2 * Copyright (C) 2003-2012 Andre Noll <maan@systemlinux.org>
4 * Licensed under the GPL v2. For licencing details see COPYING.
7 /** \file mp3_afh.c para_server's mp3 audio format handler */
10 * This file is based in part on mp3tech.c and mp3tech.h, Copyright (C)
11 * 2000-2001 Cedric Tefft <cedric@earthling.net>, which in turn is based
14 * * MP3Info 0.5 by Ricardo Cerqueira <rmc@rccn.net>
15 * * MP3Stat 0.9 by Ed Sweetman <safemode@voicenet.com> and
16 * Johannes Overmann <overmann@iname.com>
27 * MIN_CONSEC_GOOD_FRAMES defines how many consecutive valid MP3 frames we need
28 * to see before we decide we are looking at a real MP3 file
30 #define MIN_CONSEC_GOOD_FRAMES 4
31 #define FRAME_HEADER_SIZE 4
32 #define MIN_FRAME_SIZE 21
43 unsigned int copyright
;
44 unsigned int original
;
45 unsigned int emphasis
;
48 static const int frequencies
[3][4] = {
49 {22050,24000,16000,50000}, /* MPEG 2.0 */
50 {44100,48000,32000,50000}, /* MPEG 1.0 */
51 {11025,12000,8000,50000} /* MPEG 2.5 */
54 static const int mp3info_bitrate
[2][3][14] = {
56 {32,48,56,64,80,96,112,128,144,160,176,192,224,256}, /* layer 1 */
57 {8,16,24,32,40,48,56,64,80,96,112,128,144,160}, /* layer 2 */
58 {8,16,24,32,40,48,56,64,80,96,112,128,144,160} /* layer 3 */
62 {32,64,96,128,160,192,224,256,288,320,352,384,416,448}, /* layer 1 */
63 {32,48,56,64,80,96,112,128,160,192,224,256,320,384}, /* layer 2 */
64 {32,40,48,56,64,80,96,112,128,160,192,224,256,320} /* layer 3 */
68 static const int frame_size_index
[] = {24000, 72000, 72000};
69 static const char *mode_text
[] = {"stereo", "joint stereo", "dual channel", "mono", "invalid"};
75 static char *get_latin1(id3_ucs4_t
const *string
)
79 return (char *)id3_ucs4_latin1duplicate(string
);
82 static char *get_stringlist(union id3_field
*field
)
84 unsigned int k
, nstrings
= id3_field_getnstrings(field
);
87 for (k
= 0; k
< nstrings
; k
++) {
88 char *tmp
= (char *)get_latin1(id3_field_getstrings(field
, k
));
91 result
= make_message("%s %s", tmp2
, tmp
);
100 static char *get_string(union id3_field
*field
)
102 id3_ucs4_t
const *string
= id3_field_getfullstring(field
);
104 return get_latin1(string
);
107 #define FOR_EACH_FIELD(f, j, fr) for (j = 0; j < (fr)->nfields && \
108 (f = id3_frame_field((fr), j)); j++)
110 static char *get_strings(struct id3_frame
*fr
)
113 union id3_field
*field
;
115 FOR_EACH_FIELD(field
, j
, fr
) {
116 enum id3_field_type type
= id3_field_type(field
);
118 if (type
== ID3_FIELD_TYPE_STRINGLIST
)
119 return get_stringlist(field
);
120 if (type
== ID3_FIELD_TYPE_STRINGFULL
)
121 return get_string(field
);
126 static void mp3_get_id3(__a_unused
unsigned char *map
,
127 __a_unused
size_t numbytes
, int fd
, struct taginfo
*tags
)
130 struct id3_tag
*id3_t
;
131 struct id3_file
*id3_f
= id3_file_fdopen(fd
, ID3_FILE_MODE_READONLY
);
135 id3_t
= id3_file_tag(id3_f
);
137 id3_file_close(id3_f
);
140 for (i
= 0; i
< id3_t
->nframes
; i
++) {
141 struct id3_frame
*fr
= id3_t
->frames
[i
];
142 if (!strcmp(fr
->id
, "TIT2")) {
144 tags
->title
= get_strings(fr
);
147 if (!strcmp(fr
->id
, "TPE1")) {
149 tags
->artist
= get_strings(fr
);
152 if (!strcmp(fr
->id
, "TALB")) {
154 tags
->album
= get_strings(fr
);
157 if (!strcmp(fr
->id
, "TDRC")) {
159 tags
->year
= get_strings(fr
);
162 if (!strcmp(fr
->id
, "COMM")) {
164 tags
->comment
= get_strings(fr
);
168 id3_file_close(id3_f
);
171 #else /* HAVE_LIBID3TAG */
174 * Remove trailing whitespace from the end of a string
176 static char *unpad(char *string
)
178 char *pos
= string
+ strlen(string
) - 1;
179 while (para_isspace(pos
[0]))
184 static void mp3_get_id3(unsigned char *map
, size_t numbytes
, __a_unused
int fd
,
185 struct taginfo
*tags
)
187 char title
[31], artist
[31], album
[31], year
[5], comment
[31];
190 if (numbytes
< 128 || strncmp("TAG", (char *)map
+ numbytes
- 128, 3)) {
191 PARA_DEBUG_LOG("no id3 v1 tag\n");
194 fpos
= numbytes
- 125;
195 memcpy(title
, map
+ fpos
, 30);
198 memcpy(artist
, map
+ fpos
, 30);
201 memcpy(album
, map
+ fpos
, 30);
204 memcpy(year
, map
+ fpos
, 4);
207 memcpy(comment
, map
+ fpos
, 30);
214 tags
->artist
= para_strdup(artist
);
215 tags
->title
= para_strdup(title
);
216 tags
->year
= para_strdup(year
);
217 tags
->album
= para_strdup(album
);
218 tags
->comment
= para_strdup(comment
);
220 #endif /* HAVE_LIBID3TAG */
222 static int header_frequency(struct mp3header
*h
)
224 if (h
->version
> 2 || h
->freq
> 3)
225 return -E_HEADER_FREQ
;
226 return frequencies
[h
->version
][h
->freq
];
229 static const char *header_mode(struct mp3header
*h
)
232 h
->mode
= 4; /* invalid */
233 return mode_text
[h
->mode
];
236 static int header_channels(struct mp3header
*h
)
245 static int header_bitrate(struct mp3header
*h
)
247 if (!h
->layer
|| h
->layer
> 3 || h
->bitrate
> 14 || !h
->bitrate
)
248 return -E_HEADER_BITRATE
;
249 return mp3info_bitrate
[h
->version
& 1][3 - h
->layer
][h
->bitrate
- 1];
252 static int frame_length(struct mp3header
*header
)
254 int hb
, hf
= header_frequency(header
);
258 hb
= header_bitrate(header
);
261 if (header
->sync
!= 0xFFE || header
->layer
> 3)
263 return frame_size_index
[3 - header
->layer
] *
264 ((header
->version
& 1) + 1) * hb
/ hf
268 static int compare_headers(struct mp3header
*h1
,struct mp3header
*h2
)
270 if ((*(unsigned int*)h1
) == (*(unsigned int*)h2
))
272 if ((h1
->version
== h2
->version
) &&
273 (h1
->layer
== h2
->layer
) &&
274 (h1
->crc
== h2
->crc
) &&
275 (h1
->freq
== h2
->freq
) &&
276 (h1
->mode
== h2
->mode
) &&
277 (h1
->copyright
== h2
->copyright
) &&
278 (h1
->original
== h2
->original
) &&
279 (h1
->emphasis
== h2
->emphasis
))
285 * get next MP3 frame header.
287 * On success, the header frame length is returned and the given header
288 * structure that is filled in. A return value of zero means that we did not
289 * retrieve a valid frame header, and a negative return value indicates an
292 static int get_header(unsigned char *map
, size_t numbytes
, off_t
*fpos
,
293 struct mp3header
*header
)
297 if (*fpos
+ FRAME_HEADER_SIZE
> numbytes
) {
298 *fpos
= numbytes
- 1;
302 header
->layer
= (map
[*fpos
+ 1] >> 1) & 3;
303 header
->sync
= (((int)map
[*fpos
]<<4) | ((int)(map
[*fpos
+ 1]&0xE0)>>4));
304 if (map
[*fpos
+ 1] & 0x10)
305 header
->version
= (map
[*fpos
+ 1] >> 3) & 1;
308 if ((header
->sync
!= 0xFFE) || (header
->layer
!= 1)) {
313 header
->crc
= map
[*fpos
+ 1] & 1;
314 header
->bitrate
= (map
[*fpos
+ 2] >> 4) & 0x0F;
315 header
->freq
= (map
[*fpos
+ 2] >> 2) & 0x3;
316 header
->padding
= (map
[*fpos
+ 2] >>1) & 0x1;
317 header
->mode
= (map
[*fpos
+ 3] >> 6) & 0x3;
318 fl
= frame_length(header
);
319 ret
= (fl
>= MIN_FRAME_SIZE
)? fl
: -E_FRAME_LENGTH
;
321 *fpos
+= FRAME_HEADER_SIZE
;
326 * find the next mp3 header
328 * Return the length of the next frame header or zero if the end of the file is
331 static int mp3_seek_next_header(unsigned char *map
, size_t numbytes
, off_t
*fpos
,
332 struct mp3header
*result
)
334 int k
, l
= 0, first_len
;
335 struct mp3header h
, h2
;
336 long valid_start
= 0;
338 for (; *fpos
< numbytes
; (*fpos
)++) {
339 if (map
[*fpos
] != 0xff)
342 first_len
= get_header(map
, numbytes
, fpos
, &h
);
345 *fpos
+= first_len
- FRAME_HEADER_SIZE
;
346 for (k
= 1; k
< MIN_CONSEC_GOOD_FRAMES
; k
++) {
347 if ((l
= get_header(map
, numbytes
, fpos
, &h2
)) <= 0)
349 if (!compare_headers(&h
, &h2
))
351 *fpos
+= l
- FRAME_HEADER_SIZE
;
353 if (k
== MIN_CONSEC_GOOD_FRAMES
) {
362 static int find_valid_start(unsigned char *map
, size_t numbytes
, off_t
*fpos
,
363 struct mp3header
*header
)
367 frame_len
= get_header(map
, numbytes
, fpos
, header
);
371 frame_len
= mp3_seek_next_header(map
, numbytes
, fpos
, header
);
375 *fpos
-= FRAME_HEADER_SIZE
;
377 return -E_FRAME_LENGTH
;
381 static int mp3_read_info(unsigned char *map
, size_t numbytes
, int fd
,
382 struct afh_info
*afhi
)
384 uint64_t freq_sum
= 0, br_sum
= 0;
385 int fl
= 0, ret
, len
= 0, old_br
= -1, vbr
= 0;
386 struct timeval total_time
= {0, 0};
387 unsigned chunk_table_size
= 1000; /* gets increased on demand */
389 struct mp3header header
;
391 afhi
->chunks_total
= 0;
392 afhi
->chunk_table
= para_malloc(chunk_table_size
* sizeof(uint32_t));
395 struct timeval tmp
, cct
; /* current chunk time */
397 len
= find_valid_start(map
, numbytes
, &fpos
, &header
);
401 if (!afhi
->chunks_total
)
403 end
= afhi
->chunk_table
[afhi
->chunks_total
- 1] + fl
;
404 afhi
->chunk_table
[afhi
->chunks_total
]
405 = PARA_MIN(end
, numbytes
);
408 ret
= header_frequency(&header
);
412 ret
= header_bitrate(&header
);
416 ret
= frame_length(&header
);
420 tmp
.tv_sec
= fl
- header
.padding
;
422 tv_divide(br
* 125, &tmp
, &cct
);
423 tv_add(&cct
, &total_time
, &tmp
);
425 if (afhi
->chunks_total
>= chunk_table_size
) {
426 chunk_table_size
*= 2;
427 afhi
->chunk_table
= para_realloc(afhi
->chunk_table
,
428 chunk_table_size
* sizeof(uint32_t));
430 afhi
->chunk_table
[afhi
->chunks_total
] = fpos
;
431 afhi
->chunks_total
++;
434 if (afhi
->chunks_total
!= 1 && old_br
!= br
)
439 if (!freq_sum
|| !br_sum
)
441 afhi
->bitrate
= br_sum
/ afhi
->chunks_total
;
442 afhi
->frequency
= freq_sum
/ afhi
->chunks_total
;
443 afhi
->channels
= header_channels(&header
);
444 afhi
->seconds_total
= (tv2ms(&total_time
) + 500) / 1000;
445 tv_divide(afhi
->chunks_total
, &total_time
, &afhi
->chunk_tv
);
446 PARA_DEBUG_LOG("%lu chunks, each %lums\n", afhi
->chunks_total
,
447 tv2ms(&afhi
->chunk_tv
));
448 afhi
->techinfo
= make_message("%cbr, %s", vbr
? 'v' : 'c',
449 header_mode(&header
));
450 mp3_get_id3(map
, numbytes
, fd
, &afhi
->tags
);
453 PARA_ERROR_LOG("%s\n", para_strerror(-ret
));
454 free(afhi
->chunk_table
);
459 * Read mp3 information from audio file
461 static int mp3_get_file_info(char *map
, size_t numbytes
, int fd
,
462 struct afh_info
*afhi
)
466 ret
= mp3_read_info((unsigned char *)map
, numbytes
, fd
, afhi
);
469 if (afhi
->seconds_total
< 2 || !afhi
->chunks_total
)
474 static const char* mp3_suffixes
[] = {"mp3", NULL
};
477 * the init function of the mp3 audio format handler
479 * \param afh pointer to the struct to initialize
481 void mp3_init(struct audio_format_handler
*afh
)
483 afh
->get_file_info
= mp3_get_file_info
;
484 afh
->suffixes
= mp3_suffixes
;