soundclip.cpp

/***************************************************************************
 *   Copyright (C) 2005-2011 by the FIFE team                              *
 *   http://www.fifengine.net                                              *
 *   This file is part of FIFE.                                            *
 *                                                                         *
 *   FIFE is free software; you can redistribute it and/or                 *
 *   modify it under the terms of the GNU Lesser General Public            *
 *   License as published by the Free Software Foundation; either          *
 *   version 2.1 of the License, or (at your option) any later version.    *
 *                                                                         *
 *   This library 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     *
 *   Lesser General Public License for more details.                       *
 *                                                                         *
 *   You should have received a copy of the GNU Lesser General Public      *
 *   License along with this library; if not, write to the                 *
 *   Free Software Foundation, Inc.,                                       *
 *   51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA          *
 ***************************************************************************/

// Standard C++ library includes

// Platform specific includes
#include <sstream>

// 3rd party library includes

// FIFE includes
// These includes are split up in two parts, separated by one empty line
// First block: files included from the FIFE root src directory
// Second block: files included from the same folder
#include "util/base/exception.h"
#include "util/log/logger.h"
#include "loaders/native/audio/ogg_loader.h"

#include "soundclip.h"

namespace FIFE {
    static Logger _log(LM_AUDIO);

    SoundClip::SoundClip(IResourceLoader* loader) :
        IResource(createUniqueClipName(), loader),
        m_isstream(false),
        m_decoder(NULL),
        m_deletedecoder(false) {

    }

    SoundClip::SoundClip(const std::string& name, IResourceLoader* loader) :
        IResource(name, loader),
        m_isstream(false),
        m_decoder(NULL),
        m_deletedecoder(false) {

    }

    void SoundClip::load(){
        if (m_loader){
            m_loader->load(this);
        }
        else {  //no loader specified so find one to use
            if(m_name.find(".ogg", m_name.size() - 4) != std::string::npos) {
                OggLoader loader;
                loader.load(this);
            } else {
                FL_WARN(_log, LMsg() << "No audio-decoder available for file \"" << m_name << "\"!");
                throw InvalidFormat("Error: Ogg loader can't load files without ogg extension");
            }
        }

        assert(m_decoder);  //should be set by now

        m_isstream = m_decoder->needsStreaming();

        if (!m_isstream) {

            // only for non-streaming buffers
            SoundBufferEntry* ptr = new SoundBufferEntry();

            // iterate the bufs and fill them with data
            for (int32_t i = 0; i < BUFFER_NUM; i++) {

                if (m_decoder->decode(BUFFER_LEN)) {
                    // EOF or error
                    break;
                }

                // generate buffer and fill it with data
                alGenBuffers(1, &ptr->buffers[i]);

                alBufferData(ptr->buffers[i], m_decoder->getALFormat(), m_decoder->getBuffer(),
                    m_decoder->getBufferSize(), m_decoder->getSampleRate());

                CHECK_OPENAL_LOG(_log, LogManager::LEVEL_ERROR, "error copying data to buffers")

                ptr->usedbufs++;
            }

            m_decoder->releaseBuffer();

            // push the buffer information to the vector
            m_buffervec.push_back(ptr);

        }

        m_state = IResource::RES_LOADED;
    }

    void SoundClip::free(){
        if (m_state == IResource::RES_LOADED) {
            if (m_isstream) {
                // erase all elements from the list
                std::vector<SoundBufferEntry*>::iterator it;

                for (it = m_buffervec.begin(); it != m_buffervec.end(); ++it) {
                    if ((*it)->buffers[0] != 0) {
                        alDeleteBuffers(BUFFER_NUM, (*it)->buffers);
                    }
                    delete (*it);
                }
                m_buffervec.clear();
            }
            else {
                // for non-streaming soundclips
                SoundBufferEntry* ptr = m_buffervec.at(0);

                for(uint32_t i = 0; i < ptr->usedbufs; i++) {
                    alDeleteBuffers(1, &ptr->buffers[i]);
                }
            }
        }
        m_state = IResource::RES_NOT_LOADED;
    }

    uint32_t SoundClip::beginStreaming() {
        // create new sound buffer entry
        SoundBufferEntry* ptr = new SoundBufferEntry();
        ptr->usedbufs=0;
        alGenBuffers(BUFFER_NUM, ptr->buffers);

        CHECK_OPENAL_LOG(_log, LogManager::LEVEL_ERROR, "error creating streaming-buffers")

        m_buffervec.push_back(ptr);

        return m_buffervec.size()-1;
    }

    bool SoundClip::setStreamPos(uint32_t streamid, SoundPositionType type, float value) {
        uint64_t pos = 0;

        // convert position to bytes
        switch (type) {
            case SD_BYTE_POS:
                pos = static_cast<uint64_t>(value);
                break;
            case SD_TIME_POS:
                value *= m_decoder->getSampleRate();
            case SD_SAMPLE_POS:
                pos = static_cast<uint64_t>((m_decoder->getBitResolution() / 8) * (m_decoder->isStereo() ? 2 : 1) * value);
                break;
        }

        if (pos > m_decoder->getDecodedLength()) {
            // EOF!
            return true;
        }

        // set cursor position
        m_buffervec.at(streamid)->deccursor = pos;
        return false;
    }

    float SoundClip::getStreamPos(uint32_t streamid, SoundPositionType type) const{
        uint64_t pos = m_buffervec.at(streamid)->deccursor;
        switch(type) {
            case SD_BYTE_POS:
                return pos;
            case SD_SAMPLE_POS:
                return pos / (m_decoder->getBitResolution() / 8 * (m_decoder->isStereo() ? 2 : 1));
            case SD_TIME_POS:
                return pos / (m_decoder->getBitResolution() / 8 * (m_decoder->isStereo() ? 2 : 1) * m_decoder->getSampleRate());
        }
        return 0.0f;
    }

    void SoundClip::acquireStream(uint32_t streamid) {

        SoundBufferEntry* ptr = m_buffervec.at(streamid);

        for (int32_t i = 0; i < BUFFER_NUM; i++) {
            getStream(streamid, ptr->buffers[i]);
        }
    }

    bool SoundClip::getStream(uint32_t streamid, ALuint buffer) {

        SoundBufferEntry* ptr = m_buffervec.at(streamid);

        if (ptr->deccursor >= m_decoder->getDecodedLength()) {
            // EOF!
            return true;
        }

        // set cursor of decoder
        m_decoder->setCursor(ptr->deccursor);

        // Error while decoding file?
        if (m_decoder->decode(BUFFER_LEN)) {
            throw Exception("error while reading from audio file");
        }

        // fill the buffer with data
        alBufferData(buffer, m_decoder->getALFormat(),
            m_decoder->getBuffer(), m_decoder->getBufferSize(), m_decoder->getSampleRate());

        m_decoder->releaseBuffer();

        // update cursor
        ptr->deccursor += BUFFER_LEN;

        CHECK_OPENAL_LOG(_log, LogManager::LEVEL_ERROR, "error catching stream")

        return false;
    }

    void SoundClip::quitStreaming(uint32_t streamid) {
        // release the buffers
        SoundBufferEntry* ptr = m_buffervec.at(streamid);
        alDeleteBuffers(BUFFER_NUM, ptr->buffers);
        ptr->buffers[0] = 0;
    }

    SoundClip::~SoundClip() {
        free();

        // delete decoder
        if (m_deletedecoder && m_decoder != NULL) {
            delete m_decoder;
        }
    }

    std::string SoundClip::createUniqueClipName() {
            // automated counting for name generation, in case the user doesn't provide a name
            static uint32_t uniqueNumber = 0;
            static std::string baseName = "soundclip";

            std::ostringstream oss;
            oss << uniqueNumber << "_" << baseName;

            const std::string name = oss.str();
            ++uniqueNumber;

            return name;
    }
}