ffmpeg/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 "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 */