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don't calculate bytes per sample within the loop

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AudioFormat.bits is volatile, and to read it, 3 pointers had to be
deferenced.  Calculate this value once.  This speeds up this function
by 5%.

git-svn-id: https://svn.musicpd.org/mpd/trunk@7325 09075e82-0dd4-0310-85a5-a0d7c8717e4f
This commit is contained in:
Max Kellermann
2008-04-12 04:19:59 +00:00
committed by Eric Wong
parent 96eb0119cc
commit 51e9044098
1 changed files with 2 additions and 1 deletions
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3
src/inputPlugins/flac_plugin.c
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@@ -216,6 +216,7 @@ static FLAC__StreamDecoderWriteStatus flacWrite(const flac_decoder *dec,
FLAC__uint16 u16; FLAC__uint16 u16;
unsigned char *uc; unsigned char *uc;
unsigned int c_samp, c_chan; unsigned int c_samp, c_chan;
const unsigned int bytes_per_sample = (data->dc->audioFormat.bits / 8);
unsigned int i; unsigned int i;
float timeChange; float timeChange;
FLAC__uint64 newPosition = 0; FLAC__uint64 newPosition = 0;
@@ -241,7 +242,7 @@ static FLAC__StreamDecoderWriteStatus flacWrite(const flac_decoder *dec,
c_chan++) { c_chan++) {
u16 = buf[c_chan][c_samp]; u16 = buf[c_chan][c_samp];
uc = (unsigned char *)&u16; uc = (unsigned char *)&u16;
for (i = 0; i < (unsigned)(data->dc->audioFormat.bits / 8); i++) { for (i = 0; i < bytes_per_sample; i++) {
if (data->chunk_length >= FLAC_CHUNK_SIZE) { if (data->chunk_length >= FLAC_CHUNK_SIZE) {
if (flacSendChunk(data) < 0) { if (flacSendChunk(data) < 0) {
return return