mathematics.h File Reference

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Enumerations
enum	AVRounding {   AV_ROUND_ZERO = 0, AV_ROUND_INF = 1, AV_ROUND_DOWN = 2, AV_ROUND_UP = 3,   AV_ROUND_NEAR_INF = 5 }
Functions
int64_t	av_rescale (int64_t a, int64_t b, int64_t c)
	rescale a 64bit integer with rounding to nearest.
int64_t	av_rescale_rnd (int64_t a, int64_t b, int64_t c, enum AVRounding)
	rescale a 64bit integer with specified rounding.
int64_t	av_rescale_q (int64_t a, AVRational bq, AVRational cq)
	rescale a 64bit integer by 2 rational numbers.

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Enumeration Type Documentation

enum AVRounding

Enumerator:

AV_ROUND_ZERO	round toward zero
AV_ROUND_INF	round away from zero
AV_ROUND_DOWN	round toward -infinity
AV_ROUND_UP	round toward +infinity
AV_ROUND_NEAR_INF	round to nearest and halfway cases away from zero

Definition at line 26 of file mathematics.h.

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Function Documentation

int64_t av_rescale	(	int64_t	a,
		int64_t	b,
		int64_t	c
	)

rescale a 64bit integer with rounding to nearest.

a simple a*b/c isn't possible as it can overflow

Definition at line 104 of file mathematics.c.

Referenced by asf_build_simple_index(), av_estimate_timings_from_bit_rate(), av_gen_search(), av_seek_frame(), av_update_cur_dts(), avi_read_header(), avi_read_packet(), avi_read_seek(), compute_pkt_fields(), compute_pkt_fields2(), dc1394_read_header(), AvFormatDecoder::DoFastForward(), dump_format(), dv_extract_video_info(), dv_offset_reset(), dv_read_header(), getFileInfo(), main(), mov_read_packet(), mpeg_mux_write_packet(), mxf_read_seek(), nsv_parse_NSVs_header(), output_packet(), pcm_read_seek(), and wav_write_trailer().

int64_t av_rescale_rnd	(	int64_t	a,
		int64_t	b,
		int64_t	c,
		enum	AVRounding
	)

rescale a 64bit integer with specified rounding.

a simple a*b/c isn't possible as it can overflow

Definition at line 52 of file mathematics.c.

Referenced by av_rescale(), av_rescale_q(), av_rescale_rnd(), ff_nut_reset_ts(), gxf_write_media_preamble(), mov_write_edts_tag(), mov_write_mvhd_tag(), mov_write_tkhd_tag(), pcm_read_seek(), and rtp_write_header().

int64_t av_rescale_q	(	int64_t	a,
		AVRational	bq,
		AVRational	cq
	)

rescale a 64bit integer by 2 rational numbers.

Definition at line 108 of file mathematics.c.

Referenced by av_find_stream_info(), av_update_stream_timings(), fill_all_stream_timings(), mov_read_seek(), mp3_parse_vbr_tags(), oggvorbis_encode_frame(), rtcp_send_sr(), rtp_write_header(), and rtsp_read_seek().