mirror of https://code.videolan.org/videolan/vlc
133 lines
3.9 KiB
C
133 lines
3.9 KiB
C
/*****************************************************************************
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* stream_filter.c
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*****************************************************************************
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* Copyright (C) 2008 Laurent Aimar
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*
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* Author: Laurent Aimar <fenrir _AT_ videolan _DOT_ org>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation; either version 2.1 of the License, or
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* (at your option) any later version.
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*
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* This program 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
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin Street, Fifth Floor, 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 <vlc_common.h>
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#include <vlc_stream.h>
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#include <vlc_modules.h>
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#include <libvlc.h>
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#include <assert.h>
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#include "stream.h"
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struct vlc_stream_filter_private
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{
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module_t *module;
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};
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static void StreamDelete(stream_t *s)
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{
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struct vlc_stream_filter_private *priv = vlc_stream_Private(s);
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module_unneed(s, priv->module);
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vlc_stream_Delete(s->s);
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free(s->psz_filepath);
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}
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stream_t *vlc_stream_FilterNew( stream_t *p_source,
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const char *psz_stream_filter )
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{
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assert(p_source != NULL);
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/* Stream filters can only filter byte streams. */
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if ((p_source->ops != NULL &&
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p_source->ops->stream.read == NULL && p_source->ops->stream.block == NULL) ||
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(p_source->ops == NULL && p_source->pf_read == NULL && p_source->pf_block == NULL))
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return NULL;
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struct vlc_stream_filter_private *priv;
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stream_t *s = vlc_stream_CustomNew(vlc_object_parent(p_source),
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StreamDelete, sizeof (*priv),
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"stream filter");
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if( s == NULL )
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return NULL;
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priv = vlc_stream_Private(s);
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s->p_input_item = p_source->p_input_item;
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if( p_source->psz_url != NULL )
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{
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s->psz_url = strdup( p_source->psz_url );
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if( unlikely(s->psz_url == NULL) )
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goto error;
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if( p_source->psz_filepath != NULL )
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s->psz_filepath = strdup( p_source->psz_filepath );
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}
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s->s = p_source;
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/* */
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priv->module = module_need(s, "stream_filter", psz_stream_filter, true);
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if (priv->module == NULL)
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goto error;
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return s;
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error:
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free(s->psz_filepath);
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stream_CommonDelete( s );
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return NULL;
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}
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/* Add automatic stream filter */
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stream_t *stream_FilterAutoNew( stream_t *p_source )
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{
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/* Limit number of entries to avoid infinite recursion. */
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for( unsigned i = 0; i < 16; i++ )
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{
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stream_t *p_filter = vlc_stream_FilterNew( p_source, NULL );
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if( p_filter == NULL )
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break;
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msg_Dbg( p_filter, "stream filter added to %p", (void *)p_source );
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p_source = p_filter;
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}
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return p_source;
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}
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/* Add specified stream filter(s) */
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stream_t *stream_FilterChainNew( stream_t *p_source, const char *psz_chain )
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{
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/* Add user stream filter */
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char *chain = strdup( psz_chain );
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if( unlikely(chain == NULL) )
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return p_source;
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char *buf;
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for( const char *name = strtok_r( chain, ":", &buf );
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name != NULL;
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name = strtok_r( NULL, ":", &buf ) )
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{
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stream_t *p_filter = vlc_stream_FilterNew( p_source, name );
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if( p_filter != NULL )
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p_source = p_filter;
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else
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msg_Warn( p_source, "cannot insert stream filter %s", name );
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}
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free( chain );
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return p_source;
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}
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