Commit Graph

7 Commits

Author SHA1 Message Date
Kongqun Yang 1af8f04e40 Rename webm_subsample_encryption flag to vp9_subsample_encryption
This is what webm_subsample_encryption flag actually does.

- Fixes the flag not working problem introduced by previous CLs.
- Also mark flag webm_subsample_encryption as deprecated.

Closes #220

Change-Id: I03ff843786572a91c01b8bd346a3ce50b129118f
2017-03-30 20:36:43 +00:00
Kongqun Yang 277c5b23c0 Allow generating avc3 / hev1 from TS and Wvm files
Added a flag --strip_parameter_set_nalus. When enabled, parameter
set NAL units, SPS/PPS for H264 and SPS/PPS/VPS for H265, are stripped
from frames when converting NAL byte stream (AnnexB stream) to NAL
unit stream, which generates avc1/hvc1; otherwise they are not
stripped, and avc3/hev1 is generated.

Parameter set NAL units should not be stripped if they are varying
in the frames otherwise the frames may fail to be decoded.

The flag is enabled by default as we don't usually see varying
SPS/PPS/VPS and it is more space efficient with them stripped.

Set --strip_parameter_set_nalus=false to disable the flag if there
are varying SPS/PPS/VPS in the frames. This addresses #206.

Change-Id: I34bde6f33069f9f77d51a510b39f58a0f0e141aa
2017-03-23 13:53:14 -07:00
Kongqun Yang d323d4f091 Fix break in Windows (#213) 2017-03-22 09:57:18 -07:00
KongQun Yang b09c8f6521 Update EncryptionHandler to support key rotation and SampleAes
This CL also removes EncryptionConfig stream data type and merges it
into StreamInfo/SegmentInfo instead.

Change-Id: Idb70ce503e61d3c951225cc78b6b15c084e16dcd
2017-03-21 23:50:53 +00:00
Kongqun Yang b891e0271e Make CENC behavior of VP8/9 in ISO-BMFF the same as in WebM
- Disable subsample encryption for VP8 in ISO-BMFF
- Apply block alignment to all subsamples for VP9 in ISO-BMFF,
  instead of just superframes.

Change-Id: I8dd31cc16e87abc4d538330eaff9acb0509497df
2017-03-21 23:12:57 +00:00
Kongqun Yang 9990524f98 Implement ChunkingHandler
This handler is a multi-in multi-out handler. If more than one input is
provided, there should be one and only one video stream; also, all inputs
should come from the same thread and are synchronized.
There can be multiple chunking handler running in different threads or even
different processes, we use the "consistent chunking algorithm" to make sure
the chunks in different streams are aligned without explicit communcating
with each other - which is not efficient and often difficult.

Consistent Chunking Algorithm:
 1. Find the consistent chunkable boundary
 Let the timestamps for video frames be (t1, t2, t3, ...). Then a
 consistent chunkable boundary is simply the first chunkable boundary after
 (tk / N) != (tk-1 / N), where '/' denotes integer division, and N is the
 intended chunk duration.
 2. Chunk only at the consistent chunkable boundary

This algorithm will make sure the chunks from different video streams are
aligned if they have aligned GoPs. However, this algorithm will only work
for video streams. To be able to chunk non video streams at similar
positions as video streams, ChunkingHandler is designed to accept one video
input and multiple non video inputs, the non video inputs are chunked when
the video input is chunked. If the inputs are synchronized - which is true
if the inputs come from the same demuxer, the video and non video chunks
are aligned.

Change-Id: Id3bad51ab14f311efdb8713b6cd36d36cf9e4639
2017-02-11 02:41:34 +00:00
Kongqun Yang 7a90ee70ab Implement EncryptionHandler
Change-Id: Iabedf3b02057d6124d5393ae9618490e5595ad89
2017-02-11 01:21:28 +00:00