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mp3.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 2
 * 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, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 * $URL$
 * $Id$
 *
 */

#ifndef SOUND_MP3_PSP_H
#define SOUND_MP3_PSP_H

#include "common/types.h"
#include "common/scummsys.h"

namespace Common {
class SeekableReadStream;
}

namespace Audio {

class AudioStream;
class SeekableAudioStream;

00041 class Mp3PspStream : public SeekableAudioStream {
protected:
      enum State {
            MP3_STATE_INIT,         // Need to init the decoder
            MP3_STATE_READY,  // ready for processing data
            MP3_STATE_EOS           // end of data reached (may need to loop)
      };

      #define MAX_SAMPLES_PER_FRAME 1152 * 2    /* x2 for stereo */
      int16 _pcmSamples[MAX_SAMPLES_PER_FRAME] __attribute__((aligned(64)));  // samples to output PCM data into
      byte _codecInBuffer[3072] __attribute__((aligned(64))); // the codec always needs alignment
      unsigned long _codecParams[65]__attribute__((aligned(64)));       // TODO: change to struct

      Common::SeekableReadStream *_inStream;
      DisposeAfterUse::Flag _disposeAfterUse;

      uint32 _pcmLength;            // how many pcm samples we have for this type of file (x2 this for stereo)

      uint _posInFrame;       // position in frame
      State _state;                 // what state the stream is in

      Timestamp _length;
      uint32 _sampleRate;
      bool _stereo;

      mad_timer_t _totalTime;
      mad_stream _stream;           //
      mad_header _header;           // This is all we need from libmad

      static bool _decoderInit;     // has the decoder been initialized
      static bool _decoderFail;     // has the decoder failed to load

      enum {
            BUFFER_SIZE = 5 * 8192
      };

      // This buffer contains a slab of input data
      byte _buf[BUFFER_SIZE + MAD_BUFFER_GUARD];

      void decodeMP3Data();
      void readMP3DataIntoBuffer();

      static bool loadStartAudioModule(const char *modname, int partition);
      int initStream();
      void findValidHeader();
      void deinitStream();
      void updatePcmLength();

      // to init and uninit ME decoder
      static bool initDecoder();
      static bool stopDecoder();

      // ME functions for stream
      bool initStreamME();
      void releaseStreamME();

public:
      Mp3PspStream(Common::SeekableReadStream *inStream, DisposeAfterUse::Flag dispose);
      ~Mp3PspStream();

      // This function avoids having to create streams when it's not possible
      static inline bool isOkToCreateStream() {
            if (_decoderFail)             // fatal failure
                  return false;
            if (!_decoderInit)                  // if we're not initialized
                  if (!initDecoder())           // check if we failed init
                        return false;
            return true;
      }

      int readBuffer(int16 *buffer, const int numSamples);

00113       bool endOfData() const        { return _state == MP3_STATE_EOS; }
00114       bool isStereo() const         { return _stereo; }
00115       int getRate() const                 { return _sampleRate; }

      bool seek(const Timestamp &where);
00118       Timestamp getLength() const { return _length; }
};

} // End of namespace Audio

#endif // #ifndef SOUND_MP3_PSP_H

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