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Documented silence matching

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pjcreath
2005-11-08 23:21:40 +00:00
parent 8da7896c23
commit 416d729fa5
2 changed files with 278 additions and 38 deletions
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38
lib/paranoia/gap.c
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@@ -1,5 +1,5 @@
/*
$Id: gap.c,v 1.2 2005/11/07 20:06:45 pjcreath Exp $
$Id: gap.c,v 1.3 2005/11/08 23:21:40 pjcreath Exp $
Copyright (C) 2004 Rocky Bernstein <rocky@panix.com>
Copyright (C) 1998 Monty xiphmont@mit.edu
@@ -484,7 +484,29 @@ i_analyze_rift_r(int16_t *A,int16_t *B,
}
/* ??? To be studied. */
/* ===========================================================================
* analyze_rift_silence_f (internal)
*
* This function examines the fragment and root from the rift onward to
* see if they have a rift's worth of silence (or if they end with silence).
* It sets (*matchA) to -1 if A's rift is silence, (*matchB) to -1 if B's
* rift is silence, and sets them to 0 otherwise.
*
* Note that, unlike every other function in cdparanoia, this function
* considers any repeated value to be silence (which, in effect, it is).
* All other functions only consider repeated zeroes to be silence.
*
* ??? Is this function name just a misnomer, as it's really looking for
* repeated garbage?
*
* This function is called by i_stage2_each() if it runs into a trailing rift
* that i_analyze_rift_f couldn't diagnose. This checks for another variant:
* where one vector has silence and the other doesn't. We then assume
* that the silence (and anything following it) is garbage.
*
* Note that while this function checks both A and B for silence, the caller
* assumes that only one or the other has silence.
*/
void
analyze_rift_silence_f(int16_t *A,int16_t *B,long sizeA,long sizeB,
long aoffset, long boffset,
@@ -493,12 +515,18 @@ analyze_rift_silence_f(int16_t *A,int16_t *B,long sizeA,long sizeB,
*matchA=-1;
*matchB=-1;
/* Search for MIN_WORDS_RIFT samples, or to the end of the vector,
* whichever comes first.
*/
sizeA=min(sizeA,aoffset+MIN_WORDS_RIFT);
sizeB=min(sizeB,boffset+MIN_WORDS_RIFT);
aoffset++;
boffset++;
/* Check whether A has only "silence" within the search range. Note
* that "silence" here is a single, repeated value (zero or not).
*/
while(aoffset<sizeA){
if(A[aoffset]!=A[aoffset-1]){
*matchA=0;
@@ -507,6 +535,12 @@ analyze_rift_silence_f(int16_t *A,int16_t *B,long sizeA,long sizeB,
aoffset++;
}
/* Check whether B has only "silence" within the search range. Note
* that "silence" here is a single, repeated value (zero or not).
*
* Also note that while the caller assumes that only matchA or matchB
* is set, we check both vectors here.
*/
while(boffset<sizeB){
if(B[boffset]!=B[boffset-1]){
*matchB=0;