src/newgrf_sound.cpp

   1 /* $Id: newgrf_sound.cpp 24900 2013-01-08 22:46:42Z planetmaker $ */
   2
   3 /*
   4  * This file is part of OpenTTD.
   5  * OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
   6  * OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
   7  * See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
   8  */
   9
  10 /** @file newgrf_sound.cpp Handling NewGRF provided sounds. */
  11
  12 #include "stdafx.h"
  13 #include "engine_base.h"
  14 #include "newgrf.h"
  15 #include "newgrf_engine.h"
  16 #include "newgrf_sound.h"
  17 #include "vehicle_base.h"
  18 #include "sound_func.h"
  19 #include "fileio_func.h"
  20 #include "debug.h"
  21 #include "settings_type.h"
  22
  23 #include "safeguards.h"
  24
  25 static SmallVector<SoundEntry, 8> _sounds;
  26
  27
  28 /**
  29  * Allocate sound slots.
  30  * @param num Number of slots to allocate.
  31  * @return First allocated slot.
  32  */
  33 SoundEntry *AllocateSound(uint num)
  34 {
  35         SoundEntry *sound = _sounds.Append(num);
  36         MemSetT(sound, 0, num);
  37         return sound;
  38 }
  39
  40
  41 void InitializeSoundPool()
  42 {
  43         _sounds.Clear();
  44
  45         /* Copy original sound data to the pool */
  46         SndCopyToPool();
  47 }
  48
  49
  50 SoundEntry *GetSound(SoundID index)
  51 {
  52         if (index >= _sounds.Length()) return NULL;
  53         return &_sounds[index];
  54 }
  55
  56
  57 uint GetNumSounds()
  58 {
  59         return _sounds.Length();
  60 }
  61
  62
  63 /**
  64  * Extract meta data from a NewGRF sound.
  65  * @param sound Sound to load.
  66  * @return True if a valid sound was loaded.
  67  */
  68 bool LoadNewGRFSound(SoundEntry *sound)
  69 {
  70         if (sound->file_offset == SIZE_MAX || sound->file_slot == 0) return false;
  71
  72         FioSeekToFile(sound->file_slot, sound->file_offset);
  73
  74         /* Skip ID for container version >= 2 as we only look at the first
  75          * entry and ignore any further entries with the same ID. */
  76         if (sound->grf_container_ver >= 2) FioReadDword();
  77
  78         /* Format: <num> <FF> <FF> <name_len> <name> '\0' <data> */
  79
  80         uint32 num = sound->grf_container_ver >= 2 ? FioReadDword() : FioReadWord();
  81         if (FioReadByte() != 0xFF) return false;
  82         if (FioReadByte() != 0xFF) return false;
  83
  84         uint8 name_len = FioReadByte();
  85         char *name = AllocaM(char, name_len + 1);
  86         FioReadBlock(name, name_len + 1);
  87
  88         /* Test string termination */
  89         if (name[name_len] != 0) {
  90                 DEBUG(grf, 2, "LoadNewGRFSound [%s]: Name not properly terminated", FioGetFilename(sound->file_slot));
  91                 return false;
  92         }
  93
  94         DEBUG(grf, 2, "LoadNewGRFSound [%s]: Sound name '%s'...", FioGetFilename(sound->file_slot), name);
  95
  96         if (FioReadDword() != BSWAP32('RIFF')) {
  97                 DEBUG(grf, 1, "LoadNewGRFSound [%s]: Missing RIFF header", FioGetFilename(sound->file_slot));
  98                 return false;
  99         }
 100
 101         uint32 total_size = FioReadDword();
 102         uint header_size = 11;
 103         if (sound->grf_container_ver >= 2) header_size++; // The first FF in the sprite is only counted for container version >= 2.
 104         if (total_size + name_len + header_size > num) {
 105                 DEBUG(grf, 1, "LoadNewGRFSound [%s]: RIFF was truncated", FioGetFilename(sound->file_slot));
 106                 return false;
 107         }
 108
 109         if (FioReadDword() != BSWAP32('WAVE')) {
 110                 DEBUG(grf, 1, "LoadNewGRFSound [%s]: Invalid RIFF type", FioGetFilename(sound->file_slot));
 111                 return false;
 112         }
 113
 114         while (total_size >= 8) {
 115                 uint32 tag  = FioReadDword();
 116                 uint32 size = FioReadDword();
 117                 total_size -= 8;
 118                 if (total_size < size) {
 119                         DEBUG(grf, 1, "LoadNewGRFSound [%s]: Invalid RIFF", FioGetFilename(sound->file_slot));
 120                         return false;
 121                 }
 122                 total_size -= size;
 123
 124                 switch (tag) {
 125                         case ' tmf': // 'fmt '
 126                                 /* Audio format, must be 1 (PCM) */
 127                                 if (size < 16 || FioReadWord() != 1) {
 128                                         DEBUG(grf, 1, "LoadGRFSound [%s]: Invalid audio format", FioGetFilename(sound->file_slot));
 129                                         return false;
 130                                 }
 131                                 sound->channels = FioReadWord();
 132                                 sound->rate = FioReadDword();
 133                                 FioReadDword();
 134                                 FioReadWord();
 135                                 sound->bits_per_sample = FioReadWord();
 136
 137                                 /* The rest will be skipped */
 138                                 size -= 16;
 139                                 break;
 140
 141                         case 'atad': // 'data'
 142                                 sound->file_size   = size;
 143                                 sound->file_offset = FioGetPos();
 144
 145                                 DEBUG(grf, 2, "LoadNewGRFSound [%s]: channels %u, sample rate %u, bits per sample %u, length %u", FioGetFilename(sound->file_slot), sound->channels, sound->rate, sound->bits_per_sample, size);
 146                                 return true; // the fmt chunk has to appear before data, so we are finished
 147
 148                         default:
 149                                 /* Skip unknown chunks */
 150                                 break;
 151                 }
 152
 153                 /* Skip rest of chunk */
 154                 if (size > 0) FioSkipBytes(size);
 155         }
 156
 157         DEBUG(grf, 1, "LoadNewGRFSound [%s]: RIFF does not contain any sound data", FioGetFilename(sound->file_slot));
 158
 159         /* Clear everything that was read */
 160         MemSetT(sound, 0);
 161         return false;
 162 }
 163
 164 /**
 165  * Resolve NewGRF sound ID.
 166  * @param file NewGRF to get sound from.
 167  * @param sound_id GRF-specific sound ID. (GRF-local for IDs above ORIGINAL_SAMPLE_COUNT)
 168  * @return Translated (global) sound ID, or INVALID_SOUND.
 169  */
 170 SoundID GetNewGRFSoundID(const GRFFile *file, SoundID sound_id)
 171 {
 172         /* Global sound? */
 173         if (sound_id < ORIGINAL_SAMPLE_COUNT) return sound_id;
 174
 175         sound_id -= ORIGINAL_SAMPLE_COUNT;
 176         if (file == NULL || sound_id >= file->num_sounds) return INVALID_SOUND;
 177
 178         return file->sound_offset  + sound_id;
 179 }
 180
 181 /**
 182  * Checks whether a NewGRF wants to play a different vehicle sound effect.
 183  * @param v Vehicle to play sound effect for.
 184  * @param event Trigger for the sound effect.
 185  * @return false if the default sound effect shall be played instead.
 186  */
 187 bool PlayVehicleSound(const Vehicle *v, VehicleSoundEvent event)
 188 {
 189         if (!_settings_client.sound.vehicle) return true;
 190
 191         const GRFFile *file = v->GetGRF();
 192         uint16 callback;
 193
 194         /* If the engine has no GRF ID associated it can't ever play any new sounds */
 195         if (file == NULL) return false;
 196
 197         /* Check that the vehicle type uses the sound effect callback */
 198         if (!HasBit(EngInfo(v->engine_type)->callback_mask, CBM_VEHICLE_SOUND_EFFECT)) return false;
 199
 200         callback = GetVehicleCallback(CBID_VEHICLE_SOUND_EFFECT, event, 0, v->engine_type, v);
 201         /* Play default sound if callback fails */
 202         if (callback == CALLBACK_FAILED) return false;
 203
 204         callback = GetNewGRFSoundID(file, callback);
 205
 206         /* Play no sound, if result is invalid */
 207         if (callback == INVALID_SOUND) return true;
 208
 209         assert(callback < GetNumSounds());
 210         SndPlayVehicleFx(callback, v);
 211         return true;
 212 }
 213
 214 /**
 215  * Play a NewGRF sound effect at the location of a specific tile.
 216  * @param file NewGRF triggering the sound effect.
 217  * @param sound_id Sound effect the NewGRF wants to play.
 218  * @param tile Location of the effect.
 219  */
 220 void PlayTileSound(const GRFFile *file, SoundID sound_id, TileIndex tile)
 221 {
 222         sound_id = GetNewGRFSoundID(file, sound_id);
 223         if (sound_id == INVALID_SOUND) return;
 224
 225         assert(sound_id < GetNumSounds());
 226         SndPlayTileFx(sound_id, tile);
 227 }