#include <assert.h>
#include "avutil.h"
#include "common.h"
#include "mathematics.h"
Go to the source code of this file.
Functions | |
| int64_t | av_gcd (int64_t a, int64_t b) |
| int64_t | ff_gcd (int64_t a, int64_t b) |
| int64_t | av_rescale_rnd (int64_t a, int64_t b, int64_t c, enum AVRounding rnd) |
| Rescales a 64-bit integer with specified rounding. | |
| int64_t | av_rescale (int64_t a, int64_t b, int64_t c) |
| Rescales a 64-bit integer with rounding to nearest. | |
| int64_t | av_rescale_q (int64_t a, AVRational bq, AVRational cq) |
| Rescales a 64-bit integer by 2 rational numbers. | |
Variables | |
| const uint8_t | ff_sqrt_tab [256] |
| const uint8_t | ff_log2_tab [256] |
Definition in file mathematics.c.
| int64_t av_gcd | ( | int64_t | a, | |
| int64_t | b | |||
| ) |
Definition at line 53 of file mathematics.c.
Referenced by av_find_stream_info(), av_gcd(), av_reduce(), av_set_pts_info(), avcodec_string(), decode_main_header(), dump_stream_format(), ff_gcd(), ff_parse_specific_params(), h263_decode_picture_header(), mov_read_ctts(), mov_read_elst(), mov_read_stts(), MPV_encode_init(), and xvid_correct_framerate().
| int64_t av_rescale | ( | int64_t | a, | |
| int64_t | b, | |||
| int64_t | c | |||
| ) | const |
Rescales a 64-bit integer with rounding to nearest.
A simple a*b/c isn't possible as it can overflow.
Definition at line 116 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_common(), dump_format(), finalize_packet(), mov_read_packet(), mov_read_trak(), mpeg_mux_write_packet(), mpegts_write_packet(), mxf_read_seek(), nsv_parse_NSVs_header(), output_packet(), and r3d_read_reda().
| int64_t av_rescale_q | ( | int64_t | a, | |
| AVRational | bq, | |||
| AVRational | cq | |||
| ) |
Rescales a 64-bit integer by 2 rational numbers.
Definition at line 120 of file mathematics.c.
Referenced by av_encode(), av_find_stream_info(), av_update_stream_timings(), compute_chapters_end(), decode_thread(), do_audio_out(), do_subtitle_out(), do_video_out(), dv_extract_video_info(), dv_offset_reset(), dv_read_header(), ff_interleave_new_audio_packet(), fill_all_stream_timings(), http_prepare_data(), main(), mov_read_seek(), mp3_parse_vbr_tags(), ogg_compare_granule(), oggvorbis_encode_frame(), output_packet(), rl2_read_seek(), rtcp_send_sr(), rtp_write_header(), rtsp_read_seek(), write_audio_frame(), and write_video_frame().
| int64_t av_rescale_rnd | ( | int64_t | a, | |
| int64_t | b, | |||
| int64_t | c, | |||
| enum | AVRounding | |||
| ) | const |
Rescales a 64-bit integer with specified rounding.
A simple a*b/c isn't possible as it can overflow.
Definition at line 64 of file mathematics.c.
Referenced by av_nearer_q(), av_rescale(), av_rescale_q(), av_rescale_rnd(), dv_write_pack(), ff_nut_reset_ts(), gxf_write_media_preamble(), mov_write_edts_tag(), mov_write_mvhd_tag(), mov_write_tkhd_tag(), rtp_write_header(), and write_packet().
| int64_t ff_gcd | ( | int64_t | a, | |
| int64_t | b | |||
| ) |
Definition at line 59 of file mathematics.c.
| const uint8_t ff_log2_tab[256] |
Initial value:
{
0,0,1,1,2,2,2,2,3,3,3,3,3,3,3,3,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,
5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,5,
6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,
6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,6,
7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,
7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,
7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,
7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7
}
Definition at line 42 of file mathematics.c.
Referenced by av_log2(), av_log2_16bit(), decode_frame(), rtsp_read_header(), and seq_decode_op1().
| const uint8_t ff_sqrt_tab[256] |
Initial value:
{
0, 16, 23, 28, 32, 36, 40, 43, 46, 48, 51, 54, 56, 58, 60, 62, 64, 66, 68, 70, 72, 74, 76, 77, 79, 80, 82, 84, 85, 87, 88, 90,
91, 92, 94, 95, 96, 98, 99,100,102,103,104,105,107,108,109,110,111,112,114,115,116,117,118,119,120,121,122,123,124,125,126,127,
128,129,130,131,132,133,134,135,136,137,138,139,140,141,142,143,144,144,145,146,147,148,149,150,151,151,152,153,154,155,156,156,
157,158,159,160,160,161,162,163,164,164,165,166,167,168,168,169,170,171,171,172,173,174,174,175,176,176,177,178,179,179,180,181,
182,182,183,184,184,185,186,186,187,188,188,189,190,190,191,192,192,193,194,194,195,196,196,197,198,198,199,200,200,201,202,202,
203,204,204,205,205,206,207,207,208,208,209,210,210,211,212,212,213,213,214,215,215,216,216,217,218,218,219,219,220,220,221,222,
222,223,223,224,224,225,226,226,227,227,228,228,229,230,230,231,231,232,232,233,233,234,235,235,236,236,237,237,238,238,239,239,
240,240,241,242,242,243,243,244,244,245,245,246,246,247,247,248,248,249,249,250,250,251,251,252,252,253,253,254,254,255,255,255
}
Definition at line 31 of file mathematics.c.
1.5.8