libavcodec/aacenc.h

   1 /*
   2  * AAC encoder
   3  * Copyright (C) 2008 Konstantin Shishkov
   4  *
   5  * This file is part of Libav.
   6  *
   7  * Libav 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  * Libav 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 Libav; 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 typedef struct AACEncOptions {
  35     int stereo_mode;
  36 } AACEncOptions;
  37
  38 struct AACEncContext;
  39
  40 typedef struct AACCoefficientsEncoder {
  41     void (*search_for_quantizers)(AVCodecContext *avctx, struct AACEncContext *s,
  42                                   SingleChannelElement *sce, const float lambda);
  43     void (*encode_window_bands_info)(struct AACEncContext *s, SingleChannelElement *sce,
  44                                      int win, int group_len, const float lambda);
  45     void (*quantize_and_encode_band)(struct AACEncContext *s, PutBitContext *pb, const float *in, int size,
  46                                      int scale_idx, int cb, const float lambda);
  47     void (*search_for_ms)(struct AACEncContext *s, ChannelElement *cpe, const float lambda);
  48 } AACCoefficientsEncoder;
  49
  50 extern AACCoefficientsEncoder ff_aac_coders[];
  51
  52 /**
  53  * AAC encoder context
  54  */
  55 typedef struct AACEncContext {
  56     AVClass *av_class;
  57     AACEncOptions options;                       ///< encoding options
  58     PutBitContext pb;
  59     FFTContext mdct1024;                         ///< long (1024 samples) frame transform context
  60     FFTContext mdct128;                          ///< short (128 samples) frame transform context
  61     AVFloatDSPContext fdsp;
  62     float *planar_samples[6];                    ///< saved preprocessed input
  63
  64     int samplerate_index;                        ///< MPEG-4 samplerate index
  65     int channels;                                ///< channel count
  66     const uint8_t *chan_map;                     ///< channel configuration map
  67
  68     ChannelElement *cpe;                         ///< channel elements
  69     FFPsyContext psy;
  70     struct FFPsyPreprocessContext* psypp;
  71     AACCoefficientsEncoder *coder;
  72     int cur_channel;
  73     int last_frame;
  74     float lambda;
  75     AudioFrameQueue afq;
  76     DECLARE_ALIGNED(16, int,   qcoefs)[96];      ///< quantized coefficients
  77     DECLARE_ALIGNED(32, float, scoefs)[1024];    ///< scaled coefficients
  78
  79     struct {
  80         float *samples;
  81     } buffer;
  82 } AACEncContext;
  83
  84 extern float ff_aac_pow34sf_tab[428];
  85
  86 #endif /* AVCODEC_AACENC_H */