<div dir="ltr"><div>Thx Bob for your advice.<br>I'll try to re-sample then encode.</div><div><br></div><br clear="all"><div><div dir="ltr" class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><div><table style="vertical-align:-webkit-baseline-middle;font-size:medium;font-family:Arial" cellspacing="0" cellpadding="0"><tbody><tr><td><table style="vertical-align:-webkit-baseline-middle;font-family:Arial" cellspacing="0" cellpadding="0"><tbody><tr><td style="vertical-align:middle" width="150"><img alt="avatar" src="https://viadialog-signature-assets.s3-eu-west-1.amazonaws.com/avatars/avatar-julien-baumgarten.jfif" style="max-width:130px;border-color:#5e86c3;border-radius:50% 50% 50% 50%;border-style:solid;border-width:4px" width="130"> <a rel="noopener noreferrer" href="https://www.viadialog.com/?utm_source=signature&utm_medium=email&utm_campaign=email_signature_logo" color="#000000" style="color:rgb(102,102,102);font-size:12px" target="_blank"><img alt="viadialog" src="https://viadialog-signature-assets.s3-eu-west-1.amazonaws.com/shared/viadialog-logo-color.png" style="margin-top:5px;max-width:130px" width="130"></a></td><td width="30"><div style="width:30px"></div></td><td color="#5e86c3" style="width:3px;background-color:#5e86c3;border-bottom:none;border-radius:1.5px" width="3"></td><td width="30"><div style="width:30px"></div></td><td style="vertical-align:bottom"><h3 color="#000000" style="margin:0;font-size:18px;color:#000">Julien BAUMGARTEN</h3><p color="#000000" style="margin:0;color:#eb651d;font-size:15px;line-height:22px;margin-bottom:15px">Chef de Projet Développement</p><a href="tel:0177453094" color="#000000" style="color:rgb(102,102,102);font-size:12px" target="_blank"><p color="#000000" style="margin:0px;font-size:14px;line-height:22px">01 77 45 30 94</p></a><a href="mailto:julien.baumgarten@viadialog.com" color="#000000" style="color:rgb(102,102,102);font-size:12px" target="_blank"><p color="#000000" style="margin:0px;font-size:14px;line-height:22px">julien.baumgarten@viadialog.com</p></a><a rel="noopener noreferrer" href="https://www.viadialog.com/?utm_source=signature&utm_medium=email&utm_campaign=email_signature_link" color="#000000" style="color:rgb(102,102,102);font-size:12px" target="_blank"><p color="#000000" style="margin:0px;font-size:14px;line-height:22px">www.viadialog.com</p></a><p color="#000000" style="margin:0px;color:rgb(102,102,102);font-size:14px;line-height:22px">152 Boulevard Pereire, 75017 Paris</p><table style="vertical-align:-webkit-baseline-middle;font-family:Arial;width:100%" cellspacing="0" cellpadding="0"><tbody><tr><td style="vertical-align:top"><table style="vertical-align:-webkit-baseline-middle;font-family:Arial;display:inline-block" cellspacing="0" cellpadding="0"><tbody><tr style="text-align:right"><td><a rel="noopener noreferrer" href="https://www.facebook.com/viadialog" style="display:inline-block;padding:0" target="_blank"><img src="https://viadialog-signature-assets.s3-eu-west-1.amazonaws.com/shared/facebook.png" alt="facebook" style="max-width:135px;display:block" height="24"></a></td><td width="5"><div></div></td><td><a rel="noopener noreferrer" href="https://twitter.com/viadialog" style="display:inline-block;padding:0" target="_blank"><img src="https://viadialog-signature-assets.s3-eu-west-1.amazonaws.com/shared/twitter.png" alt="twitter" style="max-width:135px;display:block" height="24"></a></td><td width="5"><div></div></td><td><a rel="noopener noreferrer" href="https://www.linkedin.com/company/viatelecom" style="display:inline-block;padding:0" target="_blank"><img src="https://viadialog-signature-assets.s3-eu-west-1.amazonaws.com/shared/linkedin.png" alt="linkedin" style="max-width:135px;display:block" height="24"></a></td><td width="5"><div></div></td></tr></tbody></table></td></tr></tbody></table></td></tr></tbody></table></td></tr><tr><td height="20"></td></tr><tr><td><span style="display:block"><a rel="noopener noreferrer" href="https://www.viadialog.com/?utm_source=signature&utm_medium=email&utm_campaign=email_signature_banner" style="border-width:initial;border-style:none;border-color:initial;display:inline-block;background-color:transparent;color:rgb(255,255,255);font-weight:700;text-align:center;line-height:1;font-size:12px;border-radius:3px" target="_blank"><img src="https://viadialog-signature-assets.s3-eu-west-1.amazonaws.com/shared/banner-viadialog.png" style="max-width:728px"></a></span></td></tr><tr><td height="20"></td></tr><tr><td><span style="display:block;font-size:8px;color:rgb(136,136,136);padding-top:5px">This
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</div></div></div><br></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">Le ven. 27 août 2021 à 17:31, Bob Kirnum <<a href="mailto:bkirnum@gmail.com">bkirnum@gmail.com</a>> a écrit :<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr">My understanding is that re-sampling is done on linear PCM, not encoded audio (G.711 PCM). I always encode after re-sampling.</div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Fri, Aug 27, 2021 at 6:38 AM Baumgarten, Julien <<a href="mailto:julien.baumgarten@viadialog.com" target="_blank">julien.baumgarten@viadialog.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr">I don't succeed in encode with ffmpeg library.<div>So I do the encoding before the resampling.</div><div><br clear="all"><div><div dir="ltr"><div dir="ltr"><div><table style="vertical-align:-webkit-baseline-middle;font-size:medium;font-family:Arial" cellspacing="0" cellpadding="0"><tbody><tr><td><table style="vertical-align:-webkit-baseline-middle;font-family:Arial" cellspacing="0" cellpadding="0"><tbody><tr><td style="vertical-align:middle" width="150"><img alt="avatar" src="https://viadialog-signature-assets.s3-eu-west-1.amazonaws.com/avatars/avatar-julien-baumgarten.jfif" style="max-width: 130px; border-color: rgb(94, 134, 195); border-radius: 50%; border-style: solid; border-width: 4px;" width="130"> <a rel="noopener noreferrer" href="https://www.viadialog.com/?utm_source=signature&utm_medium=email&utm_campaign=email_signature_logo" color="#000000" style="color:rgb(102,102,102);font-size:12px" target="_blank"><img alt="viadialog" src="https://viadialog-signature-assets.s3-eu-west-1.amazonaws.com/shared/viadialog-logo-color.png" style="margin-top: 5px; max-width: 130px;" width="130"></a></td><td width="30"><div style="width:30px"></div></td><td color="#5e86c3" style="width:3px;background-color:rgb(94,134,195);border-bottom:none;border-radius:1.5px" width="3"></td><td width="30"><div style="width:30px"></div></td><td style="vertical-align:bottom"><h3 color="#000000" style="margin:0px;font-size:18px;color:rgb(0,0,0)">Julien BAUMGARTEN</h3><p color="#000000" style="margin:0px 0px 15px;color:rgb(235,101,29);font-size:15px;line-height:22px">Chef de Projet Développement</p><a href="tel:0177453094" color="#000000" style="color:rgb(102,102,102);font-size:12px" target="_blank"><p color="#000000" style="margin:0px;font-size:14px;line-height:22px">01 77 45 30 94</p></a><a href="mailto:julien.baumgarten@viadialog.com" color="#000000" style="color:rgb(102,102,102);font-size:12px" target="_blank"><p color="#000000" style="margin:0px;font-size:14px;line-height:22px">julien.baumgarten@viadialog.com</p></a><a rel="noopener noreferrer" href="https://www.viadialog.com/?utm_source=signature&utm_medium=email&utm_campaign=email_signature_link" color="#000000" style="color:rgb(102,102,102);font-size:12px" target="_blank"><p color="#000000" style="margin:0px;font-size:14px;line-height:22px">www.viadialog.com</p></a><p color="#000000" style="margin:0px;color:rgb(102,102,102);font-size:14px;line-height:22px">152 Boulevard Pereire, 75017 Paris</p><table style="vertical-align:-webkit-baseline-middle;font-family:Arial;width:100%" cellspacing="0" cellpadding="0"><tbody><tr><td style="vertical-align:top"><table style="vertical-align:-webkit-baseline-middle;font-family:Arial;display:inline-block" cellspacing="0" cellpadding="0"><tbody><tr style="text-align:right"><td><a rel="noopener noreferrer" href="https://www.facebook.com/viadialog" style="display:inline-block;padding:0px" target="_blank"><img src="https://viadialog-signature-assets.s3-eu-west-1.amazonaws.com/shared/facebook.png" alt="facebook" style="max-width: 135px; display: block;" height="24"></a></td><td width="5"><div></div></td><td><a rel="noopener noreferrer" href="https://twitter.com/viadialog" style="display:inline-block;padding:0px" target="_blank"><img src="https://viadialog-signature-assets.s3-eu-west-1.amazonaws.com/shared/twitter.png" alt="twitter" style="max-width: 135px; display: block;" height="24"></a></td><td width="5"><div></div></td><td><a rel="noopener noreferrer" href="https://www.linkedin.com/company/viatelecom" style="display:inline-block;padding:0px" target="_blank"><img src="https://viadialog-signature-assets.s3-eu-west-1.amazonaws.com/shared/linkedin.png" alt="linkedin" style="max-width: 135px; display: block;" height="24"></a></td><td width="5"><div></div></td></tr></tbody></table></td></tr></tbody></table></td></tr></tbody></table></td></tr><tr><td height="20"></td></tr><tr><td><span style="display:block"><a rel="noopener noreferrer" href="https://www.viadialog.com/?utm_source=signature&utm_medium=email&utm_campaign=email_signature_banner" style="border-width:initial;border-style:none;border-color:initial;display:inline-block;background-color:transparent;color:rgb(255,255,255);font-weight:700;text-align:center;line-height:1;font-size:12px;border-radius:3px" target="_blank"><img src="https://viadialog-signature-assets.s3-eu-west-1.amazonaws.com/shared/banner-viadialog.png" style="max-width: 728px;"></a></span></td></tr><tr><td height="20"></td></tr><tr><td><span style="display:block;font-size:8px;color:rgb(136,136,136);padding-top:5px">This
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</div></div></div><br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">Le ven. 27 août 2021 à 12:55, Bob Kirnum <<a href="mailto:bkirnum@gmail.com" target="_blank">bkirnum@gmail.com</a>> a écrit :<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr">In addition to re-sampling from 16 kHz to 8 kHz, are you then encoding the resulting 8 kHz linear PCM (16 bit?) to G.711 (Alaw?)?</div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Fri, Aug 27, 2021 at 2:08 AM Baumgarten, Julien <<a href="mailto:julien.baumgarten@viadialog.com" target="_blank">julien.baumgarten@viadialog.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr">Hi Polochon,<div><br></div><div>Thx for your answer. I know I'll lose on audio quality by resampling 16kHZ to 8kHZ but I need to play the audio on VOIP calls which requires G711 a-law 8k HZ samples :(</div><div>If I work with your command line, the sound is faaaaaaaaaaar much better. No noise at all</div><div><br></div><div><br clear="all"><div><div dir="ltr"><div dir="ltr"><div><table style="vertical-align:-webkit-baseline-middle;font-size:medium;font-family:Arial" cellspacing="0" cellpadding="0"><tbody><tr><td><table style="vertical-align:-webkit-baseline-middle;font-family:Arial" cellspacing="0" cellpadding="0"><tbody><tr><td style="vertical-align:middle" width="150"><img alt="avatar" src="https://viadialog-signature-assets.s3-eu-west-1.amazonaws.com/avatars/avatar-julien-baumgarten.jfif" style="max-width: 130px; border-color: rgb(94, 134, 195); border-radius: 50%; border-style: solid; border-width: 4px;" width="130"> <a rel="noopener noreferrer" href="https://www.viadialog.com/?utm_source=signature&utm_medium=email&utm_campaign=email_signature_logo" color="#000000" style="color:rgb(102,102,102);font-size:12px" target="_blank"><img alt="viadialog" src="https://viadialog-signature-assets.s3-eu-west-1.amazonaws.com/shared/viadialog-logo-color.png" style="margin-top: 5px; max-width: 130px;" width="130"></a></td><td width="30"><div style="width:30px"></div></td><td color="#5e86c3" style="width:3px;background-color:rgb(94,134,195);border-bottom:none;border-radius:1.5px" width="3"></td><td width="30"><div style="width:30px"></div></td><td style="vertical-align:bottom"><h3 color="#000000" style="margin:0px;font-size:18px;color:rgb(0,0,0)">Julien BAUMGARTEN</h3><p color="#000000" style="margin:0px 0px 15px;color:rgb(235,101,29);font-size:15px;line-height:22px">Chef de Projet Développement</p><a href="tel:0177453094" color="#000000" style="color:rgb(102,102,102);font-size:12px" target="_blank"><p color="#000000" style="margin:0px;font-size:14px;line-height:22px">01 77 45 30 94</p></a><a href="mailto:julien.baumgarten@viadialog.com" color="#000000" style="color:rgb(102,102,102);font-size:12px" target="_blank"><p color="#000000" style="margin:0px;font-size:14px;line-height:22px">julien.baumgarten@viadialog.com</p></a><a rel="noopener noreferrer" href="https://www.viadialog.com/?utm_source=signature&utm_medium=email&utm_campaign=email_signature_link" color="#000000" style="color:rgb(102,102,102);font-size:12px" target="_blank"><p color="#000000" style="margin:0px;font-size:14px;line-height:22px">www.viadialog.com</p></a><p color="#000000" style="margin:0px;color:rgb(102,102,102);font-size:14px;line-height:22px">152 Boulevard Pereire, 75017 Paris</p><table style="vertical-align:-webkit-baseline-middle;font-family:Arial;width:100%" cellspacing="0" cellpadding="0"><tbody><tr><td style="vertical-align:top"><table style="vertical-align:-webkit-baseline-middle;font-family:Arial;display:inline-block" cellspacing="0" cellpadding="0"><tbody><tr style="text-align:right"><td><a rel="noopener noreferrer" href="https://www.facebook.com/viadialog" style="display:inline-block;padding:0px" target="_blank"><img src="https://viadialog-signature-assets.s3-eu-west-1.amazonaws.com/shared/facebook.png" alt="facebook" style="max-width: 135px; display: block;" height="24"></a></td><td width="5"><div></div></td><td><a rel="noopener noreferrer" href="https://twitter.com/viadialog" style="display:inline-block;padding:0px" target="_blank"><img src="https://viadialog-signature-assets.s3-eu-west-1.amazonaws.com/shared/twitter.png" alt="twitter" style="max-width: 135px; display: block;" height="24"></a></td><td width="5"><div></div></td><td><a rel="noopener noreferrer" href="https://www.linkedin.com/company/viatelecom" style="display:inline-block;padding:0px" target="_blank"><img src="https://viadialog-signature-assets.s3-eu-west-1.amazonaws.com/shared/linkedin.png" alt="linkedin" style="max-width: 135px; display: block;" height="24"></a></td><td width="5"><div></div></td></tr></tbody></table></td></tr></tbody></table></td></tr></tbody></table></td></tr><tr><td height="20"></td></tr><tr><td><span style="display:block"><a rel="noopener noreferrer" href="https://www.viadialog.com/?utm_source=signature&utm_medium=email&utm_campaign=email_signature_banner" style="border-width:initial;border-style:none;border-color:initial;display:inline-block;background-color:transparent;color:rgb(255,255,255);font-weight:700;text-align:center;line-height:1;font-size:12px;border-radius:3px" target="_blank"><img src="https://viadialog-signature-assets.s3-eu-west-1.amazonaws.com/shared/banner-viadialog.png" style="max-width: 728px;"></a></span></td></tr><tr><td height="20"></td></tr><tr><td><span style="display:block;font-size:8px;color:rgb(136,136,136);padding-top:5px">This
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</div></div></div><br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">Le ven. 27 août 2021 à 00:00, Polochon Street <<a href="mailto:polochonstreet@gmx.fr" target="_blank">polochonstreet@gmx.fr</a>> a écrit :<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
<div>
<p>Hi,</p>
<p>I'm by no means an expert, but just a remark - 8kHz is somewhat
low quality, so maybe that's why the audio sounds awful?</p>
<p>Does it sound better when you try resampling it manually via
something like `ffmpeg -i input.wav -ar 8000 output.wav`?</p>
<p>Best,<br>
Paul<br>
</p>
<div> Le 26/08/2021 à 20:55, Baumgarten,
Julien a écrit :<br>
</div>
<blockquote type="cite">
<div dir="ltr">
<div>Hi guys,</div>
<div><br>
I made a previous post in order to get some help in
converting + resampling 16bit PCM (16k HZ) samples to A-law
PCM (8k HZ) samples.</div>
<div>I succeeded in converting with another library than ffmpeg
but it works.<br>
I am focusing now on the resampling.</div>
<div><br>
</div>
<div>I tried the following source code:</div>
<div><br>
</div>
<div>
<pre style="background-color:rgb(43,43,43);color:rgb(169,183,198);font-family:"JetBrains Mono",monospace"><span style="color:rgb(185,188,209)">int64_t </span>src_ch_layout = <span style="color:rgb(144,139,37)">AV_CH_LAYOUT_MONO</span><span style="color:rgb(204,120,50)">, </span>dst_ch_layout = <span style="color:rgb(144,139,37)">AV_CH_LAYOUT_MONO</span><span style="color:rgb(204,120,50)">;
</span><span style="color:rgb(204,120,50)"> int </span>src_rate = <span style="color:rgb(104,151,187)">16000</span><span style="color:rgb(204,120,50)">, </span>dst_rate = <span style="color:rgb(104,151,187)">8000</span><span style="color:rgb(204,120,50)">;
</span><span style="color:rgb(204,120,50)"> </span><span style="color:rgb(185,188,209)">uint8_t </span>**src_data = <span style="color:rgb(144,139,37)">NULL</span><span style="color:rgb(204,120,50)">, </span>**dst_data = <span style="color:rgb(144,139,37)">NULL</span><span style="color:rgb(204,120,50)">;
</span><span style="color:rgb(204,120,50)"> int </span>src_nb_channels = <span style="color:rgb(104,151,187)">0</span><span style="color:rgb(204,120,50)">, </span>dst_nb_channels = <span style="color:rgb(104,151,187)">0</span><span style="color:rgb(204,120,50)">;
</span><span style="color:rgb(204,120,50)"> int </span>src_linesize = <span style="color:rgb(104,151,187)">0</span><span style="color:rgb(204,120,50)">, </span>dst_linesize = <span style="color:rgb(104,151,187)">0</span><span style="color:rgb(204,120,50)">;
</span><span style="color:rgb(204,120,50)"> int </span>src_nb_samples = <span style="color:rgb(204,120,50)">this</span>-><span style="color:rgb(147,115,165)">_nbSamplesReceived</span><span style="color:rgb(204,120,50)">, </span>dst_nb_samples<span style="color:rgb(204,120,50)">;
</span><span style="color:rgb(204,120,50)"> enum </span><span style="color:rgb(181,182,227)">AVSampleFormat </span>src_sample_fmt = <span style="color:rgb(152,118,170);font-style:italic">AV_SAMPLE_FMT_U8</span><span style="color:rgb(204,120,50)">, </span>dst_sample_fmt = <span style="color:rgb(152,118,170);font-style:italic">AV_SAMPLE_FMT_U8</span><span style="color:rgb(204,120,50)">;
</span><span style="color:rgb(204,120,50)"> const char </span>*dst_filename = <span style="color:rgb(106,135,89)">"/tmp/resample.raw"</span><span style="color:rgb(204,120,50)">;
</span><span style="color:rgb(204,120,50)"> </span><span style="color:rgb(185,188,209)">FILE </span>*dst_file<span style="color:rgb(204,120,50)">;
</span><span style="color:rgb(204,120,50)"> int </span>dst_bufsize<span style="color:rgb(204,120,50)">;
</span><span style="color:rgb(204,120,50)"> const char </span>*fmt<span style="color:rgb(204,120,50)">;
</span><span style="color:rgb(204,120,50)"> struct </span><span style="color:rgb(181,182,227)">SwrContext </span>*swr_ctx<span style="color:rgb(204,120,50)">;
</span><span style="color:rgb(204,120,50)"> int </span>ret<span style="color:rgb(204,120,50)">;
</span><span style="color:rgb(204,120,50)">
</span><span style="color:rgb(204,120,50)"> </span>dst_file = fopen(dst_filename<span style="color:rgb(204,120,50)">, </span><span style="color:rgb(106,135,89)">"wb"</span>)<span style="color:rgb(204,120,50)">;
</span><span style="color:rgb(204,120,50)"> if </span>(!dst_file) {
fprintf(<span style="color:rgb(144,139,37)">stderr</span><span style="color:rgb(204,120,50)">, </span><span style="color:rgb(106,135,89)">"Could not open destination file %s</span><span style="color:rgb(204,120,50)">\n</span><span style="color:rgb(106,135,89)">"</span><span style="color:rgb(204,120,50)">, </span>dst_filename)<span style="color:rgb(204,120,50)">;
</span><span style="color:rgb(204,120,50)"> </span>exit(<span style="color:rgb(104,151,187)">1</span>)<span style="color:rgb(204,120,50)">;
</span><span style="color:rgb(204,120,50)"> </span>}
swr_ctx = swr_alloc()<span style="color:rgb(204,120,50)">;
</span><span style="color:rgb(204,120,50)"> if </span>(!swr_ctx) {
fprintf(<span style="color:rgb(144,139,37)">stderr</span><span style="color:rgb(204,120,50)">, </span><span style="color:rgb(106,135,89)">"Could not allocate resampler context</span><span style="color:rgb(204,120,50)">\n</span><span style="color:rgb(106,135,89)">"</span>)<span style="color:rgb(204,120,50)">;
</span><span style="color:rgb(204,120,50)"> </span>ret = <span style="color:rgb(144,139,37)">AVERROR</span>(ENOMEM)<span style="color:rgb(204,120,50)">;
</span><span style="color:rgb(128,128,128)">// goto end;
</span><span style="color:rgb(128,128,128)"> </span>}
<span style="color:rgb(128,128,128)">/* set in options */
</span><span style="color:rgb(128,128,128)"> </span>av_opt_set_int(swr_ctx<span style="color:rgb(204,120,50)">, </span><span style="color:rgb(106,135,89)">"in_channel_layout"</span><span style="color:rgb(204,120,50)">, </span>src_ch_layout<span style="color:rgb(204,120,50)">, </span><span style="color:rgb(104,151,187)">0</span>)<span style="color:rgb(204,120,50)">;
</span><span style="color:rgb(204,120,50)"> </span>av_opt_set_int(swr_ctx<span style="color:rgb(204,120,50)">, </span><span style="color:rgb(106,135,89)">"in_sample_rate"</span><span style="color:rgb(204,120,50)">, </span>src_rate<span style="color:rgb(204,120,50)">, </span><span style="color:rgb(104,151,187)">0</span>)<span style="color:rgb(204,120,50)">;
</span><span style="color:rgb(204,120,50)"> </span>av_opt_set_sample_fmt(swr_ctx<span style="color:rgb(204,120,50)">, </span><span style="color:rgb(106,135,89)">"in_sample_fmt"</span><span style="color:rgb(204,120,50)">, </span>src_sample_fmt<span style="color:rgb(204,120,50)">, </span><span style="color:rgb(104,151,187)">0</span>)<span style="color:rgb(204,120,50)">;
</span><span style="color:rgb(204,120,50)"> </span><span style="color:rgb(128,128,128)">/* set out options */
</span><span style="color:rgb(128,128,128)"> </span>av_opt_set_int(swr_ctx<span style="color:rgb(204,120,50)">, </span><span style="color:rgb(106,135,89)">"out_channel_layout"</span><span style="color:rgb(204,120,50)">, </span>dst_ch_layout<span style="color:rgb(204,120,50)">, </span><span style="color:rgb(104,151,187)">0</span>)<span style="color:rgb(204,120,50)">;
</span><span style="color:rgb(204,120,50)"> </span>av_opt_set_int(swr_ctx<span style="color:rgb(204,120,50)">, </span><span style="color:rgb(106,135,89)">"out_sample_rate"</span><span style="color:rgb(204,120,50)">, </span>dst_rate<span style="color:rgb(204,120,50)">, </span><span style="color:rgb(104,151,187)">0</span>)<span style="color:rgb(204,120,50)">;
</span><span style="color:rgb(204,120,50)"> </span>av_opt_set_sample_fmt(swr_ctx<span style="color:rgb(204,120,50)">, </span><span style="color:rgb(106,135,89)">"out_sample_fmt"</span><span style="color:rgb(204,120,50)">, </span>dst_sample_fmt<span style="color:rgb(204,120,50)">, </span><span style="color:rgb(104,151,187)">0</span>)<span style="color:rgb(204,120,50)">;
</span><span style="color:rgb(204,120,50)">
</span><span style="color:rgb(204,120,50)"> </span><span style="color:rgb(128,128,128)">/* initialize the resampling context */
</span><span style="color:rgb(128,128,128)"> </span><span style="color:rgb(204,120,50)">if </span>((ret = swr_init(swr_ctx)) < <span style="color:rgb(104,151,187)">0</span>) {
fprintf(<span style="color:rgb(144,139,37)">stderr</span><span style="color:rgb(204,120,50)">, </span><span style="color:rgb(106,135,89)">"Failed to initialize the resampling context</span><span style="color:rgb(204,120,50)">\n</span><span style="color:rgb(106,135,89)">"</span>)<span style="color:rgb(204,120,50)">;
</span><span style="color:rgb(128,128,128)">// goto end;
</span><span style="color:rgb(128,128,128)"> </span>}
<span style="color:rgb(128,128,128)">/* Define nb channels */
</span><span style="color:rgb(128,128,128)"> </span>src_nb_channels = av_get_channel_layout_nb_channels(src_ch_layout)<span style="color:rgb(204,120,50)">;
</span><span style="color:rgb(204,120,50)"> </span>dst_nb_channels = av_get_channel_layout_nb_channels(dst_ch_layout)<span style="color:rgb(204,120,50)">;
</span><span style="color:rgb(204,120,50)"> </span><span style="color:rgb(128,128,128)">// Define ouput nb samples
</span><span style="color:rgb(128,128,128)"> </span>dst_nb_samples = av_rescale_rnd(src_nb_samples<span style="color:rgb(204,120,50)">, </span>dst_rate<span style="color:rgb(204,120,50)">, </span>src_rate<span style="color:rgb(204,120,50)">, </span><span style="color:rgb(152,118,170);font-style:italic">AV_ROUND_UP</span>)<span style="color:rgb(204,120,50)">;
</span><span style="color:rgb(204,120,50)"> </span>ret = av_samples_alloc_array_and_samples(&src_data<span style="color:rgb(204,120,50)">, </span>&src_linesize<span style="color:rgb(204,120,50)">, </span>src_nb_channels<span style="color:rgb(204,120,50)">, </span>src_nb_samples<span style="color:rgb(204,120,50)">, </span>src_sample_fmt<span style="color:rgb(204,120,50)">, </span><span style="color:rgb(104,151,187)">0</span>)<span style="color:rgb(204,120,50)">;
</span><span style="color:rgb(204,120,50)"> if </span>(ret < <span style="color:rgb(104,151,187)">0</span>) {
fprintf(<span style="color:rgb(144,139,37)">stderr</span><span style="color:rgb(204,120,50)">, </span><span style="color:rgb(106,135,89)">"Could not allocate source samples</span><span style="color:rgb(204,120,50)">\n</span><span style="color:rgb(106,135,89)">"</span>)<span style="color:rgb(204,120,50)">;
</span><span style="color:rgb(128,128,128)">// goto end;
</span><span style="color:rgb(128,128,128)"> </span>}
ret = av_samples_alloc_array_and_samples(&dst_data<span style="color:rgb(204,120,50)">, </span>&dst_linesize<span style="color:rgb(204,120,50)">, </span>dst_nb_channels<span style="color:rgb(204,120,50)">, </span>dst_nb_samples<span style="color:rgb(204,120,50)">, </span>dst_sample_fmt<span style="color:rgb(204,120,50)">, </span><span style="color:rgb(104,151,187)">0</span>)<span style="color:rgb(204,120,50)">;
</span><span style="color:rgb(204,120,50)"> if </span>(ret < <span style="color:rgb(104,151,187)">0</span>) {
fprintf(<span style="color:rgb(144,139,37)">stderr</span><span style="color:rgb(204,120,50)">, </span><span style="color:rgb(106,135,89)">"Could not allocate destination samples</span><span style="color:rgb(204,120,50)">\n</span><span style="color:rgb(106,135,89)">"</span>)<span style="color:rgb(204,120,50)">;
</span><span style="color:rgb(128,128,128)">// goto end;
</span><span style="color:rgb(128,128,128)"> </span>}
<span style="color:rgb(128,128,128)">// Fill source samples buffer with A-law samples
</span><span style="color:rgb(128,128,128)"> </span><span style="color:rgb(204,120,50)">unsigned int </span>i = <span style="color:rgb(104,151,187)">0</span><span style="color:rgb(204,120,50)">;
</span><span style="color:rgb(204,120,50)"> </span><span style="color:rgb(181,182,227)">std</span>::for_each(<span style="color:rgb(204,120,50)">this</span>-><span style="color:rgb(147,115,165)">_test1</span>.begin()<span style="color:rgb(204,120,50)">, this</span>-><span style="color:rgb(147,115,165)">_test1</span>.end()<span style="color:rgb(204,120,50)">, </span>[<span style="color:rgb(204,120,50)">this, </span>&src_data<span style="color:rgb(204,120,50)">, </span>&i](<span style="color:rgb(204,120,50)">const </span><span style="color:rgb(185,188,209)">uint8_t </span>&data) {
src_data[<span style="color:rgb(104,151,187)">0</span>][i++] = data<span style="color:rgb(204,120,50)">;
</span><span style="color:rgb(204,120,50)"> </span>})<span style="color:rgb(204,120,50)">;
</span><span style="color:rgb(128,128,128)">
</span><span style="color:rgb(128,128,128)"> /* convert to destination format */
</span><span style="color:rgb(128,128,128)"> </span>ret = swr_convert(swr_ctx<span style="color:rgb(204,120,50)">, </span>dst_data<span style="color:rgb(204,120,50)">, </span>dst_nb_samples<span style="color:rgb(204,120,50)">, </span>(<span style="color:rgb(204,120,50)">const </span><span style="color:rgb(185,188,209)">uint8_t </span>**)src_data<span style="color:rgb(204,120,50)">, </span>src_nb_samples)<span style="color:rgb(204,120,50)">;
</span><span style="color:rgb(204,120,50)"> if </span>(ret < <span style="color:rgb(104,151,187)">0</span>) {
fprintf(<span style="color:rgb(144,139,37)">stderr</span><span style="color:rgb(204,120,50)">, </span><span style="color:rgb(106,135,89)">"Error while converting</span><span style="color:rgb(204,120,50)">\n</span><span style="color:rgb(106,135,89)">"</span>)<span style="color:rgb(204,120,50)">;
</span><span style="color:rgb(204,120,50)"> </span><span style="color:rgb(128,128,128)">// </span><span style="color:rgb(168,192,35);font-style:italic">TODO: handle error
</span><span style="color:rgb(168,192,35);font-style:italic"> </span>}
dst_bufsize = av_samples_get_buffer_size(&dst_linesize<span style="color:rgb(204,120,50)">, </span>dst_nb_channels<span style="color:rgb(204,120,50)">, </span>ret<span style="color:rgb(204,120,50)">, </span>dst_sample_fmt<span style="color:rgb(204,120,50)">, </span><span style="color:rgb(104,151,187)">1</span>)<span style="color:rgb(204,120,50)">;
</span><span style="color:rgb(204,120,50)"> if </span>(dst_bufsize < <span style="color:rgb(104,151,187)">0</span>) {
fprintf(<span style="color:rgb(144,139,37)">stderr</span><span style="color:rgb(204,120,50)">, </span><span style="color:rgb(106,135,89)">"Could not get sample buffer size</span><span style="color:rgb(204,120,50)">\n</span><span style="color:rgb(106,135,89)">"</span>)<span style="color:rgb(204,120,50)">;
</span><span style="color:rgb(204,120,50)"> </span><span style="color:rgb(128,128,128)">// </span><span style="color:rgb(168,192,35);font-style:italic">TODO: handle error
</span><span style="color:rgb(168,192,35);font-style:italic"> </span>}
<span style="color:rgb(128,128,128)">// Write resampled data into file
</span><span style="color:rgb(128,128,128)"> </span>fwrite(dst_data[<span style="color:rgb(104,151,187)">0</span>]<span style="color:rgb(204,120,50)">, </span><span style="color:rgb(104,151,187)">1</span><span style="color:rgb(204,120,50)">, </span>dst_bufsize<span style="color:rgb(204,120,50)">, </span>dst_file)<span style="color:rgb(204,120,50)">;
</span><span style="color:rgb(204,120,50)"> if </span>((ret = get_format_from_sample_fmt(&fmt<span style="color:rgb(204,120,50)">, </span>dst_sample_fmt)) < <span style="color:rgb(104,151,187)">0</span>) {
fprintf(<span style="color:rgb(144,139,37)">stderr</span><span style="color:rgb(204,120,50)">, </span><span style="color:rgb(106,135,89)">"Resampling failed.</span><span style="color:rgb(204,120,50)">\n</span><span style="color:rgb(106,135,89)">"</span>)<span style="color:rgb(204,120,50)">;
</span><span style="color:rgb(204,120,50)"> </span><span style="color:rgb(128,128,128)">// </span><span style="color:rgb(168,192,35);font-style:italic">TODO: handle error
</span><span style="color:rgb(168,192,35);font-style:italic"> </span>}
<span style="color:rgb(128,128,128)">// Close out file
</span><span style="color:rgb(128,128,128)"> </span>fclose(dst_file)<span style="color:rgb(204,120,50)">;
</span><span style="color:rgb(204,120,50)">
</span><span style="color:rgb(204,120,50)"> </span><span style="color:rgb(128,128,128)">// Release memory
</span><span style="color:rgb(128,128,128)"> </span><span style="color:rgb(204,120,50)">if </span>(src_data) av_freep(&src_data[<span style="color:rgb(104,151,187)">0</span>])<span style="color:rgb(204,120,50)">;
</span><span style="color:rgb(204,120,50)"> </span>av_freep(&src_data)<span style="color:rgb(204,120,50)">;
</span><span style="color:rgb(204,120,50)"> if </span>(dst_data) av_freep(&dst_data[<span style="color:rgb(104,151,187)">0</span>])<span style="color:rgb(204,120,50)">;
</span><span style="color:rgb(204,120,50)"> </span>av_freep(&dst_data)<span style="color:rgb(204,120,50)">;
</span><span style="color:rgb(204,120,50)"> </span>swr_free(&swr_ctx)<span style="color:rgb(204,120,50)">;</span></pre>
</div>
<div>When dst_rate is equal to src_rate, the output is OK
without any noise.</div>
<div>However, when dst_rate is lower than src_rate, the audio is
awful with too much noise.</div>
<div><br>
</div>
<div>Did I miss something or am I doing something wrong?<br>
<br>
Yours sincerely,</div>
<div>Julien BAUMGARTEN</div>
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