Finally I think that it's a small upstream bug.

Either in libavcodec 0.5.2

enum CodecType {
    CODEC_TYPE_UNKNOWN = -1,
    CODEC_TYPE_VIDEO,
    CODEC_TYPE_AUDIO,
    CODEC_TYPE_DATA,
    CODEC_TYPE_SUBTITLE,
    CODEC_TYPE_ATTACHMENT,
    CODEC_TYPE_NB
};

or in 0.6

enum AVMediaType {
    AVMEDIA_TYPE_UNKNOWN = -1,
    AVMEDIA_TYPE_VIDEO,
    AVMEDIA_TYPE_AUDIO,
    AVMEDIA_TYPE_DATA,
    AVMEDIA_TYPE_SUBTITLE,
    AVMEDIA_TYPE_ATTACHMENT,
    AVMEDIA_TYPE_NB
};

In order to pass the avcodec_open()'s test of codec_type,
data->codecctx should be manually set to CODEC_TYPE_UNKNOWN or
CODEC_TYPE_AUDIO

--- src/plugins/avcodec/avcodec.c       2010-07-10 21:10:42.045571002 +0800
+++ tmp/avcodec.c       2010-07-10 21:15:58.981589650 +0800
@@ -219,6 +219,7 @@
        data->codecctx->block_align = data->block_align;
        data->codecctx->extradata = data->extradata;
        data->codecctx->extradata_size = data->extradata_size;
+       data->codecctx->codec_type = CODEC_TYPE_AUDIO;

        if (avcodec_open (data->codecctx, codec) < 0) {
                XMMS_DBG ("Opening decoder '%s' failed", codec->name);

After rebuild avcodec plugin normal .tta plays.

But tta segment in .cue does not play right in my box, it plays a few
seconds then stop, then it plays the next file...... Should I open a
new bug report?

21:32:55  INFO: ../src/xmms/xform.c:1476: Successfully setup chain for
'file:///tmp/another.tta?startms=0&stopms=202000' (1410) containing
file:magic:tta:avcodec:segment
21:32:55  INFO: ../src/xmms/xform.c:1476: Successfully setup chain for
'file:///tmp/another.tta?startms=204000&stopms=436000' (1411)
containing file:magic:tta:avcodec:segment
21:32:56  INFO: ../src/xmms/xform.c:1476: Successfully setup chain for
'file:///tmp/another.tta?startms=439000&stopms=641000' (1412)
containing file:magic:tta:avcodec:segment
21:32:57  INFO: ../src/xmms/xform.c:1476: Successfully setup chain for
'file:///tmp/another.tta?startms=644000' (1413) containing
file:magic:tta:avcodec:segment



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