/* GStreamer

 * Copyright (C) 2004 Ronald Bultje <rbultje@ronald.bitfreak.net>

 *

 * audioconvert.h: audio format conversion library

 *

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

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

 * License as published by the Free Software Foundation; either

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

 *

 * This library 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

 * Library General Public License for more details.

 *

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

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

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

 * Boston, MA 02111-1307, USA.

 */

#ifndef __AUDIO_CONVERT_H__

#define __AUDIO_CONVERT_H__

#include <gst/gst.h>

#include <gst/audio/multichannel.h>

typedef enum

{

  DITHER_NONE = 0,

  DITHER_RPDF,

  DITHER_TPDF,

  DITHER_TPDF_HF

typedef enum

{

  NOISE_SHAPING_NONE = 0,

  NOISE_SHAPING_ERROR_FEEDBACK,

  NOISE_SHAPING_SIMPLE,

  NOISE_SHAPING_MEDIUM,

  NOISE_SHAPING_HIGH

typedef struct _AudioConvertCtx AudioConvertCtx;

typedef struct _AudioConvertFmt AudioConvertFmt;

struct _AudioConvertFmt

{

  /* general caps */

  gboolean is_int;

  gint endianness;

  gint width;

  gint rate;

  gint channels;

  GstAudioChannelPosition *pos;

  /* int audio caps */

  gboolean sign;

  gint depth;

  gint unit_size;

};

typedef void (*AudioConvertUnpack) (gpointer src, gpointer dst, gint scale,

    gint count);

typedef void (*AudioConvertPack) (gpointer src, gpointer dst, gint scale,

    gint count);

typedef void (*AudioConvertMix) (AudioConvertCtx *, gpointer, gpointer, gint);

typedef void (*AudioConvertQuantize) (AudioConvertCtx * ctx, gpointer src,

    gpointer dst, gint count);

struct _AudioConvertCtx

{

  AudioConvertFmt in;

  AudioConvertFmt out;

  AudioConvertUnpack unpack;

  AudioConvertPack pack;

  /* channel conversion matrix, m[in_channels][out_channels].

   * If identity matrix, passthrough applies. */

  gfloat **matrix;

  /* temp storage for channelmix */

  gpointer tmp;

  gboolean in_default;

  gboolean mix_passthrough;

  gboolean out_default;

  gpointer tmpbuf;

  gint tmpbufsize;

  gint in_scale;

  gint out_scale;

  AudioConvertMix channel_mix;

  AudioConvertQuantize quantize;

  /* last random number generated per channel for hifreq TPDF dither */

  gpointer last_random;

  /* contains the past quantization errors, error[out_channels][count] */

  gdouble *error_buf;

};

#ifdef __SYMBIAN32__

IMPORT_C

#endif

gboolean audio_convert_clean_fmt (AudioConvertFmt * fmt);

#ifdef __SYMBIAN32__

IMPORT_C

#endif

gboolean audio_convert_prepare_context (AudioConvertCtx * ctx,

#ifdef __SYMBIAN32__

IMPORT_C

#endif

gboolean audio_convert_get_sizes (AudioConvertCtx * ctx, gint samples,

    gint * srcsize, gint * dstsize);

#ifdef __SYMBIAN32__

IMPORT_C

#endif

gboolean audio_convert_clean_context (AudioConvertCtx * ctx);

#ifdef __SYMBIAN32__

IMPORT_C

#endif

gboolean audio_convert_convert (AudioConvertCtx * ctx, gpointer src,

    gpointer dst, gint samples, gboolean src_writable);

#endif /* __AUDIO_CONVERT_H__ */