static void write_wav_header(FILE * file, int sample_rate, int num_channels, int num_samples, int bytes_per_sample){
printf("SCO Demo: writing wav header: sample rate %u, num channels %u, duration %u s, bytes per sample %u\n",
sample_rate, num_channels, num_samples / sample_rate / num_channels, bytes_per_sample);
/* write RIFF header */
fwrite("RIFF", 1, 4, file);
// num_samples = blocks * subbands
uint32_t data_bytes = (uint32_t) (bytes_per_sample * num_samples * num_channels);
little_endian_fstore_32(file, data_bytes + 36);
fwrite("WAVE", 1, 4, file);
int byte_rate = sample_rate * num_channels * bytes_per_sample;
int bits_per_sample = 8 * bytes_per_sample;
int block_align = num_channels * bits_per_sample;
int fmt_length = 16;
int fmt_format_tag = 1; // PCM
/* write fmt chunk */
fwrite("fmt ", 1, 4, file);
little_endian_fstore_32(file, fmt_length);
little_endian_fstore_16(file, fmt_format_tag);
little_endian_fstore_16(file, num_channels);
little_endian_fstore_32(file, sample_rate);
little_endian_fstore_32(file, byte_rate);
little_endian_fstore_16(file, block_align);
little_endian_fstore_16(file, bits_per_sample);
/* write data chunk */
fwrite("data", 1, 4, file);
little_endian_fstore_32(file, data_bytes);
}
static void write_wav_header(FILE * wav_file, int total_num_samples, int num_channels, int sample_rate){
unsigned int write_with_bytes_per_sample = 2;
/* write RIFF header */
fwrite("RIFF", 1, 4, wav_file);
// num_samples = blocks * subbands
uint32_t data_bytes = (uint32_t) (write_with_bytes_per_sample * total_num_samples * num_channels);
little_endian_fstore_32(wav_file, data_bytes + 36);
fwrite("WAVE", 1, 4, wav_file);
int byte_rate = sample_rate * num_channels * write_with_bytes_per_sample;
int bits_per_sample = 8 * write_with_bytes_per_sample;
int block_align = num_channels * bits_per_sample;
int fmt_length = 16;
int fmt_format_tag = 1; // PCM
/* write fmt chunk */
fwrite("fmt ", 1, 4, wav_file);
little_endian_fstore_32(wav_file, fmt_length);
little_endian_fstore_16(wav_file, fmt_format_tag);
little_endian_fstore_16(wav_file, num_channels);
little_endian_fstore_32(wav_file, sample_rate);
little_endian_fstore_32(wav_file, byte_rate);
little_endian_fstore_16(wav_file, block_align);
little_endian_fstore_16(wav_file, bits_per_sample);
/* write data chunk */
fwrite("data", 1, 4, wav_file);
little_endian_fstore_32(wav_file, data_bytes);
}