gstreamer/ext/bz2/gstbz2enc.c

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/* GStreamer bz2 encoder
* 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 "gstbz2enc.h"
#include <bzlib.h>
#include <string.h>
GST_DEBUG_CATEGORY_STATIC (bz2enc_debug);
#define GST_CAT_DEFAULT bz2enc_debug
static GstStaticPadTemplate sink_template =
GST_STATIC_PAD_TEMPLATE ("sink", GST_PAD_SINK, GST_PAD_ALWAYS,
GST_STATIC_CAPS ("ANY"));
static GstStaticPadTemplate src_template =
GST_STATIC_PAD_TEMPLATE ("src", GST_PAD_SRC, GST_PAD_ALWAYS,
GST_STATIC_CAPS ("application/x-bzip"));
#define DEFAULT_BLOCK_SIZE 6
#define DEFAULT_BUFFER_SIZE 1024
enum
{
PROP_0,
PROP_BLOCK_SIZE,
PROP_BUFFER_SIZE
};
struct _GstBz2enc
{
GstElement parent;
GstPad *sink;
GstPad *src;
/* Properties */
guint block_size;
guint buffer_size;
gboolean ready;
bz_stream stream;
guint64 offset;
};
struct _GstBz2encClass
{
GstElementClass parent_class;
};
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#define gst_bz2enc_parent_class parent_class
G_DEFINE_TYPE (GstBz2enc, gst_bz2enc, GST_TYPE_ELEMENT);
static void
gst_bz2enc_compress_end (GstBz2enc * b)
{
g_return_if_fail (GST_IS_BZ2ENC (b));
if (b->ready) {
BZ2_bzCompressEnd (&b->stream);
memset (&b->stream, 0, sizeof (b->stream));
b->ready = FALSE;
}
}
static void
gst_bz2enc_compress_init (GstBz2enc * b)
{
g_return_if_fail (GST_IS_BZ2ENC (b));
gst_bz2enc_compress_end (b);
b->offset = 0;
switch (BZ2_bzCompressInit (&b->stream, b->block_size, 0, 0)) {
case BZ_OK:
b->ready = TRUE;
return;
default:
b->ready = FALSE;
GST_ELEMENT_ERROR (b, CORE, FAILED, (NULL),
("Failed to start compression."));
return;
}
}
static gboolean
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gst_bz2enc_event (GstPad * pad, GstObject * parent, GstEvent * e)
{
GstBz2enc *b;
gboolean ret;
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b = GST_BZ2ENC (parent);
switch (GST_EVENT_TYPE (e)) {
case GST_EVENT_EOS:{
GstFlowReturn flow;
int r = BZ_FINISH_OK;
do {
GstBuffer *out;
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GstMapInfo omap;
guint n;
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out = gst_buffer_new_and_alloc (b->buffer_size);
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gst_buffer_map (out, &omap, GST_MAP_WRITE);
b->stream.next_out = (char *) omap.data;
b->stream.avail_out = omap.size;
r = BZ2_bzCompress (&b->stream, BZ_FINISH);
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gst_buffer_unmap (out, &omap);
if ((r != BZ_FINISH_OK) && (r != BZ_STREAM_END)) {
GST_ELEMENT_ERROR (b, STREAM, ENCODE, (NULL),
("Failed to finish to compress (error code %i).", r));
gst_buffer_unref (out);
break;
}
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n = gst_buffer_get_size (out);
if (b->stream.avail_out >= n) {
gst_buffer_unref (out);
break;
}
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gst_buffer_resize (out, 0, n - b->stream.avail_out);
n = gst_buffer_get_size (out);
GST_BUFFER_OFFSET (out) = b->stream.total_out_lo32 - n;
flow = gst_pad_push (b->src, out);
if (flow != GST_FLOW_OK) {
GST_DEBUG_OBJECT (b, "push on EOS failed: %s",
gst_flow_get_name (flow));
break;
}
} while (r != BZ_STREAM_END);
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ret = gst_pad_event_default (pad, parent, e);
if (r != BZ_STREAM_END || flow != GST_FLOW_OK)
ret = FALSE;
gst_bz2enc_compress_init (b);
break;
}
default:
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ret = gst_pad_event_default (pad, parent, e);
break;
}
return ret;
}
static GstFlowReturn
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gst_bz2enc_chain (GstPad * pad, GstObject * parent, GstBuffer * in)
{
GstFlowReturn flow = GST_FLOW_OK;
GstBuffer *out;
GstBz2enc *b;
guint n;
int bz2_ret;
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GstMapInfo map, omap;
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b = GST_BZ2ENC (parent);
if (!b->ready)
goto not_ready;
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gst_buffer_map (in, &map, GST_MAP_READ);
b->stream.next_in = (char *) map.data;
b->stream.avail_in = map.size;
while (b->stream.avail_in) {
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out = gst_buffer_new_and_alloc (b->buffer_size);
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gst_buffer_map (out, &omap, GST_MAP_WRITE);
b->stream.next_out = (char *) omap.data;
b->stream.avail_out = omap.size;
bz2_ret = BZ2_bzCompress (&b->stream, BZ_RUN);
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gst_buffer_unmap (out, &omap);
if (bz2_ret != BZ_RUN_OK)
goto compress_error;
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n = gst_buffer_get_size (out);
if (b->stream.avail_out >= n) {
gst_buffer_unref (out);
break;
}
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gst_buffer_resize (out, 0, n - b->stream.avail_out);
n = gst_buffer_get_size (out);
GST_BUFFER_OFFSET (out) = b->stream.total_out_lo32 - n;
flow = gst_pad_push (b->src, out);
if (flow != GST_FLOW_OK)
break;
b->offset += n;
}
done:
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gst_buffer_unmap (in, &map);
gst_buffer_unref (in);
return flow;
/* ERRORS */
not_ready:
{
GST_ELEMENT_ERROR (b, LIBRARY, FAILED, (NULL), ("Compressor not ready."));
flow = GST_FLOW_FLUSHING;
goto done;
}
compress_error:
{
GST_ELEMENT_ERROR (b, STREAM, ENCODE, (NULL),
("Failed to compress data (error code %i)", bz2_ret));
gst_bz2enc_compress_init (b);
gst_buffer_unref (out);
flow = GST_FLOW_ERROR;
goto done;
}
}
static void
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gst_bz2enc_init (GstBz2enc * b)
{
b->sink = gst_pad_new_from_static_template (&sink_template, "sink");
gst_pad_set_chain_function (b->sink, GST_DEBUG_FUNCPTR (gst_bz2enc_chain));
gst_pad_set_event_function (b->sink, GST_DEBUG_FUNCPTR (gst_bz2enc_event));
gst_element_add_pad (GST_ELEMENT (b), b->sink);
b->src = gst_pad_new_from_static_template (&src_template, "src");
gst_pad_set_caps (b->src, gst_static_pad_template_get_caps (&src_template));
gst_pad_use_fixed_caps (b->src);
gst_element_add_pad (GST_ELEMENT (b), b->src);
b->block_size = DEFAULT_BLOCK_SIZE;
b->buffer_size = DEFAULT_BUFFER_SIZE;
gst_bz2enc_compress_init (b);
}
static void
gst_bz2enc_finalize (GObject * object)
{
GstBz2enc *b = GST_BZ2ENC (object);
gst_bz2enc_compress_end (b);
G_OBJECT_CLASS (parent_class)->finalize (object);
}
static void
gst_bz2enc_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec)
{
GstBz2enc *b = GST_BZ2ENC (object);
switch (prop_id) {
case PROP_BLOCK_SIZE:
g_value_set_uint (value, b->block_size);
break;
case PROP_BUFFER_SIZE:
g_value_set_uint (value, b->buffer_size);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
}
}
static void
gst_bz2enc_set_property (GObject * object, guint prop_id,
const GValue * value, GParamSpec * pspec)
{
GstBz2enc *b = GST_BZ2ENC (object);
switch (prop_id) {
case PROP_BLOCK_SIZE:
b->block_size = g_value_get_uint (value);
gst_bz2enc_compress_init (b);
break;
case PROP_BUFFER_SIZE:
b->buffer_size = g_value_get_uint (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
}
}
static void
gst_bz2enc_class_init (GstBz2encClass * klass)
{
GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
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GstElementClass *gstelement_class = GST_ELEMENT_CLASS (klass);
gobject_class->finalize = gst_bz2enc_finalize;
gobject_class->set_property = gst_bz2enc_set_property;
gobject_class->get_property = gst_bz2enc_get_property;
g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_BLOCK_SIZE,
g_param_spec_uint ("block-size", "Block size", "Block size",
1, 9, DEFAULT_BLOCK_SIZE,
G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
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 | G_PARAM_STATIC_STRINGS));
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gst_element_class_add_pad_template (gstelement_class,
gst_static_pad_template_get (&sink_template));
gst_element_class_add_pad_template (gstelement_class,
gst_static_pad_template_get (&src_template));
gst_element_class_set_details_simple (gstelement_class, "BZ2 encoder",
"Codec/Encoder", "Compresses streams",
"Lutz Mueller <lutz@users.sourceforge.net>");
GST_DEBUG_CATEGORY_INIT (bz2enc_debug, "bz2enc", 0, "BZ2 compressor");
}