/*
  * Copyright (c) 2012 Justin Ruggles <justin.ruggles@gmail.com>
  *

  * This file is part of FFmpeg.

  *

  * FFmpeg is free software; you can redistribute it and/or

  * modify it under the terms of the GNU Lesser General Public
  * License as published by the Free Software Foundation; either
  * version 2.1 of the License, or (at your option) any later version.
  *

  * FFmpeg is distributed in the hope that it will be useful,

  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Lesser General Public License for more details.
  *
  * You should have received a copy of the GNU Lesser General Public

  * License along with FFmpeg; if not, write to the Free Software

  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #ifndef AVRESAMPLE_INTERNAL_H
 #define AVRESAMPLE_INTERNAL_H
 
 #include "libavutil/audio_fifo.h"
 #include "libavutil/log.h"
 #include "libavutil/opt.h"
 #include "libavutil/samplefmt.h"
 #include "avresample.h"

 
 typedef struct AudioData AudioData;
 typedef struct AudioConvert AudioConvert;
 typedef struct AudioMix AudioMix;
 typedef struct ResampleContext ResampleContext;

 enum RemapPoint {
     REMAP_NONE,
     REMAP_IN_COPY,
     REMAP_IN_CONVERT,
     REMAP_OUT_COPY,
     REMAP_OUT_CONVERT,
 };
 
 typedef struct ChannelMapInfo {
     int channel_map[AVRESAMPLE_MAX_CHANNELS];   /**< source index of each output channel, -1 if not remapped */
     int do_remap;                               /**< remap needed */
     int channel_copy[AVRESAMPLE_MAX_CHANNELS];  /**< dest index to copy from */
     int do_copy;                                /**< copy needed */
     int channel_zero[AVRESAMPLE_MAX_CHANNELS];  /**< dest index to zero */
     int do_zero;                                /**< zeroing needed */
     int input_map[AVRESAMPLE_MAX_CHANNELS];     /**< dest index of each input channel */
 } ChannelMapInfo;
 

 struct AVAudioResampleContext {
     const AVClass *av_class;        /**< AVClass for logging and AVOptions  */
 
     uint64_t in_channel_layout;                 /**< input channel layout   */
     enum AVSampleFormat in_sample_fmt;          /**< input sample format    */
     int in_sample_rate;                         /**< input sample rate      */
     uint64_t out_channel_layout;                /**< output channel layout  */
     enum AVSampleFormat out_sample_fmt;         /**< output sample format   */
     int out_sample_rate;                        /**< output sample rate     */
     enum AVSampleFormat internal_sample_fmt;    /**< internal sample format */
     enum AVMixCoeffType mix_coeff_type;         /**< mixing coefficient type */
     double center_mix_level;                    /**< center mix level       */
     double surround_mix_level;                  /**< surround mix level     */
     double lfe_mix_level;                       /**< lfe mix level          */

     int normalize_mix_level;                    /**< enable mix level normalization */

     int force_resampling;                       /**< force resampling       */
     int filter_size;                            /**< length of each FIR filter in the resampling filterbank relative to the cutoff frequency */
     int phase_shift;                            /**< log2 of the number of entries in the resampling polyphase filterbank */
     int linear_interp;                          /**< if 1 then the resampling FIR filter will be linearly interpolated */
     double cutoff;                              /**< resampling cutoff frequency. 1.0 corresponds to half the output sample rate */

     enum AVResampleFilterType filter_type;      /**< resampling filter type */
     int kaiser_beta;                            /**< beta value for Kaiser window (only applicable if filter_type == AV_FILTER_TYPE_KAISER) */

     enum AVResampleDitherMethod dither_method;  /**< dither method          */

 
     int in_channels;        /**< number of input channels                   */
     int out_channels;       /**< number of output channels                  */
     int resample_channels;  /**< number of channels used for resampling     */
     int downmix_needed;     /**< downmixing is needed                       */
     int upmix_needed;       /**< upmixing is needed                         */
     int mixing_needed;      /**< either upmixing or downmixing is needed    */
     int resample_needed;    /**< resampling is needed                       */
     int in_convert_needed;  /**< input sample format conversion is needed   */
     int out_convert_needed; /**< output sample format conversion is needed  */

     int in_copy_needed;     /**< input data copy is needed                  */

 
     AudioData *in_buffer;           /**< buffer for converted input         */
     AudioData *resample_out_buffer; /**< buffer for output from resampler   */
     AudioData *out_buffer;          /**< buffer for converted output        */
     AVAudioFifo *out_fifo;          /**< FIFO for output samples            */
 
     AudioConvert *ac_in;        /**< input sample format conversion context  */
     AudioConvert *ac_out;       /**< output sample format conversion context */
     ResampleContext *resample;  /**< resampling context                      */
     AudioMix *am;               /**< channel mixing context                  */

     enum AVMatrixEncoding matrix_encoding;      /**< matrixed stereo encoding */

 
     /**
      * mix matrix
      * only used if avresample_set_matrix() is called before avresample_open()
      */
     double *mix_matrix;

 
     int use_channel_map;
     enum RemapPoint remap_point;
     ChannelMapInfo ch_map_info;

 };
 

 
 void ff_audio_resample_init_aarch64(ResampleContext *c,
                                     enum AVSampleFormat sample_fmt);

 void ff_audio_resample_init_arm(ResampleContext *c,
                                 enum AVSampleFormat sample_fmt);
 

 #endif /* AVRESAMPLE_INTERNAL_H */