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Speed up loading of 24/32-bit wav files. #43

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Speed up loading of 24/32-bit wav files. #43

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3691d87
speed up 24/32 bit wav loads
prayerie May 3, 2026
10ccaa5
whoops accidentally removed skip_bytes
prayerie May 3, 2026
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24 changes: 16 additions & 8 deletions libntxm/arm9/source/wav.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -199,16 +199,24 @@ bool Wav::load(const char *filename)
// Read the data
if(bit_per_sample > bit_per_sample_) {
int skip_bytes = (bit_per_sample - bit_per_sample_) / 8;
u32 i = 0;
for(; i < n_samples_; i++) {
fseek(fileh, skip_bytes, SEEK_CUR);
if(fread(audio_data_ + i * 2, 2, 1, fileh) <= 0) {
break;
}
int byte_per_sample = bit_per_sample_/8;

u8 *audio_data_tmp = (u8*)ntxm_umalloc(chunk_size);
if (audio_data_tmp == 0) {
ntxm_dprintf("Could not alloc mem(%ld) for wav.\n", chunk_size);
ntxm_free(audio_data_);
fclose(fileh);
return false;
}
if(i < n_samples_) {
memset(audio_data_ + i * 2, 0, chunk_size - i * 2);
fread(audio_data_tmp, 1, chunk_size, fileh);

u32 i=0;
for(; i < n_samples_; i++) {
memcpy(audio_data_ + i * byte_per_sample, audio_data_tmp + i * byte_per_sample + skip_bytes,
(bit_per_sample_ / 8));
}

ntxm_free(audio_data_tmp);
} else {
size_t bytes_read = fread(audio_data_, 1, chunk_size, fileh);
if (bytes_read < chunk_size) {
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