mirror of https://github.com/OpenTTD/OpenTTD
96 lines
3.4 KiB
C++
96 lines
3.4 KiB
C++
/*
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* This file is part of OpenTTD.
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* 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.
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* 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.
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* 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/>.
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*/
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/** @file sound_opus.cpp Loading of opus sounds. */
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#include "stdafx.h"
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#include "random_access_file_type.h"
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#include "sound_type.h"
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#include "soundloader_type.h"
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#include <opusfile.h>
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#include "safeguards.h"
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/** Opus sound loader. */
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class SoundLoader_Opus : public SoundLoader {
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public:
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SoundLoader_Opus() : SoundLoader("opus", "Opus sound loader", 10) {}
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static constexpr uint16_t OPUS_SAMPLE_RATE = 48000; ///< OpusFile always decodes at 48kHz.
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static constexpr uint8_t OPUS_SAMPLE_BITS = 16; ///< OpusFile op_read() uses 16 bits per sample.
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/* For good results, you will need at least 57 bytes (for a pure Opus-only stream). */
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static constexpr size_t MIN_OPUS_FILE_SIZE = 57U;
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/* It is recommended that this be large enough for at least 120 ms of data at 48 kHz per channel (5760 values per channel).
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* Smaller buffers will simply return less data, possibly consuming more memory to buffer the data internally. */
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static constexpr size_t DECODE_BUFFER_SAMPLES = 5760 * 2;
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static constexpr size_t DECODE_BUFFER_BYTES = DECODE_BUFFER_SAMPLES * sizeof(opus_int16);
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bool Load(SoundEntry &sound, bool new_format, std::vector<uint8_t> &data) override
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{
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if (!new_format) return false;
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/* At least 57 bytes are needed for an Opus-only file. */
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if (sound.file_size < MIN_OPUS_FILE_SIZE) return false;
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/* Test if data is an Ogg Opus stream, as identified by the initial file header. */
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auto filepos = sound.file->GetPos();
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std::vector<uint8_t> tmp(MIN_OPUS_FILE_SIZE);
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sound.file->ReadBlock(tmp.data(), tmp.size());
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if (op_test(nullptr, tmp.data(), tmp.size()) != 0) return false;
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/* Read the whole file into memory. */
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tmp.resize(sound.file_size);
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sound.file->SeekTo(filepos, SEEK_SET);
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sound.file->ReadBlock(tmp.data(), tmp.size());
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int error = 0;
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auto of = std::unique_ptr<OggOpusFile, OggOpusFileDeleter>(op_open_memory(tmp.data(), tmp.size(), &error));
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if (error != 0) return false;
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size_t datapos = 0;
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for (;;) {
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data.resize(datapos + DECODE_BUFFER_BYTES);
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int link_index;
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int read = op_read(of.get(), reinterpret_cast<opus_int16 *>(&data[datapos]), DECODE_BUFFER_BYTES, &link_index);
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if (read == 0) break;
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if (read < 0 || op_channel_count(of.get(), link_index) != 1) {
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/* Error reading, or incorrect channel count. */
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data.clear();
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return false;
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}
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datapos += read * sizeof(opus_int16);
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}
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/* OpusFile always decodes at 48kHz. */
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sound.channels = 1;
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sound.bits_per_sample = OPUS_SAMPLE_BITS;
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sound.rate = OPUS_SAMPLE_RATE;
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/* We resized by DECODE_BUFFER_BYTES just before finally reading zero bytes, undo this. */
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data.resize(data.size() - DECODE_BUFFER_BYTES);
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return true;
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}
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private:
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/** Helper class to RAII release an OggOpusFile. */
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struct OggOpusFileDeleter {
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void operator()(OggOpusFile *of)
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{
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if (of != nullptr) op_free(of);
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}
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};
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};
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static SoundLoader_Opus s_sound_loader_opus;
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