FreeCalypso > hg > gsm-codec-lib

annotate libtest/wavreader.c @ 282:9ee8ad3d4d30

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frtest: rm gsmfr-hand-test and gsmfr-max-out utils These hack programs were never properly documented and were written only as part of a debug chase, in pursuit of a bug that ultimately turned out to be in our then-hacky patch to osmo-bts-sysmo, before beginning of proper patches in Osmocom. These hack programs need to be dropped from the present sw package because they depend on old libgsm, and we are eliminating that dependency.
author Mychaela Falconia <falcon@freecalypso.org>
date Sun, 14 Apr 2024 05:44:47 +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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parents:
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114 data_pos = ftell(wr->wav);
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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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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Mychaela Falconia <falcon@freecalypso.org>
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117 } else {
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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118 fseek(wr->wav, sublength, SEEK_CUR);
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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119 }
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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120 length -= sublength;
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121 }
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Mychaela Falconia <falcon@freecalypso.org>
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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Mychaela Falconia <falcon@freecalypso.org>
parents:
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124 fseek(wr->wav, length, SEEK_CUR);
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parents:
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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:
diff changeset
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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Mychaela Falconia <falcon@freecalypso.org>
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129 }
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Mychaela Falconia <falcon@freecalypso.org>
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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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Mychaela Falconia <falcon@freecalypso.org>
parents:
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135 }
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
136
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
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:
diff changeset
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:
diff changeset
142 *channels = wr->channels;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
143 if (sample_rate)
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
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:
diff changeset
146 *bits_per_sample = wr->bits_per_sample;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
147 if (data_length)
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
148 *data_length = wr->data_length;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
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;
634df6435e16 libtest: WAV reader and writer code from opencore-amr-0.1.6/test
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
154 int n;
634df6435e16 libtest: WAV reader and writer code from opencore-amr-0.1.6/test
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
155 if (wr->wav == NULL)
634df6435e16 libtest: WAV reader and writer code from opencore-amr-0.1.6/test
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
156 return -1;
634df6435e16 libtest: WAV reader and writer code from opencore-amr-0.1.6/test
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
157 if (length > wr->data_length)
634df6435e16 libtest: WAV reader and writer code from opencore-amr-0.1.6/test
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;
634df6435e16 libtest: WAV reader and writer code from opencore-amr-0.1.6/test
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
161 return n;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
162 }
634df6435e16 libtest: WAV reader and writer code from opencore-amr-0.1.6/test
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
163