1/*
2 * AAC encoder
3 * Copyright (C) 2008 Konstantin Shishkov
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#ifndef AVCODEC_AACENC_H
23#define AVCODEC_AACENC_H
24
25#include "avcodec.h"
26#include "put_bits.h"
27#include "dsputil.h"
28
29#include "aac.h"
30
31#include "psymodel.h"
32
33struct AACEncContext;
34
35typedef struct AACCoefficientsEncoder {
36    void (*search_for_quantizers)(AVCodecContext *avctx, struct AACEncContext *s,
37                                  SingleChannelElement *sce, const float lambda);
38    void (*encode_window_bands_info)(struct AACEncContext *s, SingleChannelElement *sce,
39                                     int win, int group_len, const float lambda);
40    void (*quantize_and_encode_band)(struct AACEncContext *s, PutBitContext *pb, const float *in, int size,
41                                     int scale_idx, int cb, const float lambda);
42    void (*search_for_ms)(struct AACEncContext *s, ChannelElement *cpe, const float lambda);
43} AACCoefficientsEncoder;
44
45extern AACCoefficientsEncoder ff_aac_coders[];
46
47/**
48 * AAC encoder context
49 */
50typedef struct AACEncContext {
51    PutBitContext pb;
52    FFTContext mdct1024;                         ///< long (1024 samples) frame transform context
53    FFTContext mdct128;                          ///< short (128 samples) frame transform context
54    DSPContext  dsp;
55    DECLARE_ALIGNED(16, FFTSample, output)[2048]; ///< temporary buffer for MDCT input coefficients
56    int16_t* samples;                            ///< saved preprocessed input
57
58    int samplerate_index;                        ///< MPEG-4 samplerate index
59
60    ChannelElement *cpe;                         ///< channel elements
61    FFPsyContext psy;
62    struct FFPsyPreprocessContext* psypp;
63    AACCoefficientsEncoder *coder;
64    int cur_channel;
65    int last_frame;
66    float lambda;
67    DECLARE_ALIGNED(16, int,   qcoefs)[96][2];   ///< quantized coefficients
68    DECLARE_ALIGNED(16, float, scoefs)[1024];    ///< scaled coefficients
69} AACEncContext;
70
71#endif /* AVCODEC_AACENC_H */
72