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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.  
  29. #include "aac.h"
  30. #include "audio_frame_queue.h"
  31. #include "psymodel.h"
  32.  
  33. typedef enum AACCoder {
  34.     AAC_CODER_FAAC = 0,
  35.     AAC_CODER_ANMR,
  36.     AAC_CODER_TWOLOOP,
  37.     AAC_CODER_FAST,
  38.  
  39.     AAC_CODER_NB,
  40. }AACCoder;
  41.  
  42. typedef struct AACEncOptions {
  43.     int stereo_mode;
  44.     int aac_coder;
  45. } AACEncOptions;
  46.  
  47. struct AACEncContext;
  48.  
  49. typedef struct AACCoefficientsEncoder {
  50.     void (*search_for_quantizers)(AVCodecContext *avctx, struct AACEncContext *s,
  51.                                   SingleChannelElement *sce, const float lambda);
  52.     void (*encode_window_bands_info)(struct AACEncContext *s, SingleChannelElement *sce,
  53.                                      int win, int group_len, const float lambda);
  54.     void (*quantize_and_encode_band)(struct AACEncContext *s, PutBitContext *pb, const float *in, int size,
  55.                                      int scale_idx, int cb, const float lambda);
  56.     void (*search_for_ms)(struct AACEncContext *s, ChannelElement *cpe, const float lambda);
  57. } AACCoefficientsEncoder;
  58.  
  59. extern AACCoefficientsEncoder ff_aac_coders[];
  60.  
  61. /**
  62.  * AAC encoder context
  63.  */
  64. typedef struct AACEncContext {
  65.     AVClass *av_class;
  66.     AACEncOptions options;                       ///< encoding options
  67.     PutBitContext pb;
  68.     FFTContext mdct1024;                         ///< long (1024 samples) frame transform context
  69.     FFTContext mdct128;                          ///< short (128 samples) frame transform context
  70.     AVFloatDSPContext fdsp;
  71.     float *planar_samples[6];                    ///< saved preprocessed input
  72.  
  73.     int samplerate_index;                        ///< MPEG-4 samplerate index
  74.     int channels;                                ///< channel count
  75.     const uint8_t *chan_map;                     ///< channel configuration map
  76.  
  77.     ChannelElement *cpe;                         ///< channel elements
  78.     FFPsyContext psy;
  79.     struct FFPsyPreprocessContext* psypp;
  80.     AACCoefficientsEncoder *coder;
  81.     int cur_channel;
  82.     int last_frame;
  83.     float lambda;
  84.     AudioFrameQueue afq;
  85.     DECLARE_ALIGNED(16, int,   qcoefs)[96];      ///< quantized coefficients
  86.     DECLARE_ALIGNED(32, float, scoefs)[1024];    ///< scaled coefficients
  87.  
  88.     struct {
  89.         float *samples;
  90.     } buffer;
  91. } AACEncContext;
  92.  
  93. extern float ff_aac_pow34sf_tab[428];
  94.  
  95. void ff_aac_coder_init_mips(AACEncContext *c);
  96.  
  97. #endif /* AVCODEC_AACENC_H */
  98.