oggpagesizes.c

// compile with gcc -o oggpagesizes -logg oggpagesizes.c

#include <stdio.h>
#include <ogg/ogg.h>

ogg_sync_state oss;
ogg_stream_state os;
int serialno = -1;

int main(int argc, char *argv[]){
  if(argc < 2){
    printf("no file\n");
    return -1;
  }
  FILE *f = fopen(argv[1], "r");
  if(!f){
    printf("fopen fail\n");
    return -1;
  }
  ogg_sync_init(&oss);
  ogg_stream_init(&os, -1);
  int maxbody = 0;
  int maxpacket = 0;
  while(!feof(f)){
    char *buf = ogg_sync_buffer(&oss, 8192);
    int read = fread(buf, 1, 8192, f);
    ogg_sync_wrote(&oss, read);

    while(1){
      ogg_page op;
      int res = ogg_sync_pageout(&oss, &op);
      if(res == 1){
    printf("header %d body %d\n", op.header_len, op.body_len);
    maxbody = op.body_len > maxbody ? op.body_len : maxbody;
    if(serialno != ogg_page_serialno(&op)){
      printf("now reading serialno %d\n", serialno);
      serialno = ogg_page_serialno(&op);
      ogg_stream_reset_serialno(&os, serialno);
    }
    int res = ogg_stream_pagein(&os, &op);
    printf("ogg_stream_pagein %d\n", res);
    while(1){
      ogg_packet opkt;
      int res = ogg_stream_packetout(&os, &opkt);
      if(res == 1){
        printf("    packet %d\n", opkt.bytes);
        maxpacket = opkt.bytes > maxpacket ? opkt.bytes : maxpacket;
      }else{
        printf("ogg_stream_packetout %d\n", res);
        break;
      }
    }
      }else{
    break;
      }
    }
  }
  printf("max body %d\n", maxbody);
  printf("max packet %d\n", maxpacket);
  return 0;
}