Add PIXEL_FORMAT_MT21.

Add PIXEL_FORMAT_MT21.

MT21 is a MediaTek proprietary format. MT21 is similar to NV21
except the memory layout and pixel layout (swizzles). YUV 4:2:0.
2x2 VU samples. 12 bits per pixel.

Each image contains two buffers, one for Y plane and one for
interleaved VU plane. Two planes can be non-contiguous in memory.

Suppose image dimension is (width, height)

Plane[0]: Y plane
Start address alignment = 4K bytes
Offset from Buffer[0] start address = 0
Row pitch = ((width+15)/16) * 16
Plane size = Row pitch * (((height+31)/32)*32)

Plane[1]: VU plane
Start address alignment = 4K bytes
Offset from Buffer[1] start address = 0
Row pitch = ((width+15)/16) * 16
Plane size = Row pitch * (((height+31)/32)*32)/2

BUG=chrome-os-partner:44784
TESTS=Play video and run apprtc loopback.

CQ_INCLUDE_TRYBOTS=tryserver.blink:linux_blink_rel

Committed: https://crrev.com/d9d4b9bb1bcb007db751a7473e00167ea9ffeb2f
Cr-Commit-Position: refs/heads/master@{#348575}

[wuchengli, 2015-09-09 09:13:32]

wuchengli@chromium.org changed reviewers:
+ posciak@chromium.org

[wuchengli, 2015-09-09 09:13:58]

Pawel. PTAL.

[wuchengli, 2015-09-10 14:00:44]

wuchengli@chromium.org changed reviewers:
+ asvitkine@chromium.org, dalecurtis@chromium.org, mcasas@chromium.org,
piman@chromium.org

[wuchengli, 2015-09-10 14:00:44]

piman@ Owner review for cc/
mcasas@ Owner review for content/browser/renderer_host/media
dalecurtis@ Owner review for media/
asvitkine@ Owner review for tools/metrics/

Thanks.

[Alexei Svitkine (slow), 2015-09-10 14:48:33]

histograms.xml lgtm

[DaleCurtis, 2015-09-10 15:59:49]

media/ lgtm

[piman, 2015-09-10 18:31:42]

LGTM. Could you add the description of the layout that you have in the CL
description somewhere as a comment in the code (e.g. next to the enum)? I assume
this format won't be googlable, so it'd be useful to have it somewhere.

[wuchengli, 2015-09-11 13:30:38]

On 2015/09/10 18:31:42, piman (slow to review) wrote:
> LGTM. Could you add the description of the layout that you have in the CL
> description somewhere as a comment in the code (e.g. next to the enum)? I
assume
> this format won't be googlable, so it'd be useful to have it somewhere.
Done.

[wuchengli, 2015-09-11 13:30:56]

mcasas@ owner review for
content/browser/renderer_host/media/video_capture_device_client_unittest.cc.
Thanks.

[mcasas, 2015-09-12 00:42:08]

lgtm

[wuchengli, 2015-09-12 02:47:57]

The CQ bit was checked by wuchengli@chromium.org

[wuchengli, 2015-09-12 02:47:57]

The patchset sent to the CQ was uploaded after l-g-t-m from
asvitkine@chromium.org, dalecurtis@chromium.org, piman@chromium.org
Link to the patchset: https://codereview.chromium.org/1326153002/#ps60001
(title: "address piman's comment")

[commit-bot: I haz the power, 2015-09-12 02:48:23]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1326153002/60001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1326153002/60001

[commit-bot: I haz the power, 2015-09-12 02:50:37]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2015-09-12 02:50:38]

Try jobs failed on following builders:
  ios_dbg_simulator_ninja on tryserver.chromium.mac (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.mac/builders/ios_dbg_simulator...)
  ios_rel_device_ninja on tryserver.chromium.mac (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.mac/builders/ios_rel_device_ni...)
  mac_chromium_compile_dbg_ng on tryserver.chromium.mac (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.mac/builders/mac_chromium_comp...)
  mac_chromium_rel_ng on tryserver.chromium.mac (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.mac/builders/mac_chromium_rel_...)

[wuchengli, 2015-09-12 03:46:32]

The CQ bit was checked by wuchengli@chromium.org

[wuchengli, 2015-09-12 03:46:33]

The patchset sent to the CQ was uploaded after l-g-t-m from mcasas@chromium.org,
asvitkine@chromium.org, dalecurtis@chromium.org, piman@chromium.org
Link to the patchset: https://codereview.chromium.org/1326153002/#ps80001
(title: "rebase")

[commit-bot: I haz the power, 2015-09-12 03:47:00]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1326153002/80001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1326153002/80001

[commit-bot: I haz the power, 2015-09-12 09:49:28]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2015-09-12 09:49:28]

Try jobs failed on following builders:
  linux_chromium_clobber_rel_ng on tryserver.chromium.linux (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.linux/builders/linux_chromium_...)

[wuchengli, 2015-09-14 03:53:00]

The CQ bit was checked by wuchengli@chromium.org

[commit-bot: I haz the power, 2015-09-14 03:53:40]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1326153002/80001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1326153002/80001

[commit-bot: I haz the power, 2015-09-14 06:31:49]

Committed patchset #5 (id:80001)

[commit-bot: I haz the power, 2015-09-14 06:32:26]

Patchset 5 (id:??) landed as
https://crrev.com/d9d4b9bb1bcb007db751a7473e00167ea9ffeb2f
Cr-Commit-Position: refs/heads/master@{#348575}

[commit-bot: I haz the power, 2015-09-23 12:30:23]

Patchset 5 (id:??) landed as
https://crrev.com/d9d4b9bb1bcb007db751a7473e00167ea9ffeb2f
Cr-Commit-Position: refs/heads/master@{#348575}