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  1. /*
  2.  * Copyright (c) 2012 Justin Ruggles <justin.ruggles@gmail.com>
  3.  *
  4.  * This file is part of FFmpeg.
  5.  *
  6.  * FFmpeg is free software; you can redistribute it and/or
  7.  * modify it under the terms of the GNU Lesser General Public
  8.  * License as published by the Free Software Foundation; either
  9.  * version 2.1 of the License, or (at your option) any later version.
  10.  *
  11.  * FFmpeg is distributed in the hope that it will be useful,
  12.  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14.  * Lesser General Public License for more details.
  15.  *
  16.  * You should have received a copy of the GNU Lesser General Public
  17.  * License along with FFmpeg; if not, write to the Free Software
  18.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  19.  */
  20.  
  21. #ifndef AVRESAMPLE_INTERNAL_H
  22. #define AVRESAMPLE_INTERNAL_H
  23.  
  24. #include "libavutil/audio_fifo.h"
  25. #include "libavutil/log.h"
  26. #include "libavutil/opt.h"
  27. #include "libavutil/samplefmt.h"
  28. #include "avresample.h"
  29.  
  30. typedef struct AudioData AudioData;
  31. typedef struct AudioConvert AudioConvert;
  32. typedef struct AudioMix AudioMix;
  33. typedef struct ResampleContext ResampleContext;
  34.  
  35. enum RemapPoint {
  36.     REMAP_NONE,
  37.     REMAP_IN_COPY,
  38.     REMAP_IN_CONVERT,
  39.     REMAP_OUT_COPY,
  40.     REMAP_OUT_CONVERT,
  41. };
  42.  
  43. typedef struct ChannelMapInfo {
  44.     int channel_map[AVRESAMPLE_MAX_CHANNELS];   /**< source index of each output channel, -1 if not remapped */
  45.     int do_remap;                               /**< remap needed */
  46.     int channel_copy[AVRESAMPLE_MAX_CHANNELS];  /**< dest index to copy from */
  47.     int do_copy;                                /**< copy needed */
  48.     int channel_zero[AVRESAMPLE_MAX_CHANNELS];  /**< dest index to zero */
  49.     int do_zero;                                /**< zeroing needed */
  50.     int input_map[AVRESAMPLE_MAX_CHANNELS];     /**< dest index of each input channel */
  51. } ChannelMapInfo;
  52.  
  53. struct AVAudioResampleContext {
  54.     const AVClass *av_class;        /**< AVClass for logging and AVOptions  */
  55.  
  56.     uint64_t in_channel_layout;                 /**< input channel layout   */
  57.     enum AVSampleFormat in_sample_fmt;          /**< input sample format    */
  58.     int in_sample_rate;                         /**< input sample rate      */
  59.     uint64_t out_channel_layout;                /**< output channel layout  */
  60.     enum AVSampleFormat out_sample_fmt;         /**< output sample format   */
  61.     int out_sample_rate;                        /**< output sample rate     */
  62.     enum AVSampleFormat internal_sample_fmt;    /**< internal sample format */
  63.     enum AVMixCoeffType mix_coeff_type;         /**< mixing coefficient type */
  64.     double center_mix_level;                    /**< center mix level       */
  65.     double surround_mix_level;                  /**< surround mix level     */
  66.     double lfe_mix_level;                       /**< lfe mix level          */
  67.     int normalize_mix_level;                    /**< enable mix level normalization */
  68.     int force_resampling;                       /**< force resampling       */
  69.     int filter_size;                            /**< length of each FIR filter in the resampling filterbank relative to the cutoff frequency */
  70.     int phase_shift;                            /**< log2 of the number of entries in the resampling polyphase filterbank */
  71.     int linear_interp;                          /**< if 1 then the resampling FIR filter will be linearly interpolated */
  72.     double cutoff;                              /**< resampling cutoff frequency. 1.0 corresponds to half the output sample rate */
  73.     enum AVResampleFilterType filter_type;      /**< resampling filter type */
  74.     int kaiser_beta;                            /**< beta value for Kaiser window (only applicable if filter_type == AV_FILTER_TYPE_KAISER) */
  75.     enum AVResampleDitherMethod dither_method;  /**< dither method          */
  76.  
  77.     int in_channels;        /**< number of input channels                   */
  78.     int out_channels;       /**< number of output channels                  */
  79.     int resample_channels;  /**< number of channels used for resampling     */
  80.     int downmix_needed;     /**< downmixing is needed                       */
  81.     int upmix_needed;       /**< upmixing is needed                         */
  82.     int mixing_needed;      /**< either upmixing or downmixing is needed    */
  83.     int resample_needed;    /**< resampling is needed                       */
  84.     int in_convert_needed;  /**< input sample format conversion is needed   */
  85.     int out_convert_needed; /**< output sample format conversion is needed  */
  86.     int in_copy_needed;     /**< input data copy is needed                  */
  87.  
  88.     AudioData *in_buffer;           /**< buffer for converted input         */
  89.     AudioData *resample_out_buffer; /**< buffer for output from resampler   */
  90.     AudioData *out_buffer;          /**< buffer for converted output        */
  91.     AVAudioFifo *out_fifo;          /**< FIFO for output samples            */
  92.  
  93.     AudioConvert *ac_in;        /**< input sample format conversion context  */
  94.     AudioConvert *ac_out;       /**< output sample format conversion context */
  95.     ResampleContext *resample;  /**< resampling context                      */
  96.     AudioMix *am;               /**< channel mixing context                  */
  97.     enum AVMatrixEncoding matrix_encoding;      /**< matrixed stereo encoding */
  98.  
  99.     /**
  100.      * mix matrix
  101.      * only used if avresample_set_matrix() is called before avresample_open()
  102.      */
  103.     double *mix_matrix;
  104.  
  105.     int use_channel_map;
  106.     enum RemapPoint remap_point;
  107.     ChannelMapInfo ch_map_info;
  108. };
  109.  
  110.  
  111. void ff_audio_resample_init_aarch64(ResampleContext *c,
  112.                                     enum AVSampleFormat sample_fmt);
  113. void ff_audio_resample_init_arm(ResampleContext *c,
  114.                                 enum AVSampleFormat sample_fmt);
  115.  
  116. #endif /* AVRESAMPLE_INTERNAL_H */
  117.