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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_DITHER_H | |
22 | #define AVRESAMPLE_DITHER_H | |
23 | ||
24 | #include "avresample.h" | |
25 | #include "audio_data.h" | |
26 | ||
27 | typedef struct DitherContext DitherContext; | |
28 | ||
29 | typedef struct DitherDSPContext { | |
30 | /** | |
31 | * Convert samples from flt to s16 with added dither noise. | |
32 | * | |
33 | * @param dst destination float array, range -0.5 to 0.5 | |
34 | * @param src source int array, range INT_MIN to INT_MAX. | |
35 | * @param dither float dither noise array | |
36 | * @param len number of samples | |
37 | */ | |
38 | void (*quantize)(int16_t *dst, const float *src, float *dither, int len); | |
39 | ||
40 | int ptr_align; ///< src and dst constraits for quantize() | |
41 | int samples_align; ///< len constraits for quantize() | |
42 | ||
43 | /** | |
44 | * Convert dither noise from int to float with triangular distribution. | |
45 | * | |
46 | * @param dst destination float array, range -0.5 to 0.5 | |
47 | * constraints: 32-byte aligned | |
48 | * @param src0 source int array, range INT_MIN to INT_MAX. | |
49 | * the array size is len * 2 | |
50 | * constraints: 32-byte aligned | |
51 | * @param len number of output noise samples | |
52 | * constraints: multiple of 16 | |
53 | */ | |
54 | void (*dither_int_to_float)(float *dst, int *src0, int len); | |
55 | } DitherDSPContext; | |
56 | ||
57 | /** | |
58 | * Allocate and initialize a DitherContext. | |
59 | * | |
60 | * The parameters in the AVAudioResampleContext are used to initialize the | |
61 | * DitherContext. | |
62 | * | |
63 | * @param avr AVAudioResampleContext | |
64 | * @return newly-allocated DitherContext | |
65 | */ | |
66 | DitherContext *ff_dither_alloc(AVAudioResampleContext *avr, | |
67 | enum AVSampleFormat out_fmt, | |
68 | enum AVSampleFormat in_fmt, | |
69 | int channels, int sample_rate, int apply_map); | |
70 | ||
71 | /** | |
72 | * Free a DitherContext. | |
73 | * | |
74 | * @param c DitherContext | |
75 | */ | |
76 | void ff_dither_free(DitherContext **c); | |
77 | ||
78 | /** | |
79 | * Convert audio sample format with dithering. | |
80 | * | |
81 | * @param c DitherContext | |
82 | * @param dst destination audio data | |
83 | * @param src source audio data | |
84 | * @return 0 if ok, negative AVERROR code on failure | |
85 | */ | |
86 | int ff_convert_dither(DitherContext *c, AudioData *dst, AudioData *src); | |
87 | ||
88 | /* arch-specific initialization functions */ | |
89 | ||
90 | void ff_dither_init_x86(DitherDSPContext *ddsp, | |
91 | enum AVResampleDitherMethod method); | |
92 | ||
93 | #endif /* AVRESAMPLE_DITHER_H */ |