The helpers use local memory to compute the final hash,
making AV_HASH_MAX_SIZE safe to use.

Signed-off-by: James Almer <jamrial@gmail.com>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

Signed-off-by: James Almer <jamrial@gmail.com>

Initialize it with UINT32_MAX and xor the result with UINT32_MAX
as well.

Signed-off-by: James Almer <jamrial@gmail.com>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

Adler must be initialized with a non zero value.

Signed-off-by: James Almer <jamrial@gmail.com>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

Signed-off-by: James Almer <jamrial@gmail.com>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

Also use this API in framemd5.

Signed-off-by: Reimar Döffinger <Reimar.Doeffinger@gmx.de>