path: root/libmpcodecs/ve_xvid4.c

/*****************************************************************************
 *
 *  - XviD 1.x export module for mplayer/mencoder -
 *
 *  Copyright(C) 2003      Marco Belli <elcabesa@inwind.it>
 *               2003-2004 Edouard Gomez <ed.gomez@free.fr>
 *
 *  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
 *
 ****************************************************************************/

/*****************************************************************************
 * Includes
 ****************************************************************************/

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <math.h>
#include <limits.h>
#include <time.h>

#include "../config.h"
#include "../mp_msg.h"

#ifdef HAVE_XVID4

#include "codec-cfg.h"
#include "stream.h"
#include "demuxer.h"
#include "stheader.h"

#include "muxer.h"

#include "img_format.h"
#include "mp_image.h"
#include "vf.h"

#include <xvid.h>
#include <stdio.h>
#include <stdarg.h>
#include <limits.h>
#include <assert.h>

#include "m_option.h"

#define XVID_FIRST_PASS_FILENAME "xvid-twopass.stats"
#define FINE (!0)
#define BAD (!FINE)

#define MAX_ZONES   64

// Profile flag definitions
#define PROFILE_ADAPTQUANT 0x00000001
#define PROFILE_BVOP       0x00000002
#define PROFILE_MPEGQUANT  0x00000004
#define PROFILE_INTERLACE  0x00000008
#define PROFILE_QPEL       0x00000010
#define PROFILE_GMC        0x00000020
#define PROFILE_4MV        0x00000040
#define PROFILE_DXN        0x00000080

// Reduce code duplication in profiles[] array
#define PROFILE_S   (PROFILE_4MV)
#define PROFILE_AS  (PROFILE_4MV|PROFILE_ADAPTQUANT|PROFILE_BVOP|PROFILE_MPEGQUANT|PROFILE_INTERLACE|PROFILE_QPEL|PROFILE_GMC)

typedef struct
{
	char *name;                  ///< profile name
	int id;                      ///< mpeg-4 profile id; iso/iec 14496-2:2001 table G-1
	int width;                   ///< profile width restriction
	int height;                  ///< profile height restriction
	int fps;                     ///< profile frame rate restriction
	int max_objects;             ///< ??????
	int total_vmv_buffer_sz;     ///< macroblock memory; when BVOPS=false, vmv = 2*vcv; when BVOPS=true,  vmv = 3*vcv
	int max_vmv_buffer_sz;       ///< max macroblocks per vop
	int vcv_decoder_rate;        ///< macroblocks decoded per second
	int max_acpred_mbs;          ///< percentage
	int max_vbv_size;            ///< max vbv size (bits) 16368 bits
	int max_video_packet_length; ///< bits
	int max_bitrate;             ///< bits per second
	int vbv_peakrate;            ///< max bits over anyone second period; 0=don't care
	int dxn_max_bframes;         ///< dxn: max consecutive bframes
	unsigned int flags;          ///< flags for allowed options/dxn note the definitions for PROFILE_S and PROFILE_AS
} profile_t;

// Code taken from Libavcodec and ve_lavc.c to handle Aspect Ratio calculation

typedef struct xvid_rational_s{
    int num; 
    int den;
} XVIDRational;

#define MAX(a,b) ((a) > (b) ? (a) : (b))
#define ABS(a) ((a) >= 0 ? (a) : (-(a)))


static int64_t xvid_gcd(int64_t a, int64_t b){
    if(b) return xvid_gcd(b, a%b);
    else  return a;
}

static int xvid_reduce(int *dst_nom, int *dst_den, int64_t nom, int64_t den, int64_t max){
    int exact=1, sign=0;
    int64_t gcd;

    assert(den != 0);

    if(den < 0){
        den= -den;
        nom= -nom;
    }
    
    if(nom < 0){
        nom= -nom;
        sign= 1;
    }
    
    gcd = xvid_gcd(nom, den);
    nom /= gcd;
    den /= gcd;
    
    if(nom > max || den > max){
        XVIDRational a0={0,1}, a1={1,0};
        exact=0;

        for(;;){
            int64_t x= nom / den;
            int64_t a2n= x*a1.num + a0.num;
            int64_t a2d= x*a1.den