Calculate the Adler32 checksum of a buffer.

Passing the return value to a subsequent av_adler32_update() call allows the checksum of multiple buffers to be calculated as though they were concatenated.

Parameters

adler initial checksum value

buf pointer to input buffer

len size of input buffer

Returns

updated checksum

Definition at line 35 of file adler32.c.

Referenced by crc_write_packet(), filter_frame(), and framecrc_write_packet().

Get a seed to use in conjunction with random functions.

This function tries to provide a good seed at a best effort bases. Its possible to call this function multiple times if more bits are needed. It can be quite slow, which is why it should only be used as seed for a faster PRNG. The quality of the seed depends on the platform.

Definition at line 105 of file random_seed.c.

Referenced by av_parse_color(), config_input(), do_adobe_auth(), do_llnw_auth(), init(), main(), make_digest_auth(), mkv_write_attachments(), mkv_write_header(), mxf_gen_umid(), ogg_write_header(), rtmp_server_handshake(), rtp_write_header(), rtsp_read_setup(), and sap_write_header().