1 /* -*- c-basic-offset: 2 -*-

     2  * 

     3  * GStreamer

     4  * Copyright (C) 1999-2001 Erik Walthinsen <omega@cse.ogi.edu>

     5  *               2006 Dreamlab Technologies Ltd. <mathis.hofer@dreamlab.net>

     6  *               2009 Sebastian Dröge <sebastian.droege@collabora.co.uk>

     7  *

     8  * This library is free software; you can redistribute it and/or

     9  * modify it under the terms of the GNU Library General Public

    10  * License as published by the Free Software Foundation; either

    11  * version 2 of the License, or (at your option) any later version.

    12  *

    13  * This library is distributed in the hope that it will be useful,

    14  * but WITHOUT ANY WARRANTY; without even the implied warranty of

    15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

    16  * Library General Public License for more details.

    17  *

    18  * You should have received a copy of the GNU Library General Public

    19  * License along with this library; if not, write to the

    20  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,

    21  * Boston, MA 02111-1307, USA.

    22  * 

    23  */

    24 

    25 #ifndef __GST_AUDIO_FX_BASE_FIR_FILTER_H__

    26 #define __GST_AUDIO_FX_BASE_FIR_FILTER_H__

    27 

    28 #include <gst/gst.h>

    29 #include <gst/gst_global.h>

    30 #include <gst/audio/gstaudiofilter.h>

    31 

    32 G_BEGIN_DECLS

    33 

    34 #define GST_TYPE_AUDIO_FX_BASE_FIR_FILTER \

    35   (gst_audio_fx_base_fir_filter_get_type())

    36 #define GST_AUDIO_FX_BASE_FIR_FILTER(obj) \

    37   (G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_AUDIO_FX_BASE_FIR_FILTER,GstAudioFXBaseFIRFilter))

    38 #define GST_AUDIO_FX_BASE_FIR_FILTER_CLASS(klass) \

    39   (G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_AUDIO_FX_BASE_FIR_FILTER,GstAudioFXBaseFIRFilterClass))

    40 #define GST_IS_AUDIO_FX_BASE_FIR_FILTER(obj) \

    41   (G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_AUDIO_FX_BASE_FIR_FILTER))

    42 #define GST_IS_AUDIO_FX_BASE_FIR_FILTER_CLASS(klass) \

    43   (G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_AUDIO_FX_BASE_FIR_FILTER))

    44 

    45 typedef struct _GstAudioFXBaseFIRFilter GstAudioFXBaseFIRFilter;

    46 typedef struct _GstAudioFXBaseFIRFilterClass GstAudioFXBaseFIRFilterClass;

    47 

    48 typedef void (*GstAudioFXBaseFIRFilterProcessFunc) (GstAudioFXBaseFIRFilter *, guint8 *, guint8 *, guint);

    49 

    50 /**

    51  * GstAudioFXBaseFIRFilter:

    52  *

    53  * Opaque data structure.

    54  */

    55 struct _GstAudioFXBaseFIRFilter {

    56   GstAudioFilter element;

    57 

    58   /* < private > */

    59   GstAudioFXBaseFIRFilterProcessFunc process;

    60 

    61   gdouble *kernel;              /* filter kernel */

    62   guint kernel_length;           /* length of the filter kernel */

    63   gdouble *residue;             /* buffer for left-over samples from previous buffer */

    64   guint residue_length;

    65 

    66   guint64 latency;

    67 

    68   GstClockTime next_ts;

    69   guint64 next_off;

    70 };

    71 

    72 struct _GstAudioFXBaseFIRFilterClass {

    73   GstAudioFilterClass parent_class;

    74 };

    75 #ifdef __SYMBIAN32__

    76 IMPORT_C

    77 #endif

    78 

    79 

    80 GType gst_audio_fx_base_fir_filter_get_type (void);

    81 void gst_audio_fx_base_fir_filter_set_kernel (GstAudioFXBaseFIRFilter *filter, gdouble *kernel, guint kernel_length, guint64 latency);

    82 void gst_audio_fx_base_fir_filter_push_residue (GstAudioFXBaseFIRFilter *filter);

    83 

    84 G_END_DECLS

    85 

    86 #endif /* __GST_AUDIO_FX_BASE_FIR_FILTER_H__ */