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/*
* TwoLAME: an optimized MPEG Audio Layer Two encoder
*
* Copyright (C) 2004-2007 The TwoLAME Project
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* $Id: frontend.h 156 2007-03-20 23:57:35Z nhumfrey $
*
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include "frontend.h"
/* We still use libsndfiles' SF_INFO structure for convenience */
static void print_info_raw(struct audioin_s *audioin)
{
fprintf(stderr, "Raw input format: %d channels, %d-bit, %d Hz\n",
audioin->sfinfo->channels, audioin->samplesize, audioin->sfinfo->samplerate);
}
/* Read in some audio samples into buffer */
static int read_raw(audioin_t * audioin, short *buffer, int samples)
{
FILE *file = audioin->file;
if (audioin->samplesize == 16) {
return fread(buffer, 2, samples, file);
} else {
fprintf(stderr, "Error: sorry %d-bit samples are not supported at the moment.\n",
audioin->samplesize);
}
// Error
return -1;
}
/* Return error string (or NULL) */
static const char *error_str_raw(audioin_t * audioin)
{
FILE *file = audioin->file;
int error = ferror(file);
if (error == 0)
return NULL;
return strerror(error);
}
static int close_raw(audioin_t * audioin)
{
FILE *file = audioin->file;
free(audioin);
return fclose(file);
}
audioin_t *open_audioin_raw(char *filename, SF_INFO * sfinfo, int samplesize)
{
audioin_t *audioin = NULL;
// Allocate memory for structure
audioin = malloc(sizeof(audioin_t));
if (audioin == NULL) {
fprintf(stderr, "Failed to allocate memory for audioin_t structure.\n");
exit(ERR_MEM_ALLOC);
}
// Open the input file by filename
if (strcmp(filename, "-") == 0) {
// Use STDIN
audioin->file = stdin;
} else {
audioin->file = fopen(filename, "rb");
}
// Check for errors
if (audioin->file == NULL) {
fprintf(stderr, "Failed to open input file (%s):\n", filename);
fprintf(stderr, " %s\n", strerror(errno));
exit(ERR_OPENING_INPUT);
}
// Fill-in data structure
audioin->samplesize = samplesize;
audioin->sfinfo = sfinfo;
audioin->print_info = print_info_raw;
audioin->read = read_raw;
audioin->error_str = error_str_raw;
audioin->close = close_raw;
return audioin;
}
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