[a60601]: tagutils / tagutils-wav.c  Maximize  Restore  History

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//=========================================================================
// FILENAME : tagutils-wav.c
// DESCRIPTION : WAV metadata reader
//=========================================================================
// Copyright (c) 2009 NETGEAR, Inc. All Rights Reserved.
// based on software from Ron Pedde's FireFly Media Server project
//=========================================================================
/*
* 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, see <http://www.gnu.org/licenses/>.
*/
#define GET_WAV_INT32(p) ((((uint8_t)((p)[3])) << 24) | \
(((uint8_t)((p)[2])) << 16) | \
(((uint8_t)((p)[1])) << 8) | \
(((uint8_t)((p)[0]))))
#define GET_WAV_INT16(p) ((((uint8_t)((p)[1])) << 8) | \
(((uint8_t)((p)[0]))))
static int
_get_wavtags(char *filename, struct song_metadata *psong)
{
int fd;
uint32_t len;
unsigned char hdr[12];
unsigned char fmt[16];
//uint32_t chunk_data_length;
uint32_t format_data_length = 0;
uint32_t compression_code = 0;
uint32_t channel_count = 0;
uint32_t sample_rate = 0;
uint32_t sample_bit_length = 0;
uint32_t bit_rate;
uint32_t data_length = 0;
uint32_t sec, ms;
uint32_t current_offset;
uint32_t block_len;
//DEBUG DPRINTF(E_DEBUG,L_SCANNER,"Getting WAV file info\n");
if(!(fd = open(filename, O_RDONLY)))
{
DPRINTF(E_WARN, L_SCANNER, "Could not create file handle\n");
return -1;
}
len = 12;
if(!(len = read(fd, hdr, len)) || (len != 12))
{
DPRINTF(E_WARN, L_SCANNER, "Could not read wav header from %s\n", filename);
close(fd);
return -1;
}
/* I've found some wav files that have INFO tags
* in them... */
if(strncmp((char*)hdr + 0, "RIFF", 4) ||
strncmp((char*)hdr + 8, "WAVE", 4))
{
DPRINTF(E_WARN, L_SCANNER, "Invalid wav header in %s\n", filename);
close(fd);
return -1;
}
//chunk_data_length = GET_WAV_INT32(hdr + 4);
/* now, walk through the chunks */
current_offset = 12;
while(current_offset + 8 < psong->file_size)
{
len = 8;
if(!(len = read(fd, hdr, len)) || (len != 8))
{
close(fd);
DPRINTF(E_WARN, L_SCANNER, "Error reading block: %s\n", filename);
return -1;
}
current_offset += 8;
block_len = GET_WAV_INT32(hdr + 4);
//DEBUG DPRINTF(E_DEBUG, L_SCANNER, "Read block %02x%02x%02x%02x (%c%c%c%c) of "
// "size 0x%08x\n",hdr[0],hdr[1],hdr[2],hdr[3],
// isprint(hdr[0]) ? hdr[0] : '?',
// isprint(hdr[1]) ? hdr[1] : '?',
// isprint(hdr[2]) ? hdr[2] : '?',
// isprint(hdr[3]) ? hdr[3] : '?',
// block_len);
if(block_len > psong->file_size)
{
close(fd);
DPRINTF(E_WARN, L_SCANNER, "Bad block len: %s\n", filename);
return -1;
}
if(strncmp((char*)&hdr, "fmt ", 4) == 0)
{
//DEBUG DPRINTF(E_DEBUG,L_SCANNER,"Found 'fmt ' header\n");
len = 16;
if(!read(fd, fmt, len) || (len != 16))
{
close(fd);
DPRINTF(E_WARN, L_SCANNER, "Bad .wav file: can't read fmt: %s\n",
filename);
return -1;
}
format_data_length = block_len;
compression_code = GET_WAV_INT16(fmt);
channel_count = GET_WAV_INT16(fmt + 2);
sample_rate = GET_WAV_INT32(fmt + 4);
sample_bit_length = GET_WAV_INT16(fmt + 14);
//DEBUG DPRINTF(E_DEBUG,L_SCANNER,"Compression code: %d\n",compression_code);
//DEBUG DPRINTF(E_DEBUG,L_SCANNER,"Channel count: %d\n",channel_count);
//DEBUG DPRINTF(E_DEBUG,L_SCANNER,"Sample Rate: %d\n",sample_rate);
//DEBUG DPRINTF(E_DEBUG,L_SCANNER,"Sample bit length %d\n",sample_bit_length);
}
else if(strncmp((char*)&hdr, "data", 4) == 0)
{
//DEBUG DPRINTF(E_DEBUG,L_SCANNER,"Found 'data' header\n");
data_length = block_len;
goto next_block;
}
else if(strncmp((char*)&hdr, "LIST", 4) == 0)
{
char *tags;
char *p;
int off;
uint32_t taglen;
char **m;
len = GET_WAV_INT32(hdr + 4);
if(len > 65536 || len < 9)
goto next_block;
tags = malloc(len+1);
if(!tags)
goto next_block;
if(read(fd, tags, len) < len ||
strncmp(tags, "INFO", 4) != 0)
{
free(tags);
goto next_block;
}
tags[len] = '\0';
off = 4;
p = tags + off;
while(off < len - 8)
{
taglen = GET_WAV_INT32(p + 4);
//DEBUG DPRINTF(E_DEBUG, L_SCANNER, "%.*s: %.*s (%d)\n", 4, p, taglen, p + 8, taglen);
m = NULL;
if (taglen > 2048) {
DPRINTF(E_WARN, L_SCANNER, "Ignoring long tag [%.*s] in %s\n",
4, p+8, filename);
}
else if(strncmp(p, "INAM", 4) == 0)
m = &(psong->title);
else if(strncmp(p, "IALB", 4) == 0 ||
strncmp(p, "IPRD", 4) == 0)
m = &(psong->album);
else if(strncmp(p, "IGRE", 4) == 0 ||
strncmp(p, "IGNR", 4) == 0)
m = &(psong->genre);
else if(strncmp(p, "ICMT", 4) == 0)
m = &(psong->comment);
else if(strncmp(p, "IART", 4) == 0)
m = &(psong->contributor[ROLE_TRACKARTIST]);
else if(strncmp(p, "IAAR", 4) == 0)
m = &(psong->contributor[ROLE_ALBUMARTIST]);
else if(strncmp(p, "ICOM", 4) == 0 ||
strncmp(p, "IMUS", 4) == 0)
m = &(psong->contributor[ROLE_COMPOSER]);
else if(strncasecmp(p, "ITRK", 4) == 0)
psong->track = atoi(p + 8);
else if(strncmp(p, "ICRD", 4) == 0 ||
strncmp(p, "IYER", 4) == 0)
psong->year = atoi(p + 8);
if(m)
{
*m = malloc(taglen + 1);
strncpy(*m, p + 8, taglen);
(*m)[taglen] = '\0';
}
p += taglen + 8;
off += taglen + 8;
/* Handle some common WAV file malformations */
while (*p == '\0' && off < len) {
p++;
off++;
}
}
free(tags);
}
next_block:
lseek(fd, current_offset + block_len, SEEK_SET);
current_offset += block_len;
}
close(fd);
if(((format_data_length != 16) && (format_data_length != 18)) ||
(compression_code != 1) ||
(channel_count < 1))
{
DPRINTF(E_WARN, L_SCANNER, "Invalid wav header in %s\n", filename);
return -1;
}
if( !data_length )
data_length = psong->file_size - 44;
bit_rate = sample_rate * channel_count * ((sample_bit_length + 7) / 8) * 8;
psong->bitrate = bit_rate;
psong->samplerate = sample_rate;
psong->channels = channel_count;
//DEBUG DPRINTF(E_DEBUG,L_SCANNER,"Data length: %d\n", data_length);
sec = data_length / (bit_rate / 8);
ms = ((data_length % (bit_rate / 8)) * 1000) / (bit_rate / 8);
psong->song_length = (sec * 1000) + ms;
//DEBUG DPRINTF(E_DEBUG,L_SCANNER,"Song length: %d\n", psong->song_length);
//DEBUG DPRINTF(E_DEBUG,L_SCANNER,"Bit rate: %d\n", psong->bitrate);
/* Upon further review, WAV files should be little-endian, and DLNA requires the LPCM profile to be big-endian.
asprintf(&(psong->mime), "audio/L16;rate=%d;channels=%d", psong->samplerate, psong->channels);
*/
return 0;
}
static int
_get_wavfileinfo(char *filename, struct song_metadata *psong)
{
psong->lossless = 1;
/* Upon further review, WAV files should be little-endian, and DLNA requires the LPCM profile to be big-endian.
asprintf(&(psong->dlna_pn), "LPCM");
*/
return 0;
}

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