DTS was used in ChunkingHandler. As a result, SegmentInfo contained
timestamp in DTS. MP4Muxer has a logic to change SegmentInfo to use
PTS but not in other muxers.
Benefits of using PTS in ChunkingHandler:
- De-dup the redundant logic in MP4Muxer
- Ensure consistent behavior in different output containers
- Consistent with other timestamps, e.g. Ad Cue timestamps
Issue #413
Change-Id: Ib671badf144e0c0866d60f4ff0ac0cbbdd33817e
We always assumed that text stream started at zero in the text chunker.
This meant that if the text stream started later than zero (like in a
live stream) we would generate a lot of empty segments.
Instead the text chunker will assume that segments should be adjusted
to align with multiple of segment duration. The text chunker will assume
that an earlier component in the pipeline (i.e. text padder) will ensure
that the first sample has the time that we want to start segments at
(even it needs to add an empty sample).
Issue #416
Change-Id: Ie45844354d6e9448787cae896841b5ab31721ed6
Originally the create and dispatch of stream data in the cue
alignment tests were separate to improve readability. The idea was
to separate building each stream and dispatching the streams muxed
together would make it easier to understand the streams.
However, coming back to the code, this did not hold up as it took just as
long to understand the code. So merging the two together allows for the
code to be more concise.
Change-Id: I77f6bb67e7fb0ca7af0553c3baf07082770da74c
Reduce which variables we check in the cue alignment tests by replacing
the less important variables with "_".
Change-Id: Id8770b5f2045ad5c8ac6eee54d6a291d933a4b6f
Added the key frame field to the IsMediaSample mather. All
tests that do not care about a sample being a keyframe (or not)
have been updated to use "_".
Change-Id: I44180687c58c260b6856e683d647f532227b14d5
Updated all the stream data matcher we use in our unit tests
to allow us to use matchers in them. We are now able to use "_"
to ignore specific parameters.
With this we were able to replace the different version of
matchers for each stream data type with a single instance for
each type.
Includes updates to printing strings to the listener. Strings
now go through a "pretty" function to help make it easier to
read them in the output.
Change-Id: I146351b54fccd63ab9ec936877e6c6b30f9aa9fc
In the cue aligner, we assumed that all text will be in milliseconds.
This was the last place with that assumption. This change removes that
assumption and uses the stream info's time scale.
Issue #399
Change-Id: Ie21bf27148e020bd85111dcace0bbdff3419c1ac
Before, the text chunker would assume that all text streams were in
MS, which is not a safe assumption to make.
This changes it to take the time scale from StreamInfo and work
natively with scaled time units.
This required updating the tests. While doing so the tests were
rewritten with the goal to make them easier to read.
Closes: #399
Change-Id: Ib792ad306f40d749763418cde645337913a6046b
Make the text stream info factory method in media_handler_test_base
require the caller to specify the time scale.
Issue: #399
Change-Id: Ibdfb183e0aa3f4ff50edf6b58c4e9b966006c6d2
The SetUpAndInitialize function returns a status. We were not
asserting that it return an OK status. This change adds the
missing ASSERT_OK calls.
Change-Id: I044f60c0450d46fc0f6495319b1ed7ef8ab6e794
Problem : Text samples have variable length and therefore act
more like continuous samples whereas audio and video
act more like discrete samples. Since we use sample
start time, a cue event could be inserted after the
start time of the last text sample and never get
inserted as there are no more samples.
Change : After all streams have requested flushing, we make sure
to collect all remaining cue events from the sync point
queue and insert them into each stream.
Issue #362
Change-Id: Id8f136f7ef53531f7a7f412613eac352324e0130
In the cue alignment handler, instead of storing just one cue, store
a full queue. This will make it easier to handle text streams that
end before audio and text.
Change-Id: Ida97008fa015639350261bd3f76f4cb901747c66
In the cue aligner, instead of storing the cue event, store a
stream data so that we don't need to know the stream index when
sending the cue event downstream.
Change-Id: Ice27da021fad2872e2a23975b959630a9d43b736
To make it easier to understand what a video stream and a non
video streams is doing in the cue aligner, each stream type is
given their own functions.
Change-Id: I8b8ca403721bcb06ca3056004420902667a30f6c
Use a common hint for all stream states as the hint is always
updated when we get a new cue event. Cue events are only gotten
when be pass the hint, so there should only need to be one hint.
Change-Id: I0838110b9b10325a9e99f8fca0b11f0a6b48f8a0
Problem: Sending samples to the cue alignmenet handler did
not reflect what was more likely to happen. In our
tests we would send all the samples for one stream
then all the samples for another stream. This created
some special cases that would either not happen in
reality or miss cases that would likely happen in
reality.
Changes: Changes all tests to dispatch samples in an interlaced
pattern that better reflects muxed content.
Change-Id: I985092154b62eb12d95499663d195ca6c103bc19
Problem: The time scale for text was being set to zero in our tests
because it was never needed.
Change: This changes it to use MS as that is what's most common and
requires the least amount of changes.
Change-Id: Ia046ac1994b4cede079d2f801275c7f058d5bdd3
Updated TextChunker to handle incoming CueEvents. Connecting the
text chunker with the cue alignment handler will happen in a later
CL.
Issue: #362
Change-Id: Ib1fa9f457cf4ec0ce413dadcfa7eed5895ecd628
Move the webvtt segmenter to the chunking directory so that it
can be converted to a general purpose text chunker.
Change-Id: I9ecd7ee39cb73070dab07b64f65ef24af1404813
SyncPointQueue manages all cue points and returns aligned cue
points to the callers (CueAlignmentHandlers).
CueAlignmentHandler is responsible for aligning cues from different
streams. It uses SyncPointQueue internally to align / synchronize the
cue points.
Issue: #355
Change-Id: I281fecb46a3ca7172d71e7495bdd07b8efdeb283
Instead of using next segment start time, as CueEvent time may not
align with segment start time exactly.
Also remove the incorrect DCHECK in ChunkingHandler when processing
kScte35Event.
Change-Id: I4987740c99c8d0d25c9b99bddc5e557e45d308e0
Seeing some failures on some platforms when compiled with clang
disabled:
GYP_DEFINES="clang=0" gclient runhooks
Several changes to make it work:
1. Mark packager code with packager_code=1 in GYP definitions.
2. Disable a few checks in non-packager code, which we do not have
direct control: dangling-else, deprecated-declarations,
unused-function
3. Fix the relevant errors in packager code.
4. Revert HAVE_STROPTS_H in curl config which is not available in
all linux distributions.
Fixes#286Fixes#293
Change-Id: I729b41f99403c5ad9487c6cc4a7dc06f6323cef8
To allow more tests to use the MediaHandlerTestBase and get access to the
helpful creation methods, this change moves the use of FakeMediaHandler
and setting up the graph to a sub class.
Change-Id: I90dd151e3c96d8fbe4bd02a1d6b11e66a279d95b
In prep for changes to Trick Play, we want to make all messages
copy on write so that if the same message is sent to multiple
handlers, it is not possible for one handler to change the data
another handler is using.
Change-Id: I554166ca11c532412e4dfced5603972ca24dc2bb
This CL also removes EncryptionConfig stream data type and merges it
into StreamInfo/SegmentInfo instead.
Change-Id: Idb70ce503e61d3c951225cc78b6b15c084e16dcd
Also moved MediaHandler output validation to Initialize instead.
This CL also addresses #122 with consistent chunking.
Change-Id: I60c0da6d1b33421d7828bcb827d18899e71884ce
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
KongQun Yang
Aaron Vaage
Kamesh Devarakonda