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<h1>Audio decoding<br>
<small>
[<a class="el" href="group__audio.html">Audio</a>]</small>
</h1>Audio related definitions and functions (reading).
<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">long </td><td class="memItemRight" valign="bottom"><a class="el" href="group__audio__decode.html#g73add06ff6dcf50a806596c6e39fed14">quicktime_audio_length</a> (<a class="el" href="group__general.html#gef65e7300455a3b25eafc7485ec2efa4">quicktime_t</a> *file, int track)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Get the audio length. <a href="#g73add06ff6dcf50a806596c6e39fed14"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">long </td><td class="memItemRight" valign="bottom"><a class="el" href="group__audio__decode.html#gf81ed5f7a3801c1387e389ec2f08ea34">quicktime_audio_position</a> (<a class="el" href="group__general.html#gef65e7300455a3b25eafc7485ec2efa4">quicktime_t</a> *file, int track)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Get the audio position. <a href="#gf81ed5f7a3801c1387e389ec2f08ea34"></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__decode.html#g5e42c53037d62306e27886aa5bd7215f">quicktime_audio_tracks</a> (<a class="el" href="group__general.html#gef65e7300455a3b25eafc7485ec2efa4">quicktime_t</a> *file)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Get the number of audio tracks. <a href="#g5e42c53037d62306e27886aa5bd7215f"></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__decode.html#gd8fab2c601a024a65ce814fbf0d75fe5">quicktime_has_audio</a> (<a class="el" href="group__general.html#gef65e7300455a3b25eafc7485ec2efa4">quicktime_t</a> *file)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Check if a file has at least one audio track. <a href="#gd8fab2c601a024a65ce814fbf0d75fe5"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">long </td><td class="memItemRight" valign="bottom"><a class="el" href="group__audio__decode.html#g3842e80013742ccf947ccdc622b7fc39">quicktime_sample_rate</a> (<a class="el" href="group__general.html#gef65e7300455a3b25eafc7485ec2efa4">quicktime_t</a> *file, int track)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Get the samplerate of an audio track. <a href="#g3842e80013742ccf947ccdc622b7fc39"></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__decode.html#g2f87633dd353e14528542fcbdb91e49c">quicktime_audio_bits</a> (<a class="el" href="group__general.html#gef65e7300455a3b25eafc7485ec2efa4">quicktime_t</a> *file, int track)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Get the bits per sample of an audio track. <a href="#g2f87633dd353e14528542fcbdb91e49c"></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__decode.html#g4a144a36a8c030a95b286b13e0000065">quicktime_track_channels</a> (<a class="el" href="group__general.html#gef65e7300455a3b25eafc7485ec2efa4">quicktime_t</a> *file, int track)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Get the number of channels of an audio track. <a href="#g4a144a36a8c030a95b286b13e0000065"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">char * </td><td class="memItemRight" valign="bottom"><a class="el" href="group__audio__decode.html#gcaa38f0a3b49b86703a98055bd8f14e4">quicktime_audio_compressor</a> (<a class="el" href="group__general.html#gef65e7300455a3b25eafc7485ec2efa4">quicktime_t</a> *file, int track)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Get the four character code of an audio track. <a href="#gcaa38f0a3b49b86703a98055bd8f14e4"></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__decode.html#g1b81bfad233e5147c7072c85b677822b">quicktime_channel_location</a> (<a class="el" href="group__general.html#gef65e7300455a3b25eafc7485ec2efa4">quicktime_t</a> *file, int *quicktime_track, int *quicktime_channel, int channel)</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="group__audio__decode.html#g53a8478f9f132f5c9531e0e9d3a748bb">quicktime_set_audio_position</a> (<a class="el" href="group__general.html#gef65e7300455a3b25eafc7485ec2efa4">quicktime_t</a> *file, int64_t sample, int track)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Seek to a specific audio position. <a href="#g53a8478f9f132f5c9531e0e9d3a748bb"></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__decode.html#g4682b20d2bc8526ee10c30967dcff255">quicktime_supported_audio</a> (<a class="el" href="group__general.html#gef65e7300455a3b25eafc7485ec2efa4">quicktime_t</a> *file, int track)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Check if an audio track is supported by libquicktime. <a href="#g4682b20d2bc8526ee10c30967dcff255"></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__decode.html#g9c930df50ed2c2f037a4c1423a2eb61a">quicktime_decode_audio</a> (<a class="el" href="group__general.html#gef65e7300455a3b25eafc7485ec2efa4">quicktime_t</a> *file, int16_t *output_i, float *output_f, long samples, int channel)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Decode a number of audio samples of a single channel. <a href="#g9c930df50ed2c2f037a4c1423a2eb61a"></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__decode.html#g73483ca19aaadddf7f274806b4eed60e">lqt_decode_audio</a> (<a class="el" href="group__general.html#gef65e7300455a3b25eafc7485ec2efa4">quicktime_t</a> *file, int16_t **output_i, float **output_f, long samples)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Decode all channels from all tracks at once. <a href="#g73483ca19aaadddf7f274806b4eed60e"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">int64_t </td><td class="memItemRight" valign="bottom"><a class="el" href="group__audio__decode.html#gaf762239a7ebae6f9933b2bf28bb8ded">lqt_last_audio_position</a> (<a class="el" href="group__general.html#gef65e7300455a3b25eafc7485ec2efa4">quicktime_t</a> *file, int track)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Get the position of the last decoded sample. <a href="#gaf762239a7ebae6f9933b2bf28bb8ded"></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__decode.html#ge5f1a8c618d48a333b0bcdf4321c42f6">lqt_decode_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">Decode a number of audio samples. <a href="#ge5f1a8c618d48a333b0bcdf4321c42f6"></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__decode.html#g8143c4405296ba9b61ff2ac69722b12b">lqt_decode_audio_raw</a> (<a class="el" href="group__general.html#gef65e7300455a3b25eafc7485ec2efa4">quicktime_t</a> *file, void *output, long samples, int track)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Decode audio in the native sampleformat of the codec. <a href="#g8143c4405296ba9b61ff2ac69722b12b"></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__decode.html#gd8b145454f48ef5ddef2f0651986da5f">lqt_get_audio_language</a> (<a class="el" href="group__general.html#gef65e7300455a3b25eafc7485ec2efa4">quicktime_t</a> *file, int track, char *language)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Get the audio language. <a href="#gd8b145454f48ef5ddef2f0651986da5f"></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__decode.html#g0e3591ef0f39afa72369a79ccdd48278">lqt_total_channels</a> (<a class="el" href="group__general.html#gef65e7300455a3b25eafc7485ec2efa4">quicktime_t</a> *file)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Get the total number of audio channels across all tracks. <a href="#g0e3591ef0f39afa72369a79ccdd48278"></a><br></td></tr>
</table>
<hr><a name="_details"></a><h2>Detailed Description</h2>
Audio related definitions and functions (reading).
<p>
The audio API changed a lot during the last years (causing lot of confusion), so here is the preferred way: First get the number of audio tracks with <a class="el" href="group__audio__decode.html#g5e42c53037d62306e27886aa5bd7215f">quicktime_audio_tracks</a>. Then for each track you want to decode, use <a class="el" href="group__audio__decode.html#g4682b20d2bc8526ee10c30967dcff255">quicktime_supported_audio</a> to verify that a codec is available. Then get the audio format with <a class="el" href="group__audio__decode.html#g4a144a36a8c030a95b286b13e0000065">quicktime_track_channels</a> and <a class="el" href="group__audio__decode.html#g3842e80013742ccf947ccdc622b7fc39">quicktime_sample_rate</a> . Then use <a class="el" href="group__audio__decode.html#ge5f1a8c618d48a333b0bcdf4321c42f6">lqt_decode_audio_track</a> to decode noninterleaved channels in either 16bit integer or floating point [-1.0..1.0] format. This method will convert all internally used formats to the datatypes you want, but won't output the full precision for 24/32 bit formats. If you want 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__decode.html#g8143c4405296ba9b61ff2ac69722b12b">lqt_decode_audio_raw</a> to decode it. <hr><h2>Function Documentation</h2>
<a class="anchor" name="g73add06ff6dcf50a806596c6e39fed14"></a><!-- doxytag: member="quicktime.h::quicktime_audio_length" ref="g73add06ff6dcf50a806596c6e39fed14" args="(quicktime_t *file, int track)" -->
<div class="memitem">
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<table class="memname">
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<td class="memname">long quicktime_audio_length </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>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">int </td>
<td class="paramname"> <em>track</em></td><td> </td>
</tr>
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<td></td>
<td>)</td>
<td></td><td></td><td width="100%"></td>
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<div class="memdoc">
<p>
Get the audio length.
<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>index (starting with 0) </td></tr>
</table>
</dl>
<dl class="return" compact><dt><b>Returns:</b></dt><dd>The total number of uncompressed audio samples in the track </dd></dl>
</div>
</div><p>
<a class="anchor" name="gf81ed5f7a3801c1387e389ec2f08ea34"></a><!-- doxytag: member="quicktime.h::quicktime_audio_position" ref="gf81ed5f7a3801c1387e389ec2f08ea34" args="(quicktime_t *file, int track)" -->
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<td class="memname">long quicktime_audio_position </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>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">int </td>
<td class="paramname"> <em>track</em></td><td> </td>
</tr>
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<td>)</td>
<td></td><td></td><td width="100%"></td>
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<div class="memdoc">
<p>
Get the audio position.
<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>index (starting with 0) </td></tr>
</table>
</dl>
<dl class="return" compact><dt><b>Returns:</b></dt><dd>The number (starting with 0) of the next sample to be decoded. </dd></dl>
</div>
</div><p>
<a class="anchor" name="g5e42c53037d62306e27886aa5bd7215f"></a><!-- doxytag: member="quicktime.h::quicktime_audio_tracks" ref="g5e42c53037d62306e27886aa5bd7215f" args="(quicktime_t *file)" -->
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<td class="memname">int quicktime_audio_tracks </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>
<td> ) </td>
<td width="100%"></td>
</tr>
</table>
</div>
<div class="memdoc">
<p>
Get the number of audio tracks.
<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>
</table>
</dl>
<dl class="return" compact><dt><b>Returns:</b></dt><dd>The number of audio tracks </dd></dl>
</div>
</div><p>
<a class="anchor" name="gd8fab2c601a024a65ce814fbf0d75fe5"></a><!-- doxytag: member="quicktime.h::quicktime_has_audio" ref="gd8fab2c601a024a65ce814fbf0d75fe5" args="(quicktime_t *file)" -->
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<td class="memname">int quicktime_has_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>
<td> ) </td>
<td width="100%"></td>
</tr>
</table>
</div>
<div class="memdoc">
<p>
Check if a file has at least one audio 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>
</table>
</dl>
<dl class="return" compact><dt><b>Returns:</b></dt><dd>1 if the file has audio tracks, 0 else </dd></dl>
</div>
</div><p>
<a class="anchor" name="g3842e80013742ccf947ccdc622b7fc39"></a><!-- doxytag: member="quicktime.h::quicktime_sample_rate" ref="g3842e80013742ccf947ccdc622b7fc39" args="(quicktime_t *file, int track)" -->
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<td class="memname">long quicktime_sample_rate </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><td> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td><td width="100%"></td>
</tr>
</table>
</div>
<div class="memdoc">
<p>
Get the samplerate of an audio 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>track</em> </td><td>index (starting with 0) </td></tr>
</table>
</dl>
<dl class="return" compact><dt><b>Returns:</b></dt><dd>The samplerate in Hz </dd></dl>
</div>
</div><p>
<a class="anchor" name="g2f87633dd353e14528542fcbdb91e49c"></a><!-- doxytag: member="quicktime.h::quicktime_audio_bits" ref="g2f87633dd353e14528542fcbdb91e49c" args="(quicktime_t *file, int track)" -->
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<td class="memname">int quicktime_audio_bits </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><td> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td><td width="100%"></td>
</tr>
</table>
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<div class="memdoc">
<p>
Get the bits per sample of an audio 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>track</em> </td><td>index (starting with 0) </td></tr>
</table>
</dl>
<dl class="return" compact><dt><b>Returns:</b></dt><dd>The bits per sample (typically 16)</dd></dl>
Don't use this function for anything else than for informational purposes. Bits per sample is meaningless for compressed codecs, and sometimes plain wrong even for uncompressed ones.<p>
To get some better informations about the resolution, a codec will deliver, use <a class="el" href="group__audio.html#gbde4021e8da716ad38a91c238aa40df0">lqt_get_sample_format</a>
</div>
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<a class="anchor" name="g4a144a36a8c030a95b286b13e0000065"></a><!-- doxytag: member="quicktime.h::quicktime_track_channels" ref="g4a144a36a8c030a95b286b13e0000065" args="(quicktime_t *file, int track)" -->
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<td class="memname">int quicktime_track_channels </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><td> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td><td width="100%"></td>
</tr>
</table>
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<div class="memdoc">
<p>
Get the number of channels of an audio 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>track</em> </td><td>index (starting with 0) </td></tr>
</table>
</dl>
<dl class="return" compact><dt><b>Returns:</b></dt><dd>The the number of channels </dd></dl>
</div>
</div><p>
<a class="anchor" name="gcaa38f0a3b49b86703a98055bd8f14e4"></a><!-- doxytag: member="quicktime.h::quicktime_audio_compressor" ref="gcaa38f0a3b49b86703a98055bd8f14e4" args="(quicktime_t *file, int track)" -->
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<td class="memname">char* quicktime_audio_compressor </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><td> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td><td width="100%"></td>
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<p>
Get the four character code of an audio 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>track</em> </td><td>index (starting with 0) </td></tr>
</table>
</dl>
<dl class="return" compact><dt><b>Returns:</b></dt><dd>The four character code (fourcc) of the track.</dd></dl>
Note, that this function might return nothing meaningful for AVI files, since AVI doesn't use four character codes for audio streams. To get more save information about the codec responsible for the stream, use <a class="el" href="group__codec__registry.html#g8c72d41f05a9ea5900c2d92639fab107">lqt_audio_codec_from_file</a> .
</div>
</div><p>
<a class="anchor" name="g1b81bfad233e5147c7072c85b677822b"></a><!-- doxytag: member="quicktime.h::quicktime_channel_location" ref="g1b81bfad233e5147c7072c85b677822b" args="(quicktime_t *file, int *quicktime_track, int *quicktime_channel, int channel)" -->
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<td class="memname">int quicktime_channel_location </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>quicktime_track</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">int * </td>
<td class="paramname"> <em>quicktime_channel</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">int </td>
<td class="paramname"> <em>channel</em></td><td> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td><td width="100%"></td>
</tr>
</table>
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<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>quicktime_track</em> </td><td>Returns the index of the quicktime track </td></tr>
<tr><td valign="top"></td><td valign="top"><em>quicktime_channel</em> </td><td>Returns the channel index inside the quicktime track </td></tr>
<tr><td valign="top"></td><td valign="top"><em>channel</em> </td><td>The channel to query</td></tr>
</table>
</dl>
Don't use this function (see <a class="el" href="group__audio__decode.html#g73483ca19aaadddf7f274806b4eed60e">lqt_decode_audio</a> )
</div>
</div><p>
<a class="anchor" name="g53a8478f9f132f5c9531e0e9d3a748bb"></a><!-- doxytag: member="quicktime.h::quicktime_set_audio_position" ref="g53a8478f9f132f5c9531e0e9d3a748bb" args="(quicktime_t *file, int64_t sample, int track)" -->
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<td class="memname">int quicktime_set_audio_position </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">int64_t </td>
<td class="paramname"> <em>sample</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">int </td>
<td class="paramname"> <em>track</em></td><td> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td><td width="100%"></td>
</tr>
</table>
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<p>
Seek to a specific audio position.
<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>sample</em> </td><td>The sample position (starting with 0) </td></tr>
<tr><td valign="top"></td><td valign="top"><em>track</em> </td><td>index (starting with 0)</td></tr>
</table>
</dl>
Use this for seeking. During sequential decode calls, the position will be updated automatically
</div>
</div><p>
<a class="anchor" name="g4682b20d2bc8526ee10c30967dcff255"></a><!-- doxytag: member="quicktime.h::quicktime_supported_audio" ref="g4682b20d2bc8526ee10c30967dcff255" args="(quicktime_t *file, int track)" -->
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<td class="memname">int quicktime_supported_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>track</em></td><td> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td><td width="100%"></td>
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</table>
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<div class="memdoc">
<p>
Check if an audio track is supported by libquicktime.
<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>index (starting with 0) </td></tr>
</table>
</dl>
<dl class="return" compact><dt><b>Returns:</b></dt><dd>1 if a codec for this track is available, 0 else </dd></dl>
</div>
</div><p>
<a class="anchor" name="g9c930df50ed2c2f037a4c1423a2eb61a"></a><!-- doxytag: member="quicktime.h::quicktime_decode_audio" ref="g9c930df50ed2c2f037a4c1423a2eb61a" args="(quicktime_t *file, int16_t *output_i, float *output_f, long samples, int channel)" -->
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<td class="memname">int quicktime_decode_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>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">int16_t * </td>
<td class="paramname"> <em>output_i</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">float * </td>
<td class="paramname"> <em>output_f</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">long </td>
<td class="paramname"> <em>samples</em>, </td>
</tr>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">int </td>
<td class="paramname"> <em>channel</em></td><td> </td>
</tr>
<tr>
<td></td>
<td>)</td>
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<p>
Decode a number of audio samples of a single channel.
<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>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>channel</em> </td><td>Channel to decode</td></tr>
</table>
</dl>
Never use this function: Decoding only one channel at once causes lots of internal overhead if you need all channels anyway. In this case, <a class="el" href="group__audio__decode.html#ge5f1a8c618d48a333b0bcdf4321c42f6">lqt_decode_audio_track</a> is the better choice. Furthermore, you won't be able to decode the full resolution for 24 and 32 bit codecs. To decode the maximum resolution, use <a class="el" href="group__audio__decode.html#g8143c4405296ba9b61ff2ac69722b12b">lqt_decode_audio_raw</a>.<p>
The number of actually decoded samples (and EOF) can be obtained with <a class="el" href="group__audio__decode.html#gaf762239a7ebae6f9933b2bf28bb8ded">lqt_last_audio_position</a>
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</div><p>
<a class="anchor" name="g73483ca19aaadddf7f274806b4eed60e"></a><!-- doxytag: member="lqt.h::lqt_decode_audio" ref="g73483ca19aaadddf7f274806b4eed60e" args="(quicktime_t *file, int16_t **output_i, float **output_f, long samples)" -->
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<td class="memname">int lqt_decode_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>output_i</em>, </td>
</tr>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">float ** </td>
<td class="paramname"> <em>output_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>
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</table>
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<p>
Decode all channels from all tracks at once.
<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>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>How many samples to decode</td></tr>
</table>
</dl>
quicktime4linux hides the concept of multiple audio tracks from the user. The idea was probably to put an arbitrary number of channels into a file regardless of the codec (some codecs don't support more than 2 channels). So in principle, this function does the same as <a class="el" href="group__audio__decode.html#g9c930df50ed2c2f037a4c1423a2eb61a">quicktime_decode_audio</a>, but it grabs all channels at once. Or if you want only some channels you can leave the channels you don't want = NULL in the output array. The output arrays must contain at least lqt_total_channels(file) elements.<p>
Libquicktime supports an arbitrary number of audio tracks, which can even have completely different formats and codecs. Therefore you should always use <a class="el" href="group__audio__decode.html#ge5f1a8c618d48a333b0bcdf4321c42f6">lqt_decode_audio_track</a> or <a class="el" href="group__audio__decode.html#g8143c4405296ba9b61ff2ac69722b12b">lqt_decode_audio_raw</a> to decode audio from a particular track.<p>
The number of actually decoded samples (and EOF) can be obtained with <a class="el" href="group__audio__decode.html#gaf762239a7ebae6f9933b2bf28bb8ded">lqt_last_audio_position</a>
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</div><p>
<a class="anchor" name="gaf762239a7ebae6f9933b2bf28bb8ded"></a><!-- doxytag: member="lqt.h::lqt_last_audio_position" ref="gaf762239a7ebae6f9933b2bf28bb8ded" args="(quicktime_t *file, int track)" -->
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<td class="memname">int64_t lqt_last_audio_position </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><td> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td><td width="100%"></td>
</tr>
</table>
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<div class="memdoc">
<p>
Get the position of the last decoded sample.
<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>index (starting with 0) </td></tr>
</table>
</dl>
<dl class="return" compact><dt><b>Returns:</b></dt><dd>The position of the last decoded sample.</dd></dl>
Returns the position of the last decoded sample. It is updated by the codec in each decode call and resembles the true position of the stream. Therefore, after each decode call, the last position should increment by the number of samples you decoded. If it's smaller, it means, that no more samples are available and that the end of the track is reached.
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<a class="anchor" name="ge5f1a8c618d48a333b0bcdf4321c42f6"></a><!-- doxytag: member="lqt.h::lqt_decode_audio_track" ref="ge5f1a8c618d48a333b0bcdf4321c42f6" args="(quicktime_t *file, int16_t **output_i, float **output_f, long samples, int track)" -->
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<td class="memname">int lqt_decode_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>
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<td class="paramtype">int16_t ** </td>
<td class="paramname"> <em>output_i</em>, </td>
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<td></td>
<td class="paramtype">float ** </td>
<td class="paramname"> <em>output_f</em>, </td>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">long </td>
<td class="paramname"> <em>samples</em>, </td>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">int </td>
<td class="paramname"> <em>track</em></td><td> </td>
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<p>
Decode a number of audio samples.
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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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Decode a number of samples from an audio track. All channels are decoded at once. output_i and output_f point to noninterleaved arrays for each channel. Depending on what you need, set either output_i or output_f to NULL. If you want the full resolution also for 24/32 bits, use <a class="el" href="group__audio__decode.html#g8143c4405296ba9b61ff2ac69722b12b">lqt_decode_audio_raw</a> .<p>
The number of actually decoded samples (and EOF) can be obtained with <a class="el" href="group__audio__decode.html#gaf762239a7ebae6f9933b2bf28bb8ded">lqt_last_audio_position</a>
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<a class="anchor" name="g8143c4405296ba9b61ff2ac69722b12b"></a><!-- doxytag: member="lqt.h::lqt_decode_audio_raw" ref="g8143c4405296ba9b61ff2ac69722b12b" args="(quicktime_t *file, void *output, long samples, int track)" -->
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<td class="memname">int lqt_decode_audio_raw </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>
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<td class="paramtype">void * </td>
<td class="paramname"> <em>output</em>, </td>
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<td></td>
<td class="paramtype">long </td>
<td class="paramname"> <em>samples</em>, </td>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">int </td>
<td class="paramname"> <em>track</em></td><td> </td>
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<td></td>
<td>)</td>
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<p>
Decode audio in the native sampleformat of the codec.
<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>output</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 decode </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 actually decoded samples. 0 means end of track.</dd></dl>
This function bypasses all internal sampleformat conversion and allows full resolution output 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> .<p>
The number of actually decoded samples (and EOF) can be obtained with <a class="el" href="group__audio__decode.html#gaf762239a7ebae6f9933b2bf28bb8ded">lqt_last_audio_position</a>
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<a class="anchor" name="gd8b145454f48ef5ddef2f0651986da5f"></a><!-- doxytag: member="lqt.h::lqt_get_audio_language" ref="gd8b145454f48ef5ddef2f0651986da5f" args="(quicktime_t *file, int track, char *language)" -->
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<td class="memname">int lqt_get_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>
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<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">char * </td>
<td class="paramname"> <em>language</em></td><td> </td>
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<td>)</td>
<td></td><td></td><td width="100%"></td>
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<p>
Get 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>Returns ISO-639 Language code </td></tr>
</table>
</dl>
<dl class="return" compact><dt><b>Returns:</b></dt><dd>1 on success, 0 on error.</dd></dl>
The language code is a 3-character code, English is "eng", Japanese is "jpn".
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<a class="anchor" name="g0e3591ef0f39afa72369a79ccdd48278"></a><!-- doxytag: member="lqt.h::lqt_total_channels" ref="g0e3591ef0f39afa72369a79ccdd48278" args="(quicktime_t *file)" -->
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<td class="memname">int lqt_total_channels </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>
<td> ) </td>
<td width="100%"></td>
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<p>
Get the total number of audio channels across all tracks.
<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>
</table>
</dl>
<dl class="return" compact><dt><b>Returns:</b></dt><dd>The total channel count</dd></dl>
The result of this function is only meaningful in conjunction with <a class="el" href="group__audio__decode.html#g73483ca19aaadddf7f274806b4eed60e">lqt_decode_audio</a> . In the general case, you should expect the audio tracks in the file as completely independent. Use <a class="el" href="group__audio__decode.html#g4a144a36a8c030a95b286b13e0000065">quicktime_track_channels</a> instead.
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</div><p>
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