b510e72f946a33e701a626d0a59ca5c2790d1d4d
2 * Copyright (C) 2003-2007 Andre Noll <maan@systemlinux.org>
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
19 /** \file mp3_afh.c para_server's mp3 audio format handler */
22 * This file is based in part on mp3tech.c and mp3tech.h, Copyright (C)
23 * 2000-2001 Cedric Tefft <cedric@earthling.net>, which in turn is based
26 * * MP3Info 0.5 by Ricardo Cerqueira <rmc@rccn.net>
27 * * MP3Stat 0.9 by Ed Sweetman <safemode@voicenet.com> and
28 * Johannes Overmann <overmann@iname.com>
36 /** \cond some defines and structs which are only used in this file */
39 * MIN_CONSEC_GOOD_FRAMES defines how many consecutive valid MP3 frames we need
40 * to see before we decide we are looking at a real MP3 file
42 #define MIN_CONSEC_GOOD_FRAMES 4
43 #define FRAME_HEADER_SIZE 4
44 #define MIN_FRAME_SIZE 21
55 unsigned int copyright
;
56 unsigned int original
;
57 unsigned int emphasis
;
69 struct mp3header header
;
76 static const int frequencies
[3][4] = {
77 {22050,24000,16000,50000}, /* MPEG 2.0 */
78 {44100,48000,32000,50000}, /* MPEG 1.0 */
79 {11025,12000,8000,50000} /* MPEG 2.5 */
82 static const int mp3info_bitrate
[2][3][14] = {
84 {32,48,56,64,80,96,112,128,144,160,176,192,224,256}, /* layer 1 */
85 {8,16,24,32,40,48,56,64,80,96,112,128,144,160}, /* layer 2 */
86 {8,16,24,32,40,48,56,64,80,96,112,128,144,160} /* layer 3 */
90 {32,64,96,128,160,192,224,256,288,320,352,384,416,448}, /* layer 1 */
91 {32,48,56,64,80,96,112,128,160,192,224,256,320,384}, /* layer 2 */
92 {32,40,48,56,64,80,96,112,128,160,192,224,256,320} /* layer 3 */
96 static const int frame_size_index
[] = {24000, 72000, 72000};
97 static const char *mode_text
[] = {"stereo", "joint stereo", "dual channel", "mono", "invalid"};
99 static struct mp3info mp3
;
101 static int header_frequency(struct mp3header
*h
)
103 if (h
->version
> 2 || h
->freq
> 3)
104 return -E_HEADER_FREQ
;
105 return frequencies
[h
->version
][h
->freq
];
108 static const char *header_mode(struct mp3header
*h
)
111 h
->mode
= 4; /* invalid */
112 return mode_text
[h
->mode
];
115 static int header_channels(struct mp3header
*h
)
124 static int header_bitrate(struct mp3header
*h
)
126 if (h
->layer
> 3 || h
->bitrate
> 14)
127 return -E_HEADER_BITRATE
;
128 return mp3info_bitrate
[h
->version
& 1][3 - h
->layer
][h
->bitrate
- 1];
131 static int frame_length(struct mp3header
*header
)
133 int hb
, hf
= header_frequency(header
);
137 hb
= header_bitrate(header
);
140 if (header
->sync
!= 0xFFE || header
->layer
> 3)
142 return frame_size_index
[3 - header
->layer
] *
143 ((header
->version
& 1) + 1) * hb
/ hf
147 static void write_info_str(struct audio_format_info
*afi
)
149 int v
= mp3
.id3_isvalid
;
151 snprintf(afi
->info_string
, MMD_INFO_SIZE
,
152 "audio_file_info1:%lu x %lums, %u kbit/s (%cbr) %i KHz %s\n"
153 "audio_file_info2:%s, by %s\n"
154 "audio_file_info3:A: %s, Y: %s, C: %s\n",
156 tv2ms(&afi
->chunk_tv
),
159 afi
->frequency
/ 1000,
160 header_mode(&mp3
.header
),
161 v
&& *mp3
.id3
.title
? mp3
.id3
.title
: "(title tag not set)",
162 v
&& *mp3
.id3
.artist
? mp3
.id3
.artist
: "(artist tag not set)",
163 v
&& *mp3
.id3
.album
? mp3
.id3
.album
: "(album tag not set)",
164 v
&& *mp3
.id3
.year
? mp3
.id3
.year
: "????",
165 v
&& *mp3
.id3
.comment
? mp3
.id3
.comment
: "(comment tag not set)"
170 * Remove trailing whitespace from the end of a string
172 static char *unpad(char *string
)
174 char *pos
= string
+ strlen(string
) - 1;
175 while (isspace(pos
[0]))
180 static int compare_headers(struct mp3header
*h1
,struct mp3header
*h2
)
182 if ((*(uint
*)h1
) == (*(uint
*)h2
))
184 if ((h1
->version
== h2
->version
) &&
185 (h1
->layer
== h2
->layer
) &&
186 (h1
->crc
== h2
->crc
) &&
187 (h1
->freq
== h2
->freq
) &&
188 (h1
->mode
== h2
->mode
) &&
189 (h1
->copyright
== h2
->copyright
) &&
190 (h1
->original
== h2
->original
) &&
191 (h1
->emphasis
== h2
->emphasis
))
197 * get next MP3 frame header.
199 * On success, the header frame length is returned and the given header
200 * structure that is filled in. A return value of zero means that we did not
201 * retrieve a valid frame header, and a negative return value indicates an
204 static int get_header(unsigned char *map
, off_t numbytes
, off_t
*fpos
,
205 struct mp3header
*header
)
209 if (*fpos
+ FRAME_HEADER_SIZE
> numbytes
) {
210 *fpos
= numbytes
- 1;
214 header
->layer
= (map
[*fpos
+ 1] >> 1) & 3;
215 header
->sync
= (((int)map
[*fpos
]<<4) | ((int)(map
[*fpos
+ 1]&0xE0)>>4));
216 if (map
[*fpos
+ 1] & 0x10)
217 header
->version
= (map
[*fpos
+ 1] >> 3) & 1;
220 if ((header
->sync
!= 0xFFE) || (header
->layer
!= 1)) {
225 header
->crc
= map
[*fpos
+ 1] & 1;
226 header
->bitrate
= (map
[*fpos
+ 2] >> 4) & 0x0F;
227 header
->freq
= (map
[*fpos
+ 2] >> 2) & 0x3;
228 header
->padding
= (map
[*fpos
+ 2] >>1) & 0x1;
229 header
->mode
= (map
[*fpos
+ 3] >> 6) & 0x3;
230 fl
= frame_length(header
);
231 ret
= (fl
>= MIN_FRAME_SIZE
)? fl
: -E_FRAME_LENGTH
;
233 *fpos
+= FRAME_HEADER_SIZE
;
238 * find the next mp3 header
240 * Return the length of the next frame header or zero if the end of the file is
243 static int mp3_seek_next_header(unsigned char *map
, off_t numbytes
, off_t
*fpos
)
245 int k
, l
= 0, first_len
;
246 struct mp3header h
, h2
;
247 long valid_start
= 0;
249 for (; *fpos
< numbytes
; (*fpos
)++) {
250 if (map
[*fpos
] != 0xff)
253 first_len
= get_header(map
, numbytes
, fpos
, &h
);
256 *fpos
+= first_len
- FRAME_HEADER_SIZE
;
257 for (k
= 1; k
< MIN_CONSEC_GOOD_FRAMES
; k
++) {
258 if ((l
= get_header(map
, numbytes
, fpos
, &h2
)) <= 0)
260 if (!compare_headers(&h
, &h2
))
262 *fpos
+= l
- FRAME_HEADER_SIZE
;
264 if (k
== MIN_CONSEC_GOOD_FRAMES
) {
266 memcpy(&(mp3
.header
), &h2
, sizeof(struct mp3header
));
273 static void mp3_get_id3(unsigned char *map
, off_t numbytes
, off_t
*fpos
)
276 mp3
.id3
.title
[0] = '\0';
277 mp3
.id3
.artist
[0] = '\0';
278 mp3
.id3
.album
[0] = '\0';
279 mp3
.id3
.comment
[0] = '\0';
280 mp3
.id3
.year
[0] = '\0';
283 *fpos
= numbytes
- 128;
284 if (strncmp("TAG", map
+ *fpos
, 3)) {
285 PARA_INFO_LOG("%s", "no id3 tag\n");
288 *fpos
= numbytes
- 125;
289 memcpy(mp3
.id3
.title
, map
+ *fpos
, 30);
291 mp3
.id3
.title
[30] = '\0';
292 memcpy(mp3
.id3
.artist
, map
+ *fpos
, 30);
294 mp3
.id3
.artist
[30] = '\0';
295 memcpy(mp3
.id3
.album
, map
+ *fpos
, 30);
297 mp3
.id3
.album
[30] = '\0';
298 memcpy(mp3
.id3
.year
, map
+ *fpos
, 4);
300 mp3
.id3
.year
[4] = '\0';
301 memcpy(mp3
.id3
.comment
, map
+ *fpos
, 30);
302 mp3
.id3
.comment
[30] = '\0';
304 unpad(mp3
.id3
.title
);
305 unpad(mp3
.id3
.artist
);
306 unpad(mp3
.id3
.album
);
308 unpad(mp3
.id3
.comment
);
311 static int find_valid_start(unsigned char *map
, off_t numbytes
, off_t
*fpos
)
315 frame_len
= get_header(map
, numbytes
, fpos
, &mp3
.header
);
319 frame_len
= mp3_seek_next_header(map
, numbytes
, fpos
);
323 *fpos
-= FRAME_HEADER_SIZE
;
325 return -E_FRAME_LENGTH
;
329 static int mp3_read_info(unsigned char *map
, off_t numbytes
,
330 struct audio_format_info
*afi
)
332 long fl_avg
= 0, freq_avg
= 0, br_avg
= 0;
333 int ret
, len
= 0, old_br
= -1;
334 struct timeval total_time
= {0, 0};
335 unsigned chunk_table_size
= 1000; /* gets increased on demand */
338 afi
->chunks_total
= 0;
339 afi
->chunk_table
= para_malloc(chunk_table_size
* sizeof(size_t));
340 mp3_get_id3(map
, numbytes
, &fpos
);
345 struct timeval tmp
, cct
; /* current chunk time */
347 len
= find_valid_start(map
, numbytes
, &fpos
);
350 freq
= header_frequency(&mp3
.header
);
351 br
= header_bitrate(&mp3
.header
);
352 fl
= frame_length(&mp3
.header
);
353 if (freq
< 0 || br
< 0 || fl
< 0)
357 tv_divide(br
* 125, &tmp
, &cct
);
358 tv_add(&cct
, &total_time
, &tmp
);
360 //PARA_DEBUG_LOG("%s: br: %d, freq: %d, fl: %d, cct: %lu\n", __func__, br, freq, fl, cct.tv_usec);
361 if (afi
->chunks_total
>= chunk_table_size
) {
362 chunk_table_size
*= 2;
363 afi
->chunk_table
= para_realloc(afi
->chunk_table
,
364 chunk_table_size
* sizeof(size_t));
366 afi
->chunk_table
[afi
->chunks_total
] = fpos
;
367 // if (afi->chunks_total < 10 || !(afi->chunks_total % 1000))
368 // PARA_INFO_LOG("chunk #%lu: %zd\n", afi->chunks_total,
369 // afi->chunk_table[afi->chunks_total]);
371 if (afi
->chunks_total
== 1) {
378 freq_avg
+= (freq
- freq_avg
) / (afi
->chunks_total
+ 1);
379 fl_avg
+= (fl
- fl_avg
) / (afi
->chunks_total
+ 1);
380 br_avg
+= (br
- br_avg
) / ((long)afi
->chunks_total
+ 1);
386 if (!afi
->chunks_total
|| !freq_avg
|| !br_avg
)
388 afi
->chunk_table
[afi
->chunks_total
] = numbytes
- 1;
389 afi
->bitrate
= br_avg
;
390 afi
->frequency
= freq_avg
;
391 afi
->channels
= header_channels(&mp3
.header
);
392 afi
->seconds_total
= (tv2ms(&total_time
) + 500) / 1000;
393 tv_divide(afi
->chunks_total
, &total_time
, &afi
->chunk_tv
);
394 PARA_DEBUG_LOG("%lu chunks, each %lums\n", afi
->chunks_total
,
395 tv2ms(&afi
->chunk_tv
));
396 tv_scale(3, &afi
->chunk_tv
, &afi
->eof_tv
);
397 PARA_DEBUG_LOG("eof timeout: %lu\n", tv2ms(&afi
->eof_tv
));
400 PARA_ERROR_LOG("%s\n", PARA_STRERROR(-ret
));
401 free(afi
->chunk_table
);
406 * Read mp3 information from audio file
408 static int mp3_get_file_info(char *map
, off_t numbytes
,
409 struct audio_format_info
*afi
)
413 ret
= mp3_read_info((unsigned char *)map
, numbytes
, afi
);
417 if (afi
->seconds_total
< 2 || !afi
->chunks_total
)
422 static const char* mp3_suffixes
[] = {"mp3", NULL
};
425 * the init function of the mp3 audio format handler
427 * \param afh pointer to the struct to initialize
429 void mp3_init(struct audio_format_handler
*afh
)
431 afh
->get_file_info
= mp3_get_file_info
;
432 afh
->suffixes
= mp3_suffixes
;