FreeCalypso > hg > gsm-codec-lib
annotate libtest/wavwriter.c @ 162:b98aebd94d1f
gsmefr-dlcap-parse utility written
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Thu, 15 Dec 2022 23:47:12 +0000 |
parents | 634df6435e16 |
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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 |