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Document that and why subtitle decoders do not support direct-rendering.
Originally committed as revision 24177 to svn://svn.ffmpeg.org/ffmpeg/trunk
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@ -3542,6 +3542,10 @@ attribute_deprecated int avcodec_decode_subtitle(AVCodecContext *avctx, AVSubtit
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* Return a negative value on error, otherwise return the number of bytes used.
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* If no subtitle could be decompressed, got_sub_ptr is zero.
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* Otherwise, the subtitle is stored in *sub.
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* Note that CODEC_CAP_DR1 is not available for subtitle codecs. This is for
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* simplicity, because the performance difference is expect to be negligible
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* and reusing a get_buffer written for video codecs would probably perform badly
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* due to a potentially very different allocation pattern.
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*
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* @param avctx the codec context
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* @param[out] sub The AVSubtitle in which the decoded subtitle will be stored.
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