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<a href="unionVAConfigAttribValEncRateControlExt-members.html">List of all members</a> </div>
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<div class="title">VAConfigAttribValEncRateControlExt Union Reference<div class="ingroups"><a class="el" href="group__api__core.html">Core API</a></div></div> </div>
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<p>Attribute value for VAConfigAttribEncRateControlExt.
<a href="unionVAConfigAttribValEncRateControlExt.html#details">More...</a></p>
<p><code>#include <<a class="el" href="va_8h_source.html">va.h</a>></code></p>
<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
<div class="textblock"><p>Attribute value for VAConfigAttribEncRateControlExt. </p>
</div><h2 class="groupheader">Member Data Documentation</h2>
<a id="ae44185f23cd56edde7a220362f65a9ae"></a>
<h2 class="memtitle"><span class="permalink"><a href="#ae44185f23cd56edde7a220362f65a9ae">◆ </a></span>max_num_temporal_layers_minus1</h2>
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<td class="memname">uint32_t VAConfigAttribValEncRateControlExt::max_num_temporal_layers_minus1</td>
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<p>The maximum number of temporal layers minus 1. </p>
<p><a class="el" href="unionVAConfigAttribValEncRateControlExt.html#ae44185f23cd56edde7a220362f65a9ae">max_num_temporal_layers_minus1</a> plus 1 specifies the maximum number of temporal layers that supported by the underlying driver. <a class="el" href="unionVAConfigAttribValEncRateControlExt.html#ae44185f23cd56edde7a220362f65a9ae">max_num_temporal_layers_minus1</a> equal to 0 implies the underlying driver doesn't support encoding with temporal layer. </p>
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<h2 class="memtitle"><span class="permalink"><a href="#a208a830a1fed195c31e1e9d646c6c437">◆ </a></span>temporal_layer_bitrate_control_flag</h2>
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<td class="memname">uint32_t VAConfigAttribValEncRateControlExt::temporal_layer_bitrate_control_flag</td>
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<p>/brief support temporal layer bit-rate control flag</p>
<p><a class="el" href="unionVAConfigAttribValEncRateControlExt.html#a208a830a1fed195c31e1e9d646c6c437">temporal_layer_bitrate_control_flag</a> equal to 1 specifies the underlying driver can support bit-rate control per temporal layer when (#VAConfigAttribRateControl == <a class="el" href="group__api__core.html#gaa57577c08c899f30861ef30a9579c6e1" title="Constant bitrate. ">VA_RC_CBR</a> || #VAConfigAttribRateControl == <a class="el" href="group__api__core.html#ga2ada19db3fc9a6f9d936c3998bb2f9a1" title="Variable bitrate. ">VA_RC_VBR</a>).</p>
<p>The underlying driver must set <a class="el" href="unionVAConfigAttribValEncRateControlExt.html#a208a830a1fed195c31e1e9d646c6c437">temporal_layer_bitrate_control_flag</a> to 0 when <code>max_num_temporal_layers_minus1</code> is equal to 0</p>
<p>To use bit-rate control per temporal layer, an application must send the right layer structure via <a class="el" href="structVAEncMiscParameterTemporalLayerStructure.html" title="Temporal layer Structure. ">VAEncMiscParameterTemporalLayerStructure</a> at the beginning of a coded sequence and then followed by <a class="el" href="structVAEncMiscParameterRateControl.html" title="Rate control parameters. ">VAEncMiscParameterRateControl</a> and <a class="el" href="structVAEncMiscParameterFrameRate.html">VAEncMiscParameterFrameRate</a> structures for each layer, using the <code>temporal_id</code> field as the layer identifier. Otherwise the driver doesn't use bitrate control per temporal layer if an application doesn't send the layer structure via <a class="el" href="structVAEncMiscParameterTemporalLayerStructure.html" title="Temporal layer Structure. ">VAEncMiscParameterTemporalLayerStructure</a> to the driver. The driver returns VA_STATUS_ERROR_INVALID_PARAMETER if an application sends a wrong layer structure or doesn't send <a class="el" href="structVAEncMiscParameterRateControl.html" title="Rate control parameters. ">VAEncMiscParameterRateControl</a> and <a class="el" href="structVAEncMiscParameterFrameRate.html">VAEncMiscParameterFrameRate</a> for each layer.</p>
<p>The driver will ignore <a class="el" href="structVAEncMiscParameterTemporalLayerStructure.html" title="Temporal layer Structure. ">VAEncMiscParameterTemporalLayerStructure</a> and the <code>temporal_id</code> field in <a class="el" href="structVAEncMiscParameterRateControl.html" title="Rate control parameters. ">VAEncMiscParameterRateControl</a> and <a class="el" href="structVAEncMiscParameterFrameRate.html">VAEncMiscParameterFrameRate</a> if <a class="el" href="unionVAConfigAttribValEncRateControlExt.html#a208a830a1fed195c31e1e9d646c6c437">temporal_layer_bitrate_control_flag</a> is equal to 0 or #VAConfigAttribRateControl == <a class="el" href="group__api__core.html#ga6efd5a7ec33229f63fae20d65c53dc7f" title="Constant QP. ">VA_RC_CQP</a> </p>
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