gstreamer/gst/elements/gstbufferstore.c

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/* GStreamer
* Copyright (C) 2003 Benjamin Otte <in7y118@public.uni-hamburg.de>
*
* gstbufferstore.c: keep an easily accessible list of all buffers
*
* 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.
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include "gstbufferstore.h"
#include <gst/gstutils.h>
#include <string.h>
GST_DEBUG_CATEGORY_STATIC (gst_buffer_store_debug);
#define GST_CAT_DEFAULT gst_buffer_store_debug
enum {
CLEARED,
BUFFER_ADDED,
LAST_SIGNAL
};
enum {
ARG_0
};
static void gst_buffer_store_dispose (GObject * object);
static gboolean gst_buffer_store_add_buffer_func (GstBufferStore * store,
GstBuffer * buffer);
static void gst_buffer_store_cleared_func (GstBufferStore * store);
static guint gst_buffer_store_signals[LAST_SIGNAL] = { 0 };
#define _do_init(bla) \
GST_DEBUG_CATEGORY_INIT (gst_buffer_store_debug, "GstBufferStore", 0, "buffer store helper");
GST_BOILERPLATE_FULL (GstBufferStore, gst_buffer_store, GObject, G_TYPE_OBJECT, _do_init);
G_GNUC_UNUSED static void
debug_buffers (GstBufferStore *store)
{
GList *walk = store->buffers;
g_printerr ("BUFFERS in store:\n");
while (walk) {
g_print ("%15"G_GUINT64_FORMAT" - %7u\n", GST_BUFFER_OFFSET (walk->data), GST_BUFFER_SIZE (walk->data));
walk = g_list_next (walk);
}
g_printerr ("\n");
}
static gboolean
continue_accu (GSignalInvocationHint *ihint, GValue *return_accu,
const GValue *handler_return, gpointer data)
{
gboolean do_continue = g_value_get_boolean (handler_return);
g_value_set_boolean (return_accu, do_continue);
return do_continue;
}
static void
gst_buffer_store_base_init (gpointer g_class)
{
}
static void
gst_buffer_store_class_init (GstBufferStoreClass *store_class)
{
GObjectClass *gobject_class = G_OBJECT_CLASS (store_class);
gobject_class->dispose = gst_buffer_store_dispose;
gst_buffer_store_signals[CLEARED] = g_signal_new ("cleared",
G_TYPE_FROM_CLASS (store_class), G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (GstBufferStoreClass, cleared), NULL, NULL,
gst_marshal_VOID__VOID, G_TYPE_NONE, 0);
gst_buffer_store_signals[BUFFER_ADDED] = g_signal_new ("buffer-added",
G_TYPE_FROM_CLASS (store_class), G_SIGNAL_RUN_LAST,
G_STRUCT_OFFSET (GstBufferStoreClass, buffer_added), continue_accu, NULL,
gst_marshal_BOOLEAN__POINTER, G_TYPE_BOOLEAN, 1, GST_TYPE_BUFFER);
store_class->cleared = gst_buffer_store_cleared_func;
store_class->buffer_added = gst_buffer_store_add_buffer_func;
}
static void
gst_buffer_store_init (GstBufferStore *store)
{
store->buffers = NULL;
}
static void
gst_buffer_store_dispose (GObject *object)
{
GstBufferStore *store = GST_BUFFER_STORE (object);
gst_buffer_store_clear (store);
parent_class->dispose (object);
}
static gboolean
gst_buffer_store_add_buffer_func (GstBufferStore *store, GstBuffer *buffer)
{
g_assert (buffer != NULL);
if (!GST_BUFFER_OFFSET_IS_VALID (buffer) &&
store->buffers &&
GST_BUFFER_OFFSET_IS_VALID (store->buffers->data)) {
/* we assumed valid offsets, but suddenly they are not anymore */
GST_DEBUG_OBJECT (store, "attempting to add buffer %p with invalid offset to store with valid offset, abort",
buffer);
return FALSE;
} else if (!store->buffers || !GST_BUFFER_OFFSET_IS_VALID (store->buffers->data)) {
/* the starting buffer had an invalid offset, in that case we assume continuous buffers */
GST_LOG_OBJECT (store, "adding buffer %p with invalid offset and size %u",
buffer, GST_BUFFER_SIZE (buffer));
gst_data_ref (GST_DATA (buffer));
store->buffers = g_list_append (store->buffers, buffer);
return TRUE;
} else {
/* both list and buffer have valid offsets, we can really go wild */
GList *walk, *current_list = NULL;
GstBuffer *current;
g_assert (GST_BUFFER_OFFSET_IS_VALID (buffer));
GST_LOG_OBJECT (store, "attempting to add buffer %p with offset %"G_GUINT64_FORMAT" and size %u",
buffer, GST_BUFFER_OFFSET (buffer), GST_BUFFER_SIZE (buffer));
/* we keep a sorted list of non-overlapping buffers */
walk = store->buffers;
while (walk) {
current = GST_BUFFER (walk->data);
current_list = walk;
walk = g_list_next (walk);
if (GST_BUFFER_OFFSET (current) < GST_BUFFER_OFFSET (buffer)) {
continue;
} else if (GST_BUFFER_OFFSET (current) == GST_BUFFER_OFFSET (buffer)) {
guint needed_size;
if (walk) {
needed_size = MIN (GST_BUFFER_SIZE (buffer),
GST_BUFFER_OFFSET (walk->data) - GST_BUFFER_OFFSET (current));
} else {
needed_size = GST_BUFFER_SIZE (buffer);
}
if (needed_size <= GST_BUFFER_SIZE (current)) {
buffer = NULL;
break;
} else {
if (needed_size < GST_BUFFER_SIZE (buffer)) {
/* need to create subbuffer to not have overlapping data */
GstBuffer *sub = gst_buffer_create_sub (buffer, 0, needed_size);
g_assert (sub);
buffer = sub;
} else {
gst_data_ref (GST_DATA (buffer));
}
/* replace current buffer with new one */
GST_INFO_OBJECT (store, "replacing buffer %p with buffer %p with offset %"G_GINT64_FORMAT" and size %u",
current_list->data, buffer, GST_BUFFER_OFFSET (buffer), GST_BUFFER_SIZE (buffer));
gst_data_unref (GST_DATA (current_list->data));
current_list->data = buffer;
buffer = NULL;
break;
}
} else if (GST_BUFFER_OFFSET (current) > GST_BUFFER_OFFSET (buffer)) {
GList *previous = g_list_previous (current_list);
guint64 start_offset = previous ?
GST_BUFFER_OFFSET (previous->data) + GST_BUFFER_SIZE (previous->data) : 0;
if (start_offset == GST_BUFFER_OFFSET (current)) {
buffer = NULL;
break;
} else {
/* we have data to insert */
if (start_offset > GST_BUFFER_OFFSET (buffer) ||
GST_BUFFER_OFFSET (buffer) + GST_BUFFER_SIZE (buffer) > GST_BUFFER_OFFSET (current)) {
GstBuffer *sub;
/* need a subbuffer */
start_offset = GST_BUFFER_OFFSET (buffer) > start_offset ? 0 :
start_offset - GST_BUFFER_OFFSET (buffer);
sub = gst_buffer_create_sub (buffer, start_offset,
MIN (GST_BUFFER_SIZE (buffer), GST_BUFFER_OFFSET (current) - start_offset - GST_BUFFER_OFFSET (buffer)));
g_assert (sub);
GST_BUFFER_OFFSET (sub) = start_offset + GST_BUFFER_OFFSET (buffer);
buffer = sub;
} else {
gst_data_ref (GST_DATA (buffer));
}
GST_INFO_OBJECT (store, "adding buffer %p with offset %"G_GINT64_FORMAT" and size %u",
buffer, GST_BUFFER_OFFSET (buffer), GST_BUFFER_SIZE (buffer));
store->buffers = g_list_insert_before (store->buffers, current_list, buffer);
buffer = NULL;
break;
}
}
}
if (buffer) {
gst_data_ref (GST_DATA (buffer));
GST_INFO_OBJECT (store, "adding buffer %p with offset %"G_GINT64_FORMAT" and size %u",
buffer, GST_BUFFER_OFFSET (buffer), GST_BUFFER_SIZE (buffer));
if (current_list) {
g_list_append (current_list, buffer);
} else {
g_assert (store->buffers == NULL);
store->buffers = g_list_prepend (NULL, buffer);
}
}
return TRUE;
}
}
static void
gst_buffer_store_cleared_func (GstBufferStore *store)
{
g_list_foreach (store->buffers, (GFunc) gst_data_unref, NULL);
g_list_free (store->buffers);
store->buffers = NULL;
}
/**
* gst_buffer_store_new:
*
* Creates a new bufferstore.
*
* Returns: the new bufferstore.
*/
GstBufferStore *
gst_buffer_store_new (void)
{
return GST_BUFFER_STORE (g_object_new (GST_TYPE_BUFFER_STORE, NULL));
}
/**
* gst_buffer_store_clear:
* @store: a bufferstore
*
* Clears the buffer store. All buffers are removed and the buffer store
* behaves like it was just created.
*/
/* FIXME: call this function _reset ? */
void
gst_buffer_store_clear (GstBufferStore *store)
{
g_return_if_fail (GST_IS_BUFFER_STORE (store));
g_signal_emit (store, gst_buffer_store_signals [CLEARED], 0, NULL);
}
/**
* gst_buffer_store_add_buffer:
* @store: a bufferstore
* @buffer: the buffer to add
*
* Adds a buffer to the buffer store.
*
* Returns: TRUE, if the buffer was added, FALSE if an error occured.
*/
gboolean
gst_buffer_store_add_buffer (GstBufferStore *store, GstBuffer *buffer)
{
gboolean ret;
g_return_val_if_fail (GST_IS_BUFFER_STORE (store), FALSE);
g_return_val_if_fail (GST_IS_BUFFER (buffer), FALSE);
if (store->buffers &&
GST_BUFFER_OFFSET_IS_VALID (store->buffers->data) &&
!GST_BUFFER_OFFSET_IS_VALID (buffer))
return FALSE;
g_signal_emit (store, gst_buffer_store_signals [BUFFER_ADDED], 0, buffer, &ret);
return ret;
}
/**
* gst_buffer_store_get_buffer:
* @store: a bufferstore
* @offset: starting offset of returned buffer
* @size: size of returned buffer
*
* Returns a buffer that corresponds to the given area of data. If part of the
* data is not available inside the store, NULL is returned. You have to unref
* the buffer after use.
*
* Returns: a buffer with the requested data or NULL if the data was not
* available.
*/
GstBuffer *
gst_buffer_store_get_buffer (GstBufferStore *store, guint64 offset, guint size)
{
GstBuffer *current;
GList *walk;
guint8 *data;
guint tmp;
gboolean have_offset;
guint64 cur_offset = 0;
GstBuffer *ret = NULL;
g_return_val_if_fail (GST_IS_BUFFER_STORE (store), NULL);
walk = store->buffers;
if (!walk)
return NULL;
if (GST_BUFFER_OFFSET_IS_VALID (walk->data)) {
have_offset = TRUE;
} else {
have_offset = FALSE;
}
while (walk) {
current = GST_BUFFER (walk->data);
if (have_offset) {
cur_offset = GST_BUFFER_OFFSET (current);
}
walk = g_list_next (walk);
if (cur_offset > offset) {
/* #include <windows.h>
do_nothing_loop (); */
} else if (cur_offset == offset &&
GST_BUFFER_SIZE (current) == size) {
GST_LOG_OBJECT (store, "found matching buffer %p for offset %"G_GUINT64_FORMAT" and size %u",
current, offset, size);
ret = current;
gst_data_ref (GST_DATA (ret));
GST_LOG_OBJECT (store, "refcount %d",
GST_DATA_REFCOUNT_VALUE(ret));
break;
} else if (cur_offset + GST_BUFFER_SIZE (current) > offset) {
if (cur_offset + GST_BUFFER_SIZE (current) >= offset + size) {
ret = gst_buffer_create_sub (current, offset - cur_offset, size);
GST_LOG_OBJECT (store, "created subbuffer %p from buffer %p for offset %llu and size %u",
ret, current, offset, size);
break;
}
/* uh, the requested data spans some buffers */
ret = gst_buffer_new_and_alloc (size);
GST_LOG_OBJECT (store, "created buffer %p for offset %"G_GUINT64_FORMAT
" and size %u, will fill with data now",
ret, offset, size);
data = GST_BUFFER_DATA (ret);
tmp = GST_BUFFER_SIZE (current) - offset + cur_offset;
memcpy (data, GST_BUFFER_DATA (current) + offset - cur_offset, tmp);
data += tmp;
size -= tmp;
while (size) {
if (walk == NULL ||
(have_offset &&
GST_BUFFER_OFFSET (current) + GST_BUFFER_SIZE (current) != GST_BUFFER_OFFSET (walk->data))) {
GST_DEBUG_OBJECT (store, "not all data for offset %"G_GUINT64_FORMAT" and remaining size %u available, aborting",
offset, size);
gst_data_unref (GST_DATA (ret));
ret = NULL;
goto out;
}
current = GST_BUFFER (walk->data);
walk = g_list_next (walk);
tmp = MIN (GST_BUFFER_SIZE (current), size);
memcpy (data, GST_BUFFER_DATA (current), tmp);
data += tmp;
size -= tmp;
}
}
if (!have_offset) {
cur_offset += GST_BUFFER_SIZE (current);
}
}
out:
return ret;
}
/**
* gst_buffer_store_get_size:
* @store: a bufferstore
* @offset: desired offset
*
* Calculates the number of bytes available starting from offset. This allows
* to query a buffer with the returned size.
*
* Returns: the number of continuous bytes in the bufferstore starting at
* offset.
*/
guint
gst_buffer_store_get_size (GstBufferStore *store, guint64 offset)
{
GList *walk;
gboolean have_offset;
gboolean counting = FALSE;
guint64 cur_offset = 0;
GstBuffer *current = NULL;
guint ret = 0;
g_return_val_if_fail (GST_IS_BUFFER_STORE (store), 0);
walk = store->buffers;
if (!walk)
return 0;
if (GST_BUFFER_OFFSET_IS_VALID (walk->data)) {
have_offset = TRUE;
} else {
have_offset = FALSE;
}
while (walk) {
if (have_offset && counting &&
cur_offset + GST_BUFFER_SIZE (current) != GST_BUFFER_OFFSET (walk->data)) {
break;
}
current = GST_BUFFER (walk->data);
if (have_offset) {
cur_offset = GST_BUFFER_OFFSET (current);
}
walk = g_list_next (walk);
if (counting) {
ret += GST_BUFFER_SIZE (current);
} else {
if (cur_offset > offset)
return 0;
if (cur_offset + GST_BUFFER_SIZE (current) > offset) {
/* we have at least some bytes */
ret = cur_offset + GST_BUFFER_SIZE (current) - offset;
counting = TRUE;
}
}
if (!have_offset) {
cur_offset += GST_BUFFER_SIZE (current);
}
}
return ret;
}