vorbis/lib/vorbisenc.c

/********************************************************************
 *                                                                  *
 * THIS FILE IS PART OF THE OggVorbis SOFTWARE CODEC SOURCE CODE.   *
 * USE, DISTRIBUTION AND REPRODUCTION OF THIS SOURCE IS GOVERNED BY *
 * THE GNU LESSER/LIBRARY PUBLIC LICENSE, WHICH IS INCLUDED WITH    *
 * THIS SOURCE. PLEASE READ THESE TERMS BEFORE DISTRIBUTING.        *
 *                                                                  *
 * THE OggVorbis SOURCE CODE IS (C) COPYRIGHT 1994-2000             *
 * by Monty <monty@xiph.org> and the XIPHOPHORUS Company            *
 * http://www.xiph.org/                                             *
 *                                                                  *
 ********************************************************************

 function: simple programmatic interface for encoder mode setup
 last mod: $Id: vorbisenc.c,v 1.1.2.3 2000/11/04 06:43:51 xiphmont Exp $

 ********************************************************************/

#include <stdlib.h>
#include <string.h>
#include <math.h>

#include "vorbis/codec.h"
#include "vorbis/vorbisenc.h"

#include "codec_internal.h"
#include "registry.h"
#include "modes/modes.h"

#include "os.h"
#include "misc.h"


/* deepcopy all but the codebooks; in this usage, they're static
   (don't copy as they could be big) */
static void codec_setup_partialcopy(codec_setup_info *ci,
				 codec_setup_info *cs){
  int i;

  memcpy(ci,cs,sizeof(codec_setup_info)); /* to get the flat numbers */

  /* codebooks */
  for(i=0;i<ci->books;i++){
    ci->book_param[i]=cs->book_param[i];
  }

  /* time backend settings */
  for(i=0;i<ci->times;i++){
    ci->time_param[i]=_time_P[ci->time_type[i]]->
      copy_info(cs->time_param[i]);
  }

  /* floor backend settings */
  for(i=0;i<ci->floors;i++){
    ci->floor_param[i]=_floor_P[ci->floor_type[i]]->
      copy_info(cs->floor_param[i]);
  }

  /* residue backend settings */
  for(i=0;i<ci->residues;i++){
    ci->residue_param[i]=_residue_P[ci->residue_type[i]]->
      copy_info(cs->residue_param[i]);
  }

  /* map backend settings */
  for(i=0;i<ci->maps;i++){
    ci->map_param[i]=_mapping_P[ci->map_type[i]]->
      copy_info(cs->map_param[i]);
  }
  
  /* mode settings */
  for(i=0;i<ci->modes;i++){
    ci->mode_param[i]=_ogg_calloc(1,sizeof(vorbis_info_mode));
    ci->mode_param[i]->blockflag=cs->mode_param[i]->blockflag;
    ci->mode_param[i]->windowtype=cs->mode_param[i]->windowtype;
    ci->mode_param[i]->transformtype=cs->mode_param[i]->transformtype;
    ci->mode_param[i]->mapping=cs->mode_param[i]->mapping;
  }

  /* psy settings */
  for(i=0;i<ci->psys;i++){
    ci->psy_param[i]=_vi_psy_copy(cs->psy_param[i]);
  }

}

/* right now, this just encapsultes the old modes behind the interface
   we'll be using from here on out.  After beta 3, the new bitrate
   tracking/modding/tuning engine will lurk inside */
/* encoders will need to use vorbis_info_init beforehand and call
   vorbis_info clear when all done */

int vorbis_encode_init(vorbis_info *vi,
		       long channels,
		       long rate,

		       long max_bitrate,
		       long nominal_bitrate,
		       long min_bitrate){

  long bpch;
  int i,j;
  codec_setup_info *ci=vi->codec_setup;
  codec_setup_info *mode=NULL;
  if(!ci)return(OV_EFAULT);

  vi->version=0;
  vi->channels=channels;
  vi->rate=rate;
  
  vi->bitrate_upper=max_bitrate;
  vi->bitrate_nominal=nominal_bitrate;
  vi->bitrate_lower=min_bitrate;
  vi->bitrate_window=2;

  /* copy a mode into our allocated storage */
  bpch=nominal_bitrate/channels;
  if(bpch<75000){
    /* mode A */
    mode=&info_A;
  }else if(bpch<90000){
    /* mode B */
    mode=&info_B;
  }else if(bpch<110000){
    /* mode C */
    mode=&info_C;
  }else if(bpch<160000){
    /* mode D */
    mode=&info_D;
  }else{
    /* mode E */
    mode=&info_E;
  }

  /* now we have to deepcopy */
  codec_setup_partialcopy(ci,mode);

  /* adjust for sample rate */
  for(i=0;i<ci->floors;i++)
    ((vorbis_info_floor0 *)(ci->floor_param[i]))->rate=rate;

  /* adjust for channels; all our mappings use submap zero now */
  /* yeah, OK, _ogg_calloc did this for us.  But it's a reminder/placeholder */
  for(i=0;i<ci->maps;i++)
    for(j=0;j<channels;j++)
      ((vorbis_info_mapping0 *)ci->map_param[i])->chmuxlist[j]=0;

  return(0);
}

int vorbis_encode_ctl(vorbis_info *vi,int number,void *arg){
  return(OV_EIMPL);
}