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