path: root/libavcodec/aacenc_is.h (plain)
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1	/*
2	* AAC encoder intensity stereo
3	* Copyright (C) 2015 Rostislav Pehlivanov
4	*
5	* This file is part of FFmpeg.
6	*
7	* FFmpeg is free software; you can redistribute it and/or
8	* modify it under the terms of the GNU Lesser General Public
9	* License as published by the Free Software Foundation; either
10	* version 2.1 of the License, or (at your option) any later version.
11	*
12	* FFmpeg is distributed in the hope that it will be useful,
13	* but WITHOUT ANY WARRANTY; without even the implied warranty of
14	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15	* Lesser General Public License for more details.
16	*
17	* You should have received a copy of the GNU Lesser General Public
18	* License along with FFmpeg; if not, write to the Free Software
19	* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20	*/
21
22	/**
23	* @file
24	* AAC encoder Intensity Stereo
25	* @author Rostislav Pehlivanov ( atomnuker gmail com )
26	*/
27
28	#ifndef AVCODEC_AACENC_IS_H
29	#define AVCODEC_AACENC_IS_H
30
31	#include "aacenc.h"
32
33	/** Frequency in Hz for lower limit of intensity stereo **/
34	#define INT_STEREO_LOW_LIMIT 6100
35
36	struct AACISError {
37	int pass; /* 1 if dist2 <= dist1 */
38	int phase; /* -1 or +1 */
39	float error; /* fabs(dist1 - dist2) */
40	float dist1; /* From original coeffs */
41	float dist2; /* From IS'd coeffs */
42	float ener01;
43	};
44
45	struct AACISError ff_aac_is_encoding_err(AACEncContext *s, ChannelElement *cpe,
46	int start, int w, int g, float ener0,
47	float ener1, float ener01,
48	int use_pcoeffs, int phase);
49	void ff_aac_search_for_is(AACEncContext *s, AVCodecContext *avctx, ChannelElement *cpe);
50
51	#endif /* AVCODEC_AACENC_IS_H */
52