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cdda.c

/* wavbreaker - A tool to split a wave file up into multiple wave.
 * Copyright (C) 2002 Timothy Robinson
 *
 * 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 <stdio.h>
#include <sys/stat.h>
#include "cdda.h"

unsigned long file_size;

int
cdda_read_header(const char *filename,
                 SampleInfo *sampleInfo)
{
      struct stat statBuf;

      if (stat(filename, &statBuf)) {
            printf("error stat'ing %s\n", filename);
            return -1;
      }

      file_size = statBuf.st_size;

      sampleInfo->numBytes = statBuf.st_size;
      sampleInfo->channels = 2; 
      sampleInfo->samplesPerSec = 44100;
      sampleInfo->bitsPerSample = 16;
        sampleInfo->avgBytesPerSec = sampleInfo->bitsPerSample/8 * sampleInfo->samplesPerSec * sampleInfo->channels;
        sampleInfo->blockAlign = 4;

      return 0;
}

int
cdda_read_sample(FILE *fp,
                 unsigned char *buf,
                 int buf_size,
                 unsigned long start_pos)
{
      int i = 0;
      int ret;

      if (fseek(fp, start_pos, SEEK_SET)) {
            return -1;
      }

      if (start_pos > file_size) {
            return -1;
      }

      ret = fread(buf, 1, buf_size, fp);

      for (i = 0; i < ret / 4; i++) {
            unsigned char tmp;

            /* left channel */
            tmp = buf[i*4+0];
            buf[i*4+0] = buf[i*4+1];
            buf[i*4+1] = tmp;

            /* right channel */
            tmp = buf[i*4+2];
            buf[i*4+2] = buf[i*4+3];
            buf[i*4+3] = tmp;
      }

      return ret;
}

int
cdda_write_file(FILE *fp,
                char *filename,
                int buf_size,
                unsigned long start_pos,
                unsigned long end_pos)
{
      int ret;
      FILE *new_fp;
      unsigned long cur_pos;
      unsigned char buf[buf_size];

      if ((new_fp = fopen(filename, "wb")) == NULL) {
            printf("error opening %s for writing\n", filename);
            return -1;
      }

      cur_pos = start_pos;

      if (fseek(fp, cur_pos, SEEK_SET)) {
            fclose(new_fp);
            return -1;
      }

      if (cur_pos > file_size) {
            fclose(new_fp);
            return -1;
      }

      /* DEBUG CODE START */
      
      printf("start_pos: %lu\n", start_pos);
      printf("end_pos: %lu\n", end_pos);
      printf("cur_pos: %lu\n", cur_pos);
      
      /* DEBUG CODE END */

      if (cur_pos + buf_size > end_pos && end_pos != 0) {
            buf_size = end_pos - cur_pos;
      }
      while ((ret = fread(buf, 1, buf_size, fp)) > 0 &&
                        (cur_pos < end_pos || end_pos == 0)) {

            if ((fwrite(buf, 1, ret, new_fp)) < ret) {
                  printf("error writing to file %s\n", filename);
                  fclose(new_fp);
                  return -1;
            }
            cur_pos += ret;

            if (cur_pos + buf_size > end_pos && end_pos != 0) {
                  buf_size = end_pos - cur_pos;
            }
      }

      /* DEBUG CODE START */
      printf("cur_pos: %lu\n", cur_pos);
      printf("done writing - %s\n\n", filename);
      /* DEBUG CODE END */

      fclose(new_fp);
      return ret;
}

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