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moving bytestream in the same way as in gst-plugins since ac3parse needs it

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Original commit message from CVS:
moving bytestream in the same way as in gst-plugins since ac3parse needs it
This commit is contained in:
Thomas Vander Stichele 2001-12-23 00:07:59 +00:00
parent 467035ce70
commit 2b20b7178f
5 changed files with 824 additions and 0 deletions
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3
libs/gst/Makefile.am Normal file
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SUBDIRS = bytestream
DIST_SUBDIRS = bytestream

15
libs/gst/bytestream/Makefile.am Normal file
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libdir = $(libdir)/gst
lib_LTLIBRARIES = libgstbytestream.la libgstbstest.la
libgstbytestream_la_SOURCES = bytestream.c
libgstbstest_la_SOURCES = bstest.c
libgstbytestreamincludedir = $(includedir)/gst/bytestream
libgstbytestreaminclude_HEADERS = bytestream.h
libgstbytestream_la_LIBADD = $(GST_LIBS)
libgstbytestream_la_CFLAGS = $(GST_CFLAGS)
libgstbstest_la_LIBADD = $(GST_LIBS)
libgstbstest_la_CFLAGS = $(GST_CFLAGS)

294
libs/gst/bytestream/bstest.c Normal file
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/* GStreamer
* Copyright (C) 1999,2000 Erik Walthinsen <omega@cse.ogi.edu>
* 2000 Wim Taymans <wtay@chello.be>
*
* gstidentity.c:
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#include <gst/gst.h>
#include "gstbytestream.h"
#define GST_TYPE_IDENTITY \
(gst_identity_get_type())
#define GST_IDENTITY(obj) \
(G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_IDENTITY,GstIdentity))
#define GST_IDENTITY_CLASS(klass) \
(G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_IDENTITY,GstIdentityClass))
#define GST_IS_IDENTITY(obj) \
(G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_IDENTITY))
#define GST_IS_IDENTITY_CLASS(obj) \
(G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_IDENTITY))
typedef struct _GstIdentity GstIdentity;
typedef struct _GstIdentityClass GstIdentityClass;
struct _GstIdentity {
GstElement element;
GstPad *sinkpad;
GstPad *srcpad;
GstByteStream *bs;
gint byte_size;
gint count;
};
struct _GstIdentityClass {
GstElementClass parent_class;
};
GType gst_identity_get_type(void);
GstElementDetails gst_identity_details = {
"ByteStreamTest",
"Filter",
"Test for the GstByteStream code",
VERSION,
"Erik Walthinsen <omega@temple-baptist.com>",
"(C) 2001",
};
/* Identity signals and args */
enum {
/* FILL ME */
LAST_SIGNAL
};
enum {
ARG_0,
ARG_BYTE_SIZE,
ARG_COUNT,
};
static void gst_identity_class_init (GstIdentityClass *klass);
static void gst_identity_init (GstIdentity *identity);
static void gst_identity_set_property (GObject *object, guint prop_id, const GValue *value, GParamSpec *pspec);
static void gst_identity_get_property (GObject *object, guint prop_id, GValue *value, GParamSpec *pspec);
static void gst_identity_loop (GstElement *element);
static GstElementClass *parent_class = NULL;
// static guint gst_identity_signals[LAST_SIGNAL] = { 0 };
GType
gst_identity_get_type (void)
{
static GType identity_type = 0;
if (!identity_type) {
static const GTypeInfo identity_info = {
sizeof(GstIdentityClass), NULL,
NULL,
(GClassInitFunc)gst_identity_class_init,
NULL,
NULL,
sizeof(GstIdentity),
0,
(GInstanceInitFunc)gst_identity_init,
};
identity_type = g_type_register_static (GST_TYPE_ELEMENT, "GstBSTest", &identity_info, 0);
}
return identity_type;
}
static void
gst_identity_class_init (GstIdentityClass *klass)
{
GObjectClass *gobject_class;
gobject_class = (GObjectClass*)klass;
parent_class = g_type_class_ref (GST_TYPE_ELEMENT);
g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_BYTE_SIZE,
g_param_spec_uint ("byte_size", "byte_size", "byte_size",
0, G_MAXUINT, 0, G_PARAM_READWRITE));
g_object_class_install_property (G_OBJECT_CLASS (klass), ARG_COUNT,
g_param_spec_uint ("count", "count", "count",
0, G_MAXUINT, 0, G_PARAM_READWRITE));
gobject_class->set_property = GST_DEBUG_FUNCPTR (gst_identity_set_property);
gobject_class->get_property = GST_DEBUG_FUNCPTR (gst_identity_get_property);
}
static GstPadNegotiateReturn
gst_identity_negotiate_src (GstPad *pad, GstCaps **caps, gpointer *data)
{
GstIdentity *identity;
identity = GST_IDENTITY (gst_pad_get_parent (pad));
return gst_pad_negotiate_proxy (pad, identity->sinkpad, caps);
}
static GstPadNegotiateReturn
gst_identity_negotiate_sink (GstPad *pad, GstCaps **caps, gpointer *data)
{
GstIdentity *identity;
identity = GST_IDENTITY (gst_pad_get_parent (pad));
return gst_pad_negotiate_proxy (pad, identity->srcpad, caps);
}
static void
gst_identity_init (GstIdentity *identity)
{
identity->sinkpad = gst_pad_new ("sink", GST_PAD_SINK);
gst_element_add_pad (GST_ELEMENT (identity), identity->sinkpad);
gst_pad_set_negotiate_function (identity->sinkpad, gst_identity_negotiate_sink);
identity->srcpad = gst_pad_new ("src", GST_PAD_SRC);
gst_element_add_pad (GST_ELEMENT (identity), identity->srcpad);
gst_pad_set_negotiate_function (identity->srcpad, gst_identity_negotiate_src);
gst_element_set_loop_function (GST_ELEMENT (identity), gst_identity_loop);
identity->byte_size = 384;
identity->count = 5;
identity->bs = gst_bytestream_new(identity->sinkpad);
}
static void
gst_identity_loop (GstElement *element)
{
GstIdentity *identity;
GstBuffer *buf;
int i;
g_return_if_fail (element != NULL);
g_return_if_fail (GST_IS_IDENTITY (element));
identity = GST_IDENTITY (element);
/* THIS IS THE BUFFER BASED ONE
do {
// g_print("\n");
for (i=0;i<identity->count;i++) {
// g_print("bstest: getting a buffer of %d bytes\n",identity->byte_size);
buf = gst_bytestream_read(identity->bs,identity->byte_size);
if (!buf) g_print("BUFFER IS BOGUS\n");
// g_print("pushing the buffer, %d bytes at %d\n",GST_BUFFER_SIZE(buf),GST_BUFFER_OFFSET(buf));
gst_pad_push(identity->srcpad,buf);
// g_print("\n");
gst_bytestream_print_status(identity->bs);
// g_print("\n\n");
}
exit(1);
} while (!GST_ELEMENT_IS_COTHREAD_STOPPING(element));
*/
/* THIS IS THE BYTE BASED ONE*/
do {
for (i=0;i<identity->count;i++) {
buf = gst_buffer_new();
// note that this is dangerous, as it does *NOT* refcount the data, it can go away!!!
GST_BUFFER_DATA(buf) = gst_bytestream_peek_bytes(identity->bs,identity->byte_size);
GST_BUFFER_SIZE(buf) = identity->byte_size;
GST_BUFFER_FLAG_SET(buf,GST_BUFFER_DONTFREE);
gst_pad_push(identity->srcpad,buf);
gst_bytestream_flush(identity->bs,identity->byte_size);
}
exit(1);
} while (!GST_ELEMENT_IS_COTHREAD_STOPPING(element));
/**/
}
static void
gst_identity_set_property (GObject *object, guint prop_id, const GValue *value, GParamSpec *pspec)
{
GstIdentity *identity;
/* it's not null if we got it, but it might not be ours */
g_return_if_fail (GST_IS_IDENTITY (object));
identity = GST_IDENTITY (object);
switch (prop_id) {
case ARG_BYTE_SIZE:
identity->byte_size = g_value_get_uint (value);
break;
case ARG_COUNT:
identity->count = g_value_get_uint (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static void gst_identity_get_property(GObject *object, guint prop_id, GValue *value, GParamSpec *pspec) {
GstIdentity *identity;
/* it's not null if we got it, but it might not be ours */
g_return_if_fail (GST_IS_IDENTITY (object));
identity = GST_IDENTITY (object);
switch (prop_id) {
case ARG_BYTE_SIZE:
g_value_set_uint (value, identity->byte_size);
break;
case ARG_COUNT:
g_value_set_uint (value, identity->count);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static gboolean
plugin_init (GModule *module, GstPlugin *plugin)
{
GstElementFactory *factory;
// we need gstbytestream
if (!gst_library_load ("gstbytestream")) {
g_print("can't load bytestream\n");
return FALSE;
}
/* We need to create an ElementFactory for each element we provide.
* This consists of the name of the element, the GType identifier,
* and a pointer to the details structure at the top of the file.
*/
factory = gst_elementfactory_new("gstbstest", GST_TYPE_IDENTITY, &gst_identity_details);
g_return_val_if_fail(factory != NULL, FALSE);
/* The very last thing is to register the elementfactory with the plugin. */
gst_plugin_add_feature (plugin, GST_PLUGIN_FEATURE (factory));
return TRUE;
}
GstPluginDesc plugin_desc = {
GST_VERSION_MAJOR,
GST_VERSION_MINOR,
"gstbstest",
plugin_init
};

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libs/gst/bytestream/bytestream.c Normal file
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/* 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.
*/
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <gst/gstinfo.h>
#include "gstbytestream.h"
//#define BS_DEBUG
#ifdef BS_DEBUG
# define bs_print(format,args...) GST_DEBUG (GST_CAT_BUFFER, format, ## args)
# define bs_status(bs) gst_bytestream_print_status(bs)
#else
# define bs_print(format,args...)
# define bs_status(bs)
#endif
guint8 *gst_bytestream_assemble (GstByteStream * bs, guint32 len);
/**
* 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;
bs->event = NULL;
bs->buflist = NULL;
bs->headbufavail = 0;
bs->listavail = 0;
bs->assembled = NULL;
return bs;
}
void
gst_bytestream_destroy (GstByteStream * bs)
{
GSList *walk;
if (bs->event)
gst_event_free (bs->event);
walk = bs->buflist;
while (walk) {
gst_buffer_unref (GST_BUFFER (walk->data));
walk = g_slist_next (walk);
}
g_slist_free (bs->buflist);
if (bs->assembled)
g_free (bs->assembled);
g_free (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;
GSList *end;
g_assert (!bs->event);
bs_print ("get_next_buf: pulling buffer\n");
nextbuf = gst_pad_pull (bs->pad);
if (GST_IS_EVENT (nextbuf))
{
bs->event = GST_EVENT (nextbuf);
return FALSE;
}
if (!nextbuf)
return FALSE;
bs_print ("get_next_buf: got buffer of %d bytes\n", GST_BUFFER_SIZE (nextbuf));
// first see if there are any buffers in the list at all
if (bs->buflist) {
bs_print ("gst_next_buf: there is at least one buffer in the list\n");
// 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)) {
bs_print ("get_next_buf: merging new buffer with last buf on list\n");
// 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 {
bs_print ("get_next_buf: adding new buffer to the end of the list\n");
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 {
bs_print ("get_next_buf: buflist is empty, adding new buffer to list\n");
// 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);
}
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) {
bs_print ("fill_bytes: there are %d bytes in the list, we need %d\n", bs->listavail, len);
if (!gst_bytestream_get_next_buf (bs))
return FALSE;
}
return TRUE;
}
GstBuffer *
gst_bytestream_peek (GstByteStream * bs, guint32 len)
{
GstBuffer *headbuf, *retbuf = NULL;
g_return_val_if_fail (bs != NULL, NULL);
g_return_val_if_fail (len > 0, NULL);
bs_print ("peek: asking for %d bytes\n", len);
// make sure we have enough
bs_print ("peek: there are %d bytes in the list\n", bs->listavail);
if (len > bs->listavail) {
if (!gst_bytestream_fill_bytes (bs, len))
return NULL;
bs_print ("peek: there are now %d bytes in the list\n", bs->listavail);
}
bs_status (bs);
// extract the head buffer
headbuf = GST_BUFFER (bs->buflist->data);
// if the requested bytes are in the current buffer
bs_print ("peek: headbufavail is %d\n", bs->headbufavail);
if (len <= bs->headbufavail) {
bs_print ("peek: there are enough bytes in headbuf (need %d, have %d)\n", len, bs->headbufavail);
// create a sub-buffer of the headbuf
retbuf = gst_buffer_create_sub (headbuf, GST_BUFFER_SIZE (headbuf) - bs->headbufavail, len);
// otherwise we need to figure out how to assemble one
}
else {
bs_print ("peek: current buffer is not big enough for len %d\n", len);
retbuf = gst_buffer_new ();
GST_BUFFER_SIZE (retbuf) = len;
GST_BUFFER_DATA (retbuf) = gst_bytestream_assemble (bs, len);
if (GST_BUFFER_OFFSET (headbuf) != -1)
GST_BUFFER_OFFSET (retbuf) = GST_BUFFER_OFFSET (headbuf) + (GST_BUFFER_SIZE (headbuf) - bs->headbufavail);
}
return retbuf;
}
guint8 *
gst_bytestream_peek_bytes (GstByteStream * bs, guint32 len)
{
GstBuffer *headbuf;
guint8 *data = NULL;
g_return_val_if_fail (bs != NULL, NULL);
g_return_val_if_fail (len > 0, NULL);
bs_print ("peek_bytes: asking for %d bytes\n", len);
if (bs->assembled) {
g_free (bs->assembled);
bs->assembled = NULL;
}
// make sure we have enough
bs_print ("peek_bytes: there are %d bytes in the list\n", bs->listavail);
if (len > bs->listavail) {
if (!gst_bytestream_fill_bytes (bs, len))
return NULL;
bs_print ("peek_bytes: there are now %d bytes in the list\n", bs->listavail);
}
bs_status (bs);
// extract the head buffer
headbuf = GST_BUFFER (bs->buflist->data);
// if the requested bytes are in the current buffer
bs_print ("peek_bytes: headbufavail is %d\n", bs->headbufavail);
if (len <= bs->headbufavail) {
bs_print ("peek_bytes: there are enough bytes in headbuf (need %d, have %d)\n", 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 {
bs_print ("peek_bytes: current buffer is not big enough for len %d\n", len);
data = gst_bytestream_assemble (bs, len);
bs->assembled = data;
bs->assembled_len = len;
}
return data;
}
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);
bs_print ("assemble: copying %d bytes from curbuf at %d to *data\n", 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)) {
bs_print ("assemble: copying %d bytes from buf to output offset %d\n", GST_BUFFER_SIZE (buf), copied);
memcpy (data + copied, GST_BUFFER_DATA (buf), GST_BUFFER_SIZE (buf));
copied += GST_BUFFER_SIZE (buf);
}
else {
bs_print ("assemble: copying %d bytes from buf to output offset %d\n", len - copied, copied);
memcpy (data + copied, GST_BUFFER_DATA (buf), len - copied);
copied = len;
}
walk = g_slist_next (walk);
}
return data;
}
gboolean
gst_bytestream_flush (GstByteStream * bs, guint32 len)
{
bs_print ("flush: flushing %d bytes\n", len);
// make sure we have enough
bs_print ("flush: there are %d bytes in the list\n", bs->listavail);
if (len > bs->listavail) {
if (!gst_bytestream_fill_bytes (bs, len))
return FALSE;
bs_print ("flush: there are now %d bytes in the list\n", bs->listavail);
}
gst_bytestream_flush_fast (bs, len);
return TRUE;
}
void
gst_bytestream_flush_fast (GstByteStream * bs, guint32 len)
{
GstBuffer *headbuf;
g_assert (len <= bs->listavail);
if (bs->assembled) {
g_free (bs->assembled);
bs->assembled = NULL;
}
// repeat until we've flushed enough data
while (len > 0) {
headbuf = GST_BUFFER (bs->buflist->data);
bs_print ("flush: analyzing buffer that's %d bytes long, offset %d\n", GST_BUFFER_SIZE (headbuf),
GST_BUFFER_OFFSET (headbuf));
// if there's enough to complete the flush
if (bs->headbufavail > len) {
// just trim it off
bs_print ("flush: trimming %d bytes off end of headbuf\n", len);
bs->headbufavail -= len;
bs->listavail -= len;
len = 0;
// otherwise we have to trim the whole buffer
}
else {
bs_print ("flush: removing head buffer completely\n");
// 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));
bs_print ("flush: next headbuf is %d bytes\n", bs->headbufavail);
}
else {
bs_print ("flush: no more bytes at all\n");
}
}
bs_print ("flush: bottom of while(), len is now %d\n", len);
}
}
GstBuffer *
gst_bytestream_read (GstByteStream * bs, guint32 len)
{
GstBuffer *buf = gst_bytestream_peek (bs, len);
if (!buf)
return NULL;
gst_bytestream_flush_fast (bs, len);
return buf;
}
/**
* gst_bytestream_get_status
* @bs: a bytestream
* @avail_out: total number of bytes buffered
* @event_out: an event
*
* When an event occurs, the bytestream will return NULL. You must
* retrieve the event using this API before reading more bytes from
* the stream.
*
* It is possible for the bytestream to return NULL due to running
* out of buffers, however, this indicates a bug because an EOS
* event should have been sent.
*/
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;
}
}
void
gst_bytestream_print_status (GstByteStream * bs)
{
GSList *walk;
GstBuffer *buf;
bs_print ("STATUS: head buffer has %d bytes available\n", bs->headbufavail);
bs_print ("STATUS: list has %d bytes available\n", bs->listavail);
walk = bs->buflist;
while (walk) {
buf = GST_BUFFER (walk->data);
walk = g_slist_next (walk);
bs_print ("STATUS: buffer starts at %d and is %d bytes long\n", GST_BUFFER_OFFSET (buf), GST_BUFFER_SIZE (buf));
}
}

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libs/gst/bytestream/bytestream.h Normal file
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/* 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 <gst/gst.h>
#ifdef __cplusplus
extern "C" {
#endif /* __cplusplus */
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;
};
GstByteStream* gst_bytestream_new (GstPad *pad);
void gst_bytestream_destroy (GstByteStream *bs);
GstBuffer* gst_bytestream_read (GstByteStream *bs, guint32 len);
GstBuffer* gst_bytestream_peek (GstByteStream *bs, guint32 len);
guint8* gst_bytestream_peek_bytes (GstByteStream *bs, 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);
void gst_bytestream_print_status (GstByteStream *bs);
#endif /* __GST_BYTESTREAM_H__ */