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