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ffmpeg.wasm-core
Commit 6fd8a28b authored by Justin Ruggles's avatar Justin Ruggles
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alac: adjust conditions for updating entropy decoder history 

avoids some unnecessary arithmetic in certain situations
parent a06fdadd
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libavcodec/alac.c
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...@@ -131,11 +131,11 @@ static void bastardized_rice_decompress(ALACContext *alac, ...@@ -131,11 +131,11 @@ static void bastardized_rice_decompress(ALACContext *alac,
sign_modifier = 0; sign_modifier = 0;
/* now update the history */ /* now update the history */
history += x_modified * rice_history_mult -
((history * rice_history_mult) >> 9);
if (x_modified > 0xffff) if (x_modified > 0xffff)
history = 0xffff; history = 0xffff;
else
history += x_modified * rice_history_mult -
((history * rice_history_mult) >> 9);
/* special case: there may be compressed blocks of 0 */ /* special case: there may be compressed blocks of 0 */
if ((history < 128) && (output_count+1 < output_size)) { if ((history < 128) && (output_count+1 < output_size)) {
......
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