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wav_util: wav_writer_write_int16 expects samples in host endianess, wav_writer_write_le_int16 expected little endian format

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This commit is contained in:
Matthias Ringwald 2017-01-26 22:00:02 +01:00
parent 5d86890cc5
commit 92abe7b913
2 changed files with 40 additions and 1 deletions
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19
platform/posix/wav_util.c
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@ -153,7 +153,7 @@ int wav_writer_write_int8(int num_samples, int8_t * data){
return 0; return 0;
} }
int wav_writer_write_int16(int num_samples, int16_t * data){ int wav_writer_write_le_int16(int num_samples, int16_t * data){
if (data == NULL) return 1; if (data == NULL) return 1;
fwrite(data, num_samples, 2, wav_writer_state.wav_file); fwrite(data, num_samples, 2, wav_writer_state.wav_file);
@ -162,6 +162,23 @@ int wav_writer_write_int16(int num_samples, int16_t * data){
return 0; return 0;
} }
int wav_writer_write_int16(int num_samples, int16_t * data){
if (btstack_is_little_endian()){
return wav_writer_write_le_int16(num_samples, data);
}
if (data == NULL) return 1;
int i;
for (i=0;i<num_samples;i++){
uint16_t sample = btstack_flip_16(data[i]);
fwrite(&sample, 1, 2, wav_writer_state.wav_file);
}
wav_writer_state.total_num_samples+=num_samples;
wav_writer_state.frame_count++;
return 0;
}
int wav_reader_open(const char * filepath){ int wav_reader_open(const char * filepath){
wav_reader_fd = open(filepath, O_RDONLY); wav_reader_fd = open(filepath, O_RDONLY);
if (!wav_reader_fd) { if (!wav_reader_fd) {

22
platform/posix/wav_util.h
View File

@ -43,9 +43,31 @@
#include <unistd.h> #include <unistd.h>
// return 0 if ok // return 0 if ok
/**
* Write Int16 samples (host endianess)
* @return 0 if ok
*/
int wav_writer_open(const char * filepath, int num_channels, int sampling_frequency); int wav_writer_open(const char * filepath, int num_channels, int sampling_frequency);
/**
* Write Int8 samples
* @return 0 if ok
*/
int wav_writer_write_int8(int num_samples, int8_t * data); int wav_writer_write_int8(int num_samples, int8_t * data);
/**
* Write Int16 samples (host endianess)
* @return 0 if ok
*/
int wav_writer_write_int16(int num_samples, int16_t * data); int wav_writer_write_int16(int num_samples, int16_t * data);
/**
* Write Little Endian Int16 samples
* @return 0 if ok
*/
int wav_writer_write_le_int16(int num_samples, int16_t * data);
/**
* Close wav writer and update wav file header
* @return 0 if ok
*/
int wav_writer_close(void); int wav_writer_close(void);