H26x parser start code fixes

This branch fixes start code issues in H264 and H265 parsers.

Fixes #1287 (closed)

TODO

• Set ts offset in H265 parser too
• Add a unit test for the case in issue #1287 (closed)

added Blocker label

added 2 commits

• 05b76be7 - h264parse: Properly handle 4 bytes start code
• 3257194a - h264parser: Removed impossible error case

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added 2 commits

• c65115bb - h264parse: Properly handle 4 bytes start code
• 74a7d053 - h264parser: Removed impossible error case

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added 2 commits

• d6cdc473 - fixup! h264parse: Properly handle 4 bytes start code
• 9488908f - h265parse: Ensure correct timestamps

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added 3 commits

• e321a519 - h264parse: Properly handle 4 bytes start code
• a7003072 - h264parser: Removed impossible error case
• 0b4f2a40 - h265parse: Ensure correct timestamps

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added 2 commits

• add218d0 - h264/h265parse: Fix initial skip
• 5dc3647f - test: h264/h265: Add test for four bytes start code initial skip

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marked the checklist item Add a unit test for the case in issue #1287 (closed) as completed

unmarked as a Work In Progress

added 1 commit

• f9467a8e - test: h264/h265: Add test for four bytes start code initial skip

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marked the checklist item Add a unit test for the case in issue #1287 (closed) as incomplete

added 1 commit

• ce4e2c3c - test: h264/h265: Add test for four bytes start code initial skip

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added 2 commits

• 038cf096 - test: h264/h265: Constify all test buffers
• ddfddefe - test: h264/h265: Add test for four bytes start code initial skip

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marked the checklist item Add a unit test for the case in issue #1287 (closed) as completed

Ok, I properly verified that my test covers issue #1287 (closed). This should be near ready to do, just need someone to review.

Hmm, spoke too quickly, need to fix some indentation.

added 9 commits

• cab1ddf4 - 1 commit from branch gstreamer:master
• 3afe3948 - h265parser: Removed impossible error case
• e57dde43 - h265parser: Fix NAL size check for identification
• dbf08084 - h264parse: Properly handle 4 bytes start code
• bd4dca2c - h264parser: Removed impossible error case
• 06fa7027 - h265parse: Ensure correct timestamps
• 2766ef16 - h264/h265parse: Fix initial skip
• a42c2d68 - test: h264/h265: Constify all test buffers
• e48982ef - test: h264/h265: Add test for four bytes start code initial skip

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