gstreamer/gst/audioconvert/audioconvert.h

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/* 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;
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);
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;
};
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__ */