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aacdec_usac: skip coeff decoding if the number to be decoded is 0
Yet another thing not mentioned in the spec.
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@ -572,9 +572,15 @@ static int decode_spectrum_and_dequant_ac(AACDecContext *s, float coef[1024],
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int gb_count;
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GetBitContext gb2;
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ff_aac_ac_init(&ac, gb);
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c = ff_aac_ac_map_process(state, reset, N);
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if (!len) {
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ff_aac_ac_finish(state, 0, N);
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return 0;
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}
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ff_aac_ac_init(&ac, gb);
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/* Backup reader for rolling back by 14 bits at the end */
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gb2 = *gb;
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gb_count = get_bits_count(&gb2);
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