asf.h

/* ScummVM - Graphic Adventure Engine
 *
 * ScummVM is the legal property of its developers, whose names
 * are too numerous to list here. Please refer to the COPYRIGHT
 * file distributed with this source distribution.
 *
 * This program 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, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 */
 
#ifndef VIDEO_ASF_H
#define VIDEO_ASF_H
 
#include "audio/audiostream.h"
#include "audio/decoders/wma.h"
#include "common/array.h"
#include "common/stream.h"
 
namespace Video {
 
class ASFDemuxer {
public:
    static const int64 kNoTimestamp = (-0x7fffffffffffffffLL - 1);
    enum StreamType { kAudio, kVideo, kData, kUnknown };
    enum ReadResult { kObject, kEnd, kError };
 
    struct Stream {
        uint8 id = 0;
        StreamType type = kUnknown;
        uint64 timeOffset = 0;
        uint64 frameTime = 0;
        uint32 aspectNum = 0, aspectDen = 0;
        Common::Array<byte> typeData;
        Common::Array<byte> errorData;
    };
 
    struct Object {
        uint8 stream = 0;
        uint32 sequence = 0;
        int64 pts = kNoTimestamp, dts = kNoTimestamp;
        int64 position = -1;
        bool keyframe = false;
        Common::Array<byte> data;
        Common::Array<uint32> palette;
    };
 
    ASFDemuxer();
    ~ASFDemuxer();
    bool open(Common::SeekableReadStream *stream);
    void close();
    bool rewind();
    ReadResult readObject(Object &object);
    const Common::Array<Stream> &getStreams() const;
    uint64 getDuration() const;
    uint64 getSendDuration() const;
    uint64 getPreroll() const;
    bool endOfData() const;
 
private:
    ASFDemuxer(const ASFDemuxer &) = delete;
    ASFDemuxer &operator=(const ASFDemuxer &) = delete;
    struct Context;
    Context *_ctx;
};
 
Audio::SeekableAudioStream *makeASFAudioStream(Common::SeekableReadStream *stream, DisposeAfterUse::Flag disposeAfterUse);
 
class ASFAudioCodec {
public:
    ASFAudioCodec() : _codec(nullptr), _rate(0), _channels(0) {}
    ~ASFAudioCodec() { delete _codec; }
    bool open(const ASFDemuxer::Stream &stream);
    Audio::AudioStream *decode(const ASFDemuxer::Object &object);
    int getRate() const { return _rate; }
    bool isStereo() const { return _channels == 2; }
private:
    Audio::WMACodec *_codec;
    uint32 _rate;
    uint16 _channels;
};
 
} // End of namespace Video
 
#endif