gstreamer/ext/tarkin/info.c

/********************************************************************
 *                                                                  *
 * THIS FILE IS PART OF THE OggVorbis SOFTWARE CODEC SOURCE CODE.   *
 * USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS     *
 * GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE *
 * IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING.       *
 *                                                                  *
 * THE OggVorbis SOURCE CODE IS (C) COPYRIGHT 1994-2001             *
 * by the XIPHOPHORUS Company http://www.xiph.org/                  *

 ********************************************************************

 function: maintain the info structure, info <-> header packets
 last mod: $Id$

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

/* general handling of the header and the TarkinInfo structure (and
   substructures) */

#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <ogg/ogg.h>
#include "tarkin.h"
#include "yuv.h"
#include "mem.h"

/* helpers */
static void _v_writestring(oggpack_buffer *o,char *s, int bytes){
  while(bytes--){
    oggpack_write(o,*s++,8);
  }
}

static void _v_readstring(oggpack_buffer *o,char *buf,int bytes){
  while(bytes--){
    *buf++=oggpack_read(o,8);
  }
}

void tarkin_comment_init(TarkinComment *vc){
  memset(vc,0,sizeof(*vc));
}

void tarkin_comment_add(TarkinComment *vc,char *comment){
  vc->user_comments=REALLOC(vc->user_comments,
                            (vc->comments+2)*sizeof(*vc->user_comments));
  vc->comment_lengths=REALLOC(vc->comment_lengths,
                                  (vc->comments+2)*sizeof(*vc->comment_lengths));
  vc->comment_lengths[vc->comments]=strlen(comment);
  vc->user_comments[vc->comments]=MALLOC(vc->comment_lengths[vc->comments]+1);
  strcpy(vc->user_comments[vc->comments], comment);
  vc->comments++;
  vc->user_comments[vc->comments]=NULL;
}

void tarkin_comment_add_tag(TarkinComment *vc, char *tag, char *contents){
  char *comment=alloca(strlen(tag)+strlen(contents)+2); /* +2 for = and \0 */
  strcpy(comment, tag);
  strcat(comment, "=");
  strcat(comment, contents);
  tarkin_comment_add(vc, comment);
}

/* This is more or less the same as strncasecmp - but that doesn't exist
 * everywhere, and this is a fairly trivial function, so we include it */
static int tagcompare(const char *s1, const char *s2, int n){
  int c=0;
  while(c < n){
    if(toupper(s1[c]) != toupper(s2[c]))
      return !0;
    c++;
  }
  return 0;
}

char *tarkin_comment_query(TarkinComment *vc, char *tag, int count){
  long i;
  int found = 0;
  int taglen = strlen(tag)+1; /* +1 for the = we append */
  char *fulltag = alloca(taglen+ 1);

  strcpy(fulltag, tag);
  strcat(fulltag, "=");
  
  for(i=0;i<vc->comments;i++){
    if(!tagcompare(vc->user_comments[i], fulltag, taglen)){
      if(count == found)
        /* We return a pointer to the data, not a copy */
              return vc->user_comments[i] + taglen;
      else
        found++;
    }
  }
  return NULL; /* didn't find anything */
}

int tarkin_comment_query_count(TarkinComment *vc, char *tag){
  int i,count=0;
  int taglen = strlen(tag)+1; /* +1 for the = we append */
  char *fulltag = alloca(taglen+1);
  strcpy(fulltag,tag);
  strcat(fulltag, "=");

  for(i=0;i<vc->comments;i++){
    if(!tagcompare(vc->user_comments[i], fulltag, taglen))
      count++;
  }

  return count;
}

void tarkin_comment_clear(TarkinComment *vc){
  if(vc){
    long i;
    for(i=0;i<vc->comments;i++)
      if(vc->user_comments[i])FREE(vc->user_comments[i]);
    if(vc->user_comments)FREE(vc->user_comments);
        if(vc->comment_lengths)FREE(vc->comment_lengths);
    if(vc->vendor)FREE(vc->vendor);
  }
  memset(vc,0,sizeof(*vc));
}

/* used by synthesis, which has a full, alloced vi */
void tarkin_info_init(TarkinInfo *vi){
  memset(vi,0,sizeof(*vi));
}

void tarkin_info_clear(TarkinInfo *vi){
  memset(vi,0,sizeof(*vi));
}

/* Header packing/unpacking ********************************************/

static int _tarkin_unpack_info(TarkinInfo *vi,oggpack_buffer *opb)
{
#ifdef DBG_OGG
   printf("dbg_ogg: Decoding Info: ");
#endif
   vi->version=oggpack_read(opb,32);
   if(vi->version!=0)return(-TARKIN_VERSION);

   vi->n_layers=oggpack_read(opb,8);
   vi->inter.numerator=oggpack_read(opb,32);
   vi->inter.denominator=oggpack_read(opb,32);
 
   vi->bitrate_upper=oggpack_read(opb,32);
   vi->bitrate_nominal=oggpack_read(opb,32);
   vi->bitrate_lower=oggpack_read(opb,32);

#ifdef DBG_OGG
   printf(" n_layers %d, interleave: %d/%d, ",
                  vi->n_layers, vi->inter.numerator, vi->inter.denominator);
#endif
  
   if(vi->inter.numerator<1)goto err_out;
   if(vi->inter.denominator<1)goto err_out;
   if(vi->n_layers<1)goto err_out;
  
   if(oggpack_read(opb,1)!=1)goto err_out; /* EOP check */

#ifdef DBG_OGG
   printf("Success\n");
#endif
   return(0);
 err_out:
#ifdef DBG_OGG
   printf("Failed\n");
#endif
   tarkin_info_clear(vi);
   return(-TARKIN_BAD_HEADER);
}

static int _tarkin_unpack_comment(TarkinComment *vc,oggpack_buffer *opb)
{
   int i;
   int vendorlen=oggpack_read(opb,32);

#ifdef DBG_OGG
   printf("dbg_ogg: Decoding comment: ");
#endif
   if(vendorlen<0)goto err_out;
   vc->vendor=_ogg_calloc(vendorlen+1,1);
   _v_readstring(opb,vc->vendor,vendorlen);
   vc->comments=oggpack_read(opb,32);
   if(vc->comments<0)goto err_out;
   vc->user_comments=_ogg_calloc(vc->comments+1,sizeof(*vc->user_comments));
   vc->comment_lengths=_ogg_calloc(vc->comments+1,
                                        sizeof(*vc->comment_lengths));
            
   for(i=0;i<vc->comments;i++){
      int len=oggpack_read(opb,32);
      if(len<0)goto err_out;
      vc->comment_lengths[i]=len;
      vc->user_comments[i]=_ogg_calloc(len+1,1);
      _v_readstring(opb,vc->user_comments[i],len);
   }          
   if(oggpack_read(opb,1)!=1)goto err_out; /* EOP check */

#ifdef DBG_OGG
   printf("Success, read %d comments\n", vc->comments);
#endif
   return(0);
 err_out:
#ifdef DBG_OGG
   printf("Failed\n");
#endif
   tarkin_comment_clear(vc);
   return(-TARKIN_BAD_HEADER);
}

/*  the real encoding details are here, currently TarkinVideoLayerDesc. */
static int _tarkin_unpack_layer_desc(TarkinInfo *vi,oggpack_buffer *opb){
  int i,j;
  vi->layer = CALLOC (vi->n_layers, (sizeof(*vi->layer)));
  memset(vi->layer,0, vi->n_layers * sizeof(*vi->layer));

#ifdef DBG_OGG
  printf("ogg: Decoding layers description: ");
#endif
  for(i=0;i<vi->n_layers;i++){
    TarkinVideoLayer *layer = vi->layer + i;
    layer->desc.width = oggpack_read(opb,32);
    layer->desc.height = oggpack_read(opb,32);
    layer->desc.a_moments = oggpack_read(opb,32);
    layer->desc.s_moments = oggpack_read(opb,32);
    layer->desc.frames_per_buf = oggpack_read(opb,32);
    layer->desc.bitstream_len = oggpack_read(opb,32);
    layer->desc.format = oggpack_read(opb,32);

    switch (layer->desc.format) {
    case TARKIN_GRAYSCALE:
       layer->n_comp = 1;
       layer->color_fwd_xform = grayscale_to_y;
       layer->color_inv_xform = y_to_grayscale;
       break;
    case TARKIN_RGB24:
       layer->n_comp = 3;
       layer->color_fwd_xform = rgb24_to_yuv;
       layer->color_inv_xform = yuv_to_rgb24;
       break;
    case TARKIN_RGB32:
       layer->n_comp = 3;
       layer->color_fwd_xform = rgb32_to_yuv;
       layer->color_inv_xform = yuv_to_rgb32;
       break;
    case TARKIN_RGBA:
       layer->n_comp = 4;
       layer->color_fwd_xform = rgba_to_yuv;
       layer->color_inv_xform = yuv_to_rgba;
       break;
    default:
       return -TARKIN_INVALID_COLOR_FORMAT;
    };

    layer->waveletbuf = (Wavelet3DBuf**) CALLOC (layer->n_comp,
                                                 sizeof(Wavelet3DBuf*));

    layer->packet =  MALLOC (layer->n_comp * sizeof(*layer->packet));
    memset(layer->packet, 0, layer->n_comp * sizeof(*layer->packet));
   
    for (j=0; j<layer->n_comp; j++){
       layer->waveletbuf[j] = wavelet_3d_buf_new (layer->desc.width,
                                                  layer->desc.height,
                                                  layer->desc.frames_per_buf);
       layer->packet[j].data = MALLOC(layer->desc.bitstream_len);
       layer->packet[j].storage = layer->desc.bitstream_len;
    }

    vi->max_bitstream_len += layer->desc.bitstream_len
        + 2 * 10 * sizeof(uint32_t) * layer->n_comp;    /* truncation tables  */

#ifdef DBG_OGG
    printf("\n     layer%d: size %dx%dx%d, format %d, a_m %d, s_m %d, %d fpb\n",
          i, layer->desc.width, layer->desc.height, layer->n_comp,
	  layer->desc.format, layer->desc.a_moments, layer->desc.s_moments,
	  layer->desc.frames_per_buf);
#endif
  } /* for each layer */
  
  if(oggpack_read(opb,1)!=1)goto err_out; /* EOP check */

#ifdef DBG_OGG
  printf("Success\n");
#endif
   
  return(0);
 err_out:
#ifdef DBG_OGG
  printf("Failed\n");
#endif
  tarkin_info_clear(vi);
  return(-TARKIN_BAD_HEADER);
}

/* The Tarkin header is in three packets; the initial small packet in
   the first page that identifies basic parameters, a second packet
   with bitstream comments and a third packet that holds the
   layer description structures. */

TarkinError tarkin_synthesis_headerin(TarkinInfo *vi,TarkinComment *vc,ogg_packet *op){
  oggpack_buffer opb;
  
  if(op){
    oggpack_readinit(&opb,op->packet,op->bytes);

    /* Which of the three types of header is this? */
    /* Also verify header-ness, tarkin */
    {
      char buffer[6];
      int packtype=oggpack_read(&opb,8);
      memset(buffer,0,6);
      _v_readstring(&opb,buffer,6);
      if(memcmp(buffer,"tarkin",6)){
        /* not a tarkin header */
        return(-TARKIN_NOT_TARKIN);
      }
      switch(packtype){
      case 0x01: /* least significant *bit* is read first */
        if(!op->b_o_s){
          /* Not the initial packet */
          return(-TARKIN_BAD_HEADER);
        }
        if(vi->inter.numerator!=0){
          /* previously initialized info header */
          return(-TARKIN_BAD_HEADER);
        }

        return(_tarkin_unpack_info(vi,&opb));

      case 0x03: /* least significant *bit* is read first */
        if(vi->inter.denominator==0){
          /* um... we didn't get the initial header */
          return(-TARKIN_BAD_HEADER);
        }

        return(_tarkin_unpack_comment(vc,&opb));

      case 0x05: /* least significant *bit* is read first */
        if(vi->inter.numerator == 0 || vc->vendor==NULL){
          /* um... we didn;t get the initial header or comments yet */
          return(-TARKIN_BAD_HEADER);
        }

        return(_tarkin_unpack_layer_desc(vi,&opb));

      default:
        /* Not a valid tarkin header type */
        return(-TARKIN_BAD_HEADER);
        break;
      }
    }
  }
  return(-TARKIN_BAD_HEADER);
}

/* pack side **********************************************************/

static int _tarkin_pack_info(oggpack_buffer *opb,TarkinInfo *vi){

  /* preamble */  
  oggpack_write(opb,0x01,8);
  _v_writestring(opb,"tarkin", 6);

  /* basic information about the stream */
  oggpack_write(opb,0x00,32);
  oggpack_write(opb,vi->n_layers,8);
  oggpack_write(opb,vi->inter.numerator,32);
  oggpack_write(opb,vi->inter.denominator,32);

  oggpack_write(opb,vi->bitrate_upper,32);
  oggpack_write(opb,vi->bitrate_nominal,32);
  oggpack_write(opb,vi->bitrate_lower,32);

  oggpack_write(opb,1,1);

#ifdef DBG_OGG
  printf("dbg_ogg: Putting out info, inter %d/%d, n_layers %d\n",
               vi->inter.numerator,vi->inter.denominator,vi->n_layers);
#endif
  return(0);
}

static int _tarkin_pack_comment(oggpack_buffer *opb,TarkinComment *vc){
  char temp[]="libTarkin debugging edition 20011104";
  int bytes = strlen(temp);

  /* preamble */  
  oggpack_write(opb,0x03,8);
  _v_writestring(opb,"tarkin", 6);

  /* vendor */
  oggpack_write(opb,bytes,32);
  _v_writestring(opb,temp, bytes);
  
  /* comments */

  oggpack_write(opb,vc->comments,32);
  if(vc->comments){
    int i;
    for(i=0;i<vc->comments;i++){
      if(vc->user_comments[i]){
        oggpack_write(opb,vc->comment_lengths[i],32);
        _v_writestring(opb,vc->user_comments[i], vc->comment_lengths[i]);
      }else{
        oggpack_write(opb,0,32);
      }
    }
  }
  oggpack_write(opb,1,1);

#ifdef DBG_OGG
  printf("dbg_ogg: Putting out %d comments\n", vc->comments);
#endif
  
  return(0);
}
 
static int _tarkin_pack_layer_desc(oggpack_buffer *opb,TarkinInfo *vi)
{
  int i;
  TarkinVideoLayer *layer;

#ifdef DBG_OGG
  printf("dbg_ogg: Putting out layers description:\n");
#endif

  oggpack_write(opb,0x05,8);
  _v_writestring(opb,"tarkin", 6);

  for(i=0;i<vi->n_layers;i++){
    layer = vi->layer + i;
    oggpack_write(opb,layer->desc.width,32);
    oggpack_write(opb,layer->desc.height,32);
    oggpack_write(opb,layer->desc.a_moments,32);
    oggpack_write(opb,layer->desc.s_moments,32);
    oggpack_write(opb,layer->desc.frames_per_buf,32);
    oggpack_write(opb,layer->desc.bitstream_len,32);
    oggpack_write(opb,layer->desc.format,32);

#ifdef DBG_OGG
    printf("       res. %dx%d, format %d, a_m %d, s_m %d, fpb %d\n",
              layer->desc.width, layer->desc.height, layer->desc.format,
	      layer->desc.a_moments, layer->desc.s_moments, 
	      layer->desc.frames_per_buf);
#endif
    
  }
  oggpack_write(opb,1,1);

#ifdef DBG_OGG
  printf("      wrote %ld bytes.\n", oggpack_bytes(opb));
#endif
  
  return(0);
} 

int tarkin_comment_header_out(TarkinComment *vc, ogg_packet *op)
{

  oggpack_buffer opb;

  oggpack_writeinit(&opb);
  if(_tarkin_pack_comment(&opb,vc)) return -TARKIN_NOT_IMPLEMENTED;

  op->packet = MALLOC(oggpack_bytes(&opb));
  memcpy(op->packet, opb.buffer, oggpack_bytes(&opb));

  op->bytes=oggpack_bytes(&opb);
  op->b_o_s=0;
  op->e_o_s=0;
  op->granulepos=0;

  return 0;
}

TarkinError tarkin_analysis_headerout(TarkinStream *v,
                              TarkinComment *vc,
                              ogg_packet *op,
                              ogg_packet *op_comm,
                              ogg_packet *op_code)
{
   int ret=-TARKIN_NOT_IMPLEMENTED;
   TarkinInfo * vi;
   oggpack_buffer opb;
   tarkin_header_store *b=&v->headers;

   vi = v->ti;

   /* first header packet **********************************************/

   oggpack_writeinit(&opb);
   if(_tarkin_pack_info(&opb,vi))goto err_out;

   /* build the packet */
   if(b->header)FREE(b->header);
   b->header=MALLOC(oggpack_bytes(&opb));
   memcpy(b->header,opb.buffer,oggpack_bytes(&opb));
   op->packet=b->header;
   op->bytes=oggpack_bytes(&opb);
   op->b_o_s=1;
   op->e_o_s=0;
   op->granulepos=0;

   /* second header packet (comments) **********************************/

   oggpack_reset(&opb);
   if(_tarkin_pack_comment(&opb,vc))goto err_out;

   if(b->header1)FREE(b->header1);
   b->header1=MALLOC(oggpack_bytes(&opb));
   memcpy(b->header1,opb.buffer,oggpack_bytes(&opb));
   op_comm->packet=b->header1;
   op_comm->bytes=oggpack_bytes(&opb);
   op_comm->b_o_s=0;
   op_comm->e_o_s=0;
   op_comm->granulepos=0;

   /* third header packet (modes/codebooks) ****************************/

   oggpack_reset(&opb);
   if(_tarkin_pack_layer_desc(&opb,vi))goto err_out;

   if(b->header2)FREE(b->header2);
   b->header2=MALLOC(oggpack_bytes(&opb));
   memcpy(b->header2,opb.buffer,oggpack_bytes(&opb));
   op_code->packet=b->header2;
   op_code->bytes=oggpack_bytes(&opb);
   op_code->b_o_s=0;
   op_code->e_o_s=0;
   op_code->granulepos=0;

   oggpack_writeclear(&opb);
   return(0);
 err_out:
   oggpack_writeclear(&opb);
   memset(op,0,sizeof(*op));
   memset(op_comm,0,sizeof(*op_comm));
   memset(op_code,0,sizeof(*op_code));

   if(b->header)FREE(b->header);
   if(b->header1)FREE(b->header1);
   if(b->header2)FREE(b->header2);
   b->header=NULL;
   b->header1=NULL;
   b->header2=NULL;
   return(ret);
}