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annotate libtest/wavreader.c @ 550:de333989a12b

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document gsm[e]fr-decode-tw5[-r] utilities
author Mychaela Falconia <falcon@freecalypso.org>
date Sat, 05 Oct 2024 02:16:48 +0000
parents 634df6435e16
children
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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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Mychaela Falconia <falcon@freecalypso.org>
parents:
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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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parents:
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122 if (length > 0) {
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Mychaela Falconia <falcon@freecalypso.org>
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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Mychaela Falconia <falcon@freecalypso.org>
parents:
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126 }
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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127 fseek(wr->wav, data_pos, SEEK_SET);
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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128 return wr;
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129 }
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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130
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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131 void wav_read_close(void* obj) {
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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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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Mychaela Falconia <falcon@freecalypso.org>
parents:
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136
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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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:
diff changeset
138 struct wav_reader* wr = (struct wav_reader*) obj;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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139 if (format)
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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140 *format = wr->format;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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141 if (channels)
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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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>
parents:
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144 *sample_rate = wr->sample_rate;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
145 if (bits_per_sample)
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Mychaela Falconia <falcon@freecalypso.org>
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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Mychaela Falconia <falcon@freecalypso.org>
parents:
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148 *data_length = wr->data_length;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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149 return wr->format && wr->sample_rate;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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150 }
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
151
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
152 int wav_read_data(void* obj, unsigned char* data, unsigned int length) {
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
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:
diff changeset
155 if (wr->wav == NULL)
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
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:
diff changeset
158 length = wr->data_length;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
159 n = fread(data, 1, length, wr->wav);
634df6435e16 libtest: WAV reader and writer code from opencore-amr-0.1.6/test
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
160 wr->data_length -= length;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
161 return n;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
162 }
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
163