diff options
Diffstat (limited to 'ext/mplex/yuv4mpeg_ratio.cc')
| -rw-r--r-- | ext/mplex/yuv4mpeg_ratio.cc | 167 |
1 files changed, 0 insertions, 167 deletions
diff --git a/ext/mplex/yuv4mpeg_ratio.cc b/ext/mplex/yuv4mpeg_ratio.cc deleted file mode 100644 index 262df6f9..00000000 --- a/ext/mplex/yuv4mpeg_ratio.cc +++ /dev/null @@ -1,167 +0,0 @@ -/* - * yuv4mpeg_ratio.c: Functions for dealing with y4m_ratio_t datatype. - * - * Copyright (C) 2001 Matthew J. Marjanovic <maddog@mir.com> - * - * - * This program is free software; you can redistribute it and/or - * modify it under the terms of the GNU General Public License - * as published by the Free Software Foundation; either version 2 - * of the License, or (at your option) any later version. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the Free Software - * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. - * - */ - -#include <config.h> - -#include <string.h> -#include "yuv4mpeg.h" -#include "yuv4mpeg_intern.h" - - -/* useful list of standard framerates */ -const y4m_ratio_t y4m_fps_UNKNOWN = Y4M_FPS_UNKNOWN; -const y4m_ratio_t y4m_fps_NTSC_FILM = Y4M_FPS_NTSC_FILM; -const y4m_ratio_t y4m_fps_FILM = Y4M_FPS_FILM; -const y4m_ratio_t y4m_fps_PAL = Y4M_FPS_PAL; -const y4m_ratio_t y4m_fps_NTSC = Y4M_FPS_NTSC; -const y4m_ratio_t y4m_fps_30 = Y4M_FPS_30; -const y4m_ratio_t y4m_fps_PAL_FIELD = Y4M_FPS_PAL_FIELD; -const y4m_ratio_t y4m_fps_NTSC_FIELD = Y4M_FPS_NTSC_FIELD; -const y4m_ratio_t y4m_fps_60 = Y4M_FPS_60; - -/* useful list of standard sample aspect ratios */ -const y4m_ratio_t y4m_sar_UNKNOWN = Y4M_SAR_UNKNOWN; -const y4m_ratio_t y4m_sar_SQUARE = Y4M_SAR_SQUARE; -const y4m_ratio_t y4m_sar_SQR_ANA_16_9 = Y4M_SAR_SQR_ANA_16_9; -const y4m_ratio_t y4m_sar_NTSC_CCIR601 = Y4M_SAR_NTSC_CCIR601; -const y4m_ratio_t y4m_sar_NTSC_16_9 = Y4M_SAR_NTSC_16_9; -const y4m_ratio_t y4m_sar_NTSC_SVCD_4_3 = Y4M_SAR_NTSC_SVCD_4_3; -const y4m_ratio_t y4m_sar_NTSC_SVCD_16_9 = Y4M_SAR_NTSC_SVCD_16_9; -const y4m_ratio_t y4m_sar_PAL_CCIR601 = Y4M_SAR_PAL_CCIR601; -const y4m_ratio_t y4m_sar_PAL_16_9 = Y4M_SAR_PAL_16_9; -const y4m_ratio_t y4m_sar_PAL_SVCD_4_3 = Y4M_SAR_PAL_SVCD_4_3; -const y4m_ratio_t y4m_sar_PAL_SVCD_16_9 = Y4M_SAR_PAL_SVCD_16_9; - -/* useful list of standard display aspect ratios */ -const y4m_ratio_t y4m_dar_4_3 = Y4M_DAR_4_3; -const y4m_ratio_t y4m_dar_16_9 = Y4M_DAR_16_9; -const y4m_ratio_t y4m_dar_221_100 = Y4M_DAR_221_100; - -/* - * Euler's algorithm for greatest common divisor - */ - -static int -gcd (int a, int b) -{ - a = (a >= 0) ? a : -a; - b = (b >= 0) ? b : -b; - - while (b > 0) { - int x = b; - - b = a % b; - a = x; - } - return a; -} - - -/************************************************************************* - * - * Remove common factors from a ratio - * - *************************************************************************/ - - -void -y4m_ratio_reduce (y4m_ratio_t * r) -{ - int d; - - if ((r->n == 0) && (r->d == 0)) - return; /* "unknown" */ - d = gcd (r->n, r->d); - r->n /= d; - r->d /= d; -} - - - -/************************************************************************* - * - * Parse "nnn:ddd" into a ratio - * - * returns: Y4M_OK - success - * Y4M_ERR_RANGE - range error - * - *************************************************************************/ - -int -y4m_parse_ratio (y4m_ratio_t * r, const char *s) -{ - char *t = (char *) strchr (s, ':'); - - if (t == NULL) - return Y4M_ERR_RANGE; - r->n = atoi (s); - r->d = atoi (t + 1); - if (r->d < 0) - return Y4M_ERR_RANGE; - /* 0:0 == unknown, so that is ok, otherwise zero denominator is bad */ - if ((r->d == 0) && (r->n != 0)) - return Y4M_ERR_RANGE; - y4m_ratio_reduce (r); - return Y4M_OK; -} - - - -/************************************************************************* - * - * Guess the true SAR (sample aspect ratio) from a list of commonly - * encountered values, given the "suggested" display aspect ratio, and - * the true frame width and height. - * - * Returns y4m_sar_UNKNOWN if no match is found. - * - *************************************************************************/ - -/* this is big enough to accommodate the difference between 720 and 704 */ -#define GUESS_ASPECT_TOLERANCE 0.03 - -y4m_ratio_t -y4m_guess_sar (int width, int height, y4m_ratio_t dar) -{ - int i; - double implicit_sar = (double) (dar.n * height) / (double) (dar.d * width); - y4m_ratio_t sarray[] = { - y4m_sar_SQUARE, - y4m_sar_NTSC_CCIR601, - y4m_sar_NTSC_16_9, - y4m_sar_NTSC_SVCD_4_3, - y4m_sar_NTSC_SVCD_16_9, - y4m_sar_PAL_CCIR601, - y4m_sar_PAL_16_9, - y4m_sar_PAL_SVCD_4_3, - y4m_sar_PAL_SVCD_16_9, - y4m_sar_UNKNOWN - }; - - for (i = 0; !(Y4M_RATIO_EQL (sarray[i], y4m_sar_UNKNOWN)); i++) { - double ratio = implicit_sar / Y4M_RATIO_DBL (sarray[i]); - - if ((ratio > (1.0 - GUESS_ASPECT_TOLERANCE)) && (ratio < (1.0 + GUESS_ASPECT_TOLERANCE))) - return sarray[i]; - } - return y4m_sar_UNKNOWN; -} |