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mp3: don't check dropSamplesAtStart in the loop

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Performance improvement by moving stuff out of a loop: skip part of
the first frame before entering the loop.
This commit is contained in:
Max Kellermann 2008-08-26 08:27:12 +02:00
parent df251a9960
commit d9583aa95b
1 changed files with 14 additions and 7 deletions
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21
src/inputPlugins/mp3_plugin.c
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@ -896,15 +896,24 @@ static int mp3Read(mp3DecodeData * data, struct decoder *decoder,
samplesLeft = (data->synth).pcm.length;
for (i = 0; i < (data->synth).pcm.length; i++) {
if (!data->decodedFirstFrame) {
if (data->dropSamplesAtStart >= samplesLeft) {
i = samplesLeft;
samplesLeft = 0;
} else {
i = data->dropSamplesAtStart;
samplesLeft -= data->dropSamplesAtStart;
}
data->decodedFirstFrame = 1;
} else
i = 0;
for (; i < (data->synth).pcm.length; i++) {
mpd_sint16 *sample;
samplesLeft--;
if (!data->decodedFirstFrame &&
(i < data->dropSamplesAtStart)) {
continue;
} else if (data->dropSamplesAtEnd &&
if (data->dropSamplesAtEnd &&
(data->currentFrame == (data->maxFrames - data->dropFramesAtEnd)) &&
(samplesLeft < data->dropSamplesAtEnd)) {
/* stop decoding, effectively dropping
@ -947,8 +956,6 @@ static int mp3Read(mp3DecodeData * data, struct decoder *decoder,
}
}
data->decodedFirstFrame = 1;
if (decoder_get_command(decoder) == DECODE_COMMAND_SEEK &&
data->inStream->seekable) {
long j = 0;