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source: titan/minidlna-1.0.22/tagutils/tagutils-wav.c @ 13567

Last change on this file since 13567 was 13567, checked in by obi, 11 years ago
[titan] add minidlna-1.0.22 first step
File size: 7.2 KB

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1	//=========================================================================
2	// FILENAME : tagutils-wav.c
3	// DESCRIPTION : WAV metadata reader
4	//=========================================================================
5	// Copyright (c) 2009 NETGEAR, Inc. All Rights Reserved.
6	// based on software from Ron Pedde's FireFly Media Server project
7	//=========================================================================
8
9	/*
10	* This program is free software; you can redistribute it and/or modify
11	* it under the terms of the GNU General Public License as published by
12	* the Free Software Foundation; either version 2 of the License, or
13	* (at your option) any later version.
14	*
15	* This program is distributed in the hope that it will be useful,
16	* but WITHOUT ANY WARRANTY; without even the implied warranty of
17	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18	* GNU General Public License for more details.
19	*
20	* You should have received a copy of the GNU General Public License
21	* along with this program. If not, see <http://www.gnu.org/licenses/>.
22	*/
23
24	#define GET_WAV_INT32(p) ((((uint32_t)((p)[3])) << 24) \| \
25	(((uint32_t)((p)[2])) << 16) \| \
26	(((uint32_t)((p)[1])) << 8) \| \
27	(((uint32_t)((p)[0]))))
28
29	#define GET_WAV_INT16(p) ((((uint32_t)((p)[1])) << 8) \| \
30	(((uint32_t)((p)[0]))))
31
32	static int
33	_get_wavtags(char filename, struct song_metadata psong)
34	{
35	int fd;
36	uint32_t len;
37	unsigned char hdr[12];
38	unsigned char fmt[16];
39	//uint32_t chunk_data_length;
40	uint32_t format_data_length = 0;
41	uint32_t compression_code = 0;
42	uint32_t channel_count = 0;
43	uint32_t sample_rate = 0;
44	uint32_t sample_bit_length = 0;
45	uint32_t bit_rate;
46	uint32_t data_length = 0;
47	uint32_t sec, ms;
48
49	uint32_t current_offset;
50	uint32_t block_len;
51
52	//DEBUG DPRINTF(E_DEBUG,L_SCANNER,"Getting WAV file info\n");
53
54	if(!(fd = open(filename, O_RDONLY)))
55	{
56	DPRINTF(E_WARN, L_SCANNER, "Could not create file handle\n");
57	return -1;
58	}
59
60	len = 12;
61	if(!(len = read(fd, hdr, len)) \|\| (len != 12))
62	{
63	DPRINTF(E_WARN, L_SCANNER, "Could not read wav header from %s\n", filename);
64	close(fd);
65	return -1;
66	}
67
68	/* I've found some wav files that have INFO tags
69	* in them... */
70	if(strncmp((char*)hdr + 0, "RIFF", 4) \|\|
71	strncmp((char*)hdr + 8, "WAVE", 4))
72	{
73	DPRINTF(E_WARN, L_SCANNER, "Invalid wav header in %s\n", filename);
74	close(fd);
75	return -1;
76	}
77
78	//chunk_data_length = GET_WAV_INT32(hdr + 4);
79
80	/* now, walk through the chunks */
81	current_offset = 12;
82	while(current_offset < psong->file_size)
83	{
84	len = 8;
85	if(!(len = read(fd, hdr, len)) \|\| (len != 8))
86	{
87	close(fd);
88	DPRINTF(E_WARN, L_SCANNER, "Error reading block: %s\n", filename);
89	return -1;
90	}
91
92	current_offset += 8;
93	block_len = GET_WAV_INT32(hdr + 4);
94
95	//DEBUG DPRINTF(E_DEBUG,L_SCANNER,"Read block %02x%02x%02x%02x (%c%c%c%c) of "
96	// "size 0x%08x\n",hdr[0],hdr[1],hdr[2],hdr[3],
97	// isprint(hdr[0]) ? hdr[0] : '?',
98	// isprint(hdr[1]) ? hdr[1] : '?',
99	// isprint(hdr[2]) ? hdr[2] : '?',
100	// isprint(hdr[3]) ? hdr[3] : '?',
101	// block_len);
102
103	if(block_len < 0)
104	{
105	close(fd);
106	DPRINTF(E_WARN, L_SCANNER, "Bad block len: %s\n", filename);
107	return -1;
108	}
109
110	if(strncmp((char*)&hdr, "fmt ", 4) == 0)
111	{
112	//DEBUG DPRINTF(E_DEBUG,L_SCANNER,"Found 'fmt ' header\n");
113	len = 16;
114	if(!read(fd, fmt, len) \|\| (len != 16))
115	{
116	close(fd);
117	DPRINTF(E_WARN, L_SCANNER, "Bad .wav file: can't read fmt: %s\n",
118	filename);
119	return -1;
120	}
121
122	format_data_length = block_len;
123	compression_code = GET_WAV_INT16(fmt);
124	channel_count = GET_WAV_INT16(fmt + 2);
125	sample_rate = GET_WAV_INT32(fmt + 4);
126	sample_bit_length = GET_WAV_INT16(fmt + 14);
127	//DEBUG DPRINTF(E_DEBUG,L_SCANNER,"Compression code: %d\n",compression_code);
128	//DEBUG DPRINTF(E_DEBUG,L_SCANNER,"Channel count: %d\n",channel_count);
129	//DEBUG DPRINTF(E_DEBUG,L_SCANNER,"Sample Rate: %d\n",sample_rate);
130	//DEBUG DPRINTF(E_DEBUG,L_SCANNER,"Sample bit length %d\n",sample_bit_length);
131
132	}
133	else if(strncmp((char*)&hdr, "data", 4) == 0)
134	{
135	//DEBUG DPRINTF(E_DEBUG,L_SCANNER,"Found 'data' header\n");
136	data_length = block_len;
137	goto next_block;
138	}
139	else if(strncmp((char*)&hdr, "LIST", 4) == 0)
140	{
141	char *tags;
142	char *p;
143	int off;
144	int taglen;
145	char **m;
146
147	len = GET_WAV_INT32(hdr + 4);
148	if(len > 65536)
149	goto next_block;
150
151	tags = malloc(len);
152	if(!tags)
153	goto next_block;
154
155	if(read(fd, tags, len) < len \|\|
156	strncmp(tags, "INFO", 4) != 0)
157	{
158	free(tags);
159	goto next_block;
160	}
161
162	off = 4;
163	p = tags + off;
164	while(off < len - 8)
165	{
166	taglen = GET_WAV_INT32(p + 4);
167
168	//DEBUG DPRINTF(E_DEBUG, L_SCANNER, "%.s: %.s\n", 4, p, taglen, p + 8);
169	m = NULL;
170	if (taglen > 2048) {
171	DPRINTF(E_WARN, L_SCANNER, "Ignoring long tag [%.*s] in %s\n",
172	4, p+8, filename);
173	}
174	else if(strncmp(p, "INAM", 4) == 0)
175	m = &(psong->title);
176	else if(strncmp(p, "IALB", 4) == 0 \|\|
177	strncmp(p, "IPRD", 4) == 0)
178	m = &(psong->album);
179	else if(strncmp(p, "IGRE", 4) == 0 \|\|
180	strncmp(p, "IGNR", 4) == 0)
181	m = &(psong->genre);
182	else if(strncmp(p, "ICMT", 4) == 0)
183	m = &(psong->comment);
184	else if(strncmp(p, "IART", 4) == 0)
185	m = &(psong->contributor[ROLE_TRACKARTIST]);
186	else if(strncmp(p, "IAAR", 4) == 0)
187	m = &(psong->contributor[ROLE_ALBUMARTIST]);
188	else if(strncmp(p, "ICOM", 4) == 0 \|\|
189	strncmp(p, "IMUS", 4) == 0)
190	m = &(psong->contributor[ROLE_COMPOSER]);
191	else if(strncasecmp(p, "ITRK", 4) == 0)
192	psong->track = atoi(p + 8);
193	else if(strncmp(p, "ICRD", 4) == 0 \|\|
194	strncmp(p, "IYER", 4) == 0)
195	psong->year = atoi(p + 8);
196	if(m)
197	{
198	*m = malloc(taglen + 1);
199	strncpy(*m, p + 8, taglen);
200	(*m)[taglen] = '\0';
201	}
202
203	p += taglen + 8;
204	off += taglen + 8;
205	}
206	free(tags);
207	}
208	next_block:
209	lseek(fd, current_offset + block_len, SEEK_SET);
210	current_offset += block_len;
211	}
212	close(fd);
213
214	if(((format_data_length != 16) && (format_data_length != 18)) \|\|
215	(compression_code != 1) \|\|
216	(channel_count < 1))
217	{
218	DPRINTF(E_WARN, L_SCANNER, "Invalid wav header in %s\n", filename);
219	return -1;
220	}
221
222	if( !data_length )
223	data_length = psong->file_size - 44;
224
225	bit_rate = sample_rate * channel_count * ((sample_bit_length + 7) / 8) * 8;
226	psong->bitrate = bit_rate;
227	psong->samplerate = sample_rate;
228	psong->channels = channel_count;
229	//DEBUG DPRINTF(E_DEBUG,L_SCANNER,"Data length: %d\n", data_length);
230	sec = data_length / (bit_rate / 8);
231	ms = ((data_length % (bit_rate / 8)) * 1000) / (bit_rate / 8);
232	psong->song_length = (sec * 1000) + ms;
233	//DEBUG DPRINTF(E_DEBUG,L_SCANNER,"Song length: %d\n", psong->song_length);
234	//DEBUG DPRINTF(E_DEBUG,L_SCANNER,"Bit rate: %d\n", psong->bitrate);
235
236	/* Upon further review, WAV files should be little-endian, and DLNA requires the LPCM profile to be big-endian.
237	asprintf(&(psong->mime), "audio/L16;rate=%d;channels=%d", psong->samplerate, psong->channels);
238	*/
239
240	return 0;
241	}
242
243	static int
244	_get_wavfileinfo(char filename, struct song_metadata psong)
245	{
246	psong->lossless = 1;
247	/* Upon further review, WAV files should be little-endian, and DLNA requires the LPCM profile to be big-endian.
248	asprintf(&(psong->dlna_pn), "LPCM");
249	*/
250
251	return 0;
252	}

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