mdw@git.distorted.org.uk Git - disorder/blob - server/decode.c

   1 /*
   2  * This file is part of DisOrder
   3  * Copyright (C) 2007-2010 Richard Kettlewell
   4  *
   5  * This program is free software: you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation, either version 3 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  17  */
  18 /** @file server/decode.c
  19  * @brief General-purpose decoder for use by speaker process
  20  */
  21 #include "decode.h"
  22
  23 #include <mad.h>
  24 #include <vorbis/vorbisfile.h>
  25
  26 #include <FLAC/stream_decoder.h>
  27
  28 #include "wav.h"
  29
  30
  31 /** @brief Encoding lookup table type */
  32 struct decoder {
  33   /** @brief Glob pattern matching file */
  34   const char *pattern;
  35   /** @brief Decoder function */
  36   void (*decode)(void);
  37 };
  38
  39 FILE *outputfp;
  40 const char *path;
  41 char input_buffer[INPUT_BUFFER_SIZE];
  42 int input_count;
  43
  44 /** @brief Write a block header
  45  * @param rate Sample rate in Hz
  46  * @param channels Channel count (currently only 1 or 2 supported)
  47  * @param bits Bits per sample (must be a multiple of 8, no more than 64)
  48  * @param nbytes Total number of data bytes
  49  * @param endian @ref ENDIAN_BIG or @ref ENDIAN_LITTLE
  50  *
  51  * Checks that the sample format is a supported one (so other calls do not have
  52  * to) and calls disorder_fatal() on error.
  53  */
  54 void output_header(int rate,
  55                    int channels,
  56                    int bits,
  57                    int nbytes,
  58                    int endian) {
  59   struct stream_header header;
  60
  61   if(bits <= 0 || bits % 8 || bits > 64)
  62     disorder_fatal(0, "decoding %s: unsupported sample size %d bits",
  63                    path, bits);
  64   if(channels <= 0 || channels > 2)
  65     disorder_fatal(0, "decoding %s: unsupported channel count %d",
  66                    path, channels);
  67   if(rate <= 0)
  68     disorder_fatal(0, "decoding %s: nonsensical sample rate %dHz", path, rate);
  69   header.rate = rate;
  70   header.bits = bits;
  71   header.channels = channels;
  72   header.endian = endian;
  73   header.nbytes = nbytes;
  74   if(fwrite(&header, sizeof header, 1, outputfp) < 1)
  75     disorder_fatal(errno, "decoding %s: writing format header", path);
  76 }
  77
  78 /** @brief Lookup table of decoders */
  79 static const struct decoder decoders[] = {
  80   { "*.mp3", decode_mp3 },
  81   { "*.MP3", decode_mp3 },
  82   { "*.ogg", decode_ogg },
  83   { "*.OGG", decode_ogg },
  84   { "*.flac", decode_flac },
  85   { "*.FLAC", decode_flac },
  86   { "*.wav", decode_wav },
  87   { "*.WAV", decode_wav },
  88   { 0, 0 }
  89 };
  90
  91 static const struct option options[] = {
  92   { "help", no_argument, 0, 'h' },
  93   { "version", no_argument, 0, 'V' },
  94   { 0, 0, 0, 0 }
  95 };
  96
  97 /* Display usage message and terminate. */
  98 static void attribute((noreturn)) help(void) {
  99   xprintf("Usage:\n"
 100           "  disorder-decode [OPTIONS] PATH\n"
 101           "Options:\n"
 102           "  --help, -h              Display usage message\n"
 103           "  --version, -V           Display version number\n"
 104           "\n"
 105           "Audio decoder for DisOrder.  Only intended to be used by speaker\n"
 106           "process, not for normal users.\n");
 107   xfclose(stdout);
 108   exit(0);
 109 }
 110
 111 int main(int argc, char **argv) {
 112   int n;
 113   const char *e;
 114
 115   set_progname(argv);
 116   if(!setlocale(LC_CTYPE, "")) disorder_fatal(errno, "calling setlocale");
 117   while((n = getopt_long(argc, argv, "hV", options, 0)) >= 0) {
 118     switch(n) {
 119     case 'h': help();
 120     case 'V': version("disorder-decode");
 121     default: disorder_fatal(0, "invalid option");
 122     }
 123   }
 124   if(optind >= argc)
 125     disorder_fatal(0, "missing filename");
 126   if(optind + 1 < argc)
 127     disorder_fatal(0, "excess arguments");
 128   if((e = getenv("DISORDER_RAW_FD"))) {
 129     if(!(outputfp = fdopen(atoi(e), "wb")))
 130       disorder_fatal(errno, "fdopen");
 131   } else
 132     outputfp = stdout;
 133   path = argv[optind];
 134   for(n = 0;
 135       decoders[n].pattern
 136         && fnmatch(decoders[n].pattern, path, 0) != 0;
 137       ++n)
 138     ;
 139   if(!decoders[n].pattern)
 140     disorder_fatal(0, "cannot determine file type for %s", path);
 141   decoders[n].decode();
 142   xfclose(outputfp);
 143   return 0;
 144 }
 145
 146 /*
 147 Local Variables:
 148 c-basic-offset:2
 149 comment-column:40
 150 fill-column:79
 151 indent-tabs-mode:nil
 152 End:
 153 */