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if (ret = parse_source_parameters(avctx, gb, source))
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if (ret = av_image_check_size(source->width, source->height, 0, avctx))
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/* [DIRAC_STD] picture_coding_mode shall be 0 for fields and 1 for frames
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* currently only used to signal field coding */
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picture_coding_mode = svq3_get_ue_golomb(gb);