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Pull out of mp3-scanner.c
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113
src/scan-wav.c
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113
src/scan-wav.c
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/*
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* $Id$
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*
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* Copyright (C) 2003 Ron Pedde (ron@pedde.com)
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program 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
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; 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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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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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 <fcntl.h>
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#include "err.h"
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#include "mp3-scanner.h"
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#define GET_WAV_INT32(p) ((((unsigned long)((p)[3])) << 24) | \
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(((unsigned long)((p)[2])) << 16) | \
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(((unsigned long)((p)[1])) << 8) | \
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(((unsigned long)((p)[0]))))
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#define GET_WAV_INT16(p) ((((unsigned long)((p)[1])) << 8) | \
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(((unsigned long)((p)[0]))))
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/**
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* Get info from the actual wav headers. Since there is no
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* metainfo in .wav files (or at least know standard I
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* know about), this merely gets duration, bitrate, etc.
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*
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* @param file file to scan
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* @param pmp3 MP3FILE struct to be filled
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*/
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int scan_get_wavinfo(char *file, MP3FILE *pmp3) {
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FILE *infile;
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size_t rl;
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unsigned char hdr[44];
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unsigned long chunk_data_length;
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unsigned long format_data_length;
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unsigned long compression_code;
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unsigned long channel_count;
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unsigned long sample_rate;
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unsigned long sample_bit_length;
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unsigned long bit_rate;
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unsigned long data_length;
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unsigned long sec, ms;
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DPRINTF(E_DBG,L_SCAN,"Getting WAV file info\n");
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if(!(infile=fopen(file,"rb"))) {
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DPRINTF(E_WARN,L_SCAN,"Could not open %s for reading\n",file);
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return -1;
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}
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fseek(infile,0,SEEK_END);
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pmp3->file_size = ftell(infile);
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fseek(infile,0,SEEK_SET);
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rl = fread(hdr, 1, 44, infile);
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fclose(infile);
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if (rl != 44) {
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DPRINTF(E_WARN,L_SCAN,"Could not read wav header from %s\n",file);
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return -1;
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}
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if (strncmp((char*)hdr + 0, "RIFF", 4) ||
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strncmp((char*)hdr + 8, "WAVE", 4) ||
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strncmp((char*)hdr + 12, "fmt ", 4) ||
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strncmp((char*)hdr + 36, "data", 4)) {
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DPRINTF(E_WARN,L_SCAN,"Invalid wav header in %s\n",file);
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return -1;
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}
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chunk_data_length = GET_WAV_INT32(hdr + 4);
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format_data_length = GET_WAV_INT32(hdr + 16);
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compression_code = GET_WAV_INT16(hdr + 20);
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channel_count = GET_WAV_INT16(hdr + 22);
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sample_rate = GET_WAV_INT32(hdr + 24);
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sample_bit_length = GET_WAV_INT16(hdr + 34);
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data_length = GET_WAV_INT32(hdr + 40);
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if ((format_data_length != 16) ||
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(compression_code != 1) ||
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(channel_count < 1)) {
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DPRINTF(E_WARN,L_SCAN,"Invalid wav header in %s\n",file);
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return -1;
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}
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bit_rate = sample_rate * channel_count * ((sample_bit_length + 7) / 8) * 8;
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pmp3->bitrate = bit_rate / 1000;
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pmp3->samplerate = sample_rate;
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sec = data_length / (bit_rate / 8);
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ms = ((data_length % (bit_rate / 8)) * 1000) / (bit_rate / 8);
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pmp3->song_length = (sec * 1000) + ms;
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return 0;
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}
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