| 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 | #endif /* AVRESAMPLE_INTERNAL_H */ |