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| author | Justin Ruggles <justin.ruggles@gmail.com> | 2012-07-09 12:52:30 -0400 |
|---|---|---|
| committer | Justin Ruggles <justin.ruggles@gmail.com> | 2012-07-19 13:26:47 -0400 |
| commit | a4ecd4144265368db7cdb112e098a6ab5142557a (patch) | |
| tree | ad6408647dd163697432c72935a72c483c24652d | |
| parent | f2515cd629d64484be5747639b485ddad9b6bf85 (diff) | |
| download | ffmpeg-a4ecd4144265368db7cdb112e098a6ab5142557a.tar.gz | |
alac: use index into buffer_out instead of incrementing the pointer
| -rw-r--r-- | libavcodec/alac.c | 14 |
1 files changed, 6 insertions, 8 deletions
diff --git a/libavcodec/alac.c b/libavcodec/alac.c index 110d2cbcb1..ba30bef7ea 100644 --- a/libavcodec/alac.c +++ b/libavcodec/alac.c @@ -202,29 +202,29 @@ static void predictor_decompress_fir_adapt(int32_t *error_buffer, /* NOTE: 4 and 8 are very common cases that could be optimized. */ /* general case */ - for (i = predictor_coef_num + 1; i < output_size; i++) { + for (i = predictor_coef_num; i < output_size - 1; i++) { int j; int val = 0; - int error_val = error_buffer[i]; + int error_val = error_buffer[i + 1]; int error_sign; for (j = 0; j < predictor_coef_num; j++) { - val += (buffer_out[predictor_coef_num-j] - buffer_out[0]) * + val += (buffer_out[i - j] - buffer_out[i - predictor_coef_num]) * predictor_coef_table[j]; } val = (val + (1 << (predictor_quantitization - 1))) >> predictor_quantitization; - val += buffer_out[0] + error_val; + val += buffer_out[i - predictor_coef_num] + error_val; - buffer_out[predictor_coef_num + 1] = sign_extend(val, readsamplesize); + buffer_out[i + 1] = sign_extend(val, readsamplesize); /* adapt LPC coefficients */ error_sign = sign_only(error_val); if (error_sign) { for (j = predictor_coef_num - 1; j >= 0 && error_val * error_sign > 0; j--) { int sign; - val = buffer_out[0] - buffer_out[predictor_coef_num - j]; + val = buffer_out[i - predictor_coef_num] - buffer_out[i - j]; sign = sign_only(val) * error_sign; predictor_coef_table[j] -= sign; val *= sign; @@ -232,8 +232,6 @@ static void predictor_decompress_fir_adapt(int32_t *error_buffer, (predictor_coef_num - j)); } } - - buffer_out++; } } |