[mod_unimrcp] Allow prosody-rate to be negative
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@ -1312,7 +1312,7 @@ static switch_status_t synth_channel_set_header(speech_channel_t *schannel, int
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break;
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case SYNTHESIZER_HEADER_PROSODY_RATE:
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if (switch_isdigit(*val) || *val == '.') {
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if (switch_isdigit(*val) || *val == '.' || *val == '-') {
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synth_hdr->prosody_param.rate.type = PROSODY_RATE_TYPE_RELATIVE_CHANGE;
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synth_hdr->prosody_param.rate.value.relative = (float) atof(val);
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} else if (!strcasecmp("x-slow", val)) {
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