1 /* Copyright (C) 2003 Andre Noll <maan@tuebingen.mpg.de>, see file COPYING. */
3 /** \file mp3_afh.c para_server's mp3 audio format handler */
6 * This file is based in part on mp3tech.c and mp3tech.h, Copyright (C)
7 * 2000-2001 Cedric Tefft <cedric@earthling.net>, which in turn is based
10 * * MP3Info 0.5 by Ricardo Cerqueira <rmc@rccn.net>
11 * * MP3Stat 0.9 by Ed Sweetman <safemode@voicenet.com> and
12 * Johannes Overmann <overmann@iname.com>
24 * MIN_CONSEC_GOOD_FRAMES defines how many consecutive valid MP3 frames we need
25 * to see before we decide we are looking at a real MP3 file
27 #define MIN_CONSEC_GOOD_FRAMES 4
28 #define FRAME_HEADER_SIZE 4
29 #define MIN_FRAME_SIZE 21
40 unsigned int copyright
;
41 unsigned int original
;
42 unsigned int emphasis
;
45 static const int frequencies
[3][4] = {
46 {22050,24000,16000,50000}, /* MPEG 2.0 */
47 {44100,48000,32000,50000}, /* MPEG 1.0 */
48 {11025,12000,8000,50000} /* MPEG 2.5 */
51 static const int mp3info_bitrate
[2][3][14] = {
53 {32,48,56,64,80,96,112,128,144,160,176,192,224,256}, /* layer 1 */
54 {8,16,24,32,40,48,56,64,80,96,112,128,144,160}, /* layer 2 */
55 {8,16,24,32,40,48,56,64,80,96,112,128,144,160} /* layer 3 */
59 {32,64,96,128,160,192,224,256,288,320,352,384,416,448}, /* layer 1 */
60 {32,48,56,64,80,96,112,128,160,192,224,256,320,384}, /* layer 2 */
61 {32,40,48,56,64,80,96,112,128,160,192,224,256,320} /* layer 3 */
65 static const int frame_size_index
[] = {24000, 72000, 72000};
70 static char *get_utf8(id3_ucs4_t
const *string
)
74 return (char *)id3_ucs4_utf8duplicate(string
);
77 static char *get_stringlist(union id3_field
*field
)
79 unsigned int k
, nstrings
= id3_field_getnstrings(field
);
82 for (k
= 0; k
< nstrings
; k
++) {
83 char *tmp
= (char *)get_utf8(id3_field_getstrings(field
, k
));
86 result
= make_message("%s %s", tmp2
, tmp
);
95 static char *get_string(union id3_field
*field
)
97 id3_ucs4_t
const *string
= id3_field_getfullstring(field
);
99 return get_utf8(string
);
102 #define FOR_EACH_FIELD(f, j, fr) for (j = 0; j < (fr)->nfields && \
103 (f = id3_frame_field((fr), j)); j++)
105 static char *get_strings(struct id3_frame
*fr
)
108 union id3_field
*field
;
110 FOR_EACH_FIELD(field
, j
, fr
) {
111 enum id3_field_type type
= id3_field_type(field
);
113 if (type
== ID3_FIELD_TYPE_STRINGLIST
)
114 return get_stringlist(field
);
115 if (type
== ID3_FIELD_TYPE_STRINGFULL
)
116 return get_string(field
);
121 /* this only sets values which are undefined so far */
122 static void parse_frames(struct id3_tag
*id3_t
, struct taginfo
*tags
)
126 for (i
= 0; i
< id3_t
->nframes
; i
++) {
127 struct id3_frame
*fr
= id3_t
->frames
[i
];
128 if (!strcmp(fr
->id
, ID3_FRAME_TITLE
)) {
130 tags
->title
= get_strings(fr
);
133 if (!strcmp(fr
->id
, ID3_FRAME_ARTIST
)) {
135 tags
->artist
= get_strings(fr
);
138 if (!strcmp(fr
->id
, ID3_FRAME_ALBUM
)) {
140 tags
->album
= get_strings(fr
);
143 if (!strcmp(fr
->id
, ID3_FRAME_YEAR
)) {
145 tags
->year
= get_strings(fr
);
148 if (!strcmp(fr
->id
, ID3_FRAME_COMMENT
)) {
150 tags
->comment
= get_strings(fr
);
156 static int mp3_get_id3(unsigned char *map
, size_t numbytes
, __a_unused
int fd
,
157 struct taginfo
*tags
)
160 struct id3_tag
*id3_t
;
162 /* id3v2 tags are usually located at the beginning. */
163 id3_t
= id3_tag_parse(map
, numbytes
);
165 parse_frames(id3_t
, tags
);
167 id3_tag_delete(id3_t
);
169 /* Also look for an id3v1 tag at the end of the file. */
170 if (numbytes
>= 128) {
171 id3_t
= id3_tag_parse(map
+ numbytes
- 128, 128);
173 parse_frames(id3_t
, tags
);
175 id3_tag_delete(id3_t
);
181 /* These helpers are not mentioned in the libid3tag header file. */
182 void id3_field_init(union id3_field
*field
, enum id3_field_type type
);
183 void id3_field_finish(union id3_field
*field
);
186 * Frames of type ID3_FRAME_COMMENT contain three fields of type language,
187 * string, and fullstring. The third field contains the actual comment.
189 static int set_comment_fields(struct id3_frame
*fr
, id3_ucs4_t
*ucs4_val
)
192 union id3_field
*field
;
194 field
= id3_frame_field(fr
, 1);
195 id3_field_init(field
, ID3_FIELD_TYPE_LANGUAGE
);
197 field
= id3_frame_field(fr
, 2);
198 id3_field_init(field
, ID3_FIELD_TYPE_STRING
);
200 field
= id3_frame_field(fr
, 3);
201 id3_field_init(field
, ID3_FIELD_TYPE_STRINGFULL
);
202 ret
= id3_field_setfullstring(field
, ucs4_val
);
204 return -E_ID3_SETSTRING
;
209 * UCS-4 stands for Universal Character Set where each character uses exactly
210 * 32 bits. It is also known as UTF-32, see ISO 10646.
212 * We have to use UCS-4 as an intermediate representation because the functions
213 * of libid3tag which set the tag content expect an array of UCS-4 characters.
214 * Fortunately, libid3tag contains conversion functions from and to UTF-8.
216 static int replace_tag(char const *id
, const char *val
, struct id3_tag
*id3_t
,
220 struct id3_frame
*fr
;
221 union id3_field
*field
;
222 id3_ucs4_t
*ucs4_val
;
224 /* First, detach all frames that match the given id. */
225 while ((fr
= id3_tag_findframe(id3_t
, id
, 0))) {
226 PARA_INFO_LOG("deleting %s frame\n", id
);
227 ret
= id3_tag_detachframe(id3_t
, fr
);
229 return -E_ID3_DETACH
;
230 id3_frame_delete(fr
);
234 fr
= id3_frame_new(id
);
235 PARA_DEBUG_LOG("frame desc: %s, %u fields\n", fr
->description
, fr
->nfields
);
237 /* Frame 0 contains the encoding. We always use UTF-8. */
238 field
= id3_frame_field(fr
, 0);
239 id3_field_init(field
, ID3_FIELD_TYPE_TEXTENCODING
);
240 ret
= id3_field_settextencoding(field
, ID3_FIELD_TEXTENCODING_UTF_8
);
242 return -E_ID3_SETENCODING
;
243 /* create UCS-4 representation */
244 ucs4_val
= id3_utf8_ucs4duplicate((const id3_utf8_t
*)val
);
246 if (strcmp(id
, ID3_FRAME_COMMENT
) == 0)
247 ret
= set_comment_fields(fr
, ucs4_val
);
249 /* Non-comment frames contain the value in field 1. */
250 field
= id3_frame_field(fr
, 1);
251 if (options
& ID3_TAG_OPTION_ID3V1
) {
252 id3_ucs4_t
*ptr
[] = {ucs4_val
, NULL
};
253 id3_field_init(field
, ID3_FIELD_TYPE_STRINGLIST
);
254 ret
= id3_field_setstrings(field
, 1, ptr
);
256 id3_field_init(field
, ID3_FIELD_TYPE_STRINGFULL
);
257 ret
= id3_field_setfullstring(field
, ucs4_val
);
262 return -E_ID3_SETSTRING
;
264 PARA_INFO_LOG("attaching %s frame, value: %s\n", id
, val
);
265 ret
= id3_tag_attachframe(id3_t
, fr
);
267 return -E_ID3_ATTACH
;
271 static int replace_tags(struct id3_tag
*id3_t
, struct taginfo
*tags
)
273 int ret
, options
= id3_tag_options(id3_t
, 0, 0);
275 ret
= replace_tag(ID3_FRAME_ARTIST
, tags
->artist
, id3_t
, options
);
278 ret
= replace_tag(ID3_FRAME_TITLE
, tags
->title
, id3_t
, options
);
281 ret
= replace_tag(ID3_FRAME_ALBUM
, tags
->album
, id3_t
, options
);
284 ret
= replace_tag(ID3_FRAME_YEAR
, tags
->year
, id3_t
, options
);
287 ret
= replace_tag(ID3_FRAME_COMMENT
, tags
->comment
, id3_t
, options
);
293 /* id3_tag_delete() does not seem to work due to refcount issues. */
294 static void free_tag(struct id3_tag
*id3_t
)
300 for (i
= 0; i
< id3_t
->nframes
; i
++) {
301 struct id3_frame
*fr
= id3_t
->frames
[i
];
302 for (j
= 0; j
< fr
->nfields
; j
++) {
303 union id3_field
*field
= &fr
->fields
[j
];
304 id3_field_finish(field
);
312 static int mp3_rewrite_tags(const char *map
, size_t mapsize
,
313 struct taginfo
*tags
, int fd
, __a_unused
const char *filename
)
316 id3_length_t old_v2size
, new_v2size
;
317 id3_byte_t v1_buffer
[128], *v2_buffer
;
319 struct id3_tag
*v1_tag
= NULL
, *v2_tag
= NULL
;
321 if (mapsize
>= 128) {
322 v1_tag
= id3_tag_parse((const id3_byte_t
*)map
+ mapsize
- 128,
325 PARA_NOTICE_LOG("replacing id3v1 tag\n");
326 ret
= replace_tags(v1_tag
, tags
);
329 id3_tag_render(v1_tag
, v1_buffer
);
333 v2_tag
= id3_tag_parse((const id3_byte_t
*)map
, mapsize
);
335 PARA_NOTICE_LOG("replacing id3v2 tag\n");
336 old_v2size
= v2_tag
->paddedsize
;
338 PARA_NOTICE_LOG("adding id3v2 tag\n");
339 v2_tag
= id3_tag_new();
343 * Turn off all options to avoid creating an extended header. id321
344 * does not understand it.
346 id3_tag_options(v2_tag
, ~0U, 0);
347 ret
= replace_tags(v2_tag
, tags
);
350 new_v2size
= id3_tag_render(v2_tag
, NULL
);
351 v2_buffer
= para_malloc(new_v2size
);
352 id3_tag_render(v2_tag
, v2_buffer
);
353 PARA_INFO_LOG("writing v2 tag (%lu bytes)\n", new_v2size
);
354 ret
= write_all(fd
, (char *)v2_buffer
, new_v2size
);
358 data_sz
= mapsize
- old_v2size
;
359 if (v1_tag
&& data_sz
>= 128)
361 PARA_INFO_LOG("writing data part (%zu bytes)\n", data_sz
);
362 ret
= write_all(fd
, map
+ old_v2size
, data_sz
);
366 PARA_INFO_LOG("writing v1 tag\n");
367 ret
= write_all(fd
, (char *)v1_buffer
, 128);
375 #else /* HAVE_ID3TAG */
378 * Remove trailing whitespace from the end of a string
380 static char *unpad(char *string
)
382 char *pos
= string
+ strlen(string
) - 1;
383 while (para_isspace(pos
[0]))
388 static int mp3_get_id3(unsigned char *map
, size_t numbytes
, __a_unused
int fd
,
389 struct taginfo
*tags
)
391 char title
[31], artist
[31], album
[31], year
[5], comment
[31];
394 if (numbytes
< 128 || strncmp("TAG", (char *)map
+ numbytes
- 128, 3)) {
395 PARA_DEBUG_LOG("no id3 v1 tag\n");
398 fpos
= numbytes
- 125;
399 memcpy(title
, map
+ fpos
, 30);
402 memcpy(artist
, map
+ fpos
, 30);
405 memcpy(album
, map
+ fpos
, 30);
408 memcpy(year
, map
+ fpos
, 4);
411 memcpy(comment
, map
+ fpos
, 30);
418 tags
->artist
= para_strdup(artist
);
419 tags
->title
= para_strdup(title
);
420 tags
->year
= para_strdup(year
);
421 tags
->album
= para_strdup(album
);
422 tags
->comment
= para_strdup(comment
);
425 #endif /* HAVE_ID3TAG */
427 static int header_frequency(struct mp3header
*h
)
429 if (h
->version
> 2 || h
->freq
> 3)
430 return -E_HEADER_FREQ
;
431 return frequencies
[h
->version
][h
->freq
];
434 static const char *header_mode(const struct mp3header
*h
)
436 const char * const mode_text
[] = {"stereo", "joint stereo",
437 "dual channel", "mono"};
439 if (h
->mode
>= ARRAY_SIZE(mode_text
))
441 return mode_text
[h
->mode
];
444 static int header_channels(struct mp3header
*h
)
453 static int header_bitrate(struct mp3header
*h
)
455 if (!h
->layer
|| h
->layer
> 3 || h
->bitrate
> 14 || !h
->bitrate
)
456 return -E_HEADER_BITRATE
;
457 return mp3info_bitrate
[h
->version
& 1][3 - h
->layer
][h
->bitrate
- 1];
460 static int frame_length(struct mp3header
*header
)
462 int hb
, hf
= header_frequency(header
);
466 hb
= header_bitrate(header
);
469 if (header
->sync
!= 0xFFE || header
->layer
> 3)
471 return frame_size_index
[3 - header
->layer
] *
472 ((header
->version
& 1) + 1) * hb
/ hf
476 static int compare_headers(struct mp3header
*h1
,struct mp3header
*h2
)
478 if ((*(unsigned int*)h1
) == (*(unsigned int*)h2
))
480 if ((h1
->version
== h2
->version
) &&
481 (h1
->layer
== h2
->layer
) &&
482 (h1
->crc
== h2
->crc
) &&
483 (h1
->freq
== h2
->freq
) &&
484 (h1
->mode
== h2
->mode
) &&
485 (h1
->copyright
== h2
->copyright
) &&
486 (h1
->original
== h2
->original
) &&
487 (h1
->emphasis
== h2
->emphasis
))
493 * get next MP3 frame header.
495 * On success, the header frame length is returned and the given header
496 * structure that is filled in. A return value of zero means that we did not
497 * retrieve a valid frame header, and a negative return value indicates an
500 static int get_header(unsigned char *map
, size_t numbytes
, off_t
*fpos
,
501 struct mp3header
*header
)
505 if (*fpos
+ FRAME_HEADER_SIZE
> numbytes
) {
506 *fpos
= numbytes
- 1;
510 header
->layer
= (map
[*fpos
+ 1] >> 1) & 3;
511 header
->sync
= (((int)map
[*fpos
]<<4) | ((int)(map
[*fpos
+ 1]&0xE0)>>4));
512 if (map
[*fpos
+ 1] & 0x10)
513 header
->version
= (map
[*fpos
+ 1] >> 3) & 1;
516 if ((header
->sync
!= 0xFFE) || (header
->layer
!= 1)) {
521 header
->crc
= map
[*fpos
+ 1] & 1;
522 header
->bitrate
= (map
[*fpos
+ 2] >> 4) & 0x0F;
523 header
->freq
= (map
[*fpos
+ 2] >> 2) & 0x3;
524 header
->padding
= (map
[*fpos
+ 2] >>1) & 0x1;
525 header
->mode
= (map
[*fpos
+ 3] >> 6) & 0x3;
526 fl
= frame_length(header
);
527 ret
= (fl
>= MIN_FRAME_SIZE
)? fl
: -E_FRAME_LENGTH
;
529 *fpos
+= FRAME_HEADER_SIZE
;
534 * find the next mp3 header
536 * Return the length of the next frame header or zero if the end of the file is
539 static int mp3_seek_next_header(unsigned char *map
, size_t numbytes
, off_t
*fpos
,
540 struct mp3header
*result
)
542 int k
, l
= 0, first_len
;
543 struct mp3header h
, h2
;
544 long valid_start
= 0;
546 for (; *fpos
< numbytes
; (*fpos
)++) {
547 if (map
[*fpos
] != 0xff)
550 first_len
= get_header(map
, numbytes
, fpos
, &h
);
553 *fpos
+= first_len
- FRAME_HEADER_SIZE
;
554 for (k
= 1; k
< MIN_CONSEC_GOOD_FRAMES
; k
++) {
555 if ((l
= get_header(map
, numbytes
, fpos
, &h2
)) <= 0)
557 if (!compare_headers(&h
, &h2
))
559 *fpos
+= l
- FRAME_HEADER_SIZE
;
561 if (k
== MIN_CONSEC_GOOD_FRAMES
) {
570 static int find_valid_start(unsigned char *map
, size_t numbytes
, off_t
*fpos
,
571 struct mp3header
*header
)
575 frame_len
= get_header(map
, numbytes
, fpos
, header
);
579 frame_len
= mp3_seek_next_header(map
, numbytes
, fpos
, header
);
583 *fpos
-= FRAME_HEADER_SIZE
;
585 return -E_FRAME_LENGTH
;
589 static int mp3_read_info(unsigned char *map
, size_t numbytes
, int fd
,
590 struct afh_info
*afhi
)
592 uint64_t freq_sum
= 0, br_sum
= 0;
593 int fl
= 0, ret
, len
= 0, old_br
= -1, vbr
= 0;
594 struct timeval total_time
= {0, 0};
595 unsigned chunk_table_size
= 1000; /* gets increased on demand */
597 struct mp3header header
;
598 const char *tag_versions
[] = {"no", "id3v1", "id3v2", "id3v1+id3v2"};
600 afhi
->chunks_total
= 0;
601 afhi
->chunk_table
= para_malloc(chunk_table_size
* sizeof(uint32_t));
604 struct timeval tmp
, cct
; /* current chunk time */
606 len
= find_valid_start(map
, numbytes
, &fpos
, &header
);
610 if (!afhi
->chunks_total
)
612 end
= afhi
->chunk_table
[afhi
->chunks_total
- 1] + fl
;
613 afhi
->chunk_table
[afhi
->chunks_total
]
614 = PARA_MIN(end
, numbytes
);
617 ret
= header_frequency(&header
);
621 ret
= header_bitrate(&header
);
625 ret
= frame_length(&header
);
629 tmp
.tv_sec
= fl
- header
.padding
;
631 tv_divide(br
* 125, &tmp
, &cct
);
632 tv_add(&cct
, &total_time
, &tmp
);
634 if (afhi
->chunks_total
>= chunk_table_size
) {
635 chunk_table_size
*= 2;
636 afhi
->chunk_table
= para_realloc(afhi
->chunk_table
,
637 chunk_table_size
* sizeof(uint32_t));
639 afhi
->chunk_table
[afhi
->chunks_total
] = fpos
;
640 afhi
->chunks_total
++;
643 if (afhi
->chunks_total
!= 1 && old_br
!= br
)
648 if (!freq_sum
|| !br_sum
)
650 afhi
->bitrate
= br_sum
/ afhi
->chunks_total
;
651 afhi
->frequency
= freq_sum
/ afhi
->chunks_total
;
652 afhi
->channels
= header_channels(&header
);
653 afhi
->seconds_total
= (tv2ms(&total_time
) + 500) / 1000;
654 tv_divide(afhi
->chunks_total
, &total_time
, &afhi
->chunk_tv
);
655 PARA_DEBUG_LOG("%" PRIu32
" chunks, each %lums\n", afhi
->chunks_total
,
656 tv2ms(&afhi
->chunk_tv
));
657 set_max_chunk_size(afhi
);
658 ret
= mp3_get_id3(map
, numbytes
, fd
, &afhi
->tags
);
659 afhi
->techinfo
= make_message("%cbr, %s, %s tags", vbr
? 'v' : 'c',
660 header_mode(&header
), tag_versions
[ret
]);
663 free(afhi
->chunk_table
);
668 * Read mp3 information from audio file
670 static int mp3_get_file_info(char *map
, size_t numbytes
, int fd
,
671 struct afh_info
*afhi
)
675 ret
= mp3_read_info((unsigned char *)map
, numbytes
, fd
, afhi
);
678 if (afhi
->chunks_total
== 0)
683 static const char * const mp3_suffixes
[] = {"mp3", NULL
};
686 * The mp3 audio format handler.
688 * It does not depend on any libraries and is hence always compiled in.
690 const struct audio_format_handler mp3_afh
= {
691 .get_file_info
= mp3_get_file_info
,
692 .suffixes
= mp3_suffixes
,
693 #ifdef HAVE_LIBID3TAG
694 .rewrite_tags
= mp3_rewrite_tags
,
695 #endif /* HAVE_LIBID3TAG */