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306 lines
8.1 KiB
C
306 lines
8.1 KiB
C
/* GStreamer bz2 decoder
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* Copyright (C) 2006 Lutz Müller <lutz topfrose de>
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include "gstbz2dec.h"
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#include <gst/base/gsttypefindhelper.h>
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#include <bzlib.h>
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#include <string.h>
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GST_DEBUG_CATEGORY_STATIC (bz2dec_debug);
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#define GST_CAT_DEFAULT bz2dec_debug
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static GstStaticPadTemplate sink_template =
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GST_STATIC_PAD_TEMPLATE ("sink", GST_PAD_SINK, GST_PAD_ALWAYS,
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GST_STATIC_CAPS ("application/x-bzip"));
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static GstStaticPadTemplate src_template =
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GST_STATIC_PAD_TEMPLATE ("src", GST_PAD_SRC, GST_PAD_ALWAYS,
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GST_STATIC_CAPS_ANY);
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struct _GstBz2dec
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{
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GstElement parent;
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GstPad *sink;
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GstPad *src;
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/* Properties */
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guint first_buffer_size;
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guint buffer_size;
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gboolean ready;
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bz_stream stream;
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guint64 offset;
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};
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struct _GstBz2decClass
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{
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GstElementClass parent_class;
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};
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#define gst_bz2dec_parent_class parent_class
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G_DEFINE_TYPE (GstBz2dec, gst_bz2dec, GST_TYPE_ELEMENT);
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#define DEFAULT_FIRST_BUFFER_SIZE 1024
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#define DEFAULT_BUFFER_SIZE 1024
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enum
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{
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PROP_0,
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PROP_FIRST_BUFFER_SIZE,
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PROP_BUFFER_SIZE
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};
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static void
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gst_bz2dec_decompress_end (GstBz2dec * b)
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{
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g_return_if_fail (GST_IS_BZ2DEC (b));
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if (b->ready) {
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BZ2_bzDecompressEnd (&b->stream);
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memset (&b->stream, 0, sizeof (b->stream));
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b->ready = FALSE;
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}
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}
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static void
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gst_bz2dec_decompress_init (GstBz2dec * b)
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{
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g_return_if_fail (GST_IS_BZ2DEC (b));
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gst_bz2dec_decompress_end (b);
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b->offset = 0;
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switch (BZ2_bzDecompressInit (&b->stream, 0, 0)) {
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case BZ_OK:
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b->ready = TRUE;
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return;
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default:
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b->ready = FALSE;
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GST_ELEMENT_ERROR (b, CORE, FAILED, (NULL),
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("Failed to start decompression."));
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return;
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}
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}
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static GstFlowReturn
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gst_bz2dec_chain (GstPad * pad, GstObject * parent, GstBuffer * in)
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{
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GstFlowReturn flow = GST_FLOW_OK;
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GstBuffer *out;
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GstBz2dec *b;
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int r = BZ_OK;
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GstMapInfo map = GST_MAP_INFO_INIT, omap;
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b = GST_BZ2DEC (parent);
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if (!b->ready)
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goto not_ready;
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gst_buffer_map (in, &map, GST_MAP_READ);
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b->stream.next_in = (char *) map.data;
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b->stream.avail_in = map.size;
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do {
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guint n;
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/* Create the output buffer */
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out =
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gst_buffer_new_and_alloc (b->offset ? b->buffer_size : b->
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first_buffer_size);
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/* Decode */
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gst_buffer_map (out, &omap, GST_MAP_WRITE);
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b->stream.next_out = (char *) omap.data;
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b->stream.avail_out = omap.size;
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r = BZ2_bzDecompress (&b->stream);
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gst_buffer_unmap (out, &omap);
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if ((r != BZ_OK) && (r != BZ_STREAM_END))
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goto decode_failed;
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if (b->stream.avail_out >= gst_buffer_get_size (out)) {
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gst_buffer_unref (out);
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break;
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}
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gst_buffer_resize (out, 0, gst_buffer_get_size (out) - b->stream.avail_out);
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GST_BUFFER_OFFSET (out) =
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b->stream.total_out_lo32 - gst_buffer_get_size (out);
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/* Configure source pad (if necessary) */
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if (!b->offset) {
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GstCaps *caps = NULL;
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caps = gst_type_find_helper_for_buffer (GST_OBJECT (b), out, NULL);
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if (caps) {
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gst_pad_set_caps (b->src, caps);
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gst_pad_use_fixed_caps (b->src);
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gst_caps_unref (caps);
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} else {
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/* FIXME: shouldn't we queue output buffers until we have a type? */
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}
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}
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/* Push data */
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n = gst_buffer_get_size (out);
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flow = gst_pad_push (b->src, out);
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if (flow != GST_FLOW_OK)
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break;
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b->offset += n;
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} while (r != BZ_STREAM_END);
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done:
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gst_buffer_unmap (in, &map);
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gst_buffer_unref (in);
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return flow;
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/* ERRORS */
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decode_failed:
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{
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GST_ELEMENT_ERROR (b, STREAM, DECODE, (NULL),
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("Failed to decompress data (error code %i).", r));
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gst_bz2dec_decompress_init (b);
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gst_buffer_unref (out);
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flow = GST_FLOW_ERROR;
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goto done;
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}
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not_ready:
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{
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GST_ELEMENT_ERROR (b, LIBRARY, FAILED, (NULL), ("Decompressor not ready."));
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flow = GST_FLOW_FLUSHING;
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goto done;
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}
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}
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static void
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gst_bz2dec_init (GstBz2dec * b)
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{
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b->first_buffer_size = DEFAULT_FIRST_BUFFER_SIZE;
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b->buffer_size = DEFAULT_BUFFER_SIZE;
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b->sink = gst_pad_new_from_static_template (&sink_template, "sink");
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gst_pad_set_chain_function (b->sink, GST_DEBUG_FUNCPTR (gst_bz2dec_chain));
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gst_element_add_pad (GST_ELEMENT (b), b->sink);
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b->src = gst_pad_new_from_static_template (&src_template, "src");
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gst_element_add_pad (GST_ELEMENT (b), b->src);
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gst_pad_use_fixed_caps (b->src);
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gst_bz2dec_decompress_init (b);
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}
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static void
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gst_bz2dec_finalize (GObject * object)
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{
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GstBz2dec *b = GST_BZ2DEC (object);
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gst_bz2dec_decompress_end (b);
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G_OBJECT_CLASS (parent_class)->finalize (object);
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}
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static void
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gst_bz2dec_get_property (GObject * object, guint prop_id,
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GValue * value, GParamSpec * pspec)
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{
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GstBz2dec *b = GST_BZ2DEC (object);
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switch (prop_id) {
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case PROP_BUFFER_SIZE:
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g_value_set_uint (value, b->buffer_size);
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break;
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case PROP_FIRST_BUFFER_SIZE:
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g_value_set_uint (value, b->first_buffer_size);
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
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}
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}
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static void
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gst_bz2dec_set_property (GObject * object, guint prop_id,
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const GValue * value, GParamSpec * pspec)
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{
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GstBz2dec *b = GST_BZ2DEC (object);
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switch (prop_id) {
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case PROP_BUFFER_SIZE:
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b->buffer_size = g_value_get_uint (value);
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break;
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case PROP_FIRST_BUFFER_SIZE:
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b->first_buffer_size = g_value_get_uint (value);
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
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}
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}
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static GstStateChangeReturn
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gst_bz2dec_change_state (GstElement * element, GstStateChange transition)
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{
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GstBz2dec *b = GST_BZ2DEC (element);
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GstStateChangeReturn ret;
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ret = GST_ELEMENT_CLASS (parent_class)->change_state (element, transition);
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if (ret != GST_STATE_CHANGE_SUCCESS)
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return ret;
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switch (transition) {
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case GST_STATE_CHANGE_PAUSED_TO_READY:
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gst_bz2dec_decompress_init (b);
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break;
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default:
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break;
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}
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return ret;
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}
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static void
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gst_bz2dec_class_init (GstBz2decClass * klass)
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{
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GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
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GstElementClass *gstelement_class = GST_ELEMENT_CLASS (klass);
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gstelement_class->change_state = GST_DEBUG_FUNCPTR (gst_bz2dec_change_state);
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gobject_class->finalize = gst_bz2dec_finalize;
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gobject_class->get_property = gst_bz2dec_get_property;
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gobject_class->set_property = gst_bz2dec_set_property;
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g_object_class_install_property (G_OBJECT_CLASS (klass),
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PROP_FIRST_BUFFER_SIZE, g_param_spec_uint ("first-buffer-size",
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"Size of first buffer", "Size of first buffer (used to determine the "
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"mime type of the uncompressed data)", 1, G_MAXUINT,
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DEFAULT_FIRST_BUFFER_SIZE,
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G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
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g_object_class_install_property (G_OBJECT_CLASS (klass), PROP_BUFFER_SIZE,
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g_param_spec_uint ("buffer-size", "Buffer size", "Buffer size",
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1, G_MAXUINT, DEFAULT_BUFFER_SIZE,
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G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS));
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gst_element_class_add_static_pad_template (gstelement_class, &sink_template);
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gst_element_class_add_static_pad_template (gstelement_class, &src_template);
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gst_element_class_set_static_metadata (gstelement_class, "BZ2 decoder",
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"Codec/Decoder", "Decodes compressed streams",
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"Lutz Mueller <lutz@users.sourceforge.net>");
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GST_DEBUG_CATEGORY_INIT (bz2dec_debug, "bz2dec", 0, "BZ2 decompressor");
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}
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