asset/audio.h

/* -*- mode: C; c-basic-offset: 4; intent-tabs-mode: nil -*-
 *
 * Sifteo SDK
 *
 * Copyright <c> 2012 Sifteo, Inc.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */

#pragma once

/*
 * This header needs to work in both userspace and non-userspace builds.
 */

#include <sifteo/abi.h>

namespace Sifteo {

struct AssetAudio {
    _SYSAudioModule sys;

    unsigned speed() const {
        return sys.sampleRate;
    }

    static AssetAudio fromPCM(const int16_t *samples, unsigned numSamples)
    {
        const AssetAudio result = {{
            /* sampleRate  */  0,
            /* loopStart   */  0,
            /* loopEnd     */  numSamples,
            /* loopType    */  _SYS_LOOP_REPEAT,
            /* type        */  _SYS_PCM,
            /* volume      */  _SYS_AUDIO_DEFAULT_VOLUME,
            /* dataSize    */  numSamples * sizeof samples[0],
            /* pData       */  reinterpret_cast<uintptr_t>(samples),
        }};
        return result;
    }

    template <typename T>
    static AssetAudio fromPCM(const T &samples) {
        return fromPCM(&samples[0], arraysize(samples));
    }
};

struct AssetTracker {
    _SYSXMSong song;

    unsigned numChannels() const {
        return song.nChannels;
    }

    unsigned numPatterns() const {
        return song.nPatterns;
    }

    unsigned numInstruments() const {
        return song.nInstruments;
    }

    unsigned tempo() const {
        return song.tempo;
    }

    unsigned bpm() const {
        return song.bpm;
    }
};

};  // namespace Sifteo