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<h3>
PulseAudio Marge Bot pushed to branch master
at <a href="https://gitlab.freedesktop.org/pulseaudio/pulseaudio">PulseAudio / pulseaudio</a>
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<h4>
Commits:
</h4>
<ul>
<li>
<strong><a href="https://gitlab.freedesktop.org/pulseaudio/pulseaudio/-/commit/7e9e9e271aebb801a9fd8abe2489f95604c35bc5">7e9e9e27</a></strong>
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<span>by Igor V. Kovalenko</span>
<i>at 2021-01-21T15:16:19+00:00</i>
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<pre class="commit-message" style="white-space: pre-wrap; margin: 0;">bluetooth: allow increasing SBC output bitrate
SBC codec decrements bitpool value by fixed amount each time it is asked to
reduce output bitrate. This results in reduced audio quality with SBC codec.
Implement increase_encoder_bitrate for SBC codec by adding 1 to bitpool value
each time encoder bitrate needs to be increased to restore SBC audio quality.
While at it, remove bitpool decrement limit to use connection agreed value
instead as we will be able to restore quality later.
Part-of: <https://gitlab.freedesktop.org/pulseaudio/pulseaudio/-/merge_requests/474>
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<h4>1 changed file:</h4>
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<a href="#77b6c205454537e9383387f41ee4e14a047a0d46">
src/modules/bluetooth/a2dp-codec-sbc.c
</a>
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<h4>Changes:</h4>
<li id="77b6c205454537e9383387f41ee4e14a047a0d46">
<a href="https://gitlab.freedesktop.org/pulseaudio/pulseaudio/-/commit/7e9e9e271aebb801a9fd8abe2489f95604c35bc5#77b6c205454537e9383387f41ee4e14a047a0d46"><strong>src/modules/bluetooth/a2dp-codec-sbc.c</strong></a>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -36,8 +36,8 @@</td>
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<pre style="margin: 0;"> <span id="LC36" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#include "a2dp-codec-api.h"</span></span>
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<pre style="margin: 0;"> <span id="LC37" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#include "rtp.h"</span></span>
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<pre style="margin: 0;"> <span id="LC38" class="line" lang="c"></span>
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<pre style="margin: 0;">-<span id="LC39" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#define SBC_BITPOOL_DEC_LIMIT 32</span></span>
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<pre style="margin: 0;"> <span id="LC39" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#define SBC_BITPOOL_DEC_STEP 5</span></span>
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<pre style="margin: 0;">+<span id="LC40" class="line" lang="c"><span class="cp" style="color: #999; font-weight: 600;">#define SBC_BITPOOL_INC_STEP 1</span></span>
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<pre style="margin: 0;"> <span id="LC41" class="line" lang="c"></span>
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<pre style="margin: 0;"> <span id="LC42" class="line" lang="c"><span class="k" style="font-weight: 600;">struct</span> <span class="n" style="color: #333;">sbc_info</span> <span class="p">{</span></span>
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<pre style="margin: 0;"> <span id="LC43" class="line" lang="c"> <span class="n" style="color: #333;">sbc_t</span> <span class="n" style="color: #333;">sbc</span><span class="p">;</span> <span class="cm" style="color: #998; font-style: italic;">/* Codec data */</span></span>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -503,14 +503,20 @@ static size_t reduce_encoder_bitrate(void *codec_info, size_t write_link_mtu) {</td>
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<pre style="margin: 0;"> <span id="LC503" class="line" lang="c"> <span class="k" style="font-weight: 600;">struct</span> <span class="n" style="color: #333;">sbc_info</span> <span class="o" style="font-weight: 600;">*</span><span class="n" style="color: #333;">sbc_info</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="k" style="font-weight: 600;">struct</span> <span class="n" style="color: #333;">sbc_info</span> <span class="o" style="font-weight: 600;">*</span><span class="p">)</span> <span class="n" style="color: #333;">codec_info</span><span class="p">;</span></span>
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<pre style="margin: 0;"> <span id="LC504" class="line" lang="c"> <span class="kt" style="color: #458; font-weight: 600;">uint8_t</span> <span class="n" style="color: #333;">bitpool</span><span class="p">;</span></span>
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<pre style="margin: 0;"> <span id="LC505" class="line" lang="c"></span>
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<pre style="margin: 0;">-<span id="LC506" class="line" lang="c"> <span class="cm" style="color: #998; font-style: italic;">/* Check if bitpool is already at its limit */</span></span>
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507
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<pre style="margin: 0;">-<span id="LC507" class="line" lang="c"> <span class="k" style="font-weight: 600;">if</span> <span class="p">(</span><span class="n" style="color: #333;">sbc_info</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">sbc</span><span class="p">.</span><span class="n" style="color: #333;">bitpool</span> <span class="o" style="font-weight: 600;"><=</span> <span class="n" style="color: #333;">SBC_BITPOOL_DEC_LIMIT</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC506" class="line" lang="c"> <span class="n" style="color: #333;">bitpool</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">PA_MAX</span><span class="p">(</span><span class="n" style="color: #333;">sbc_info</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">sbc</span><span class="p">.</span><span class="n" style="color: #333;">bitpool</span> <span class="o" style="font-weight: 600;">-</span> <span class="n" style="color: #333;">SBC_BITPOOL_DEC_STEP</span><span class="p">,</span> <span class="n" style="color: #333;">sbc_info</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">min_bitpool</span><span class="p">);</span></span>
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<pre style="margin: 0;">+<span id="LC507" class="line" lang="c"></span>
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<pre style="margin: 0;">+<span id="LC508" class="line" lang="c"> <span class="k" style="font-weight: 600;">if</span> <span class="p">(</span><span class="n" style="color: #333;">sbc_info</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">sbc</span><span class="p">.</span><span class="n" style="color: #333;">bitpool</span> <span class="o" style="font-weight: 600;">==</span> <span class="n" style="color: #333;">bitpool</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC509" class="line" lang="c"> <span class="k" style="font-weight: 600;">return</span> <span class="mi" style="color: #099;">0</span><span class="p">;</span></span>
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<pre style="margin: 0;"> <span id="LC510" class="line" lang="c"></span>
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<pre style="margin: 0;">-<span id="LC510" class="line" lang="c"> <span class="n" style="color: #333;">bitpool</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">sbc_info</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">sbc</span><span class="p">.</span><span class="n" style="color: #333;">bitpool</span> <span class="o" style="font-weight: 600;">-</span> <span class="n" style="color: #333;">SBC_BITPOOL_DEC_STEP</span><span class="p">;</span></span>
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<pre style="margin: 0;">+<span id="LC511" class="line" lang="c"> <span class="n" style="color: #333;">set_bitpool</span><span class="p">(</span><span class="n" style="color: #333;">sbc_info</span><span class="p">,</span> <span class="n" style="color: #333;">bitpool</span><span class="p">);</span></span>
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<pre style="margin: 0;">+<span id="LC512" class="line" lang="c"> <span class="k" style="font-weight: 600;">return</span> <span class="n" style="color: #333;">get_block_size</span><span class="p">(</span><span class="n" style="color: #333;">codec_info</span><span class="p">,</span> <span class="n" style="color: #333;">write_link_mtu</span><span class="p">);</span></span>
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<pre style="margin: 0;">+<span id="LC513" class="line" lang="c"><span class="p">}</span></span>
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<pre style="margin: 0;">+<span id="LC514" class="line" lang="c"></span>
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<pre style="margin: 0;">+<span id="LC515" class="line" lang="c"><span class="k" style="font-weight: 600;">static</span> <span class="kt" style="color: #458; font-weight: 600;">size_t</span> <span class="nf" style="color: #900; font-weight: 600;">increase_encoder_bitrate</span><span class="p">(</span><span class="kt" style="color: #458; font-weight: 600;">void</span> <span class="o" style="font-weight: 600;">*</span><span class="n" style="color: #333;">codec_info</span><span class="p">,</span> <span class="kt" style="color: #458; font-weight: 600;">size_t</span> <span class="n" style="color: #333;">write_link_mtu</span><span class="p">)</span> <span class="p">{</span></span>
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<pre style="margin: 0;">+<span id="LC516" class="line" lang="c"> <span class="k" style="font-weight: 600;">struct</span> <span class="n" style="color: #333;">sbc_info</span> <span class="o" style="font-weight: 600;">*</span><span class="n" style="color: #333;">sbc_info</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">(</span><span class="k" style="font-weight: 600;">struct</span> <span class="n" style="color: #333;">sbc_info</span> <span class="o" style="font-weight: 600;">*</span><span class="p">)</span> <span class="n" style="color: #333;">codec_info</span><span class="p">;</span></span>
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<pre style="margin: 0;">+<span id="LC517" class="line" lang="c"> <span class="kt" style="color: #458; font-weight: 600;">uint8_t</span> <span class="n" style="color: #333;">bitpool</span><span class="p">;</span></span>
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518
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<pre style="margin: 0;"> <span id="LC518" class="line" lang="c"></span>
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<pre style="margin: 0;">-<span id="LC512" class="line" lang="c"> <span class="k" style="font-weight: 600;">if</span> <span class="p">(</span><span class="n" style="color: #333;">bitpool</span> <span class="o" style="font-weight: 600;"><</span> <span class="n" style="color: #333;">SBC_BITPOOL_DEC_LIMIT</span><span class="p">)</span></span>
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<pre style="margin: 0;">-<span id="LC513" class="line" lang="c"> <span class="n" style="color: #333;">bitpool</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">SBC_BITPOOL_DEC_LIMIT</span><span class="p">;</span></span>
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<pre style="margin: 0;">+<span id="LC519" class="line" lang="c"> <span class="n" style="color: #333;">bitpool</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">PA_MIN</span><span class="p">(</span><span class="n" style="color: #333;">sbc_info</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">sbc</span><span class="p">.</span><span class="n" style="color: #333;">bitpool</span> <span class="o" style="font-weight: 600;">+</span> <span class="n" style="color: #333;">SBC_BITPOOL_INC_STEP</span><span class="p">,</span> <span class="n" style="color: #333;">sbc_info</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">max_bitpool</span><span class="p">);</span></span>
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<pre style="margin: 0;"> <span id="LC520" class="line" lang="c"></span>
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<pre style="margin: 0;"> <span id="LC521" class="line" lang="c"> <span class="k" style="font-weight: 600;">if</span> <span class="p">(</span><span class="n" style="color: #333;">sbc_info</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">sbc</span><span class="p">.</span><span class="n" style="color: #333;">bitpool</span> <span class="o" style="font-weight: 600;">==</span> <span class="n" style="color: #333;">bitpool</span><span class="p">)</span></span>
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<pre style="margin: 0;"> <span id="LC522" class="line" lang="c"> <span class="k" style="font-weight: 600;">return</span> <span class="mi" style="color: #099;">0</span><span class="p">;</span></span>
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<td class="diff-line-num unfold js-unfold old_line" data-linenumber="682" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #f0f0f0; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#fafafa">...</td>
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<td class="line_content match " style="padding-left: 0.5em; padding-right: 0.5em; color: rgba(0,0,0,0.3);" bgcolor="#fafafa">@@ -682,6 +688,7 @@ const pa_a2dp_codec pa_a2dp_codec_sbc = {</td>
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682
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<pre style="margin: 0;"> <span id="LC688" class="line" lang="c"> <span class="p">.</span><span class="n" style="color: #333;">get_read_block_size</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">get_block_size</span><span class="p">,</span></span>
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683
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689
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<pre style="margin: 0;"> <span id="LC689" class="line" lang="c"> <span class="p">.</span><span class="n" style="color: #333;">get_write_block_size</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">get_block_size</span><span class="p">,</span></span>
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684
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<pre style="margin: 0;"> <span id="LC690" class="line" lang="c"> <span class="p">.</span><span class="n" style="color: #333;">reduce_encoder_bitrate</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">reduce_encoder_bitrate</span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC691" class="line" lang="c"> <span class="p">.</span><span class="n" style="color: #333;">increase_encoder_bitrate</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">increase_encoder_bitrate</span><span class="p">,</span></span>
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685
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692
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<pre style="margin: 0;"> <span id="LC692" class="line" lang="c"> <span class="p">.</span><span class="n" style="color: #333;">encode_buffer</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">encode_buffer</span><span class="p">,</span></span>
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<pre style="margin: 0;"> <span id="LC693" class="line" lang="c"> <span class="p">.</span><span class="n" style="color: #333;">decode_buffer</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">decode_buffer</span><span class="p">,</span></span>
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694
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<pre style="margin: 0;"> <span id="LC694" class="line" lang="c"><span class="p">};</span></span></pre>
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