static av_cold int g722_decode_init(AVCodecContext * avctx) { G722Context *c = avctx->priv_data; if (avctx->channels != 1) { av_log(avctx, AV_LOG_ERROR, "Only mono tracks are allowed.\n"); return AVERROR_INVALIDDATA; } avctx->sample_fmt = AV_SAMPLE_FMT_S16; c->band[0].scale_factor = 8; c->band[1].scale_factor = 2; c->prev_samples_pos = 22; avcodec_get_frame_defaults(&c->frame); avctx->coded_frame = &c->frame; return 0; }