+++ /dev/null
-/* 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, GstBufferStoreClass * g_class)
-{
- 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_mini_object_ref (GST_MINI_OBJECT (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_mini_object_ref (GST_MINI_OBJECT (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_mini_object_unref (GST_MINI_OBJECT (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) - start_offset,
- 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_mini_object_ref (GST_MINI_OBJECT (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_mini_object_ref (GST_MINI_OBJECT (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) {
- 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_mini_object_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_mini_object_ref (GST_MINI_OBJECT (ret));
- GST_LOG_OBJECT (store, "refcount %d", GST_MINI_OBJECT (ret)->refcount);
- 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_BUFFER_OFFSET (ret) = offset;
- 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_mini_object_unref (GST_MINI_OBJECT (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;
- }
- goto out;
- }
- 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;
-}
projects / platform / upstream / gstreamer.git / commitdiff