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-rw-r--r--ext/bz2/gstbz2dec.c239
1 files changed, 239 insertions, 0 deletions
diff --git a/ext/bz2/gstbz2dec.c b/ext/bz2/gstbz2dec.c
new file mode 100644
index 00000000..561cc408
--- /dev/null
+++ b/ext/bz2/gstbz2dec.c
@@ -0,0 +1,239 @@
+/* GStreamer
+ *
+ * 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-bz2"));
+static GstStaticPadTemplate src_template =
+GST_STATIC_PAD_TEMPLATE ("src", GST_PAD_SRC, GST_PAD_ALWAYS,
+ GST_STATIC_CAPS ("application/octet-stream"));
+
+struct _GstBz2dec
+{
+ GstElement parent;
+
+ /* Properties */
+ 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_BUFFER_SIZE 1024
+
+enum
+{
+ PROP_0,
+ 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;
+ }
+}
+
+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;
+ GstFlowReturn fr;
+ guint n;
+
+ 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;
+
+ if ((fr = gst_pad_alloc_buffer (src, b->offset, b->buffer_size,
+ GST_PAD_CAPS (pad), &out)) != GST_FLOW_OK) {
+ gst_bz2dec_decompress_init (b);
+ return fr;
+ }
+ 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);
+ 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->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;
+ 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;
+ 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);
+
+ parent_class = g_type_class_ref (GST_TYPE_ELEMENT);
+
+ 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_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");
+}
generated by cgit v1.2.1 (git 2.18.0) at 2024-07-03 08:31:58 +0000