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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. #include "lpc.h"
  34.  
  35. typedef enum AACCoder {
  36.     AAC_CODER_FAAC = 0,
  37.     AAC_CODER_ANMR,
  38.     AAC_CODER_TWOLOOP,
  39.     AAC_CODER_FAST,
  40.  
  41.     AAC_CODER_NB,
  42. }AACCoder;
  43.  
  44. typedef struct AACEncOptions {
  45.     int stereo_mode;
  46.     int aac_coder;
  47.     int pns;
  48.     int tns;
  49.     int pred;
  50.     int intensity_stereo;
  51. } AACEncOptions;
  52.  
  53. struct AACEncContext;
  54.  
  55. typedef struct AACCoefficientsEncoder {
  56.     void (*search_for_quantizers)(AVCodecContext *avctx, struct AACEncContext *s,
  57.                                   SingleChannelElement *sce, const float lambda);
  58.     void (*encode_window_bands_info)(struct AACEncContext *s, SingleChannelElement *sce,
  59.                                      int win, int group_len, const float lambda);
  60.     void (*quantize_and_encode_band)(struct AACEncContext *s, PutBitContext *pb, const float *in, float *out, int size,
  61.                                      int scale_idx, int cb, const float lambda, int rtz);
  62.     void (*encode_tns_info)(struct AACEncContext *s, SingleChannelElement *sce);
  63.     void (*encode_main_pred)(struct AACEncContext *s, SingleChannelElement *sce);
  64.     void (*adjust_common_prediction)(struct AACEncContext *s, ChannelElement *cpe);
  65.     void (*apply_main_pred)(struct AACEncContext *s, SingleChannelElement *sce);
  66.     void (*apply_tns_filt)(struct AACEncContext *s, SingleChannelElement *sce);
  67.     void (*set_special_band_scalefactors)(struct AACEncContext *s, SingleChannelElement *sce);
  68.     void (*search_for_pns)(struct AACEncContext *s, AVCodecContext *avctx, SingleChannelElement *sce);
  69.     void (*search_for_tns)(struct AACEncContext *s, SingleChannelElement *sce);
  70.     void (*search_for_ms)(struct AACEncContext *s, ChannelElement *cpe);
  71.     void (*search_for_is)(struct AACEncContext *s, AVCodecContext *avctx, ChannelElement *cpe);
  72.     void (*search_for_pred)(struct AACEncContext *s, SingleChannelElement *sce);
  73. } AACCoefficientsEncoder;
  74.  
  75. extern AACCoefficientsEncoder ff_aac_coders[];
  76.  
  77. /**
  78.  * AAC encoder context
  79.  */
  80. typedef struct AACEncContext {
  81.     AVClass *av_class;
  82.     AACEncOptions options;                       ///< encoding options
  83.     PutBitContext pb;
  84.     FFTContext mdct1024;                         ///< long (1024 samples) frame transform context
  85.     FFTContext mdct128;                          ///< short (128 samples) frame transform context
  86.     AVFloatDSPContext *fdsp;
  87.     float *planar_samples[6];                    ///< saved preprocessed input
  88.  
  89.     int profile;                                 ///< copied from avctx
  90.     LPCContext lpc;                              ///< used by TNS
  91.     int samplerate_index;                        ///< MPEG-4 samplerate index
  92.     int channels;                                ///< channel count
  93.     const uint8_t *chan_map;                     ///< channel configuration map
  94.  
  95.     ChannelElement *cpe;                         ///< channel elements
  96.     FFPsyContext psy;
  97.     struct FFPsyPreprocessContext* psypp;
  98.     AACCoefficientsEncoder *coder;
  99.     int cur_channel;
  100.     int last_frame;
  101.     float lambda;
  102.     AudioFrameQueue afq;
  103.     DECLARE_ALIGNED(16, int,   qcoefs)[96];      ///< quantized coefficients
  104.     DECLARE_ALIGNED(32, float, scoefs)[1024];    ///< scaled coefficients
  105.  
  106.     struct {
  107.         float *samples;
  108.     } buffer;
  109. } AACEncContext;
  110.  
  111. void ff_aac_coder_init_mips(AACEncContext *c);
  112.  
  113. #endif /* AVCODEC_AACENC_H */
  114.