8673 Commits

Author SHA1 Message Date
honghaiz
524ecc29dd Ping connections with the fast rate until each connection is pinged at least three times,
or the connection times out or is pruned.

BUG=webrtc:5927

Review-Url: https://codereview.webrtc.org/2009763002
Cr-Commit-Position: refs/heads/master@{#12899}
2016-05-25 19:48:36 +00:00
kjellander
080a1e3fa6 Fix iOS GN build and cleanup system_wrappers
Compile fixes for GN on iOS that finally gets our bots green.

Changes to system_wrappers:
* Updated to only use inclusive sources for maintainability
* Add a few missing GN headers.
* Cleanup GYP hack for atomic32_mac.cc
* Renamed changes sources to avoid problems with GYP/GN file
   suffix rules:
  - atomic32_mac.cc -> atomic32_darwin.cc
  - atomic32_posix.cc -> atomic32_non_darwin_unix.cc
See https://code.google.com/p/chromium/codesearch#chromium/src/build/config/BUILDCONFIG.gn&l=325
for details on which extensions can/cannot be used.

BUG=webrtc:5586
NOTRY=True

Review-Url: https://codereview.webrtc.org/1999723002
Cr-Commit-Position: refs/heads/master@{#12897}
2016-05-25 18:37:17 +00:00
Peter Boström
a4463bcd07 Report framedrops outside libvpx to QualityScaler.
BUG=webrtc:5678
R=danilchap@webrtc.org

Review URL: https://codereview.webrtc.org/2009873002 .

Cr-Commit-Position: refs/heads/master@{#12896}
2016-05-25 16:08:55 +00:00
nisse
47ac4620c8 Delete AndroidVideoCapturer::FrameFactory.
Splits VideoCapturer::OnFrameCaptured into helper methods,
which enables use of the VideoAdaptation logic without
using a frame factory.

Refactors AndroidVideoCapturer to make adaptation decision
earlier, so we can crop and rotate using
NV12ToI420Rotate.

BUG=webrtc:5682

Review-Url: https://codereview.webrtc.org/1973873003
Cr-Commit-Position: refs/heads/master@{#12895}
2016-05-25 15:47:05 +00:00
henrik.lundin
612c25e7af NetEq: Fix stats counting in muted mode
The NetEqNetworkStatistics::expand_rate was not incremented during muted
state, which caused under-reporting of that metric. This change fixes
that.

BUG=chromium:613321, webrtc:5608

Review-Url: https://codereview.webrtc.org/2003203004
Cr-Commit-Position: refs/heads/master@{#12894}
2016-05-25 15:21:09 +00:00
ossu
e352578bc8 Moved injection of AudioDecoderFactory into voe::Channel.
Channel's API remains unchanged, but the creation of a BuiltinAudioDecoderFactory is now in Channel. The next step would be to amend Channel's API (through CreateChannel, I believe) to allow an AudioDecoderFactory to be sent along.

BUG=webrtc:5805

Review-Url: https://codereview.webrtc.org/1992763002
Cr-Commit-Position: refs/heads/master@{#12893}
2016-05-25 14:37:47 +00:00
noahric
57779104f0 Forward Encode failure codes from sub encoders.
Previously, failure codes were ignored, which meant simulcasted codecs
couldn't e.g. trigger software fallback. This stops the simulcasted
Encode call at the first faiulre and returns that code.

Another option is to continue sending the frame to the other encoders
but still return the first failure code. It's not clear that that is any
better than just quitting as soon as a failure happens.

BUG=

Review-Url: https://codereview.webrtc.org/2008723002
Cr-Commit-Position: refs/heads/master@{#12892}
2016-05-25 13:48:54 +00:00
nisse
e5e5292adb Let VideoRenderFrames::FrameToRender return a rtc::Optional.
This eliminates one use of IsZeroSize.

BUG=webrtc:5682

Review-Url: https://codereview.webrtc.org/2008513003
Cr-Commit-Position: refs/heads/master@{#12891}
2016-05-25 13:25:26 +00:00
henrika
1f0ad1085d Adds support for detection of pro-audio support on Android.
A new API is added which enables detection of support of pro-audio on
Android. This is part of a larger change and the new API is not used yet.
Most likely it will only be used for logging purposes.

BUG=webrtc:5925

Review-Url: https://codereview.webrtc.org/2015483002
Cr-Commit-Position: refs/heads/master@{#12890}
2016-05-25 12:15:19 +00:00
Henrik Boström
300450b4b8 Increase the rtccertificategenerator_unittest.cc certificate generation timeout
to hopefully avoid a timeout flake on the bots.

R=hta@webrtc.org

Review URL: https://codereview.webrtc.org/2012563003 .

Cr-Commit-Position: refs/heads/master@{#12889}
2016-05-25 12:06:43 +00:00
sakal
b0cf1a8916 Improve IP_PATTERN in DirectRTCClient in Android AppRTC Demo
Earlier, strings like "aaaa" and "1111" would be interpreted as IP
addresses, which is not optimal. This CL improves the IP_PATTERN and
adds a test for it.

Review-Url: https://codereview.webrtc.org/2009493002
Cr-Commit-Position: refs/heads/master@{#12887}
2016-05-25 09:26:29 +00:00
philipel
834081aadf Disabled BasicPortAllocatorTest.TestDisableUdpTurn (flaky)
TBR=mflodman@webrtc.org

BUG=webrtc:5929

Review URL: https://codereview.webrtc.org/2011593003 .

Cr-Commit-Position: refs/heads/master@{#12886}
2016-05-25 09:13:03 +00:00
sakal
c00687ff5d Add an option to disable built-in AEC to AppRTC Android Demo
BUG=webrtc:5923

Review-Url: https://codereview.webrtc.org/2002093002
Cr-Commit-Position: refs/heads/master@{#12885}
2016-05-25 07:09:50 +00:00
henrik.lundin
46ba49c622 Let PacketSource::NextPacket() return an std::unique_ptr
The return type of PacketSource::NextPacket() is changed from a naked
pointer to an std::uniqe_ptr. The interface contract was and still is
that the ownership is passed from the callee to the caller, but a
unique_ptr makes this explicit.

BUG=webrtc:2692

Review-Url: https://codereview.webrtc.org/2005873002
Cr-Commit-Position: refs/heads/master@{#12884}
2016-05-25 05:50:54 +00:00
peah
60a189f1bf This CL updates and extends the audioproc_f command line
tool to support all the functionality needed for simulating
and analyzing the audio processing module behavior during
calls.

BUG=

Review-Url: https://codereview.webrtc.org/1907223003
Cr-Commit-Position: refs/heads/master@{#12882}
2016-05-25 03:54:46 +00:00
danilchap
13deaad1bd TMMBRHelp moved from member object/base class to stack object,
indicating the usage of this helper is local.
With local usage critical section become obvisously useless and removed.

BUG=webrtc:5565
R=åsapersson

Review-Url: https://codereview.webrtc.org/1959013003
Cr-Commit-Position: refs/heads/master@{#12881}
2016-05-24 20:25:35 +00:00
Honghai Zhang
1590c3937c Fire a signal when the transport channel state changes
This fixes an issue that sometimes the transport channel state changes but
the transportcontroller is not notified.

BUG=5907
R=deadbeef@webrtc.org, pthatcher@webrtc.org

Review URL: https://codereview.webrtc.org/1996693002 .

Cr-Commit-Position: refs/heads/master@{#12880}
2016-05-24 20:15:14 +00:00
Henrik Boström
6c96314b42 RTCCertificateGeneratorInterface and RTCCertificateGeneratorStoreWrapper added.
This CL adds these classes but does not change any functonality or interface
yet. This is in preparation for future CLs. To be used for this:
https://codereview.webrtc.org/2000163002/

RTCCertificateGenerator is meant to replace DtlsIdentityStoreInterface and
implementations. In order to continue to support mocking and to help with the
transition, RTCCertificateGenerator gets an interface that it implements (just
like the store has both interface and impl).

PeerConnectionFactoryInterface::CreatePeerConnection will take an
RTCCertificateGeneratorInterface instead of DtlsIdentityStoreInterface. As to
not break Chromium, both versions of CreatePeerConnection need to exist for a
transition period. This will be done by wrapping a store into a generator
wrapper - RTCCertificateGeneratorStoreWrapper.

BUG=webrtc:5707, webrtc:5708
R=hta@webrtc.org, tommi@chromium.org, tommi@webrtc.org

Review URL: https://codereview.webrtc.org/2001103002 .

Cr-Commit-Position: refs/heads/master@{#12879}
2016-05-24 18:46:42 +00:00
tommi
09c60da704 Split TaskQueue out into a separate build target.
This is needed as there are targets such as newlib_pnacl/remoting_client_plugin_newlib.pexe that depend on rtc_base_approved but don't need TaskQueue. We could implement support for TaskQueue in nacl using ppapi types, but it looks like there isn't a need for it. Libevent isn't supported for nacl either, so I'm introducing a layer on top of rtc_base_approved for TaskQueue.  It's conceivable that this target will morph into a target that holds other threading primitives such as platform_thread and possibly socket related operations, which is also an area that we currently #ifdef out for nacl in a few places.

Functional change: Removes the "is_nacl" check.

R=phoglund@webrtc.org

Review-Url: https://codereview.webrtc.org/2001913002
Cr-Commit-Position: refs/heads/master@{#12878}
2016-05-24 18:40:44 +00:00
tommi
1b32acdbd0 Remove unused libjingle_xmpphelp target.
NOTRY=true

Review-Url: https://codereview.webrtc.org/2011503002
Cr-Commit-Position: refs/heads/master@{#12877}
2016-05-24 18:33:39 +00:00
zhihuang
6d0d4bf31d Change the size of the ICE ufrag to 4 bytes.
This is the minumum allowed size, and will allow STUN pings to be smaller.
The unit tests on the the Gturn are also modified. A username with length of 16 bytes will be generated for Gturn only.

Review-Url: https://codereview.webrtc.org/1848083002
Cr-Commit-Position: refs/heads/master@{#12876}
2016-05-24 17:13:41 +00:00
nisse
6670483db8 Delete unused include of videorendererfactory.h.
BUG=webrtc:5924

Review-Url: https://codereview.webrtc.org/2003293002
Cr-Commit-Position: refs/heads/master@{#12875}
2016-05-24 14:13:11 +00:00
tommi
fb98b9edb4 Revert of Adding a some checks and switching out a few assert for RTC_[D]CHECK. (patchset #6 id:100001 of https://codereview.webrtc.org/2007563002/ )
Reason for revert:
Reverting temporarily.  Need to fix tests downstream that pass invalid arguments.

Original issue's description:
> Adding a some checks and switching out a few assert for RTC_[D]CHECK.
> These changes are around use of AudioFrame.data_ to help us catch issues earlier since assert() is left out in release builds, including builds with DCHECK enabled.  I've also added a few full-on CHECKs to avoid reading past buffer boundaries or continuing on in a failed state.
>
> BUG=chromium:613482
> NOTRY=true
> (using notry due to offline android_arm64_rel bot)
>
> Committed: https://crrev.com/d36df89d40bde3c62ee5cbff841933e50b3c007b
> Cr-Commit-Position: refs/heads/master@{#12870}

TBR=henrik.lundin@webrtc.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=chromium:613482

Review-Url: https://codereview.webrtc.org/2006243002
Cr-Commit-Position: refs/heads/master@{#12874}
2016-05-24 13:44:36 +00:00
henrik.lundin
ce5570e54e Move neteq_rtpplay.cc inside webrtc::test namespace
This simplifies the code.

BUG=webrtc:2692

Review-Url: https://codereview.webrtc.org/2006723002
Cr-Commit-Position: refs/heads/master@{#12873}
2016-05-24 13:15:03 +00:00
asapersson
7d56997894 Adjust max number of samples that can be stored for a histogram (2000->300).
Consider follow up and use actual bucket count when storing samples.

BUG=

Review-Url: https://codereview.webrtc.org/2008483002
Cr-Commit-Position: refs/heads/master@{#12872}
2016-05-24 13:03:45 +00:00
minyue
58530ed246 Updating APM unittests on the echo metrics.
There were a series of changes in the calculation of echo metrics. There changes made the existing unittests lose, e.g., EXPECT_EQ become EXPECT_NEAR. It is good time to protect the echo calculation more strictly.

The change is not simply generating a new reference file and change EXPECT_NEAR to EXPECT_EQ. It strengthens the test as well. Main changes are

1. the old test only sample a metric at the end of processing, while the new test takes metrics during the call with a certain time interval. This gives a much stronger protection.

2. added protection of a newly added metric, called divergent_filter_fraction.

3. as said, use EXPECT_EQ (actually ASSERT_EQ) instead of EXPECT_NEAR as much as possible, even for float point values. This may be too restrictive. But it can be good to be restrictive at the beginning.

BUG=

Review-Url: https://codereview.webrtc.org/1969403003
Cr-Commit-Position: refs/heads/master@{#12871}
2016-05-24 12:50:29 +00:00
tommi
d36df89d40 Adding a some checks and switching out a few assert for RTC_[D]CHECK.
These changes are around use of AudioFrame.data_ to help us catch issues earlier since assert() is left out in release builds, including builds with DCHECK enabled.  I've also added a few full-on CHECKs to avoid reading past buffer boundaries or continuing on in a failed state.

BUG=chromium:613482
NOTRY=true
(using notry due to offline android_arm64_rel bot)

Review-Url: https://codereview.webrtc.org/2007563002
Cr-Commit-Position: refs/heads/master@{#12870}
2016-05-24 12:49:10 +00:00
tommi
32e80e4b2e Separate out xml dependencies and tests from rtc_unittests into a separate target.
NOTRY=true
(using notry due to offline android_arm64_rel bot)

Review-Url: https://codereview.webrtc.org/2007773003
Cr-Commit-Position: refs/heads/master@{#12869}
2016-05-24 12:48:02 +00:00
tommi
48831cd8a4 Remove xmllite and xmpp dependencies from merge_libs.gyp.
I looked around and couldn't find any use of these dependencies.

NOTRY=true
(setting NOTRY since merge_libs.gyp isn't actually referenced by any gyp file, it's only used downstream)

Review-Url: https://codereview.webrtc.org/2007883002
Cr-Commit-Position: refs/heads/master@{#12868}
2016-05-24 12:46:25 +00:00
Peter Boström
e23e760643 Integrate QualityScaler into VideoToolboxEncoder.
Improves visual quality and framerate during low bitrates by
dropping resolution.

BUG=webrtc:5678
R=tkchin@webrtc.org

Review URL: https://codereview.webrtc.org/2001153003 .

Cr-Commit-Position: refs/heads/master@{#12867}
2016-05-24 10:24:14 +00:00
Peter Boström
cc1543abf3 Move H264BitstreamParser to video_coding.
Moves parser, used in video_coding/ from rtp_rtcp where it is unused.

BUG=webrtc:5678
R=asapersson@webrtc.org
TBR=glaznev@webrt.org

Review URL: https://codereview.webrtc.org/2007553003 .

Cr-Commit-Position: refs/heads/master@{#12866}
2016-05-24 10:16:39 +00:00
tommi
3ede7be00a Remove xmllite and xmpp dependencies from media.gyp
BUG=

Review-Url: https://codereview.webrtc.org/2008593003
Cr-Commit-Position: refs/heads/master@{#12865}
2016-05-24 09:33:55 +00:00
philipel
49c0869825 Revert of Change initial DTLS retransmission timer from 1 second to 50ms. (patchset #2 id:20001 of https://codereview.webrtc.org/1981463002/ )
Reason for revert:
Seems like this CL cause
DtlsTransportChannelTest.TestReceiveClientHelloBeforeRemoteFingerprint
DtlsTransportChannelTest.TestReceiveClientHelloBeforeWritable
to consistently fail on Win DrMemory Full and for
DtlsTransportChannelTest.TestReceiveClientHelloBeforeRemoteFingerprint
DtlsTransportChannelTest.TestReceiveClientHelloBeforeWritable
to consistently fail on Linux Memcheck

Original issue's description:
> Change initial DTLS retransmission timer from 1 second to 50ms.
>
> This will help ensure a timely DTLS handshake when there's packet
> loss. It will likely result in spurious retransmissions (since the
> RTT is usually > 50ms), but since exponential backoff is still used,
> there will at most be ~4 extra retransmissions. For a time-sensitive
> application like WebRTC this seems like a reasonable tradeoff.
>
> R=juberti@chromium.org, juberti@webrtc.org, pthatcher@webrtc.org
>
> Committed: https://crrev.com/1e435628366fb9fed71632369f05928ed857d8ef
> Cr-Commit-Position: refs/heads/master@{#12853}

TBR=pthatcher@webrtc.org,juberti@webrtc.org,juberti@chromium.org,deadbeef@webrtc.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true

Review-Url: https://codereview.webrtc.org/2002403002
Cr-Commit-Position: refs/heads/master@{#12864}
2016-05-24 08:49:46 +00:00
philipel
5ceaaae368 PacketBuffer now can save how many times a packet has been nacked.
Also save size/max nack count in the FrameObject/RtpFrameObject.

BUG=webrtc:5514
R=stefan@webrtc.org

Review URL: https://codereview.webrtc.org/1988653002 .

Cr-Commit-Position: refs/heads/master@{#12863}
2016-05-24 08:21:00 +00:00
terelius
f1a9a545ff Improved error checking for file errors in RtcEventLog.
Review-Url: https://codereview.webrtc.org/1997393002
Cr-Commit-Position: refs/heads/master@{#12862}
2016-05-24 08:04:02 +00:00
sakal
05cdb85012 UI for AppRTC Android demo that doesn't require Design Support Library
For simplicity, this CL removes the need for Design Support Library.
UI is slightly changed for this to be possible. Floating Action Button
for adding favorite is removed and instead there's a button next to the
TextView.

Review-Url: https://codereview.webrtc.org/2003983002
Cr-Commit-Position: refs/heads/master@{#12861}
2016-05-24 07:18:18 +00:00
sakal
47456803d9 Make Android MediaEncoder loop not run when there aren't any frames left.
This CL makes the loop stop when all frames have been delivered and
start again when a new frame is inserted.

BUG=webrtc:5680

Review-Url: https://codereview.webrtc.org/2000103002
Cr-Commit-Position: refs/heads/master@{#12860}
2016-05-24 07:17:06 +00:00
nisse
94cd3fa03a Eliminate use of IsZeroSize method
Check for dropped frames by instead checking the
frame_buffer pointer directly.

Also add RTC_DCHECK to verify that a webrtc::VideoFrame never
has video_frame_buffer_ set to nullptr (except by the default
constructor).

BUG=webrtc:5682

Review-Url: https://codereview.webrtc.org/1995343002
Cr-Commit-Position: refs/heads/master@{#12859}
2016-05-24 06:36:00 +00:00
kjellander
7e9274638e iOS: Replace find with actual filenames listed.
Some build tools downstream breaks since find on Linux
doesn't support the -E flag.
Shell commands also shouldn't be executed as part of GYP unless there's
no other way around the problem.

NOTRY=True

Review-Url: https://codereview.webrtc.org/2008693002
Cr-Commit-Position: refs/heads/master@{#12858}
2016-05-24 05:13:51 +00:00
Taylor Brandstetter
417eebe5dd Fixing the behavior of the candidate filter with pooled candidates.
According to JSEP, the candidate filter does not affect pooled
candidates because they can be filtered once they're ready to be
surfaced to the application.

So, pooled port allocator sessions will use a filter of CF_ALL, with a
new filter applied when the session is taken by a P2PTransportChannel.

When the filter is applied:
* Some candidates may no longer be returned by ReadyCandidates()
* Some candidates may no longer have a "related address" (for privacy)
* Some ports may no longer be returned by ReadyPorts()

To simplify this, the candidate filtering logic is now moved up from
the Ports to the BasicPortAllocator, with some helper methods to perform
the filtering and stripping out of data.

R=honghaiz@webrtc.org, pthatcher@webrtc.org

Review URL: https://codereview.webrtc.org/1998813002 .

Cr-Commit-Position: refs/heads/master@{#12856}
2016-05-23 23:02:29 +00:00
Stefan Holmer
5b53b0eeb4 Remove timing dependent packet checks from socket tests.
This avoids flaky tests and the check itself doesn't provide much value anyway.

TBR=pthatcher@webrtc.org

Review URL: https://codereview.webrtc.org/2005993002 .

Cr-Commit-Position: refs/heads/master@{#12855}
2016-05-23 20:56:22 +00:00
Taylor Brandstetter
8fcf414846 Attempting to fix flaky tests that deal with STUN timeout.
The STUN timeout is 9500ms, and the tests are waiting for 10000ms.

The 500ms margin of error is not enough for some bots (such as UBSan).

R=pthatcher@webrtc.org

Review URL: https://codereview.webrtc.org/2001093003 .

Cr-Commit-Position: refs/heads/master@{#12854}
2016-05-23 19:49:35 +00:00
Taylor Brandstetter
1e43562836 Change initial DTLS retransmission timer from 1 second to 50ms.
This will help ensure a timely DTLS handshake when there's packet
loss. It will likely result in spurious retransmissions (since the
RTT is usually > 50ms), but since exponential backoff is still used,
there will at most be ~4 extra retransmissions. For a time-sensitive
application like WebRTC this seems like a reasonable tradeoff.

R=juberti@chromium.org, juberti@webrtc.org, pthatcher@webrtc.org

Review URL: https://codereview.webrtc.org/1981463002 .

Cr-Commit-Position: refs/heads/master@{#12853}
2016-05-23 19:49:00 +00:00
Honghai Zhang
da2ba4dcba Pass around the candidate removals events in IOS clients
When local candidates are removed, signal to RTCPeerConnection
and eventually send to the remote client.
When a candidate-removal message is received, notify the native PeerConnection.

BUG=
R=tkchin@webrtc.org

Review URL: https://codereview.webrtc.org/1972483002 .

Cr-Commit-Position: refs/heads/master@{#12852}
2016-05-23 18:53:26 +00:00
Stefan Holmer
3ebb3efd13 Don't read socket timestamps when building native client.
BUG=webrtc:5773
R=pthatcher@webrtc.org

Review URL: https://codereview.webrtc.org/2008573002 .

Cr-Commit-Position: refs/heads/master@{#12851}
2016-05-23 18:26:25 +00:00
Stefan Holmer
9131efdb30 Read recv timestamps from socket (posix only).
This helps a lot on Android devices where the user threads can be scheduled with low priority when the app is in the background, causing spurious significantly delayed before a packet can be read from the socket. With this patch the timestamp is taken by the kernel when the packet actually arrives.

R=juberti@chromium.org
TBR=juberti@webrtc.org

BUG=webrtc:5773

Review URL: https://codereview.webrtc.org/1944683002 .

Cr-Commit-Position: refs/heads/master@{#12850}
2016-05-23 16:19:37 +00:00
Magnus Jedvert
181310fb6f Android: Drop old frame in SurfaceTextureHelper.startListening()
Drop any pending texture frame when SurfaceTextureHelper.startListening()
is called because the frame might be from the previous
startListening()/stopListening() capture session. This typically happens
when switching between the front/back camera, and an old frame will get
incorrect rotation and mirroring because of the front/back camera
mismatch.

Dropping the frame in SurfaceTextureHelper also removes the need for
the |dropNextFrame| logic in VideoCapturerAndroid.

R=perkj@webrtc.org

Review URL: https://codereview.webrtc.org/2002963002 .

Cr-Commit-Position: refs/heads/master@{#12849}
2016-05-23 14:26:59 +00:00
asapersson
b432b26b5f Android: Add API for getting native histograms.
The function getAndReset returns a map which holds the name of a histogram and its samples.

This CL depends on: https://codereview.webrtc.org/1915523002/

BUG=

Review-Url: https://codereview.webrtc.org/1952223007
Cr-Commit-Position: refs/heads/master@{#12848}
2016-05-23 13:49:41 +00:00
asapersson
0e9d6d9e0c Add class which periodically computes statistics.
During a period (e.g. 2 seconds), different metrics can be computed, e.g.:
- average of samples
- percentage/permille of samples
- units per second

Each periodic metric can be either:
- reported to an observer each period
- aggregated during the call (e.g. min, max, average)

BUG=webrtc:5283

Review-Url: https://codereview.webrtc.org/1640053003
Cr-Commit-Position: refs/heads/master@{#12847}
2016-05-23 13:08:05 +00:00
kwiberg
bca568bfc5 Fix an UBSan error (signed overflow) in saturating addition and subtraction
Of course, functions called WebRtcSpl_AddSatW32 and WebRtcSpl_SubSatW32 are supposed to handle overflow gracefully, and they probably did. But since the overflow handling depended on undefined behavior, a sufficiently smart optimizing compiler would have realized that it could just ignore the possibility of overflow and omit all the overflow handling code, leaving only the unadorned addition or subtraction.

Also, the new implementations, unlike the old ones, result in branch-free code (tested with clang 3.9 with -O2).

BUG=chromium:601728

Review-Url: https://codereview.webrtc.org/2002523002
Cr-Commit-Position: refs/heads/master@{#12846}
2016-05-23 11:07:10 +00:00