Pull out of mp3-scanner.c

2005-06-01 03:04:43 +00:00 · 2005-06-01 03:04:43 +00:00 · 6f3fb9dba7
parent 443afc5a76
commit 6f3fb9dba7
1 changed files with 113 additions and 0 deletions
--- a/src/scan-wav.c
+++ b/src/scan-wav.c
@ -0,0 +1,113 @@
+/*
+ * $Id$
+ *
+ * Copyright (C) 2003 Ron Pedde (ron@pedde.com)
+ *
+ * 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
+ */
+
+#ifdef HAVE_CONFIG_H
+#  include "config.h"
+#endif
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <fcntl.h>
+
+#include "err.h"
+#include "mp3-scanner.h"
+
+#define GET_WAV_INT32(p) ((((unsigned long)((p)[3])) << 24) |	\
+		          (((unsigned long)((p)[2])) << 16) |	\
+		          (((unsigned long)((p)[1])) << 8) |	\
+		          (((unsigned long)((p)[0]))))
+
+#define GET_WAV_INT16(p) ((((unsigned long)((p)[1])) << 8) |	\
+		          (((unsigned long)((p)[0]))))
+
+/**
+ * Get info from the actual wav headers.  Since there is no
+ * metainfo in .wav files (or at least know standard I
+ * know about), this merely gets duration, bitrate, etc.
+ *
+ * @param file file to scan
+ * @param pmp3 MP3FILE struct to be filled
+ */
+int scan_get_wavinfo(char *file, MP3FILE *pmp3) {
+    FILE *infile;
+    size_t rl;
+    unsigned char hdr[44];
+    unsigned long chunk_data_length;
+    unsigned long format_data_length;
+    unsigned long compression_code;
+    unsigned long channel_count;
+    unsigned long sample_rate;
+    unsigned long sample_bit_length;
+    unsigned long bit_rate;
+    unsigned long data_length;
+    unsigned long sec, ms;
+
+    DPRINTF(E_DBG,L_SCAN,"Getting WAV file info\n");
+
+    if(!(infile=fopen(file,"rb"))) {
+	DPRINTF(E_WARN,L_SCAN,"Could not open %s for reading\n",file);
+	return -1;
+    }
+
+    fseek(infile,0,SEEK_END);
+    pmp3->file_size = ftell(infile);
+    fseek(infile,0,SEEK_SET);
+
+    rl = fread(hdr, 1, 44, infile);
+    fclose(infile);
+    if (rl != 44) {
+	DPRINTF(E_WARN,L_SCAN,"Could not read wav header from %s\n",file);
+        return -1;
+    }
+
+    if (strncmp((char*)hdr + 0, "RIFF", 4) ||
+	strncmp((char*)hdr + 8, "WAVE", 4) ||
+	strncmp((char*)hdr + 12, "fmt ", 4) ||
+	strncmp((char*)hdr + 36, "data", 4)) {
+	DPRINTF(E_WARN,L_SCAN,"Invalid wav header in %s\n",file);
+        return -1;
+    }
+
+    chunk_data_length = GET_WAV_INT32(hdr + 4);
+    format_data_length = GET_WAV_INT32(hdr + 16);
+    compression_code = GET_WAV_INT16(hdr + 20);
+    channel_count = GET_WAV_INT16(hdr + 22);
+    sample_rate = GET_WAV_INT32(hdr + 24);
+    sample_bit_length = GET_WAV_INT16(hdr + 34);
+    data_length = GET_WAV_INT32(hdr + 40);
+
+    if ((format_data_length != 16) ||
+	(compression_code != 1) ||
+	(channel_count < 1)) {
+	DPRINTF(E_WARN,L_SCAN,"Invalid wav header in %s\n",file);
+        return -1;
+    }
+
+    bit_rate = sample_rate * channel_count * ((sample_bit_length + 7) / 8) * 8;
+    pmp3->bitrate = bit_rate / 1000;
+    pmp3->samplerate = sample_rate;
+    sec = data_length / (bit_rate / 8);
+    ms = ((data_length % (bit_rate / 8)) * 1000) / (bit_rate / 8);
+    pmp3->song_length = (sec * 1000) + ms;
+
+    return 0;
+}
+