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| 4349 | Serge | 1 | /* |
| 2 | * Copyright (c) 2012 Justin Ruggles |
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| 3 | * |
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| 4 | * This file is part of FFmpeg. |
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| 5 | * |
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| 6 | * FFmpeg is free software; you can redistribute it and/or |
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| 7 | * modify it under the terms of the GNU Lesser General Public |
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| 8 | * License as published by the Free Software Foundation; either |
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| 9 | * version 2.1 of the License, or (at your option) any later version. |
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| 10 | * |
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| 11 | * FFmpeg is distributed in the hope that it will be useful, |
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| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 14 | * Lesser General Public License for more details. |
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| 15 | * |
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| 16 | * You should have received a copy of the GNU Lesser General Public |
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| 17 | * License along with FFmpeg; if not, write to the Free Software |
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| 18 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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| 19 | */ |
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| 20 | |||
| 21 | #ifndef AVRESAMPLE_INTERNAL_H |
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| 22 | #define AVRESAMPLE_INTERNAL_H |
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| 23 | |||
| 24 | #include "libavutil/audio_fifo.h" |
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| 25 | #include "libavutil/log.h" |
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| 26 | #include "libavutil/opt.h" |
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| 27 | #include "libavutil/samplefmt.h" |
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| 28 | #include "avresample.h" |
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| 29 | |||
| 30 | typedef struct AudioData AudioData; |
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| 31 | typedef struct AudioConvert AudioConvert; |
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| 32 | typedef struct AudioMix AudioMix; |
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| 33 | typedef struct ResampleContext ResampleContext; |
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| 34 | |||
| 35 | enum RemapPoint { |
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| 36 | REMAP_NONE, |
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| 37 | REMAP_IN_COPY, |
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| 38 | REMAP_IN_CONVERT, |
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| 39 | REMAP_OUT_COPY, |
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| 40 | REMAP_OUT_CONVERT, |
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| 41 | }; |
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| 42 | |||
| 43 | typedef struct ChannelMapInfo { |
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| 44 | int channel_map[AVRESAMPLE_MAX_CHANNELS]; /**< source index of each output channel, -1 if not remapped */ |
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| 45 | int do_remap; /**< remap needed */ |
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| 46 | int channel_copy[AVRESAMPLE_MAX_CHANNELS]; /**< dest index to copy from */ |
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| 47 | int do_copy; /**< copy needed */ |
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| 48 | int channel_zero[AVRESAMPLE_MAX_CHANNELS]; /**< dest index to zero */ |
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| 49 | int do_zero; /**< zeroing needed */ |
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| 50 | int input_map[AVRESAMPLE_MAX_CHANNELS]; /**< dest index of each input channel */ |
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| 51 | } ChannelMapInfo; |
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| 52 | |||
| 53 | struct AVAudioResampleContext { |
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| 54 | const AVClass *av_class; /**< AVClass for logging and AVOptions */ |
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| 55 | |||
| 56 | uint64_t in_channel_layout; /**< input channel layout */ |
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| 57 | enum AVSampleFormat in_sample_fmt; /**< input sample format */ |
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| 58 | int in_sample_rate; /**< input sample rate */ |
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| 59 | uint64_t out_channel_layout; /**< output channel layout */ |
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| 60 | enum AVSampleFormat out_sample_fmt; /**< output sample format */ |
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| 61 | int out_sample_rate; /**< output sample rate */ |
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| 62 | enum AVSampleFormat internal_sample_fmt; /**< internal sample format */ |
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| 63 | enum AVMixCoeffType mix_coeff_type; /**< mixing coefficient type */ |
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| 64 | double center_mix_level; /**< center mix level */ |
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| 65 | double surround_mix_level; /**< surround mix level */ |
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| 66 | double lfe_mix_level; /**< lfe mix level */ |
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| 67 | int normalize_mix_level; /**< enable mix level normalization */ |
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| 68 | int force_resampling; /**< force resampling */ |
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| 69 | int filter_size; /**< length of each FIR filter in the resampling filterbank relative to the cutoff frequency */ |
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| 70 | int phase_shift; /**< log2 of the number of entries in the resampling polyphase filterbank */ |
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| 71 | int linear_interp; /**< if 1 then the resampling FIR filter will be linearly interpolated */ |
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| 72 | double cutoff; /**< resampling cutoff frequency. 1.0 corresponds to half the output sample rate */ |
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| 73 | enum AVResampleFilterType filter_type; /**< resampling filter type */ |
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| 74 | int kaiser_beta; /**< beta value for Kaiser window (only applicable if filter_type == AV_FILTER_TYPE_KAISER) */ |
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| 75 | enum AVResampleDitherMethod dither_method; /**< dither method */ |
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| 76 | |||
| 77 | int in_channels; /**< number of input channels */ |
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| 78 | int out_channels; /**< number of output channels */ |
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| 79 | int resample_channels; /**< number of channels used for resampling */ |
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| 80 | int downmix_needed; /**< downmixing is needed */ |
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| 81 | int upmix_needed; /**< upmixing is needed */ |
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| 82 | int mixing_needed; /**< either upmixing or downmixing is needed */ |
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| 83 | int resample_needed; /**< resampling is needed */ |
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| 84 | int in_convert_needed; /**< input sample format conversion is needed */ |
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| 85 | int out_convert_needed; /**< output sample format conversion is needed */ |
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| 86 | int in_copy_needed; /**< input data copy is needed */ |
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| 87 | |||
| 88 | AudioData *in_buffer; /**< buffer for converted input */ |
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| 89 | AudioData *resample_out_buffer; /**< buffer for output from resampler */ |
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| 90 | AudioData *out_buffer; /**< buffer for converted output */ |
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| 91 | AVAudioFifo *out_fifo; /**< FIFO for output samples */ |
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| 92 | |||
| 93 | AudioConvert *ac_in; /**< input sample format conversion context */ |
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| 94 | AudioConvert *ac_out; /**< output sample format conversion context */ |
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| 95 | ResampleContext *resample; /**< resampling context */ |
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| 96 | AudioMix *am; /**< channel mixing context */ |
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| 97 | enum AVMatrixEncoding matrix_encoding; /**< matrixed stereo encoding */ |
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| 98 | |||
| 99 | /** |
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| 100 | * mix matrix |
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| 101 | * only used if avresample_set_matrix() is called before avresample_open() |
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| 102 | */ |
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| 103 | double *mix_matrix; |
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| 104 | |||
| 105 | int use_channel_map; |
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| 106 | enum RemapPoint remap_point; |
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| 107 | ChannelMapInfo ch_map_info; |
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| 108 | }; |
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| 109 | |||
| 110 | #endif /* AVRESAMPLE_INTERNAL_H */ |