soundloader_raw.cpp

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/*
 * This file is part of OpenTTD.
 * 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.
 * 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.
 * 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/>.
 */
 
#include "stdafx.h"
#include "random_access_file_type.h"
#include "sound_type.h"
#include "soundloader_type.h"
 
#include "safeguards.h"
 
class SoundLoader_Raw : public SoundLoader {
public:
  SoundLoader_Raw() : SoundLoader("raw", "Raw PCM loader", INT_MAX) {}
 
  static constexpr uint16_t RAW_SAMPLE_RATE = 11025; 
  static constexpr uint8_t RAW_SAMPLE_BITS = 8; 
 
  bool Load(SoundEntry &sound, bool new_format, std::vector<uint8_t> &data) override
  {
    /* Raw sounds are apecial case for the jackhammer sound (name in Windows sample.cat is "Corrupt sound")
     * It's not a RIFF file, but raw PCM data.
     * We no longer compare by name as the same file in the DOS sample.cat does not have a unique name. */
 
    /* Raw sounds are not permitted in a new format file. */
    if (new_format) return false;
 
    sound.channels = 1;
    sound.rate = RAW_SAMPLE_RATE;
    sound.bits_per_sample = RAW_SAMPLE_BITS;
 
    /* Allocate an extra sample to ensure the runtime resampler doesn't go out of bounds.*/
    data.reserve(sound.file_size + 1);
    data.resize(sound.file_size);
    sound.file->ReadBlock(std::data(data), std::size(data));
 
    /* Convert 8-bit samples from unsigned to signed. */
    for (auto &sample : data) {
      sample = sample - 128;
    }
 
    return true;
  }
};
 
static SoundLoader_Raw s_sound_loader_raw;