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In the new AUTO mode, restrict the minimum alt-ref interval and max column
tiles adaptively based on picture size, while not applying any rate control
constraints.
This mode aims to produce encodings that fit into levels corresponding to
the source picture size, with minimum compression quality lost. However, the
bitstream is not guaranteed to be level compatible, e.g., the average bitrate
may exceed level limit.
BUG=b/64451920
Change-Id: I02080b169cbbef4ab2e08c0df4697ce894aad83c
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Obtaining a level that is lower than the target should be tolerated.
Change-Id: I90a55ee6d7142e9f6cc525ebbd1e0501defcbe28
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Also reduce the number of test frames.
Change-Id: Iea6fa93ca6b924535aef7bf8b388db4d0ec84c08
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Constraints on encoder config:
-target_bandwidth is no larger than 80% of level bitrate limit
-target_bandwidth * (1 + max_over_shoot_pct) is no larger than
88% of level bitrate limit
-min_gf_interval is no smaller than level limit
-tile_columns is no larger than level limit
Constraints on rate control:
-current frame size plus previous three frames' size is no larger
than the CPB level limit
-current frame size is no larger than 50%/40%/20% of the CPB
level limit if it's a key/alt-ref/other frame.
Change-Id: I84d1a2d6d6e3c82bfd533b3309ce999cfaba2c8b
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Change-Id: I0d9ab85855eb723f653a7bb09b3d0d31dd6cfd2f
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Change-Id: I1ef3df0192491035728fe9d5eb25cc66dc2965de
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Change-Id: I99f50bdd5af3f64a029c2f5f6f5fb1ff45bad67e
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