| Line | Branch | Exec | Source |
|---|---|---|---|
| 1 | /* | ||
| 2 | * Copyright (C) 2012-2013 Michael Niedermayer (michaelni@gmx.at) | ||
| 3 | * | ||
| 4 | * This file is part of libswresample | ||
| 5 | * | ||
| 6 | * libswresample 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 | * libswresample 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 libswresample; if not, write to the Free Software | ||
| 18 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | ||
| 19 | */ | ||
| 20 | |||
| 21 | #include "libavutil/avassert.h" | ||
| 22 | #include "libavutil/mem.h" | ||
| 23 | #include "swresample_internal.h" | ||
| 24 | |||
| 25 | #include "noise_shaping_data.c" | ||
| 26 | |||
| 27 | ✗ | int swri_get_dither(SwrContext *s, void *dst, int len, unsigned seed, enum AVSampleFormat noise_fmt) { | |
| 28 | ✗ | double scale = s->dither.noise_scale; | |
| 29 | #define TMP_EXTRA 2 | ||
| 30 | ✗ | double *tmp = av_malloc_array(len + TMP_EXTRA, sizeof(double)); | |
| 31 | int i; | ||
| 32 | |||
| 33 | ✗ | if (!tmp) | |
| 34 | ✗ | return AVERROR(ENOMEM); | |
| 35 | |||
| 36 | ✗ | for(i=0; i<len + TMP_EXTRA; i++){ | |
| 37 | double v; | ||
| 38 | ✗ | seed = seed* 1664525 + 1013904223; | |
| 39 | |||
| 40 | ✗ | switch(s->dither.method){ | |
| 41 | ✗ | case SWR_DITHER_RECTANGULAR: v= ((double)seed) / UINT_MAX - 0.5; break; | |
| 42 | ✗ | default: | |
| 43 | ✗ | av_assert0(s->dither.method < SWR_DITHER_NB); | |
| 44 | ✗ | v = ((double)seed) / UINT_MAX; | |
| 45 | ✗ | seed = seed*1664525 + 1013904223; | |
| 46 | ✗ | v-= ((double)seed) / UINT_MAX; | |
| 47 | ✗ | break; | |
| 48 | } | ||
| 49 | ✗ | tmp[i] = v; | |
| 50 | } | ||
| 51 | |||
| 52 | ✗ | for(i=0; i<len; i++){ | |
| 53 | double v; | ||
| 54 | |||
| 55 | ✗ | switch(s->dither.method){ | |
| 56 | ✗ | default: | |
| 57 | ✗ | av_assert0(s->dither.method < SWR_DITHER_NB); | |
| 58 | ✗ | v = tmp[i]; | |
| 59 | ✗ | break; | |
| 60 | ✗ | case SWR_DITHER_TRIANGULAR_HIGHPASS : | |
| 61 | ✗ | v = (- tmp[i] + 2*tmp[i+1] - tmp[i+2]) / sqrt(6); | |
| 62 | ✗ | break; | |
| 63 | } | ||
| 64 | |||
| 65 | ✗ | v*= scale; | |
| 66 | |||
| 67 | ✗ | switch(noise_fmt){ | |
| 68 | ✗ | case AV_SAMPLE_FMT_S16P: ((int16_t*)dst)[i] = v; break; | |
| 69 | ✗ | case AV_SAMPLE_FMT_S32P: ((int32_t*)dst)[i] = v; break; | |
| 70 | ✗ | case AV_SAMPLE_FMT_FLTP: ((float *)dst)[i] = v; break; | |
| 71 | ✗ | case AV_SAMPLE_FMT_DBLP: ((double *)dst)[i] = v; break; | |
| 72 | ✗ | default: av_assert0(0); | |
| 73 | } | ||
| 74 | } | ||
| 75 | |||
| 76 | ✗ | av_free(tmp); | |
| 77 | ✗ | return 0; | |
| 78 | } | ||
| 79 | |||
| 80 | 1524 | av_cold int swri_dither_init(SwrContext *s, enum AVSampleFormat out_fmt, enum AVSampleFormat in_fmt) | |
| 81 | { | ||
| 82 | int i; | ||
| 83 | 1524 | double scale = 0; | |
| 84 | |||
| 85 |
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1524 | if (s->dither.method > SWR_DITHER_TRIANGULAR_HIGHPASS && s->dither.method <= SWR_DITHER_NS) |
| 86 | ✗ | return AVERROR(EINVAL); | |
| 87 | |||
| 88 | 1524 | out_fmt = av_get_packed_sample_fmt(out_fmt); | |
| 89 | 1524 | in_fmt = av_get_packed_sample_fmt( in_fmt); | |
| 90 | |||
| 91 |
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1524 | if(in_fmt == AV_SAMPLE_FMT_FLT || in_fmt == AV_SAMPLE_FMT_DBL){ |
| 92 |
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658 | if(out_fmt == AV_SAMPLE_FMT_S32) scale = 1.0/(1LL<<31); |
| 93 |
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658 | if(out_fmt == AV_SAMPLE_FMT_S16) scale = 1.0/(1LL<<15); |
| 94 |
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658 | if(out_fmt == AV_SAMPLE_FMT_U8 ) scale = 1.0/(1LL<< 7); |
| 95 | } | ||
| 96 |
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1524 | if(in_fmt == AV_SAMPLE_FMT_S32 && out_fmt == AV_SAMPLE_FMT_S32 && (s->dither.output_sample_bits&31)) scale = 1; |
| 97 |
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1524 | if(in_fmt == AV_SAMPLE_FMT_S32 && out_fmt == AV_SAMPLE_FMT_S16) scale = 1<<16; |
| 98 |
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1524 | if(in_fmt == AV_SAMPLE_FMT_S32 && out_fmt == AV_SAMPLE_FMT_U8 ) scale = 1<<24; |
| 99 |
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1524 | if(in_fmt == AV_SAMPLE_FMT_S16 && out_fmt == AV_SAMPLE_FMT_U8 ) scale = 1<<8; |
| 100 | |||
| 101 | 1524 | scale *= s->dither.scale; | |
| 102 | |||
| 103 |
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1524 | if (out_fmt == AV_SAMPLE_FMT_S32 && s->dither.output_sample_bits) |
| 104 | 9 | scale *= 1<<(32-s->dither.output_sample_bits); | |
| 105 | |||
| 106 |
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1524 | if (scale == 0) { |
| 107 | 1022 | s->dither.method = 0; | |
| 108 | 1022 | return 0; | |
| 109 | } | ||
| 110 | |||
| 111 | 502 | s->dither.ns_pos = 0; | |
| 112 | 502 | s->dither.noise_scale= scale; | |
| 113 | 502 | s->dither.ns_scale = scale; | |
| 114 |
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502 | s->dither.ns_scale_1 = scale ? 1/scale : 0; |
| 115 | 502 | memset(s->dither.ns_errors, 0, sizeof(s->dither.ns_errors)); | |
| 116 |
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8032 | for (i=0; filters[i].coefs; i++) { |
| 117 | 7530 | const filter_t *f = &filters[i]; | |
| 118 |
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7530 | if (llabs(s->out_sample_rate - f->rate)*20 <= f->rate && f->name == s->dither.method) { |
| 119 | int j; | ||
| 120 | ✗ | s->dither.ns_taps = f->len; | |
| 121 | ✗ | for (j=0; j<f->len; j++) | |
| 122 | ✗ | s->dither.ns_coeffs[j] = f->coefs[j]; | |
| 123 | ✗ | s->dither.ns_scale_1 *= 1 - exp(f->gain_cB * M_LN10 * 0.005) * 2 / (1<<(8*av_get_bytes_per_sample(out_fmt))); | |
| 124 | ✗ | break; | |
| 125 | } | ||
| 126 | } | ||
| 127 |
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502 | if (!filters[i].coefs && s->dither.method > SWR_DITHER_NS) { |
| 128 | ✗ | av_log(s, AV_LOG_WARNING, "Requested noise shaping dither not available at this sampling rate, using triangular hp dither\n"); | |
| 129 | ✗ | s->dither.method = SWR_DITHER_TRIANGULAR_HIGHPASS; | |
| 130 | } | ||
| 131 | |||
| 132 | 502 | return 0; | |
| 133 | } | ||
| 134 | |||
| 135 | #define TEMPLATE_DITHER_S16 | ||
| 136 | #include "dither_template.c" | ||
| 137 | #undef TEMPLATE_DITHER_S16 | ||
| 138 | |||
| 139 | #define TEMPLATE_DITHER_S32 | ||
| 140 | #include "dither_template.c" | ||
| 141 | #undef TEMPLATE_DITHER_S32 | ||
| 142 | |||
| 143 | #define TEMPLATE_DITHER_FLT | ||
| 144 | #include "dither_template.c" | ||
| 145 | #undef TEMPLATE_DITHER_FLT | ||
| 146 | |||
| 147 | #define TEMPLATE_DITHER_DBL | ||
| 148 | #include "dither_template.c" | ||
| 149 | #undef TEMPLATE_DITHER_DBL | ||
| 150 |