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QA /technical/2008/04/mp3-decoder-libraries-compared/
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Wesley Moore
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2 changed files with 161 additions and 145 deletions
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@ -9,6 +9,7 @@ I did some searching and came up with two other libraries that seemed well suite
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I built the two additional libraries with the default configuration options, except for libmad, which I added the <code>--enable-speed</code> option. With the help of example code I made programs out of each that were comparable to the first version for Core Audio. I.e. MP3 file in, 16-bit Linear PCM audio samples out.
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To provide a benchmark I wrote a script that would run each of the three programs against a source MP3 file. Each program reported the elapsed time (via <a href="http://developer.apple.com/documentation/Darwin/Reference/ManPages/man3/time.3.html">time(3)</a>) and the processor time (via <a href="http://developer.apple.com/documentation/Darwin/Reference/ManPages/man3/clock.3.html">clock(3)</a>) when it finished decoding. The programs were run one after another on the source file 10 times. Their PCM output was written to a new file for each invocation.
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<!--more-->
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<h3>Environment</h3>
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@ -22,180 +23,180 @@ The results of the tests for my sample MP3s is below. The individual times were
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<!-- 1-08 Pushin.mp3 -->
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<table class="left_headers">
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<tr>
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<th>Size</th><td>4,296,251 bytes</td>
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</tr>
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<tr>
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<th>Bitrate</th><td>160 kbps</td>
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</tr>
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<tr>
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<th>Channels</th><td>2 (Joint Stereo)</td>
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</tr>
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<tr>
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<th>Length</th><td>3:34</td>
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</tr>
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<tr>
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<th>Size</th><td>4,296,251 bytes</td>
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</tr>
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<tr>
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<th>Bitrate</th><td>160 kbps</td>
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</tr>
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<tr>
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<th>Channels</th><td>2 (Joint Stereo)</td>
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</tr>
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<tr>
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<th>Length</th><td>3:34</td>
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</tr>
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</table>
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<table class="top_headers">
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<tr>
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<th>Library</th>
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<th>Average Elapsed Time</th>
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<th>Average Processor Time</th>
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<th>Processor Time Std. Deviation</th>
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</tr>
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<tr>
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<td>mpg123</td>
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<td>2.30</td>
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<td>1.71</td>
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<td>0.95</td>
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</tr>
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<tr>
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<td>Core Audio</td>
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<td>4.10</td>
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<td>3.63</td>
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<td>0.27</td>
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</tr>
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<tr>
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<td>mad</td>
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<td>4.80</td>
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<td>4.42</td>
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<td>0.02</td>
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</tr>
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<tr>
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<th>Library</th>
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<th>Average Elapsed Time</th>
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<th>Average Processor Time</th>
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<th>Processor Time Std. Deviation</th>
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</tr>
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<tr>
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<td>mpg123</td>
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<td>2.30</td>
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<td>1.71</td>
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<td>0.95</td>
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</tr>
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<tr>
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<td>Core Audio</td>
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<td>4.10</td>
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<td>3.63</td>
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<td>0.27</td>
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</tr>
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<tr>
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<td>mad</td>
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<td>4.80</td>
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<td>4.42</td>
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<td>0.02</td>
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</tr>
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</table>
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<h4>Medium Mono File</h4>
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<!-- Sensation Black 2007 Warm Up Mix.mp3 -->
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<table class="left_headers">
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<tr>
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<th>Size</th><td>83,091,456 bytes</td>
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</tr>
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<tr>
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<th>Bitrate</th><td>320 kbps</td>
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</tr>
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<tr>
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<th>Channels</th><td>1 (Mono)</td>
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</tr>
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<tr>
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<th>Length</th><td>34:37</td>
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</tr>
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<tr>
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<th>Size</th><td>83,091,456 bytes</td>
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</tr>
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<tr>
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<th>Bitrate</th><td>320 kbps</td>
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</tr>
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<tr>
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<th>Channels</th><td>1 (Mono)</td>
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</tr>
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<tr>
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<th>Length</th><td>34:37</td>
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</tr>
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</table>
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<table class="top_headers">
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<tr>
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<th>Library</th>
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<th>Average Elapsed Time</th>
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<th>Average Processor Time</th>
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<th>Processor Time Std. Deviation</th>
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</tr>
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<tr>
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<td>mpg123</td>
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<td>11.10</td>
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<td>9.40</td>
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<td>0.03</td>
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</tr>
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<tr>
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<td>mad</td>
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<td>26.90</td>
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<td>24.60</td>
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<td>0.03</td>
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</tr>
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<tr>
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<td>Core Audio</td>
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<td>33.60</td>
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<td>30.33</td>
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<td>1.18</td>
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</tr>
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<tr>
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<th>Library</th>
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<th>Average Elapsed Time</th>
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<th>Average Processor Time</th>
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<th>Processor Time Std. Deviation</th>
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</tr>
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<tr>
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<td>mpg123</td>
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<td>11.10</td>
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<td>9.40</td>
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<td>0.03</td>
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</tr>
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<tr>
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<td>mad</td>
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<td>26.90</td>
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<td>24.60</td>
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<td>0.03</td>
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</tr>
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<tr>
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<td>Core Audio</td>
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<td>33.60</td>
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<td>30.33</td>
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<td>1.18</td>
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</tr>
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</table>
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<h4>Large File</h4>
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<!-- 1-01 Clubbers Guide 2007 - CD 1.mp3 -->
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<table class="left_headers">
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<tr>
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<th>Size</th><td>126,083,072 bytes</td>
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</tr>
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<tr>
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<th>Bitrate</th><td>224 kbps</td>
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</tr>
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<tr>
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<th>Channels</th><td>2 (Joint Stereo)</td>
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</tr>
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<tr>
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<th>Length</th><td>1:15:02</td>
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</tr>
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<tr>
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<th>Size</th><td>126,083,072 bytes</td>
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</tr>
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<tr>
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<th>Bitrate</th><td>224 kbps</td>
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</tr>
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<tr>
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<th>Channels</th><td>2 (Joint Stereo)</td>
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</tr>
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<tr>
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<th>Length</th><td>1:15:02</td>
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</tr>
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</table>
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<table class="top_headers">
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<tr>
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<th>Library</th>
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<th>Average Elapsed Time</th>
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<th>Average Processor Time</th>
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<th>Processor Time Std. Deviation</th>
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</tr>
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<tr>
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<td>mpg123</td>
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<td>37.00</td>
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<td>32.21</td>
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<td>0.19</td>
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</tr>
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<tr>
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<td>Core Audio</td>
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<td>84.00</td>
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<td>78.34</td>
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<td>0.34</td>
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</tr>
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<tr>
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<td>mad</td>
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<td>100.10</td>
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<td>94.44</td>
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<td>0.15</td>
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</tr>
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<tr>
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<th>Library</th>
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<th>Average Elapsed Time</th>
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<th>Average Processor Time</th>
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<th>Processor Time Std. Deviation</th>
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</tr>
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<tr>
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<td>mpg123</td>
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<td>37.00</td>
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<td>32.21</td>
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<td>0.19</td>
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</tr>
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<tr>
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<td>Core Audio</td>
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<td>84.00</td>
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<td>78.34</td>
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<td>0.34</td>
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</tr>
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<tr>
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<td>mad</td>
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<td>100.10</td>
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<td>94.44</td>
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<td>0.15</td>
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</tr>
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</table>
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<h4>Large VBR File</h4>
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<!-- 1-01 Clubbers Guide to 2007 (AU Edition).mp3 -->
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<table class="left_headers">
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<tr>
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<th>Size</th><td>123,028,672 bytes</td>
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</tr>
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<tr>
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<th>Bitrate</th><td>210 kbps (VBR)</td>
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</tr>
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<tr>
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<th>Channels</th><td>2 (Joint Stereo)</td>
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</tr>
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<tr>
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<th>Length</th><td>1:17:46</td>
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</tr>
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<tr>
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<th>Size</th><td>123,028,672 bytes</td>
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</tr>
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<tr>
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<th>Bitrate</th><td>210 kbps (VBR)</td>
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</tr>
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<tr>
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<th>Channels</th><td>2 (Joint Stereo)</td>
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</tr>
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<tr>
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<th>Length</th><td>1:17:46</td>
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</tr>
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</table>
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<table class="top_headers">
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<tr>
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<th>Library</th>
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<th>Average Elapsed Time</th>
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<th>Average Processor Time</th>
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<th>Processor Time Std. Deviation</th>
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</tr>
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<tr>
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<td>mpg123</td>
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<td>37.90</td>
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<td>32.96</td>
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<td>0.13</td>
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</tr>
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<tr>
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<td>Core Audio</td>
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<td>86.40</td>
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<td>80.52</td>
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<td>0.18</td>
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</tr>
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<tr>
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<td>mad</td>
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<td>104.30</td>
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<td>98.43</td>
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<td>0.10</td>
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</tr>
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<tr>
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<th>Library</th>
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<th>Average Elapsed Time</th>
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<th>Average Processor Time</th>
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<th>Processor Time Std. Deviation</th>
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</tr>
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<tr>
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<td>mpg123</td>
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<td>37.90</td>
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<td>32.96</td>
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<td>0.13</td>
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</tr>
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<tr>
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<td>Core Audio</td>
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<td>86.40</td>
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<td>80.52</td>
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<td>0.18</td>
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</tr>
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<tr>
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<td>mad</td>
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<td>104.30</td>
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<td>98.43</td>
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<td>0.10</td>
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</tr>
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</table>
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<br />
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@ -330,4 +330,19 @@ ul.inline li:first-child {
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border-top-color: #999;
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width: 10em;
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margin: 0;
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}
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}
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/* Styles for MP3 Decoder post */
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table.left_headers, table.top_headers {
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border: 1px solid #D8D8D8;
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border-collapse: collapse;
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margin: 1em 0;
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}
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table.left_headers td, table.left_headers th,
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table.top_headers td, table.top_headers th {
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border: 1px solid #D8D8D8;
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padding: 0.3em 0.7em 0.3em 0.7em;
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}
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table.left_headers th {
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text-align: right;
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}
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