blob: 50499a4b1452bb29d33fbbd09c4b75a714d8a296 [file] [log] [blame]
/* GStreamer
* Copyright (C) 2008 Nokia Corporation. All rights reserved.
* Contact: Stefan Kost <stefan.kost@nokia.com>
* Copyright (C) 2008 Sebastian Dröge <sebastian.droege@collabora.co.uk>.
* Copyright (C) 2011, Hewlett-Packard Development Company, L.P.
* Author: Sebastian Dröge <sebastian.droege@collabora.co.uk>, Collabora Ltd.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
/**
* SECTION:gstbaseparse
* @short_description: Base class for stream parsers
* @see_also: #GstBaseTransform
*
* This base class is for parser elements that process data and splits it
* into separate audio/video/whatever frames.
*
* It provides for:
* <itemizedlist>
* <listitem><para>provides one sink pad and one source pad</para></listitem>
* <listitem><para>handles state changes</para></listitem>
* <listitem><para>can operate in pull mode or push mode</para></listitem>
* <listitem><para>handles seeking in both modes</para></listitem>
* <listitem><para>handles events (SEGMENT/EOS/FLUSH)</para></listitem>
* <listitem><para>
* handles queries (POSITION/DURATION/SEEKING/FORMAT/CONVERT)
* </para></listitem>
* <listitem><para>handles flushing</para></listitem>
* </itemizedlist>
*
* The purpose of this base class is to provide the basic functionality of
* a parser and share a lot of rather complex code.
*
* Description of the parsing mechanism:
* <orderedlist>
* <listitem>
* <itemizedlist><title>Set-up phase</title>
* <listitem><para>
* #GstBaseParse calls @start to inform subclass that data processing is
* about to start now.
* </para></listitem>
* <listitem><para>
* #GstBaseParse class calls @set_sink_caps to inform the subclass about
* incoming sinkpad caps. Subclass could already set the srcpad caps
* accordingly, but this might be delayed until calling
* gst_base_parse_finish_frame() with a non-queued frame.
* </para></listitem>
* <listitem><para>
* At least at this point subclass needs to tell the #GstBaseParse class
* how big data chunks it wants to receive (min_frame_size). It can do
* this with gst_base_parse_set_min_frame_size().
* </para></listitem>
* <listitem><para>
* #GstBaseParse class sets up appropriate data passing mode (pull/push)
* and starts to process the data.
* </para></listitem>
* </itemizedlist>
* </listitem>
* <listitem>
* <itemizedlist>
* <title>Parsing phase</title>
* <listitem><para>
* #GstBaseParse gathers at least min_frame_size bytes of data either
* by pulling it from upstream or collecting buffers in an internal
* #GstAdapter.
* </para></listitem>
* <listitem><para>
* A buffer of (at least) min_frame_size bytes is passed to subclass with
* @handle_frame. Subclass checks the contents and can optionally
* return GST_FLOW_OK along with an amount of data to be skipped to find
* a valid frame (which will result in a subsequent DISCONT).
* If, otherwise, the buffer does not hold a complete frame,
* @handle_frame can merely return and will be called again when additional
* data is available. In push mode this amounts to an
* additional input buffer (thus minimal additional latency), in pull mode
* this amounts to some arbitrary reasonable buffer size increase.
* Of course, gst_base_parse_set_min_frame_size() could also be used if a
* very specific known amount of additional data is required.
* If, however, the buffer holds a complete valid frame, it can pass
* the size of this frame to gst_base_parse_finish_frame().
* If acting as a converter, it can also merely indicate consumed input data
* while simultaneously providing custom output data.
* Note that baseclass performs some processing (such as tracking
* overall consumed data rate versus duration) for each finished frame,
* but other state is only updated upon each call to @handle_frame
* (such as tracking upstream input timestamp).
* </para><para>
* Subclass is also responsible for setting the buffer metadata
* (e.g. buffer timestamp and duration, or keyframe if applicable).
* (although the latter can also be done by #GstBaseParse if it is
* appropriately configured, see below). Frame is provided with
* timestamp derived from upstream (as much as generally possible),
* duration obtained from configuration (see below), and offset
* if meaningful (in pull mode).
* </para><para>
* Note that @check_valid_frame might receive any small
* amount of input data when leftover data is being drained (e.g. at EOS).
* </para></listitem>
* <listitem><para>
* As part of finish frame processing,
* just prior to actually pushing the buffer in question,
* it is passed to @pre_push_frame which gives subclass yet one
* last chance to examine buffer metadata, or to send some custom (tag)
* events, or to perform custom (segment) filtering.
* </para></listitem>
* <listitem><para>
* During the parsing process #GstBaseParseClass will handle both srcpad
* and sinkpad events. They will be passed to subclass if @event or
* @src_event callbacks have been provided.
* </para></listitem>
* </itemizedlist>
* </listitem>
* <listitem>
* <itemizedlist><title>Shutdown phase</title>
* <listitem><para>
* #GstBaseParse class calls @stop to inform the subclass that data
* parsing will be stopped.
* </para></listitem>
* </itemizedlist>
* </listitem>
* </orderedlist>
*
* Subclass is responsible for providing pad template caps for
* source and sink pads. The pads need to be named "sink" and "src". It also
* needs to set the fixed caps on srcpad, when the format is ensured (e.g.
* when base class calls subclass' @set_sink_caps function).
*
* This base class uses %GST_FORMAT_DEFAULT as a meaning of frames. So,
* subclass conversion routine needs to know that conversion from
* %GST_FORMAT_TIME to %GST_FORMAT_DEFAULT must return the
* frame number that can be found from the given byte position.
*
* #GstBaseParse uses subclasses conversion methods also for seeking (or
* otherwise uses its own default one, see also below).
*
* Subclass @start and @stop functions will be called to inform the beginning
* and end of data processing.
*
* Things that subclass need to take care of:
* <itemizedlist>
* <listitem><para>Provide pad templates</para></listitem>
* <listitem><para>
* Fixate the source pad caps when appropriate
* </para></listitem>
* <listitem><para>
* Inform base class how big data chunks should be retrieved. This is
* done with gst_base_parse_set_min_frame_size() function.
* </para></listitem>
* <listitem><para>
* Examine data chunks passed to subclass with @handle_frame and pass
* proper frame(s) to gst_base_parse_finish_frame(), and setting src pad
* caps and timestamps on frame.
* </para></listitem>
* <listitem><para>Provide conversion functions</para></listitem>
* <listitem><para>
* Update the duration information with gst_base_parse_set_duration()
* </para></listitem>
* <listitem><para>
* Optionally passthrough using gst_base_parse_set_passthrough()
* </para></listitem>
* <listitem><para>
* Configure various baseparse parameters using
* gst_base_parse_set_average_bitrate(), gst_base_parse_set_syncable()
* and gst_base_parse_set_frame_rate().
* </para></listitem>
* <listitem><para>
* In particular, if subclass is unable to determine a duration, but
* parsing (or specs) yields a frames per seconds rate, then this can be
* provided to #GstBaseParse to enable it to cater for
* buffer time metadata (which will be taken from upstream as much as
* possible). Internally keeping track of frame durations and respective
* sizes that have been pushed provides #GstBaseParse with an estimated
* bitrate. A default @convert (used if not overridden) will then use these
* rates to perform obvious conversions. These rates are also used to
* update (estimated) duration at regular frame intervals.
* </para></listitem>
* </itemizedlist>
*
*/
/* TODO:
* - In push mode provide a queue of adapter-"queued" buffers for upstream
* buffer metadata
* - Queue buffers/events until caps are set
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <stdlib.h>
#include <string.h>
#include <gst/base/gstadapter.h>
#include "gstbaseparse.h"
/* FIXME: get rid of old GstIndex code */
#include "gstindex.h"
#include "gstindex.c"
#include "gstmemindex.c"
#define GST_BASE_PARSE_FRAME_PRIVATE_FLAG_NOALLOC (1 << 0)
#define MIN_FRAMES_TO_POST_BITRATE 10
#define TARGET_DIFFERENCE (20 * GST_SECOND)
#define MAX_INDEX_ENTRIES 4096
#define UPDATE_THRESHOLD 2
#define ABSDIFF(a,b) (((a) > (b)) ? ((a) - (b)) : ((b) - (a)))
GST_DEBUG_CATEGORY_STATIC (gst_base_parse_debug);
#define GST_CAT_DEFAULT gst_base_parse_debug
/* Supported formats */
static const GstFormat fmtlist[] = {
GST_FORMAT_DEFAULT,
GST_FORMAT_BYTES,
GST_FORMAT_TIME,
GST_FORMAT_UNDEFINED
};
#define GST_BASE_PARSE_GET_PRIVATE(obj) \
(G_TYPE_INSTANCE_GET_PRIVATE ((obj), GST_TYPE_BASE_PARSE, GstBaseParsePrivate))
struct _GstBaseParsePrivate
{
GstPadMode pad_mode;
GstAdapter *adapter;
gint64 duration;
GstFormat duration_fmt;
gint64 estimated_duration;
gint64 estimated_drift;
guint min_frame_size;
gboolean disable_passthrough;
gboolean passthrough;
gboolean pts_interpolate;
gboolean infer_ts;
gboolean syncable;
gboolean has_timing_info;
guint fps_num, fps_den;
gint update_interval;
guint bitrate;
guint lead_in, lead_out;
GstClockTime lead_in_ts, lead_out_ts;
GstClockTime min_latency, max_latency;
gboolean discont;
gboolean flushing;
gboolean drain;
gboolean saw_gaps;
gint64 offset;
gint64 sync_offset;
GstClockTime next_pts;
GstClockTime next_dts;
GstClockTime prev_pts;
GstClockTime prev_dts;
gboolean prev_dts_from_pts;
GstClockTime frame_duration;
gboolean seen_keyframe;
gboolean is_video;
gint flushed;
guint64 framecount;
guint64 bytecount;
guint64 data_bytecount;
guint64 acc_duration;
GstClockTime first_frame_pts;
GstClockTime first_frame_dts;
gint64 first_frame_offset;
gboolean post_min_bitrate;
gboolean post_avg_bitrate;
gboolean post_max_bitrate;
guint min_bitrate;
guint avg_bitrate;
guint max_bitrate;
guint posted_avg_bitrate;
/* frames/buffers that are queued and ready to go on OK */
GQueue queued_frames;
GstBuffer *cache;
/* index entry storage, either ours or provided */
GstIndex *index;
gint index_id;
gboolean own_index;
GMutex index_lock;
/* seek table entries only maintained if upstream is BYTE seekable */
gboolean upstream_seekable;
gboolean upstream_has_duration;
gint64 upstream_size;
GstFormat upstream_format;
/* minimum distance between two index entries */
GstClockTimeDiff idx_interval;
guint64 idx_byte_interval;
/* ts and offset of last entry added */
GstClockTime index_last_ts;
gint64 index_last_offset;
gboolean index_last_valid;
/* timestamps currently produced are accurate, e.g. started from 0 onwards */
gboolean exact_position;
/* seek events are temporarily kept to match them with newsegments */
GSList *pending_seeks;
/* reverse playback */
GSList *buffers_pending;
GSList *buffers_head;
GSList *buffers_queued;
GSList *buffers_send;
GstClockTime last_pts;
GstClockTime last_dts;
gint64 last_offset;
/* Pending serialized events */
GList *pending_events;
/* If baseparse has checked the caps to identify if it is
* handling video or audio */
gboolean checked_media;
/* offset of last parsed frame/data */
gint64 prev_offset;
/* force a new frame, regardless of offset */
gboolean new_frame;
/* whether we are merely scanning for a frame */
gboolean scanning;
/* ... and resulting frame, if any */
GstBaseParseFrame *scanned_frame;
/* TRUE if we're still detecting the format, i.e.
* if ::detect() is still called for future buffers */
gboolean detecting;
GList *detect_buffers;
guint detect_buffers_size;
/* True when no buffers have been received yet */
gboolean first_buffer;
/* if TRUE, a STREAM_START event needs to be pushed */
gboolean push_stream_start;
/* When we need to skip more data than we have currently */
guint skip;
/* Tag handling (stream tags only, global tags are passed through as-is) */
GstTagList *upstream_tags;
GstTagList *parser_tags;
GstTagMergeMode parser_tags_merge_mode;
gboolean tags_changed;
};
typedef struct _GstBaseParseSeek
{
GstSegment segment;
gboolean accurate;
gint64 offset;
GstClockTime start_ts;
} GstBaseParseSeek;
#define DEFAULT_DISABLE_PASSTHROUGH FALSE
enum
{
PROP_0,
PROP_DISABLE_PASSTHROUGH,
PROP_LAST
};
#define GST_BASE_PARSE_INDEX_LOCK(parse) \
g_mutex_lock (&parse->priv->index_lock);
#define GST_BASE_PARSE_INDEX_UNLOCK(parse) \
g_mutex_unlock (&parse->priv->index_lock);
static GstElementClass *parent_class = NULL;
static void gst_base_parse_class_init (GstBaseParseClass * klass);
static void gst_base_parse_init (GstBaseParse * parse,
GstBaseParseClass * klass);
GType
gst_base_parse_get_type (void)
{
static volatile gsize base_parse_type = 0;
if (g_once_init_enter (&base_parse_type)) {
static const GTypeInfo base_parse_info = {
sizeof (GstBaseParseClass),
(GBaseInitFunc) NULL,
(GBaseFinalizeFunc) NULL,
(GClassInitFunc) gst_base_parse_class_init,
NULL,
NULL,
sizeof (GstBaseParse),
0,
(GInstanceInitFunc) gst_base_parse_init,
};
GType _type;
_type = g_type_register_static (GST_TYPE_ELEMENT,
"GstBaseParse", &base_parse_info, G_TYPE_FLAG_ABSTRACT);
g_once_init_leave (&base_parse_type, _type);
}
return (GType) base_parse_type;
}
static void gst_base_parse_finalize (GObject * object);
static GstStateChangeReturn gst_base_parse_change_state (GstElement * element,
GstStateChange transition);
static void gst_base_parse_reset (GstBaseParse * parse);
#if 0
static void gst_base_parse_set_index (GstElement * element, GstIndex * index);
static GstIndex *gst_base_parse_get_index (GstElement * element);
#endif
static gboolean gst_base_parse_sink_activate (GstPad * sinkpad,
GstObject * parent);
static gboolean gst_base_parse_sink_activate_mode (GstPad * pad,
GstObject * parent, GstPadMode mode, gboolean active);
static gboolean gst_base_parse_handle_seek (GstBaseParse * parse,
GstEvent * event);
static void gst_base_parse_set_upstream_tags (GstBaseParse * parse,
GstTagList * taglist);
static void gst_base_parse_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec);
static void gst_base_parse_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec);
static gboolean gst_base_parse_src_event (GstPad * pad, GstObject * parent,
GstEvent * event);
static gboolean gst_base_parse_src_query (GstPad * pad, GstObject * parent,
GstQuery * query);
static gboolean gst_base_parse_sink_event (GstPad * pad, GstObject * parent,
GstEvent * event);
static gboolean gst_base_parse_sink_query (GstPad * pad, GstObject * parent,
GstQuery * query);
static GstFlowReturn gst_base_parse_chain (GstPad * pad, GstObject * parent,
GstBuffer * buffer);
static void gst_base_parse_loop (GstPad * pad);
static GstFlowReturn gst_base_parse_parse_frame (GstBaseParse * parse,
GstBaseParseFrame * frame);
static gboolean gst_base_parse_sink_event_default (GstBaseParse * parse,
GstEvent * event);
static gboolean gst_base_parse_src_event_default (GstBaseParse * parse,
GstEvent * event);
static gboolean gst_base_parse_sink_query_default (GstBaseParse * parse,
GstQuery * query);
static gboolean gst_base_parse_src_query_default (GstBaseParse * parse,
GstQuery * query);
static void gst_base_parse_drain (GstBaseParse * parse);
static gint64 gst_base_parse_find_offset (GstBaseParse * parse,
GstClockTime time, gboolean before, GstClockTime * _ts);
static GstFlowReturn gst_base_parse_locate_time (GstBaseParse * parse,
GstClockTime * _time, gint64 * _offset);
static GstFlowReturn gst_base_parse_start_fragment (GstBaseParse * parse);
static GstFlowReturn gst_base_parse_finish_fragment (GstBaseParse * parse,
gboolean prev_head);
static GstFlowReturn gst_base_parse_send_buffers (GstBaseParse * parse);
static inline GstFlowReturn gst_base_parse_check_sync (GstBaseParse * parse);
static gboolean gst_base_parse_is_seekable (GstBaseParse * parse);
static void gst_base_parse_push_pending_events (GstBaseParse * parse);
static void
gst_base_parse_clear_queues (GstBaseParse * parse)
{
g_slist_foreach (parse->priv->buffers_queued, (GFunc) gst_buffer_unref, NULL);
g_slist_free (parse->priv->buffers_queued);
parse->priv->buffers_queued = NULL;
g_slist_foreach (parse->priv->buffers_pending, (GFunc) gst_buffer_unref,
NULL);
g_slist_free (parse->priv->buffers_pending);
parse->priv->buffers_pending = NULL;
g_slist_foreach (parse->priv->buffers_head, (GFunc) gst_buffer_unref, NULL);
g_slist_free (parse->priv->buffers_head);
parse->priv->buffers_head = NULL;
g_slist_foreach (parse->priv->buffers_send, (GFunc) gst_buffer_unref, NULL);
g_slist_free (parse->priv->buffers_send);
parse->priv->buffers_send = NULL;
g_list_foreach (parse->priv->detect_buffers, (GFunc) gst_buffer_unref, NULL);
g_list_free (parse->priv->detect_buffers);
parse->priv->detect_buffers = NULL;
parse->priv->detect_buffers_size = 0;
g_queue_foreach (&parse->priv->queued_frames,
(GFunc) gst_base_parse_frame_free, NULL);
g_queue_clear (&parse->priv->queued_frames);
gst_buffer_replace (&parse->priv->cache, NULL);
g_list_foreach (parse->priv->pending_events, (GFunc) gst_event_unref, NULL);
g_list_free (parse->priv->pending_events);
parse->priv->pending_events = NULL;
parse->priv->checked_media = FALSE;
}
static void
gst_base_parse_finalize (GObject * object)
{
GstBaseParse *parse = GST_BASE_PARSE (object);
g_object_unref (parse->priv->adapter);
if (parse->priv->index) {
gst_object_unref (parse->priv->index);
parse->priv->index = NULL;
}
g_mutex_clear (&parse->priv->index_lock);
gst_base_parse_clear_queues (parse);
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static void
gst_base_parse_class_init (GstBaseParseClass * klass)
{
GObjectClass *gobject_class;
GstElementClass *gstelement_class;
gobject_class = G_OBJECT_CLASS (klass);
g_type_class_add_private (klass, sizeof (GstBaseParsePrivate));
parent_class = g_type_class_peek_parent (klass);
gobject_class->finalize = GST_DEBUG_FUNCPTR (gst_base_parse_finalize);
gobject_class->set_property = GST_DEBUG_FUNCPTR (gst_base_parse_set_property);
gobject_class->get_property = GST_DEBUG_FUNCPTR (gst_base_parse_get_property);
/**
* GstBaseParse:disable-passthrough:
*
* If set to %TRUE, baseparse will unconditionally force parsing of the
* incoming data. This can be required in the rare cases where the incoming
* side-data (caps, pts, dts, ...) is not trusted by the user and wants to
* force validation and parsing of the incoming data.
* If set to %FALSE, decision of whether to parse the data or not is up to
* the implementation (standard behaviour).
*/
g_object_class_install_property (gobject_class, PROP_DISABLE_PASSTHROUGH,
g_param_spec_boolean ("disable-passthrough", "Disable passthrough",
"Force processing (disables passthrough)",
DEFAULT_DISABLE_PASSTHROUGH,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
gstelement_class = (GstElementClass *) klass;
gstelement_class->change_state =
GST_DEBUG_FUNCPTR (gst_base_parse_change_state);
#if 0
gstelement_class->set_index = GST_DEBUG_FUNCPTR (gst_base_parse_set_index);
gstelement_class->get_index = GST_DEBUG_FUNCPTR (gst_base_parse_get_index);
#endif
/* Default handlers */
klass->sink_event = gst_base_parse_sink_event_default;
klass->src_event = gst_base_parse_src_event_default;
klass->sink_query = gst_base_parse_sink_query_default;
klass->src_query = gst_base_parse_src_query_default;
klass->convert = gst_base_parse_convert_default;
GST_DEBUG_CATEGORY_INIT (gst_base_parse_debug, "baseparse", 0,
"baseparse element");
}
static void
gst_base_parse_init (GstBaseParse * parse, GstBaseParseClass * bclass)
{
GstPadTemplate *pad_template;
GST_DEBUG_OBJECT (parse, "gst_base_parse_init");
parse->priv = GST_BASE_PARSE_GET_PRIVATE (parse);
pad_template =
gst_element_class_get_pad_template (GST_ELEMENT_CLASS (bclass), "sink");
g_return_if_fail (pad_template != NULL);
parse->sinkpad = gst_pad_new_from_template (pad_template, "sink");
gst_pad_set_event_function (parse->sinkpad,
GST_DEBUG_FUNCPTR (gst_base_parse_sink_event));
gst_pad_set_query_function (parse->sinkpad,
GST_DEBUG_FUNCPTR (gst_base_parse_sink_query));
gst_pad_set_chain_function (parse->sinkpad,
GST_DEBUG_FUNCPTR (gst_base_parse_chain));
gst_pad_set_activate_function (parse->sinkpad,
GST_DEBUG_FUNCPTR (gst_base_parse_sink_activate));
gst_pad_set_activatemode_function (parse->sinkpad,
GST_DEBUG_FUNCPTR (gst_base_parse_sink_activate_mode));
GST_PAD_SET_PROXY_ALLOCATION (parse->sinkpad);
gst_element_add_pad (GST_ELEMENT (parse), parse->sinkpad);
GST_DEBUG_OBJECT (parse, "sinkpad created");
pad_template =
gst_element_class_get_pad_template (GST_ELEMENT_CLASS (bclass), "src");
g_return_if_fail (pad_template != NULL);
parse->srcpad = gst_pad_new_from_template (pad_template, "src");
gst_pad_set_event_function (parse->srcpad,
GST_DEBUG_FUNCPTR (gst_base_parse_src_event));
gst_pad_set_query_function (parse->srcpad,
GST_DEBUG_FUNCPTR (gst_base_parse_src_query));
gst_pad_use_fixed_caps (parse->srcpad);
gst_element_add_pad (GST_ELEMENT (parse), parse->srcpad);
GST_DEBUG_OBJECT (parse, "src created");
g_queue_init (&parse->priv->queued_frames);
parse->priv->adapter = gst_adapter_new ();
parse->priv->pad_mode = GST_PAD_MODE_NONE;
g_mutex_init (&parse->priv->index_lock);
/* init state */
gst_base_parse_reset (parse);
GST_DEBUG_OBJECT (parse, "init ok");
GST_OBJECT_FLAG_SET (parse, GST_ELEMENT_FLAG_INDEXABLE);
parse->priv->upstream_tags = NULL;
parse->priv->parser_tags = NULL;
parse->priv->parser_tags_merge_mode = GST_TAG_MERGE_APPEND;
}
static void
gst_base_parse_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
GstBaseParse *parse = GST_BASE_PARSE (object);
switch (prop_id) {
case PROP_DISABLE_PASSTHROUGH:
parse->priv->disable_passthrough = g_value_get_boolean (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_base_parse_get_property (GObject * object, guint prop_id, GValue * value,
GParamSpec * pspec)
{
GstBaseParse *parse = GST_BASE_PARSE (object);
switch (prop_id) {
case PROP_DISABLE_PASSTHROUGH:
g_value_set_boolean (value, parse->priv->disable_passthrough);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static GstBaseParseFrame *
gst_base_parse_frame_copy (GstBaseParseFrame * frame)
{
GstBaseParseFrame *copy;
copy = g_slice_dup (GstBaseParseFrame, frame);
copy->buffer = gst_buffer_ref (frame->buffer);
copy->_private_flags &= ~GST_BASE_PARSE_FRAME_PRIVATE_FLAG_NOALLOC;
GST_TRACE ("copied frame %p -> %p", frame, copy);
return copy;
}
void
gst_base_parse_frame_free (GstBaseParseFrame * frame)
{
GST_TRACE ("freeing frame %p", frame);
if (frame->buffer) {
gst_buffer_unref (frame->buffer);
frame->buffer = NULL;
}
if (!(frame->_private_flags & GST_BASE_PARSE_FRAME_PRIVATE_FLAG_NOALLOC)) {
g_slice_free (GstBaseParseFrame, frame);
} else {
memset (frame, 0, sizeof (*frame));
}
}
G_DEFINE_BOXED_TYPE (GstBaseParseFrame, gst_base_parse_frame,
(GBoxedCopyFunc) gst_base_parse_frame_copy,
(GBoxedFreeFunc) gst_base_parse_frame_free);
/**
* gst_base_parse_frame_init:
* @frame: #GstBaseParseFrame.
*
* Sets a #GstBaseParseFrame to initial state. Currently this means
* all public fields are zero-ed and a private flag is set to make
* sure gst_base_parse_frame_free() only frees the contents but not
* the actual frame. Use this function to initialise a #GstBaseParseFrame
* allocated on the stack.
*/
void
gst_base_parse_frame_init (GstBaseParseFrame * frame)
{
memset (frame, 0, sizeof (GstBaseParseFrame));
frame->_private_flags = GST_BASE_PARSE_FRAME_PRIVATE_FLAG_NOALLOC;
GST_TRACE ("inited frame %p", frame);
}
/**
* gst_base_parse_frame_new:
* @buffer: (transfer none): a #GstBuffer
* @flags: the flags
* @overhead: number of bytes in this frame which should be counted as
* metadata overhead, ie. not used to calculate the average bitrate.
* Set to -1 to mark the entire frame as metadata. If in doubt, set to 0.
*
* Allocates a new #GstBaseParseFrame. This function is mainly for bindings,
* elements written in C should usually allocate the frame on the stack and
* then use gst_base_parse_frame_init() to initialise it.
*
* Returns: a newly-allocated #GstBaseParseFrame. Free with
* gst_base_parse_frame_free() when no longer needed.
*/
GstBaseParseFrame *
gst_base_parse_frame_new (GstBuffer * buffer, GstBaseParseFrameFlags flags,
gint overhead)
{
GstBaseParseFrame *frame;
frame = g_slice_new0 (GstBaseParseFrame);
frame->buffer = gst_buffer_ref (buffer);
GST_TRACE ("created frame %p", frame);
return frame;
}
static inline void
gst_base_parse_update_flags (GstBaseParse * parse)
{
parse->flags = 0;
/* set flags one by one for clarity */
if (G_UNLIKELY (parse->priv->drain))
parse->flags |= GST_BASE_PARSE_FLAG_DRAINING;
/* losing sync is pretty much a discont (and vice versa), no ? */
if (G_UNLIKELY (parse->priv->discont))
parse->flags |= GST_BASE_PARSE_FLAG_LOST_SYNC;
}
static inline void
gst_base_parse_update_frame (GstBaseParse * parse, GstBaseParseFrame * frame)
{
if (G_UNLIKELY (parse->priv->discont)) {
GST_DEBUG_OBJECT (parse, "marking DISCONT");
GST_BUFFER_FLAG_SET (frame->buffer, GST_BUFFER_FLAG_DISCONT);
} else {
GST_BUFFER_FLAG_UNSET (frame->buffer, GST_BUFFER_FLAG_DISCONT);
}
if (parse->priv->prev_offset != parse->priv->offset || parse->priv->new_frame) {
GST_LOG_OBJECT (parse, "marking as new frame");
frame->flags |= GST_BASE_PARSE_FRAME_FLAG_NEW_FRAME;
}
frame->offset = parse->priv->prev_offset = parse->priv->offset;
}
static void
gst_base_parse_reset (GstBaseParse * parse)
{
GST_OBJECT_LOCK (parse);
gst_segment_init (&parse->segment, GST_FORMAT_TIME);
parse->priv->duration = -1;
parse->priv->min_frame_size = 1;
parse->priv->discont = TRUE;
parse->priv->flushing = FALSE;
parse->priv->saw_gaps = FALSE;
parse->priv->offset = 0;
parse->priv->sync_offset = 0;
parse->priv->update_interval = -1;
parse->priv->fps_num = parse->priv->fps_den = 0;
parse->priv->frame_duration = GST_CLOCK_TIME_NONE;
parse->priv->lead_in = parse->priv->lead_out = 0;
parse->priv->lead_in_ts = parse->priv->lead_out_ts = 0;
parse->priv->bitrate = 0;
parse->priv->framecount = 0;
parse->priv->bytecount = 0;
parse->priv->acc_duration = 0;
parse->priv->first_frame_pts = GST_CLOCK_TIME_NONE;
parse->priv->first_frame_dts = GST_CLOCK_TIME_NONE;
parse->priv->first_frame_offset = -1;
parse->priv->estimated_duration = -1;
parse->priv->estimated_drift = 0;
parse->priv->next_pts = GST_CLOCK_TIME_NONE;
parse->priv->next_dts = 0;
parse->priv->syncable = TRUE;
parse->priv->disable_passthrough = DEFAULT_DISABLE_PASSTHROUGH;
parse->priv->passthrough = FALSE;
parse->priv->pts_interpolate = TRUE;
parse->priv->infer_ts = TRUE;
parse->priv->has_timing_info = FALSE;
parse->priv->min_bitrate = G_MAXUINT;
parse->priv->max_bitrate = 0;
parse->priv->avg_bitrate = 0;
parse->priv->posted_avg_bitrate = 0;
parse->priv->index_last_ts = GST_CLOCK_TIME_NONE;
parse->priv->index_last_offset = -1;
parse->priv->index_last_valid = TRUE;
parse->priv->upstream_seekable = FALSE;
parse->priv->upstream_size = 0;
parse->priv->upstream_has_duration = FALSE;
parse->priv->upstream_format = GST_FORMAT_UNDEFINED;
parse->priv->idx_interval = 0;
parse->priv->idx_byte_interval = 0;
parse->priv->exact_position = TRUE;
parse->priv->seen_keyframe = FALSE;
parse->priv->checked_media = FALSE;
parse->priv->last_dts = GST_CLOCK_TIME_NONE;
parse->priv->last_pts = GST_CLOCK_TIME_NONE;
parse->priv->last_offset = 0;
parse->priv->skip = 0;
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;
}
g_slist_foreach (parse->priv->pending_seeks, (GFunc) g_free, NULL);
g_slist_free (parse->priv->pending_seeks);
parse->priv->pending_seeks = NULL;
if (parse->priv->adapter)
gst_adapter_clear (parse->priv->adapter);
gst_base_parse_set_upstream_tags (parse, NULL);
if (parse->priv->parser_tags) {
gst_tag_list_unref (parse->priv->parser_tags);
parse->priv->parser_tags = NULL;
}
parse->priv->parser_tags_merge_mode = GST_TAG_MERGE_APPEND;
parse->priv->new_frame = TRUE;
parse->priv->first_buffer = TRUE;
g_list_foreach (parse->priv->detect_buffers, (GFunc) gst_buffer_unref, NULL);
g_list_free (parse->priv->detect_buffers);
parse->priv->detect_buffers = NULL;
parse->priv->detect_buffers_size = 0;
GST_OBJECT_UNLOCK (parse);
}
static gboolean
gst_base_parse_check_bitrate_tag (GstBaseParse * parse, const gchar * tag)
{
gboolean got_tag = FALSE;
guint n = 0;
if (parse->priv->upstream_tags != NULL)
got_tag = gst_tag_list_get_uint (parse->priv->upstream_tags, tag, &n);
if (!got_tag && parse->priv->parser_tags != NULL)
got_tag = gst_tag_list_get_uint (parse->priv->parser_tags, tag, &n);
return got_tag;
}
/* check if upstream or subclass tags contain bitrates already */
static void
gst_base_parse_check_bitrate_tags (GstBaseParse * parse)
{
parse->priv->post_min_bitrate =
!gst_base_parse_check_bitrate_tag (parse, GST_TAG_MINIMUM_BITRATE);
parse->priv->post_avg_bitrate =
!gst_base_parse_check_bitrate_tag (parse, GST_TAG_BITRATE);
parse->priv->post_max_bitrate =
!gst_base_parse_check_bitrate_tag (parse, GST_TAG_MAXIMUM_BITRATE);
}
/* Queues new tag event with the current combined state of the stream tags
* (i.e. upstream tags merged with subclass tags and current baseparse tags) */
static void
gst_base_parse_queue_tag_event_update (GstBaseParse * parse)
{
GstTagList *merged_tags;
GST_LOG_OBJECT (parse, "upstream : %" GST_PTR_FORMAT,
parse->priv->upstream_tags);
GST_LOG_OBJECT (parse, "parser : %" GST_PTR_FORMAT,
parse->priv->parser_tags);
GST_LOG_OBJECT (parse, "mode : %d", parse->priv->parser_tags_merge_mode);
merged_tags =
gst_tag_list_merge (parse->priv->upstream_tags, parse->priv->parser_tags,
parse->priv->parser_tags_merge_mode);
GST_DEBUG_OBJECT (parse, "merged : %" GST_PTR_FORMAT, merged_tags);
if (merged_tags == NULL)
return;
if (gst_tag_list_is_empty (merged_tags)) {
gst_tag_list_unref (merged_tags);
return;
}
/* only add bitrate tags to non-empty taglists for now, and only if neither
* upstream tags nor the subclass sets the bitrate tag in question already */
if (parse->priv->min_bitrate != G_MAXUINT && parse->priv->post_min_bitrate) {
GST_LOG_OBJECT (parse, "adding min bitrate %u", parse->priv->min_bitrate);
gst_tag_list_add (merged_tags, GST_TAG_MERGE_KEEP, GST_TAG_MINIMUM_BITRATE,
parse->priv->min_bitrate, NULL);
}
if (parse->priv->max_bitrate != 0 && parse->priv->post_max_bitrate) {
GST_LOG_OBJECT (parse, "adding max bitrate %u", parse->priv->max_bitrate);
gst_tag_list_add (merged_tags, GST_TAG_MERGE_KEEP, GST_TAG_MAXIMUM_BITRATE,
parse->priv->max_bitrate, NULL);
}
if (parse->priv->avg_bitrate != 0 && parse->priv->post_avg_bitrate) {
parse->priv->posted_avg_bitrate = parse->priv->avg_bitrate;
GST_LOG_OBJECT (parse, "adding avg bitrate %u", parse->priv->avg_bitrate);
gst_tag_list_add (merged_tags, GST_TAG_MERGE_KEEP, GST_TAG_BITRATE,
parse->priv->avg_bitrate, NULL);
}
parse->priv->pending_events =
g_list_prepend (parse->priv->pending_events,
gst_event_new_tag (merged_tags));
}
/* gst_base_parse_parse_frame:
* @parse: #GstBaseParse.
* @buffer: #GstBuffer.
*
* Default callback for parse_frame.
*/
static GstFlowReturn
gst_base_parse_parse_frame (GstBaseParse * parse, GstBaseParseFrame * frame)
{
GstBuffer *buffer = frame->buffer;
if (!GST_BUFFER_PTS_IS_VALID (buffer) &&
GST_CLOCK_TIME_IS_VALID (parse->priv->next_pts)) {
GST_BUFFER_PTS (buffer) = parse->priv->next_pts;
}
if (!GST_BUFFER_DTS_IS_VALID (buffer) &&
GST_CLOCK_TIME_IS_VALID (parse->priv->next_dts)) {
GST_BUFFER_DTS (buffer) = parse->priv->next_dts;
}
if (!GST_BUFFER_DURATION_IS_VALID (buffer) &&
GST_CLOCK_TIME_IS_VALID (parse->priv->frame_duration)) {
GST_BUFFER_DURATION (buffer) = parse->priv->frame_duration;
}
return GST_FLOW_OK;
}
/* gst_base_parse_convert:
* @parse: #GstBaseParse.
* @src_format: #GstFormat describing the source format.
* @src_value: Source value to be converted.
* @dest_format: #GstFormat defining the converted format.
* @dest_value: Pointer where the conversion result will be put.
*
* Converts using configured "convert" vmethod in #GstBaseParse class.
*
* Returns: %TRUE if conversion was successful.
*/
static gboolean
gst_base_parse_convert (GstBaseParse * parse,
GstFormat src_format,
gint64 src_value, GstFormat dest_format, gint64 * dest_value)
{
GstBaseParseClass *klass = GST_BASE_PARSE_GET_CLASS (parse);
gboolean ret;
g_return_val_if_fail (dest_value != NULL, FALSE);
if (!klass->convert)
return FALSE;
ret = klass->convert (parse, src_format, src_value, dest_format, dest_value);
#ifndef GST_DISABLE_GST_DEBUG
{
if (ret) {
if (src_format == GST_FORMAT_TIME && dest_format == GST_FORMAT_BYTES) {
GST_LOG_OBJECT (parse,
"TIME -> BYTES: %" GST_TIME_FORMAT " -> %" G_GINT64_FORMAT,
GST_TIME_ARGS (src_value), *dest_value);
} else if (dest_format == GST_FORMAT_TIME &&
src_format == GST_FORMAT_BYTES) {
GST_LOG_OBJECT (parse,
"BYTES -> TIME: %" G_GINT64_FORMAT " -> %" GST_TIME_FORMAT,
src_value, GST_TIME_ARGS (*dest_value));
} else {
GST_LOG_OBJECT (parse,
"%s -> %s: %" G_GINT64_FORMAT " -> %" G_GINT64_FORMAT,
GST_STR_NULL (gst_format_get_name (src_format)),
GST_STR_NULL (gst_format_get_name (dest_format)),
src_value, *dest_value);
}
} else {
GST_DEBUG_OBJECT (parse, "conversion failed");
}
}
#endif
return ret;
}
static gboolean
update_upstream_provided (GQuark field_id, const GValue * value,
gpointer user_data)
{
GstCaps *default_caps = user_data;
gint i;
gint caps_size;
caps_size = gst_caps_get_size (default_caps);
for (i = 0; i < caps_size; i++) {
GstStructure *structure = gst_caps_get_structure (default_caps, i);
if (gst_structure_id_has_field (structure, field_id))
gst_structure_id_set_value (structure, field_id, value);
}
return TRUE;
}
static GstCaps *
gst_base_parse_negotiate_default_caps (GstBaseParse * parse)
{
GstCaps *caps, *templcaps;
GstCaps *sinkcaps = NULL;
GstCaps *default_caps = NULL;
GstStructure *structure;
templcaps = gst_pad_get_pad_template_caps (GST_BASE_PARSE_SRC_PAD (parse));
caps = gst_pad_peer_query_caps (GST_BASE_PARSE_SRC_PAD (parse), templcaps);
if (caps)
gst_caps_unref (templcaps);
else
caps = templcaps;
templcaps = NULL;
if (!caps || gst_caps_is_empty (caps) || gst_caps_is_any (caps)) {
goto caps_error;
}
GST_LOG_OBJECT (parse, "peer caps %" GST_PTR_FORMAT, caps);
/* before fixating, try to use whatever upstream provided */
default_caps = gst_caps_copy (caps);
sinkcaps = gst_pad_get_current_caps (GST_BASE_PARSE_SINK_PAD (parse));
GST_LOG_OBJECT (parse, "current caps %" GST_PTR_FORMAT " for sinkpad",
sinkcaps);
if (sinkcaps) {
structure = gst_caps_get_structure (sinkcaps, 0);
gst_structure_foreach (structure, update_upstream_provided, default_caps);
}
default_caps = gst_caps_fixate (default_caps);
if (!default_caps) {
GST_WARNING_OBJECT (parse, "Failed to create default caps !");
goto caps_error;
}
GST_INFO_OBJECT (parse,
"Chose default caps %" GST_PTR_FORMAT " for initial gap", default_caps);
gst_caps_unref (sinkcaps);
gst_caps_unref (caps);
return default_caps;
caps_error:
{
if (caps)
gst_caps_unref (caps);
if (sinkcaps)
gst_caps_unref (sinkcaps);
return NULL;
}
}
/* 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, GstObject * parent, GstEvent * event)
{
GstBaseParse *parse = GST_BASE_PARSE (parent);
GstBaseParseClass *bclass = GST_BASE_PARSE_GET_CLASS (parse);
gboolean ret;
ret = bclass->sink_event (parse, event);
return ret;
}
/* gst_base_parse_sink_event_default:
* @parse: #GstBaseParse.
* @event: #GstEvent to be handled.
*
* Element-level event handler function.
*
* The event will be unreffed only if it has been handled and this
* function returns %TRUE
*
* Returns: %TRUE if the event was handled and not need forwarding.
*/
static gboolean
gst_base_parse_sink_event_default (GstBaseParse * parse, GstEvent * event)
{
GstBaseParseClass *klass = GST_BASE_PARSE_GET_CLASS (parse);
gboolean ret = FALSE;
gboolean forward_immediate = FALSE;
GST_DEBUG_OBJECT (parse, "handling event %d, %s", GST_EVENT_TYPE (event),
GST_EVENT_TYPE_NAME (event));
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_CAPS:
{
GstCaps *caps;
gst_event_parse_caps (event, &caps);
GST_DEBUG_OBJECT (parse, "caps: %" GST_PTR_FORMAT, caps);
if (klass->set_sink_caps)
ret = klass->set_sink_caps (parse, caps);
else
ret = TRUE;
/* will send our own caps downstream */
gst_event_unref (event);
event = NULL;
break;
}
case GST_EVENT_SEGMENT:
{
const GstSegment *in_segment;
GstSegment out_segment;
gint64 offset = 0, next_dts;
guint32 seqnum = gst_event_get_seqnum (event);
gst_event_parse_segment (event, &in_segment);
gst_segment_init (&out_segment, GST_FORMAT_TIME);
out_segment.rate = in_segment->rate;
out_segment.applied_rate = in_segment->applied_rate;
GST_DEBUG_OBJECT (parse, "segment %" GST_SEGMENT_FORMAT, in_segment);
parse->priv->upstream_format = in_segment->format;
if (in_segment->format == GST_FORMAT_BYTES) {
GstBaseParseSeek *seek = NULL;
GSList *node;
/* stop time is allowed to be open-ended, but not start & pos */
offset = in_segment->time;
GST_OBJECT_LOCK (parse);
for (node = parse->priv->pending_seeks; node; node = node->next) {
GstBaseParseSeek *tmp = node->data;
if (tmp->offset == offset) {
seek = tmp;
break;
}
}
parse->priv->pending_seeks =
g_slist_remove (parse->priv->pending_seeks, seek);
GST_OBJECT_UNLOCK (parse);
if (seek) {
GST_DEBUG_OBJECT (parse,
"Matched newsegment to%s seek: %" GST_SEGMENT_FORMAT,
seek->accurate ? " accurate" : "", &seek->segment);
out_segment.start = seek->segment.start;
out_segment.stop = seek->segment.stop;
out_segment.time = seek->segment.start;
next_dts = seek->start_ts;
parse->priv->exact_position = seek->accurate;
g_free (seek);
} else {
/* best attempt convert */
/* as these are only estimates, stop is kept open-ended to avoid
* premature cutting */
gst_base_parse_convert (parse, GST_FORMAT_BYTES, in_segment->start,
GST_FORMAT_TIME, (gint64 *) & next_dts);
out_segment.start = next_dts;
out_segment.stop = GST_CLOCK_TIME_NONE;
out_segment.time = next_dts;
parse->priv->exact_position = (in_segment->start == 0);
}
gst_event_unref (event);
event = gst_event_new_segment (&out_segment);
gst_event_set_seqnum (event, seqnum);
GST_DEBUG_OBJECT (parse, "Converted incoming segment to TIME. %"
GST_SEGMENT_FORMAT, in_segment);
} else if (in_segment->format != GST_FORMAT_TIME) {
/* Unknown incoming segment format. Output a default open-ended
* TIME segment */
gst_event_unref (event);
out_segment.start = 0;
out_segment.stop = GST_CLOCK_TIME_NONE;
out_segment.time = 0;
event = gst_event_new_segment (&out_segment);
gst_event_set_seqnum (event, seqnum);
next_dts = 0;
} else {
/* not considered BYTE seekable if it is talking to us in TIME,
* whatever else it might claim */
parse->priv->upstream_seekable = FALSE;
next_dts = in_segment->start;
gst_event_copy_segment (event, &out_segment);
}
memcpy (&parse->segment, &out_segment, sizeof (GstSegment));
/*
gst_segment_set_newsegment (&parse->segment, update, rate,
applied_rate, format, start, stop, start);
*/
ret = TRUE;
/* 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 but finish the current segment */
GST_DEBUG_OBJECT (parse, "draining current segment");
if (in_segment->rate > 0.0)
gst_base_parse_drain (parse);
else
gst_base_parse_finish_fragment (parse, FALSE);
gst_adapter_clear (parse->priv->adapter);
parse->priv->offset = offset;
parse->priv->sync_offset = offset;
parse->priv->next_dts = next_dts;
parse->priv->next_pts = GST_CLOCK_TIME_NONE;
parse->priv->last_pts = GST_CLOCK_TIME_NONE;
parse->priv->last_dts = GST_CLOCK_TIME_NONE;
parse->priv->prev_pts = GST_CLOCK_TIME_NONE;
parse->priv->prev_dts = GST_CLOCK_TIME_NONE;
parse->priv->prev_dts_from_pts = FALSE;
parse->priv->discont = TRUE;
parse->priv->seen_keyframe = FALSE;
parse->priv->skip = 0;
break;
}
case GST_EVENT_SEGMENT_DONE:
/* need to drain now, rather than upon a new segment,
* since that would have SEGMENT_DONE come before potential
* delayed last part of the current segment */
GST_DEBUG_OBJECT (parse, "draining current segment");
if (parse->segment.rate > 0.0)
gst_base_parse_drain (parse);
else
gst_base_parse_finish_fragment (parse, FALSE);
/* Also forward event immediately, there might be no new data
* coming afterwards that would allow us to forward it later */
forward_immediate = TRUE;
break;
case GST_EVENT_FLUSH_START:
GST_OBJECT_LOCK (parse);
parse->priv->flushing = TRUE;
GST_OBJECT_UNLOCK (parse);
break;
case GST_EVENT_FLUSH_STOP:
gst_adapter_clear (parse->priv->adapter);
gst_base_parse_clear_queues (parse);
parse->priv->flushing = FALSE;
parse->priv->discont = TRUE;
parse->priv->last_pts = GST_CLOCK_TIME_NONE;
parse->priv->last_dts = GST_CLOCK_TIME_NONE;
parse->priv->new_frame = TRUE;
parse->priv->skip = 0;
forward_immediate = TRUE;
break;
case GST_EVENT_EOS:
if (parse->segment.rate > 0.0)
gst_base_parse_drain (parse);
else
gst_base_parse_finish_fragment (parse, TRUE);
/* If we STILL have zero frames processed, fire an error */
if (parse->priv->framecount == 0 && !parse->priv->saw_gaps &&
!parse->priv->first_buffer) {
GST_ELEMENT_ERROR (parse, STREAM, WRONG_TYPE,
("No valid frames found before end of stream"), (NULL));
}
if (!parse->priv->saw_gaps
&& parse->priv->framecount < MIN_FRAMES_TO_POST_BITRATE) {
/* We've not posted bitrate tags yet - do so now */
gst_base_parse_queue_tag_event_update (parse);
}
/* newsegment and other serialized events before eos */
gst_base_parse_push_pending_events (parse);
forward_immediate = TRUE;
break;
case GST_EVENT_CUSTOM_DOWNSTREAM:{
/* FIXME: Code duplicated from libgstvideo because core can't depend on -base */
#ifndef GST_VIDEO_EVENT_STILL_STATE_NAME
#define GST_VIDEO_EVENT_STILL_STATE_NAME "GstEventStillFrame"
#endif
const GstStructure *s;
gboolean ev_still_state;
s = gst_event_get_structure (event);
if (s != NULL &&
gst_structure_has_name (s, GST_VIDEO_EVENT_STILL_STATE_NAME) &&
gst_structure_get_boolean (s, "still-state", &ev_still_state)) {
if (ev_still_state) {
GST_DEBUG_OBJECT (parse, "draining current data for still-frame");
if (parse->segment.rate > 0.0)
gst_base_parse_drain (parse);
else
gst_base_parse_finish_fragment (parse, TRUE);
}
forward_immediate = TRUE;
}
break;
}
case GST_EVENT_GAP:
{
GST_DEBUG_OBJECT (parse, "draining current data due to gap event");
/* Ensure we have caps before forwarding the event */
if (!gst_pad_has_current_caps (GST_BASE_PARSE_SRC_PAD (parse))) {
GstCaps *default_caps = NULL;
if ((default_caps = gst_base_parse_negotiate_default_caps (parse))) {
GST_DEBUG_OBJECT (parse,
"Store caps event to pending list for initial pre-rolling");
parse->priv->pending_events =
g_list_prepend (parse->priv->pending_events,
gst_event_new_caps (default_caps));
gst_caps_unref (default_caps);
} else {
gst_event_unref (event);
event = NULL;
ret = FALSE;
GST_ELEMENT_ERROR (parse, STREAM, FORMAT, (NULL),
("Parser output not negotiated before GAP event."));
break;
}
}
gst_base_parse_push_pending_events (parse);
if (parse->segment.rate > 0.0)
gst_base_parse_drain (parse);
else
gst_base_parse_finish_fragment (parse, TRUE);
forward_immediate = TRUE;
parse->priv->saw_gaps = TRUE;
break;
}
case GST_EVENT_TAG:
{
GstTagList *tags = NULL;
gst_event_parse_tag (event, &tags);
/* We only care about stream tags here, global tags we just forward */
if (gst_tag_list_get_scope (tags) != GST_TAG_SCOPE_STREAM)
break;
gst_base_parse_set_upstream_tags (parse, tags);
gst_base_parse_queue_tag_event_update (parse);
parse->priv->tags_changed = FALSE;
gst_event_unref (event);
event = NULL;
ret = TRUE;
break;
}
case GST_EVENT_STREAM_START:
{
if (parse->priv->pad_mode != GST_PAD_MODE_PULL)
forward_immediate = TRUE;
gst_base_parse_set_upstream_tags (parse, NULL);
parse->priv->tags_changed = TRUE;
break;
}
default:
break;
}
/* Forward non-serialized events and EOS/FLUSH_STOP immediately.
* For EOS this is required because no buffer or serialized event
* will come after EOS and nothing could trigger another
* _finish_frame() call. *
* If the subclass handles sending of EOS manually it can return
* _DROPPED from ::finish() and all other subclasses should have
* decoded/flushed all remaining data before this
*
* For FLUSH_STOP this is required because it is expected
* to be forwarded immediately and no buffers are queued anyway.
*/
if (event) {
if (!GST_EVENT_IS_SERIALIZED (event) || forward_immediate) {
ret = gst_pad_push_event (parse->srcpad, event);
} else {
parse->priv->pending_events =
g_list_prepend (parse->priv->pending_events, event);
ret = TRUE;
}
}
GST_DEBUG_OBJECT (parse, "event handled");
return ret;
}
static gboolean
gst_base_parse_sink_query_default (GstBaseParse * parse, GstQuery * query)
{
GstPad *pad;
gboolean res;
pad = GST_BASE_PARSE_SINK_PAD (parse);
switch (GST_QUERY_TYPE (query)) {
case GST_QUERY_CAPS:
{
GstBaseParseClass *bclass;
bclass = GST_BASE_PARSE_GET_CLASS (parse);
if (bclass->get_sink_caps) {
GstCaps *caps, *filter;
gst_query_parse_caps (query, &filter);
caps = bclass->get_sink_caps (parse, filter);
GST_LOG_OBJECT (parse, "sink getcaps returning caps %" GST_PTR_FORMAT,
caps);
gst_query_set_caps_result (query, caps);
gst_caps_unref (caps);
res = TRUE;
} else {
GstCaps *caps, *template_caps, *filter;
gst_query_parse_caps (query, &filter);
template_caps = gst_pad_get_pad_template_caps (pad);
if (filter != NULL) {
caps =
gst_caps_intersect_full (filter, template_caps,
GST_CAPS_INTERSECT_FIRST);
gst_caps_unref (template_caps);
} else {
caps = template_caps;
}
gst_query_set_caps_result (query, caps);
gst_caps_unref (caps);
res = TRUE;
}
break;
}
default:
{
res = gst_pad_query_default (pad, GST_OBJECT_CAST (parse), query);
break;
}
}
return res;
}
static gboolean
gst_base_parse_sink_query (GstPad * pad, GstObject * parent, GstQuery * query)
{
GstBaseParseClass *bclass;
GstBaseParse *parse;
gboolean ret;
parse = GST_BASE_PARSE (parent);
bclass = GST_BASE_PARSE_GET_CLASS (parse);
GST_DEBUG_OBJECT (parse, "%s query", GST_QUERY_TYPE_NAME (query));
if (bclass->sink_query)
ret = bclass->sink_query (parse, query);
else
ret = FALSE;
GST_LOG_OBJECT (parse, "%s query result: %d %" GST_PTR_FORMAT,
GST_QUERY_TYPE_NAME (query), ret, query);
return ret;
}
static gboolean
gst_base_parse_src_query (GstPad * pad, GstObject * parent, GstQuery * query)
{
GstBaseParseClass *bclass;
GstBaseParse *parse;
gboolean ret;
parse = GST_BASE_PARSE (parent);
bclass = GST_BASE_PARSE_GET_CLASS (parse);
GST_DEBUG_OBJECT (parse, "%s query: %" GST_PTR_FORMAT,
GST_QUERY_TYPE_NAME (query), query);
if (bclass->src_query)
ret = bclass->src_query (parse, query);
else
ret = FALSE;
GST_LOG_OBJECT (parse, "%s query result: %d %" GST_PTR_FORMAT,
GST_QUERY_TYPE_NAME (query), ret, query);
return ret;
}
/* 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, GstObject * parent, GstEvent * event)
{
GstBaseParse *parse;
GstBaseParseClass *bclass;
gboolean ret = TRUE;
parse = GST_BASE_PARSE (parent);
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)
ret = bclass->src_event (parse, event);
else
gst_event_unref (event);
return ret;
}
static gboolean
gst_base_parse_is_seekable (GstBaseParse * parse)
{
/* FIXME: could do more here, e.g. check index or just send data from 0
* in pull mode and let decoder/sink clip */
return parse->priv->syncable;
}
/* gst_base_parse_src_event_default:
* @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_event_default (GstBaseParse * parse, GstEvent * event)
{
gboolean res = FALSE;
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_SEEK:
if (gst_base_parse_is_seekable (parse))
res = gst_base_parse_handle_seek (parse, event);
break;
default:
res = gst_pad_event_default (parse->srcpad, GST_OBJECT_CAST (parse),
event);
break;
}
return res;
}
/**
* gst_base_parse_convert_default:
* @parse: #GstBaseParse.
* @src_format: #GstFormat describing the source format.
* @src_value: Source value to be converted.
* @dest_format: #GstFormat defining the converted format.
* @dest_value: Pointer where the conversion result will be put.
*
* Default implementation of "convert" vmethod in #GstBaseParse class.
*
* Returns: %TRUE if conversion was successful.
*/
gboolean
gst_base_parse_convert_default (GstBaseParse * parse,
GstFormat src_format,
gint64 src_value, GstFormat dest_format, gint64 * dest_value)
{
gboolean ret = FALSE;
guint64 bytes, duration;
if (G_UNLIKELY (src_format == dest_format)) {
*dest_value = src_value;
return TRUE;
}
if (G_UNLIKELY (src_value == -1)) {
*dest_value = -1;
return TRUE;
}
if (G_UNLIKELY (src_value == 0)) {
*dest_value = 0;
return TRUE;
}
/* need at least some frames */
if (!parse->priv->framecount)
goto no_framecount;
duration = parse->priv->acc_duration / GST_MSECOND;
bytes = parse->priv->bytecount;
if (G_UNLIKELY (!duration || !bytes))
goto no_duration_bytes;
if (src_format == GST_FORMAT_BYTES) {
if (dest_format == GST_FORMAT_TIME) {
/* BYTES -> TIME conversion */
GST_DEBUG_OBJECT (parse, "converting bytes -> time");
*dest_value = gst_util_uint64_scale (src_value, duration, bytes);
*dest_value *= GST_MSECOND;
GST_DEBUG_OBJECT (parse, "conversion result: %" G_GINT64_FORMAT " ms",
*dest_value / GST_MSECOND);
ret = TRUE;
} else {
GST_DEBUG_OBJECT (parse, "converting bytes -> other not implemented");
}
} else if (src_format == GST_FORMAT_TIME) {
if (dest_format == GST_FORMAT_BYTES) {
GST_DEBUG_OBJECT (parse, "converting time -> bytes");
*dest_value = gst_util_uint64_scale (src_value / GST_MSECOND, bytes,
duration);
GST_DEBUG_OBJECT (parse,
"time %" G_GINT64_FORMAT " ms in bytes = %" G_GINT64_FORMAT,
src_value / GST_MSECOND, *dest_value);
ret = TRUE;
} else {
GST_DEBUG_OBJECT (parse, "converting time -> other not implemented");
}
} else if (src_format == GST_FORMAT_DEFAULT) {
/* DEFAULT == frame-based */
if (dest_format == GST_FORMAT_TIME) {
GST_DEBUG_OBJECT (parse, "converting default -> time");
if (parse->priv->fps_den) {
*dest_value = gst_util_uint64_scale (src_value,
GST_SECOND * parse->priv->fps_den, parse->priv->fps_num);
ret = TRUE;
}
} else {
GST_DEBUG_OBJECT (parse, "converting default -> other not implemented");
}
} else {
GST_DEBUG_OBJECT (parse, "conversion not implemented");
}
return ret;
/* ERRORS */
no_framecount:
{
GST_DEBUG_OBJECT (parse, "no framecount");
return FALSE;
}
no_duration_bytes:
{
GST_DEBUG_OBJECT (parse, "no duration %" G_GUINT64_FORMAT ", bytes %"
G_GUINT64_FORMAT, duration, bytes);
return FALSE;
}
}
static void
gst_base_parse_update_duration (GstBaseParse * parse)
{
gint64 ptot, dest_value;
if (!gst_pad_peer_query_duration (parse->sinkpad, GST_FORMAT_BYTES, &ptot))
return;
if (!gst_base_parse_convert (parse, GST_FORMAT_BYTES, ptot,
GST_FORMAT_TIME, &dest_value))
return;
/* inform if duration changed, but try to avoid spamming */
parse->priv->estimated_drift += dest_value - parse->priv->estimated_duration;
parse->priv->estimated_duration = dest_value;
GST_LOG_OBJECT (parse,
"updated estimated duration to %" GST_TIME_FORMAT,
GST_TIME_ARGS (dest_value));
if (parse->priv->estimated_drift > GST_SECOND ||
parse->priv->estimated_drift < -GST_SECOND) {
gst_element_post_message (GST_ELEMENT (parse),
gst_message_new_duration_changed (GST_OBJECT (parse)));
parse->priv->estimated_drift = 0;
}
}
/* gst_base_parse_update_bitrates:
* @parse: #GstBaseParse.
* @buffer: Current frame as a #GstBuffer
*
* Keeps track of the minimum and maximum bitrates, and also maintains a
* running average bitrate of the stream so far.
*/
static void
gst_base_parse_update_bitrates (GstBaseParse * parse, GstBaseParseFrame * frame)
{
guint64 data_len, frame_dur;
gint overhead, frame_bitrate;
GstBuffer *buffer = frame->buffer;
overhead = frame->overhead;
if (overhead == -1)
return;
data_len = gst_buffer_get_size (buffer) - overhead;
parse->priv->data_bytecount += data_len;
/* duration should be valid by now,
* either set by subclass or maybe based on fps settings */
if (GST_BUFFER_DURATION_IS_VALID (buffer) && parse->priv->acc_duration != 0) {
/* Calculate duration of a frame from buffer properties */
frame_dur = GST_BUFFER_DURATION (buffer);
parse->priv->avg_bitrate = (8 * parse->priv->data_bytecount * GST_SECOND) /
parse->priv->acc_duration;
} else {
/* No way to figure out frame duration (is this even possible?) */
return;
}
/* override if subclass provided bitrate, e.g. metadata based */
if (parse->priv->bitrate) {
parse->priv->avg_bitrate = parse->priv->bitrate;
/* spread this (confirmed) info ASAP */
if (parse->priv->posted_avg_bitrate != parse->priv->avg_bitrate)
parse->priv->tags_changed = TRUE;
}
if (frame_dur)
frame_bitrate = (8 * data_len * GST_SECOND) / frame_dur;
else
return;
GST_LOG_OBJECT (parse, "frame bitrate %u, avg bitrate %u", frame_bitrate,
parse->priv->avg_bitrate);
if (parse->priv->framecount < MIN_FRAMES_TO_POST_BITRATE)
return;
if (parse->priv->framecount == MIN_FRAMES_TO_POST_BITRATE &&
(parse->priv->post_min_bitrate || parse->priv->post_avg_bitrate
|| parse->priv->post_max_bitrate))
parse->priv->tags_changed = TRUE;
if (G_LIKELY (parse->priv->framecount >= MIN_FRAMES_TO_POST_BITRATE)) {
if (frame_bitrate < parse->priv->min_bitrate) {
parse->priv->min_bitrate = frame_bitrate;
if (parse->priv->post_min_bitrate)
parse->priv->tags_changed = TRUE;
}
if (frame_bitrate > parse->priv->max_bitrate) {
parse->priv->max_bitrate = frame_bitrate;
if (parse->priv->post_max_bitrate)
parse->priv->tags_changed = TRUE;
}
/* Only update the tag on a 2% change */
if (parse->priv->post_avg_bitrate && parse->priv->avg_bitrate) {
guint64 diffprev = gst_util_uint64_scale_int (100,
ABSDIFF (parse->priv->avg_bitrate, parse->priv->posted_avg_bitrate),
parse->priv->avg_bitrate);
if (diffprev >= UPDATE_THRESHOLD)
parse->priv->tags_changed = TRUE;
}
}
}
/**
* gst_base_parse_add_index_entry:
* @parse: #GstBaseParse.
* @offset: offset of entry
* @ts: timestamp associated with offset
* @key: whether entry refers to keyframe
* @force: add entry disregarding sanity checks
*
* Adds an entry to the index associating @offset to @ts. It is recommended
* to only add keyframe entries. @force allows to bypass checks, such as
* whether the stream is (upstream) seekable, another entry is already "close"
* to the new entry, etc.
*
* Returns: #gboolean indicating whether entry was added
*/
gboolean
gst_base_parse_add_index_entry (GstBaseParse * parse, guint64 offset,
GstClockTime ts, gboolean key, gboolean force)
{
gboolean ret = FALSE;
GstIndexAssociation associations[2];
GST_LOG_OBJECT (parse, "Adding key=%d index entry %" GST_TIME_FORMAT
" @ offset 0x%08" G_GINT64_MODIFIER "x", key, GST_TIME_ARGS (ts), offset);
if (G_LIKELY (!force)) {
if (!parse->priv->upstream_seekable) {
GST_DEBUG_OBJECT (parse, "upstream not seekable; discarding");
goto exit;
}
/* FIXME need better helper data structure that handles these issues
* related to ongoing collecting of index entries */
if (parse->priv->index_last_offset + parse->priv->idx_byte_interval >=
(gint64) offset) {
GST_LOG_OBJECT (parse,
"already have entries up to offset 0x%08" G_GINT64_MODIFIER "x",
parse->priv->index_last_offset + parse->priv->idx_byte_interval);
goto exit;
}
if (GST_CLOCK_TIME_IS_VALID (parse->priv->index_last_ts) &&
GST_CLOCK_DIFF (parse->priv->index_last_ts, ts) <
parse->priv->idx_interval) {
GST_LOG_OBJECT (parse, "entry too close to last time %" GST_TIME_FORMAT,
GST_TIME_ARGS (parse->priv->index_last_ts));
goto exit;
}
/* if last is not really the last one */
if (!parse->priv->index_last_valid) {
GstClockTime prev_ts;
gst_base_parse_find_offset (parse, ts, TRUE, &prev_ts);
if (GST_CLOCK_DIFF (prev_ts, ts) < parse->priv->idx_interval) {
GST_LOG_OBJECT (parse,
"entry too close to existing entry %" GST_TIME_FORMAT,
GST_TIME_ARGS (prev_ts));
parse->priv->index_last_offset = offset;
parse->priv->index_last_ts = ts;
goto exit;
}
}
}
associations[0].format = GST_FORMAT_TIME;
associations[0].value = ts;
associations[1].format = GST_FORMAT_BYTES;
associations[1].value = offset;
/* index might change on-the-fly, although that would be nutty app ... */
GST_BASE_PARSE_INDEX_LOCK (parse);
gst_index_add_associationv (parse->priv->index, parse->priv->index_id,
(key) ? GST_INDEX_ASSOCIATION_FLAG_KEY_UNIT :
GST_INDEX_ASSOCIATION_FLAG_DELTA_UNIT, 2,
(const GstIndexAssociation *) &associations);
GST_BASE_PARSE_INDEX_UNLOCK (parse);
if (key) {
parse->priv->index_last_offset = offset;
parse->priv->index_last_ts = ts;
}
ret = TRUE;
exit:
return ret;
}
/* check for seekable upstream, above and beyond a mere query */
static void
gst_base_parse_check_seekability (GstBaseParse * parse)
{
GstQuery *query;
gboolean seekable = FALSE;
gint64 start = -1, stop = -1;
guint idx_interval = 0;
guint64 idx_byte_interval = 0;
query = gst_query_new_seeking (GST_FORMAT_BYTES);
if (!gst_pad_peer_query (parse->sinkpad, query)) {
GST_DEBUG_OBJECT (parse, "seeking query failed");
goto done;
}
gst_query_parse_seeking (query, NULL, &seekable, &start, &stop);
/* try harder to query upstream size if we didn't get it the first time */
if (seekable && stop == -1) {
GST_DEBUG_OBJECT (parse, "doing duration query to fix up unset stop");
gst_pad_peer_query_duration (parse->sinkpad, GST_FORMAT_BYTES, &stop);
}
/* if upstream doesn't know the size, it's likely that it's not seekable in
* practice even if it technically may be seekable */
if (seekable && (start != 0 || stop <= start)) {
GST_DEBUG_OBJECT (parse, "seekable but unknown start/stop -> disable");
seekable = FALSE;
}
/* let's not put every single frame into our index */
if (seekable) {
if (stop < 10 * 1024 * 1024)
idx_interval = 100;
else if (stop < 100 * 1024 * 1024)
idx_interval = 500;
else
idx_interval = 1000;
/* ensure that even for large files (e.g. very long audio files), the index
* stays reasonably-size, with some arbitrary limit to the total number of
* index entries */
idx_byte_interval = (stop - start) / MAX_INDEX_ENTRIES;
GST_DEBUG_OBJECT (parse,
"Limiting index entries to %d, indexing byte interval %"
G_GUINT64_FORMAT " bytes", MAX_INDEX_ENTRIES, idx_byte_interval);
}
done:
gst_query_unref (query);
GST_DEBUG_OBJECT (parse, "seekable: %d (%" G_GUINT64_FORMAT " - %"
G_GUINT64_FORMAT ")", seekable, start, stop);
parse->priv->upstream_seekable = seekable;
parse->priv->upstream_size = seekable ? stop : 0;
GST_DEBUG_OBJECT (parse, "idx_interval: %ums", idx_interval);
parse->priv->idx_interval = idx_interval * GST_MSECOND;
parse->priv->idx_byte_interval = idx_byte_interval;
}
/* some misc checks on upstream */
static void
gst_base_parse_check_upstream (GstBaseParse * parse)
{
gint64 stop;
if (gst_pad_peer_query_duration (parse->sinkpad, GST_FORMAT_TIME, &stop))
if (GST_CLOCK_TIME_IS_VALID (stop) && stop) {
/* upstream has one, accept it also, and no further updates */
gst_base_parse_set_duration (parse, GST_FORMAT_TIME, stop, 0);
parse->priv->upstream_has_duration = TRUE;
}
GST_DEBUG_OBJECT (parse, "upstream_has_duration: %d",
parse->priv->upstream_has_duration);
}
/* checks src caps to determine if dealing with audio or video */
/* TODO maybe forego automagic stuff and let subclass configure it ? */
static void
gst_base_parse_check_media (GstBaseParse * parse)
{
GstCaps *caps;
GstStructure *s;
caps = gst_pad_get_current_caps (parse->srcpad);
if (G_LIKELY (caps) && (s = gst_caps_get_structure (caps, 0))) {
parse->priv->is_video =
g_str_has_prefix (gst_structure_get_name (s), "video");
} else {
/* historical default */
parse->priv->is_video = FALSE;
}
if (caps)
gst_caps_unref (caps);
parse->priv->checked_media = TRUE;
GST_DEBUG_OBJECT (parse, "media is video: %d", parse->priv->is_video);
}
/* takes ownership of frame */
static void
gst_base_parse_queue_frame (GstBaseParse * parse, GstBaseParseFrame * frame)
{
if (!(frame->_private_flags & GST_BASE_PARSE_FRAME_PRIVATE_FLAG_NOALLOC)) {
/* frame allocated on the heap, we can just take ownership */
g_queue_push_tail (&parse->priv->queued_frames, frame);
GST_TRACE ("queued frame %p", frame);
} else {
GstBaseParseFrame *copy;
/* probably allocated on the stack, must make a proper copy */
copy = gst_base_parse_frame_copy (frame);
g_queue_push_tail (&parse->priv->queued_frames, copy);
GST_TRACE ("queued frame %p (copy of %p)", copy, frame);
gst_base_parse_frame_free (frame);
}
}
/* makes sure that @buf is properly prepared and decorated for passing
* to baseclass, and an equally setup frame is returned setup with @buf.
* Takes ownership of @buf. */
static GstBaseParseFrame *
gst_base_parse_prepare_frame (GstBaseParse * parse, GstBuffer * buffer)
{
GstBaseParseFrame *frame = NULL;
buffer = gst_buffer_make_writable (buffer);
GST_LOG_OBJECT (parse,
"preparing frame at offset %" G_GUINT64_FORMAT
" (%#" G_GINT64_MODIFIER "x) of size %" G_GSIZE_FORMAT,
GST_BUFFER_OFFSET (buffer), GST_BUFFER_OFFSET (buffer),
gst_buffer_get_size (buffer));
GST_BUFFER_OFFSET (buffer) = parse->priv->offset;
gst_base_parse_update_flags (parse);
frame = gst_base_parse_frame_new (buffer, 0, 0);
gst_buffer_unref (buffer);
gst_base_parse_update_frame (parse, frame);
/* clear flags for next frame */
parse->priv->discont = FALSE;
parse->priv->new_frame = FALSE;
/* use default handler to provide initial (upstream) metadata */
gst_base_parse_parse_frame (parse, frame);
return frame;
}
/* Wraps buffer in a frame and dispatches to subclass.
* Also manages data skipping and offset handling (including adapter flushing).
* Takes ownership of @buffer */
static GstFlowReturn
gst_base_parse_handle_buffer (GstBaseParse * parse, GstBuffer * buffer,
gint * skip, gint * flushed)
{
GstBaseParseClass *klass = GST_BASE_PARSE_GET_CLASS (parse);
GstBaseParseFrame *frame;
GstFlowReturn ret;
g_return_val_if_fail (skip != NULL || flushed != NULL, GST_FLOW_ERROR);
GST_LOG_OBJECT (parse,
"handling buffer of size %" G_GSIZE_FORMAT " with dts %" GST_TIME_FORMAT
", pts %" GST_TIME_FORMAT ", duration %" GST_TIME_FORMAT,
gst_buffer_get_size (buffer), GST_TIME_ARGS (GST_BUFFER_DTS (buffer)),
GST_TIME_ARGS (GST_BUFFER_PTS (buffer)),
GST_TIME_ARGS (GST_BUFFER_DURATION (buffer)));
/* track what is being flushed during this single round of frame processing */
parse->priv->flushed = 0;
*skip = 0;
/* make it easy for _finish_frame to pick up input data */
if (parse->priv->pad_mode == GST_PAD_MODE_PULL) {
gst_buffer_ref (buffer);
gst_adapter_push (parse->priv->adapter, buffer);
}
frame = gst_base_parse_prepare_frame (parse, buffer);
ret = klass->handle_frame (parse, frame, skip);
*flushed = parse->priv->flushed;
GST_LOG_OBJECT (parse, "handle_frame skipped %d, flushed %d",
*skip, *flushed);
/* subclass can only do one of these, or semantics are too unclear */
g_assert (*skip == 0 || *flushed == 0);
/* track skipping */
if (*skip > 0) {
GstClockTime pts, dts;
GstBuffer *outbuf;
GST_LOG_OBJECT (parse, "finding sync, skipping %d bytes", *skip);
if (parse->segment.rate < 0.0 && !parse->priv->buffers_queued) {
/* reverse playback, and no frames found yet, so we are skipping
* the leading part of a fragment, which may form the tail of
* fragment coming later, hopefully subclass skips efficiently ... */
pts = gst_adapter_prev_pts (parse->priv->adapter, NULL);
dts = gst_adapter_prev_dts (parse->priv->adapter, NULL);
outbuf = gst_adapter_take_buffer (parse->priv->adapter, *skip);
outbuf = gst_buffer_make_writable (outbuf);
GST_BUFFER_PTS (outbuf) = pts;
GST_BUFFER_DTS (outbuf) = dts;
parse->priv->buffers_head =
g_slist_prepend (parse->priv->buffers_head, outbuf);
outbuf = NULL;
} else {
/* If we're asked to skip more than is available in the adapter,
we need to remember what we need to skip for next iteration */
gsize av = gst_adapter_available (parse->priv->adapter);
GST_DEBUG ("Asked to skip %u (%" G_GSIZE_FORMAT " available)", *skip, av);
if (av >= *skip) {
gst_adapter_flush (parse->priv->adapter, *skip);
} else {
GST_DEBUG
("This is more than available, flushing %" G_GSIZE_FORMAT
", storing %u to skip", av, (guint) (*skip - av));
parse->priv->skip = *skip - av;
gst_adapter_flush (parse->priv->adapter, av);
*skip = av;
}
}
if (!parse->priv->discont)
parse->priv->sync_offset = parse->priv->offset;
parse->priv->offset += *skip;
parse->priv->discont = TRUE;
/* check for indefinite skipping */
if (ret == GST_FLOW_OK)
ret = gst_base_parse_check_sync (parse);
}
parse->priv->offset += *flushed;
if (parse->priv->pad_mode == GST_PAD_MODE_PULL) {
gst_adapter_clear (parse->priv->adapter);
}
gst_base_parse_frame_free (frame);
return ret;
}
/* gst_base_parse_push_pending_events:
* @parse: #GstBaseParse
*
* Pushes the pending events
*/
static void
gst_base_parse_push_pending_events (GstBaseParse * parse)
{
if (G_UNLIKELY (parse->priv->pending_events)) {
GList *r = g_list_reverse (parse->priv->pending_events);
GList *l;
parse->priv->pending_events = NULL;
for (l = r; l != NULL; l = l->next) {
gst_pad_push_event (parse->srcpad, GST_EVENT_CAST (l->data));
}
g_list_free (r);
}
}
/* gst_base_parse_handle_and_push_frame:
* @parse: #GstBaseParse.
* @klass: #GstBaseParseClass.
* @frame: (transfer full): a #GstBaseParseFrame
*
* 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_frame (GstBaseParse * parse,
GstBaseParseFrame * frame)
{
gint64 offset;
GstBuffer *buffer;
g_return_val_if_fail (frame != NULL, GST_FLOW_ERROR);
buffer = frame->buffer;
offset = frame->offset;
/* check if subclass/format can provide ts.
* If so, that allows and enables extra seek and duration determining options */
if (G_UNLIKELY (parse->priv->first_frame_offset < 0)) {
if (GST_BUFFER_PTS_IS_VALID (buffer) && parse->priv->has_timing_info
&& parse->priv->pad_mode == GST_PAD_MODE_PULL) {
parse->priv->first_frame_offset = offset;
parse->priv->first_frame_pts = GST_BUFFER_PTS (buffer);
parse->priv->first_frame_dts = GST_BUFFER_DTS (buffer);
GST_DEBUG_OBJECT (parse, "subclass provided dts %" GST_TIME_FORMAT
", pts %" GST_TIME_FORMAT " for first frame at offset %"
G_GINT64_FORMAT, GST_TIME_ARGS (parse->priv->first_frame_dts),
GST_TIME_ARGS (parse->priv->first_frame_pts),
parse->priv->first_frame_offset);
if (!GST_CLOCK_TIME_IS_VALID (parse->priv->duration)) {
gint64 off;
GstClockTime last_ts = G_MAXINT64;
GST_DEBUG_OBJECT (parse, "no duration; trying scan to determine");
gst_base_parse_locate_time (parse, &last_ts, &off);
if (GST_CLOCK_TIME_IS_VALID (last_ts))
gst_base_parse_set_duration (parse, GST_FORMAT_TIME, last_ts, 0);
}
} else {
/* disable further checks */
parse->priv->first_frame_offset = 0;
}
}
/* track upstream time if provided, not subclass' internal notion of it */
if (parse->priv->upstream_format == GST_FORMAT_TIME) {
GST_BUFFER_PTS (frame->buffer) = GST_CLOCK_TIME_NONE;
GST_BUFFER_DTS (frame->buffer) = GST_CLOCK_TIME_NONE;
}
/* interpolating and no valid pts yet,
* start with dts and carry on from there */
if (parse->priv->infer_ts && parse->priv->pts_interpolate
&& !GST_CLOCK_TIME_IS_VALID (parse->priv->next_pts))
parse->priv->next_pts = parse->priv->next_dts;
/* again use default handler to add missing metadata;
* we may have new information on frame properties */
gst_base_parse_parse_frame (parse, frame);
parse->priv->next_pts = GST_CLOCK_TIME_NONE;
if (GST_BUFFER_DTS_IS_VALID (buffer) && GST_BUFFER_DURATION_IS_VALID (buffer)) {
parse->priv->next_dts =
GST_BUFFER_DTS (buffer) + GST_BUFFER_DURATION (buffer);
if (parse->priv->pts_interpolate && GST_BUFFER_PTS_IS_VALID (buffer)) {
GstClockTime next_pts =
GST_BUFFER_PTS (buffer) + GST_BUFFER_DURATION (buffer);
if (next_pts >= parse->priv->next_dts)
parse->priv->next_pts = next_pts;
}
} else {
/* we lost track, do not produce bogus time next time around
* (probably means parser subclass has given up on parsing as well) */
GST_DEBUG_OBJECT (parse, "no next fallback timestamp");
parse->priv->next_dts = GST_CLOCK_TIME_NONE;
}
if (parse->priv->upstream_seekable && parse->priv->exact_position &&
GST_BUFFER_PTS_IS_VALID (buffer))
gst_base_parse_add_index_entry (parse, offset,
GST_BUFFER_PTS (buffer),
!GST_BUFFER_FLAG_IS_SET (buffer, GST_BUFFER_FLAG_DELTA_UNIT), FALSE);
/* All OK, push queued frames if there are any */
if (G_UNLIKELY (!g_queue_is_empty (&parse->priv->queued_frames))) {
GstBaseParseFrame *queued_frame;
while ((queued_frame = g_queue_pop_head (&parse->priv->queued_frames))) {
gst_base_parse_push_frame (parse, queued_frame);
gst_base_parse_frame_free (queued_frame);
}
}
return gst_base_parse_push_frame (parse, frame);
}
/**
* gst_base_parse_push_frame:
* @parse: #GstBaseParse.
* @frame: (transfer none): a #GstBaseParseFrame
*
* Pushes the frame's buffer downstream, sends any pending events and
* does some timestamp and segment handling. Takes ownership of
* frame's buffer, though caller retains ownership of @frame.
*
* This must be called with sinkpad STREAM_LOCK held.
*
* Returns: #GstFlowReturn
*/
GstFlowReturn
gst_base_parse_push_frame (GstBaseParse * parse, GstBaseParseFrame * frame)
{
GstFlowReturn ret = GST_FLOW_OK;
GstClockTime last_start = GST_CLOCK_TIME_NONE;
GstClockTime last_stop = GST_CLOCK_TIME_NONE;
GstBaseParseClass *klass = GST_BASE_PARSE_GET_CLASS (parse);
GstBuffer *buffer;
gsize size;
g_return_val_if_fail (frame != NULL, GST_FLOW_ERROR);
g_return_val_if_fail (frame->buffer != NULL, GST_FLOW_ERROR);
GST_TRACE_OBJECT (parse, "pushing frame %p", frame);
buffer = frame->buffer;
GST_LOG_OBJECT (parse,
"processing buffer of size %" G_GSIZE_FORMAT " with dts %" GST_TIME_FORMAT
", pts %" GST_TIME_FORMAT ", duration %" GST_TIME_FORMAT,
gst_buffer_get_size (buffer),
GST_TIME_ARGS (GST_BUFFER_DTS (buffer)),
GST_TIME_ARGS (GST_BUFFER_PTS (buffer)),
GST_TIME_ARGS (GST_BUFFER_DURATION (buffer)));
/* update stats */
parse->priv->bytecount += frame->size;
if (G_LIKELY (!(frame->flags & GST_BASE_PARSE_FRAME_FLAG_NO_FRAME))) {
parse->priv->framecount++;
if (GST_BUFFER_DURATION_IS_VALID (buffer)) {
parse->priv->acc_duration += GST_BUFFER_DURATION (buffer);
}
}
/* 0 means disabled */
if (parse->priv->update_interval < 0)
parse->priv->update_interval = 50;
else if (parse->priv->update_interval > 0 &&
(parse->priv->framecount % parse->priv->update_interval) == 0)
gst_base_parse_update_duration (parse);
if (GST_BUFFER_PTS_IS_VALID (buffer))
last_start = last_stop = GST_BUFFER_PTS (buffer);
if (last_start != GST_CLOCK_TIME_NONE
&& GST_BUFFER_DURATION_IS_VALID (buffer))
last_stop = last_start + GST_BUFFER_DURATION (buffer);
/* should have caps by now */
if (!gst_pad_has_current_caps (parse->srcpad))
goto no_caps;
if (G_UNLIKELY (!parse->priv->checked_media)) {
/* have caps; check identity */
gst_base_parse_check_media (parse);
}
if (parse->priv->tags_changed) {
gst_base_parse_queue_tag_event_update (parse);
parse->priv->tags_changed = FALSE;
}
/* Push pending events, including SEGMENT events */
gst_base_parse_push_pending_events (parse);
/* segment adjustment magic; only if we are running the whole show */
if (!parse->priv->passthrough && parse->segment.rate > 0.0 &&
(parse->priv->pad_mode == GST_PAD_MODE_PULL ||
parse->priv->upstream_seekable)) {
/* handle gaps */
if (GST_CLOCK_TIME_IS_VALID (parse->segment.position) &&
GST_CLOCK_TIME_IS_VALID (last_start)) {
GstClockTimeDiff diff;
/* only send newsegments with increasing start times,
* otherwise if these go back and forth downstream (sinks) increase
* accumulated time and running_time */
diff = GST_CLOCK_DIFF (parse->segment.position, last_start);
if (G_UNLIKELY (diff > 2 * GST_SECOND
&& last_start > parse->segment.start
&& (!GST_CLOCK_TIME_IS_VALID (parse->segment.stop)
|| last_start < parse->segment.stop))) {
GST_DEBUG_OBJECT (parse,
"Gap of %" G_GINT64_FORMAT " ns detected in stream " "(%"
GST_TIME_FORMAT " -> %" GST_TIME_FORMAT "). "
"Sending updated SEGMENT events", diff,
GST_TIME_ARGS (parse->segment.position),
GST_TIME_ARGS (last_start));
/* skip gap FIXME */
gst_pad_push_event (parse->srcpad,
gst_event_new_segment (&parse->segment));
parse->segment.position = last_start;
}
}
}
/* update bitrates and optionally post corresponding tags
* (following newsegment) */
gst_base_parse_update_bitrates (parse, frame);
if (klass->pre_push_frame) {
ret = klass->pre_push_frame (parse, frame);
} else {
frame->flags |= GST_BASE_PARSE_FRAME_FLAG_CLIP;
}
/* Push pending events, if there are any new ones
* like tags added by pre_push_frame */
if (parse->priv->tags_changed) {
gst_base_parse_queue_tag_event_update (parse);
parse->priv->tags_changed = FALSE;
}
gst_base_parse_push_pending_events (parse);
/* take final ownership of frame buffer */
if (frame->out_buffer) {
buffer = frame->out_buffer;
frame->out_buffer = NULL;
gst_buffer_replace (&frame->buffer, NULL);
} else {
buffer = frame->buffer;
frame->buffer = NULL;
}
/* subclass must play nice */
g_return_val_if_fail (buffer != NULL, GST_FLOW_ERROR);
size = gst_buffer_get_size (buffer);
parse->priv->seen_keyframe |= parse->priv->is_video &&
!GST_BUFFER_FLAG_IS_SET (buffer, GST_BUFFER_FLAG_DELTA_UNIT);
if (frame->flags & GST_BASE_PARSE_FRAME_FLAG_CLIP) {
if (GST_BUFFER_TIMESTAMP_IS_VALID (buffer) &&
GST_CLOCK_TIME_IS_VALID (parse->segment.stop) &&
GST_BUFFER_TIMESTAMP (buffer) >
parse->segment.stop + parse->priv->lead_out_ts) {
GST_LOG_OBJECT (parse, "Dropped frame, after segment");
ret = GST_FLOW_EOS;
} 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->priv->lead_in_ts < parse->segment.start) {
if (parse->priv->seen_keyframe) {
GST_LOG_OBJECT (parse, "Frame before segment, after keyframe");
ret = GST_FLOW_OK;
} else {
GST_LOG_OBJECT (parse, "Dropped frame, before segment");
ret = GST_BASE_PARSE_FLOW_DROPPED;
}
} else {
ret = GST_FLOW_OK;
}
}
if (ret == GST_BASE_PARSE_FLOW_DROPPED) {
GST_LOG_OBJECT (parse, "frame (%" G_GSIZE_FORMAT " bytes) dropped", size);
gst_buffer_unref (buffer);
ret = GST_FLOW_OK;
} else if (ret == GST_FLOW_OK) {
if (parse->segment.rate > 0.0) {
GST_LOG_OBJECT (parse, "pushing frame (%" G_GSIZE_FORMAT " bytes) now..",
size);
ret = gst_pad_push (parse->srcpad, buffer);
GST_LOG_OBJECT (parse, "frame pushed, flow %s", gst_flow_get_name (ret));
} else if (!parse->priv->disable_passthrough && parse->priv->passthrough) {
/* in backwards playback mode, if on passthrough we need to push buffers
* directly without accumulating them into the buffers_queued as baseparse
* will never check for a DISCONT while on passthrough and those buffers
* will never be pushed.
*
* also, as we are on reverse playback, it might be possible that
* passthrough might have just been enabled, so make sure to drain the
* buffers_queued list */
if (G_UNLIKELY (parse->priv->buffers_queued != NULL)) {
gst_base_parse_finish_fragment (parse, TRUE);
ret = gst_base_parse_send_buffers (parse);
}
if (ret == GST_FLOW_OK) {
GST_LOG_OBJECT (parse,
"pushing frame (%" G_GSIZE_FORMAT " bytes) now..", size);
ret = gst_pad_push (parse->srcpad, buffer);
GST_LOG_OBJECT (parse, "frame pushed, flow %s",
gst_flow_get_name (ret));
} else {
GST_LOG_OBJECT (parse,
"frame (%" G_GSIZE_FORMAT " bytes) not pushed: %s", size,
gst_flow_get_name (ret));
gst_buffer_unref (buffer);
}
} else {
GST_LOG_OBJECT (parse, "frame (%" G_GSIZE_FORMAT " bytes) queued for now",
size);
parse->priv->buffers_queued =
g_slist_prepend (parse->priv->buffers_queued, buffer);
ret = GST_FLOW_OK;
}
} else {
GST_LOG_OBJECT (parse, "frame (%" G_GSIZE_FORMAT " bytes) not pushed: %s",
size, gst_flow_get_name (ret));
gst_buffer_unref (buffer);
/* if we are not sufficiently in control, let upstream decide on EOS */
if (ret == GST_FLOW_EOS && !parse->priv->disable_passthrough &&
(parse->priv->passthrough ||
(parse->priv->pad_mode == GST_PAD_MODE_PUSH &&
!parse->priv->upstream_seekable)))
ret = GST_FLOW_OK;
}
/* Update current running segment position */
if ((ret == GST_FLOW_OK || ret == GST_FLOW_NOT_LINKED)
&& last_stop != GST_CLOCK_TIME_NONE
&& parse->segment.position < last_stop)
parse->segment.position = last_stop;
return ret;
/* ERRORS */
no_caps:
{
if (GST_PAD_IS_FLUSHING (parse->srcpad))
return GST_FLOW_FLUSHING;
GST_ELEMENT_ERROR (parse, STREAM, DECODE, ("No caps set"), (NULL));
return GST_FLOW_ERROR;
}
}
/**
* gst_base_parse_finish_frame:
* @parse: a #GstBaseParse
* @frame: a #GstBaseParseFrame
* @size: consumed input data represented by frame
*
* Collects parsed data and pushes this downstream.
* Source pad caps must be set when this is called.
*
* If @frame's out_buffer is set, that will be used as subsequent frame data.
* Otherwise, @size samples will be taken from the input and used for output,
* and the output's metadata (timestamps etc) will be taken as (optionally)
* set by the subclass on @frame's (input) buffer (which is otherwise
* ignored for any but the above purpose/information).
*
* Note that the latter buffer is invalidated by this call, whereas the
* caller retains ownership of @frame.
*
* Returns: a #GstFlowReturn that should be escalated to caller (of caller)
*/
GstFlowReturn
gst_base_parse_finish_frame (GstBaseParse * parse, GstBaseParseFrame * frame,
gint size)
{
GstFlowReturn ret = GST_FLOW_OK;
g_return_val_if_fail (frame != NULL, GST_FLOW_ERROR);
g_return_val_if_fail (frame->buffer != NULL, GST_FLOW_ERROR);
g_return_val_if_fail (size > 0 || frame->out_buffer, GST_FLOW_ERROR);
g_return_val_if_fail (gst_adapter_available (parse->priv->adapter) >= size,
GST_FLOW_ERROR);
GST_LOG_OBJECT (parse, "finished frame at offset %" G_GUINT64_FORMAT ", "
"flushing size %d", frame->offset, size);
/* some one-time start-up */
if (G_UNLIKELY (parse->priv->framecount == 0)) {
gst_base_parse_check_seekability (parse);
gst_base_parse_check_upstream (parse);
}
parse->priv->flushed += size;
if (parse->priv->scanning && frame->buffer) {
if (!parse->priv->scanned_frame) {
parse->priv->scanned_frame = gst_base_parse_frame_copy (frame);
}
goto exit;
}
/* either PUSH or PULL mode arranges for adapter data */
/* ensure output buffer */
if (!frame->out_buffer) {
GstBuffer *src, *dest;
frame->out_buffer = gst_adapter_take_buffer (parse->priv->adapter, size);
dest = frame->out_buffer;
src = frame->buffer;
GST_BUFFER_PTS (dest) = GST_BUFFER_PTS (src);
GST_BUFFER_DTS (dest) = GST_BUFFER_DTS (src);
GST_BUFFER_OFFSET (dest) = GST_BUFFER_OFFSET (src);
GST_BUFFER_DURATION (dest) = GST_BUFFER_DURATION (src);
GST_BUFFER_OFFSET_END (dest) = GST_BUFFER_OFFSET_END (src);
GST_MINI_OBJECT_FLAGS (dest) = GST_MINI_OBJECT_FLAGS (src);
} else {
gst_adapter_flush (parse->priv->adapter, size);
}
/* use as input for subsequent processing */
gst_buffer_replace (&frame->buffer, frame->out_buffer);
gst_buffer_unref (frame->out_buffer);
frame->out_buffer = NULL;
/* mark input size consumed */
frame->size = size;
/* subclass might queue frames/data internally if it needs more
* frames to decide on the format, or might request us to queue here. */
if (frame->flags & GST_BASE_PARSE_FRAME_FLAG_DROP) {
gst_buffer_replace (&frame->buffer, NULL);
goto exit;
} else if (frame->flags & GST_BASE_PARSE_FRAME_FLAG_QUEUE) {
GstBaseParseFrame *copy;
copy = gst_base_parse_frame_copy (frame);
copy->flags &= ~GST_BASE_PARSE_FRAME_FLAG_QUEUE;
gst_base_parse_queue_frame (parse, copy);
goto exit;
}
ret = gst_base_parse_handle_and_push_frame (parse, frame);
exit:
return ret;
}
/* gst_base_parse_drain:
*
* 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");
parse->priv->drain = TRUE;
for (;;) {
avail = gst_adapter_available (parse->priv->adapter);
if (!avail)
break;
if (gst_base_parse_chain (parse->sinkpad, GST_OBJECT_CAST (parse),
NULL) != GST_FLOW_OK) {
break;
}
/* nothing changed, maybe due to truncated frame; break infinite loop */
if (avail == gst_adapter_available (parse->priv->adapter)) {
GST_DEBUG_OBJECT (parse, "no change during draining; flushing");
gst_adapter_clear (parse->priv->adapter);
}
}
parse->priv->drain = FALSE;
}
/* gst_base_parse_send_buffers
*
* Sends buffers collected in send_buffers downstream, and ensures that list
* is empty at the end (errors or not).
*/
static GstFlowReturn
gst_base_parse_send_buffers (GstBaseParse * parse)
{
GSList *send = NULL;
GstBuffer *buf;
GstFlowReturn ret = GST_FLOW_OK;
gboolean first = TRUE;
send = parse->priv->buffers_send;
/* send buffers */
while (send) {
buf = GST_BUFFER_CAST (send->data);
GST_LOG_OBJECT (parse, "pushing buffer %p, dts %"
GST_TIME_FORMAT ", pts %" GST_TIME_FORMAT ", duration %" GST_TIME_FORMAT
", offset %" G_GINT64_FORMAT, buf,
GST_TIME_ARGS (GST_BUFFER_DTS (buf)),
GST_TIME_ARGS (GST_BUFFER_PTS (buf)),
GST_TIME_ARGS (GST_BUFFER_DURATION (buf)), GST_BUFFER_OFFSET (buf));
/* Make sure the first buffer is always DISCONT. If we split
* GOPs inside the parser this is otherwise not guaranteed */
if (first) {
GST_BUFFER_FLAG_SET (buf, GST_BUFFER_FLAG_DISCONT);
first = FALSE;
}
/* iterate output queue an push downstream */
ret = gst_pad_push (parse->srcpad, buf);
send = g_slist_delete_link (send, send);
/* clear any leftover if error */
if (G_UNLIKELY (ret != GST_FLOW_OK)) {
while (send) {
buf = GST_BUFFER_CAST (send->data);
gst_buffer_unref (buf);
send = g_slist_delete_link (send, send);
}
}
}
parse->priv->buffers_send = send;
return ret;
}
/* gst_base_parse_start_fragment:
*
* Prepares for processing a reverse playback (forward) fragment
* by (re)setting proper state variables.
*/
static GstFlowReturn
gst_base_parse_start_fragment (GstBaseParse * parse)
{
GST_LOG_OBJECT (parse, "starting fragment");
/* invalidate so no fall-back timestamping is performed;
* ok if taken from subclass or upstream */
parse->priv->next_pts = GST_CLOCK_TIME_NONE;
parse->priv->prev_pts = GST_CLOCK_TIME_NONE;
parse->priv->next_dts = GST_CLOCK_TIME_NONE;
parse->priv->prev_dts = GST_CLOCK_TIME_NONE;
parse->priv->prev_dts_from_pts = FALSE;
/* prevent it hanging around stop all the time */
parse->segment.position = GST_CLOCK_TIME_NONE;
/* mark next run */
parse->priv->discont = TRUE;
/* head of previous fragment is now pending tail of current fragment */
parse->priv->buffers_pending = parse->priv->buffers_head;
parse->priv->buffers_head = NULL;
return GST_FLOW_OK;
}
/* gst_base_parse_finish_fragment:
*
* Processes a reverse playback (forward) fragment:
* - append head of last fragment that was skipped to current fragment data
* - drain the resulting current fragment data (i.e. repeated chain)
* - add time/duration (if needed) to frames queued by chain
* - push queued data
*/
static GstFlowReturn
gst_base_parse_finish_fragment (GstBaseParse * parse, gboolean prev_head)
{
GstBuffer *buf;
GstFlowReturn ret = GST_FLOW_OK;
gboolean seen_key = FALSE, seen_delta = FALSE;