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-/*
- * Copyright (C) 2003-2013 The Music Player Daemon Project
- * http://www.musicpd.org
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program 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 General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; if not, write to the Free Software Foundation, Inc.,
- * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
- */
-
-/** \file
- *
- * Internal stuff for the filter core and filter plugins.
- */
-
-#ifndef MPD_FILTER_INTERNAL_HXX
-#define MPD_FILTER_INTERNAL_HXX
-
-#include <stddef.h>
-
-struct AudioFormat;
-class Error;
-
-class Filter {
-public:
- virtual ~Filter() {}
-
- /**
- * Opens the filter, preparing it for FilterPCM().
- *
- * @param filter the filter object
- * @param audio_format the audio format of incoming data; the
- * plugin may modify the object to enforce another input
- * format
- * @param error location to store the error occurring, or nullptr
- * to ignore errors.
- * @return the format of outgoing data or
- * AudioFormat::Undefined() on error
- */
- virtual AudioFormat Open(AudioFormat &af, Error &error) = 0;
-
- /**
- * Closes the filter. After that, you may call Open() again.
- */
- virtual void Close() = 0;
-
- /**
- * Filters a block of PCM data.
- *
- * @param filter the filter object
- * @param src the input buffer
- * @param src_size the size of #src_buffer in bytes
- * @param dest_size_r the size of the returned buffer
- * @param error location to store the error occurring, or nullptr
- * to ignore errors.
- * @return the destination buffer on success (will be
- * invalidated by filter_close() or filter_filter()), nullptr on
- * error
- */
- virtual const void *FilterPCM(const void *src, size_t src_size,
- size_t *dest_size_r,
- Error &error) = 0;
-};
-
-#endif