FreeCalypso > hg > gsm-codec-lib

annotate libtest/wavreader.c @ 183:452c1d5a6268

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libgsmefr BFI w/o data: emit zero output after decoder reset In real-life usage, each EFR decoder session will most likely begin with lots of BFI frames before the first real frame arrives. However, because the spec-defined home state of the decoder is speech rather than CN, our regular logic for BFI w/o data would have to feed pseudorandom noise to the decoder (in the "fixed codebook excitation pulses" part), which is silly to do at the beginning of the decoder session right out of reset. Therefore, let's check reset_flag_old, and if we are still in the reset state, simply emit zero output.
author Mychaela Falconia <falcon@freecalypso.org>
date Tue, 03 Jan 2023 00:12:18 +0000
parents 634df6435e16
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
7
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1 /* ------------------------------------------------------------------
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2 * Copyright (C) 2009 Martin Storsjo
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3 *
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4 * Licensed under the Apache License, Version 2.0 (the "License");
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5 * you may not use this file except in compliance with the License.
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6 * You may obtain a copy of the License at
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7 *
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8 * http://www.apache.org/licenses/LICENSE-2.0
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9 *
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10 * Unless required by applicable law or agreed to in writing, software
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11 * distributed under the License is distributed on an "AS IS" BASIS,
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12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
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13 * express or implied.
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14 * See the License for the specific language governing permissions
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15 * and limitations under the License.
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16 * -------------------------------------------------------------------
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17 */
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18
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19 #include "wavreader.h"
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20 #include <stdio.h>
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21 #include <stdlib.h>
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22 #include <string.h>
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23 #include <stdint.h>
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24
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25 #define TAG(a, b, c, d) (((a) << 24) | ((b) << 16) | ((c) << 8) | (d))
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26
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27 struct wav_reader {
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28 FILE *wav;
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29 uint32_t data_length;
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30
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31 int format;
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32 int sample_rate;
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33 int bits_per_sample;
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34 int channels;
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35 int byte_rate;
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36 int block_align;
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37 };
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38
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39 static uint32_t read_tag(struct wav_reader* wr) {
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40 uint32_t tag = 0;
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41 tag = (tag << 8) | fgetc(wr->wav);
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42 tag = (tag << 8) | fgetc(wr->wav);
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43 tag = (tag << 8) | fgetc(wr->wav);
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44 tag = (tag << 8) | fgetc(wr->wav);
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45 return tag;
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46 }
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47
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48 static uint32_t read_int32(struct wav_reader* wr) {
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49 uint32_t value = 0;
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50 value |= fgetc(wr->wav) << 0;
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51 value |= fgetc(wr->wav) << 8;
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52 value |= fgetc(wr->wav) << 16;
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53 value |= fgetc(wr->wav) << 24;
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54 return value;
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55 }
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56
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57 static uint16_t read_int16(struct wav_reader* wr) {
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58 uint16_t value = 0;
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59 value |= fgetc(wr->wav) << 0;
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60 value |= fgetc(wr->wav) << 8;
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61 return value;
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62 }
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63
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64 void* wav_read_open(const char *filename) {
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65 struct wav_reader* wr = (struct wav_reader*) malloc(sizeof(*wr));
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66 long data_pos = 0;
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67 memset(wr, 0, sizeof(*wr));
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68
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69 wr->wav = fopen(filename, "rb");
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70 if (wr->wav == NULL) {
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71 free(wr);
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72 return NULL;
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73 }
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74
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75 while (1) {
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76 uint32_t tag, tag2, length;
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77 tag = read_tag(wr);
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78 if (feof(wr->wav))
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79 break;
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80 length = read_int32(wr);
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81 if (tag != TAG('R', 'I', 'F', 'F') || length < 4) {
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82 fseek(wr->wav, length, SEEK_CUR);
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83 continue;
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84 }
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85 tag2 = read_tag(wr);
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86 length -= 4;
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87 if (tag2 != TAG('W', 'A', 'V', 'E')) {
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88 fseek(wr->wav, length, SEEK_CUR);
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89 continue;
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90 }
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91 // RIFF chunk found, iterate through it
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92 while (length >= 8) {
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93 uint32_t subtag, sublength;
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94 subtag = read_tag(wr);
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95 if (feof(wr->wav))
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96 break;
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97 sublength = read_int32(wr);
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98 length -= 8;
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99 if (length < sublength)
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100 break;
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101 if (subtag == TAG('f', 'm', 't', ' ')) {
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102 if (sublength < 16) {
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103 // Insufficient data for 'fmt '
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104 break;
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105 }
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106 wr->format = read_int16(wr);
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107 wr->channels = read_int16(wr);
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108 wr->sample_rate = read_int32(wr);
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109 wr->byte_rate = read_int32(wr);
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110 wr->block_align = read_int16(wr);
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111 wr->bits_per_sample = read_int16(wr);
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112 fseek(wr->wav, sublength - 16, SEEK_CUR);
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113 } else if (subtag == TAG('d', 'a', 't', 'a')) {
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114 data_pos = ftell(wr->wav);
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115 wr->data_length = sublength;
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116 fseek(wr->wav, sublength, SEEK_CUR);
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117 } else {
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118 fseek(wr->wav, sublength, SEEK_CUR);
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119 }
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Mychaela Falconia <falcon@freecalypso.org>
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120 length -= sublength;
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121 }
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122 if (length > 0) {
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parents:
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123 // Bad chunk?
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124 fseek(wr->wav, length, SEEK_CUR);
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125 }
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126 }
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Mychaela Falconia <falcon@freecalypso.org>
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127 fseek(wr->wav, data_pos, SEEK_SET);
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128 return wr;
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129 }
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130
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131 void wav_read_close(void* obj) {
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132 struct wav_reader* wr = (struct wav_reader*) obj;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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133 fclose(wr->wav);
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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134 free(wr);
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135 }
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136
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Mychaela Falconia <falcon@freecalypso.org>
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137 int wav_get_header(void* obj, int* format, int* channels, int* sample_rate, int* bits_per_sample, unsigned int* data_length) {
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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138 struct wav_reader* wr = (struct wav_reader*) obj;
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Mychaela Falconia <falcon@freecalypso.org>
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139 if (format)
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Mychaela Falconia <falcon@freecalypso.org>
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140 *format = wr->format;
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parents:
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141 if (channels)
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142 *channels = wr->channels;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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143 if (sample_rate)
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Mychaela Falconia <falcon@freecalypso.org>
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144 *sample_rate = wr->sample_rate;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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145 if (bits_per_sample)
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parents:
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146 *bits_per_sample = wr->bits_per_sample;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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147 if (data_length)
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148 *data_length = wr->data_length;
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149 return wr->format && wr->sample_rate;
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150 }
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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151
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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152 int wav_read_data(void* obj, unsigned char* data, unsigned int length) {
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parents:
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153 struct wav_reader* wr = (struct wav_reader*) obj;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
154 int n;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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155 if (wr->wav == NULL)
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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156 return -1;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
157 if (length > wr->data_length)
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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158 length = wr->data_length;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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159 n = fread(data, 1, length, wr->wav);
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
160 wr->data_length -= length;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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161 return n;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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162 }
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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163