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<a href="#func-members">Functions</a> </div>
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<div class="title">Helper Functions<div class="ingroups"><a class="el" href="group___p_c_m.html">PCM Interface</a></div></div> </div>
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<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="func-members"></a>
Functions</h2></td></tr>
<tr class="memitem:ga8b88181b11a026da55897a926d56034a"><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="group___p_c_m___helpers.html#ga8b88181b11a026da55897a926d56034a">snd_pcm_format_signed</a> (<a class="el" href="group___p_c_m.html#gaa14b7f26877a812acbb39811364177f8">snd_pcm_format_t</a> <a class="el" href="ump__msg_8h.html#a7864fd50d470f893524181b4a59d9828">format</a>)</td></tr>
<tr class="memdesc:ga8b88181b11a026da55897a926d56034a"><td class="mdescLeft"> </td><td class="mdescRight">Return sign info for a PCM sample linear format. <a href="group___p_c_m___helpers.html#ga8b88181b11a026da55897a926d56034a">More...</a><br /></td></tr>
<tr class="separator:ga8b88181b11a026da55897a926d56034a"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ga8cd4e3ecc963942457e3b1b6f7661a90"><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="group___p_c_m___helpers.html#ga8cd4e3ecc963942457e3b1b6f7661a90">snd_pcm_format_unsigned</a> (<a class="el" href="group___p_c_m.html#gaa14b7f26877a812acbb39811364177f8">snd_pcm_format_t</a> <a class="el" href="ump__msg_8h.html#a7864fd50d470f893524181b4a59d9828">format</a>)</td></tr>
<tr class="memdesc:ga8cd4e3ecc963942457e3b1b6f7661a90"><td class="mdescLeft"> </td><td class="mdescRight">Return sign info for a PCM sample linear format. <a href="group___p_c_m___helpers.html#ga8cd4e3ecc963942457e3b1b6f7661a90">More...</a><br /></td></tr>
<tr class="separator:ga8cd4e3ecc963942457e3b1b6f7661a90"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ga5a52bb63323f463198dea3f3c6aca571"><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="group___p_c_m___helpers.html#ga5a52bb63323f463198dea3f3c6aca571">snd_pcm_format_linear</a> (<a class="el" href="group___p_c_m.html#gaa14b7f26877a812acbb39811364177f8">snd_pcm_format_t</a> <a class="el" href="ump__msg_8h.html#a7864fd50d470f893524181b4a59d9828">format</a>)</td></tr>
<tr class="memdesc:ga5a52bb63323f463198dea3f3c6aca571"><td class="mdescLeft"> </td><td class="mdescRight">Return linear info for a PCM sample format. <a href="group___p_c_m___helpers.html#ga5a52bb63323f463198dea3f3c6aca571">More...</a><br /></td></tr>
<tr class="separator:ga5a52bb63323f463198dea3f3c6aca571"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ga36ae70bef5bfd5e7ecc743f6a4d46cb5"><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="group___p_c_m___helpers.html#ga36ae70bef5bfd5e7ecc743f6a4d46cb5">snd_pcm_format_float</a> (<a class="el" href="group___p_c_m.html#gaa14b7f26877a812acbb39811364177f8">snd_pcm_format_t</a> <a class="el" href="ump__msg_8h.html#a7864fd50d470f893524181b4a59d9828">format</a>)</td></tr>
<tr class="memdesc:ga36ae70bef5bfd5e7ecc743f6a4d46cb5"><td class="mdescLeft"> </td><td class="mdescRight">Return float info for a PCM sample format. <a href="group___p_c_m___helpers.html#ga36ae70bef5bfd5e7ecc743f6a4d46cb5">More...</a><br /></td></tr>
<tr class="separator:ga36ae70bef5bfd5e7ecc743f6a4d46cb5"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ga89537d0a972fa124051f6ba1a78c4bfa"><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="group___p_c_m___helpers.html#ga89537d0a972fa124051f6ba1a78c4bfa">snd_pcm_format_little_endian</a> (<a class="el" href="group___p_c_m.html#gaa14b7f26877a812acbb39811364177f8">snd_pcm_format_t</a> <a class="el" href="ump__msg_8h.html#a7864fd50d470f893524181b4a59d9828">format</a>)</td></tr>
<tr class="memdesc:ga89537d0a972fa124051f6ba1a78c4bfa"><td class="mdescLeft"> </td><td class="mdescRight">Return endian info for a PCM sample format. <a href="group___p_c_m___helpers.html#ga89537d0a972fa124051f6ba1a78c4bfa">More...</a><br /></td></tr>
<tr class="separator:ga89537d0a972fa124051f6ba1a78c4bfa"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ga3c0c224b8f67e73cf2447bee0110f760"><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="group___p_c_m___helpers.html#ga3c0c224b8f67e73cf2447bee0110f760">snd_pcm_format_big_endian</a> (<a class="el" href="group___p_c_m.html#gaa14b7f26877a812acbb39811364177f8">snd_pcm_format_t</a> <a class="el" href="ump__msg_8h.html#a7864fd50d470f893524181b4a59d9828">format</a>)</td></tr>
<tr class="memdesc:ga3c0c224b8f67e73cf2447bee0110f760"><td class="mdescLeft"> </td><td class="mdescRight">Return endian info for a PCM sample format. <a href="group___p_c_m___helpers.html#ga3c0c224b8f67e73cf2447bee0110f760">More...</a><br /></td></tr>
<tr class="separator:ga3c0c224b8f67e73cf2447bee0110f760"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:gaf950358cdbb26bab53f63f28443bd2ef"><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="group___p_c_m___helpers.html#gaf950358cdbb26bab53f63f28443bd2ef">snd_pcm_format_cpu_endian</a> (<a class="el" href="group___p_c_m.html#gaa14b7f26877a812acbb39811364177f8">snd_pcm_format_t</a> <a class="el" href="ump__msg_8h.html#a7864fd50d470f893524181b4a59d9828">format</a>)</td></tr>
<tr class="memdesc:gaf950358cdbb26bab53f63f28443bd2ef"><td class="mdescLeft"> </td><td class="mdescRight">Return endian info for a PCM sample format. <a href="group___p_c_m___helpers.html#gaf950358cdbb26bab53f63f28443bd2ef">More...</a><br /></td></tr>
<tr class="separator:gaf950358cdbb26bab53f63f28443bd2ef"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ga8d4e07f2d68cc16f607857ed8a222a29"><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="group___p_c_m___helpers.html#ga8d4e07f2d68cc16f607857ed8a222a29">snd_pcm_format_width</a> (<a class="el" href="group___p_c_m.html#gaa14b7f26877a812acbb39811364177f8">snd_pcm_format_t</a> <a class="el" href="ump__msg_8h.html#a7864fd50d470f893524181b4a59d9828">format</a>)</td></tr>
<tr class="memdesc:ga8d4e07f2d68cc16f607857ed8a222a29"><td class="mdescLeft"> </td><td class="mdescRight">Return the bit-width of the format. <a href="group___p_c_m___helpers.html#ga8d4e07f2d68cc16f607857ed8a222a29">More...</a><br /></td></tr>
<tr class="separator:ga8d4e07f2d68cc16f607857ed8a222a29"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:gaa3e0ff7560342e5af2b5c7bd2d63a307"><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="group___p_c_m___helpers.html#gaa3e0ff7560342e5af2b5c7bd2d63a307">snd_pcm_format_physical_width</a> (<a class="el" href="group___p_c_m.html#gaa14b7f26877a812acbb39811364177f8">snd_pcm_format_t</a> <a class="el" href="ump__msg_8h.html#a7864fd50d470f893524181b4a59d9828">format</a>)</td></tr>
<tr class="memdesc:gaa3e0ff7560342e5af2b5c7bd2d63a307"><td class="mdescLeft"> </td><td class="mdescRight">Return the physical bit-width of the format (bits needed to store a PCM sample) <a href="group___p_c_m___helpers.html#gaa3e0ff7560342e5af2b5c7bd2d63a307">More...</a><br /></td></tr>
<tr class="separator:gaa3e0ff7560342e5af2b5c7bd2d63a307"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ga5f5ab1ac13de9598cf05877e4894e0d8"><td class="memItemLeft" align="right" valign="top"><a class="el" href="group___p_c_m.html#gaa14b7f26877a812acbb39811364177f8">snd_pcm_format_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="group___p_c_m___helpers.html#ga5f5ab1ac13de9598cf05877e4894e0d8">snd_pcm_build_linear_format</a> (int width, int pwidth, int unsignd, int big_endian)</td></tr>
<tr class="memdesc:ga5f5ab1ac13de9598cf05877e4894e0d8"><td class="mdescLeft"> </td><td class="mdescRight">Compose a PCM sample linear format. <a href="group___p_c_m___helpers.html#ga5f5ab1ac13de9598cf05877e4894e0d8">More...</a><br /></td></tr>
<tr class="separator:ga5f5ab1ac13de9598cf05877e4894e0d8"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ga5953a58f024f8cf762a9e4dae6b09502"><td class="memItemLeft" align="right" valign="top">ssize_t </td><td class="memItemRight" valign="bottom"><a class="el" href="group___p_c_m___helpers.html#ga5953a58f024f8cf762a9e4dae6b09502">snd_pcm_format_size</a> (<a class="el" href="group___p_c_m.html#gaa14b7f26877a812acbb39811364177f8">snd_pcm_format_t</a> <a class="el" href="ump__msg_8h.html#a7864fd50d470f893524181b4a59d9828">format</a>, size_t samples)</td></tr>
<tr class="memdesc:ga5953a58f024f8cf762a9e4dae6b09502"><td class="mdescLeft"> </td><td class="mdescRight">Return bytes needed to store a quantity of PCM sample. <a href="group___p_c_m___helpers.html#ga5953a58f024f8cf762a9e4dae6b09502">More...</a><br /></td></tr>
<tr class="separator:ga5953a58f024f8cf762a9e4dae6b09502"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:gaba8e5060f74a9d91df8ea550bf8907fc"><td class="memItemLeft" align="right" valign="top">uint8_t </td><td class="memItemRight" valign="bottom"><a class="el" href="group___p_c_m___helpers.html#gaba8e5060f74a9d91df8ea550bf8907fc">snd_pcm_format_silence</a> (<a class="el" href="group___p_c_m.html#gaa14b7f26877a812acbb39811364177f8">snd_pcm_format_t</a> <a class="el" href="ump__msg_8h.html#a7864fd50d470f893524181b4a59d9828">format</a>)</td></tr>
<tr class="memdesc:gaba8e5060f74a9d91df8ea550bf8907fc"><td class="mdescLeft"> </td><td class="mdescRight">Return 8 bit expressing silence for a PCM sample format. <a href="group___p_c_m___helpers.html#gaba8e5060f74a9d91df8ea550bf8907fc">More...</a><br /></td></tr>
<tr class="separator:gaba8e5060f74a9d91df8ea550bf8907fc"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:gad5c4439da2367885c2a237ddf5aa1254"><td class="memItemLeft" align="right" valign="top">uint16_t </td><td class="memItemRight" valign="bottom"><a class="el" href="group___p_c_m___helpers.html#gad5c4439da2367885c2a237ddf5aa1254">snd_pcm_format_silence_16</a> (<a class="el" href="group___p_c_m.html#gaa14b7f26877a812acbb39811364177f8">snd_pcm_format_t</a> <a class="el" href="ump__msg_8h.html#a7864fd50d470f893524181b4a59d9828">format</a>)</td></tr>
<tr class="memdesc:gad5c4439da2367885c2a237ddf5aa1254"><td class="mdescLeft"> </td><td class="mdescRight">Return 16 bit expressing silence for a PCM sample format. <a href="group___p_c_m___helpers.html#gad5c4439da2367885c2a237ddf5aa1254">More...</a><br /></td></tr>
<tr class="separator:gad5c4439da2367885c2a237ddf5aa1254"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ga78c61e7eef7a20b24cf03fd2a664503e"><td class="memItemLeft" align="right" valign="top">uint32_t </td><td class="memItemRight" valign="bottom"><a class="el" href="group___p_c_m___helpers.html#ga78c61e7eef7a20b24cf03fd2a664503e">snd_pcm_format_silence_32</a> (<a class="el" href="group___p_c_m.html#gaa14b7f26877a812acbb39811364177f8">snd_pcm_format_t</a> <a class="el" href="ump__msg_8h.html#a7864fd50d470f893524181b4a59d9828">format</a>)</td></tr>
<tr class="memdesc:ga78c61e7eef7a20b24cf03fd2a664503e"><td class="mdescLeft"> </td><td class="mdescRight">Return 32 bit expressing silence for a PCM sample format. <a href="group___p_c_m___helpers.html#ga78c61e7eef7a20b24cf03fd2a664503e">More...</a><br /></td></tr>
<tr class="separator:ga78c61e7eef7a20b24cf03fd2a664503e"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ga2006cffa80cc83b99f6f33547be18f35"><td class="memItemLeft" align="right" valign="top">uint64_t </td><td class="memItemRight" valign="bottom"><a class="el" href="group___p_c_m___helpers.html#ga2006cffa80cc83b99f6f33547be18f35">snd_pcm_format_silence_64</a> (<a class="el" href="group___p_c_m.html#gaa14b7f26877a812acbb39811364177f8">snd_pcm_format_t</a> <a class="el" href="ump__msg_8h.html#a7864fd50d470f893524181b4a59d9828">format</a>)</td></tr>
<tr class="memdesc:ga2006cffa80cc83b99f6f33547be18f35"><td class="mdescLeft"> </td><td class="mdescRight">Return 64 bit expressing silence for a PCM sample format. <a href="group___p_c_m___helpers.html#ga2006cffa80cc83b99f6f33547be18f35">More...</a><br /></td></tr>
<tr class="separator:ga2006cffa80cc83b99f6f33547be18f35"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ga82631361cf1c1d13af207beb59cf97ac"><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="group___p_c_m___helpers.html#ga82631361cf1c1d13af207beb59cf97ac">snd_pcm_format_set_silence</a> (<a class="el" href="group___p_c_m.html#gaa14b7f26877a812acbb39811364177f8">snd_pcm_format_t</a> <a class="el" href="ump__msg_8h.html#a7864fd50d470f893524181b4a59d9828">format</a>, void *buf, unsigned int samples)</td></tr>
<tr class="memdesc:ga82631361cf1c1d13af207beb59cf97ac"><td class="mdescLeft"> </td><td class="mdescRight">Silence a PCM samples buffer. <a href="group___p_c_m___helpers.html#ga82631361cf1c1d13af207beb59cf97ac">More...</a><br /></td></tr>
<tr class="separator:ga82631361cf1c1d13af207beb59cf97ac"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:gaf42fb6af35d3d85006c1dea2e11b3e54"><td class="memItemLeft" align="right" valign="top"><a class="el" href="group___p_c_m.html#ga71cdfa37e258d2210b8bd0216bf0c36c">snd_pcm_sframes_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="group___p_c_m___helpers.html#gaf42fb6af35d3d85006c1dea2e11b3e54">snd_pcm_bytes_to_frames</a> (<a class="el" href="group___p_c_m.html#ga919e634deecd855b6e2e15174e70d3ea">snd_pcm_t</a> *pcm, ssize_t bytes)</td></tr>
<tr class="memdesc:gaf42fb6af35d3d85006c1dea2e11b3e54"><td class="mdescLeft"> </td><td class="mdescRight">Convert bytes in frames for a PCM. <a href="group___p_c_m___helpers.html#gaf42fb6af35d3d85006c1dea2e11b3e54">More...</a><br /></td></tr>
<tr class="separator:gaf42fb6af35d3d85006c1dea2e11b3e54"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:gac05ac2b7c6e25986a71792392ff90b83"><td class="memItemLeft" align="right" valign="top">ssize_t </td><td class="memItemRight" valign="bottom"><a class="el" href="group___p_c_m___helpers.html#gac05ac2b7c6e25986a71792392ff90b83">snd_pcm_frames_to_bytes</a> (<a class="el" href="group___p_c_m.html#ga919e634deecd855b6e2e15174e70d3ea">snd_pcm_t</a> *pcm, <a class="el" href="group___p_c_m.html#ga71cdfa37e258d2210b8bd0216bf0c36c">snd_pcm_sframes_t</a> frames)</td></tr>
<tr class="memdesc:gac05ac2b7c6e25986a71792392ff90b83"><td class="mdescLeft"> </td><td class="mdescRight">Convert frames in bytes for a PCM. <a href="group___p_c_m___helpers.html#gac05ac2b7c6e25986a71792392ff90b83">More...</a><br /></td></tr>
<tr class="separator:gac05ac2b7c6e25986a71792392ff90b83"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:gaeed610ddb01120b01b5a2e5cc59aa35b"><td class="memItemLeft" align="right" valign="top">long </td><td class="memItemRight" valign="bottom"><a class="el" href="group___p_c_m___helpers.html#gaeed610ddb01120b01b5a2e5cc59aa35b">snd_pcm_bytes_to_samples</a> (<a class="el" href="group___p_c_m.html#ga919e634deecd855b6e2e15174e70d3ea">snd_pcm_t</a> *pcm, ssize_t bytes)</td></tr>
<tr class="memdesc:gaeed610ddb01120b01b5a2e5cc59aa35b"><td class="mdescLeft"> </td><td class="mdescRight">Convert bytes in samples for a PCM. <a href="group___p_c_m___helpers.html#gaeed610ddb01120b01b5a2e5cc59aa35b">More...</a><br /></td></tr>
<tr class="separator:gaeed610ddb01120b01b5a2e5cc59aa35b"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:gae3669a4326ce185f4261d7bf96900f3f"><td class="memItemLeft" align="right" valign="top">ssize_t </td><td class="memItemRight" valign="bottom"><a class="el" href="group___p_c_m___helpers.html#gae3669a4326ce185f4261d7bf96900f3f">snd_pcm_samples_to_bytes</a> (<a class="el" href="group___p_c_m.html#ga919e634deecd855b6e2e15174e70d3ea">snd_pcm_t</a> *pcm, long samples)</td></tr>
<tr class="memdesc:gae3669a4326ce185f4261d7bf96900f3f"><td class="mdescLeft"> </td><td class="mdescRight">Convert samples in bytes for a PCM. <a href="group___p_c_m___helpers.html#gae3669a4326ce185f4261d7bf96900f3f">More...</a><br /></td></tr>
<tr class="separator:gae3669a4326ce185f4261d7bf96900f3f"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ga23e03a8b127764fff669240986b96b39"><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="group___p_c_m___helpers.html#ga23e03a8b127764fff669240986b96b39">snd_pcm_area_silence</a> (const <a class="el" href="structsnd__pcm__channel__area__t.html">snd_pcm_channel_area_t</a> *dst_channel, <a class="el" href="group___p_c_m.html#gab01fcfe9b97382a8d3f2027c664b8b8a">snd_pcm_uframes_t</a> dst_offset, unsigned int samples, <a class="el" href="group___p_c_m.html#gaa14b7f26877a812acbb39811364177f8">snd_pcm_format_t</a> <a class="el" href="ump__msg_8h.html#a7864fd50d470f893524181b4a59d9828">format</a>)</td></tr>
<tr class="memdesc:ga23e03a8b127764fff669240986b96b39"><td class="mdescLeft"> </td><td class="mdescRight">Silence an area. <a href="group___p_c_m___helpers.html#ga23e03a8b127764fff669240986b96b39">More...</a><br /></td></tr>
<tr class="separator:ga23e03a8b127764fff669240986b96b39"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ga1c0aab2a2bb341f1b1d154dae2b7e482"><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="group___p_c_m___helpers.html#ga1c0aab2a2bb341f1b1d154dae2b7e482">snd_pcm_areas_silence</a> (const <a class="el" href="structsnd__pcm__channel__area__t.html">snd_pcm_channel_area_t</a> *dst_channels, <a class="el" href="group___p_c_m.html#gab01fcfe9b97382a8d3f2027c664b8b8a">snd_pcm_uframes_t</a> dst_offset, unsigned int channels, <a class="el" href="group___p_c_m.html#gab01fcfe9b97382a8d3f2027c664b8b8a">snd_pcm_uframes_t</a> frames, <a class="el" href="group___p_c_m.html#gaa14b7f26877a812acbb39811364177f8">snd_pcm_format_t</a> <a class="el" href="ump__msg_8h.html#a7864fd50d470f893524181b4a59d9828">format</a>)</td></tr>
<tr class="memdesc:ga1c0aab2a2bb341f1b1d154dae2b7e482"><td class="mdescLeft"> </td><td class="mdescRight">Silence one or more areas. <a href="group___p_c_m___helpers.html#ga1c0aab2a2bb341f1b1d154dae2b7e482">More...</a><br /></td></tr>
<tr class="separator:ga1c0aab2a2bb341f1b1d154dae2b7e482"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ga93d2f045575afb161abff126c3750049"><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="group___p_c_m___helpers.html#ga93d2f045575afb161abff126c3750049">snd_pcm_area_copy</a> (const <a class="el" href="structsnd__pcm__channel__area__t.html">snd_pcm_channel_area_t</a> *dst_channel, <a class="el" href="group___p_c_m.html#gab01fcfe9b97382a8d3f2027c664b8b8a">snd_pcm_uframes_t</a> dst_offset, const <a class="el" href="structsnd__pcm__channel__area__t.html">snd_pcm_channel_area_t</a> *src_channel, <a class="el" href="group___p_c_m.html#gab01fcfe9b97382a8d3f2027c664b8b8a">snd_pcm_uframes_t</a> src_offset, unsigned int samples, <a class="el" href="group___p_c_m.html#gaa14b7f26877a812acbb39811364177f8">snd_pcm_format_t</a> <a class="el" href="ump__msg_8h.html#a7864fd50d470f893524181b4a59d9828">format</a>)</td></tr>
<tr class="memdesc:ga93d2f045575afb161abff126c3750049"><td class="mdescLeft"> </td><td class="mdescRight">Copy an area. <a href="group___p_c_m___helpers.html#ga93d2f045575afb161abff126c3750049">More...</a><br /></td></tr>
<tr class="separator:ga93d2f045575afb161abff126c3750049"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:gad57f8921f52ea2ffd870cafb2d076f2c"><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="group___p_c_m___helpers.html#gad57f8921f52ea2ffd870cafb2d076f2c">snd_pcm_areas_copy</a> (const <a class="el" href="structsnd__pcm__channel__area__t.html">snd_pcm_channel_area_t</a> *dst_channels, <a class="el" href="group___p_c_m.html#gab01fcfe9b97382a8d3f2027c664b8b8a">snd_pcm_uframes_t</a> dst_offset, const <a class="el" href="structsnd__pcm__channel__area__t.html">snd_pcm_channel_area_t</a> *src_channels, <a class="el" href="group___p_c_m.html#gab01fcfe9b97382a8d3f2027c664b8b8a">snd_pcm_uframes_t</a> src_offset, unsigned int channels, <a class="el" href="group___p_c_m.html#gab01fcfe9b97382a8d3f2027c664b8b8a">snd_pcm_uframes_t</a> frames, <a class="el" href="group___p_c_m.html#gaa14b7f26877a812acbb39811364177f8">snd_pcm_format_t</a> <a class="el" href="ump__msg_8h.html#a7864fd50d470f893524181b4a59d9828">format</a>)</td></tr>
<tr class="memdesc:gad57f8921f52ea2ffd870cafb2d076f2c"><td class="mdescLeft"> </td><td class="mdescRight">Copy one or more areas. <a href="group___p_c_m___helpers.html#gad57f8921f52ea2ffd870cafb2d076f2c">More...</a><br /></td></tr>
<tr class="separator:gad57f8921f52ea2ffd870cafb2d076f2c"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ga38797de781a0e4041408c58d49463062"><td class="memItemLeft" align="right" valign="top">int </td><td class="memItemRight" valign="bottom"><a class="el" href="group___p_c_m___helpers.html#ga38797de781a0e4041408c58d49463062">snd_pcm_areas_copy_wrap</a> (const <a class="el" href="structsnd__pcm__channel__area__t.html">snd_pcm_channel_area_t</a> *dst_channels, <a class="el" href="group___p_c_m.html#gab01fcfe9b97382a8d3f2027c664b8b8a">snd_pcm_uframes_t</a> dst_offset, const <a class="el" href="group___p_c_m.html#gab01fcfe9b97382a8d3f2027c664b8b8a">snd_pcm_uframes_t</a> dst_size, const <a class="el" href="structsnd__pcm__channel__area__t.html">snd_pcm_channel_area_t</a> *src_channels, <a class="el" href="group___p_c_m.html#gab01fcfe9b97382a8d3f2027c664b8b8a">snd_pcm_uframes_t</a> src_offset, const <a class="el" href="group___p_c_m.html#gab01fcfe9b97382a8d3f2027c664b8b8a">snd_pcm_uframes_t</a> src_size, const unsigned int channels, <a class="el" href="group___p_c_m.html#gab01fcfe9b97382a8d3f2027c664b8b8a">snd_pcm_uframes_t</a> frames, const <a class="el" href="group___p_c_m.html#gaa14b7f26877a812acbb39811364177f8">snd_pcm_format_t</a> <a class="el" href="ump__msg_8h.html#a7864fd50d470f893524181b4a59d9828">format</a>)</td></tr>
<tr class="memdesc:ga38797de781a0e4041408c58d49463062"><td class="mdescLeft"> </td><td class="mdescRight">Copy one or more areas. <a href="group___p_c_m___helpers.html#ga38797de781a0e4041408c58d49463062">More...</a><br /></td></tr>
<tr class="separator:ga38797de781a0e4041408c58d49463062"><td class="memSeparator" colspan="2"> </td></tr>
</table>
<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
<p>See the <a class="el" href="pcm.html">PCM (digital audio) interface</a> page for more details. </p>
<h2 class="groupheader">Function Documentation</h2>
<a id="ga93d2f045575afb161abff126c3750049"></a>
<h2 class="memtitle"><span class="permalink"><a href="#ga93d2f045575afb161abff126c3750049">◆ </a></span>snd_pcm_area_copy()</h2>
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<td class="memname">int snd_pcm_area_copy </td>
<td>(</td>
<td class="paramtype">const <a class="el" href="structsnd__pcm__channel__area__t.html">snd_pcm_channel_area_t</a> * </td>
<td class="paramname"><em>dst_area</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="group___p_c_m.html#gab01fcfe9b97382a8d3f2027c664b8b8a">snd_pcm_uframes_t</a> </td>
<td class="paramname"><em>dst_offset</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const <a class="el" href="structsnd__pcm__channel__area__t.html">snd_pcm_channel_area_t</a> * </td>
<td class="paramname"><em>src_area</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="group___p_c_m.html#gab01fcfe9b97382a8d3f2027c664b8b8a">snd_pcm_uframes_t</a> </td>
<td class="paramname"><em>src_offset</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">unsigned int </td>
<td class="paramname"><em>samples</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="group___p_c_m.html#gaa14b7f26877a812acbb39811364177f8">snd_pcm_format_t</a> </td>
<td class="paramname"><em>format</em> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td>
</tr>
</table>
</div><div class="memdoc">
<p>Copy an area. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">dst_area</td><td>destination area specification </td></tr>
<tr><td class="paramname">dst_offset</td><td>offset in frames inside destination area </td></tr>
<tr><td class="paramname">src_area</td><td>source area specification </td></tr>
<tr><td class="paramname">src_offset</td><td>offset in frames inside source area </td></tr>
<tr><td class="paramname">samples</td><td>samples to copy </td></tr>
<tr><td class="paramname">format</td><td>PCM sample format </td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>0 on success otherwise a negative error code </dd></dl>
</div>
</div>
<a id="ga23e03a8b127764fff669240986b96b39"></a>
<h2 class="memtitle"><span class="permalink"><a href="#ga23e03a8b127764fff669240986b96b39">◆ </a></span>snd_pcm_area_silence()</h2>
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<td class="memname">int snd_pcm_area_silence </td>
<td>(</td>
<td class="paramtype">const <a class="el" href="structsnd__pcm__channel__area__t.html">snd_pcm_channel_area_t</a> * </td>
<td class="paramname"><em>dst_area</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="group___p_c_m.html#gab01fcfe9b97382a8d3f2027c664b8b8a">snd_pcm_uframes_t</a> </td>
<td class="paramname"><em>dst_offset</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">unsigned int </td>
<td class="paramname"><em>samples</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="group___p_c_m.html#gaa14b7f26877a812acbb39811364177f8">snd_pcm_format_t</a> </td>
<td class="paramname"><em>format</em> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td>
</tr>
</table>
</div><div class="memdoc">
<p>Silence an area. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">dst_area</td><td>area specification </td></tr>
<tr><td class="paramname">dst_offset</td><td>offset in frames inside area </td></tr>
<tr><td class="paramname">samples</td><td>samples to silence </td></tr>
<tr><td class="paramname">format</td><td>PCM sample format </td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>0 on success otherwise a negative error code </dd></dl>
</div>
</div>
<a id="gad57f8921f52ea2ffd870cafb2d076f2c"></a>
<h2 class="memtitle"><span class="permalink"><a href="#gad57f8921f52ea2ffd870cafb2d076f2c">◆ </a></span>snd_pcm_areas_copy()</h2>
<div class="memitem">
<div class="memproto">
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<td class="memname">int snd_pcm_areas_copy </td>
<td>(</td>
<td class="paramtype">const <a class="el" href="structsnd__pcm__channel__area__t.html">snd_pcm_channel_area_t</a> * </td>
<td class="paramname"><em>dst_areas</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="group___p_c_m.html#gab01fcfe9b97382a8d3f2027c664b8b8a">snd_pcm_uframes_t</a> </td>
<td class="paramname"><em>dst_offset</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const <a class="el" href="structsnd__pcm__channel__area__t.html">snd_pcm_channel_area_t</a> * </td>
<td class="paramname"><em>src_areas</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="group___p_c_m.html#gab01fcfe9b97382a8d3f2027c664b8b8a">snd_pcm_uframes_t</a> </td>
<td class="paramname"><em>src_offset</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">unsigned int </td>
<td class="paramname"><em>channels</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="group___p_c_m.html#gab01fcfe9b97382a8d3f2027c664b8b8a">snd_pcm_uframes_t</a> </td>
<td class="paramname"><em>frames</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="group___p_c_m.html#gaa14b7f26877a812acbb39811364177f8">snd_pcm_format_t</a> </td>
<td class="paramname"><em>format</em> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td>
</tr>
</table>
</div><div class="memdoc">
<p>Copy one or more areas. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">dst_areas</td><td>destination areas specification (one for each channel) </td></tr>
<tr><td class="paramname">dst_offset</td><td>offset in frames inside destination area </td></tr>
<tr><td class="paramname">src_areas</td><td>source areas specification (one for each channel) </td></tr>
<tr><td class="paramname">src_offset</td><td>offset in frames inside source area </td></tr>
<tr><td class="paramname">channels</td><td>channels count </td></tr>
<tr><td class="paramname">frames</td><td>frames to copy </td></tr>
<tr><td class="paramname">format</td><td>PCM sample format </td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>0 on success otherwise a negative error code </dd></dl>
</div>
</div>
<a id="ga38797de781a0e4041408c58d49463062"></a>
<h2 class="memtitle"><span class="permalink"><a href="#ga38797de781a0e4041408c58d49463062">◆ </a></span>snd_pcm_areas_copy_wrap()</h2>
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<td class="memname">int snd_pcm_areas_copy_wrap </td>
<td>(</td>
<td class="paramtype">const <a class="el" href="structsnd__pcm__channel__area__t.html">snd_pcm_channel_area_t</a> * </td>
<td class="paramname"><em>dst_channels</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="group___p_c_m.html#gab01fcfe9b97382a8d3f2027c664b8b8a">snd_pcm_uframes_t</a> </td>
<td class="paramname"><em>dst_offset</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const <a class="el" href="group___p_c_m.html#gab01fcfe9b97382a8d3f2027c664b8b8a">snd_pcm_uframes_t</a> </td>
<td class="paramname"><em>dst_size</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const <a class="el" href="structsnd__pcm__channel__area__t.html">snd_pcm_channel_area_t</a> * </td>
<td class="paramname"><em>src_channels</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="group___p_c_m.html#gab01fcfe9b97382a8d3f2027c664b8b8a">snd_pcm_uframes_t</a> </td>
<td class="paramname"><em>src_offset</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const <a class="el" href="group___p_c_m.html#gab01fcfe9b97382a8d3f2027c664b8b8a">snd_pcm_uframes_t</a> </td>
<td class="paramname"><em>src_size</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const unsigned int </td>
<td class="paramname"><em>channels</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="group___p_c_m.html#gab01fcfe9b97382a8d3f2027c664b8b8a">snd_pcm_uframes_t</a> </td>
<td class="paramname"><em>frames</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const <a class="el" href="group___p_c_m.html#gaa14b7f26877a812acbb39811364177f8">snd_pcm_format_t</a> </td>
<td class="paramname"><em>format</em> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td>
</tr>
</table>
</div><div class="memdoc">
<p>Copy one or more areas. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">dst_channels</td><td>destination areas specification (one for each channel) </td></tr>
<tr><td class="paramname">dst_offset</td><td>offset in frames inside destination area </td></tr>
<tr><td class="paramname">dst_size</td><td>size in frames of the destination buffer </td></tr>
<tr><td class="paramname">src_channels</td><td>source areas specification (one for each channel) </td></tr>
<tr><td class="paramname">src_offset</td><td>offset in frames inside source area </td></tr>
<tr><td class="paramname">src_size</td><td>size in frames of the source buffer </td></tr>
<tr><td class="paramname">channels</td><td>channels count </td></tr>
<tr><td class="paramname">frames</td><td>frames to copy </td></tr>
<tr><td class="paramname">format</td><td>PCM sample format </td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>0 on success otherwise a negative error code </dd></dl>
</div>
</div>
<a id="ga1c0aab2a2bb341f1b1d154dae2b7e482"></a>
<h2 class="memtitle"><span class="permalink"><a href="#ga1c0aab2a2bb341f1b1d154dae2b7e482">◆ </a></span>snd_pcm_areas_silence()</h2>
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<td class="memname">int snd_pcm_areas_silence </td>
<td>(</td>
<td class="paramtype">const <a class="el" href="structsnd__pcm__channel__area__t.html">snd_pcm_channel_area_t</a> * </td>
<td class="paramname"><em>dst_areas</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="group___p_c_m.html#gab01fcfe9b97382a8d3f2027c664b8b8a">snd_pcm_uframes_t</a> </td>
<td class="paramname"><em>dst_offset</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">unsigned int </td>
<td class="paramname"><em>channels</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="group___p_c_m.html#gab01fcfe9b97382a8d3f2027c664b8b8a">snd_pcm_uframes_t</a> </td>
<td class="paramname"><em>frames</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="group___p_c_m.html#gaa14b7f26877a812acbb39811364177f8">snd_pcm_format_t</a> </td>
<td class="paramname"><em>format</em> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td>
</tr>
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<p>Silence one or more areas. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">dst_areas</td><td>areas specification (one for each channel) </td></tr>
<tr><td class="paramname">dst_offset</td><td>offset in frames inside area </td></tr>
<tr><td class="paramname">channels</td><td>channels count </td></tr>
<tr><td class="paramname">frames</td><td>frames to silence </td></tr>
<tr><td class="paramname">format</td><td>PCM sample format </td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>0 on success otherwise a negative error code </dd></dl>
</div>
</div>
<a id="ga5f5ab1ac13de9598cf05877e4894e0d8"></a>
<h2 class="memtitle"><span class="permalink"><a href="#ga5f5ab1ac13de9598cf05877e4894e0d8">◆ </a></span>snd_pcm_build_linear_format()</h2>
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<td class="memname"><a class="el" href="group___p_c_m.html#gaa14b7f26877a812acbb39811364177f8">snd_pcm_format_t</a> snd_pcm_build_linear_format </td>
<td>(</td>
<td class="paramtype">int </td>
<td class="paramname"><em>width</em>, </td>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">int </td>
<td class="paramname"><em>pwidth</em>, </td>
</tr>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">int </td>
<td class="paramname"><em>unsignd</em>, </td>
</tr>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">int </td>
<td class="paramname"><em>big_endian</em> </td>
</tr>
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<td>)</td>
<td></td><td></td>
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</table>
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<p>Compose a PCM sample linear format. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">width</td><td>Nominal bits per sample </td></tr>
<tr><td class="paramname">pwidth</td><td>Physical bit width of the format </td></tr>
<tr><td class="paramname">unsignd</td><td>Sign: 0 signed, 1 unsigned </td></tr>
<tr><td class="paramname">big_endian</td><td>Endian: 0 little endian, 1 big endian </td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>The matching format type, or <a class="el" href="group___p_c_m.html#ggaa14b7f26877a812acbb39811364177f8ab1e118ecdccf628639b5c85bc3a48999">SND_PCM_FORMAT_UNKNOWN</a> if no match </dd></dl>
</div>
</div>
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<h2 class="memtitle"><span class="permalink"><a href="#gaf42fb6af35d3d85006c1dea2e11b3e54">◆ </a></span>snd_pcm_bytes_to_frames()</h2>
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<td class="memname"><a class="el" href="group___p_c_m.html#ga71cdfa37e258d2210b8bd0216bf0c36c">snd_pcm_sframes_t</a> snd_pcm_bytes_to_frames </td>
<td>(</td>
<td class="paramtype"><a class="el" href="group___p_c_m.html#ga919e634deecd855b6e2e15174e70d3ea">snd_pcm_t</a> * </td>
<td class="paramname"><em>pcm</em>, </td>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">ssize_t </td>
<td class="paramname"><em>bytes</em> </td>
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<td></td>
<td>)</td>
<td></td><td></td>
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</table>
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<p>Convert bytes in frames for a PCM. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">pcm</td><td>PCM handle </td></tr>
<tr><td class="paramname">bytes</td><td>quantity in bytes </td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>quantity expressed in frames </dd></dl>
</div>
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<h2 class="memtitle"><span class="permalink"><a href="#gaeed610ddb01120b01b5a2e5cc59aa35b">◆ </a></span>snd_pcm_bytes_to_samples()</h2>
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<td class="memname">long snd_pcm_bytes_to_samples </td>
<td>(</td>
<td class="paramtype"><a class="el" href="group___p_c_m.html#ga919e634deecd855b6e2e15174e70d3ea">snd_pcm_t</a> * </td>
<td class="paramname"><em>pcm</em>, </td>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">ssize_t </td>
<td class="paramname"><em>bytes</em> </td>
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<td>)</td>
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<p>Convert bytes in samples for a PCM. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">pcm</td><td>PCM handle </td></tr>
<tr><td class="paramname">bytes</td><td>quantity in bytes </td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>quantity expressed in samples </dd></dl>
</div>
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<h2 class="memtitle"><span class="permalink"><a href="#ga3c0c224b8f67e73cf2447bee0110f760">◆ </a></span>snd_pcm_format_big_endian()</h2>
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<td class="memname">int snd_pcm_format_big_endian </td>
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<td class="paramtype"><a class="el" href="group___p_c_m.html#gaa14b7f26877a812acbb39811364177f8">snd_pcm_format_t</a> </td>
<td class="paramname"><em>format</em></td><td>)</td>
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<p>Return endian info for a PCM sample format. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">format</td><td>Format </td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>0 little endian, 1 big endian, a negative error code if endian independent </dd></dl>
<dl class="section examples"><dt>Examples</dt><dd><a class="el" href="_2test_2pcm_8c-example.html#a5">/test/pcm.c</a>.</dd>
</dl>
</div>
</div>
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<h2 class="memtitle"><span class="permalink"><a href="#gaf950358cdbb26bab53f63f28443bd2ef">◆ </a></span>snd_pcm_format_cpu_endian()</h2>
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<td class="memname">int snd_pcm_format_cpu_endian </td>
<td>(</td>
<td class="paramtype"><a class="el" href="group___p_c_m.html#gaa14b7f26877a812acbb39811364177f8">snd_pcm_format_t</a> </td>
<td class="paramname"><em>format</em></td><td>)</td>
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<p>Return endian info for a PCM sample format. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">format</td><td>Format </td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>0 swapped, 1 CPU endian, a negative error code if endian independent </dd></dl>
</div>
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<h2 class="memtitle"><span class="permalink"><a href="#ga36ae70bef5bfd5e7ecc743f6a4d46cb5">◆ </a></span>snd_pcm_format_float()</h2>
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<td class="memname">int snd_pcm_format_float </td>
<td>(</td>
<td class="paramtype"><a class="el" href="group___p_c_m.html#gaa14b7f26877a812acbb39811364177f8">snd_pcm_format_t</a> </td>
<td class="paramname"><em>format</em></td><td>)</td>
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<p>Return float info for a PCM sample format. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">format</td><td>Format </td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>0 non float, 1 float </dd></dl>
</div>
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<h2 class="memtitle"><span class="permalink"><a href="#ga5a52bb63323f463198dea3f3c6aca571">◆ </a></span>snd_pcm_format_linear()</h2>
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<td class="memname">int snd_pcm_format_linear </td>
<td>(</td>
<td class="paramtype"><a class="el" href="group___p_c_m.html#gaa14b7f26877a812acbb39811364177f8">snd_pcm_format_t</a> </td>
<td class="paramname"><em>format</em></td><td>)</td>
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<p>Return linear info for a PCM sample format. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">format</td><td>Format </td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>0 non linear, 1 linear </dd></dl>
<dl class="section examples"><dt>Examples</dt><dd><a class="el" href="_2test_2pcm_8c-example.html#a55">/test/pcm.c</a>.</dd>
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<h2 class="memtitle"><span class="permalink"><a href="#ga89537d0a972fa124051f6ba1a78c4bfa">◆ </a></span>snd_pcm_format_little_endian()</h2>
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<td class="memname">int snd_pcm_format_little_endian </td>
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<td class="paramtype"><a class="el" href="group___p_c_m.html#gaa14b7f26877a812acbb39811364177f8">snd_pcm_format_t</a> </td>
<td class="paramname"><em>format</em></td><td>)</td>
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<p>Return endian info for a PCM sample format. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">format</td><td>Format </td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>0 big endian, 1 little endian, a negative error code if endian independent </dd></dl>
</div>
</div>
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<h2 class="memtitle"><span class="permalink"><a href="#gaa3e0ff7560342e5af2b5c7bd2d63a307">◆ </a></span>snd_pcm_format_physical_width()</h2>
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<td class="memname">int snd_pcm_format_physical_width </td>
<td>(</td>
<td class="paramtype"><a class="el" href="group___p_c_m.html#gaa14b7f26877a812acbb39811364177f8">snd_pcm_format_t</a> </td>
<td class="paramname"><em>format</em></td><td>)</td>
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<p>Return the physical bit-width of the format (bits needed to store a PCM sample) </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">format</td><td>Sample format </td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>the physical bit-width of the format, or a negative error code if not applicable </dd></dl>
<dl class="section examples"><dt>Examples</dt><dd><a class="el" href="_2test_2latency_8c-example.html#a34">/test/latency.c</a>, and <a class="el" href="_2test_2pcm_8c-example.html#a4">/test/pcm.c</a>.</dd>
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<h2 class="memtitle"><span class="permalink"><a href="#ga82631361cf1c1d13af207beb59cf97ac">◆ </a></span>snd_pcm_format_set_silence()</h2>
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<td class="memname">int snd_pcm_format_set_silence </td>
<td>(</td>
<td class="paramtype"><a class="el" href="group___p_c_m.html#gaa14b7f26877a812acbb39811364177f8">snd_pcm_format_t</a> </td>
<td class="paramname"><em>format</em>, </td>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">void * </td>
<td class="paramname"><em>data</em>, </td>
</tr>
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<td class="paramkey"></td>
<td></td>
<td class="paramtype">unsigned int </td>
<td class="paramname"><em>samples</em> </td>
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<td></td>
<td>)</td>
<td></td><td></td>
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<p>Silence a PCM samples buffer. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">format</td><td>Sample format </td></tr>
<tr><td class="paramname">data</td><td>Buffer </td></tr>
<tr><td class="paramname">samples</td><td>Samples count </td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>0 if successful or a negative error code </dd></dl>
<dl class="section examples"><dt>Examples</dt><dd><a class="el" href="_2test_2latency_8c-example.html#a46">/test/latency.c</a>.</dd>
</dl>
</div>
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<h2 class="memtitle"><span class="permalink"><a href="#ga8b88181b11a026da55897a926d56034a">◆ </a></span>snd_pcm_format_signed()</h2>
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<td class="memname">int snd_pcm_format_signed </td>
<td>(</td>
<td class="paramtype"><a class="el" href="group___p_c_m.html#gaa14b7f26877a812acbb39811364177f8">snd_pcm_format_t</a> </td>
<td class="paramname"><em>format</em></td><td>)</td>
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<p>Return sign info for a PCM sample linear format. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">format</td><td>Format </td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>0 unsigned, 1 signed, a negative error code if format is not linear </dd></dl>
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<h2 class="memtitle"><span class="permalink"><a href="#gaba8e5060f74a9d91df8ea550bf8907fc">◆ </a></span>snd_pcm_format_silence()</h2>
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<td class="memname">uint8_t snd_pcm_format_silence </td>
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<td class="paramtype"><a class="el" href="group___p_c_m.html#gaa14b7f26877a812acbb39811364177f8">snd_pcm_format_t</a> </td>
<td class="paramname"><em>format</em></td><td>)</td>
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<p>Return 8 bit expressing silence for a PCM sample format. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">format</td><td>Sample format </td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>silence 8 bit word </dd></dl>
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<h2 class="memtitle"><span class="permalink"><a href="#gad5c4439da2367885c2a237ddf5aa1254">◆ </a></span>snd_pcm_format_silence_16()</h2>
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<td class="memname">uint16_t snd_pcm_format_silence_16 </td>
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<td class="paramtype"><a class="el" href="group___p_c_m.html#gaa14b7f26877a812acbb39811364177f8">snd_pcm_format_t</a> </td>
<td class="paramname"><em>format</em></td><td>)</td>
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<p>Return 16 bit expressing silence for a PCM sample format. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">format</td><td>Sample format </td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>silence 16 bit word </dd></dl>
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<h2 class="memtitle"><span class="permalink"><a href="#ga78c61e7eef7a20b24cf03fd2a664503e">◆ </a></span>snd_pcm_format_silence_32()</h2>
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<td class="memname">uint32_t snd_pcm_format_silence_32 </td>
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<td class="paramtype"><a class="el" href="group___p_c_m.html#gaa14b7f26877a812acbb39811364177f8">snd_pcm_format_t</a> </td>
<td class="paramname"><em>format</em></td><td>)</td>
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<p>Return 32 bit expressing silence for a PCM sample format. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">format</td><td>Sample format </td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>silence 32 bit word </dd></dl>
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<h2 class="memtitle"><span class="permalink"><a href="#ga2006cffa80cc83b99f6f33547be18f35">◆ </a></span>snd_pcm_format_silence_64()</h2>
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<td class="memname">uint64_t snd_pcm_format_silence_64 </td>
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<td class="paramtype"><a class="el" href="group___p_c_m.html#gaa14b7f26877a812acbb39811364177f8">snd_pcm_format_t</a> </td>
<td class="paramname"><em>format</em></td><td>)</td>
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<p>Return 64 bit expressing silence for a PCM sample format. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">format</td><td>Sample format </td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>silence 64 bit word </dd></dl>
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<h2 class="memtitle"><span class="permalink"><a href="#ga5953a58f024f8cf762a9e4dae6b09502">◆ </a></span>snd_pcm_format_size()</h2>
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<td class="memname">ssize_t snd_pcm_format_size </td>
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<td class="paramtype"><a class="el" href="group___p_c_m.html#gaa14b7f26877a812acbb39811364177f8">snd_pcm_format_t</a> </td>
<td class="paramname"><em>format</em>, </td>
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<td></td>
<td class="paramtype">size_t </td>
<td class="paramname"><em>samples</em> </td>
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<p>Return bytes needed to store a quantity of PCM sample. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">format</td><td>Sample format </td></tr>
<tr><td class="paramname">samples</td><td>Samples count </td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>bytes needed, a negative error code if not integer or unknown </dd></dl>
</div>
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<h2 class="memtitle"><span class="permalink"><a href="#ga8cd4e3ecc963942457e3b1b6f7661a90">◆ </a></span>snd_pcm_format_unsigned()</h2>
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<td class="memname">int snd_pcm_format_unsigned </td>
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<td class="paramtype"><a class="el" href="group___p_c_m.html#gaa14b7f26877a812acbb39811364177f8">snd_pcm_format_t</a> </td>
<td class="paramname"><em>format</em></td><td>)</td>
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<p>Return sign info for a PCM sample linear format. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">format</td><td>Format </td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>0 signed, 1 unsigned, a negative error code if format is not linear </dd></dl>
<dl class="section examples"><dt>Examples</dt><dd><a class="el" href="_2test_2pcm_8c-example.html#a6">/test/pcm.c</a>.</dd>
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<a id="ga8d4e07f2d68cc16f607857ed8a222a29"></a>
<h2 class="memtitle"><span class="permalink"><a href="#ga8d4e07f2d68cc16f607857ed8a222a29">◆ </a></span>snd_pcm_format_width()</h2>
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<td class="memname">int snd_pcm_format_width </td>
<td>(</td>
<td class="paramtype"><a class="el" href="group___p_c_m.html#gaa14b7f26877a812acbb39811364177f8">snd_pcm_format_t</a> </td>
<td class="paramname"><em>format</em></td><td>)</td>
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<p>Return the bit-width of the format. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">format</td><td>Sample format </td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>the bit-width of the format, or a negative error code if not applicable </dd></dl>
<dl class="section examples"><dt>Examples</dt><dd><a class="el" href="_2test_2pcm_8c-example.html#a3">/test/pcm.c</a>.</dd>
</dl>
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<a id="gac05ac2b7c6e25986a71792392ff90b83"></a>
<h2 class="memtitle"><span class="permalink"><a href="#gac05ac2b7c6e25986a71792392ff90b83">◆ </a></span>snd_pcm_frames_to_bytes()</h2>
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<td class="memname">ssize_t snd_pcm_frames_to_bytes </td>
<td>(</td>
<td class="paramtype"><a class="el" href="group___p_c_m.html#ga919e634deecd855b6e2e15174e70d3ea">snd_pcm_t</a> * </td>
<td class="paramname"><em>pcm</em>, </td>
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<td class="paramkey"></td>
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<td class="paramtype"><a class="el" href="group___p_c_m.html#ga71cdfa37e258d2210b8bd0216bf0c36c">snd_pcm_sframes_t</a> </td>
<td class="paramname"><em>frames</em> </td>
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<p>Convert frames in bytes for a PCM. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">pcm</td><td>PCM handle </td></tr>
<tr><td class="paramname">frames</td><td>quantity in frames </td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>quantity expressed in bytes </dd></dl>
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<a id="gae3669a4326ce185f4261d7bf96900f3f"></a>
<h2 class="memtitle"><span class="permalink"><a href="#gae3669a4326ce185f4261d7bf96900f3f">◆ </a></span>snd_pcm_samples_to_bytes()</h2>
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<td class="memname">ssize_t snd_pcm_samples_to_bytes </td>
<td>(</td>
<td class="paramtype"><a class="el" href="group___p_c_m.html#ga919e634deecd855b6e2e15174e70d3ea">snd_pcm_t</a> * </td>
<td class="paramname"><em>pcm</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">long </td>
<td class="paramname"><em>samples</em> </td>
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<td>)</td>
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<p>Convert samples in bytes for a PCM. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramname">pcm</td><td>PCM handle </td></tr>
<tr><td class="paramname">samples</td><td>quantity in samples </td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>quantity expressed in bytes </dd></dl>
</div>
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