mirror of
https://github.com/cookiengineer/audacity
synced 2025-04-30 07:39:42 +02:00
117 lines
3.0 KiB
C
117 lines
3.0 KiB
C
/*
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* TwoLAME: an optimized MPEG Audio Layer Two encoder
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*
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* Copyright (C) 2004-2007 The TwoLAME Project
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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* $Id: frontend.h 156 2007-03-20 23:57:35Z nhumfrey $
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*
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <errno.h>
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#include "frontend.h"
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/* We still use libsndfiles' SF_INFO structure for convenience */
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static void print_info_raw(struct audioin_s *audioin)
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{
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fprintf(stderr, "Raw input format: %d channels, %d-bit, %d Hz\n",
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audioin->sfinfo->channels, audioin->samplesize, audioin->sfinfo->samplerate);
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}
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/* Read in some audio samples into buffer */
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static int read_raw(audioin_t * audioin, short *buffer, int samples)
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{
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FILE *file = audioin->file;
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if (audioin->samplesize == 16) {
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return fread(buffer, 2, samples, file);
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} else {
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fprintf(stderr, "Error: sorry %d-bit samples are not supported at the moment.\n",
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audioin->samplesize);
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}
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// Error
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return -1;
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}
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/* Return error string (or NULL) */
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static const char *error_str_raw(audioin_t * audioin)
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{
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FILE *file = audioin->file;
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int error = ferror(file);
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if (error == 0)
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return NULL;
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return strerror(error);
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}
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static int close_raw(audioin_t * audioin)
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{
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FILE *file = audioin->file;
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free(audioin);
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return fclose(file);
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}
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audioin_t *open_audioin_raw(char *filename, SF_INFO * sfinfo, int samplesize)
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{
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audioin_t *audioin = NULL;
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// Allocate memory for structure
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audioin = malloc(sizeof(audioin_t));
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if (audioin == NULL) {
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fprintf(stderr, "Failed to allocate memory for audioin_t structure.\n");
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exit(ERR_MEM_ALLOC);
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}
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// Open the input file by filename
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if (strcmp(filename, "-") == 0) {
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// Use STDIN
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audioin->file = stdin;
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} else {
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audioin->file = fopen(filename, "rb");
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}
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// Check for errors
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if (audioin->file == NULL) {
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fprintf(stderr, "Failed to open input file (%s):\n", filename);
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fprintf(stderr, " %s\n", strerror(errno));
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exit(ERR_OPENING_INPUT);
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}
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// Fill-in data structure
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audioin->samplesize = samplesize;
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audioin->sfinfo = sfinfo;
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audioin->print_info = print_info_raw;
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audioin->read = read_raw;
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audioin->error_str = error_str_raw;
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audioin->close = close_raw;
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return audioin;
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}
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