libavcodec/aacenc.h

   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
  33 struct AACEncContext;
  34
  35 typedef 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
  45 extern AACCoefficientsEncoder ff_aac_coders[];
  46
  47 /**
  48  * AAC encoder context
  49  */
  50 typedef struct AACEncContext {
  51     PutBitContext pb;
  52     MDCTContext mdct1024;                        ///< long (1024 samples) frame transform context
  53     MDCTContext 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 */