1 /* 2 * Copyright (C) 2016 BlueKitchen GmbH 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. Neither the name of the copyright holders nor the names of 14 * contributors may be used to endorse or promote products derived 15 * from this software without specific prior written permission. 16 * 4. Any redistribution, use, or modification is done solely for 17 * personal benefit and not for any commercial purpose or for 18 * monetary gain. 19 * 20 * THIS SOFTWARE IS PROVIDED BY BLUEKITCHEN GMBH AND CONTRIBUTORS 21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 22 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 23 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL MATTHIAS 24 * RINGWALD OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 25 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 26 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS 27 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 28 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 29 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF 30 * THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * Please inquire about commercial licensing options at 34 * [email protected] 35 * 36 */ 37 38 #define __BTSTACK_FILE__ "wav_util.c" 39 40 #include <stdint.h> 41 #include <stdio.h> 42 #include <stdlib.h> 43 #include <string.h> 44 #include <fcntl.h> 45 #include <unistd.h> 46 47 #include "wav_util.h" 48 #include "btstack_util.h" 49 #include "btstack_debug.h" 50 51 static int wav_reader_fd; 52 static int bytes_per_sample = 2; 53 54 /* Write wav file utils */ 55 typedef struct wav_writer_state { 56 FILE * wav_file; 57 int total_num_samples; 58 int num_channels; 59 int sampling_frequency; 60 int frame_count; 61 } wav_writer_state_t; 62 63 wav_writer_state_t wav_writer_state; 64 65 66 static void little_endian_fstore_16(FILE *wav_file, uint16_t value){ 67 uint8_t buf[2]; 68 little_endian_store_16(buf, 0, value); 69 fwrite(&buf, 1, 2, wav_file); 70 } 71 72 static void little_endian_fstore_32(FILE *wav_file, uint32_t value){ 73 uint8_t buf[4]; 74 little_endian_store_32(buf, 0, value); 75 fwrite(&buf, 1, 4, wav_file); 76 } 77 78 static ssize_t __read(int fd, void *buf, size_t count){ 79 ssize_t len, pos = 0; 80 81 while (count > 0) { 82 len = read(fd, (int8_t * )buf + pos, count); 83 if (len <= 0) 84 return pos; 85 86 count -= len; 87 pos += len; 88 } 89 return pos; 90 } 91 92 static void write_wav_header(FILE * wav_file, int total_num_samples, int num_channels, int sample_rate){ 93 unsigned int write_with_bytes_per_sample = 2; 94 /* write RIFF header */ 95 fwrite("RIFF", 1, 4, wav_file); 96 // num_samples = blocks * subbands 97 uint32_t data_bytes = (uint32_t) (write_with_bytes_per_sample * total_num_samples * num_channels); 98 little_endian_fstore_32(wav_file, data_bytes + 36); 99 fwrite("WAVE", 1, 4, wav_file); 100 101 int byte_rate = sample_rate * num_channels * write_with_bytes_per_sample; 102 int bits_per_sample = 8 * write_with_bytes_per_sample; 103 int block_align = num_channels * bits_per_sample; 104 int fmt_length = 16; 105 int fmt_format_tag = 1; // PCM 106 107 /* write fmt chunk */ 108 fwrite("fmt ", 1, 4, wav_file); 109 little_endian_fstore_32(wav_file, fmt_length); 110 little_endian_fstore_16(wav_file, fmt_format_tag); 111 little_endian_fstore_16(wav_file, num_channels); 112 little_endian_fstore_32(wav_file, sample_rate); 113 little_endian_fstore_32(wav_file, byte_rate); 114 little_endian_fstore_16(wav_file, block_align); 115 little_endian_fstore_16(wav_file, bits_per_sample); 116 117 /* write data chunk */ 118 fwrite("data", 1, 4, wav_file); 119 little_endian_fstore_32(wav_file, data_bytes); 120 } 121 122 int wav_writer_open(const char * filepath, int num_channels, int sampling_frequency){ 123 FILE * wav_file = fopen(filepath, "wb"); 124 if (!wav_file) return 1; 125 126 wav_writer_state.wav_file = wav_file; 127 wav_writer_state.frame_count = 0; 128 wav_writer_state.total_num_samples = 0; 129 wav_writer_state.num_channels = num_channels; 130 wav_writer_state.sampling_frequency = sampling_frequency; 131 write_wav_header(wav_writer_state.wav_file, 0, num_channels, sampling_frequency); 132 return 0; 133 } 134 135 int wav_writer_close(void){ 136 rewind(wav_writer_state.wav_file); 137 write_wav_header(wav_writer_state.wav_file, wav_writer_state.total_num_samples, 138 wav_writer_state.num_channels, wav_writer_state.sampling_frequency); 139 fclose(wav_writer_state.wav_file); 140 return 0; 141 } 142 143 int wav_writer_write_int8(int num_samples, int8_t * data){ 144 if (data == NULL) return 1; 145 int i = 0; 146 int8_t zero_byte = 0; 147 for (i=0; i<num_samples; i++){ 148 fwrite(&zero_byte, 1, 1, wav_writer_state.wav_file); 149 uint8_t byte_value = (uint8_t)data[i]; 150 fwrite(&byte_value, 1, 1, wav_writer_state.wav_file); 151 } 152 153 wav_writer_state.total_num_samples+=num_samples; 154 wav_writer_state.frame_count++; 155 return 0; 156 } 157 158 int wav_writer_write_le_int16(int num_samples, int16_t * data){ 159 if (data == NULL) return 1; 160 fwrite(data, num_samples, 2, wav_writer_state.wav_file); 161 162 wav_writer_state.total_num_samples+=num_samples; 163 wav_writer_state.frame_count++; 164 return 0; 165 } 166 167 int wav_writer_write_int16(int num_samples, int16_t * data){ 168 if (btstack_is_little_endian()){ 169 return wav_writer_write_le_int16(num_samples, data); 170 } 171 if (data == NULL) return 1; 172 173 int i; 174 for (i=0;i<num_samples;i++){ 175 uint16_t sample = btstack_flip_16(data[i]); 176 fwrite(&sample, 1, 2, wav_writer_state.wav_file); 177 } 178 179 wav_writer_state.total_num_samples+=num_samples; 180 wav_writer_state.frame_count++; 181 return 0; 182 } 183 184 int wav_reader_open(const char * filepath){ 185 wav_reader_fd = open(filepath, O_RDONLY); 186 if (!wav_reader_fd) { 187 log_error("Can't open file %s", filepath); 188 return 1; 189 } 190 191 uint8_t buf[40]; 192 __read(wav_reader_fd, buf, sizeof(buf)); 193 194 int num_channels = little_endian_read_16(buf, 22); 195 int block_align = little_endian_read_16(buf, 32); 196 if (num_channels != 1 && num_channels != 2) { 197 log_error("Unexpected num channels %d", num_channels); 198 return 1; 199 } 200 bytes_per_sample = block_align/num_channels; 201 if (bytes_per_sample > 2){ 202 bytes_per_sample = bytes_per_sample/8; 203 } 204 return 0; 205 } 206 207 int wav_reader_close(void){ 208 close(wav_reader_fd); 209 return 0; 210 } 211 212 // Wav data: 8bit is uint8_t; 16bit is int16 213 int wav_reader_read_int8(int num_samples, int8_t * data){ 214 if (!wav_reader_fd) return 1; 215 int i; 216 int bytes_read = 0; 217 218 for (i=0; i<num_samples; i++){ 219 if (bytes_per_sample == 2){ 220 uint8_t buf[2]; 221 bytes_read +=__read(wav_reader_fd, &buf, 2); 222 data[i] = buf[1]; 223 } else { 224 uint8_t buf[1]; 225 bytes_read +=__read(wav_reader_fd, &buf, 1); 226 data[i] = buf[0] + 128; 227 } 228 } 229 if (bytes_read == num_samples*bytes_per_sample) { 230 return 0; 231 } else { 232 return 1; 233 } 234 } 235 236 int wav_reader_read_int16(int num_samples, int16_t * data){ 237 if (!wav_reader_fd) return 1; 238 int i; 239 int bytes_read = 0; 240 for (i=0; i<num_samples; i++){ 241 uint8_t buf[2]; 242 bytes_read +=__read(wav_reader_fd, &buf, 2); 243 data[i] = little_endian_read_16(buf, 0); 244 } 245 if (bytes_read == num_samples*bytes_per_sample) { 246 return 0; 247 } else { 248 return 1; 249 } 250 } 251 252 253