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https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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465 lines
14 KiB
C
465 lines
14 KiB
C
/* GStreamer
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* Copyright (C) 2003 Benjamin Otte <in7y118@public.uni-hamburg.de>
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*
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* gstbufferstore.c: keep an easily accessible list of all buffers
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#include "gstbufferstore.h"
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#include <string.h>
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GST_DEBUG_CATEGORY (gst_buffer_store_debug);
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#define GST_CAT_DEFAULT gst_buffer_store_debug
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enum {
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CLEARED,
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BUFFER_ADDED,
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LAST_SIGNAL
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};
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enum {
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ARG_0
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};
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static void gst_buffer_store_class_init (gpointer g_class,
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gpointer class_data);
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static void gst_buffer_store_init (GTypeInstance * instance,
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gpointer g_class);
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static void gst_buffer_store_dispose (GObject * object);
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static gboolean gst_buffer_store_add_buffer_func (GstBufferStore * store,
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GstBuffer * buffer);
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static void gst_buffer_store_cleared_func (GstBufferStore * store);
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static GObjectClass *parent_class = NULL;
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static guint gst_buffer_store_signals[LAST_SIGNAL] = { 0 };
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G_GNUC_UNUSED static void
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debug_buffers (GstBufferStore *store)
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{
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GList *walk = store->buffers;
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g_printerr ("BUFFERS in store:\n");
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while (walk) {
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g_print ("%15"G_GUINT64_FORMAT" - %7u\n", GST_BUFFER_OFFSET (walk->data), GST_BUFFER_SIZE (walk->data));
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walk = g_list_next (walk);
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}
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g_printerr ("\n");
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}
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GType
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gst_buffer_store_get_type (void)
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{
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static GType store_type = 0;
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if (!store_type) {
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static const GTypeInfo store_info = {
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sizeof (GstBufferStoreClass),
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NULL,
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NULL,
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gst_buffer_store_class_init,
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NULL,
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NULL,
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sizeof (GstBufferStore),
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0,
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gst_buffer_store_init,
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NULL
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};
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store_type = g_type_register_static (G_TYPE_OBJECT,
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"GstBufferStore",
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&store_info, 0);
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/* FIXME: better description anyone? */
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GST_DEBUG_CATEGORY_INIT (gst_buffer_store_debug, "bufferstore", 0, "store all data");
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}
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return store_type;
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}
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static gboolean
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continue_accu (GSignalInvocationHint *ihint, GValue *return_accu,
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const GValue *handler_return, gpointer data)
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{
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gboolean do_continue = g_value_get_boolean (handler_return);
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g_value_set_boolean (return_accu, do_continue);
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return do_continue;
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}
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static void
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gst_buffer_store_class_init (gpointer g_class, gpointer class_data)
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{
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GObjectClass *gobject_class;
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GstBufferStoreClass *store_class;
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gobject_class = G_OBJECT_CLASS (g_class);
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store_class = GST_BUFFER_STORE_CLASS (g_class);
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parent_class = g_type_class_peek_parent (g_class);
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gobject_class->dispose = gst_buffer_store_dispose;
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gst_buffer_store_signals[CLEARED] = g_signal_new ("cleared",
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G_TYPE_FROM_CLASS (g_class), G_SIGNAL_RUN_LAST,
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G_STRUCT_OFFSET (GstBufferStoreClass, cleared), NULL, NULL,
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gst_marshal_VOID__VOID, G_TYPE_NONE, 0);
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gst_buffer_store_signals[BUFFER_ADDED] = g_signal_new ("buffer-added",
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G_TYPE_FROM_CLASS (g_class), G_SIGNAL_RUN_LAST,
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G_STRUCT_OFFSET (GstBufferStoreClass, buffer_added), continue_accu, NULL,
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gst_marshal_BOOLEAN__POINTER, G_TYPE_BOOLEAN, 1, G_TYPE_POINTER);
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store_class->cleared = gst_buffer_store_cleared_func;
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store_class->buffer_added = gst_buffer_store_add_buffer_func;
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}
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static void
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gst_buffer_store_init (GTypeInstance *instance, gpointer g_class)
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{
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GstBufferStore *store = GST_BUFFER_STORE (instance);
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store->buffers = NULL;
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}
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static void
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gst_buffer_store_dispose (GObject *object)
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{
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GstBufferStore *store = GST_BUFFER_STORE (object);
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gst_buffer_store_clear (store);
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parent_class->dispose (object);
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}
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static gboolean
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gst_buffer_store_add_buffer_func (GstBufferStore *store, GstBuffer *buffer)
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{
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g_assert (buffer != NULL);
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if (!GST_BUFFER_OFFSET_IS_VALID (buffer) &&
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store->buffers &&
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GST_BUFFER_OFFSET_IS_VALID (store->buffers->data)) {
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/* we assumed valid offsets, but suddenly they are not anymore */
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GST_DEBUG_OBJECT (store, "attempting to add buffer %p with invalid offset to store with valid offset, abort",
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buffer);
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return FALSE;
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} else if (!store->buffers || !GST_BUFFER_OFFSET_IS_VALID (store->buffers->data)) {
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/* the starting buffer had an invalid offset, in that case we assume continuous buffers */
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GST_LOG_OBJECT (store, "adding buffer %p with invalid offset and size %u",
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buffer, GST_BUFFER_SIZE (buffer));
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gst_data_ref (GST_DATA (buffer));
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store->buffers = g_list_append (store->buffers, buffer);
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return TRUE;
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} else {
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/* both list and buffer have valid offsets, we can really go wild */
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GList *walk, *current_list = NULL;
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GstBuffer *current;
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g_assert (GST_BUFFER_OFFSET_IS_VALID (buffer));
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GST_LOG_OBJECT (store, "attempting to add buffer %p with offset %"G_GUINT64_FORMAT" and size %u",
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buffer, GST_BUFFER_OFFSET (buffer), GST_BUFFER_SIZE (buffer));
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/* we keep a sorted list of non-overlapping buffers */
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walk = store->buffers;
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while (walk) {
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current = GST_BUFFER (walk->data);
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current_list = walk;
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walk = g_list_next (walk);
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if (GST_BUFFER_OFFSET (current) < GST_BUFFER_OFFSET (buffer)) {
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continue;
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} else if (GST_BUFFER_OFFSET (current) == GST_BUFFER_OFFSET (buffer)) {
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guint needed_size;
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if (walk) {
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needed_size = MIN (GST_BUFFER_SIZE (buffer),
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GST_BUFFER_OFFSET (walk->data) - GST_BUFFER_OFFSET (current));
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} else {
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needed_size = GST_BUFFER_SIZE (buffer);
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}
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if (needed_size <= GST_BUFFER_SIZE (current)) {
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buffer = NULL;
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break;
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} else {
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if (needed_size < GST_BUFFER_SIZE (buffer)) {
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/* need to create subbuffer to not have overlapping data */
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GstBuffer *sub = gst_buffer_create_sub (buffer, 0, needed_size);
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g_assert (sub);
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buffer = sub;
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} else {
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gst_data_ref (GST_DATA (buffer));
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}
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/* replace current buffer with new one */
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GST_INFO_OBJECT (store, "replacing buffer %p with buffer %p with offset %"G_GINT64_FORMAT" and size %u",
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current_list->data, buffer, GST_BUFFER_OFFSET (buffer), GST_BUFFER_SIZE (buffer));
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gst_data_unref (GST_DATA (current_list->data));
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current_list->data = buffer;
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buffer = NULL;
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break;
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}
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} else if (GST_BUFFER_OFFSET (current) > GST_BUFFER_OFFSET (buffer)) {
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GList *previous = g_list_previous (current_list);
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guint64 start_offset = previous ?
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GST_BUFFER_OFFSET (previous->data) + GST_BUFFER_SIZE (previous->data) : 0;
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if (start_offset == GST_BUFFER_OFFSET (current)) {
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buffer = NULL;
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break;
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} else {
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/* we have data to insert */
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if (start_offset > GST_BUFFER_OFFSET (buffer) ||
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GST_BUFFER_OFFSET (buffer) + GST_BUFFER_SIZE (buffer) > GST_BUFFER_OFFSET (current)) {
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/* need a subbuffer */
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start_offset = GST_BUFFER_OFFSET (buffer) > start_offset ? 0 :
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start_offset - GST_BUFFER_OFFSET (buffer);
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GstBuffer* sub = gst_buffer_create_sub (buffer, start_offset,
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MIN (GST_BUFFER_SIZE (buffer), GST_BUFFER_OFFSET (current) - start_offset - GST_BUFFER_OFFSET (buffer)));
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g_assert (sub);
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GST_BUFFER_OFFSET (sub) = start_offset + GST_BUFFER_OFFSET (buffer);
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buffer = sub;
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} else {
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gst_data_ref (GST_DATA (buffer));
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}
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GST_INFO_OBJECT (store, "adding buffer %p with offset %"G_GINT64_FORMAT" and size %u",
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buffer, GST_BUFFER_OFFSET (buffer), GST_BUFFER_SIZE (buffer));
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store->buffers = g_list_insert_before (store->buffers, current_list, buffer);
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buffer = NULL;
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break;
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}
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}
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}
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if (buffer) {
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gst_data_ref (GST_DATA (buffer));
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GST_INFO_OBJECT (store, "adding buffer %p with offset %"G_GINT64_FORMAT" and size %u",
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buffer, GST_BUFFER_OFFSET (buffer), GST_BUFFER_SIZE (buffer));
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if (current_list) {
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g_list_append (current_list, buffer);
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} else {
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g_assert (store->buffers == NULL);
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store->buffers = g_list_prepend (NULL, buffer);
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}
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}
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return TRUE;
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}
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}
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static void
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gst_buffer_store_cleared_func (GstBufferStore *store)
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{
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g_list_foreach (store->buffers, (GFunc) gst_data_unref, NULL);
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g_list_free (store->buffers);
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store->buffers = NULL;
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}
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/**
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* gst_buffer_store_new:
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*
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* Creates a new bufferstore.
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*
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* Returns: the new bufferstore.
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*/
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GstBufferStore *
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gst_buffer_store_new (void)
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{
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return GST_BUFFER_STORE (g_object_new (GST_TYPE_BUFFER_STORE, NULL));
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}
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/**
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* gst_buffer_store_clear:
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* @store: a bufferstore
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*
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* Clears the buffer store. All buffers are removed and the buffer store
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* behaves like it was just created.
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*/
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/* FIXME: call this function _reset ? */
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void
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gst_buffer_store_clear (GstBufferStore *store)
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{
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g_return_if_fail (GST_IS_BUFFER_STORE (store));
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g_signal_emit (store, gst_buffer_store_signals [CLEARED], 0, NULL);
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}
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/**
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* gst_buffer_store_add_buffer:
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* @store: a bufferstore
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* @buffer: the buffer to add
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*
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* Adds a buffer to the buffer store.
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*
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* Returns: TRUE, if the buffer was added, FALSE if an error occured.
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*/
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gboolean
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gst_buffer_store_add_buffer (GstBufferStore *store, GstBuffer *buffer)
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{
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gboolean ret;
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g_return_val_if_fail (GST_IS_BUFFER_STORE (store), FALSE);
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g_return_val_if_fail (GST_IS_BUFFER (buffer), FALSE);
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if (store->buffers &&
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GST_BUFFER_OFFSET_IS_VALID (store->buffers->data) &&
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!GST_BUFFER_OFFSET_IS_VALID (buffer))
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return FALSE;
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g_signal_emit (store, gst_buffer_store_signals [BUFFER_ADDED], 0, buffer, &ret);
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return ret;
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}
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/**
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* gst_buffer_store_get_buffer:
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* @store: a bufferstore
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* @offset: starting offset of returned buffer
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* @size: size of returned buffer
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*
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* Returns a buffer that corresponds to the given area of data. If part of the
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* data is not available inside the store, NULL is returned. You have to unref
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* the buffer after use.
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*
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* Returns: a buffer with the requested data or NULL if the data was not
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* available.
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*/
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GstBuffer *
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gst_buffer_store_get_buffer (GstBufferStore *store, guint64 offset, guint size)
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{
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GstBuffer *current;
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GList *walk;
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guint8 *data;
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guint tmp;
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guint64 cur_offset = 0;
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gboolean have_offset;
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GstBuffer *ret = NULL;
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g_return_val_if_fail (GST_IS_BUFFER_STORE (store), NULL);
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walk = store->buffers;
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if (!walk)
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return NULL;
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if (GST_BUFFER_OFFSET_IS_VALID (walk->data)) {
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have_offset = TRUE;
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} else {
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have_offset = FALSE;
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cur_offset = 0;
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}
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while (walk) {
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current = GST_BUFFER (walk->data);
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if (have_offset) {
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cur_offset = GST_BUFFER_OFFSET (current);
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}
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walk = g_list_next (walk);
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if (cur_offset > offset) {
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/* #include <windows.h>
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do_nothing_loop (); */
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} else if (cur_offset == offset &&
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GST_BUFFER_SIZE (current) == size) {
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GST_LOG_OBJECT (store, "found matching buffer %p for offset %"G_GUINT64_FORMAT" and size %u",
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current, offset, size);
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ret = current;
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gst_data_ref (GST_DATA (ret));
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GST_LOG_OBJECT (store, "refcount %d",
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GST_DATA_REFCOUNT_VALUE(ret));
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break;
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} else if (cur_offset + GST_BUFFER_SIZE (current) > offset) {
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if (cur_offset + GST_BUFFER_SIZE (current) >= offset + size) {
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ret = gst_buffer_create_sub (current, offset - cur_offset, size);
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GST_LOG_OBJECT (store, "created subbuffer %p from buffer %p for offset %llu and size %u",
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ret, current, offset, size);
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break;
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}
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/* uh, the requested data spans some buffers */
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ret = gst_buffer_new_and_alloc (size);
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GST_LOG_OBJECT (store, "created buffer %p for offset %"G_GUINT64_FORMAT
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" and size %u, will fill with data now",
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ret, offset, size);
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data = GST_BUFFER_DATA (ret);
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tmp = GST_BUFFER_SIZE (current) - offset + cur_offset;
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memcpy (data, GST_BUFFER_DATA (current) + offset - cur_offset, tmp);
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data += tmp;
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size -= tmp;
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while (size) {
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if (walk == NULL ||
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(have_offset &&
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GST_BUFFER_OFFSET (current) + GST_BUFFER_SIZE (current) != GST_BUFFER_OFFSET (walk->data))) {
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GST_DEBUG_OBJECT (store, "not all data for offset %"G_GUINT64_FORMAT" and remaining size %u available, aborting",
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offset, size);
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gst_data_unref (GST_DATA (ret));
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ret = NULL;
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goto out;
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}
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current = GST_BUFFER (walk->data);
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walk = g_list_next (walk);
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tmp = MIN (GST_BUFFER_SIZE (current), size);
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memcpy (data, GST_BUFFER_DATA (current), tmp);
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size -= tmp;
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}
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}
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if (!have_offset) {
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cur_offset += GST_BUFFER_SIZE (current);
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}
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}
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out:
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return ret;
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}
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/**
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* gst_buffer_store_get_size:
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* @store: a bufferstore
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* @offset: desired offset
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*
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* Calculates the number of bytes available starting from offset. This allows
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* to query a buffer with the returned size.
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*
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* Returns: the number of continuous bytes in the bufferstore starting at
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* offset.
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*/
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guint
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gst_buffer_store_get_size (GstBufferStore *store, guint64 offset)
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{
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GList *walk;
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guint64 cur_offset = 0;
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gboolean have_offset;
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gboolean counting = FALSE;
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GstBuffer *current = NULL;
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guint ret = 0;
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g_return_val_if_fail (GST_IS_BUFFER_STORE (store), 0);
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walk = store->buffers;
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if (!walk)
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return 0;
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if (GST_BUFFER_OFFSET_IS_VALID (walk->data)) {
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have_offset = TRUE;
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} else {
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have_offset = FALSE;
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cur_offset = 0;
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}
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while (walk) {
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if (have_offset && counting &&
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cur_offset + GST_BUFFER_SIZE (current) != GST_BUFFER_OFFSET (walk->data)) {
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break;
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}
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current = GST_BUFFER (walk->data);
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if (have_offset) {
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cur_offset = GST_BUFFER_OFFSET (current);
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}
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walk = g_list_next (walk);
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if (counting) {
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ret += GST_BUFFER_SIZE (current);
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} else {
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if (cur_offset > offset)
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return 0;
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if (cur_offset + GST_BUFFER_SIZE (current) > offset) {
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/* we have at least some bytes */
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ret = cur_offset + GST_BUFFER_SIZE (current) - offset;
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counting = TRUE;
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}
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}
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if (!have_offset) {
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cur_offset += GST_BUFFER_SIZE (current);
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}
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}
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return ret;
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}
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