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libs/gst/bytestream/: removing obsolete files

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Original commit message from CVS:
* libs/gst/bytestream/.cvsignore:
* libs/gst/bytestream/Makefile.am:
* libs/gst/bytestream/adapter.c:
* libs/gst/bytestream/adapter.h:
* libs/gst/bytestream/bytestream.c:
* libs/gst/bytestream/bytestream.h:
* libs/gst/bytestream/filepad.c:
* libs/gst/bytestream/filepad.h:
removing obsolete files
This commit is contained in:
Stefan Kost 2005-08-26 13:17:54 +00:00
parent d915127028
commit 7d6e2cbfd5
9 changed files with 12 additions and 1771 deletions
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12
ChangeLog
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@ -1,3 +1,15 @@
2005-08-26 Stefan Kost <ensonic@users.sf.net>
* libs/gst/bytestream/.cvsignore:
* libs/gst/bytestream/Makefile.am:
* libs/gst/bytestream/adapter.c:
* libs/gst/bytestream/adapter.h:
* libs/gst/bytestream/bytestream.c:
* libs/gst/bytestream/bytestream.h:
* libs/gst/bytestream/filepad.c:
* libs/gst/bytestream/filepad.h:
removing obsolete files
2005-08-26 Stefan Kost <ensonic@users.sf.net>
* docs/gst/gstreamer-docs.sgml:

5
libs/gst/bytestream/.gitignore vendored
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@ -1,5 +0,0 @@
*.bb
*.bbg
*.da
*.def
*.gcno

10
libs/gst/bytestream/Makefile.am
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@ -1,10 +0,0 @@
plugin_LTLIBRARIES = libgstbytestream.la
libgstbytestreamincludedir = $(includedir)/gstreamer-@GST_MAJORMINOR@/gst/bytestream
libgstbytestreaminclude_HEADERS = bytestream.h adapter.h filepad.h
libgstbytestream_la_SOURCES = bytestream.c adapter.c filepad.c
libgstbytestream_la_CFLAGS = $(GST_OBJ_CFLAGS)
libgstbytestream_la_LIBS = $(GST_OBJ_LIBS)
libgstbytestream_la_LDFLAGS = $(GST_PLUGIN_LDFLAGS)

253
libs/gst/bytestream/adapter.c
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@ -1,253 +0,0 @@
/* GStreamer
* Copyright (C) 2004 Benjamin Otte <otte@gnome.org>
*
* 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 "adapter.h"
#include <string.h>
/* default size for the assembled data buffer */
#define DEFAULT_SIZE 16
GST_DEBUG_CATEGORY_STATIC (gst_adapter_debug);
#define GST_CAT_DEFAULT gst_adapter_debug
#define _do_init(thing) \
GST_DEBUG_CATEGORY_INIT (gst_adapter_debug, "GstAdapter", 0, "object to splice and merge buffers to desired size")
GST_BOILERPLATE_FULL (GstAdapter, gst_adapter, GObject, G_TYPE_OBJECT, _do_init)
static void gst_adapter_dispose (GObject * object);
static void gst_adapter_finalize (GObject * object);
static void gst_adapter_base_init (gpointer g_class)
{
}
static void
gst_adapter_class_init (GstAdapterClass * klass)
{
GObjectClass *object = G_OBJECT_CLASS (klass);
object->dispose = gst_adapter_dispose;
object->finalize = gst_adapter_finalize;
}
static void
gst_adapter_init (GstAdapter * adapter)
{
adapter->assembled_data = g_malloc (DEFAULT_SIZE);
adapter->assembled_size = DEFAULT_SIZE;
}
static void
gst_adapter_dispose (GObject * object)
{
GstAdapter *adapter = GST_ADAPTER (object);
gst_adapter_clear (adapter);
GST_CALL_PARENT (G_OBJECT_CLASS, dispose, (object));
}
static void
gst_adapter_finalize (GObject * object)
{
GstAdapter *adapter = GST_ADAPTER (object);
g_free (adapter->assembled_data);
GST_CALL_PARENT (G_OBJECT_CLASS, finalize, (object));
}
/**
* gst_adapter_new:
*
* Creates a new #GstAdapter.
*
* Returns: a new #GstAdapter
*/
GstAdapter *
gst_adapter_new (void)
{
return g_object_new (GST_TYPE_ADAPTER, NULL);
}
/**
* gst_adapter_clear:
* @adapter: the #GstAdapter to clear
*
* Removes all buffers from the @adapter.
*/
void
gst_adapter_clear (GstAdapter * adapter)
{
g_return_if_fail (GST_IS_ADAPTER (adapter));
g_slist_foreach (adapter->buflist, (GFunc) gst_data_unref, NULL);
g_slist_free (adapter->buflist);
adapter->buflist = NULL;
adapter->size = 0;
adapter->skip = 0;
adapter->assembled_len = 0;
}
/**
* gst_adapter_push:
* @adapter: a #GstAdapter
* @buf: the #GstBuffer to queue into the adapter
*
* Adds the data from @buf to the data stored inside @adapter and takes
* ownership of the buffer.
*/
void
gst_adapter_push (GstAdapter * adapter, GstBuffer * buf)
{
g_return_if_fail (GST_IS_ADAPTER (adapter));
g_return_if_fail (GST_IS_BUFFER (buf));
adapter->size += GST_BUFFER_SIZE (buf);
adapter->buflist = g_slist_append (adapter->buflist, buf);
}
/**
* gst_adapter_peek:
* @adapter: a #GstAdapter
* @size: number of bytes to peek
*
* Gets the first @size bytes stored in the @adapter. If this many bytes are
* not available, it returns NULL. The returned pointer is valid until the next
* function is called on the adapter.
*
* Returns: a pointer to the first @size bytes of data or NULL
*/
const guint8 *
gst_adapter_peek (GstAdapter * adapter, guint size)
{
GstBuffer *cur;
GSList *cur_list;
guint copied;
g_return_val_if_fail (GST_IS_ADAPTER (adapter), NULL);
g_return_val_if_fail (size > 0, NULL);
if (size > adapter->size)
return NULL;
if (adapter->assembled_len >= size)
return adapter->assembled_data;
cur = adapter->buflist->data;
if (GST_BUFFER_SIZE (cur) >= size + adapter->skip)
return GST_BUFFER_DATA (cur) + adapter->skip;
if (adapter->assembled_size < size) {
adapter->assembled_size = (size / DEFAULT_SIZE + 1) * DEFAULT_SIZE;
GST_DEBUG_OBJECT (adapter, "setting size of internal buffer to %u\n",
adapter->assembled_size);
adapter->assembled_data =
g_realloc (adapter->assembled_data, adapter->assembled_size);
}
adapter->assembled_len = size;
copied = GST_BUFFER_SIZE (cur) - adapter->skip;
memcpy (adapter->assembled_data, GST_BUFFER_DATA (cur) + adapter->skip,
copied);
cur_list = g_slist_next (adapter->buflist);
while (copied < size) {
g_assert (cur_list);
cur = cur_list->data;
cur_list = g_slist_next (cur_list);
memcpy (adapter->assembled_data + copied, GST_BUFFER_DATA (cur),
MIN (GST_BUFFER_SIZE (cur), size - copied));
copied = MIN (size, copied + GST_BUFFER_SIZE (cur));
}
return adapter->assembled_data;
}
/**
* gst_adapter_flush:
* @adapter: a #GstAdapter
* @flush: number of bytes to flush
*
* Flushes the first @flush bytes of the @adapter.
*/
void
gst_adapter_flush (GstAdapter * adapter, guint flush)
{
GstBuffer *cur;
g_return_if_fail (GST_IS_ADAPTER (adapter));
g_return_if_fail (flush > 0);
g_return_if_fail (flush <= adapter->size);
GST_LOG_OBJECT (adapter, "flushing %u bytes\n", flush);
adapter->size -= flush;
adapter->assembled_len = 0;
while (flush > 0) {
cur = adapter->buflist->data;
if (GST_BUFFER_SIZE (cur) <= flush + adapter->skip) {
/* can skip whole buffer */
flush -= GST_BUFFER_SIZE (cur) - adapter->skip;
adapter->skip = 0;
adapter->buflist = g_slist_remove (adapter->buflist, cur);
gst_data_unref (GST_DATA (cur));
} else {
adapter->skip += flush;
break;
}
}
}
/**
* gst_adapter_available:
* @adapter: a #GstAdapter
*
* Gets the maximum amount of bytes available, that is it returns the maximum
* value that can be supplied to gst_adapter_peek() without that function
* returning NULL.
*
* Returns: amount of bytes available in @adapter
*/
guint
gst_adapter_available (GstAdapter * adapter)
{
g_return_val_if_fail (GST_IS_ADAPTER (adapter), 0);
return adapter->size;
}
/**
* gst_adapter_available_fast:
* @adapter: a #GstAdapter
*
* Gets the maximum amount of bytes available without the need to do expensive
* operations (like copying the data into a temporary buffer).
*
* Returns: amount of bytes available in @adapter without expensive operations
*/
guint
gst_adapter_available_fast (GstAdapter * adapter)
{
g_return_val_if_fail (GST_IS_ADAPTER (adapter), 0);
if (!adapter->buflist)
return 0;
if (adapter->assembled_len)
return adapter->assembled_len;
g_assert (GST_BUFFER_SIZE (adapter->buflist->data) > adapter->skip);
return GST_BUFFER_SIZE (adapter->buflist->data) - adapter->skip;
}

75
libs/gst/bytestream/adapter.h
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@ -1,75 +0,0 @@
/* GStreamer
* Copyright (C) 2004 Benjamin Otte <otte@gnome.org>
*
* 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 <gst/gst.h>
#ifndef __GST_ADAPTER_H__
#define __GST_ADAPTER_H__
G_BEGIN_DECLS
#define GST_TYPE_ADAPTER \
(gst_adapter_get_type())
#define GST_ADAPTER(obj) \
(G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_ADAPTER,GstAdapter))
#define GST_ADAPTER_CLASS(klass) \
(G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_ADAPTER,GstAdapterClass))
#define GST_IS_ADAPTER(obj) \
(G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_ADAPTER))
#define GST_IS_ADAPTER_CLASS(obj) \
(G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_ADAPTER))
typedef struct _GstAdapter GstAdapter;
typedef struct _GstAdapterClass GstAdapterClass;
struct _GstAdapter {
GObject object;
GSList * buflist;
guint size;
guint skip;
/* we keep state of assembled pieces */
guint8 * assembled_data;
guint assembled_size;
guint assembled_len;
gpointer _gst_reserved[GST_PADDING];
};
struct _GstAdapterClass {
GObjectClass parent_class;
gpointer _gst_reserved[GST_PADDING];
};
GstAdapter * gst_adapter_new (void);
void gst_adapter_clear (GstAdapter *adapter);
void gst_adapter_push (GstAdapter *adapter, GstBuffer* buf);
const guint8 * gst_adapter_peek (GstAdapter *adapter, guint size);
void gst_adapter_flush (GstAdapter *adapter, guint flush);
guint gst_adapter_available (GstAdapter *adapter);
guint gst_adapter_available_fast (GstAdapter *adapter);
G_END_DECLS
#endif /* __GST_ADAPTER_H__ */

774
libs/gst/bytestream/bytestream.c
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@ -1,774 +0,0 @@
/* GStreamer
* Copyright (C) 2001 Erik Walthinsen <omega@temple-baptist.com>
*
* gstbytestream.c: adds a convenient bytestream based API to a pad.
*
* 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 <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <gst/gstinfo.h>
#include <gst/gstplugin.h>
#include <gst/gstversion.h>
#include <gst/gstutils.h>
#include "bytestream.h"
GST_DEBUG_CATEGORY_STATIC (debug_bs);
#define GST_CAT_DEFAULT debug_bs
static guint8 *gst_bytestream_assemble (GstByteStream * bs, guint32 len);
static inline void
gst_bytestream_init (GstByteStream * bs)
{
bs->event = NULL;
bs->buflist = NULL;
bs->headbufavail = 0;
bs->listavail = 0;
bs->assembled = NULL;
bs->offset = 0LL;
bs->in_seek = FALSE;
}
static inline void
gst_bytestream_exit (GstByteStream * bs)
{
GSList *walk;
if (bs->event)
gst_event_unref (bs->event);
walk = bs->buflist;
while (walk) {
gst_buffer_unref (GST_BUFFER (walk->data));
walk = g_slist_next (walk);
}
g_slist_free (bs->buflist);
g_free (bs->assembled);
}
/**
* gst_bytestream_new:
* @pad: the pad to attach the bytestream to
*
* creates a bytestream from the given pad
*
* Returns: a new #GstByteStream object.
*/
GstByteStream *
gst_bytestream_new (GstPad * pad)
{
GstByteStream *bs = g_new (GstByteStream, 1);
bs->pad = pad;
gst_bytestream_init (bs);
return bs;
}
/**
* gst_bytestream_destroy:
* @bs: the bytestream object to destroy
*
* destroy the bytestream object and free its resources.
*/
void
gst_bytestream_destroy (GstByteStream * bs)
{
gst_bytestream_exit (bs);
g_free (bs);
}
void
gst_bytestream_reset (GstByteStream * bs)
{
/* free all data */
gst_bytestream_exit (bs);
/* reset data to clean state */
gst_bytestream_init (bs);
}
/* HOW THIS WORKS:
*
* The fundamental structure is a singly-linked list of buffers. The
* buffer on the front is the oldest, and thus the first to read data
* from. The number of bytes left to be read in this buffer is stored
* in bs->headbufavail. The number of bytes available in the entire
* list (including the head buffer) is in bs->listavail.
*
* When a request is made for data (peek), _fill_bytes is called with
* the number of bytes needed, but only if the listavail indicates
* that there aren't already enough. This calls _get_next_buf until
* the listavail is sufficient to satisfy the demand.
*
* _get_next_buf pulls a buffer from the pad the bytestream is attached
* to, and shoves it in the list. There are actually two things it can
* do. If there's already a buffer in the list, and the _is_span_fast()
* test returns true, it will merge it with that last buffer. Otherwise
* it will simply tack it onto the end of the list.
*
* The _peek itself first checks the simple case of the request fitting
* within the head buffer, and if so creates a subbuffer and returns.
* Otherwise, it creates a new buffer and allocates space for the request
* and calls _assemble to fill it. We know we have to copy because this
* case only happens when the _merge wasn't feasible during _get_next_buf.
*
* The _flush method repeatedly inspects the head buffer and flushes as
* much data from it as it needs to, up to the size of the buffer. If
* the flush decimates the buffer, it's stripped, unref'd, and removed.
*/
/* get the next buffer
* if the buffer can be merged with the head buffer, do so
* else add it onto the head of the
*/
static gboolean
gst_bytestream_get_next_buf (GstByteStream * bs)
{
GstBuffer *nextbuf, *lastbuf, *headbuf;
GSList *end;
/* if there is an event pending, return FALSE */
if (bs->event)
return FALSE;
GST_DEBUG ("get_next_buf: pulling buffer");
gst_pad_pull (bs->pad, &nextbuf);
if (!nextbuf)
return FALSE;
if (GST_IS_EVENT (nextbuf)) {
bs->event = GST_EVENT (nextbuf);
return FALSE;
}
if (GST_BUFFER_TIMESTAMP_IS_VALID (nextbuf))
bs->last_ts = GST_BUFFER_TIMESTAMP (nextbuf);
GST_DEBUG ("get_next_buf: got buffer of %d bytes", GST_BUFFER_SIZE (nextbuf));
/* first see if there are any buffers in the list at all */
if (bs->buflist) {
GST_DEBUG ("gst_next_buf: there is at least one buffer in the list");
/* now find the end of the list */
end = g_slist_last (bs->buflist);
/* get the buffer that's there */
lastbuf = GST_BUFFER (end->data);
/* see if we can marge cheaply */
if (gst_buffer_is_span_fast (lastbuf, nextbuf)) {
GST_DEBUG ("get_next_buf: merging new buffer with last buf on list");
/* it is, let's merge them (this is really an append, but...) */
end->data = gst_buffer_merge (lastbuf, nextbuf);
/* add to the length of the list */
bs->listavail += GST_BUFFER_SIZE (nextbuf);
/* have to check to see if we merged with the head buffer */
if (end == bs->buflist) {
bs->headbufavail += GST_BUFFER_SIZE (nextbuf);
}
gst_buffer_unref (lastbuf);
gst_buffer_unref (nextbuf);
/* if we can't, we just append this buffer */
} else {
GST_DEBUG ("get_next_buf: adding new buffer to the end of the list");
end = g_slist_append (end, nextbuf);
/* also need to increment length of list and buffer count */
bs->listavail += GST_BUFFER_SIZE (nextbuf);
}
/* if there are no buffers in the list */
} else {
GST_DEBUG ("get_next_buf: buflist is empty, adding new buffer to list");
/* put this on the end of the list */
bs->buflist = g_slist_append (bs->buflist, nextbuf);
/* and increment the number of bytes in the list */
bs->listavail = GST_BUFFER_SIZE (nextbuf);
/* set the head buffer avail to the size */
bs->headbufavail = GST_BUFFER_SIZE (nextbuf);
}
/* a zero offset is a indication that we might need to set the timestamp */
if (bs->offset == 0LL) {
headbuf = GST_BUFFER (bs->buflist->data);
bs->offset = GST_BUFFER_OFFSET (headbuf);
}
return TRUE;
}
static gboolean
gst_bytestream_fill_bytes (GstByteStream * bs, guint32 len)
{
/* as long as we don't have enough, we get more buffers */
while (bs->listavail < len) {
GST_DEBUG ("fill_bytes: there are %d bytes in the list, we need %d",
bs->listavail, len);
if (!gst_bytestream_get_next_buf (bs))
return FALSE;
}
return TRUE;
}
/**
* gst_bytestream_peek:
* @bs: the bytestream to peek
* @buf: pointer to a variable that can hold a buffer pointer.
* @len: the number of bytes to peek
*
* Peeks len bytes into the bytestream, the result is returned as
* a #GstBuffer. Unref the buffer after usage.
* This function can return less bytes than requested. In that case,
* an event might have happened which you can retrieve with
* gst_bytestream_get_status().
*
* Returns: The number of bytes successfully peeked.
*/
guint32
gst_bytestream_peek (GstByteStream * bs, GstBuffer ** buf, guint32 len)
{
GstBuffer *headbuf, *retbuf = NULL;
g_return_val_if_fail (bs != NULL, 0);
g_return_val_if_fail (buf != NULL, 0);
if (len == 0)
return 0;
GST_DEBUG ("peek: asking for %d bytes", len);
/* make sure we have enough */
GST_DEBUG ("peek: there are %d bytes in the list", bs->listavail);
if (len > bs->listavail) {
if (!gst_bytestream_fill_bytes (bs, len)) {
/* we must have an event coming up */
if (bs->listavail > 0) {
/* we have some data left, len will be shrunk to the amount of data available */
len = bs->listavail;
} else {
/* there is no data */
*buf = retbuf;
return 0;
}
}
GST_DEBUG ("peek: there are now %d bytes in the list", bs->listavail);
}
gst_bytestream_print_status (bs);
/* extract the head buffer */
headbuf = GST_BUFFER (bs->buflist->data);
/* if the requested bytes are in the current buffer */
GST_DEBUG ("peek: headbufavail is %d", bs->headbufavail);
if (len <= bs->headbufavail) {
GST_DEBUG ("peek: there are enough bytes in headbuf (need %d, have %d)",
len, bs->headbufavail);
/* create a sub-buffer of the headbuf */
retbuf =
gst_buffer_create_sub (headbuf,
GST_BUFFER_SIZE (headbuf) - bs->headbufavail, len);
GST_BUFFER_OFFSET (retbuf) =
GST_BUFFER_OFFSET (headbuf) + GST_BUFFER_SIZE (headbuf) -
bs->headbufavail;
}
/* otherwise we need to figure out how to assemble one */
else {
GST_DEBUG ("peek: current buffer is not big enough for len %d", len);
retbuf = gst_buffer_new ();
GST_BUFFER_SIZE (retbuf) = len;
GST_BUFFER_DATA (retbuf) = gst_bytestream_assemble (bs, len);
GST_BUFFER_TIMESTAMP (retbuf) = bs->last_ts;
}
*buf = retbuf;
return len;
}
/**
* gst_bytestream_peek_bytes:
* @bs: the bytestream to peek
* @data: pointer to a variable that can hold a guint8 pointer.
* @len: the number of bytes to peek
*
* Peeks len bytes into the bytestream, the result is returned as
* a pointer to a guint8*. The data pointed to be data should not
* be freed and will become invalid after performing the next bytestream
* operation.
* This function can return less bytes than requested. In that case,
* an event might have happened which you can retrieve with
* gst_bytestream_get_status().
*
* Returns: The number of bytes successfully peeked.
*/
guint32
gst_bytestream_peek_bytes (GstByteStream * bs, guint8 ** data, guint32 len)
{
GstBuffer *headbuf;
g_return_val_if_fail (bs != NULL, 0);
g_return_val_if_fail (data != NULL, 0);
g_return_val_if_fail (len > 0, 0);
GST_DEBUG ("peek_bytes: asking for %d bytes", len);
if (bs->assembled) {
if (bs->assembled_len >= len) {
*data = bs->assembled;
return len;
}
g_free (bs->assembled);
bs->assembled = NULL;
}
/* make sure we have enough */
GST_DEBUG ("peek_bytes: there are %d bytes in the list", bs->listavail);
if (len > bs->listavail) {
if (!gst_bytestream_fill_bytes (bs, len)) {
/* we must have an event coming up */
if (bs->listavail > 0) {
/* we have some data left, len will be shrunk to the amount of data available */
len = bs->listavail;
} else {
/* there is no data */
*data = NULL;
return 0;
}
}
GST_DEBUG ("peek_bytes: there are now %d bytes in the list", bs->listavail);
}
gst_bytestream_print_status (bs);
/* extract the head buffer */
headbuf = GST_BUFFER (bs->buflist->data);
/* if the requested bytes are in the current buffer */
GST_DEBUG ("peek_bytes: headbufavail is %d", bs->headbufavail);
if (len <= bs->headbufavail) {
GST_DEBUG
("peek_bytes: there are enough bytes in headbuf (need %d, have %d)",
len, bs->headbufavail);
/* create a sub-buffer of the headbuf */
*data =
GST_BUFFER_DATA (headbuf) + (GST_BUFFER_SIZE (headbuf) -
bs->headbufavail);
}
/* otherwise we need to figure out how to assemble one */
else {
GST_DEBUG ("peek_bytes: current buffer is not big enough for len %d", len);
*data = gst_bytestream_assemble (bs, len);
bs->assembled = *data;
bs->assembled_len = len;
}
return len;
}
static guint8 *
gst_bytestream_assemble (GstByteStream * bs, guint32 len)
{
guint8 *data = g_malloc (len);
GSList *walk;
guint32 copied = 0;
GstBuffer *buf;
/* copy the data from the curbuf */
buf = GST_BUFFER (bs->buflist->data);
GST_DEBUG ("assemble: copying %d bytes from curbuf at %d to *data",
bs->headbufavail, GST_BUFFER_SIZE (buf) - bs->headbufavail);
memcpy (data,
GST_BUFFER_DATA (buf) + GST_BUFFER_SIZE (buf) - bs->headbufavail,
bs->headbufavail);
copied += bs->headbufavail;
/* asumption is made that the buffers all exist in the list */
walk = g_slist_next (bs->buflist);
while (copied < len) {
buf = GST_BUFFER (walk->data);
if (GST_BUFFER_SIZE (buf) < (len - copied)) {
GST_DEBUG ("assemble: copying %d bytes from buf to output offset %d",
GST_BUFFER_SIZE (buf), copied);
memcpy (data + copied, GST_BUFFER_DATA (buf), GST_BUFFER_SIZE (buf));
copied += GST_BUFFER_SIZE (buf);
} else {
GST_DEBUG ("assemble: copying %d bytes from buf to output offset %d",
len - copied, copied);
memcpy (data + copied, GST_BUFFER_DATA (buf), len - copied);
copied = len;
}
walk = g_slist_next (walk);
}
return data;
}
/**
* gst_bytestream_flush:
* @bs: the bytestream to flush
* @len: the number of bytes to flush
*
* Flush len bytes from the bytestream.
* This function can return FALSE when the number of
* bytes could not be flushed due to an event. In that case,
* you can get the number of available bytes before the event
* with gst_bytestream_get_status().
*
* Returns: TRUE if the number of bytes could be flushed.
*/
gboolean
gst_bytestream_flush (GstByteStream * bs, guint32 len)
{
GST_DEBUG ("flush: flushing %d bytes", len);
if (len == 0)
return TRUE;
/* make sure we have enough */
GST_DEBUG ("flush: there are %d bytes in the list", bs->listavail);
if (len > bs->listavail) {
if (!gst_bytestream_fill_bytes (bs, len)) {
return FALSE;
}
GST_DEBUG ("flush: there are now %d bytes in the list", bs->listavail);
}
gst_bytestream_flush_fast (bs, len);
return TRUE;
}
/**
* gst_bytestream_flush_fast:
* @bs: the bytestream to flush
* @len: the number of bytes to flush
*
* Flushes len bytes from the bytestream. This function
* is faster than gst_bytestream_flush() but only works
* when you have recently peeked no less than len bytes
* with gst_bytestream_peek() or gst_bytestream_peek_bytes().
*/
void
gst_bytestream_flush_fast (GstByteStream * bs, guint32 len)
{
GstBuffer *headbuf;
if (len == 0)
return;
g_assert (len <= bs->listavail);
if (bs->assembled) {
g_free (bs->assembled);
bs->assembled = NULL;
}
/* update the byte offset */
bs->offset += len;
/* repeat until we've flushed enough data */
while (len > 0) {
headbuf = GST_BUFFER (bs->buflist->data);
GST_DEBUG ("flush: analyzing buffer that's %d bytes long, offset %"
G_GUINT64_FORMAT, GST_BUFFER_SIZE (headbuf),
GST_BUFFER_OFFSET (headbuf));
/* if there's enough to complete the flush */
if (bs->headbufavail > len) {
/* just trim it off */
GST_DEBUG ("flush: trimming %d bytes off end of headbuf", len);
bs->headbufavail -= len;
bs->listavail -= len;
len = 0;
/* otherwise we have to trim the whole buffer */
} else {
GST_DEBUG ("flush: removing head buffer completely");
/* remove it from the list */
bs->buflist = g_slist_delete_link (bs->buflist, bs->buflist);
/* trim it from the avail size */
bs->listavail -= bs->headbufavail;
/* record that we've trimmed this many bytes */
len -= bs->headbufavail;
/* unref it */
gst_buffer_unref (headbuf);
/* record the new headbufavail */
if (bs->buflist) {
bs->headbufavail = GST_BUFFER_SIZE (GST_BUFFER (bs->buflist->data));
GST_DEBUG ("flush: next headbuf is %d bytes", bs->headbufavail);
} else {
GST_DEBUG ("flush: no more bytes at all");
}
}
GST_DEBUG ("flush: bottom of while(), len is now %d", len);
}
}
/**
* gst_bytestream_seek:
* @bs: the bytestream to seek
* @offset: the byte offset to seek to
* @method: the seek method.
*
* Perform a seek on the bytestream to the given offset.
* The method can be one of GST_SEEK_METHOD_CUR, GST_SEEK_METHOD_SET,
* GST_SEEK_METHOD_END.
* This seek will also flush any pending data in the bytestream or
* peer elements.
*
* Returns: TRUE when the seek succeeded.
*/
gboolean
gst_bytestream_seek (GstByteStream * bs, gint64 offset, GstSeekType method)
{
GstRealPad *peer;
g_return_val_if_fail (bs != NULL, FALSE);
peer = GST_RPAD_PEER (bs->pad);
GST_DEBUG ("bs: send event");
if (gst_pad_send_event (GST_PAD (peer), gst_event_new_seek (GST_FORMAT_BYTES |
(method & GST_SEEK_METHOD_MASK) |
GST_SEEK_FLAG_FLUSH | GST_SEEK_FLAG_ACCURATE, offset))) {
gst_bytestream_flush_fast (bs, bs->listavail);
/* we set the seek flag here. We cannot pull the pad here
* bacause a seek might occur outisde of the pads cothread context */
bs->in_seek = TRUE;
return TRUE;
}
GST_DEBUG ("bs: send event failed\n");
return FALSE;
}
/**
* gst_bytestream_tell
* @bs: a bytestream
*
* Get the current byteoffset in the bytestream.
*
* Returns: the offset or -1 on error.
*/
guint64
gst_bytestream_tell (GstByteStream * bs)
{
GstFormat format;
gint64 value;
g_return_val_if_fail (bs != NULL, -1);
format = GST_FORMAT_BYTES;
if (gst_pad_query (GST_PAD_PEER (bs->pad), GST_QUERY_POSITION, &format,
&value)) {
return value - bs->listavail;
}
return -1;
}
/**
* gst_bytestream_length
* @bs: a bytestream
*
* Get the total length of the bytestream.
*
* Returns: the total length or -1 on error.
*/
guint64
gst_bytestream_length (GstByteStream * bs)
{
GstFormat format;
gint64 value;
g_return_val_if_fail (bs != NULL, -1);
format = GST_FORMAT_BYTES;
if (gst_pad_query (GST_PAD_PEER (bs->pad), GST_QUERY_TOTAL, &format, &value))
return value;
return -1;
}
/**
* gst_bytestream_read:
* @bs: the bytestream to read
* @buf: pointer to a variable that can hold a buffer pointer.
* @len: the number of bytes to read
*
* Read len bytes from the bytestream, the result is returned as
* a #GstBuffer. Unref the buffer after usage.
* This function can return less bytes than requested. In that case,
* an event might have happened which you can retrieve with
* gst_bytestream_get_status().
*
* Returns: The number of bytes successfully read.
*/
guint32
gst_bytestream_read (GstByteStream * bs, GstBuffer ** buf, guint32 len)
{
guint32 len_peeked;
g_return_val_if_fail (bs != NULL, -1);
len_peeked = gst_bytestream_peek (bs, buf, len);
if (len_peeked == 0)
return 0;
gst_bytestream_flush_fast (bs, len_peeked);
return len_peeked;
}
/**
* gst_bytestream_size_hint
* @bs: a bytestream
* @size: the size to hint
*
* Give a hint that we are going to read chunks of the given size.
* Giving size hints to the peer element might improve performance
* since less buffers need to be merged.
*
* Returns: TRUE if the hint was accepted.
*/
gboolean
gst_bytestream_size_hint (GstByteStream * bs, guint32 size)
{
GstEvent *event;
g_return_val_if_fail (bs != NULL, FALSE);
event = gst_event_new_size (GST_FORMAT_BYTES, size);
return gst_pad_send_event (GST_PAD_PEER (bs->pad), event);
}
/**
* gst_bytestream_get_status
* @bs: a bytestream
* @avail_out: total number of bytes buffered
* @event_out: an event
*
* When an event occurs, the bytestream operations return a value less
* than the requested length. You must retrieve the event using this API
* before reading more bytes from the stream.
*/
void
gst_bytestream_get_status (GstByteStream * bs,
guint32 * avail_out, GstEvent ** event_out)
{
if (avail_out)
*avail_out = bs->listavail;
if (event_out) {
*event_out = bs->event;
bs->event = NULL;
}
}
/**
* gst_bytestream_get_timestamp
* @bs: a bytestream
*
* Get the timestamp of the first data in the bytestream. If no data
* exists 1 byte is read to load a new buffer.
*
* This function will not check input buffer boundries. It is possible
* the next read could span two or more input buffers with different
* timestamps.
*
* Returns: a timestamp.
*/
guint64
gst_bytestream_get_timestamp (GstByteStream * bs)
{
GstBuffer *headbuf;
g_return_val_if_fail (bs != NULL, 0);
GST_DEBUG ("get_timestamp: getting timestamp");
/* make sure we have a buffer */
if (bs->listavail == 0) {
GST_DEBUG ("gst_timestamp: fetching a buffer");
if (!gst_bytestream_fill_bytes (bs, 1))
return 0;
}
/* extract the head buffer */
headbuf = GST_BUFFER (bs->buflist->data);
return GST_BUFFER_TIMESTAMP (headbuf);
}
/**
* gst_bytestream_print_status
* @bs: a bytestream
*
* Print the current status of the bytestream object. mainly
* used for debugging purposes.
*/
void
gst_bytestream_print_status (GstByteStream * bs)
{
GSList *walk;
GstBuffer *buf;
GST_DEBUG ("STATUS: head buffer has %d bytes available", bs->headbufavail);
GST_DEBUG ("STATUS: list has %d bytes available", bs->listavail);
walk = bs->buflist;
while (walk) {
buf = GST_BUFFER (walk->data);
walk = g_slist_next (walk);
GST_DEBUG ("STATUS: buffer starts at %" G_GUINT64_FORMAT
" and is %d bytes long", GST_BUFFER_OFFSET (buf),
GST_BUFFER_SIZE (buf));
}
}
static gboolean
plugin_init (GstPlugin * plugin)
{
GST_DEBUG_CATEGORY_INIT (debug_bs, "bytestream", 0, "bytestream library");
return TRUE;
}
GST_PLUGIN_DEFINE (GST_VERSION_MAJOR,
GST_VERSION_MINOR,
"gstbytestream",
"a byte-oriented layer on top of buffer-passing",
plugin_init, VERSION, GST_LICENSE, GST_PACKAGE, GST_ORIGIN)

75
libs/gst/bytestream/bytestream.h
View file

@ -1,75 +0,0 @@
/* GStreamer
* Copyright (C) 2001 Erik Walthinsen <omega@temple-baptist.com>
*
* 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.
*/
#ifndef __GST_BYTESTREAM_H__
#define __GST_BYTESTREAM_H__
#include <glib.h>
#include <gst/gstpad.h>
#include <gst/gstevent.h>
G_BEGIN_DECLS
typedef struct _GstByteStream GstByteStream;
struct _GstByteStream {
GstPad *pad;
GstEvent *event;
GSList *buflist;
guint32 headbufavail;
guint32 listavail;
/* we keep state of assembled pieces */
guint8 *assembled;
guint32 assembled_len; /* only valid when assembled != NULL */
/* this is needed for gst_bytestream_tell */
guint64 offset;
guint64 last_ts;
/* if we are in the seek state (waiting for DISCONT) */
gboolean in_seek;
gpointer _gst_reserved[GST_PADDING];
};
GstByteStream* gst_bytestream_new (GstPad *pad);
void gst_bytestream_destroy (GstByteStream *bs);
void gst_bytestream_reset (GstByteStream *bs);
guint32 gst_bytestream_read (GstByteStream *bs, GstBuffer** buf, guint32 len);
guint64 gst_bytestream_tell (GstByteStream *bs);
guint64 gst_bytestream_length (GstByteStream *bs);
gboolean gst_bytestream_size_hint (GstByteStream *bs, guint32 size);
gboolean gst_bytestream_seek (GstByteStream *bs, gint64 offset, GstSeekType method);
guint32 gst_bytestream_peek (GstByteStream *bs, GstBuffer** buf, guint32 len);
guint32 gst_bytestream_peek_bytes (GstByteStream *bs, guint8** data, guint32 len);
gboolean gst_bytestream_flush (GstByteStream *bs, guint32 len);
void gst_bytestream_flush_fast (GstByteStream *bs, guint32 len);
void gst_bytestream_get_status (GstByteStream *bs, guint32 *avail_out, GstEvent **event_out);
guint64 gst_bytestream_get_timestamp (GstByteStream *bs);
void gst_bytestream_print_status (GstByteStream *bs);
G_END_DECLS
#endif /* __GST_BYTESTREAM_H__ */

482
libs/gst/bytestream/filepad.c
View file

@ -1,482 +0,0 @@
/* GStreamer
* Copyright (C) 2004 Benjamin Otte <otte@gnome.org>
*
* 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 "filepad.h"
#include <string.h> /* memcpy */
#define RETURN_IF_FAIL(pad,check,error) G_STMT_START { \
if (!(check)) { \
GST_LOG_OBJECT (pad, "setting error to %d: " #error, error); \
pad->error_number = error; \
return -error; \
} \
} G_STMT_END
GST_DEBUG_CATEGORY_STATIC (gst_file_pad_debug);
#define GST_CAT_DEFAULT gst_file_pad_debug
#define _do_init(thing) \
GST_DEBUG_CATEGORY_INIT (gst_file_pad_debug, "GstFilePad", 0, "object to splice and merge buffers to dewsired size")
GST_BOILERPLATE_FULL (GstFilePad, gst_file_pad, GstRealPad, GST_TYPE_REAL_PAD,
_do_init)
static void gst_file_pad_dispose (GObject * object);
static void gst_file_pad_finalize (GObject * object);
//static void gst_file_pad_chain (GstPad * pad, GstData * data);
static void gst_file_pad_parent_set (GstObject * object,
GstObject * parent);
static void gst_file_pad_base_init (gpointer g_class)
{
}
static void
gst_file_pad_class_init (GstFilePadClass * klass)
{
GstObjectClass *gst = GST_OBJECT_CLASS (klass);
GObjectClass *object = G_OBJECT_CLASS (klass);
object->dispose = gst_file_pad_dispose;
object->finalize = gst_file_pad_finalize;
gst->parent_set = gst_file_pad_parent_set;
}
static void
gst_file_pad_init (GstFilePad * pad)
{
GstRealPad *real = GST_REAL_PAD (pad);
/* must do this for set_chain_function to work */
real->direction = GST_PAD_SINK;
//gst_pad_set_chain_function (GST_PAD (real), gst_file_pad_chain);
pad->adapter = gst_adapter_new ();
pad->in_seek = FALSE;
pad->eos = FALSE;
pad->iterate_func = NULL;
pad->event_func = gst_pad_event_default;
}
static void
gst_file_pad_dispose (GObject * object)
{
GstFilePad *file_pad = GST_FILE_PAD (object);
gst_adapter_clear (file_pad->adapter);
GST_CALL_PARENT (G_OBJECT_CLASS, dispose, (object));
}
static void
gst_file_pad_finalize (GObject * object)
{
GstFilePad *file_pad = GST_FILE_PAD (object);
g_object_unref (file_pad->adapter);
GST_CALL_PARENT (G_OBJECT_CLASS, finalize, (object));
}
#if 0
static void
gst_file_pad_chain (GstPad * gst_pad, GstData * data)
{
GstFilePad *pad = GST_FILE_PAD (gst_pad);
gboolean got_value;
gint64 value;
if (GST_IS_EVENT (data)) {
GstEvent *event = GST_EVENT (data);
/* INSERT ME */
switch (GST_EVENT_TYPE (event)) {
case GST_EVENT_DISCONTINUOUS:
got_value =
gst_event_discont_get_value (event, GST_FORMAT_BYTES, &value);
if (!got_value)
got_value =
gst_event_discont_get_value (event, GST_FORMAT_DEFAULT, &value);
if (pad->in_seek) {
/* discard broken disconts */
if ((pad->position >= 0) && got_value && (value != pad->position)) {
GST_DEBUG_OBJECT (pad,
"unexpected discont during seek (want %" G_GINT64_FORMAT
", got %" G_GINT64_FORMAT "), discarding", pad->position,
value);
break;
}
if (got_value) {
GST_INFO_OBJECT (pad, "got discont to %" G_GINT64_FORMAT, value);
pad->position = value;
} else {
GST_ERROR_OBJECT (pad, "got discont without position");
if (pad->position == -1) {
GST_WARNING_OBJECT (pad,
"need to reset position to 0 because we have no position info");
pad->position = 0;
}
}
pad->in_seek = FALSE;
} else {
/* we're not seeking, what does the event want from us? */
if (!got_value ||
value != pad->position + gst_adapter_available (pad->adapter)) {
/* discont doesn't match position */
GST_WARNING_OBJECT (pad, "DISCONT arrived to %" G_GINT64_FORMAT
", we're expecting %" G_GINT64_FORMAT " though", value,
pad->position + gst_adapter_available (pad->adapter));
/* off to event function, let the user decide */
break;
}
}
gst_event_unref (event);
return;
case GST_EVENT_EOS:
pad->eos = TRUE;
gst_event_unref (event);
g_return_if_fail (pad->iterate_func);
pad->iterate_func (pad);
return;
default:
break;
}
g_return_if_fail (pad->event_func);
pad->event_func (gst_pad, event);
} else {
if (pad->in_seek) {
GST_DEBUG_OBJECT (pad, "discarding buffer %p, we're seeking", data);
gst_data_unref (data);
} else {
gst_adapter_push (pad->adapter, GST_BUFFER (data));
g_return_if_fail (pad->iterate_func);
pad->iterate_func (pad);
}
}
}
#endif
static void
gst_file_pad_parent_set (GstObject * object, GstObject * parent)
{
GstElement *element;
/* FIXME: we can only be added to elements, right? */
element = GST_ELEMENT (parent);
//if (element->loopfunc)
// g_warning ("attempt to add a GstFilePad to a loopbased element.");
GST_CALL_PARENT (GST_OBJECT_CLASS, parent_set, (object, parent));
}
/**
* gst_file_pad_new:
* @templ: the #GstPadTemplate to use
* @name: name of the pad
*
* creates a new file pad. Note that the template must be a sink template.
*
* Returns: the new file pad.
*/
GstPad *
gst_file_pad_new (GstPadTemplate * templ, gchar * name)
{
g_return_val_if_fail (GST_IS_PAD_TEMPLATE (templ), NULL);
g_return_val_if_fail (GST_PAD_TEMPLATE_DIRECTION (templ) == GST_PAD_SINK,
NULL);
g_return_val_if_fail (name != NULL, NULL);
return gst_pad_custom_new_from_template (GST_TYPE_FILE_PAD, templ, name);
}
/**
* gst_file_pad_set_event_function:
* @pad: a #GstFilePad
* @event: the #GstPadEventFunction to use
*
* sets the function to use for handling events arriving on the pad, that aren't
* intercepted by the pad. The pad intercepts EOS and DISCONT events for its own
* usage. An exception are unexpected DISCONT events that signal discontinuities
* in the data stream. So when your event function receives a DISCONT event, it has
* to decide what to do with a hole of data coming up.
* If you don't set one, gst_pad_event_default() will be used.
*/
void
gst_file_pad_set_event_function (GstFilePad * pad, GstPadEventFunction event)
{
g_return_if_fail (GST_IS_FILE_PAD (pad));
g_return_if_fail (event != NULL);
pad->event_func = event;
}
/**
* gst_file_pad_set_iterate_function:
* @pad: a #GstFilePad
* @iterate: the #GstFilePadIterateFunction to use
*
* Sets the iterate function of the pad. Don't use chain functions with file
* pads, they are used internally. The iteration function is called whenever
* there is new data to process. You can then use operations like
* gst_file_pad_read() to get the data.
*/
void
gst_file_pad_set_iterate_function (GstFilePad * pad,
GstFilePadIterateFunction iterate)
{
g_return_if_fail (GST_IS_FILE_PAD (pad));
g_return_if_fail (iterate != NULL);
pad->iterate_func = iterate;
}
/**
* gst_file_pad_read:
* @pad: a #GstFilePad
* @buf: buffer to fill
* @count: number of bytes to put into buffer
*
* read @count bytes from the @pad into the buffer starting at @buf.
* Note that this function does not return less bytes even in the EOS case.
*
* Returns: On success, @count is returned, and the file position is
* advanced by this number. 0 indicates end of stream.
* On error, -errno is returned, and the errno of the pad is set
* appropriately. In this case the file position will not change.
*/
gint64
gst_file_pad_read (GstFilePad * pad, void *buf, gint64 count)
{
const guint8 *data;
/* FIXME: set pad's errno? */
g_return_val_if_fail (GST_IS_FILE_PAD (pad), -EBADF);
g_return_val_if_fail (buf != NULL, -EFAULT);
g_return_val_if_fail (count >= 0, -EINVAL);
if (gst_file_pad_eof (pad))
return 0;
data = gst_adapter_peek (pad->adapter, count);
RETURN_IF_FAIL (pad, data != NULL, EAGAIN);
memcpy (buf, data, count);
gst_adapter_flush (pad->adapter, count);
pad->position += count;
return count;
}
/**
* gst_file_pad_try_read:
* @pad: a #GstFilePad
* @buf: buffer to fill
* @count: number of bytes to put into buffer
*
* Attempts to read up to @count bytes into the buffer pointed to by @buf.
* This function is modeled after the libc read() function.
*
* Returns: On success, the number of bytes read is returned, and the file
* position is advanced by this number. 0 indicates end of stream.
* On error, -errno is returned, and the errno of the pad is set
* appropriately. In this case the file position will not change.
* Note that the number of bytes read may and often will be
* smaller then @count. If you don't want this behaviour, use
* gst_file_pad_read() instead.
**/
gint64
gst_file_pad_try_read (GstFilePad * pad, void *buf, gint64 count)
{
g_return_val_if_fail (GST_IS_FILE_PAD (pad), -EBADF);
g_return_val_if_fail (buf != NULL, -EFAULT);
g_return_val_if_fail (count >= 0, -EINVAL);
count = MIN (count, (gint64) gst_adapter_available (pad->adapter));
return gst_file_pad_read (pad, buf, count);
}
/**
* gst_file_pad_seek:
* @pad: a #GstFilePad
* @offset: new offset to start reading from
* @whence: specifies relative to which position @offset should be interpreted
*
* Sets the new position to read from to @offset bytes relative to @whence. This
* function is modelled after the fseek() libc function.
*
* Returns: 0 on success, a negative error number on failure.
*/
int
gst_file_pad_seek (GstFilePad * pad, gint64 offset, GstSeekType whence)
{
GstEvent *event;
g_return_val_if_fail (GST_IS_FILE_PAD (pad), -EBADF);
g_return_val_if_fail ((whence & (GST_SEEK_METHOD_CUR | GST_SEEK_METHOD_SET |
GST_SEEK_METHOD_END)) == whence, -EINVAL);
g_return_val_if_fail (whence != 0, -EINVAL);
RETURN_IF_FAIL (pad, GST_PAD_PEER (pad), EBADF); /* FIXME: better return val? */
/* adjust offset by number of bytes buffered */
if (whence & GST_SEEK_METHOD_CUR)
offset -= gst_adapter_available (pad->adapter);
event =
gst_event_new_seek (whence | GST_SEEK_FLAG_FLUSH | GST_SEEK_FLAG_ACCURATE
| GST_FORMAT_BYTES, offset);
RETURN_IF_FAIL (pad, gst_pad_send_event (GST_PAD_PEER (pad), event), EBADF);
GST_DEBUG_OBJECT (pad,
"seeking to position %" G_GINT64_FORMAT " relative to %s", offset,
whence == GST_SEEK_METHOD_CUR ? "start" : whence ==
GST_SEEK_METHOD_SET ? "current" : "end");
switch (whence) {
case GST_SEEK_METHOD_SET:
pad->position = offset;
break;
case GST_SEEK_METHOD_CUR:
pad->position += offset + gst_adapter_available (pad->adapter);
break;
case GST_SEEK_METHOD_END:
/* FIXME: query length and use that */
pad->position = -1;
break;
default:
g_assert_not_reached ();
break;
}
gst_adapter_clear (pad->adapter);
pad->in_seek = TRUE;
pad->eos = FALSE;
return 0;
}
/**
* gst_file_pad_tell:
* @pad: a #GstFilePad
*
* gets the current position inside the stream if the position is available. If
* the position is not available due to a pending seek, it returns -EAGAIN. If
* the stream does not provide this information, -EBADF is returned. The @pad's
* errno is set apropriatly. This function is modeled after the ftell() libc
* function.
*
* Returns: The position or a negative error code.
*/
gint64
gst_file_pad_tell (GstFilePad * pad)
{
g_return_val_if_fail (GST_IS_FILE_PAD (pad), -EBADF);
RETURN_IF_FAIL (pad, !(pad->position < 0 && pad->in_seek), EAGAIN);
RETURN_IF_FAIL (pad, pad->position >= 0, EBADF);
return pad->position;
}
/**
* gst_file_pad_error:
* @pad: a #GstFilePad
*
* Gets the last error. This is modeled after the ferror() function from libc.
*
* Returns: Number of the last error or 0 if there hasn't been an error yet.
*/
int
gst_file_pad_error (GstFilePad * pad)
{
g_return_val_if_fail (GST_IS_FILE_PAD (pad), 0);
return pad->error_number;
}
/**
* gst_file_pad_eof:
* @pad: a #GstFilePad
*
* Checks if the EOS has been reached. This function is modeled after the
* function feof() from libc.
*
* Returns: non-zero if EOS has been reached, zero if not.
**/
int
gst_file_pad_eof (GstFilePad * pad)
{
g_return_val_if_fail (GST_IS_FILE_PAD (pad), 0);
if (pad->in_seek)
return 0;
if (gst_adapter_available (pad->adapter))
return 0;
if (!pad->eos)
return 0;
return 1;
}
/**
* gst_file_pad_available:
* @pad: a #GstFilePad
*
* Use this function to figure out the maximum number of bytes that can be read
* via gst_file_pad_read() without that function returning -EAGAIN.
*
* Returns: the number of bytes available in the file pad.
*/
guint
gst_file_pad_available (GstFilePad * pad)
{
g_return_val_if_fail (GST_IS_FILE_PAD (pad), 0);
return gst_adapter_available (pad->adapter);
}
/**
* gst_file_pad_get_length:
* @pad: a #GstFilePad
*
* Gets the length in bytes of the @pad.
*
* Returns: length in bytes or -1 if not available
*/
gint64
gst_file_pad_get_length (GstFilePad * pad)
{
GstFormat format = GST_FORMAT_BYTES;
gint64 length;
GstPad *peer;
g_return_val_if_fail (GST_IS_FILE_PAD (pad), -1);
/* we query the length every time to avoid issues with changing lengths */
peer = GST_PAD_PEER (pad);
if (!peer)
return -1;
if (gst_pad_query (peer, GST_QUERY_TOTAL, &format, &length))
return length;
format = GST_FORMAT_DEFAULT;
if (gst_pad_query (peer, GST_QUERY_TOTAL, &format, &length))
return length;
return -1;
}

97
libs/gst/bytestream/filepad.h
View file

@ -1,97 +0,0 @@
/* GStreamer
* Copyright (C) 2004 Benjamin Otte <otte@gnome.org>
*
* 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 <gst/gst.h>
#include <gst/bytestream/adapter.h>
#ifndef __GST_FILE_PAD_H__
#define __GST_FILE_PAD_H__
G_BEGIN_DECLS
#define GST_TYPE_FILE_PAD \
(gst_file_pad_get_type())
#define GST_FILE_PAD(obj) \
(G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_FILE_PAD,GstFilePad))
#define GST_FILE_PAD_CLASS(klass) \
(G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_FILE_PAD,GstFilePadClass))
#define GST_IS_FILE_PAD(obj) \
(G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_FILE_PAD))
#define GST_IS_FILE_PAD_CLASS(obj) \
(G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_FILE_PAD))
typedef struct _GstFilePad GstFilePad;
typedef struct _GstFilePadClass GstFilePadClass;
typedef void (* GstFilePadIterateFunction) (GstFilePad *pad);
struct _GstFilePad {
GstRealPad pad;
GstAdapter * adapter;
gint64 position; /* FIXME: add to adapter? */
gboolean in_seek;
gboolean eos;
int error_number;
GstFilePadIterateFunction iterate_func;
GstPadEventFunction event_func;
gpointer _gst_reserved[GST_PADDING];
};
struct _GstFilePadClass {
GstRealPadClass parent_class;
gpointer _gst_reserved[GST_PADDING];
};
GType gst_file_pad_get_type (void);
/* FIXME: need this? */
GstPad * gst_file_pad_new (GstPadTemplate* templ,
gchar *name);
void gst_file_pad_set_event_function (GstFilePad *file_pad,
GstPadEventFunction event);
void gst_file_pad_set_iterate_function (GstFilePad *file_pad,
GstFilePadIterateFunction iterate);
guint gst_file_pad_available (GstFilePad *pad);
gint64 gst_file_pad_get_length (GstFilePad *pad);
/* this is a file like interface */
/* FIXME: is gint64 the correct type? (it must be signed to get error return vals */
gint64 gst_file_pad_read (GstFilePad *pad,
void *buf,
gint64 count);
gint64 gst_file_pad_try_read (GstFilePad *pad,
void *buf,
gint64 count);
int gst_file_pad_seek (GstFilePad *pad,
gint64 offset,
GstSeekType whence);
gint64 gst_file_pad_tell (GstFilePad *pad);
int gst_file_pad_error (GstFilePad *pad);
int gst_file_pad_eof (GstFilePad *pad);
G_END_DECLS
#endif /* __GST_FILE_PAD_H__ */