Dear list,
i'm doing a bit of analisys on flac's source code and i've run into something i
can't quite grasp.
flac version 1.2.1
flaclib C
stream_encoder.c
function "process_subframes_"
line 2999
++++++++++++++++++++++
if(do_mid_side) {
FLAC__ASSERT(encoder->protected_->channels == 2);
for(channel = 0; channel < 2; channel++) {
const unsigned w =
get_wasted_bits_(encoder->private_->integer_signal_mid_side[channel],
encoder->protected_->blocksize);
encoder->private_->subframe_workspace_mid_side[channel][0].wasted_bits =
encoder->private_->subframe_workspace_mid_side[channel][1].wasted_bits = w;
encoder->private_->subframe_bps_mid_side[channel] =
encoder->protected_->bits_per_sample - w + (channel==0? 0:1);
}
}
++++++++++++++++++++++++
In that piece of code the encoder determines how many wasted bits there are in
each channel (mid-side) and calculates effective BPS for each of them. What i
don't understand is why it should add one bit to the BPS of the side channel
"(channel==0? 0:1)", eventhough there is no "correction" to wasted bits. Could
someone shed light on this?
Thank you very much in advance!
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