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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 | #endif /* AVRESAMPLE_INTERNAL_H */ |