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Fix issue with diffs being incorrect with extreme values.

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This commit is contained in:
luckytyphlosion 2021-01-05 19:53:41 -05:00
parent 8855623ad0
commit a5f75b4949
1 changed files with 3 additions and 3 deletions
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6
tools/aif2pcm/main.c
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@ -425,6 +425,7 @@ struct Bytes *delta_decompress(struct Bytes *delta, unsigned int expected_length
}
#define U8_TO_S8(value) ((value) < 128 ? (value) : (value) - 256)
#define ABS(value) ((value) >= 0 ? (value) : -(value))
int get_delta_index(uint8_t sample, uint8_t prev_sample)
{
@ -447,9 +448,8 @@ int get_delta_index(uint8_t sample, uint8_t prev_sample)
for (int i = delta_table_start_index; i < delta_table_end_index; i++)
{
uint8_t new_sample = prev_sample + gDeltaEncodingTable[i];
uint8_t sample_diff_1 = (sample - new_sample) & 0xff;
uint8_t sample_diff_2 = (new_sample - sample) & 0xff;
int error = sample_diff_1 < sample_diff_2 ? sample_diff_1 : sample_diff_2;
int new_sample_signed = U8_TO_S8(new_sample);
error = ABS(new_sample_signed - sample_signed);
if (error < best_error)
{