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Bug 778118 - mpegts: Can't distinguish extension_descriptor via gst_mpegts_find_descriptor
mpegts: Can't distinguish extension_descriptor via gst_mpegts_find_descriptor
Status: RESOLVED OBSOLETE
Product: GStreamer
Classification: Platform
Component: gst-plugins-bad
git master
Other Mac OS
: Normal normal
: git master
Assigned To: GStreamer Maintainers
GStreamer Maintainers
Depends on:
Blocks:
 
 
Reported: 2017-02-03 05:24 UTC by Gabby Park
Modified: 2018-11-03 14:04 UTC
See Also:
GNOME target: ---
GNOME version: ---


Description Gabby Park 2017-02-03 05:24:31 UTC 
There are extension_descriptor (descriptor_tag == 0x7F, descriptor_tag_extension) in ES loop of PMT(Program Map Table). The decriptor_tag value 0x7F will be shared between extension_descriptor but, our gst_mpegts_find_descriptor() can distinguish depend on only descriptor_tag.
So if there are one more extension_descriptor in same ES loop of PMT, then we only get the first of extension_descriptor.

This specification is about DVB standard. In my opinion, it looks like that we need new function for find descriptor.
I want to hear your feedback.
Thanks.
Comment 1 Gabby Park 2017-02-03 05:30:39 UTC 
I leave sample ES loop info in PMT as below:

stream_type = 0x06 (ISO/IEC 13818-1 PES packets containing private data)
elementary_PID = 0x40
ES_info_length = 41
ES Info:
    descriptor_tag = 0x7F
    descriptor_length = 2
    descriptor_tag_extension = 0x15 (AC-4_descriptor)

    descriptor_tag = 0x52 (Stream identifier descriptor)
    descriptor_length = 1
      component_tag = 64

    descriptor_tag = 0x7F
    descriptor_length = 32
    descriptor_tag_extension = 0x9 (audio_preselection_descriptor)
Comment 2 GStreamer system administrator 2018-11-03 14:04:11 UTC 
-- GitLab Migration Automatic Message --

This bug has been migrated to freedesktop.org's GitLab instance and has been closed from further activity.

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