gstreamer/gst/base/gstbasesrc.c
Wim Taymans 74d0352327 gst/base/gstbasesrc.c: Handle state change failure more correctly.
Original commit message from CVS:
* gst/base/gstbasesrc.c: (gst_base_src_change_state):
Handle state change failure more correctly.
2005-09-19 14:55:26 +00:00

1110 lines
27 KiB
C

/* GStreamer
* Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
* 2000,2005 Wim Taymans <wim@fluendo.com>
*
* gstbasesrc.c:
*
* 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:gstbasesrc
* @short_description: Base class for getrange based source elements
* @see_also: #GstBaseTransformc, #GstBaseSink
*
* This class is mostly useful for elements that do byte based
* access to a random access resource, like files.
* If random access is not possible, the live-mode should be set
* to TRUE.
*
* <itemizedlist>
* <listitem><para>one sinkpad</para></listitem>
* <listitem><para>handles state changes</para></listitem>
* <listitem><para>does flushing</para></listitem>
* <listitem><para>preroll with optional preview</para></listitem>
* <listitem><para>pull/push mode</para></listitem>
* <listitem><para>EOS handling</para></listitem>
* </itemizedlist>
*/
#include <stdlib.h>
#include <string.h>
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include "gstbasesrc.h"
#include "gsttypefindhelper.h"
#include <gst/gstmarshal.h>
#define DEFAULT_BLOCKSIZE 4096
#define DEFAULT_NUM_BUFFERS -1
GST_DEBUG_CATEGORY_STATIC (gst_base_src_debug);
#define GST_CAT_DEFAULT gst_base_src_debug
/* BaseSrc signals and args */
enum
{
/* FILL ME */
LAST_SIGNAL
};
enum
{
PROP_0,
PROP_BLOCKSIZE,
PROP_NUM_BUFFERS,
};
static GstElementClass *parent_class = NULL;
static void gst_base_src_base_init (gpointer g_class);
static void gst_base_src_class_init (GstBaseSrcClass * klass);
static void gst_base_src_init (GstBaseSrc * src, gpointer g_class);
static void gst_base_src_finalize (GObject * object);
GType
gst_base_src_get_type (void)
{
static GType base_src_type = 0;
if (!base_src_type) {
static const GTypeInfo base_src_info = {
sizeof (GstBaseSrcClass),
(GBaseInitFunc) gst_base_src_base_init,
NULL,
(GClassInitFunc) gst_base_src_class_init,
NULL,
NULL,
sizeof (GstBaseSrc),
0,
(GInstanceInitFunc) gst_base_src_init,
};
base_src_type = g_type_register_static (GST_TYPE_ELEMENT,
"GstBaseSrc", &base_src_info, G_TYPE_FLAG_ABSTRACT);
}
return base_src_type;
}
static GstCaps *gst_base_src_getcaps (GstPad * pad);
static gboolean gst_base_src_setcaps (GstPad * pad, GstCaps * caps);
static gboolean gst_base_src_activate_push (GstPad * pad, gboolean active);
static gboolean gst_base_src_activate_pull (GstPad * pad, gboolean active);
static void gst_base_src_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec);
static void gst_base_src_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec);
static gboolean gst_base_src_event_handler (GstPad * pad, GstEvent * event);
static gboolean gst_base_src_query (GstPad * pad, GstQuery * query);
#if 0
static const GstEventMask *gst_base_src_get_event_mask (GstPad * pad);
#endif
static gboolean gst_base_src_default_negotiate (GstBaseSrc * basesrc);
static gboolean gst_base_src_unlock (GstBaseSrc * basesrc);
static gboolean gst_base_src_get_size (GstBaseSrc * basesrc, guint64 * size);
static gboolean gst_base_src_start (GstBaseSrc * basesrc);
static gboolean gst_base_src_stop (GstBaseSrc * basesrc);
static GstStateChangeReturn gst_base_src_change_state (GstElement * element,
GstStateChange transition);
static void gst_base_src_loop (GstPad * pad);
static gboolean gst_base_src_check_get_range (GstPad * pad);
static GstFlowReturn gst_base_src_get_range (GstPad * pad, guint64 offset,
guint length, GstBuffer ** buf);
static void
gst_base_src_base_init (gpointer g_class)
{
GST_DEBUG_CATEGORY_INIT (gst_base_src_debug, "basesrc", 0, "basesrc element");
}
static void
gst_base_src_class_init (GstBaseSrcClass * klass)
{
GObjectClass *gobject_class;
GstElementClass *gstelement_class;
gobject_class = (GObjectClass *) klass;
gstelement_class = (GstElementClass *) klass;
parent_class = g_type_class_ref (GST_TYPE_ELEMENT);
gobject_class->finalize = GST_DEBUG_FUNCPTR (gst_base_src_finalize);
gobject_class->set_property = GST_DEBUG_FUNCPTR (gst_base_src_set_property);
gobject_class->get_property = GST_DEBUG_FUNCPTR (gst_base_src_get_property);
g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_BLOCKSIZE,
g_param_spec_ulong ("blocksize", "Block size",
"Size in bytes to read per buffer", 1, G_MAXULONG, DEFAULT_BLOCKSIZE,
G_PARAM_READWRITE));
g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_NUM_BUFFERS,
g_param_spec_int ("num-buffers", "num-buffers",
"Number of buffers to output before sending EOS", -1, G_MAXINT,
DEFAULT_NUM_BUFFERS, G_PARAM_READWRITE));
gstelement_class->change_state =
GST_DEBUG_FUNCPTR (gst_base_src_change_state);
klass->negotiate = gst_base_src_default_negotiate;
}
static void
gst_base_src_init (GstBaseSrc * basesrc, gpointer g_class)
{
GstPad *pad;
GstPadTemplate *pad_template;
basesrc->is_live = FALSE;
basesrc->live_lock = g_mutex_new ();
basesrc->live_cond = g_cond_new ();
basesrc->num_buffers = DEFAULT_NUM_BUFFERS;
basesrc->num_buffers_left = -1;
basesrc->can_activate_push = TRUE;
basesrc->pad_mode = GST_ACTIVATE_NONE;
pad_template =
gst_element_class_get_pad_template (GST_ELEMENT_CLASS (g_class), "src");
g_return_if_fail (pad_template != NULL);
pad = gst_pad_new_from_template (pad_template, "src");
gst_pad_set_activatepush_function (pad, gst_base_src_activate_push);
gst_pad_set_activatepull_function (pad, gst_base_src_activate_pull);
gst_pad_set_event_function (pad, gst_base_src_event_handler);
gst_pad_set_query_function (pad, gst_base_src_query);
gst_pad_set_checkgetrange_function (pad, gst_base_src_check_get_range);
gst_pad_set_getrange_function (pad, gst_base_src_get_range);
gst_pad_set_getcaps_function (pad, gst_base_src_getcaps);
gst_pad_set_setcaps_function (pad, gst_base_src_setcaps);
/* hold ref to pad */
basesrc->srcpad = pad;
gst_element_add_pad (GST_ELEMENT (basesrc), pad);
basesrc->segment_start = -1;
basesrc->segment_end = -1;
basesrc->need_discont = TRUE;
basesrc->blocksize = DEFAULT_BLOCKSIZE;
basesrc->clock_id = NULL;
GST_FLAG_UNSET (basesrc, GST_BASE_SRC_STARTED);
}
static void
gst_base_src_finalize (GObject * object)
{
GstBaseSrc *basesrc;
basesrc = GST_BASE_SRC (object);
g_mutex_free (basesrc->live_lock);
g_cond_free (basesrc->live_cond);
G_OBJECT_CLASS (parent_class)->finalize (object);
}
/**
* gst_base_src_set_live:
* @src: base source instance
* @live: new live-mode
*
* If the element listens to a live source, the @livemode should
* be set to %TRUE. This declares that this source can't seek.
*/
void
gst_base_src_set_live (GstBaseSrc * src, gboolean live)
{
GST_LIVE_LOCK (src);
src->is_live = live;
GST_LIVE_UNLOCK (src);
}
/**
* gst_base_src_is_live:
* @src: base source instance
*
* Check if an element is in live mode.
*
* Returns: %TRUE if element is in live mode.
*/
gboolean
gst_base_src_is_live (GstBaseSrc * src)
{
gboolean result;
GST_LIVE_LOCK (src);
result = src->is_live;
GST_LIVE_UNLOCK (src);
return result;
}
static gboolean
gst_base_src_setcaps (GstPad * pad, GstCaps * caps)
{
GstBaseSrcClass *bclass;
GstBaseSrc *bsrc;
gboolean res = TRUE;
bsrc = GST_BASE_SRC (GST_PAD_PARENT (pad));
bclass = GST_BASE_SRC_GET_CLASS (bsrc);
if (bclass->set_caps)
res = bclass->set_caps (bsrc, caps);
return res;
}
static GstCaps *
gst_base_src_getcaps (GstPad * pad)
{
GstBaseSrcClass *bclass;
GstBaseSrc *bsrc;
GstCaps *caps = NULL;
bsrc = GST_BASE_SRC (GST_PAD_PARENT (pad));
bclass = GST_BASE_SRC_GET_CLASS (bsrc);
if (bclass->get_caps)
caps = bclass->get_caps (bsrc);
if (caps == NULL) {
GstPadTemplate *pad_template;
pad_template =
gst_element_class_get_pad_template (GST_ELEMENT_CLASS (bclass), "src");
if (pad_template != NULL) {
caps = gst_caps_ref (gst_pad_template_get_caps (pad_template));
}
}
return caps;
}
static gboolean
gst_base_src_query (GstPad * pad, GstQuery * query)
{
gboolean b;
guint64 ui64;
gint64 i64;
GstBaseSrc *src;
src = GST_BASE_SRC (GST_PAD_PARENT (pad));
switch (GST_QUERY_TYPE (query)) {
case GST_QUERY_POSITION:
{
GstFormat format;
gst_query_parse_position (query, &format, NULL, NULL);
switch (format) {
case GST_FORMAT_DEFAULT:
case GST_FORMAT_BYTES:
b = gst_base_src_get_size (src, &ui64);
/* better to make get_size take an int64 */
i64 = b ? (gint64) ui64 : -1;
gst_query_set_position (query, GST_FORMAT_BYTES, src->offset, i64);
return TRUE;
case GST_FORMAT_PERCENT:
b = gst_base_src_get_size (src, &ui64);
i64 = GST_FORMAT_PERCENT_MAX;
i64 *= b ? (src->offset / (gdouble) ui64) : 1.0;
gst_query_set_position (query, GST_FORMAT_PERCENT,
i64, GST_FORMAT_PERCENT_MAX);
return TRUE;
default:
return FALSE;
}
}
case GST_QUERY_SEEKING:
gst_query_set_seeking (query, GST_FORMAT_BYTES,
src->seekable, src->segment_start, src->segment_end);
return TRUE;
case GST_QUERY_FORMATS:
gst_query_set_formats (query, 3, GST_FORMAT_DEFAULT,
GST_FORMAT_BYTES, GST_FORMAT_PERCENT);
return TRUE;
case GST_QUERY_LATENCY:
case GST_QUERY_JITTER:
case GST_QUERY_RATE:
case GST_QUERY_CONVERT:
default:
return gst_pad_query_default (pad, query);
}
}
static gboolean
gst_base_src_send_discont (GstBaseSrc * src)
{
GstEvent *event;
GST_DEBUG_OBJECT (src, "Sending newsegment from %" G_GINT64_FORMAT
" to %" G_GINT64_FORMAT, (gint64) src->segment_start,
(gint64) src->segment_end);
event = gst_event_new_newsegment (1.0,
GST_FORMAT_BYTES,
(gint64) src->segment_start, (gint64) src->segment_end, (gint64) 0);
return gst_pad_push_event (src->srcpad, event);
}
static gboolean
gst_base_src_do_seek (GstBaseSrc * src, GstEvent * event)
{
gdouble rate;
GstFormat format;
GstSeekFlags flags;
GstSeekType cur_type, stop_type;
gint64 cur, stop;
gst_event_parse_seek (event, &rate, &format, &flags,
&cur_type, &cur, &stop_type, &stop);
/* get seek format */
if (format == GST_FORMAT_DEFAULT)
format = GST_FORMAT_BYTES;
/* we can only seek bytes */
if (format != GST_FORMAT_BYTES)
return FALSE;
/* get seek positions */
src->segment_loop = flags & GST_SEEK_FLAG_SEGMENT;
/* send flush start */
gst_pad_push_event (src->srcpad, gst_event_new_flush_start ());
/* unblock streaming thread */
gst_base_src_unlock (src);
/* grab streaming lock */
GST_STREAM_LOCK (src->srcpad);
/* send flush stop */
gst_pad_push_event (src->srcpad, gst_event_new_flush_stop ());
/* perform the seek */
switch (cur_type) {
case GST_SEEK_TYPE_NONE:
break;
case GST_SEEK_TYPE_SET:
if (cur < 0)
goto error;
src->offset = MIN (cur, src->size);
src->segment_start = src->offset;
break;
case GST_SEEK_TYPE_CUR:
src->offset = CLAMP (src->offset + cur, 0, src->size);
src->segment_start = src->offset;
break;
case GST_SEEK_TYPE_END:
if (cur > 0)
goto error;
src->offset = MAX (0, src->size + cur);
src->segment_start = src->offset;
break;
default:
goto error;
}
switch (stop_type) {
case GST_SEEK_TYPE_NONE:
break;
case GST_SEEK_TYPE_SET:
if (stop < 0)
goto error;
src->segment_end = MIN (stop, src->size);
break;
case GST_SEEK_TYPE_CUR:
src->segment_end = CLAMP (src->segment_end + stop, 0, src->size);
break;
case GST_SEEK_TYPE_END:
if (stop > 0)
goto error;
src->segment_end = src->size + stop;
break;
default:
goto error;
}
GST_DEBUG_OBJECT (src, "seek pending for segment from %" G_GINT64_FORMAT
" to %" G_GINT64_FORMAT, src->segment_start, src->segment_end);
/* now make sure the discont will be send */
src->need_discont = TRUE;
/* and restart the task */
gst_pad_start_task (src->srcpad, (GstTaskFunction) gst_base_src_loop,
src->srcpad);
GST_STREAM_UNLOCK (src->srcpad);
gst_event_unref (event);
return TRUE;
/* ERROR */
error:
{
GST_DEBUG_OBJECT (src, "seek error");
GST_STREAM_UNLOCK (src->srcpad);
gst_event_unref (event);
return FALSE;
}
}
static gboolean
gst_base_src_event_handler (GstPad * pad, GstEvent * event)
{
GstBaseSrc *src;
GstBaseSrcClass *bclass;
gboolean result;
src = GST_BASE_SRC (GST_PAD_PARENT (pad));
bclass = GST_BASE_SRC_GET_CLASS (src);
if (bclass->event)
result = bclass->event (src, event);
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_SEEK:
if (!src->seekable) {
gst_event_unref (event);
return FALSE;
}
return gst_base_src_do_seek (src, event);
case GST_EVENT_FLUSH_START:
/* cancel any blocking getrange */
gst_base_src_unlock (src);
break;
case GST_EVENT_FLUSH_STOP:
break;
default:
break;
}
gst_event_unref (event);
return TRUE;
}
static void
gst_base_src_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
GstBaseSrc *src;
src = GST_BASE_SRC (object);
switch (prop_id) {
case PROP_BLOCKSIZE:
src->blocksize = g_value_get_ulong (value);
break;
case PROP_NUM_BUFFERS:
src->num_buffers = g_value_get_int (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_base_src_get_property (GObject * object, guint prop_id, GValue * value,
GParamSpec * pspec)
{
GstBaseSrc *src;
src = GST_BASE_SRC (object);
switch (prop_id) {
case PROP_BLOCKSIZE:
g_value_set_ulong (value, src->blocksize);
break;
case PROP_NUM_BUFFERS:
g_value_set_int (value, src->num_buffers);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static GstFlowReturn
gst_base_src_get_range (GstPad * pad, guint64 offset, guint length,
GstBuffer ** buf)
{
GstFlowReturn ret;
GstBaseSrc *src;
GstBaseSrcClass *bclass;
src = GST_BASE_SRC (GST_OBJECT_PARENT (pad));
bclass = GST_BASE_SRC_GET_CLASS (src);
GST_LIVE_LOCK (src);
if (src->is_live) {
while (!src->live_running) {
GST_DEBUG ("live source signal waiting");
GST_LIVE_SIGNAL (src);
GST_DEBUG ("live source waiting for running state");
GST_LIVE_WAIT (src);
GST_DEBUG ("live source unlocked");
}
}
GST_LIVE_UNLOCK (src);
GST_LOCK (pad);
if (GST_PAD_IS_FLUSHING (pad))
goto flushing;
GST_UNLOCK (pad);
if (!GST_FLAG_IS_SET (src, GST_BASE_SRC_STARTED))
goto not_started;
if (!bclass->create)
goto no_function;
/* check size */
if (src->size != -1) {
if (offset > src->size)
goto unexpected_length;
if (offset + length > src->size) {
if (bclass->get_size)
bclass->get_size (src, &src->size);
if (offset + length > src->size) {
length = src->size - offset;
}
}
}
if (length == 0)
goto unexpected_length;
if (src->num_buffers_left == 0) {
goto reached_num_buffers;
} else {
if (src->num_buffers_left > 0)
src->num_buffers_left--;
}
ret = bclass->create (src, offset, length, buf);
return ret;
/* ERROR */
flushing:
{
GST_DEBUG_OBJECT (src, "pad is flushing");
GST_UNLOCK (pad);
return GST_FLOW_WRONG_STATE;
}
not_started:
{
GST_DEBUG_OBJECT (src, "getrange but not started");
return GST_FLOW_WRONG_STATE;
}
no_function:
{
GST_DEBUG_OBJECT (src, "no create function");
return GST_FLOW_ERROR;
}
unexpected_length:
{
GST_DEBUG_OBJECT (src, "unexpected length %u", length);
return GST_FLOW_UNEXPECTED;
}
reached_num_buffers:
{
GST_DEBUG_OBJECT (src, "sent all buffers");
return GST_FLOW_UNEXPECTED;
}
}
static gboolean
gst_base_src_check_get_range (GstPad * pad)
{
GstBaseSrc *src;
src = GST_BASE_SRC (GST_OBJECT_PARENT (pad));
if (!GST_FLAG_IS_SET (src, GST_BASE_SRC_STARTED)) {
gst_base_src_start (src);
gst_base_src_stop (src);
}
return src->seekable;
}
static void
gst_base_src_loop (GstPad * pad)
{
GstBaseSrc *src;
GstBuffer *buf = NULL;
GstFlowReturn ret;
src = GST_BASE_SRC (GST_OBJECT_PARENT (pad));
if (src->need_discont) {
/* now send discont */
gst_base_src_send_discont (src);
src->need_discont = FALSE;
}
ret = gst_base_src_get_range (pad, src->offset, src->blocksize, &buf);
if (ret != GST_FLOW_OK)
goto eos;
if (buf == NULL)
goto error;
src->offset += GST_BUFFER_SIZE (buf);
ret = gst_pad_push (pad, buf);
if (ret != GST_FLOW_OK)
goto pause;
return;
eos:
{
GST_DEBUG_OBJECT (src, "going to EOS");
gst_pad_pause_task (pad);
gst_pad_push_event (pad, gst_event_new_eos ());
return;
}
pause:
{
GST_DEBUG_OBJECT (src, "pausing task");
gst_pad_pause_task (pad);
if (GST_FLOW_IS_FATAL (ret) || ret == GST_FLOW_NOT_LINKED) {
/* for fatal errors we post an error message */
GST_ELEMENT_ERROR (src, STREAM, STOPPED,
("streaming stopped, reason %s", gst_flow_get_name (ret)),
("streaming stopped, reason %s", gst_flow_get_name (ret)));
gst_pad_push_event (pad, gst_event_new_eos ());
}
return;
}
error:
{
GST_ELEMENT_ERROR (src, STREAM, STOPPED,
("internal: element returned NULL buffer"),
("internal: element returned NULL buffer"));
gst_pad_pause_task (pad);
gst_pad_push_event (pad, gst_event_new_eos ());
return;
}
}
static gboolean
gst_base_src_unlock (GstBaseSrc * basesrc)
{
GstBaseSrcClass *bclass;
gboolean result = FALSE;
GST_DEBUG ("unlock");
/* unblock whatever the subclass is doing */
bclass = GST_BASE_SRC_GET_CLASS (basesrc);
if (bclass->unlock)
result = bclass->unlock (basesrc);
GST_DEBUG ("unschedule clock");
/* and unblock the clock as well, if any */
GST_LOCK (basesrc);
if (basesrc->clock_id) {
gst_clock_id_unschedule (basesrc->clock_id);
}
GST_UNLOCK (basesrc);
GST_DEBUG ("unlock done");
return result;
}
static gboolean
gst_base_src_get_size (GstBaseSrc * basesrc, guint64 * size)
{
GstBaseSrcClass *bclass;
gboolean result = FALSE;
bclass = GST_BASE_SRC_GET_CLASS (basesrc);
if (bclass->get_size)
result = bclass->get_size (basesrc, size);
if (result)
basesrc->size = *size;
return result;
}
static gboolean
gst_base_src_is_seekable (GstBaseSrc * basesrc)
{
GstBaseSrcClass *bclass;
bclass = GST_BASE_SRC_GET_CLASS (basesrc);
/* check if we can seek */
if (bclass->is_seekable)
basesrc->seekable = bclass->is_seekable (basesrc);
else
basesrc->seekable = FALSE;
return basesrc->seekable;
}
static gboolean
gst_base_src_default_negotiate (GstBaseSrc * basesrc)
{
GstCaps *thiscaps;
GstCaps *caps = NULL;
GstCaps *peercaps = NULL;
gboolean result = FALSE;
thiscaps = gst_pad_get_caps (GST_BASE_SRC_PAD (basesrc));
GST_DEBUG ("caps of src: %" GST_PTR_FORMAT, thiscaps);
if (thiscaps == NULL || gst_caps_is_any (thiscaps))
goto no_nego_needed;
peercaps = gst_pad_peer_get_caps (GST_BASE_SRC_PAD (basesrc));
GST_DEBUG ("caps of peer: %" GST_PTR_FORMAT, peercaps);
if (peercaps) {
GstCaps *icaps;
icaps = gst_caps_intersect (thiscaps, peercaps);
GST_DEBUG ("intersect: %" GST_PTR_FORMAT, icaps);
gst_caps_unref (thiscaps);
gst_caps_unref (peercaps);
if (icaps) {
caps = gst_caps_copy_nth (icaps, 0);
gst_caps_unref (icaps);
}
} else {
caps = thiscaps;
}
if (caps) {
caps = gst_caps_make_writable (caps);
gst_caps_truncate (caps);
gst_pad_fixate_caps (GST_BASE_SRC_PAD (basesrc), caps);
GST_DEBUG ("fixated to: %" GST_PTR_FORMAT, caps);
if (gst_caps_is_any (caps)) {
gst_caps_unref (caps);
result = TRUE;
} else if (gst_caps_is_fixed (caps)) {
gst_pad_set_caps (GST_BASE_SRC_PAD (basesrc), caps);
gst_caps_unref (caps);
result = TRUE;
}
}
return result;
no_nego_needed:
{
GST_DEBUG ("no negotiation needed");
if (thiscaps)
gst_caps_unref (thiscaps);
return TRUE;
}
}
static gboolean
gst_base_src_negotiate (GstBaseSrc * basesrc)
{
GstBaseSrcClass *bclass;
gboolean result = TRUE;
bclass = GST_BASE_SRC_GET_CLASS (basesrc);
if (bclass->negotiate)
result = bclass->negotiate (basesrc);
return result;
}
static gboolean
gst_base_src_start (GstBaseSrc * basesrc)
{
GstBaseSrcClass *bclass;
gboolean result;
if (GST_FLAG_IS_SET (basesrc, GST_BASE_SRC_STARTED))
return TRUE;
GST_DEBUG_OBJECT (basesrc, "starting source");
basesrc->num_buffers_left = basesrc->num_buffers;
bclass = GST_BASE_SRC_GET_CLASS (basesrc);
if (bclass->start)
result = bclass->start (basesrc);
else
result = TRUE;
if (!result)
goto could_not_start;
GST_FLAG_SET (basesrc, GST_BASE_SRC_STARTED);
/* start in the beginning */
basesrc->offset = 0;
/* figure out the size */
if (bclass->get_size) {
result = bclass->get_size (basesrc, &basesrc->size);
if (result == FALSE)
basesrc->size = -1;
} else {
result = FALSE;
basesrc->size = -1;
}
GST_DEBUG ("size %d %lld", result, basesrc->size);
/* we always run to the end */
basesrc->segment_start = 0;
basesrc->segment_end = basesrc->size;
basesrc->need_discont = TRUE;
/* check if we can seek, updates ->seekable */
gst_base_src_is_seekable (basesrc);
/* run typefind */
#if 0
if (basesrc->seekable) {
GstCaps *caps;
caps = gst_type_find_helper (basesrc->srcpad, basesrc->size);
gst_pad_set_caps (basesrc->srcpad, caps);
gst_caps_unref (caps);
}
#endif
if (!gst_base_src_negotiate (basesrc))
goto could_not_negotiate;
return TRUE;
/* ERROR */
could_not_start:
{
GST_DEBUG_OBJECT (basesrc, "could not start");
return FALSE;
}
could_not_negotiate:
{
GST_DEBUG_OBJECT (basesrc, "could not negotiate, stopping");
GST_ELEMENT_ERROR (basesrc, STREAM, FORMAT,
("Could not connect source to pipeline"),
("Check your filtered caps, if any"));
gst_base_src_stop (basesrc);
return FALSE;
}
}
static gboolean
gst_base_src_stop (GstBaseSrc * basesrc)
{
GstBaseSrcClass *bclass;
gboolean result = TRUE;
if (!GST_FLAG_IS_SET (basesrc, GST_BASE_SRC_STARTED))
return TRUE;
GST_DEBUG_OBJECT (basesrc, "stopping source");
bclass = GST_BASE_SRC_GET_CLASS (basesrc);
if (bclass->stop)
result = bclass->stop (basesrc);
if (result)
GST_FLAG_UNSET (basesrc, GST_BASE_SRC_STARTED);
return result;
}
static gboolean
gst_base_src_deactivate (GstBaseSrc * basesrc, GstPad * pad)
{
gboolean result;
GST_LIVE_LOCK (basesrc);
basesrc->live_running = TRUE;
GST_LIVE_SIGNAL (basesrc);
GST_LIVE_UNLOCK (basesrc);
/* step 1, unblock clock sync (if any) */
gst_base_src_unlock (basesrc);
/* step 2, make sure streaming finishes */
result = gst_pad_stop_task (pad);
return result;
}
static gboolean
gst_base_src_activate_push (GstPad * pad, gboolean active)
{
GstBaseSrc *basesrc;
basesrc = GST_BASE_SRC (GST_OBJECT_PARENT (pad));
/* prepare subclass first */
if (active) {
GST_DEBUG_OBJECT (basesrc, "Activating in push mode");
if (!basesrc->can_activate_push)
goto no_push_activation;
if (!gst_base_src_start (basesrc))
goto error_start;
return gst_pad_start_task (pad, (GstTaskFunction) gst_base_src_loop, pad);
} else {
GST_DEBUG_OBJECT (basesrc, "Deactivating in push mode");
return gst_base_src_deactivate (basesrc, pad);
}
no_push_activation:
{
GST_DEBUG_OBJECT (basesrc, "Subclass disabled push-mode activation");
return FALSE;
}
error_start:
{
gst_base_src_stop (basesrc);
GST_DEBUG_OBJECT (basesrc, "Failed to start in push mode");
return FALSE;
}
}
static gboolean
gst_base_src_activate_pull (GstPad * pad, gboolean active)
{
GstBaseSrc *basesrc;
basesrc = GST_BASE_SRC (GST_OBJECT_PARENT (pad));
/* prepare subclass first */
if (active) {
GST_DEBUG_OBJECT (basesrc, "Activating in pull mode");
if (!gst_base_src_start (basesrc))
goto error_start;
if (!basesrc->seekable) {
gst_base_src_stop (basesrc);
return FALSE;
}
return TRUE;
} else {
GST_DEBUG_OBJECT (basesrc, "Deactivating in pull mode");
if (!gst_base_src_stop (basesrc))
goto error_stop;
return gst_base_src_deactivate (basesrc, pad);
}
error_start:
{
gst_base_src_stop (basesrc);
GST_DEBUG_OBJECT (basesrc, "Failed to start in pull mode");
return FALSE;
}
error_stop:
{
GST_DEBUG_OBJECT (basesrc, "Failed to stop in pull mode");
return FALSE;
}
}
static GstStateChangeReturn
gst_base_src_change_state (GstElement * element, GstStateChange transition)
{
GstBaseSrc *basesrc;
GstStateChangeReturn result = GST_STATE_CHANGE_SUCCESS;
GstStateChangeReturn presult;
basesrc = GST_BASE_SRC (element);
switch (transition) {
case GST_STATE_CHANGE_NULL_TO_READY:
break;
case GST_STATE_CHANGE_READY_TO_PAUSED:
GST_LIVE_LOCK (element);
if (basesrc->is_live) {
result = GST_STATE_CHANGE_NO_PREROLL;
basesrc->live_running = FALSE;
}
GST_LIVE_UNLOCK (element);
break;
case GST_STATE_CHANGE_PAUSED_TO_PLAYING:
GST_LIVE_LOCK (element);
if (basesrc->is_live) {
basesrc->live_running = TRUE;
GST_LIVE_SIGNAL (element);
}
GST_LIVE_UNLOCK (element);
break;
default:
break;
}
if ((presult =
GST_ELEMENT_CLASS (parent_class)->change_state (element,
transition)) == GST_STATE_CHANGE_FAILURE)
goto failure;
switch (transition) {
case GST_STATE_CHANGE_PLAYING_TO_PAUSED:
GST_LIVE_LOCK (element);
if (basesrc->is_live) {
result = GST_STATE_CHANGE_NO_PREROLL;
basesrc->live_running = FALSE;
}
GST_LIVE_UNLOCK (element);
break;
case GST_STATE_CHANGE_PAUSED_TO_READY:
if (!gst_base_src_stop (basesrc))
result = GST_STATE_CHANGE_FAILURE;
break;
case GST_STATE_CHANGE_READY_TO_NULL:
break;
default:
break;
}
return result;
/* ERRORS */
failure:
{
gst_base_src_stop (basesrc);
return presult;
}
}