gstreamer/ext/bz2/gstbz2dec.c
Tim-Philipp Müller 01c7f63200 ext/bz2/: Add proper copyright headers identifying Lutz Müller as the author and copyright holder (#331600).
Original commit message from CVS:
* ext/bz2/gstbz2.c:
* ext/bz2/gstbz2dec.c:
* ext/bz2/gstbz2dec.h:
* ext/bz2/gstbz2enc.c:
* ext/bz2/gstbz2enc.h:
Add proper copyright headers identifying Lutz Müller
as the author and copyright holder (#331600).
2006-02-19 20:00:12 +00:00

336 lines
8.9 KiB
C

/* GStreamer bz2 decoder
* Copyright (C) 2006 Lutz Müller <lutz topfrose de>
* 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 "gstbz2dec.h"
#include <bzlib.h>
#include <string.h>
GST_DEBUG_CATEGORY_STATIC (bz2dec_debug);
#define GST_CAT_DEFAULT bz2dec_debug
static GstElementDetails bz2dec_details = GST_ELEMENT_DETAILS ("BZ2 decoder",
"Codec/Decoder", "Decodes compressed streams",
"Lutz Mueller <lutz@users.sourceforge.net>");
static GstStaticPadTemplate sink_template =
GST_STATIC_PAD_TEMPLATE ("sink", GST_PAD_SINK, GST_PAD_ALWAYS,
GST_STATIC_CAPS ("application/x-bzip"));
static GstStaticPadTemplate src_template =
GST_STATIC_PAD_TEMPLATE ("src", GST_PAD_SRC, GST_PAD_ALWAYS,
GST_STATIC_CAPS ("ANY"));
struct _GstBz2dec
{
GstElement parent;
/* Properties */
guint first_buffer_size;
guint buffer_size;
gboolean ready;
bz_stream stream;
guint64 offset;
};
struct _GstBz2decClass
{
GstElementClass parent_class;
};
GST_BOILERPLATE (GstBz2dec, gst_bz2dec, GstElement, GST_TYPE_ELEMENT);
#define DEFAULT_FIRST_BUFFER_SIZE 1024
#define DEFAULT_BUFFER_SIZE 1024
enum
{
PROP_0,
PROP_FIRST_BUFFER_SIZE,
PROP_BUFFER_SIZE
};
static void
gst_bz2dec_decompress_end (GstBz2dec * b)
{
g_return_if_fail (GST_IS_BZ2DEC (b));
if (b->ready) {
BZ2_bzDecompressEnd (&b->stream);
memset (&b->stream, 0, sizeof (b->stream));
b->ready = FALSE;
}
}
static void
gst_bz2dec_decompress_init (GstBz2dec * b)
{
g_return_if_fail (GST_IS_BZ2DEC (b));
gst_bz2dec_decompress_end (b);
b->offset = 0;
switch (BZ2_bzDecompressInit (&b->stream, 0, 0)) {
case BZ_OK:
b->ready = TRUE;
return;
default:
b->ready = FALSE;
GST_ELEMENT_ERROR (b, CORE, FAILED, (NULL),
("Failed to start decompression."));
return;
}
}
typedef struct
{
guint best_probability;
GstCaps *caps;
GstBuffer *buffer;
} SimpleTypeFind;
guint8 *
simple_find_peek (gpointer data, gint64 offset, guint size)
{
SimpleTypeFind *find = (SimpleTypeFind *) data;
if (offset < 0)
return NULL;
if (GST_BUFFER_SIZE (find->buffer) >= offset + size) {
return GST_BUFFER_DATA (find->buffer) + offset;
}
return NULL;
}
static void
simple_find_suggest (gpointer data, guint probability, const GstCaps * caps)
{
SimpleTypeFind *find = (SimpleTypeFind *) data;
if (probability > find->best_probability) {
GstCaps *copy = gst_caps_copy (caps);
gst_caps_replace (&find->caps, copy);
gst_caps_unref (copy);
find->best_probability = probability;
}
}
static GstCaps *
gst_bz2dec_do_typefind (GstBz2dec * b, GstBuffer * buffer)
{
GList *walk, *type_list;
SimpleTypeFind find;
GstTypeFind gst_find;
walk = type_list = gst_type_find_factory_get_list ();
find.buffer = buffer;
find.best_probability = 0;
find.caps = NULL;
gst_find.data = &find;
gst_find.peek = simple_find_peek;
gst_find.get_length = NULL;
gst_find.suggest = simple_find_suggest;
while (walk) {
GstTypeFindFactory *factory = GST_TYPE_FIND_FACTORY (walk->data);
gst_type_find_factory_call_function (factory, &gst_find);
if (find.best_probability >= GST_TYPE_FIND_MAXIMUM)
break;
walk = g_list_next (walk);
}
gst_plugin_feature_list_free (type_list);
if (find.best_probability > 0) {
GST_DEBUG ("Found caps %s" GST_PTR_FORMAT " with buf size %u", find.caps,
GST_BUFFER_SIZE (buffer));
return find.caps;
}
return NULL;
}
static GstFlowReturn
gst_bz2dec_chain (GstPad * pad, GstBuffer * in)
{
GstBz2dec *b = GST_BZ2DEC (gst_pad_get_parent (pad));
GstPad *src = gst_element_get_pad (GST_ELEMENT (b), "src");
int r = BZ_OK;
gst_object_unref (b);
gst_object_unref (src);
if (!b->ready) {
GST_ELEMENT_ERROR (b, CORE, FAILED, (NULL), ("Decompressor not ready."));
return GST_FLOW_ERROR;
}
b->stream.next_in = (char *) GST_BUFFER_DATA (in);
b->stream.avail_in = GST_BUFFER_SIZE (in);
while (r != BZ_STREAM_END) {
GstBuffer *out;
GstCaps *caps;
guint n;
GstFlowReturn fr;
/* Create the output buffer */
if ((fr = gst_pad_alloc_buffer (src, b->offset,
b->offset ? b->buffer_size : b->first_buffer_size,
GST_PAD_CAPS (pad), &out)) != GST_FLOW_OK) {
gst_bz2dec_decompress_init (b);
return fr;
}
/* Decode */
b->stream.next_out = (char *) GST_BUFFER_DATA (out);
b->stream.avail_out = GST_BUFFER_SIZE (out);
r = BZ2_bzDecompress (&b->stream);
if ((r != BZ_OK) && (r != BZ_STREAM_END)) {
GST_ELEMENT_ERROR (b, STREAM, DECODE, (NULL),
("Failed to decompress data (error code %i).", r));
gst_bz2dec_decompress_init (b);
gst_buffer_unref (out);
return GST_FLOW_ERROR;
}
if (b->stream.avail_out >= GST_BUFFER_SIZE (out)) {
gst_buffer_unref (out);
break;
}
GST_BUFFER_SIZE (out) -= b->stream.avail_out;
GST_BUFFER_OFFSET (out) = b->stream.total_out_lo32 - GST_BUFFER_SIZE (out);
/* Configure source pad (if necessary) */
if (!b->offset && (caps = gst_bz2dec_do_typefind (b, out))) {
gst_buffer_set_caps (out, caps);
gst_pad_set_caps (src, caps);
gst_caps_unref (caps);
}
/* Push data */
n = GST_BUFFER_SIZE (out);
if ((fr = gst_pad_push (src, out)) != GST_FLOW_OK) {
gst_buffer_unref (out);
return fr;
}
b->offset += n;
}
gst_buffer_unref (in);
return GST_FLOW_OK;
}
static void
gst_bz2dec_init (GstBz2dec * b, GstBz2decClass * klass)
{
GstPad *pad;
b->first_buffer_size = DEFAULT_FIRST_BUFFER_SIZE;
b->buffer_size = DEFAULT_BUFFER_SIZE;
pad =
gst_pad_new_from_template (gst_static_pad_template_get (&sink_template),
"sink");
gst_pad_set_chain_function (pad, gst_bz2dec_chain);
gst_element_add_pad (GST_ELEMENT (b), pad);
pad =
gst_pad_new_from_template (gst_static_pad_template_get (&src_template),
"src");
gst_element_add_pad (GST_ELEMENT (b), pad);
gst_bz2dec_decompress_init (b);
}
static void
gst_bz2dec_base_init (gpointer g_class)
{
GstElementClass *ec = GST_ELEMENT_CLASS (g_class);
gst_element_class_add_pad_template (ec,
gst_static_pad_template_get (&sink_template));
gst_element_class_add_pad_template (ec,
gst_static_pad_template_get (&src_template));
gst_element_class_set_details (ec, &bz2dec_details);
}
static void
gst_bz2dec_finalize (GObject * object)
{
GstBz2dec *b = GST_BZ2DEC (object);
gst_bz2dec_decompress_end (b);
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static void
gst_bz2dec_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec)
{
GstBz2dec *b = GST_BZ2DEC (object);
switch (prop_id) {
case PROP_BUFFER_SIZE:
g_value_set_uint (value, b->buffer_size);
break;
case PROP_FIRST_BUFFER_SIZE:
g_value_set_uint (value, b->first_buffer_size);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
}
}
static void
gst_bz2dec_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
GstBz2dec *b = GST_BZ2DEC (object);
switch (prop_id) {
case PROP_BUFFER_SIZE:
b->buffer_size = g_value_get_uint (value);
break;
case PROP_FIRST_BUFFER_SIZE:
b->first_buffer_size = g_value_get_uint (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
}
}
static void
gst_bz2dec_class_init (GstBz2decClass * klass)
{
GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
gobject_class->finalize = gst_bz2dec_finalize;
gobject_class->get_property = gst_bz2dec_get_property;
gobject_class->set_property = gst_bz2dec_set_property;
g_object_class_install_property (G_OBJECT_CLASS (klass),
PROP_FIRST_BUFFER_SIZE, g_param_spec_uint ("first_buffer_size",
"Size of first buffer", "Size of first buffer (used to determine the "
"mime type of the uncompressed data)", 1, G_MAXUINT,
DEFAULT_FIRST_BUFFER_SIZE, G_PARAM_READWRITE));
g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_BUFFER_SIZE,
g_param_spec_uint ("buffer_size", "Buffer size", "Buffer size",
1, G_MAXUINT, DEFAULT_BUFFER_SIZE, G_PARAM_READWRITE));
GST_DEBUG_CATEGORY_INIT (bz2dec_debug, "bz2dec", 0, "BZ2 decompressor");
}