afh_common.c

   1 /*
   2  * Copyright (C) 1997-2013 Andre Noll <maan@systemlinux.org>
   3  *
   4  * Licensed under the GPL v2. For licencing details see COPYING.
   5  */
   6
   7 /** \file afh_common.c Common audio format handler functions. */
   8
   9 #include <sys/mman.h> /* mmap */
  10 #include <sys/types.h>
  11 #include <regex.h>
  12
  13 #include "para.h"
  14 #include "error.h"
  15 #include "string.h"
  16 #include "afh.h"
  17
  18 /* The mp3 audio format handler does not need any libs. */
  19 void mp3_init(struct audio_format_handler *);
  20
  21 #ifdef HAVE_OGGVORBIS
  22         void ogg_init(struct audio_format_handler *);
  23 #endif
  24 #ifdef HAVE_FAAD
  25         void aac_afh_init(struct audio_format_handler *);
  26 #endif
  27 #ifdef HAVE_SPEEX
  28         void spx_afh_init(struct audio_format_handler *);
  29 #endif
  30 #ifdef HAVE_FLAC
  31         void flac_afh_init(struct audio_format_handler *);
  32 #endif
  33
  34 #ifdef HAVE_OPUS
  35         void opus_afh_init(struct audio_format_handler *);
  36 #endif
  37
  38 void wma_afh_init(struct audio_format_handler *);
  39
  40 /** The list of all status items */
  41 const char *status_item_list[] = {STATUS_ITEM_ARRAY};
  42
  43 /**
  44  * The list of supported audio formats.
  45  *
  46  * We always define the full array of audio formats even if some audio formats
  47  * were not compiled in. This is because for each audio file the number of its
  48  * audio format is stored in the database. We don't want that numbers to become
  49  * stale just because the user installed a new version of paraslash that
  50  * supports a different set of audio formats.
  51  *
  52  * It can still be easily detected whether an audio format is compiled in by
  53  * checking if the init function pointer is not \p NULL.
  54  */
  55 static struct audio_format_handler afl[] = {
  56         {
  57                 .name = "mp3",
  58                 .init = mp3_init,
  59         },
  60         {
  61                 .name = "ogg",
  62 #ifdef HAVE_OGGVORBIS
  63                 .init = ogg_init,
  64 #endif
  65         },
  66         {
  67                 .name = "aac",
  68 #ifdef HAVE_FAAD
  69                 .init = aac_afh_init,
  70 #endif
  71         },
  72         {
  73                 .name = "wma",
  74                 .init = wma_afh_init,
  75         },
  76         {
  77                 .name = "spx",
  78 #ifdef HAVE_SPEEX
  79                 .init = spx_afh_init,
  80 #endif
  81         },
  82         {
  83                 .name = "flac",
  84 #ifdef HAVE_FLAC
  85                 .init = flac_afh_init,
  86 #endif
  87         },
  88         {
  89                 .name = "opus",
  90 #ifdef HAVE_OPUS
  91                 .init = opus_afh_init,
  92 #endif
  93         },
  94         {
  95                 .name = NULL,
  96         }
  97 };
  98
  99 static inline int next_audio_format(int format)
 100 {
 101         for (;;) {
 102                 if (!afl[format].name)
 103                         return format;
 104                 format++;
 105                 if (afl[format].init)
 106                         return format;
 107         }
 108
 109 }
 110
 111 /** Iterate over each supported audio format. */
 112 #define FOR_EACH_AUDIO_FORMAT(i) for (i = 0; afl[i].name; i = next_audio_format(i))
 113
 114 /**
 115  * Call the init function of each supported audio format handler.
 116  */
 117 void afh_init(void)
 118 {
 119         int i;
 120
 121         PARA_INFO_LOG("supported audio formats: %s\n", AUDIO_FORMAT_HANDLERS);
 122         FOR_EACH_AUDIO_FORMAT(i) {
 123                 PARA_NOTICE_LOG("initializing %s handler\n",
 124                         audio_format_name(i));
 125                 afl[i].init(&afl[i]);
 126         }
 127 }
 128
 129 /**
 130  * Guess the audio format judging from filename.
 131  *
 132  * \param name The filename.
 133  *
 134  * \return This function returns \p -E_AUDIO_FORMAT if it has no idea what kind
 135  * of audio file this might be. Otherwise the (non-negative) number of the
 136  * audio format is returned.
 137  */
 138 int guess_audio_format(const char *name)
 139 {
 140         int i,j, len = strlen(name);
 141
 142         FOR_EACH_AUDIO_FORMAT(i) {
 143                 for (j = 0; afl[i].suffixes[j]; j++) {
 144                         const char *p = afl[i].suffixes[j];
 145                         int plen = strlen(p);
 146                         if (len < plen + 1)
 147                                 continue;
 148                         if (name[len - plen - 1] != '.')
 149                                 continue;
 150                         if (strcasecmp(name + len - plen, p))
 151                                 continue;
 152 //                      PARA_DEBUG_LOG("might be %s\n", audio_format_name(i));
 153                         return i;
 154                 }
 155         }
 156         return -E_AUDIO_FORMAT;
 157 }
 158
 159 /**
 160  * Call get_file_info() to obtain an afhi structure.
 161  *
 162  * \param path The full path of the audio file.
 163  * \param data Pointer to the contents of the (mapped) file.
 164  * \param size The file size in bytes.
 165  * \param fd The open file descriptor.
 166  * \param afhi Result pointer.
 167  *
 168  * \return The number of the audio format on success, \p -E_AUDIO_FORMAT if no
 169  * compiled in audio format handler is able to handler the file.
 170  *
 171  * This function tries to find an audio format handler that can interpret the
 172  * file given by \a data and \a size.
 173  *
 174  * It first tries to determine the audio format from the filename given by \a
 175  * path. If this doesn't work, all other audio format handlers are tried until
 176  * one is found that can handle the file.
 177  */
 178 int compute_afhi(const char *path, char *data, size_t size, int fd,
 179                 struct afh_info *afhi)
 180 {
 181         int ret, i, format;
 182
 183         afhi->header_len = 0;
 184         afhi->techinfo = NULL;
 185         afhi->tags.artist = NULL;
 186         afhi->tags.title = NULL;
 187         afhi->tags.year = NULL;
 188         afhi->tags.album = NULL;
 189         afhi->tags.comment = NULL;
 190         format = guess_audio_format(path);
 191
 192         if (format >= 0) {
 193                 ret = afl[format].get_file_info(data, size, fd, afhi);
 194                 if (ret >= 0) {
 195                         ret = format;
 196                         goto success;
 197                 }
 198         }
 199         FOR_EACH_AUDIO_FORMAT(i) {
 200                 if (i == format) /* we already tried this one to no avail */
 201                         continue;
 202                 ret = afl[i].get_file_info(data, size, fd, afhi);
 203                 if (ret >= 0) {
 204                         ret = i;
 205                         goto success;
 206                 }
 207                 PARA_WARNING_LOG("%s\n", para_strerror(-ret));
 208         }
 209         return -E_AUDIO_FORMAT;
 210 success:
 211         if (!afhi->techinfo)
 212                 afhi->techinfo = para_strdup(NULL);
 213         if (!afhi->tags.artist)
 214                 afhi->tags.artist = para_strdup(NULL);
 215         if (!afhi->tags.title)
 216                 afhi->tags.title = para_strdup(NULL);
 217         if (!afhi->tags.year)
 218                 afhi->tags.year = para_strdup(NULL);
 219         if (!afhi->tags.album)
 220                 afhi->tags.album = para_strdup(NULL);
 221         if (!afhi->tags.comment)
 222                 afhi->tags.comment = para_strdup(NULL);
 223         PARA_DEBUG_LOG("techinfo: %s\n", afhi->techinfo);
 224         PARA_DEBUG_LOG("artist: %s\n", afhi->tags.artist);
 225         PARA_DEBUG_LOG("title: %s\n", afhi->tags.title);
 226         PARA_DEBUG_LOG("year: %s\n", afhi->tags.year);
 227         PARA_DEBUG_LOG("album: %s\n", afhi->tags.album);
 228         PARA_DEBUG_LOG("comment: %s\n", afhi->tags.comment);
 229         return ret;
 230 }
 231
 232 /**
 233  * Deallocate contents of a filled-in ahi structure
 234  *
 235  * \param afhi The structure to clear.
 236  *
 237  * The given pointer is kept, everything else is freed.
 238  */
 239 void clear_afhi(struct afh_info *afhi)
 240 {
 241         if (!afhi)
 242                 return;
 243         free(afhi->chunk_table);
 244         free(afhi->techinfo);
 245         free(afhi->tags.artist);
 246         free(afhi->tags.title);
 247         free(afhi->tags.year);
 248         free(afhi->tags.album);
 249         free(afhi->tags.comment);
 250 }
 251
 252 /**
 253  * Get the name of the given audio format.
 254  *
 255  * \param i The audio format number.
 256  *
 257  * \return This returns a pointer to statically allocated memory so it
 258  * must not be freed by the caller.
 259  */
 260 const char *audio_format_name(int i)
 261 {
 262         if (i < 0 || i >= ARRAY_SIZE(afl) - 1)
 263                 return "???";
 264         return afl[i].name;
 265 }
 266
 267 /**
 268  * Get one chunk of audio data.
 269  *
 270  * \param chunk_num The number of the chunk to get.
 271  * \param afhi Describes the audio file.
 272  * \param map The memory mapped audio file.
 273  * \param buf Result pointer.
 274  * \param len The length of the chunk in bytes.
 275  *
 276  * Upon return, \a buf will point so memory inside \a map. The returned buffer
 277  * must therefore not be freed by the caller.
 278  */
 279 void afh_get_chunk(long unsigned chunk_num, struct afh_info *afhi,
 280                 void *map, const char **buf, size_t *len)
 281 {
 282         size_t pos = afhi->chunk_table[chunk_num];
 283         *buf = map + pos;
 284         *len = afhi->chunk_table[chunk_num + 1] - pos;
 285 }
 286
 287 /**
 288  * Get the header of an audio file.
 289  *
 290  * \param afhi The audio file handler data describing the file.
 291  * \param audio_format_id Determines the audio format handler.
 292  * \param map The data of the audio file.
 293  * \param mapsize The amount of bytes of the mmapped audio file.
 294  * \param buf The length of the header is stored here.
 295  * \param len Points to a buffer containing the header on return.
 296  *
 297  * This function sets \a buf to \p NULL and \a len to zero if \a map or \a
 298  * afhi is \p NULL, or if the current audio format does not need special
 299  * header treatment.
 300  *
 301  * Otherwise, it is checked whether the audio format handler given by
 302  * \a audio_format_id defines a ->get_header() method. If it does, this
 303  * method is called to obtain the header. If ->get_header() is \p NULL,
 304  * a reference to the first chunk of the audio file is returned.
 305  *
 306  * Once the header is no longer needed, the caller must call \ref
 307  * afh_free_header() to free the resources allocated by this function.
 308  */
 309 void afh_get_header(struct afh_info *afhi, uint8_t audio_format_id,
 310                 void *map, size_t mapsize, char **buf, size_t *len)
 311 {
 312         struct audio_format_handler *afh = afl + audio_format_id;
 313
 314         if (!map || !afhi || !afhi->header_len) {
 315                 *buf = NULL;
 316                 *len = 0;
 317                 return;
 318         }
 319         if (!afh->get_header) {
 320                 *len = afhi->header_len;
 321                 *buf = map;
 322                 return;
 323         }
 324         afh->get_header(map, mapsize, buf, len);
 325 }
 326
 327 /**
 328  * Deallocate any resources obtained from afh_get_header().
 329  *
 330  * \param header_buf Pointer obtained via afh_get_header().
 331  * \param audio_format_id Determines the audio format handler.
 332  */
 333 void afh_free_header(char *header_buf, uint8_t audio_format_id)
 334 {
 335         struct audio_format_handler *afh = afl + audio_format_id;
 336
 337         if (afh->get_header)
 338                 free(header_buf);
 339 }
 340
 341 /**
 342  * Pretty-print the contents of a struct afh_info into a buffer.
 343  *
 344  * \param audio_format_num The audio format number.
 345  * \param afhi Pointer to the structure that contains the information.
 346  * \param result Pretty-printed ahfi is here after the call.
 347  *
 348  * The \a result buffer is dynamically allocated and should be freed by the
 349  * caller.
 350  *
 351  * \return The number of bytes. This function never fails.
 352  */
 353 unsigned afh_get_afhi_txt(int audio_format_num, struct afh_info *afhi, char **result)
 354 {
 355         return xasprintf(result, "%s: %dkbit/s\n" /* bitrate */
 356                 "%s: %s\n" /* format */
 357                 "%s: %dHz\n" /* frequency */
 358                 "%s: %d\n" /* channels */
 359                 "%s: %lu\n" /* seconds total */
 360                 "%s: %lu: %lu\n" /* chunk time */
 361                 "%s: %lu\n" /* num chunks */
 362                 "%s: %s\n" /* techinfo */
 363                 "%s: %s\n" /* artist */
 364                 "%s: %s\n" /* title */
 365                 "%s: %s\n" /* year */
 366                 "%s: %s\n" /* album */
 367                 "%s: %s\n", /* comment */
 368                 status_item_list[SI_BITRATE], afhi->bitrate,
 369                 status_item_list[SI_FORMAT], audio_format_name(audio_format_num),
 370                 status_item_list[SI_FREQUENCY], afhi->frequency,
 371                 status_item_list[SI_CHANNELS], afhi->channels,
 372                 status_item_list[SI_SECONDS_TOTAL], afhi->seconds_total,
 373                 status_item_list[SI_CHUNK_TIME], (long unsigned)afhi->chunk_tv.tv_sec,
 374                         (long unsigned)afhi->chunk_tv.tv_usec,
 375                 status_item_list[SI_NUM_CHUNKS], afhi->chunks_total,
 376                 status_item_list[SI_TECHINFO], afhi->techinfo? afhi->techinfo : "",
 377                 status_item_list[SI_ARTIST], afhi->tags.artist? afhi->tags.artist : "",
 378                 status_item_list[SI_TITLE], afhi->tags.title? afhi->tags.title : "",
 379                 status_item_list[SI_YEAR], afhi->tags.year? afhi->tags.year : "",
 380                 status_item_list[SI_ALBUM], afhi->tags.album? afhi->tags.album : "",
 381                 status_item_list[SI_COMMENT], afhi->tags.comment? afhi->tags.comment : ""
 382         );
 383 }