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Improve silence handling

Copy the previous analysis data instead of flagging as invalid

--- a/src/analysis.c

+++ b/src/analysis.c

@@ -547,7 +547,11 @@

     tonal->mem_fill = 240 + remaining;

     if (is_silence)

     {

-       info->valid = 0;

+       /* On silence, copy the previous analysis. */

+       int prev_pos = tonal->write_pos-2;

+       if (prev_pos < 0)

+          prev_pos += DETECT_SIZE;

+       OPUS_COPY(info, &tonal->info[prev_pos], 1);

        RESTORE_STACK;

        return;

     }