gstreamer/libs/gst/base/gstbasesrc.c
Andy Wingo 09ab1d8fb2 gst/base/gstbasesrc.c (gst_basesrc_get_range): Check if the offset is greater than the file's size.
Original commit message from CVS:
2005-06-23  Andy Wingo  <wingo@pobox.com>

* gst/base/gstbasesrc.c (gst_basesrc_get_range): Check if the
offset is greater than the file's size.
2005-06-23 15:26:09 +00:00

844 lines
20 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.
*/
#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
GST_DEBUG_CATEGORY_STATIC (gst_basesrc_debug);
#define GST_CAT_DEFAULT gst_basesrc_debug
/* BaseSrc signals and args */
enum
{
/* FILL ME */
LAST_SIGNAL
};
enum
{
PROP_0,
PROP_BLOCKSIZE,
PROP_HAS_LOOP,
PROP_HAS_GETRANGE,
};
static GstElementClass *parent_class = NULL;
static void gst_basesrc_base_init (gpointer g_class);
static void gst_basesrc_class_init (GstBaseSrcClass * klass);
static void gst_basesrc_init (GstBaseSrc * src, gpointer g_class);
GType
gst_basesrc_get_type (void)
{
static GType basesrc_type = 0;
if (!basesrc_type) {
static const GTypeInfo basesrc_info = {
sizeof (GstBaseSrcClass),
(GBaseInitFunc) gst_basesrc_base_init,
NULL,
(GClassInitFunc) gst_basesrc_class_init,
NULL,
NULL,
sizeof (GstBaseSrc),
0,
(GInstanceInitFunc) gst_basesrc_init,
};
basesrc_type = g_type_register_static (GST_TYPE_ELEMENT,
"GstBaseSrc", &basesrc_info, G_TYPE_FLAG_ABSTRACT);
}
return basesrc_type;
}
static gboolean gst_basesrc_activate (GstPad * pad, GstActivateMode mode);
static void gst_basesrc_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec);
static void gst_basesrc_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec);
static gboolean gst_basesrc_event_handler (GstPad * pad, GstEvent * event);
static gboolean gst_basesrc_query (GstPad * pad, GstQuery * query);
#if 0
static const GstEventMask *gst_basesrc_get_event_mask (GstPad * pad);
#endif
static gboolean gst_basesrc_unlock (GstBaseSrc * basesrc);
static gboolean gst_basesrc_get_size (GstBaseSrc * basesrc, guint64 * size);
static gboolean gst_basesrc_start (GstBaseSrc * basesrc);
static gboolean gst_basesrc_stop (GstBaseSrc * basesrc);
static GstElementStateReturn gst_basesrc_change_state (GstElement * element);
static void gst_basesrc_set_dataflow_funcs (GstBaseSrc * this);
static void gst_basesrc_loop (GstPad * pad);
static gboolean gst_basesrc_check_get_range (GstPad * pad);
static GstFlowReturn gst_basesrc_get_range (GstPad * pad, guint64 offset,
guint length, GstBuffer ** buf);
static void
gst_basesrc_base_init (gpointer g_class)
{
GST_DEBUG_CATEGORY_INIT (gst_basesrc_debug, "basesrc", 0, "basesrc element");
}
static void
gst_basesrc_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->set_property = GST_DEBUG_FUNCPTR (gst_basesrc_set_property);
gobject_class->get_property = GST_DEBUG_FUNCPTR (gst_basesrc_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_HAS_LOOP,
g_param_spec_boolean ("has-loop", "Has loop function",
"True if the element should expose a loop function", TRUE,
G_PARAM_READWRITE | G_PARAM_CONSTRUCT));
g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_HAS_GETRANGE,
g_param_spec_boolean ("has-getrange", "Has getrange function",
"True if the element should expose a getrange function", TRUE,
G_PARAM_READWRITE | G_PARAM_CONSTRUCT));
gstelement_class->change_state = GST_DEBUG_FUNCPTR (gst_basesrc_change_state);
}
static void
gst_basesrc_init (GstBaseSrc * basesrc, gpointer g_class)
{
GstPad *pad;
GstPadTemplate *pad_template;
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_activate_function (pad, gst_basesrc_activate);
gst_pad_set_event_function (pad, gst_basesrc_event_handler);
gst_pad_set_query_function (pad, gst_basesrc_query);
gst_pad_set_checkgetrange_function (pad, gst_basesrc_check_get_range);
basesrc->is_live = FALSE;
basesrc->live_lock = g_mutex_new ();
basesrc->live_cond = g_cond_new ();
/* hold ref to pad */
basesrc->srcpad = pad;
gst_element_add_pad (GST_ELEMENT (basesrc), pad);
basesrc->segment_start = -1;
basesrc->segment_end = -1;
basesrc->blocksize = DEFAULT_BLOCKSIZE;
basesrc->clock_id = NULL;
GST_FLAG_UNSET (basesrc, GST_BASESRC_STARTED);
}
void
gst_basesrc_set_live (GstBaseSrc * src, gboolean live)
{
GST_LIVE_LOCK (src);
src->is_live = live;
GST_LIVE_UNLOCK (src);
}
gboolean
gst_basesrc_is_live (GstBaseSrc * src)
{
gboolean result;
GST_LIVE_LOCK (src);
result = src->is_live;
GST_LIVE_UNLOCK (src);
return result;
}
static void
gst_basesrc_set_dataflow_funcs (GstBaseSrc * this)
{
GST_DEBUG ("updating dataflow functions");
if (this->has_loop)
gst_pad_set_loop_function (this->srcpad, gst_basesrc_loop);
else
gst_pad_set_loop_function (this->srcpad, NULL);
if (this->has_getrange)
gst_pad_set_getrange_function (this->srcpad, gst_basesrc_get_range);
else
gst_pad_set_getrange_function (this->srcpad, NULL);
}
static gboolean
gst_basesrc_query (GstPad * pad, GstQuery * query)
{
gboolean b;
guint64 ui64;
gint64 i64;
GstBaseSrc *src;
src = GST_BASESRC (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_basesrc_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_basesrc_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);
}
}
#if 0
static const GstEventMask *
gst_basesrc_get_event_mask (GstPad * pad)
{
static const GstEventMask masks[] = {
{GST_EVENT_SEEK, GST_SEEK_METHOD_CUR | GST_SEEK_METHOD_SET |
GST_SEEK_METHOD_END | GST_SEEK_FLAG_FLUSH |
GST_SEEK_FLAG_SEGMENT_LOOP},
{GST_EVENT_FLUSH, 0},
{GST_EVENT_SIZE, 0},
{0, 0},
};
return masks;
}
#endif
static gboolean
gst_basesrc_do_seek (GstBaseSrc * src, GstEvent * event)
{
GstFormat format;
gint64 offset;
format = GST_EVENT_SEEK_FORMAT (event);
/* 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 */
offset = GST_EVENT_SEEK_OFFSET (event);
src->segment_loop = GST_EVENT_SEEK_FLAGS (event) & GST_SEEK_FLAG_SEGMENT_LOOP;
switch (GST_EVENT_SEEK_METHOD (event)) {
case GST_SEEK_METHOD_SET:
if (offset < 0)
goto error;
src->offset = MIN (offset, src->size);
src->segment_start = src->offset;
src->segment_end = MIN (GST_EVENT_SEEK_ENDOFFSET (event), src->size);
GST_DEBUG_OBJECT (src, "seek set pending to %" G_GINT64_FORMAT,
src->offset);
break;
case GST_SEEK_METHOD_CUR:
offset += src->offset;
src->offset = CLAMP (offset, 0, src->size);
src->segment_start = src->offset;
src->segment_end = GST_EVENT_SEEK_ENDOFFSET (event);
GST_DEBUG_OBJECT (src, "seek cur pending to %" G_GINT64_FORMAT,
src->offset);
break;
case GST_SEEK_METHOD_END:
if (offset > 0)
goto error;
offset = src->size + offset;
src->offset = MAX (0, offset);
src->segment_start = src->offset;
src->segment_end = GST_EVENT_SEEK_ENDOFFSET (event);
GST_DEBUG_OBJECT (src, "seek end pending to %" G_GINT64_FORMAT,
src->offset);
break;
default:
goto error;
}
/* send flush start */
gst_pad_push_event (src->srcpad, gst_event_new_flush (FALSE));
/* unblock streaming thread */
gst_basesrc_unlock (src);
/* grab streaming lock */
GST_STREAM_LOCK (src->srcpad);
/* send flush end */
gst_pad_push_event (src->srcpad, gst_event_new_flush (TRUE));
/* now send discont */
{
GstEvent *event;
event = gst_event_new_discontinuous (1.0,
GST_FORMAT_BYTES,
(gint64) src->segment_start, (gint64) src->segment_end, NULL);
gst_pad_push_event (src->srcpad, event);
}
/* and restart the task */
gst_pad_start_task (src->srcpad, (GstTaskFunction) gst_basesrc_loop,
src->srcpad);
GST_STREAM_UNLOCK (src->srcpad);
gst_event_unref (event);
return TRUE;
/* ERROR */
error:
{
GST_DEBUG_OBJECT (src, "seek error");
gst_event_unref (event);
return FALSE;
}
}
static gboolean
gst_basesrc_event_handler (GstPad * pad, GstEvent * event)
{
GstBaseSrc *src;
GstBaseSrcClass *bclass;
gboolean result;
src = GST_BASESRC (GST_PAD_PARENT (pad));
bclass = GST_BASESRC_GET_CLASS (src);
if (bclass->event)
result = bclass->event (src, event);
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_SEEK:
return gst_basesrc_do_seek (src, event);
case GST_EVENT_SIZE:
{
GstFormat format;
format = GST_EVENT_SIZE_FORMAT (event);
if (format == GST_FORMAT_DEFAULT)
format = GST_FORMAT_BYTES;
/* we can only accept bytes */
if (format != GST_FORMAT_BYTES)
return FALSE;
src->blocksize = GST_EVENT_SIZE_VALUE (event);
g_object_notify (G_OBJECT (src), "blocksize");
break;
}
case GST_EVENT_FLUSH:
/* cancel any blocking getrange */
if (!GST_EVENT_FLUSH_DONE (event))
gst_basesrc_unlock (src);
break;
default:
break;
}
gst_event_unref (event);
return TRUE;
}
static void
gst_basesrc_set_property (GObject * object, guint prop_id, const GValue * value,
GParamSpec * pspec)
{
GstBaseSrc *src;
src = GST_BASESRC (object);
switch (prop_id) {
case PROP_BLOCKSIZE:
src->blocksize = g_value_get_ulong (value);
break;
case PROP_HAS_LOOP:
src->has_loop = g_value_get_boolean (value);
gst_basesrc_set_dataflow_funcs (src);
break;
case PROP_HAS_GETRANGE:
src->has_getrange = g_value_get_boolean (value);
gst_basesrc_set_dataflow_funcs (src);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void
gst_basesrc_get_property (GObject * object, guint prop_id, GValue * value,
GParamSpec * pspec)
{
GstBaseSrc *src;
src = GST_BASESRC (object);
switch (prop_id) {
case PROP_BLOCKSIZE:
g_value_set_ulong (value, src->blocksize);
break;
case PROP_HAS_LOOP:
g_value_set_boolean (value, src->has_loop);
break;
case PROP_HAS_GETRANGE:
g_value_set_boolean (value, src->has_getrange);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static GstFlowReturn
gst_basesrc_get_range (GstPad * pad, guint64 offset, guint length,
GstBuffer ** buf)
{
GstFlowReturn ret;
GstBaseSrc *src;
GstBaseSrcClass *bclass;
src = GST_BASESRC (GST_OBJECT_PARENT (pad));
bclass = GST_BASESRC_GET_CLASS (src);
GST_LIVE_LOCK (src);
if (src->is_live) {
while (!src->live_running) {
GST_DEBUG ("live source waiting for running state");
GST_LIVE_WAIT (src);
GST_DEBUG ("live source unlocked");
}
}
GST_LIVE_UNLOCK (src);
if (!GST_FLAG_IS_SET (src, GST_BASESRC_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;
ret = bclass->create (src, offset, length, buf);
return ret;
/* ERROR */
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;
}
}
static gboolean
gst_basesrc_check_get_range (GstPad * pad)
{
GstBaseSrc *src;
src = GST_BASESRC (GST_OBJECT_PARENT (pad));
if (!GST_FLAG_IS_SET (src, GST_BASESRC_STARTED)) {
gst_basesrc_start (src);
gst_basesrc_stop (src);
}
return src->seekable;
}
static void
gst_basesrc_loop (GstPad * pad)
{
GstBaseSrc *src;
GstBuffer *buf = NULL;
GstFlowReturn ret;
src = GST_BASESRC (GST_OBJECT_PARENT (pad));
ret = gst_basesrc_get_range (pad, src->offset, src->blocksize, &buf);
if (ret != GST_FLOW_OK)
goto eos;
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 (GST_EVENT_EOS));
return;
}
pause:
{
GST_DEBUG_OBJECT (src, "pausing task");
gst_pad_pause_task (pad);
return;
}
}
static gboolean
gst_basesrc_unlock (GstBaseSrc * basesrc)
{
GstBaseSrcClass *bclass;
gboolean result = FALSE;
GST_DEBUG ("unlock");
/* unblock whatever the subclass is doing */
bclass = GST_BASESRC_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_basesrc_get_size (GstBaseSrc * basesrc, guint64 * size)
{
GstBaseSrcClass *bclass;
gboolean result = FALSE;
bclass = GST_BASESRC_GET_CLASS (basesrc);
if (bclass->get_size)
result = bclass->get_size (basesrc, size);
if (result)
basesrc->size = *size;
return result;
}
static gboolean
gst_basesrc_is_seekable (GstBaseSrc * basesrc)
{
GstBaseSrcClass *bclass;
bclass = GST_BASESRC_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_basesrc_start (GstBaseSrc * basesrc)
{
GstBaseSrcClass *bclass;
gboolean result;
if (GST_FLAG_IS_SET (basesrc, GST_BASESRC_STARTED))
return TRUE;
bclass = GST_BASESRC_GET_CLASS (basesrc);
if (bclass->start)
result = bclass->start (basesrc);
else
result = TRUE;
if (!result)
goto could_not_start;
GST_FLAG_SET (basesrc, GST_BASESRC_STARTED);
/* start in the beginning */
basesrc->offset = 0;
basesrc->segment_start = 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_end = -1;
/* check if we can seek, updates ->seekable */
gst_basesrc_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);
}
#endif
return TRUE;
/* ERROR */
could_not_start:
{
GST_DEBUG_OBJECT (basesrc, "could not start");
return FALSE;
}
}
static gboolean
gst_basesrc_stop (GstBaseSrc * basesrc)
{
GstBaseSrcClass *bclass;
gboolean result = TRUE;
if (!GST_FLAG_IS_SET (basesrc, GST_BASESRC_STARTED))
return TRUE;
bclass = GST_BASESRC_GET_CLASS (basesrc);
if (bclass->stop)
result = bclass->stop (basesrc);
if (result)
GST_FLAG_UNSET (basesrc, GST_BASESRC_STARTED);
return result;
}
static gboolean
gst_basesrc_activate (GstPad * pad, GstActivateMode mode)
{
gboolean result;
GstBaseSrc *basesrc;
basesrc = GST_BASESRC (GST_OBJECT_PARENT (pad));
/* prepare subclass first */
switch (mode) {
case GST_ACTIVATE_PUSH:
case GST_ACTIVATE_PULL:
result = gst_basesrc_start (basesrc);
break;
default:
result = TRUE;
break;
}
/* if that failed we can stop here */
if (!result)
goto error_start;
result = FALSE;
switch (mode) {
case GST_ACTIVATE_PUSH:
result =
gst_pad_start_task (pad, (GstTaskFunction) gst_basesrc_loop, pad);
break;
case GST_ACTIVATE_PULL:
result = basesrc->seekable;
if (!result)
gst_basesrc_stop (basesrc);
break;
case GST_ACTIVATE_NONE:
GST_LIVE_LOCK (basesrc);
basesrc->live_running = TRUE;
GST_LIVE_SIGNAL (basesrc);
GST_LIVE_UNLOCK (basesrc);
/* step 1, unblock clock sync (if any) */
gst_basesrc_unlock (basesrc);
/* step 2, make sure streaming finishes */
result = gst_pad_stop_task (pad);
break;
}
return result;
/* ERROR */
error_start:
{
GST_DEBUG_OBJECT (basesrc, "failed to start");
return FALSE;
}
}
static GstElementStateReturn
gst_basesrc_change_state (GstElement * element)
{
GstBaseSrc *basesrc;
GstElementStateReturn result = GST_STATE_SUCCESS;
GstElementStateReturn presult;
GstElementState transition;
basesrc = GST_BASESRC (element);
transition = GST_STATE_TRANSITION (element);
switch (transition) {
case GST_STATE_NULL_TO_READY:
break;
case GST_STATE_READY_TO_PAUSED:
GST_LIVE_LOCK (element);
if (basesrc->is_live) {
result = GST_STATE_NO_PREROLL;
basesrc->live_running = FALSE;
}
GST_LIVE_UNLOCK (element);
break;
case GST_STATE_PAUSED_TO_PLAYING:
GST_LIVE_LOCK (element);
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)) !=
GST_STATE_SUCCESS)
return presult;
switch (transition) {
case GST_STATE_PLAYING_TO_PAUSED:
GST_LIVE_LOCK (element);
if (basesrc->is_live) {
result = GST_STATE_NO_PREROLL;
basesrc->live_running = FALSE;
}
GST_LIVE_UNLOCK (element);
break;
case GST_STATE_PAUSED_TO_READY:
if (!gst_basesrc_stop (basesrc))
result = GST_STATE_FAILURE;
break;
case GST_STATE_READY_TO_NULL:
break;
default:
break;
}
return result;
}