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bridge_softmix.c,channel.c: Minor code simplification and cleanup.

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* Made code easier to follow in bridge_softmix.c:analyse_softmix_stats()
and made some debug messages more helpful.

* Made some debug and warning messages more helpful in
channel.c:set_format().

Review: https://reviewboard.asterisk.org/r/4607/
........

Merged revisions 434617 from http://svn.asterisk.org/svn/asterisk/branches/13


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@434618 65c4cc65-6c06-0410-ace0-fbb531ad65f3
This commit is contained in:
Richard Mudgett
2015-04-10 16:38:58 +00:00
parent 0b805cb875
commit 6f1a7fe05f
2 changed files with 49 additions and 39 deletions
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70
bridges/bridge_softmix.c
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@@ -144,11 +144,11 @@ struct softmix_stats {
unsigned int sample_rates[16];
/*! Each index represents the number of channels using the same index in the sample_rates array. */
unsigned int num_channels[16];
/*! the number of channels above the internal sample rate */
/*! The number of channels above the internal sample rate */
unsigned int num_above_internal_rate;
/*! the number of channels at the internal sample rate */
/*! The number of channels at the internal sample rate */
unsigned int num_at_internal_rate;
/*! the absolute highest sample rate supported by any channel in the bridge */
/*! The absolute highest sample rate preferred by any channel in the bridge */
unsigned int highest_supported_rate;
/*! Is the sample rate locked by the bridge, if so what is that rate.*/
unsigned int locked_rate;
@@ -753,6 +753,7 @@ static void gather_softmix_stats(struct softmix_stats *stats,
stats->num_at_internal_rate++;
}
}
/*!
* \internal
* \brief Analyse mixing statistics and change bridges internal rate
@@ -764,7 +765,9 @@ static void gather_softmix_stats(struct softmix_stats *stats,
static unsigned int analyse_softmix_stats(struct softmix_stats *stats, struct softmix_bridge_data *softmix_data)
{
int i;
/* Re-adjust the internal bridge sample rate if
/*
* Re-adjust the internal bridge sample rate if
* 1. The bridge's internal sample rate is locked in at a sample
* rate other than the current sample rate being used.
* 2. two or more channels support a higher sample rate
@@ -774,9 +777,9 @@ static unsigned int analyse_softmix_stats(struct softmix_stats *stats, struct so
/* if the rate is locked by the bridge, only update it if it differs
* from the current rate we are using. */
if (softmix_data->internal_rate != stats->locked_rate) {
ast_debug(1, "Locking at new rate. Bridge changed from %u to %u.\n",
softmix_data->internal_rate, stats->locked_rate);
softmix_data->internal_rate = stats->locked_rate;
ast_debug(1, "Bridge is locked in at sample rate %u\n",
softmix_data->internal_rate);
return 1;
}
} else if (stats->num_above_internal_rate >= 2) {
@@ -788,42 +791,47 @@ static unsigned int analyse_softmix_stats(struct softmix_stats *stats, struct so
if (stats->num_channels[i]) {
break;
}
/* best_rate starts out being the first sample rate
* greater than the internal sample rate that 2 or
* more channels support. */
if (stats->num_channels[i] >= 2 && (best_index == -1)) {
best_rate = stats->sample_rates[i];
best_index = i;
/* If it has been detected that multiple rates above
* the internal rate are present, compare those rates
* to each other and pick the highest one two or more
* channels support. */
} else if (((best_index != -1) &&
(stats->num_channels[i] >= 2) &&
(stats->sample_rates[best_index] < stats->sample_rates[i]))) {
best_rate = stats->sample_rates[i];
best_index = i;
/* It is possible that multiple channels exist with native sample
* rates above the internal sample rate, but none of those channels
* have the same rate in common. In this case, the lowest sample
* rate among those channels is picked. Over time as additional
* statistic runs are made the internal sample rate number will
* adjust to the most optimal sample rate, but it may take multiple
* iterations. */
if (2 <= stats->num_channels[i]) {
/* Two or more channels support this rate. */
if (best_index == -1
|| stats->sample_rates[best_index] < stats->sample_rates[i]) {
/*
* best_rate starts out being the first sample rate
* greater than the internal sample rate that two or
* more channels support.
*
* or
*
* There are multiple rates above the internal rate
* and this rate is higher than the previous rate two
* or more channels support.
*/
best_rate = stats->sample_rates[i];
best_index = i;
}
} else if (best_index == -1) {
/*
* It is possible that multiple channels exist with native sample
* rates above the internal sample rate, but none of those channels
* have the same rate in common. In this case, the lowest sample
* rate among those channels is picked. Over time as additional
* statistic runs are made the internal sample rate number will
* adjust to the most optimal sample rate, but it may take multiple
* iterations.
*/
best_rate = MIN(best_rate, stats->sample_rates[i]);
}
}
ast_debug(1, "Bridge changed from %u To %u\n",
ast_debug(1, "Multiple above internal rate. Bridge changed from %u to %u.\n",
softmix_data->internal_rate, best_rate);
softmix_data->internal_rate = best_rate;
return 1;
} else if (!stats->num_at_internal_rate && !stats->num_above_internal_rate) {
/* In this case, the highest supported rate is actually lower than the internal rate */
softmix_data->internal_rate = stats->highest_supported_rate;
ast_debug(1, "Bridge changed from %u to %u\n",
ast_debug(1, "All below internal rate. Bridge changed from %u to %u.\n",
softmix_data->internal_rate, stats->highest_supported_rate);
softmix_data->internal_rate = stats->highest_supported_rate;
return 1;
}
return 0;