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translate: Avoid absolute value on unsigned substraction.

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ast_format_get_sample_rate(.) returns an unsigned type. The difference of a
substraction between two unsigned types does not get implicitly converted to a
signed type. Therefore, using abs(.) did not make sense.

ASTERISK-27549

Change-Id: Ib904d9ee0d46b6fdd1476fbc464fbbf813304017
This commit is contained in:
Alexander Traud
2018-01-05 12:51:47 +01:00
committed by Corey Farrell
parent 637f6216c4
commit b45fb3a6ec
1 changed files with 9 additions and 5 deletions
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14
main/translate.c
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@@ -34,7 +34,6 @@ ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
#include <sys/time.h> #include <sys/time.h>
#include <sys/resource.h> #include <sys/resource.h>
#include <math.h> #include <math.h>
#include <stdlib.h>
#include "asterisk/lock.h" #include "asterisk/lock.h"
#include "asterisk/channel.h" #include "asterisk/channel.h"
@@ -1322,6 +1321,13 @@ void ast_translator_deactivate(struct ast_translator *t)
AST_RWLIST_UNLOCK(&translators); AST_RWLIST_UNLOCK(&translators);
} }
/*! Calculate the absolute difference between sample rate of two formats. */
#define format_sample_rate_absdiff(fmt1, fmt2) ({ \
unsigned int rate1 = ast_format_get_sample_rate(fmt1); \
unsigned int rate2 = ast_format_get_sample_rate(fmt2); \
(rate1 > rate2 ? rate1 - rate2 : rate2 - rate1); \
})
/*! \brief Calculate our best translator source format, given costs, and a desired destination */ /*! \brief Calculate our best translator source format, given costs, and a desired destination */
int ast_translator_best_choice(struct ast_format_cap *dst_cap, int ast_translator_best_choice(struct ast_format_cap *dst_cap,
struct ast_format_cap *src_cap, struct ast_format_cap *src_cap,
@@ -1406,10 +1412,8 @@ int ast_translator_best_choice(struct ast_format_cap *dst_cap,
beststeps = matrix_get(x, y)->multistep; beststeps = matrix_get(x, y)->multistep;
} else if (matrix_get(x, y)->table_cost == besttablecost } else if (matrix_get(x, y)->table_cost == besttablecost
&& matrix_get(x, y)->multistep == beststeps) { && matrix_get(x, y)->multistep == beststeps) {
int gap_selected = abs(ast_format_get_sample_rate(best) unsigned int gap_selected = format_sample_rate_absdiff(best, bestdst);
- ast_format_get_sample_rate(bestdst)); unsigned int gap_current = format_sample_rate_absdiff(src, dst);
int gap_current = abs(ast_format_get_sample_rate(src)
- ast_format_get_sample_rate(dst));
if (gap_current < gap_selected) { if (gap_current < gap_selected) {
/* better than what we have so far */ /* better than what we have so far */