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 BLUEKITCHEN 24 * GMBH 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 <fcntl.h> 41 #include <stdio.h> 42 #include <stdlib.h> 43 #include <string.h> 44 45 #include "wav_util.h" 46 #include "btstack_util.h" 47 #include "btstack_debug.h" 48 49 /* wav reader state */ 50 static FILE * wav_reader_file; 51 static int wav_reader_bytes_per_sample = 2; 52 static struct { 53 uint8_t num_channels; 54 uint32_t sampling_rate; 55 } wav_reader_state; 56 57 /* wav writer state */ 58 static struct { 59 FILE * wav_file; 60 int total_num_samples; 61 int num_channels; 62 int sampling_frequency; 63 int frame_count; 64 } wav_writer_state; 65 66 67 static void little_endian_fstore_16(FILE *wav_file, uint16_t value){ 68 uint8_t buf[2]; 69 little_endian_store_16(buf, 0, value); 70 fwrite(&buf, 1, 2, wav_file); 71 } 72 73 static void little_endian_fstore_32(FILE *wav_file, uint32_t value){ 74 uint8_t buf[4]; 75 little_endian_store_32(buf, 0, value); 76 fwrite(&buf, 1, 4, wav_file); 77 } 78 79 static void write_wav_header(FILE * wav_file, int total_num_samples, int num_channels, int sample_rate){ 80 unsigned int write_with_bytes_per_sample = 2; 81 /* write RIFF header */ 82 fwrite("RIFF", 1, 4, wav_file); 83 // num_samples = blocks * subbands 84 uint32_t data_bytes = (uint32_t) (write_with_bytes_per_sample * total_num_samples * num_channels); 85 little_endian_fstore_32(wav_file, data_bytes + 36); 86 fwrite("WAVE", 1, 4, wav_file); 87 88 int byte_rate = sample_rate * num_channels * write_with_bytes_per_sample; 89 int bits_per_sample = 8 * write_with_bytes_per_sample; 90 int block_align = num_channels * bits_per_sample; 91 int fmt_length = 16; 92 int fmt_format_tag = 1; // PCM 93 94 /* write fmt chunk */ 95 fwrite("fmt ", 1, 4, wav_file); 96 little_endian_fstore_32(wav_file, fmt_length); 97 little_endian_fstore_16(wav_file, fmt_format_tag); 98 little_endian_fstore_16(wav_file, num_channels); 99 little_endian_fstore_32(wav_file, sample_rate); 100 little_endian_fstore_32(wav_file, byte_rate); 101 little_endian_fstore_16(wav_file, block_align); 102 little_endian_fstore_16(wav_file, bits_per_sample); 103 104 /* write data chunk */ 105 fwrite("data", 1, 4, wav_file); 106 little_endian_fstore_32(wav_file, data_bytes); 107 } 108 109 int wav_writer_open(const char * filepath, int num_channels, int sampling_frequency){ 110 FILE * wav_file = fopen(filepath, "wb"); 111 if (!wav_file) return 1; 112 113 wav_writer_state.wav_file = wav_file; 114 wav_writer_state.frame_count = 0; 115 wav_writer_state.total_num_samples = 0; 116 wav_writer_state.num_channels = num_channels; 117 wav_writer_state.sampling_frequency = sampling_frequency; 118 write_wav_header(wav_writer_state.wav_file, 0, num_channels, sampling_frequency); 119 return 0; 120 } 121 122 int wav_writer_close(void){ 123 if (wav_writer_state.wav_file == NULL) return 0; 124 rewind(wav_writer_state.wav_file); 125 write_wav_header(wav_writer_state.wav_file, wav_writer_state.total_num_samples, 126 wav_writer_state.num_channels, wav_writer_state.sampling_frequency); 127 fclose(wav_writer_state.wav_file); 128 wav_writer_state.wav_file = NULL; 129 return 0; 130 } 131 132 int wav_writer_write_int8(int num_samples, int8_t * data){ 133 btstack_assert(data != NULL); 134 if (wav_writer_state.wav_file == NULL) return 1; 135 136 int i = 0; 137 int8_t zero_byte = 0; 138 for (i=0; i<num_samples; i++){ 139 fwrite(&zero_byte, 1, 1, wav_writer_state.wav_file); 140 uint8_t byte_value = (uint8_t)data[i]; 141 fwrite(&byte_value, 1, 1, wav_writer_state.wav_file); 142 } 143 144 wav_writer_state.total_num_samples+=num_samples; 145 wav_writer_state.frame_count++; 146 return 0; 147 } 148 149 int wav_writer_write_le_int16(int num_samples, int16_t * data){ 150 btstack_assert(data != NULL); 151 if (wav_writer_state.wav_file == NULL) return 1; 152 153 fwrite(data, num_samples, 2, wav_writer_state.wav_file); 154 155 wav_writer_state.total_num_samples+=num_samples; 156 wav_writer_state.frame_count++; 157 return 0; 158 } 159 160 int wav_writer_write_int16(int num_samples, int16_t * data){ 161 btstack_assert(data != NULL); 162 if (wav_writer_state.wav_file == NULL) return 1; 163 164 if (btstack_is_little_endian()){ 165 return wav_writer_write_le_int16(num_samples, data); 166 } 167 168 int i; 169 for (i=0;i<num_samples;i++){ 170 uint16_t sample = btstack_flip_16(data[i]); 171 fwrite(&sample, 1, 2, wav_writer_state.wav_file); 172 } 173 174 wav_writer_state.total_num_samples+=num_samples; 175 wav_writer_state.frame_count++; 176 return 0; 177 } 178 179 /** WAV Reader Implementation */ 180 181 int wav_reader_open(const char * filepath){ 182 memset (&wav_reader_state, 0, sizeof(wav_reader_state)); 183 wav_reader_file = fopen(filepath, "rb"); 184 if (wav_reader_file == NULL) { 185 log_error("Can't open file %s", filepath); 186 return 1; 187 } 188 189 uint8_t buf[40]; 190 fread(buf, 1, sizeof(buf), wav_reader_file); 191 192 wav_reader_state.num_channels = (uint8_t) little_endian_read_16(buf, 22); 193 if ((wav_reader_state.num_channels < 1) || (wav_reader_state.num_channels > 2)) { 194 log_error("Unexpected num channels %d", wav_reader_state.num_channels); 195 return 1; 196 } 197 198 wav_reader_state.sampling_rate = little_endian_read_32(buf, 24); 199 200 int block_align = little_endian_read_16(buf, 32); 201 wav_reader_bytes_per_sample = block_align / wav_reader_state.num_channels; 202 if (wav_reader_bytes_per_sample > 2){ 203 wav_reader_bytes_per_sample = wav_reader_bytes_per_sample / 8; 204 } 205 206 return 0; 207 } 208 209 uint8_t wav_reader_get_num_channels(void){ 210 return wav_reader_state.num_channels; 211 } 212 213 uint32_t wav_reader_get_sampling_rate(void){ 214 return wav_reader_state.sampling_rate; 215 } 216 217 int wav_reader_close(void){ 218 if (wav_reader_file != NULL){ 219 fclose(wav_reader_file); 220 } 221 return 0; 222 } 223 224 // Wav data: 8bit is uint8_t; 16bit is int16 225 int wav_reader_read_int8(int num_samples, int8_t * data){ 226 if (wav_reader_file == NULL) { 227 return 1; 228 } 229 int i; 230 int bytes_read = 0; 231 232 for (i=0; i<num_samples; i++){ 233 if (wav_reader_bytes_per_sample == 2){ 234 uint8_t buf[2]; 235 bytes_read += (uint16_t) fread(buf, 1, sizeof(buf), wav_reader_file);; 236 data[i] = buf[1]; 237 } else { 238 uint8_t buf[1]; 239 bytes_read += (uint16_t) fread(buf, 1, sizeof(buf), wav_reader_file);; 240 data[i] = buf[0] + 128; 241 } 242 } 243 if (bytes_read == num_samples * wav_reader_bytes_per_sample) { 244 return 0; 245 } else { 246 return 1; 247 } 248 } 249 250 int wav_reader_read_int16(int num_samples, int16_t * data){ 251 if (wav_reader_file == NULL) { 252 return 1; 253 } 254 int i; 255 int bytes_read = 0; 256 for (i=0; i<num_samples; i++){ 257 uint8_t buf[2]; 258 bytes_read += (uint16_t) fread(buf, 1, sizeof(buf), wav_reader_file);; 259 data[i] = little_endian_read_16(buf, 0); 260 } 261 if (bytes_read == num_samples * wav_reader_bytes_per_sample) { 262 return 0; 263 } else { 264 return 1; 265 } 266 } 267 268 269