Support CRYPTO_MODE_AES_CBC #1989
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ojw28
changed the title
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We don't support CRYPTO_MODE_AES_CBC yet. Note that it's only available from API level 24, so it's not hugely useful right now given the low penetration of the Android N release. We do have support going forward, so marking as an enhancement. |
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@ojw28 is CBC mode guaranteed in API 24 or is it an OEM 'optional' mode? Also - what encryption pattern is suuported - cbcs or cbc1? |
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Unsure. @wvpaf, do you know? |
This will allow supporting more encryption schemes. Including some that require more encryption data, like the encryption pattern. Issue:#1661 Issue:#1989 Issue:#2089 ------------- Created by MOE: https://github.com/google/moe MOE_MIGRATED_REVID=155481889
At the moment, only CENC-defined scheme types are known values. This will allow having more information about the encryption scheme through the format, which in turn will allow more informed decisions on format support. Issue:#1661 Issue:#1989 Issue:#2089 ------------- Created by MOE: https://github.com/google/moe MOE_MIGRATED_REVID=159538907
Issue:#1661 Issue:#1989 Issue:#2089 ------------- Created by MOE: https://github.com/google/moe MOE_MIGRATED_REVID=159553419
This will extend our CENC modes support to cbcs and cens. The change was not split into two different CLs due to lack of test content for default initialization vectors, aside from AES-CBCS encrypted ones. Issue:#1661 Issue:#1989 Issue:#2089 ------------- Created by MOE: https://github.com/google/moe MOE_MIGRATED_REVID=159810371
This CL also makes DefaultTrackSelector take it into account when RendererCapabilities sets it to unsupported. A following CL could add a DefaultTrackSelector parameter to force DRM "known support" for specific track types. Issue:#1661 Issue:#1989 Issue:#2089 ------------- Created by MOE: https://github.com/google/moe MOE_MIGRATED_REVID=161556467
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We've added the necessary support in ExoPlayer. Note that the platform only provides the underlying support from API level 24+. We've also found quite a few API level 24+ devices that appear to not work correctly with the new crypto modes. We're following up with the device manufacturers, and also trying to get some better platform level testing in place. |
CRYPTO_MODE_AES_CBC = MediaCodec.CRYPTO_MODE_AES_CBC;
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