mirrors/gstreamer
mirrors/gstreamer
1
1
Fork 0
mirror of https://gitlab.freedesktop.org/gstreamer/gstreamer.git synced 2024-11-05 09:00:54 +00:00
Code Issues 1 Projects Releases Wiki Activity
gstreamer/gst/aacparse/gstbaseparse.c
Mark Nauwelaerts 222322e7f3 baseparse: prevent infinite loop when draining
2009-08-07 13:09:24 +02:00

1783 lines
52 KiB
C
Raw Blame History

/* 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>.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
/**
* SECTION: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>One sinkpad and one srcpad</para></listitem>
* <listitem><para>Handles state changes</para></listitem>
* <listitem><para>Does flushing</para></listitem>
* <listitem><para>Push mode</para></listitem>
* <listitem><para>Pull mode</para></listitem>
* <listitem><para>Handles events (NEWSEGMENT/EOS/FLUSH)</para></listitem>
* <listitem><para>Handles seeking in both modes</para></listitem>
* <listitem><para>
* Handles POSITION/DURATION/SEEKING/FORMAT/CONVERT queries
* </para></listitem>
* </itemizedlist>
*
* The purpose of this base class is to provide a 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 class calls @set_sink_caps to inform the subclass about
* incoming sinkpad caps. Subclass should set the srcpad caps accordingly.
* </para></listitem>
* <listitem><para>
* GstBaseParse calls @start to inform subclass that data processing is
* about to start now.
* </para></listitem>
* <listitem><para>
* At least in 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 into internal
* #GstAdapter.
* </para></listitem>
* <listitem><para>
* A buffer of min_frame_size bytes is passed to subclass with
* @check_valid_frame. Subclass checks the contents and returns TRUE
* if the buffer contains a valid frame. It also needs to set the
* @framesize according to the detected frame size. If buffer didn't
* contain a valid frame, this call must return FALSE and optionally
* set the @skipsize value to inform base class that how many bytes
* it needs to skip in order to find a valid frame. The passed buffer
* is read-only.
* </para></listitem>
* <listitem><para>
* After valid frame is found, it will be passed again to subclass with
* @parse_frame call. Now subclass is responsible for parsing the
* frame contents and setting the buffer timestamp, duration and caps.
* </para></listitem>
* <listitem><para>
* Finally the buffer can be pushed downstream and parsing loop starts
* over again.
* </para></listitem>
* <listitem><para>
* During the parsing process GstBaseClass 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. If
* subclass doesn't provide @convert function, seeking will get disabled.
*
* 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 @check_valid_frame
* and tell if they contain a valid frame
* </para></listitem>
* <listitem><para>
* Set the caps and timestamp to frame that is passed to subclass with
* @parse_frame function.
* </para></listitem>
* <listitem><para>Provide conversion functions</para></listitem>
* <listitem><para>
* Update the duration information with @gst_base_parse_set_duration
* </para></listitem>
* </itemizedlist>
*
*/
/* TODO:
* - Better segment handling:
* - NEWSEGMENT for gaps
* - Not NEWSEGMENT starting at 0 but at first frame timestamp
* - GstIndex support
* - Seek table generation and subclass seek entry injection
* - Accurate seeking
* - In push mode provide a queue of adapter-"queued" buffers for upstream
* buffer metadata
* - Timestamp tracking and setting
* - Handle upstream timestamps
* - Queue buffers/events until caps are set
* - Bitrate tracking => inaccurate seeking, inaccurate duration calculation
* - Let subclass decide if frames outside the segment should be dropped
* - Send queries upstream
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <stdlib.h>
#include <string.h>
#include "gstbaseparse.h"
GST_DEBUG_CATEGORY_STATIC (gst_base_parse_debug);
#define GST_CAT_DEFAULT gst_base_parse_debug
/* Supported formats */
static GstFormat fmtlist[] = {
GST_FORMAT_DEFAULT,
GST_FORMAT_BYTES,
GST_FORMAT_TIME,
0
};
#define GST_BASE_PARSE_GET_PRIVATE(obj) \
(G_TYPE_INSTANCE_GET_PRIVATE ((obj), GST_TYPE_BASE_PARSE, GstBaseParsePrivate))
struct _GstBaseParsePrivate
{
GstActivateMode pad_mode;
gint64 duration;
GstFormat duration_fmt;
guint min_frame_size;
gboolean discont;
gboolean flushing;
gint64 offset;
GList *pending_events;
GstBuffer *cache;
};
struct _GstBaseParseClassPrivate
{
gpointer _padding;
};
static GstElementClass *parent_class = NULL;
static void gst_base_parse_base_init (gpointer g_class);
static void gst_base_parse_base_finalize (gpointer g_class);
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 GType base_parse_type = 0;
if (!base_parse_type) {
static const GTypeInfo base_parse_info = {
sizeof (GstBaseParseClass),
(GBaseInitFunc) gst_base_parse_base_init,
(GBaseFinalizeFunc) gst_base_parse_base_finalize,
(GClassInitFunc) gst_base_parse_class_init,
NULL,
NULL,
sizeof (GstBaseParse),
0,
(GInstanceInitFunc) gst_base_parse_init,
};
base_parse_type = g_type_register_static (GST_TYPE_ELEMENT,
"GstAacBaseParse", &base_parse_info, G_TYPE_FLAG_ABSTRACT);
}
return base_parse_type;
}
static void gst_base_parse_finalize (GObject * object);
static gboolean gst_base_parse_sink_activate (GstPad * sinkpad);
static gboolean gst_base_parse_sink_activate_push (GstPad * pad,
gboolean active);
static gboolean gst_base_parse_sink_activate_pull (GstPad * pad,
gboolean active);
static gboolean gst_base_parse_handle_seek (GstBaseParse * parse,
GstEvent * event);
static gboolean gst_base_parse_src_event (GstPad * pad, GstEvent * event);
static gboolean gst_base_parse_sink_event (GstPad * pad, GstEvent * event);
static gboolean gst_base_parse_query (GstPad * pad, GstQuery * query);
static gboolean gst_base_parse_sink_setcaps (GstPad * pad, GstCaps * caps);
static const GstQueryType *gst_base_parse_get_querytypes (GstPad * pad);
static GstFlowReturn gst_base_parse_chain (GstPad * pad, GstBuffer * buffer);
static void gst_base_parse_loop (GstPad * pad);
static gboolean gst_base_parse_check_frame (GstBaseParse * parse,
GstBuffer * buffer, guint * framesize, gint * skipsize);
static GstFlowReturn gst_base_parse_parse_frame (GstBaseParse * parse,
GstBuffer * buffer);
static gboolean gst_base_parse_sink_eventfunc (GstBaseParse * parse,
GstEvent * event);
static gboolean gst_base_parse_src_eventfunc (GstBaseParse * parse,
GstEvent * event);
static gboolean gst_base_parse_is_seekable (GstBaseParse * parse);
static void gst_base_parse_drain (GstBaseParse * parse);
static void
gst_base_parse_base_init (gpointer g_class)
{
GstBaseParseClass *klass = GST_BASE_PARSE_CLASS (g_class);
GstBaseParseClassPrivate *priv;
GST_DEBUG_CATEGORY_INIT (gst_base_parse_debug, "aacbaseparse", 0,
"baseparse element");
/* TODO: Remove this once GObject supports class private data */
priv = g_slice_new0 (GstBaseParseClassPrivate);
if (klass->priv)
memcpy (priv, klass->priv, sizeof (GstBaseParseClassPrivate));
klass->priv = priv;
}
static void
gst_base_parse_base_finalize (gpointer g_class)
{
GstBaseParseClass *klass = GST_BASE_PARSE_CLASS (g_class);
g_slice_free (GstBaseParseClassPrivate, klass->priv);
klass->priv = NULL;
}
static void
gst_base_parse_finalize (GObject * object)
{
GstBaseParse *parse = GST_BASE_PARSE (object);
g_mutex_free (parse->parse_lock);
g_object_unref (parse->adapter);
if (parse->pending_segment) {
gst_event_replace (&parse->pending_segment, NULL);
}
if (parse->close_segment) {
gst_event_replace (&parse->close_segment, NULL);
}
if (parse->priv->cache) {
gst_buffer_unref (parse->priv->cache);
parse->priv->cache = NULL;
}
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;
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static void
gst_base_parse_class_init (GstBaseParseClass * klass)
{
GObjectClass *gobject_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);
/* Default handlers */
klass->check_valid_frame = gst_base_parse_check_frame;
klass->parse_frame = gst_base_parse_parse_frame;
klass->event = gst_base_parse_sink_eventfunc;
klass->src_event = gst_base_parse_src_eventfunc;
klass->is_seekable = gst_base_parse_is_seekable;
}
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_setcaps_function (parse->sinkpad,
GST_DEBUG_FUNCPTR (gst_base_parse_sink_setcaps));
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_activatepush_function (parse->sinkpad,
GST_DEBUG_FUNCPTR (gst_base_parse_sink_activate_push));
gst_pad_set_activatepull_function (parse->sinkpad,
GST_DEBUG_FUNCPTR (gst_base_parse_sink_activate_pull));
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_type_function (parse->srcpad,
GST_DEBUG_FUNCPTR (gst_base_parse_get_querytypes));
gst_pad_set_query_function (parse->srcpad,
GST_DEBUG_FUNCPTR (gst_base_parse_query));
gst_element_add_pad (GST_ELEMENT (parse), parse->srcpad);
GST_DEBUG_OBJECT (parse, "src created");
parse->parse_lock = g_mutex_new ();
parse->adapter = gst_adapter_new ();
parse->pending_segment = NULL;
parse->close_segment = NULL;
parse->priv->pad_mode = GST_ACTIVATE_NONE;
parse->priv->duration = -1;
parse->priv->min_frame_size = 1;
parse->priv->discont = FALSE;
parse->priv->flushing = FALSE;
parse->priv->offset = 0;
GST_DEBUG_OBJECT (parse, "init ok");
}
/**
* gst_base_parse_check_frame:
* @parse: #GstBaseParse.
* @buffer: GstBuffer.
* @framesize: This will be set to tell the found frame size in bytes.
* @skipsize: Output parameter that tells how much data needs to be skipped
* in order to find the following frame header.
*
* Default callback for check_valid_frame.
*
* Returns: Always TRUE.
*/
static gboolean
gst_base_parse_check_frame (GstBaseParse * parse,
GstBuffer * buffer, guint * framesize, gint * skipsize)
{
*framesize = GST_BUFFER_SIZE (buffer);
*skipsize = 0;
return TRUE;
}
/**
* gst_base_parse_parse_frame:
* @parse: #GstBaseParse.
* @buffer: #GstBuffer.
*
* Default callback for parse_frame.
*/
static GstFlowReturn
gst_base_parse_parse_frame (GstBaseParse * parse, GstBuffer * buffer)
{
/* FIXME: Could we even _try_ to do something clever here? */
GST_BUFFER_TIMESTAMP (buffer) = GST_CLOCK_TIME_NONE;
GST_BUFFER_DURATION (buffer) = GST_CLOCK_TIME_NONE;
return GST_FLOW_OK;
}
/**
* gst_base_parse_bytepos_to_time:
* @parse: #GstBaseParse.
* @bytepos: Position (in bytes) to be converted.
* @pos_in_time: #GstClockTime pointer where the result is set.
*
* Convert given byte position into #GstClockTime format.
*
* Returns: TRUE if conversion succeeded.
*/
static gboolean
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));
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_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);
}
Reference in a new issue View git blame Copy permalink