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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<title>libquicktime: Audio encoding</title>
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<h1>Audio encoding<br>
<small>
[<a class="el" href="group__audio.html">Audio</a>]</small>
</h1>Audio related definitions and functions (writing).
<a href="#_details">More...</a><table border="0" cellpadding="0" cellspacing="0">
<tr><td></td></tr>
<tr><td colspan="2"><br><h2>Functions</h2></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="group__audio__encode.html#g6e01657d8c9473793b92464fd85fbb3a">quicktime_set_audio</a> (<a class="el" href="group__general.html#gef65e7300455a3b25eafc7485ec2efa4">quicktime_t</a> *file, int channels, long sample_rate, int bits, char *compressor)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Set up tracks in a new file after opening and before writing. <a href="#g6e01657d8c9473793b92464fd85fbb3a"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="group__audio__encode.html#g2981e8327f2cd3ee0d33d6d255f05f70">quicktime_encode_audio</a> (<a class="el" href="group__general.html#gef65e7300455a3b25eafc7485ec2efa4">quicktime_t</a> *file, int16_t **input_i, float **input_f, long samples)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Encode a number of audio samples for the first track. <a href="#g2981e8327f2cd3ee0d33d6d255f05f70"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="group__audio__encode.html#g757133029c2b0c146df224e9fff17ee7">lqt_set_audio</a> (<a class="el" href="group__general.html#gef65e7300455a3b25eafc7485ec2efa4">quicktime_t</a> *file, int channels, long sample_rate, int bits, <a class="el" href="structlqt__codec__info__t.html">lqt_codec_info_t</a> *codec_info)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Set up audio tracks for encoding. <a href="#g757133029c2b0c146df224e9fff17ee7"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="group__audio__encode.html#g720b4666e645a6223d30ab74e165b2f9">lqt_add_audio_track</a> (<a class="el" href="group__general.html#gef65e7300455a3b25eafc7485ec2efa4">quicktime_t</a> *file, int channels, long sample_rate, int bits, <a class="el" href="structlqt__codec__info__t.html">lqt_codec_info_t</a> *codec_info)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Add an audio tracks for encoding. <a href="#g720b4666e645a6223d30ab74e165b2f9"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">void </td><td class="memItemRight" valign="bottom"><a class="el" href="group__audio__encode.html#gfd0edf4a0d75ac3871dfe40b10ce43d0">lqt_set_audio_language</a> (<a class="el" href="group__general.html#gef65e7300455a3b25eafc7485ec2efa4">quicktime_t</a> *file, int track, const char *language)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Set the audio language. <a href="#gfd0edf4a0d75ac3871dfe40b10ce43d0"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="group__audio__encode.html#g7a53aac2d04ad7714458115f320374cf">lqt_encode_audio_track</a> (<a class="el" href="group__general.html#gef65e7300455a3b25eafc7485ec2efa4">quicktime_t</a> *file, int16_t **output_i, float **output_f, long samples, int track)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Encode a number of audio samples for the first track. <a href="#g7a53aac2d04ad7714458115f320374cf"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="group__audio__encode.html#g440f3f940a6d0ffce972b7d7e57930f4">lqt_encode_audio_raw</a> (<a class="el" href="group__general.html#gef65e7300455a3b25eafc7485ec2efa4">quicktime_t</a> *file, void *input, long samples, int track)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Encode audio in the native sampleformat of the codec. <a href="#g440f3f940a6d0ffce972b7d7e57930f4"></a><br></td></tr>
</table>
<hr><a name="_details"></a><h2>Detailed Description</h2>
Audio related definitions and functions (writing).
<p>
The audio API changed a lot during the last years (causing lot of confusion), so here is the preferred way: Use the <a class="el" href="group__codec__registry.html">Codec registry</a> functions to get all supported audio encoders. Once you found a codec (i.e. a <a class="el" href="structlqt__codec__info__t.html">lqt_codec_info_t</a> ), call <a class="el" href="group__audio__encode.html#g720b4666e645a6223d30ab74e165b2f9">lqt_add_audio_track</a> to add the track to the file. You can repeat this procedure to add as many tracks as you like with different formats and/or codecs.<p>
Next you might want to set some compression parameters. This is done by calling <a class="el" href="group__audio.html#g282a31a22a6819423512b93a0e3595aa">lqt_set_audio_parameter</a>. Supported parameters and valid ranges are in the <a class="el" href="structlqt__codec__info__t.html">lqt_codec_info_t</a>.<p>
For each track, encode noninterleaved samples (either in 16bit integer or floating point [-1.0..1.0] format) with <a class="el" href="group__audio__encode.html#g7a53aac2d04ad7714458115f320374cf">lqt_encode_audio_track</a> . In this case, libquicktime will convert your samples to the format used by the codec. This won't give the full precision when using 24/32 bit formats. If you want to pass the samples as raw as possible (bypassing all internal sample format conversions), use <a class="el" href="group__audio.html#gbde4021e8da716ad38a91c238aa40df0">lqt_get_sample_format</a> to get the sampleformat natively used by the codec and <a class="el" href="group__audio__encode.html#g440f3f940a6d0ffce972b7d7e57930f4">lqt_encode_audio_raw</a> to encode it. <hr><h2>Function Documentation</h2>
<a class="anchor" name="g6e01657d8c9473793b92464fd85fbb3a"></a><!-- doxytag: member="quicktime.h::quicktime_set_audio" ref="g6e01657d8c9473793b92464fd85fbb3a" args="(quicktime_t *file, int channels, long sample_rate, int bits, char *compressor)" -->
<div class="memitem">
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<td class="memname">int quicktime_set_audio </td>
<td>(</td>
<td class="paramtype"><a class="el" href="group__general.html#gef65e7300455a3b25eafc7485ec2efa4">quicktime_t</a> * </td>
<td class="paramname"> <em>file</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">int </td>
<td class="paramname"> <em>channels</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">long </td>
<td class="paramname"> <em>sample_rate</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">int </td>
<td class="paramname"> <em>bits</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">char * </td>
<td class="paramname"> <em>compressor</em></td><td> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td><td width="100%"></td>
</tr>
</table>
</div>
<div class="memdoc">
<p>
Set up tracks in a new file after opening and before writing.
<p>
<dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>file</em> </td><td>A quicktime handle </td></tr>
<tr><td valign="top"></td><td valign="top"><em>channels</em> </td><td>Number of channels </td></tr>
<tr><td valign="top"></td><td valign="top"><em>sample_rate</em> </td><td>Samplerate </td></tr>
<tr><td valign="top"></td><td valign="top"><em>bits</em> </td><td>Bits per sample </td></tr>
<tr><td valign="top"></td><td valign="top"><em>compressor</em> </td><td>Compressor to use</td></tr>
</table>
</dl>
Returns the number of quicktime tracks allocated. Audio is stored two channels per quicktime track.<p>
This function is depracated and should not be used in newly written code. It won't let you add individual tracks with different codecs, samplerates etc. Use <a class="el" href="group__audio__encode.html#g720b4666e645a6223d30ab74e165b2f9">lqt_add_audio_track</a> instread.
</div>
</div><p>
<a class="anchor" name="g2981e8327f2cd3ee0d33d6d255f05f70"></a><!-- doxytag: member="quicktime.h::quicktime_encode_audio" ref="g2981e8327f2cd3ee0d33d6d255f05f70" args="(quicktime_t *file, int16_t **input_i, float **input_f, long samples)" -->
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<td class="memname">int quicktime_encode_audio </td>
<td>(</td>
<td class="paramtype"><a class="el" href="group__general.html#gef65e7300455a3b25eafc7485ec2efa4">quicktime_t</a> * </td>
<td class="paramname"> <em>file</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">int16_t ** </td>
<td class="paramname"> <em>input_i</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">float ** </td>
<td class="paramname"> <em>input_f</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">long </td>
<td class="paramname"> <em>samples</em></td><td> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td><td width="100%"></td>
</tr>
</table>
</div>
<div class="memdoc">
<p>
Encode a number of audio samples for the first track.
<p>
<dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>file</em> </td><td>A quicktime handle </td></tr>
<tr><td valign="top"></td><td valign="top"><em>input_i</em> </td><td>16 bit integer output buffer (or NULL) </td></tr>
<tr><td valign="top"></td><td valign="top"><em>input_f</em> </td><td>floating point output buffer (or NULL) </td></tr>
<tr><td valign="top"></td><td valign="top"><em>samples</em> </td><td>Number of samples to decode</td></tr>
</table>
</dl>
Never use this function: It won't let you encode more than one audio track. To encode audio for multiple tracks, use <a class="el" href="group__audio__encode.html#g7a53aac2d04ad7714458115f320374cf">lqt_encode_audio_track</a> . If you want to pass the full resolution even for 24/32 bit audio, use <a class="el" href="group__audio__encode.html#g440f3f940a6d0ffce972b7d7e57930f4">lqt_encode_audio_raw</a> .
</div>
</div><p>
<a class="anchor" name="g757133029c2b0c146df224e9fff17ee7"></a><!-- doxytag: member="lqt.h::lqt_set_audio" ref="g757133029c2b0c146df224e9fff17ee7" args="(quicktime_t *file, int channels, long sample_rate, int bits, lqt_codec_info_t *codec_info)" -->
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<div class="memproto">
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<td class="memname">int lqt_set_audio </td>
<td>(</td>
<td class="paramtype"><a class="el" href="group__general.html#gef65e7300455a3b25eafc7485ec2efa4">quicktime_t</a> * </td>
<td class="paramname"> <em>file</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">int </td>
<td class="paramname"> <em>channels</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">long </td>
<td class="paramname"> <em>sample_rate</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">int </td>
<td class="paramname"> <em>bits</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="structlqt__codec__info__t.html">lqt_codec_info_t</a> * </td>
<td class="paramname"> <em>codec_info</em></td><td> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td><td width="100%"></td>
</tr>
</table>
</div>
<div class="memdoc">
<p>
Set up audio tracks for encoding.
<p>
<dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>file</em> </td><td>A quicktime handle </td></tr>
<tr><td valign="top"></td><td valign="top"><em>channels</em> </td><td>Number of channels </td></tr>
<tr><td valign="top"></td><td valign="top"><em>sample_rate</em> </td><td>Samplerate </td></tr>
<tr><td valign="top"></td><td valign="top"><em>bits</em> </td><td>Bits per sample (always 16) </td></tr>
<tr><td valign="top"></td><td valign="top"><em>codec_info</em> </td><td>Codec to use (see <a class="el" href="group__codec__registry.html">Codec registry</a> )</td></tr>
</table>
</dl>
This sets one audio track for encoding. Note that the bits argument should always be 16 since it's implicit to the codec in all cases. To add more than one audio track, use <a class="el" href="group__audio__encode.html#g720b4666e645a6223d30ab74e165b2f9">lqt_add_audio_track</a> .
</div>
</div><p>
<a class="anchor" name="g720b4666e645a6223d30ab74e165b2f9"></a><!-- doxytag: member="lqt.h::lqt_add_audio_track" ref="g720b4666e645a6223d30ab74e165b2f9" args="(quicktime_t *file, int channels, long sample_rate, int bits, lqt_codec_info_t *codec_info)" -->
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<td class="memname">int lqt_add_audio_track </td>
<td>(</td>
<td class="paramtype"><a class="el" href="group__general.html#gef65e7300455a3b25eafc7485ec2efa4">quicktime_t</a> * </td>
<td class="paramname"> <em>file</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">int </td>
<td class="paramname"> <em>channels</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">long </td>
<td class="paramname"> <em>sample_rate</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">int </td>
<td class="paramname"> <em>bits</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="structlqt__codec__info__t.html">lqt_codec_info_t</a> * </td>
<td class="paramname"> <em>codec_info</em></td><td> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td><td width="100%"></td>
</tr>
</table>
</div>
<div class="memdoc">
<p>
Add an audio tracks for encoding.
<p>
<dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>file</em> </td><td>A quicktime handle </td></tr>
<tr><td valign="top"></td><td valign="top"><em>channels</em> </td><td>Number of channels </td></tr>
<tr><td valign="top"></td><td valign="top"><em>sample_rate</em> </td><td>Samplerate </td></tr>
<tr><td valign="top"></td><td valign="top"><em>bits</em> </td><td>Bits per sample (always 16) </td></tr>
<tr><td valign="top"></td><td valign="top"><em>codec_info</em> </td><td>Codec to use (see <a class="el" href="group__codec__registry.html">Codec registry</a> )</td></tr>
</table>
</dl>
This sets adds a new audio track for encoding. Note that the bits argument should always be 16 since it's implicit to the codec in all cases. Call this function to subsequently to add as many tracks as you like.
</div>
</div><p>
<a class="anchor" name="gfd0edf4a0d75ac3871dfe40b10ce43d0"></a><!-- doxytag: member="lqt.h::lqt_set_audio_language" ref="gfd0edf4a0d75ac3871dfe40b10ce43d0" args="(quicktime_t *file, int track, const char *language)" -->
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<td class="memname">void lqt_set_audio_language </td>
<td>(</td>
<td class="paramtype"><a class="el" href="group__general.html#gef65e7300455a3b25eafc7485ec2efa4">quicktime_t</a> * </td>
<td class="paramname"> <em>file</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">int </td>
<td class="paramname"> <em>track</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const char * </td>
<td class="paramname"> <em>language</em></td><td> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td><td width="100%"></td>
</tr>
</table>
</div>
<div class="memdoc">
<p>
Set the audio language.
<p>
<dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>file</em> </td><td>A quicktime handle </td></tr>
<tr><td valign="top"></td><td valign="top"><em>track</em> </td><td>Track index (starting with 0) </td></tr>
<tr><td valign="top"></td><td valign="top"><em>language</em> </td><td>ISO-639 Language code</td></tr>
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</dl>
The language code is a 3-character code, English is "eng", Japanese is "jpn".
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<a class="anchor" name="g7a53aac2d04ad7714458115f320374cf"></a><!-- doxytag: member="lqt.h::lqt_encode_audio_track" ref="g7a53aac2d04ad7714458115f320374cf" args="(quicktime_t *file, int16_t **output_i, float **output_f, long samples, int track)" -->
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<td class="memname">int lqt_encode_audio_track </td>
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<td class="paramtype"><a class="el" href="group__general.html#gef65e7300455a3b25eafc7485ec2efa4">quicktime_t</a> * </td>
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<td class="paramtype">long </td>
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Encode a number of audio samples for the first track.
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<dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>file</em> </td><td>A quicktime handle </td></tr>
<tr><td valign="top"></td><td valign="top"><em>output_i</em> </td><td>16 bit integer output buffer (or NULL) </td></tr>
<tr><td valign="top"></td><td valign="top"><em>output_f</em> </td><td>floating point output buffer (or NULL) </td></tr>
<tr><td valign="top"></td><td valign="top"><em>samples</em> </td><td>Number of samples to decode </td></tr>
<tr><td valign="top"></td><td valign="top"><em>track</em> </td><td>index (starting with 0)</td></tr>
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Same as <a class="el" href="group__audio__encode.html#g2981e8327f2cd3ee0d33d6d255f05f70">quicktime_encode_audio</a> but with an additional track argument for encoding files with more than one audio track. If you want to pass the full resolution even for 24/32 bit audio, use <a class="el" href="group__audio__encode.html#g440f3f940a6d0ffce972b7d7e57930f4">lqt_encode_audio_raw</a> .
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<a class="anchor" name="g440f3f940a6d0ffce972b7d7e57930f4"></a><!-- doxytag: member="lqt.h::lqt_encode_audio_raw" ref="g440f3f940a6d0ffce972b7d7e57930f4" args="(quicktime_t *file, void *input, long samples, int track)" -->
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<td class="memname">int lqt_encode_audio_raw </td>
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<td class="paramtype"><a class="el" href="group__general.html#gef65e7300455a3b25eafc7485ec2efa4">quicktime_t</a> * </td>
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<td class="paramtype">int </td>
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Encode audio in the native sampleformat of the codec.
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<dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td valign="top"></td><td valign="top"><em>file</em> </td><td>A quicktime handle </td></tr>
<tr><td valign="top"></td><td valign="top"><em>input</em> </td><td>An array of interleaved samples </td></tr>
<tr><td valign="top"></td><td valign="top"><em>samples</em> </td><td>Number of samples to encode </td></tr>
<tr><td valign="top"></td><td valign="top"><em>track</em> </td><td>Track index (starting with 0) </td></tr>
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<dl class="return" compact><dt><b>Returns:</b></dt><dd>The number of encoded samples or 0 if an error occurred.</dd></dl>
This function bypasses all internal sampleformat conversion and allows full resolution input for up to 32 bit integer and 32 bit float. To check, which dataformat the samples will have, use <a class="el" href="group__audio.html#gbde4021e8da716ad38a91c238aa40df0">lqt_get_sample_format</a> .
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