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annotate libtest/wavwriter.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 "wavwriter.h"
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20 #include <stdio.h>
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21 #include <string.h>
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22 #include <stdlib.h>
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23 #include <stdint.h>
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24
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25 struct wav_writer {
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26 FILE *wav;
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27 int data_length;
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28
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29 int sample_rate;
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30 int bits_per_sample;
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31 int channels;
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32 };
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33
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34 static void write_string(struct wav_writer* ww, const char *str) {
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35 fputc(str[0], ww->wav);
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36 fputc(str[1], ww->wav);
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37 fputc(str[2], ww->wav);
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38 fputc(str[3], ww->wav);
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39 }
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40
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41 static void write_int32(struct wav_writer* ww, int value) {
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42 fputc((value >> 0) & 0xff, ww->wav);
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43 fputc((value >> 8) & 0xff, ww->wav);
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44 fputc((value >> 16) & 0xff, ww->wav);
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45 fputc((value >> 24) & 0xff, ww->wav);
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46 }
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47
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48 static void write_int16(struct wav_writer* ww, int value) {
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49 fputc((value >> 0) & 0xff, ww->wav);
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50 fputc((value >> 8) & 0xff, ww->wav);
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51 }
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52
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53 static void write_header(struct wav_writer* ww, int length) {
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54 int bytes_per_frame, bytes_per_sec;
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55 write_string(ww, "RIFF");
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56 write_int32(ww, 4 + 8 + 16 + 8 + length);
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57 write_string(ww, "WAVE");
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58
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59 write_string(ww, "fmt ");
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60 write_int32(ww, 16);
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61
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62 bytes_per_frame = ww->bits_per_sample/8*ww->channels;
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63 bytes_per_sec = bytes_per_frame*ww->sample_rate;
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64 write_int16(ww, 1); // Format
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65 write_int16(ww, ww->channels); // Channels
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66 write_int32(ww, ww->sample_rate); // Samplerate
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67 write_int32(ww, bytes_per_sec); // Bytes per sec
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68 write_int16(ww, bytes_per_frame); // Bytes per frame
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69 write_int16(ww, ww->bits_per_sample); // Bits per sample
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70
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71 write_string(ww, "data");
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72 write_int32(ww, length);
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73 }
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74
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75 void* wav_write_open(const char *filename, int sample_rate, int bits_per_sample, int channels) {
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76 struct wav_writer* ww = (struct wav_writer*) malloc(sizeof(*ww));
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77 memset(ww, 0, sizeof(*ww));
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78 ww->wav = fopen(filename, "wb");
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79 if (ww->wav == NULL) {
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80 free(ww);
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81 return NULL;
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82 }
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83 ww->data_length = 0;
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84 ww->sample_rate = sample_rate;
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85 ww->bits_per_sample = bits_per_sample;
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86 ww->channels = channels;
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87
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88 write_header(ww, ww->data_length);
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89 return ww;
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90 }
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91
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92 void wav_write_close(void* obj) {
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93 struct wav_writer* ww = (struct wav_writer*) obj;
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94 if (ww->wav == NULL) {
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95 free(ww);
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96 return;
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97 }
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98 fseek(ww->wav, 0, SEEK_SET);
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99 write_header(ww, ww->data_length);
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100 fclose(ww->wav);
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101 free(ww);
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102 }
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103
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104 void wav_write_data(void* obj, const unsigned char* data, int length) {
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105 struct wav_writer* ww = (struct wav_writer*) obj;
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106 if (ww->wav == NULL)
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107 return;
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108 fwrite(data, length, 1, ww->wav);
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109 ww->data_length += length;
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110 }
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111