
/* FLUSH_START event causes the "flushing" flag to be set. In this
|
|
* case we can leave the frame pushing loop */
|
|
if (parse->priv->flushing) {
|
|
GST_PAD_STREAM_UNLOCK (parse->srcpad);
|
|
break;
|
|
}
|
|
|
|
/* FIXME: Would it be more efficient to make a subbuffer instead? */
|
|
outbuf = gst_adapter_take_buffer (parse->adapter, fsize);
|
|
|
|
/* Subclass may want to know the data offset */
|
|
GST_BUFFER_OFFSET (outbuf) = parse->priv->offset;
|
|
parse->priv->offset += fsize;
|
|
|
|
ret = gst_base_parse_handle_and_push_buffer (parse, bclass, outbuf);
|
|
GST_PAD_STREAM_UNLOCK (parse->srcpad);
|
|
|
|
if (ret != GST_FLOW_OK) {
|
|
GST_LOG_OBJECT (parse, "push returned %d", ret);
|
|
break;
|
|
}
|
|
}
|
|
|
|
done:
|
|
GST_LOG_OBJECT (parse, "chain leaving");
|
|
return ret;
|
|
}
|
|
|
|
static GstFlowReturn
|
|
gst_base_parse_pull_range (GstBaseParse * parse, guint size,
|
|
GstBuffer ** buffer)
|
|
{
|
|
GstFlowReturn ret = GST_FLOW_OK;
|
|
|
|
g_return_val_if_fail (buffer != NULL, GST_FLOW_ERROR);
|
|
|
|
/* Caching here actually makes much less difference than one would expect.
|
|
* We do it mainly to avoid pulling buffers of 1 byte all the time */
|
|
if (parse->priv->cache) {
|
|
guint64 cache_offset = GST_BUFFER_OFFSET (parse->priv->cache);
|
|
guint cache_size = GST_BUFFER_SIZE (parse->priv->cache);
|
|
|
|
if (cache_offset <= parse->priv->offset &&
|
|
(parse->priv->offset + size) < (cache_offset + cache_size)) {
|
|
*buffer = gst_buffer_create_sub (parse->priv->cache,
|
|
parse->priv->offset - cache_offset, size);
|
|
GST_BUFFER_OFFSET (*buffer) = parse->priv->offset;
|
|
return GST_FLOW_OK;
|
|
}
|
|
/* not enough data in the cache, free cache and get a new one */
|
|
gst_buffer_unref (parse->priv->cache);
|
|
parse->priv->cache = NULL;
|
|
}
|
|
|
|
/* refill the cache */
|
|
ret =
|
|
gst_pad_pull_range (parse->sinkpad, parse->priv->offset, MAX (size,
|
|
64 * 1024), &parse->priv->cache);
|
|
if (ret != GST_FLOW_OK) {
|
|
parse->priv->cache = NULL;
|
|
return ret;
|
|
}
|
|
|
|
if (GST_BUFFER_SIZE (parse->priv->cache) >= size) {
|
|
*buffer = gst_buffer_create_sub (parse->priv->cache, 0, size);
|
|
GST_BUFFER_OFFSET (*buffer) = parse->priv->offset;
|
|
return GST_FLOW_OK;
|
|
}
|
|
|
|
/* Not possible to get enough data, try a last time with
|
|
* requesting exactly the size we need */
|
|
gst_buffer_unref (parse->priv->cache);
|
|
parse->priv->cache = NULL;
|
|
|
|
ret = gst_pad_pull_range (parse->sinkpad, parse->priv->offset, size,
|
|
&parse->priv->cache);
|
|
|
|
if (ret != GST_FLOW_OK) {
|
|
GST_DEBUG_OBJECT (parse, "pull_range returned %d", ret);
|
|
*buffer = NULL;
|
|
return ret;
|
|
}
|
|
|
|
if (GST_BUFFER_SIZE (parse->priv->cache) < size) {
|
|
GST_WARNING_OBJECT (parse, "Dropping short buffer at offset %"
|
|
G_GUINT64_FORMAT ": wanted %u bytes, got %u bytes", parse->priv->offset,
|
|
size, GST_BUFFER_SIZE (parse->priv->cache));
|
|
|
|
gst_buffer_unref (parse->priv->cache);
|
|
parse->priv->cache = NULL;
|
|
|
|
*buffer = NULL;
|
|
return GST_FLOW_UNEXPECTED;
|
|
}
|
|
|
|
*buffer = gst_buffer_create_sub (parse->priv->cache, 0, size);
|
|
GST_BUFFER_OFFSET (*buffer) = parse->priv->offset;
|
|
|
|
return GST_FLOW_OK;
|
|
}
|
|
|
|
/**
|
|
* gst_base_parse_loop:
|
|
* @pad: GstPad
|
|
*
|
|
* Loop that is used in pull mode to retrieve data from upstream.
|
|
*/
|
|
static void
|
|
gst_base_parse_loop (GstPad * pad)
|
|
{
|
|
GstBaseParse *parse;
|
|
GstBaseParseClass *klass;
|
|
GstBuffer *buffer, *outbuf;
|
|
gboolean ret = FALSE;
|
|
guint fsize = 0, min_size;
|
|
gint skip = 0;
|
|
|
|
parse = GST_BASE_PARSE (gst_pad_get_parent (pad));
|
|
klass = GST_BASE_PARSE_GET_CLASS (parse);
|
|
|
|
/* TODO: Check if we reach segment stop limit */
|
|
|
|
while (TRUE) {
|
|
|
|
GST_BASE_PARSE_LOCK (parse);
|
|
min_size = parse->priv->min_frame_size;
|
|
GST_BASE_PARSE_UNLOCK (parse);
|
|
|
|
ret = gst_base_parse_pull_range (parse, min_size, &buffer);
|
|
|
|
if (ret == GST_FLOW_UNEXPECTED)
|
|
goto eos;
|
|
else if (ret != GST_FLOW_OK)
|
|
goto need_pause;
|
|
|
|
if (parse->priv->discont) {
|
|
GST_DEBUG_OBJECT (parse, "marking DISCONT");
|
|
GST_BUFFER_FLAG_SET (buffer, GST_BUFFER_FLAG_DISCONT);
|
|
}
|
|
|
|
skip = -1;
|
|
if (klass->check_valid_frame (parse, buffer, &fsize, &skip)) {
|
|
break;
|
|
}
|
|
if (skip > 0) {
|
|
GST_LOG_OBJECT (parse, "finding sync, skipping %d bytes", skip);
|
|
parse->priv->offset += skip;
|
|
} else if (skip == -1) {
|
|
GST_LOG_OBJECT (parse, "finding sync, skipping 1 byte");
|
|
parse->priv->offset++;
|
|
}
|
|
GST_DEBUG_OBJECT (parse, "finding sync...");
|
|
gst_buffer_unref (buffer);
|
|
}
|
|
|
|
if (fsize <= GST_BUFFER_SIZE (buffer)) {
|
|
outbuf = gst_buffer_create_sub (buffer, 0, fsize);
|
|
GST_BUFFER_OFFSET (outbuf) = GST_BUFFER_OFFSET (buffer);
|
|
gst_buffer_unref (buffer);
|
|
} else {
|
|
gst_buffer_unref (buffer);
|
|
ret = gst_base_parse_pull_range (parse, fsize, &outbuf);
|
|
|
|
if (ret == GST_FLOW_UNEXPECTED)
|
|
goto eos;
|
|
else if (ret != GST_FLOW_OK)
|
|
goto need_pause;
|
|
}
|
|
|
|
parse->priv->offset += fsize;
|
|
|
|
/* Does the subclass want to skip too? */
|
|
if (skip > 0)
|
|
parse->priv->offset += skip;
|
|
|
|
/* This always unrefs the outbuf, even if error occurs */
|
|
ret = gst_base_parse_handle_and_push_buffer (parse, klass, outbuf);
|
|
|
|
if (ret != GST_FLOW_OK) {
|
|
GST_DEBUG_OBJECT (parse, "flow: %s", gst_flow_get_name (ret));
|
|
if (GST_FLOW_IS_FATAL (ret)) {
|
|
GST_ELEMENT_ERROR (parse, STREAM, FAILED, (NULL),
|
|
("streaming task paused, reason: %s", gst_flow_get_name (ret)));
|
|
gst_pad_push_event (parse->srcpad, gst_event_new_eos ());
|
|
}
|
|
goto need_pause;
|
|
}
|
|
|
|
gst_object_unref (parse);
|
|
return;
|
|
|
|
need_pause:
|
|
{
|
|
GST_LOG_OBJECT (parse, "pausing task");
|
|
gst_pad_pause_task (pad);
|
|
gst_object_unref (parse);
|
|
return;
|
|
}
|
|
eos:
|
|
{
|
|
GST_LOG_OBJECT (parse, "pausing task %d", ret);
|
|
gst_pad_push_event (parse->srcpad, gst_event_new_eos ());
|
|
gst_pad_pause_task (pad);
|
|
gst_object_unref (parse);
|
|
return;
|
|
}
|
|
}
|
|
|
|
|
|
/**
|
|
* gst_base_parse_sink_activate:
|
|
* @sinkpad: #GstPad to be activated.
|
|
*
|
|
* Returns: TRUE if activation succeeded.
|
|
*/
|
|
static gboolean
|
|
gst_base_parse_sink_activate (GstPad * sinkpad)
|
|
{
|
|
GstBaseParse *parse;
|
|
gboolean result = TRUE;
|
|
|
|
parse = GST_BASE_PARSE (gst_pad_get_parent (sinkpad));
|
|
|
|
GST_DEBUG_OBJECT (parse, "sink activate");
|
|
|
|
if (gst_pad_check_pull_range (sinkpad)) {
|
|
GST_DEBUG_OBJECT (parse, "trying to activate in pull mode");
|
|
result = gst_pad_activate_pull (sinkpad, TRUE);
|
|
} else {
|
|
GST_DEBUG_OBJECT (parse, "trying to activate in push mode");
|
|
result = gst_pad_activate_push (sinkpad, TRUE);
|
|
}
|
|
|
|
GST_DEBUG_OBJECT (parse, "sink activate return %d", result);
|
|
gst_object_unref (parse);
|
|
return result;
|
|
}
|
|
|
|
|
|
/**
|
|
* gst_base_parse_activate:
|
|
* @parse: #GstBaseParse.
|
|
* @active: TRUE if element will be activated, FALSE if disactivated.
|
|
*
|
|
* Returns: TRUE if the operation succeeded.
|
|
*/
|
|
static gboolean
|
|
gst_base_parse_activate (GstBaseParse * parse, gboolean active)
|
|
{
|
|
GstBaseParseClass *klass;
|
|
gboolean result = FALSE;
|
|
|
|
GST_DEBUG_OBJECT (parse, "activate");
|
|
|
|
klass = GST_BASE_PARSE_GET_CLASS (parse);
|
|
|
|
if (active) {
|
|
if (parse->priv->pad_mode == GST_ACTIVATE_NONE && klass->start)
|
|
result = klass->start (parse);
|
|
|
|
GST_OBJECT_LOCK (parse);
|
|
gst_segment_init (&parse->segment, GST_FORMAT_TIME);
|
|
parse->priv->duration = -1;
|
|
parse->priv->discont = FALSE;
|
|
parse->priv->flushing = FALSE;
|
|
parse->priv->offset = 0;
|
|
|
|
if (parse->pending_segment)
|
|
gst_event_unref (parse->pending_segment);
|
|
|
|
parse->pending_segment =
|
|
gst_event_new_new_segment (FALSE, parse->segment.rate,
|
|
parse->segment.format,
|
|
parse->segment.start, parse->segment.stop, parse->segment.last_stop);
|
|
|
|
GST_OBJECT_UNLOCK (parse);
|
|
} else {
|
|
/* We must make sure streaming has finished before resetting things
|
|
* and calling the ::stop vfunc */
|
|
GST_PAD_STREAM_LOCK (parse->sinkpad);
|
|
GST_PAD_STREAM_UNLOCK (parse->sinkpad);
|
|
|
|
if (parse->priv->pad_mode != GST_ACTIVATE_NONE && klass->stop)
|
|
result = klass->stop (parse);
|
|
|
|
g_list_foreach (parse->priv->pending_events, (GFunc) gst_mini_object_unref,
|
|
NULL);
|
|
g_list_free (parse->priv->pending_events);
|
|
parse->priv->pending_events = NULL;
|
|
|
|
if (parse->priv->cache) {
|
|
gst_buffer_unref (parse->priv->cache);
|
|
parse->priv->cache = NULL;
|
|
}
|
|
|
|
parse->priv->pad_mode = GST_ACTIVATE_NONE;
|
|
}
|
|
GST_DEBUG_OBJECT (parse, "activate: %d", result);
|
|
return result;
|
|
}
|
|
|
|
|
|
/**
|
|
* gst_base_parse_sink_activate_push:
|
|
* @pad: #GstPad to be (de)activated.
|
|
* @active: TRUE when activating, FALSE when deactivating.
|
|
*
|
|
* Returns: TRUE if (de)activation succeeded.
|
|
*/
|
|
static gboolean
|
|
gst_base_parse_sink_activate_push (GstPad * pad, gboolean active)
|
|
{
|
|
gboolean result = TRUE;
|
|
GstBaseParse *parse;
|
|
|
|
parse = GST_BASE_PARSE (gst_pad_get_parent (pad));
|
|
|
|
GST_DEBUG_OBJECT (parse, "sink activate push");
|
|
|
|
result = gst_base_parse_activate (parse, active);
|
|
|
|
if (result)
|
|
parse->priv->pad_mode = active ? GST_ACTIVATE_PUSH : GST_ACTIVATE_NONE;
|
|
|
|
GST_DEBUG_OBJECT (parse, "sink activate push: %d", result);
|
|
|
|
gst_object_unref (parse);
|
|
return result;
|
|
}
|
|
|
|
|
|
/**
|
|
* gst_base_parse_sink_activate_pull:
|
|
* @sinkpad: #GstPad to be (de)activated.
|
|
* @active: TRUE when activating, FALSE when deactivating.
|
|
*
|
|
* Returns: TRUE if (de)activation succeeded.
|
|
*/
|
|
static gboolean
|
|
gst_base_parse_sink_activate_pull (GstPad * sinkpad, gboolean active)
|
|
{
|
|
gboolean result = FALSE;
|
|
GstBaseParse *parse;
|
|
|
|
parse = GST_BASE_PARSE (gst_pad_get_parent (sinkpad));
|
|
|
|
GST_DEBUG_OBJECT (parse, "activate pull");
|
|
|
|
result = gst_base_parse_activate (parse, active);
|
|
|
|
if (result) {
|
|
if (active) {
|
|
result &= gst_pad_start_task (sinkpad,
|
|
(GstTaskFunction) gst_base_parse_loop, sinkpad);
|
|
} else {
|
|
result &= gst_pad_stop_task (sinkpad);
|
|
}
|
|
}
|
|
|
|
if (result)
|
|
parse->priv->pad_mode = active ? GST_ACTIVATE_PULL : GST_ACTIVATE_NONE;
|
|
|
|
GST_DEBUG_OBJECT (parse, "sink activate pull: %d", result);
|
|
|
|
gst_object_unref (parse);
|
|
return result;
|
|
}
|
|
|
|
|
|
/**
|
|
* gst_base_parse_set_duration:
|
|
* @parse: #GstBaseParse.
|
|
* @fmt: #GstFormat.
|
|
* @duration: duration value.
|
|
*
|
|
* Sets the duration of the currently playing media. Subclass can use this
|
|
* when it notices a change in the media duration.
|
|
*/
|
|
void
|
|
gst_base_parse_set_duration (GstBaseParse * parse,
|
|
GstFormat fmt, gint64 duration)
|
|
{
|
|
g_return_if_fail (parse != NULL);
|
|
|
|
GST_BASE_PARSE_LOCK (parse);
|
|
if (duration != parse->priv->duration) {
|
|
GstMessage *m;
|
|
|
|
m = gst_message_new_duration (GST_OBJECT (parse), fmt, duration);
|
|
gst_element_post_message (GST_ELEMENT (parse), m);
|
|
|
|
/* TODO: what about duration tag? */
|
|
}
|
|
parse->priv->duration = duration;
|
|
parse->priv->duration_fmt = fmt;
|
|
GST_DEBUG_OBJECT (parse, "set duration: %lld", duration);
|
|
GST_BASE_PARSE_UNLOCK (parse);
|
|
}
|
|
|
|
|
|
/**
|
|
* gst_base_parse_set_min_frame_size:
|
|
* @parse: #GstBaseParse.
|
|
* @min_size: Minimum size of the data that this base class should give to
|
|
* subclass.
|
|
*
|
|
* Subclass can use this function to tell the base class that it needs to
|
|
* give at least #min_size buffers.
|
|
*/
|
|
void
|
|
gst_base_parse_set_min_frame_size (GstBaseParse * parse, guint min_size)
|
|
{
|
|
g_return_if_fail (parse != NULL);
|
|
|
|
GST_BASE_PARSE_LOCK (parse);
|
|
parse->priv->min_frame_size = min_size;
|
|
GST_LOG_OBJECT (parse, "set frame_min_size: %d", min_size);
|
|
GST_BASE_PARSE_UNLOCK (parse);
|
|
}
|
|
|
|
/**
|
|
* gst_base_transform_set_passthrough:
|
|
* @trans: the #GstBaseTransform to set
|
|
* @passthrough: boolean indicating passthrough mode.
|
|
*
|
|
* Set passthrough mode for this filter by default. This is mostly
|
|
* useful for filters that do not care about negotiation.
|
|
*
|
|
* Always TRUE for filters which don't implement either a transform
|
|
* or transform_ip method.
|
|
*
|
|
* MT safe.
|
|
*/
|
|
void
|
|
gst_base_parse_set_passthrough (GstBaseParse * parse, gboolean passthrough)
|
|
{
|
|
g_return_if_fail (parse != NULL);
|
|
|
|
GST_BASE_PARSE_LOCK (parse);
|
|
parse->priv->passthrough = passthrough;
|
|
GST_LOG_OBJECT (parse, "set passthrough: %d", passthrough);
|
|
GST_BASE_PARSE_UNLOCK (parse);
|
|
}
|
|
|
|
|
|
/**
|
|
* gst_base_parse_get_querytypes:
|
|
* @pad: GstPad
|
|
*
|
|
* Returns: A table of #GstQueryType items describing supported query types.
|
|
*/
|
|
static const GstQueryType *
|
|
gst_base_parse_get_querytypes (GstPad * pad)
|
|
{
|
|
static const GstQueryType list[] = {
|
|
GST_QUERY_POSITION,
|
|
GST_QUERY_DURATION,
|
|
GST_QUERY_FORMATS,
|
|
GST_QUERY_SEEKING,
|
|
GST_QUERY_CONVERT,
|
|
0
|
|
};
|
|
|
|
return list;
|
|
}
|
|
|
|
|
|
/**
|
|
* gst_base_parse_query:
|
|
* @pad: #GstPad.
|
|
* @query: #GstQuery.
|
|
*
|
|
* Returns: TRUE on success.
|
|
*/
|
|
static gboolean
|
|
gst_base_parse_query (GstPad * pad, GstQuery * query)
|
|
{
|
|
GstBaseParse *parse;
|
|
GstBaseParseClass *klass;
|
|
gboolean res = FALSE;
|
|
|
|
parse = GST_BASE_PARSE (GST_PAD_PARENT (pad));
|
|
klass = GST_BASE_PARSE_GET_CLASS (parse);
|
|
|
|
/* If subclass doesn't provide conversion function we can't reply
|
|
to the query either */
|
|
if (!klass->convert) {
|
|
return FALSE;
|
|
}
|
|
|
|
switch (GST_QUERY_TYPE (query)) {
|
|
case GST_QUERY_POSITION:
|
|
{
|
|
gint64 dest_value;
|
|
GstFormat format;
|
|
|
|
GST_DEBUG_OBJECT (parse, "position query");
|
|
|
|
gst_query_parse_position (query, &format, NULL);
|
|
|
|
g_mutex_lock (parse->parse_lock);
|
|
|
|
if (format == GST_FORMAT_BYTES) {
|
|
dest_value = parse->priv->offset;
|
|
res = TRUE;
|
|
} else if (format == parse->segment.format &&
|
|
GST_CLOCK_TIME_IS_VALID (parse->segment.last_stop)) {
|
|
dest_value = parse->segment.last_stop;
|
|
res = TRUE;
|
|
} else {
|
|
/* priv->offset is updated in both PUSH/PULL modes */
|
|
res = klass->convert (parse, GST_FORMAT_BYTES, parse->priv->offset,
|
|
format, &dest_value);
|
|
}
|
|
g_mutex_unlock (parse->parse_lock);
|
|
|
|
if (res)
|
|
gst_query_set_position (query, format, dest_value);
|
|
else
|
|
res = gst_pad_query_default (pad, query);
|
|
|
|
break;
|
|
}
|
|
case GST_QUERY_DURATION:
|
|
{
|
|
GstFormat format;
|
|
gint64 dest_value;
|
|
|
|
GST_DEBUG_OBJECT (parse, "duration query");
|
|
|
|
gst_query_parse_duration (query, &format, NULL);
|
|
|
|
g_mutex_lock (parse->parse_lock);
|
|
|
|
if (format == GST_FORMAT_BYTES) {
|
|
res = gst_pad_query_peer_duration (parse->sinkpad, &format,
|
|
&dest_value);
|
|
} else if (parse->priv->duration != -1 &&
|
|
format == parse->priv->duration_fmt) {
|
|
dest_value = parse->priv->duration;
|
|
res = TRUE;
|
|
} else if (parse->priv->duration != -1) {
|
|
res = klass->convert (parse, parse->priv->duration_fmt,
|
|
parse->priv->duration, format, &dest_value);
|
|
}
|
|
|
|
g_mutex_unlock (parse->parse_lock);
|
|
|
|
if (res)
|
|
gst_query_set_duration (query, format, dest_value);
|
|
else
|
|
res = gst_pad_query_default (pad, query);
|
|
break;
|
|
}
|
|
case GST_QUERY_SEEKING:
|
|
{
|
|
GstFormat fmt;
|
|
gboolean seekable = FALSE;
|
|
|
|
GST_DEBUG_OBJECT (parse, "seeking query");
|
|
|
|
gst_query_parse_seeking (query, &fmt, NULL, NULL, NULL);
|
|
|
|
if (fmt != GST_FORMAT_TIME) {
|
|
return gst_pad_query_default (pad, query);
|
|
}
|
|
|
|
seekable = klass->is_seekable (parse);
|
|
|
|
/* TODO: could this duration be calculated/converted if subclass
|
|
hasn't given it? */
|
|
gst_query_set_seeking (query, GST_FORMAT_TIME, seekable, 0,
|
|
(parse->priv->duration == -1) ?
|
|
GST_CLOCK_TIME_NONE : parse->priv->duration);
|
|
|
|
GST_DEBUG_OBJECT (parse, "seekable: %d", seekable);
|
|
res = TRUE;
|
|
break;
|
|
}
|
|
case GST_QUERY_FORMATS:
|
|
gst_query_set_formatsv (query, 3, fmtlist);
|
|
res = TRUE;
|
|
break;
|
|
|
|
case GST_QUERY_CONVERT:
|
|
{
|
|
GstFormat src_format, dest_format;
|
|
gint64 src_value, dest_value;
|
|
|
|
gst_query_parse_convert (query, &src_format, &src_value,
|
|
&dest_format, &dest_value);
|
|
|
|
/* FIXME: hm? doesn't make sense
|
|
* We require all those values to be given
|
|
if (src_format && src_value && dest_format && dest_value ) { */
|
|
res = klass->convert (parse, src_format, src_value,
|
|
dest_format, &dest_value);
|
|
if (res) {
|
|
gst_query_set_convert (query, src_format, src_value,
|
|
dest_format, dest_value);
|
|
}
|
|
/*} */
|
|
break;
|
|
}
|
|
default:
|
|
res = gst_pad_query_default (pad, query);
|
|
break;
|
|
}
|
|
return res;
|
|
}
|
|
|
|
|
|
/**
|
|
* gst_base_parse_handle_seek:
|
|
* @parse: #GstBaseParse.
|
|
* @event: #GstEvent.
|
|
*
|
|
* Returns: TRUE if seek succeeded.
|
|
*/
|
|
static gboolean
|
|
gst_base_parse_handle_seek (GstBaseParse * parse, GstEvent * event)
|
|
{
|
|
GstBaseParseClass *klass;
|
|
gdouble rate;
|
|
GstFormat format;
|
|
GstSeekFlags flags;
|
|
GstSeekType cur_type = GST_SEEK_TYPE_NONE, stop_type;
|
|
gboolean flush, update, res = TRUE;
|
|
gint64 cur, stop, seekpos;
|
|
GstSegment seeksegment = { 0, };
|
|
GstFormat dstformat;
|
|
|
|
klass = GST_BASE_PARSE_GET_CLASS (parse);
|
|
|
|
gst_event_parse_seek (event, &rate, &format, &flags,
|
|
&cur_type, &cur, &stop_type, &stop);
|
|
|
|
/* no negative rates yet */
|
|
if (rate < 0.0)
|
|
goto negative_rate;
|
|
|
|
if (cur_type != GST_SEEK_TYPE_SET)
|
|
goto wrong_type;
|
|
|
|
/* For any format other than TIME, see if upstream handles
|
|
* it directly or fail. For TIME, try upstream, but do it ourselves if
|
|
* it fails upstream */
|
|
if (format != GST_FORMAT_TIME) {
|
|
return gst_pad_push_event (parse->sinkpad, event);
|
|
} else {
|
|
gst_event_ref (event);
|
|
if (gst_pad_push_event (parse->sinkpad, event)) {
|
|
gst_event_unref (event);
|
|
return TRUE;
|
|
}
|
|
}
|
|
|
|
/* get flush flag */
|
|
flush = flags & GST_SEEK_FLAG_FLUSH;
|
|
|
|
dstformat = GST_FORMAT_BYTES;
|
|
if (!gst_pad_query_convert (parse->srcpad, format, cur, &dstformat, &seekpos)) {
|
|
GST_DEBUG_OBJECT (parse, "conversion failed");
|
|
return FALSE;
|
|
}
|
|
|
|
GST_DEBUG_OBJECT (parse, "seek position %lld in bytes: %lld", cur, seekpos);
|
|
|
|
if (parse->priv->pad_mode == GST_ACTIVATE_PULL) {
|
|
gint64 last_stop;
|
|
|
|
GST_DEBUG_OBJECT (parse, "seek in PULL mode");
|
|
|
|
if (flush) {
|
|
if (parse->srcpad) {
|
|
GST_DEBUG_OBJECT (parse, "sending flush start");
|
|
gst_pad_push_event (parse->srcpad, gst_event_new_flush_start ());
|
|
}
|
|
} else {
|
|
gst_pad_pause_task (parse->sinkpad);
|
|
}
|
|
|
|
/* we should now be able to grab the streaming thread because we stopped it
|
|
* with the above flush/pause code */
|
|
GST_PAD_STREAM_LOCK (parse->sinkpad);
|
|
|
|
/* save current position */
|
|
last_stop = parse->segment.last_stop;
|
|
GST_DEBUG_OBJECT (parse, "stopped streaming at %" G_GINT64_FORMAT,
|
|
last_stop);
|
|
|
|
/* copy segment, we need this because we still need the old
|
|
* segment when we close the current segment. */
|
|
memcpy (&seeksegment, &parse->segment, sizeof (GstSegment));
|
|
|
|
GST_DEBUG_OBJECT (parse, "configuring seek");
|
|
gst_segment_set_seek (&seeksegment, rate, format, flags,
|
|
cur_type, cur, stop_type, stop, &update);
|
|
|
|
/* figure out the last position we need to play. If it's configured (stop !=
|
|
* -1), use that, else we play until the total duration of the file */
|
|
if ((stop = seeksegment.stop) == -1)
|
|
stop = seeksegment.duration;
|
|
|
|
parse->priv->offset = seekpos;
|
|
|
|
/* prepare for streaming again */
|
|
if (flush) {
|
|
GST_DEBUG_OBJECT (parse, "sending flush stop");
|
|
gst_pad_push_event (parse->srcpad, gst_event_new_flush_stop ());
|
|
} else {
|
|
if (parse->close_segment)
|
|
gst_event_unref (parse->close_segment);
|
|
|
|
parse->close_segment = gst_event_new_new_segment (TRUE,
|
|
parse->segment.rate, parse->segment.format,
|
|
parse->segment.accum, parse->segment.last_stop, parse->segment.accum);
|
|
|
|
/* keep track of our last_stop */
|
|
seeksegment.accum = parse->segment.last_stop;
|
|
|
|
GST_DEBUG_OBJECT (parse, "Created close seg format %d, "
|
|
"start = %" GST_TIME_FORMAT ", stop = %" GST_TIME_FORMAT
|
|
", pos = %" GST_TIME_FORMAT, format,
|
|
GST_TIME_ARGS (parse->segment.accum),
|
|
GST_TIME_ARGS (parse->segment.last_stop),
|
|
GST_TIME_ARGS (parse->segment.accum));
|
|
}
|
|
|
|
memcpy (&parse->segment, &seeksegment, sizeof (GstSegment));
|
|
|
|
/* store the newsegment event so it can be sent from the streaming thread. */
|
|
if (parse->pending_segment)
|
|
gst_event_unref (parse->pending_segment);
|
|
|
|
/* This will be sent later in _loop() */
|
|
parse->pending_segment =
|
|
gst_event_new_new_segment (FALSE, parse->segment.rate,
|
|
parse->segment.format,
|
|
parse->segment.last_stop, stop, parse->segment.last_stop);
|
|
|
|
GST_DEBUG_OBJECT (parse, "Created newseg format %d, "
|
|
"start = %" GST_TIME_FORMAT ", stop = %" GST_TIME_FORMAT
|
|
", pos = %" GST_TIME_FORMAT, format,
|
|
GST_TIME_ARGS (parse->segment.last_stop),
|
|
GST_TIME_ARGS (stop), GST_TIME_ARGS (parse->segment.last_stop));
|
|
|
|
/* mark discont if we are going to stream from another position. */
|
|
if (last_stop != parse->segment.last_stop) {
|
|
GST_DEBUG_OBJECT (parse,
|
|
"mark DISCONT, we did a seek to another position");
|
|
parse->priv->discont = TRUE;
|
|
}
|
|
|
|
/* Start streaming thread if paused */
|
|
gst_pad_start_task (parse->sinkpad,
|
|
(GstTaskFunction) gst_base_parse_loop, parse->sinkpad);
|
|
|
|
GST_PAD_STREAM_UNLOCK (parse->sinkpad);
|
|
} else {
|
|
GstEvent *new_event;
|
|
/* The only thing we need to do in PUSH-mode is to send the
|
|
seek event (in bytes) to upstream. Segment / flush handling happens
|
|
in corresponding src event handlers */
|
|
GST_DEBUG_OBJECT (parse, "seek in PUSH mode");
|
|
new_event = gst_event_new_seek (rate, GST_FORMAT_BYTES, flush,
|
|
GST_SEEK_TYPE_SET, seekpos, stop_type, stop);
|
|
|
|
res = gst_pad_push_event (parse->sinkpad, new_event);
|
|
}
|
|
|
|
done:
|
|
return res;
|
|
|
|
/* ERRORS */
|
|
negative_rate:
|
|
{
|
|
GST_DEBUG_OBJECT (parse, "negative playback rates are not supported yet.");
|
|
res = FALSE;
|
|
goto done;
|
|
}
|
|
wrong_type:
|
|
{
|
|
GST_DEBUG_OBJECT (parse, "unsupported seek type.");
|
|
res = FALSE;
|
|
goto done;
|
|
}
|
|
}
|
|
|
|
|
|
/**
|
|
* gst_base_parse_sink_setcaps:
|
|
* @pad: #GstPad.
|
|
* @caps: #GstCaps.
|
|
*
|
|
* Returns: TRUE if caps were accepted.
|
|
*/
|
|
static gboolean
|
|
gst_base_parse_sink_setcaps (GstPad * pad, GstCaps * caps)
|
|
{
|
|
GstBaseParse *parse;
|
|
GstBaseParseClass *klass;
|
|
gboolean res = TRUE;
|
|
|
|
parse = GST_BASE_PARSE (GST_PAD_PARENT (pad));
|
|
klass = GST_BASE_PARSE_GET_CLASS (parse);
|
|
|
|
GST_DEBUG_OBJECT (parse, "caps: %" GST_PTR_FORMAT, caps);
|
|
|
|
if (klass->set_sink_caps)
|
|
res = klass->set_sink_caps (parse, caps);
|
|
|
|
parse->negotiated = res;
|
|
return res && gst_pad_set_caps (pad, caps);
|
|
}
|