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aacenc.h
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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 "libavutil/float_dsp.h"
26 #include "avcodec.h"
27 #include "put_bits.h"
28 #include "dsputil.h"
29 
30 #include "aac.h"
31 #include "audio_frame_queue.h"
32 #include "psymodel.h"
33 
34 #define AAC_CODER_NB 4
35 
36 typedef struct AACEncOptions {
38  int aac_coder;
40 
41 struct AACEncContext;
42 
43 typedef struct AACCoefficientsEncoder {
45  SingleChannelElement *sce, const float lambda);
47  int win, int group_len, const float lambda);
48  void (*quantize_and_encode_band)(struct AACEncContext *s, PutBitContext *pb, const float *in, int size,
49  int scale_idx, int cb, const float lambda);
50  void (*search_for_ms)(struct AACEncContext *s, ChannelElement *cpe, const float lambda);
52 
54 
55 /**
56  * AAC encoder context
57  */
58 typedef struct AACEncContext {
60  AACEncOptions options; ///< encoding options
62  FFTContext mdct1024; ///< long (1024 samples) frame transform context
63  FFTContext mdct128; ///< short (128 samples) frame transform context
66  float *planar_samples[6]; ///< saved preprocessed input
67 
68  int samplerate_index; ///< MPEG-4 samplerate index
69  int channels; ///< channel count
70  const uint8_t *chan_map; ///< channel configuration map
71 
72  ChannelElement *cpe; ///< channel elements
78  float lambda;
80  DECLARE_ALIGNED(16, int, qcoefs)[96]; ///< quantized coefficients
81  DECLARE_ALIGNED(32, float, scoefs)[1024]; ///< scaled coefficients
82 
83  struct {
84  float *samples;
85  } buffer;
87 
88 extern float ff_aac_pow34sf_tab[428];
89 
90 #endif /* AVCODEC_AACENC_H */