afh_common.c

   1 /*
   2  * Copyright (C) 1997-2007 Andre Noll <maan@systemlinux.org>
   3  *
   4  * Licensed under the GPL v2. For licencing details see COPYING.
   5  */
   6 /* \file afh_common.c: Common audio format handler functions. */
   7
   8 #include <sys/mman.h> /* mmap */
   9 #include <sys/time.h> /* gettimeofday */
  10 #include <sys/types.h>
  11 #include <dirent.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
  28 /**
  29  * The list of supported  audio formats.
  30  *
  31  * We always define the full array of audio formats even if some audio formats
  32  * were not compiled in. This is because for each audio file the number of its
  33  * audio format is stored in the database. We don't want that numbers to become
  34  * stale just because the user installed a new version of paraslash that
  35  * supports a different set of audio formats.
  36  *
  37  * It can still be easily detected whether an audio format is compiled in by
  38  * checking if the init function pointer is not \p NULL.
  39  */
  40 static struct audio_format_handler afl[] = {
  41         {
  42                 .name = "mp3",
  43                 .init = mp3_init,
  44         },
  45         {
  46                 .name = "ogg",
  47 #ifdef HAVE_OGGVORBIS
  48                 .init = ogg_init,
  49 #endif
  50         },
  51         {
  52                 .name = "aac",
  53 #ifdef HAVE_FAAD
  54                 .init = aac_afh_init,
  55 #endif
  56         },
  57         {
  58                 .name = NULL,
  59         }
  60 };
  61
  62 static inline int next_audio_format(int format)
  63 {
  64         for (;;) {
  65                 if (!afl[format].name)
  66                         return format;
  67                 format++;
  68                 if (afl[format].init)
  69                         return format;
  70         }
  71
  72 }
  73
  74 /** Iterate over each supported audio format. */
  75 #define FOR_EACH_AUDIO_FORMAT(i) for (i = 0; afl[i].name; i = next_audio_format(i))
  76
  77 void afh_init(void)
  78 {
  79         int i;
  80
  81         PARA_DEBUG_LOG("supported audio formats: %s\n",
  82                 SUPPORTED_AUDIO_FORMATS);
  83         FOR_EACH_AUDIO_FORMAT(i) {
  84                 PARA_NOTICE_LOG("initializing %s handler\n",
  85                         audio_format_name(i));
  86                 afl[i].init(&afl[i]);
  87         }
  88 }
  89
  90
  91 /**
  92  * guess the audio format judging from filename
  93  *
  94  * \param name the filename
  95  *
  96  * \return This function returns -1 if it has no idea what kind of audio
  97  * file this might be. Otherwise the (non-negative) number of the audio format
  98  * is returned.
  99  */
 100 int guess_audio_format(const char *name)
 101 {
 102         int i,j, len = strlen(name);
 103
 104         FOR_EACH_AUDIO_FORMAT(i) {
 105                 for (j = 0; afl[i].suffixes[j]; j++) {
 106                         const char *p = afl[i].suffixes[j];
 107                         int plen = strlen(p);
 108                         if (len < plen + 1)
 109                                 continue;
 110                         if (name[len - plen - 1] != '.')
 111                                 continue;
 112                         if (strcasecmp(name + len - plen, p))
 113                                 continue;
 114 //                      PARA_DEBUG_LOG("might be %s\n", audio_format_name(i));
 115                         return i;
 116                 }
 117         }
 118         return -E_BAD_AUDIO_FILE_SUFFIX;
 119 }
 120
 121 /**
 122  * Call get_file_info() to obtain an afhi structure.
 123  *
 124  * \param path The full path of the audio file.
 125  * \param data Pointer to the contents of the (mapped) file.
 126  * \param size The file size in bytes.
 127  * \param afhi Result pointer.
 128  *
 129  * \return The number of the audio format on success, \p -E_AUDIO_FORMAT if no
 130  * compiled in audio format handler is able to handler the file.
 131  *
 132  * This function tries to find an audio format handler that can interpret the
 133  * file given by \a data and \a size.
 134  *
 135  * It first tries to determine the audio format from the filename given by \a
 136  * path. If this doesn't work, all other audio format handlers are tried until
 137  * one is found that can handle the file.
 138  */
 139 int compute_afhi(const char *path, char *data, size_t size,
 140                 struct audio_format_info *afhi)
 141 {
 142         int ret, i, format = guess_audio_format(path);
 143
 144         if (format >= 0) {
 145                 ret = afl[format].get_file_info(data, size, afhi);
 146                 if (ret >= 0)
 147                         return format;
 148         }
 149         FOR_EACH_AUDIO_FORMAT(i) {
 150                 if (i == format) /* we already tried this one to no avail */
 151                         continue;
 152                 ret = afl[i].get_file_info(data, size, afhi);
 153                 if (ret >= 0)
 154                         return i;
 155                 PARA_WARNING_LOG("%s\n", PARA_STRERROR(-ret));
 156         }
 157         return -E_AUDIO_FORMAT;
 158 }
 159
 160 /**
 161  * Get the name of the given audio format.
 162  *
 163  * \param i The audio format number.
 164  *
 165  * This returns a pointer to statically allocated memory so it
 166  * must not be freed by the caller.
 167  */
 168 const char *audio_format_name(int i)
 169 {
 170         //PARA_NOTICE_LOG("array size: %u¸ requested: %d\n", ARRAY_SIZE(afl), i);
 171         assert(i < 0 || i < ARRAY_SIZE(afl) - 1);
 172         return i >= 0?  afl[i].name : "(none)";
 173 }
 174