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<blockquote data-quote="mm1352000" data-source="post: 1144590" data-attributes="member: 82144">Yes, exactly... at least in some (most?) cases.For example...In DVB, the component_descriptor() (ETSI EN 300 468 section 6.2.8) there are stream_content and component_type fields which usually specify this information. For example:<ul>
<li data-xf-list-type="ul">SC = 0x6 and CT = 0x5 means surround sound HE-AAC</li>
<li data-xf-list-type="ul">SC = 0x4 means AC-3 or E-AC-3; the MSB of CT indicates AC-3 or E-AC-3; the 3 LSB of CT indicate the channel config (eg. 3 = 2 channel surround encoded, 4 = multi-channel &gt; 2 channels, 5 = multi-channel &gt; 5.1 channels); refer to annex D section D1</li>
<li data-xf-list-type="ul">SC = 0x7 means DTS or DTS HD; the 3 LSB of CT indicate the channel config (eg. 4 = multi-channel &gt; 2 channels); refer to annex G section G3.4</li>
</ul>In the ATSC AC-3_audio_stream_descriptor() (ATSC A/52 annex A section A4.3) there is a num_channels field. According to A/65 this descriptor is mandatory in the PMT.In the ATSC E-AC-3_descriptor() (ATSC A/52 annex G section G3.5) there is a number_of_channels field. According to A/65 this descriptor is mandatory in the PMT.</blockquote>

[QUOTE="mm1352000, post: 1144590, member: 82144"] Yes, exactly... at least in some (most?) cases. For example... In DVB, the component_descriptor() (ETSI EN 300 468 section 6.2.8) there are stream_content and component_type fields which usually specify this information. For example: [LIST] [*]SC = 0x6 and CT = 0x5 means surround sound HE-AAC [*]SC = 0x4 means AC-3 or E-AC-3; the MSB of CT indicates AC-3 or E-AC-3; the 3 LSB of CT indicate the channel config (eg. 3 = 2 channel surround encoded, 4 = multi-channel > 2 channels, 5 = multi-channel > 5.1 channels); refer to annex D section D1 [*]SC = 0x7 means DTS or DTS HD; the 3 LSB of CT indicate the channel config (eg. 4 = multi-channel > 2 channels); refer to annex G section G3.4 [/LIST] In the ATSC AC-3_audio_stream_descriptor() (ATSC A/52 annex A section A4.3) there is a num_channels field. According to A/65 this descriptor is mandatory in the PMT. In the ATSC E-AC-3_descriptor() (ATSC A/52 annex G section G3.5) there is a number_of_channels field. According to A/65 this descriptor is mandatory in the PMT. [/QUOTE]

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