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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).
336 lines
8.9 KiB
C
336 lines
8.9 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., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, 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 <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 GstElementDetails bz2dec_details = GST_ELEMENT_DETAILS ("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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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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/* 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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GST_BOILERPLATE (GstBz2dec, gst_bz2dec, GstElement, 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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typedef struct
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{
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guint best_probability;
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GstCaps *caps;
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GstBuffer *buffer;
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} SimpleTypeFind;
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guint8 *
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simple_find_peek (gpointer data, gint64 offset, guint size)
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{
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SimpleTypeFind *find = (SimpleTypeFind *) data;
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if (offset < 0)
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return NULL;
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if (GST_BUFFER_SIZE (find->buffer) >= offset + size) {
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return GST_BUFFER_DATA (find->buffer) + offset;
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}
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return NULL;
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}
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static void
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simple_find_suggest (gpointer data, guint probability, const GstCaps * caps)
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{
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SimpleTypeFind *find = (SimpleTypeFind *) data;
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if (probability > find->best_probability) {
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GstCaps *copy = gst_caps_copy (caps);
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gst_caps_replace (&find->caps, copy);
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gst_caps_unref (copy);
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find->best_probability = probability;
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}
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}
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static GstCaps *
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gst_bz2dec_do_typefind (GstBz2dec * b, GstBuffer * buffer)
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{
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GList *walk, *type_list;
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SimpleTypeFind find;
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GstTypeFind gst_find;
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walk = type_list = gst_type_find_factory_get_list ();
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find.buffer = buffer;
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find.best_probability = 0;
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find.caps = NULL;
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gst_find.data = &find;
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gst_find.peek = simple_find_peek;
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gst_find.get_length = NULL;
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gst_find.suggest = simple_find_suggest;
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while (walk) {
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GstTypeFindFactory *factory = GST_TYPE_FIND_FACTORY (walk->data);
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gst_type_find_factory_call_function (factory, &gst_find);
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if (find.best_probability >= GST_TYPE_FIND_MAXIMUM)
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break;
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walk = g_list_next (walk);
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}
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gst_plugin_feature_list_free (type_list);
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if (find.best_probability > 0) {
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GST_DEBUG ("Found caps %s" GST_PTR_FORMAT " with buf size %u", find.caps,
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GST_BUFFER_SIZE (buffer));
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return find.caps;
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}
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return NULL;
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}
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static GstFlowReturn
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gst_bz2dec_chain (GstPad * pad, GstBuffer * in)
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{
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GstBz2dec *b = GST_BZ2DEC (gst_pad_get_parent (pad));
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GstPad *src = gst_element_get_pad (GST_ELEMENT (b), "src");
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int r = BZ_OK;
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gst_object_unref (b);
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gst_object_unref (src);
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if (!b->ready) {
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GST_ELEMENT_ERROR (b, CORE, FAILED, (NULL), ("Decompressor not ready."));
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return GST_FLOW_ERROR;
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}
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b->stream.next_in = (char *) GST_BUFFER_DATA (in);
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b->stream.avail_in = GST_BUFFER_SIZE (in);
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while (r != BZ_STREAM_END) {
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GstBuffer *out;
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GstCaps *caps;
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guint n;
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GstFlowReturn fr;
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/* Create the output buffer */
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if ((fr = gst_pad_alloc_buffer (src, b->offset,
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b->offset ? b->buffer_size : b->first_buffer_size,
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GST_PAD_CAPS (pad), &out)) != GST_FLOW_OK) {
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gst_bz2dec_decompress_init (b);
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return fr;
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}
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/* Decode */
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b->stream.next_out = (char *) GST_BUFFER_DATA (out);
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b->stream.avail_out = GST_BUFFER_SIZE (out);
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r = BZ2_bzDecompress (&b->stream);
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if ((r != BZ_OK) && (r != BZ_STREAM_END)) {
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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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return GST_FLOW_ERROR;
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}
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if (b->stream.avail_out >= GST_BUFFER_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_SIZE (out) -= b->stream.avail_out;
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GST_BUFFER_OFFSET (out) = b->stream.total_out_lo32 - GST_BUFFER_SIZE (out);
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/* Configure source pad (if necessary) */
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if (!b->offset && (caps = gst_bz2dec_do_typefind (b, out))) {
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gst_buffer_set_caps (out, caps);
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gst_pad_set_caps (src, caps);
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gst_caps_unref (caps);
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}
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/* Push data */
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n = GST_BUFFER_SIZE (out);
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if ((fr = gst_pad_push (src, out)) != GST_FLOW_OK) {
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gst_buffer_unref (out);
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return fr;
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}
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b->offset += n;
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}
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gst_buffer_unref (in);
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return GST_FLOW_OK;
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}
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static void
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gst_bz2dec_init (GstBz2dec * b, GstBz2decClass * klass)
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{
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GstPad *pad;
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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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pad =
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gst_pad_new_from_template (gst_static_pad_template_get (&sink_template),
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"sink");
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gst_pad_set_chain_function (pad, gst_bz2dec_chain);
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gst_element_add_pad (GST_ELEMENT (b), pad);
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pad =
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gst_pad_new_from_template (gst_static_pad_template_get (&src_template),
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"src");
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gst_element_add_pad (GST_ELEMENT (b), pad);
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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_base_init (gpointer g_class)
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{
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GstElementClass *ec = GST_ELEMENT_CLASS (g_class);
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gst_element_class_add_pad_template (ec,
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gst_static_pad_template_get (&sink_template));
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gst_element_class_add_pad_template (ec,
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gst_static_pad_template_get (&src_template));
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gst_element_class_set_details (ec, &bz2dec_details);
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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 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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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, G_PARAM_READWRITE));
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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, G_PARAM_READWRITE));
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GST_DEBUG_CATEGORY_INIT (bz2dec_debug, "bz2dec", 0, "BZ2 decompressor");
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}
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