天天动听今日升级提醒，发现有一句
“使用新的MP3解码器，性能提升50%”，太惊讶了。
之前版本的MP3解码器使用libmpg123，效果已经是MP3解码器中非常不错的了。
50%的提升，应该不仅仅是优化这么简单，莫非使用的新的MP3解码器？
当前安卓版天天动听是7.3.1 和 上一个稳定版 7.2.1，下载后比较一下。
版本7.2.1仍然还是libmpg123解码器。
[gongyuliang@linux armeabi]$ pwd
/home/gongyuliang/newversion/ttpod_android_v7.2.1/lib/armeabi
[gongyuliang@linux armeabi]$ nm -D libmp3decplugin.so
***************************************
000103c0 T mpg123_add_string
000102e4 T mpg123_add_substring
000104a4 T mpg123_chomp_string
0000eedc T mpg123_clip
0000fc80 T mpg123_close
T mpg123_copy_string
0000ba88 T mpg123_current_decoder
0000ed00 T mpg123_decode
0000eb54 T mpg123_decode_frame
0001b120 T mpg123_decode_frame_32
0000dcb4 T mpg123_decoder
0000bab0 T mpg123_decoders
0000fe54 T mpg123_delete
T mpg123_delete_pars
0000fb7c T mpg123_enc_from_id3
0000a718 T mpg123_encodings
0000a744 T mpg123_encsize
0000e2d0 T mpg123_eq
0000ff28 T mpg123_errcode
0000dbf4 T mpg123_exit
0001b0ec T mpg123_feature
0000ec88 T mpg123_feed
0000f14c T mpg123_feedseek
0001b13c T mpg123_feedseek_32
0000ac28 T mpg123_fmt
0000aae8 T mpg123_fmt_all
0000aa28 T mpg123_fmt_none
0000ae20 T mpg123_fmt_support
0000ade4 T mpg123_format
0000abec T mpg123_format_all
0000aaac T mpg123_format_none
0000af0c T mpg123_format_support
0000e9e4 T mpg123_framebyframe_decode
0001b124 T mpg123_framebyframe_decode_32
0000eae8 T mpg123_framebyframe_next
000091cc T mpg123_framedata
0000a350 T mpg123_framepos
0001b128 T mpg123_framepos_32
000101e0 T mpg123_free_string
0000e3b8 T mpg123_geteq
0000eefc T mpg123_getformat
0000dff8 T mpg123_getpar
0000e1d0 T mpg123_getparam
0000e20c T mpg123_getstate
0000a2a0 T mpg123_getvolume
T mpg123_grow_string
0000fb08 T mpg123_icy
0000fb74 T mpg123_icy2utf8
0000fa78 T mpg123_id3
0000fba0 T mpg123_index
0001b148 T mpg123_index_32
T mpg123_info
0000dbb8 T mpg123_init
000101cc T mpg123_init_string
0000f4d0 T mpg123_length
0001b154 T mpg123_length_32
0000fa50 T mpg123_meta_check
0000fa64 T mpg123_meta_free
0000dca0 T mpg123_new
000088c8 T mpg123_new_pars
0000fe24 T mpg123_open
0001b114 T mpg123_open_32
0000fdf4 T mpg123_open_fd
0001b118 T mpg123_open_fd_32
0000fd80 T mpg123_open_feed
0000fda4 T mpg123_open_handle
0001b11c T mpg123_open_handle_32
0000e9c4 T mpg123_outblock
0000dd88 T mpg123_par
0000df48 T mpg123_param
0000dbf8 T mpg123_parnew
0000fe7c T mpg123_plain_strerror
T mpg123_position
0001b150 T mpg123_position_32
0000a6f0 T mpg123_rates
0000eeb0 T mpg123_read
00008ac8 T mpg123_replace_buffer
0000fd40 T mpg123_replace_reader
0001b15c T mpg123_replace_reader_32
0000fcf0 T mpg123_replace_reader_handle
0001b160 T mpg123_replace_reader_handle_32
T mpg123_reset_eq
T mpg123_resize_string
0000e9bc T mpg123_safe_buffer
0000f698 T mpg123_scan
0000f880 T mpg123_seek
0001b138 T mpg123_seek_32
0000f3c8 T mpg123_seek_frame
0001b140 T mpg123_seek_frame_32
0000f4b0 T mpg123_set_filesize
0001b158 T mpg123_set_filesize_32
0000fc1c T mpg123_set_index
0001b14c T mpg123_set_index_32
T mpg123_set_string
000103ec T mpg123_set_substring
T mpg123_spf
0000ff40 T mpg123_strerror
0001040c T mpg123_strlen
0000bac0 T mpg123_supported_decoders
0000eff4 T mpg123_tell
0001b12c T mpg123_tell_32
0000f120 T mpg123_tell_stream
0001b134 T mpg123_tell_stream_32
0000f0c0 T mpg123_tellframe
0001b130 T mpg123_tellframe_32
0000ef98 T mpg123_timeframe
0001b144 T mpg123_timeframe_32
T mpg123_tpf
0000a230 T mpg123_volume
0000a278 T mpg123_volume_change
***************************************
然而版本7.3.1解码器换成了ttMP3Dec*，具体细节未知，有空去考察一下，有知道的朋友希望能交流一下。
[gongyuliang@linux armeabi]$ pwd /home/gongyuliang/newversion/TTPod-Android-v7..1_H3/lib/armeabi [gongyuliang@linux armeabi]$ nm -D libmp3decplugin.so *************************************** 00003cd0 T ttGetMP3DECAPII 00003f20 T ttMP3DecBits_Crc 0000e07c R ttMP3DecBrTab 00003f00 T ttMP3DecCalcBitsUsed T ttMP3DecDCT32 00003d5c T ttMP3DecGetBits 0000434c T ttMP3DecHeaderDecode 000042ec T ttMP3DecHeaderSync 00003d48 T ttMP3DecInitBits 000072b8 T ttMP3DecLayerI T ttMP3DecLayerII T ttMP3DecLayerIII 0000fef0 R ttMP3DecRqTab 00003e78 T ttMP3DecSkipBits 0000e18c R ttMP3DecSrTab 000040d4 T ttMP3DecStreamInit 00007ffc T ttMP3DecSubbandFrame 00008d2c T ttMP3DecSynthMono 00008f28 T ttMP3DecSynthStereo 000089e0 T ttMP3Decidct9
***************************************