avformat/adxdec: set avctx->channels in adx_read_header
It is used in adx_read_packet, which currently depends on the decoder/parser setting this value between reading the file header and demuxing the first packet. Signed-off-by: NAndreas Cadhalpun <Andreas.Cadhalpun@googlemail.com> Signed-off-by: NMichael Niedermayer <michaelni@gmx.at>
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