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TW-TS-005 reader: fix maximum line length bug TW-TS-005 section 4.1 states: The maximum allowed length of each line is 80 characters, not including the OS-specific newline encoding. The implementation of this line length limit in the TW-TS-005 hex file reader function in the present suite was wrong, such that lines of the full maximum length could not be read. Fix it. Note that this bug affects comment lines too, not just actual RTP payloads. Neither Annex A nor Annex B features an RTP payload format that goes to the maximum of 40 bytes, but if a comment line goes to the maximum allowed length of 80 characters not including the terminating newline, the bug will be triggered, necessitating the present fix.
author Mychaela Falconia <falcon@freecalypso.org>
date Tue, 25 Feb 2025 07:49:28 +0000
parents 634df6435e16
children
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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