gstreamer/gst/audioconvert/audioconvert.h

/* 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 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;

  /* float audio caps */
  gint buffer_frames;

  gint unit_size;
};

typedef void (*AudioConvertUnpack) (gpointer src, gint32 *dst, gint scale, gint count);
typedef void (*AudioConvertPack) (gint32 *src, gpointer dst, gint scale, 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;

  gboolean in_default;
  gboolean mix_passthrough;
  gboolean out_default;

  gpointer tmpbuf;
  gint tmpbufsize;

  gint in_scale;
  gint out_scale;
};

gboolean	audio_convert_clean_fmt		(AudioConvertFmt *fmt); 

gboolean	audio_convert_prepare_context	(AudioConvertCtx *ctx, AudioConvertFmt *in, 
						 AudioConvertFmt *out);
gboolean 	audio_convert_get_sizes 	(AudioConvertCtx *ctx, gint samples, gint *srcsize,
		                		 gint *dstsize);

gboolean	audio_convert_clean_context	(AudioConvertCtx *ctx);

gboolean	audio_convert_convert		(AudioConvertCtx *ctx, gpointer src, 
						 gpointer dst, gint samples, gboolean src_writable);

#endif /* __AUDIO_CONVERT_H__ */