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<h1>Decoding audio data</h1>To decode audio data using libfishsound:.
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To decode audio data using libfishsound:.
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<li>create a FishSound* object with mode FISH_SOUND_DECODE. <a class="el" href="fishsound_8h.html#decddfef35cbbddcc8a76b28c365c527" title="Instantiate a new FishSound* handle.">fish_sound_new()</a> will return a new FishSound* object, initialised for decoding, and the <a class="el" href="structFishSoundInfo.html" title="Info about a particular encoder/decoder instance.">FishSoundInfo</a> structure will be cleared.</li><li>provide a FishSoundDecoded_* callback for libfishsound to call when it has decoded audio.</li><li>(optionally) specify whether you want to receive interleaved or per-channel PCM data, using a <a class="el" href="deprecated_8h.html#8e6b76134675d948015fe4afa3fe4104" title="DEPRECATED FUNCTION.">fish_sound_set_interleave()</a>. The default is for per-channel (non-interleaved) PCM.</li><li>feed encoded audio data to libfishsound via <a class="el" href="decode_8h.html#070a1843d6990a00e2471945d40645c7" title="Decode a block of compressed data.">fish_sound_decode()</a>. libfishsound will decode the audio for you, calling the FishSoundDecoded_* callback you provided earlier each time it has a block of audio ready.</li><li>when finished, call <a class="el" href="fishsound_8h.html#002e2dee1a7f736699dba5bec0a81426" title="Delete a FishSound object.">fish_sound_delete()</a>.</li></ul>
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This procedure is illustrated in src/examples/fishsound-decode.c. Note that this example additionally:<ul>
<li>uses <a href="http://www.annodex.net/software/liboggz/">liboggz</a> to demultiplex audio data from an Ogg encapsulated FLAC, Speex or Vorbis stream. The step of feeding encoded data to libfishsound is done within the OggzReadPacket callback.</li><li>uses <a href="http://www.mega-nerd.com/libsndfile/">libsndfile</a> to write the decoded audio to a WAV file.</li></ul>
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Hence this example code demonstrates all that is needed to decode Ogg FLAC, Speex or Ogg Vorbis files:<p>
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