/*
 * libsmackerdec - Smacker video decoder
 * Copyright (C) 2011 Barry Duncan
 *
 * This library 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
 */

/* This code is based on smacker.c from the FFmpeg project which can be obtained from http://www.ffmpeg.org/
 * below is the license from smacker.c
 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */

/*
 * Smacker decoder
 * Copyright (c) 2006 Konstantin Shishkov
 *
 * This file is part of FFmpeg.
 *
 * FFmpeg 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.
 *
 * FFmpeg 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 FFmpeg; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

#ifndef _SmackerDecoder_h_
#define _SmackerDecoder_h_

#include <stdint.h>
#include "FileStream.h"
#include "BitReader.h"
#include <vector>

// exportable interface
struct SmackerHandle
{
	bool isValid;
	int instanceIndex;
};

struct SmackerAudioInfo
{
	uint32_t sampleRate;
	uint8_t  nChannels;
	uint8_t  bitsPerSample;

	uint32_t idealBufferSize;
};

SmackerHandle     Smacker_Open                 (const char* fileName);
void              Smacker_Close                (SmackerHandle &handle);
uint32_t          Smacker_GetNumAudioTracks    (SmackerHandle &handle);
SmackerAudioInfo  Smacker_GetAudioTrackDetails (SmackerHandle &handle, uint32_t trackIndex);
uint32_t          Smacker_GetAudioData         (SmackerHandle &handle, uint32_t trackIndex, int16_t *data);
uint32_t          Smacker_GetNumFrames         (SmackerHandle &handle);
void              Smacker_GetFrameSize         (SmackerHandle &handle, uint32_t &width, uint32_t &height);
uint32_t          Smacker_GetCurrentFrameNum   (SmackerHandle &handle);
uint32_t          Smacker_GetNextFrame         (SmackerHandle &handle);
float             Smacker_GetFrameRate         (SmackerHandle &handle);
void              Smacker_GetPalette           (SmackerHandle &handle, uint8_t *palette);
void              Smacker_GetFrame             (SmackerHandle &handle, uint8_t *frame);
void              Smacker_GotoFrame            (SmackerHandle &handle, uint32_t frameNum);

const int kMaxAudioTracks = 7;

// forward declare
struct HuffContext;
struct DBCtx;

struct SmackerAudioTrack
{
	uint32_t sizeInBytes;
	uint32_t flags;
	uint32_t sampleRate;
	uint8_t  nChannels;
	uint8_t  bitsPerSample;
//	int	     compressionType;

	uint8_t  *buffer;
	uint32_t bufferSize;

	uint32_t bytesReadThisFrame;
};

class SmackerDecoder
{
	public:
		uint32_t frameWidth;
		uint32_t frameHeight;

		SmackerDecoder();
		~SmackerDecoder();

		bool Open(const std::string &fileName);
		void GetPalette(uint8_t *palette);
		void GetFrame(uint8_t *frame);

		SmackerAudioInfo GetAudioTrackDetails(uint32_t trackIndex);
		uint32_t GetAudioData(uint32_t trackIndex, int16_t *audioBuffer);
		uint32_t GetNumFrames();
		uint32_t GetCurrentFrameNum();
		float GetFrameRate();
		void GetNextFrame();
		void GotoFrame(uint32_t frameNum);

	private:
		SmackerCommon::FileStream file;
		char signature[4];

		// video related members
		uint32_t nFrames;
		uint32_t fps; // frames per second

		uint8_t palette[768];
		uint8_t *picture;

		bool isVer4;

		SmackerAudioTrack audioTracks[kMaxAudioTracks];

		uint32_t treeSize;
		uint32_t mMapSize, MClrSize, fullSize, typeSize;

		std::vector<int> mmap_tbl;
		std::vector<int> mclr_tbl;
		std::vector<int> full_tbl;
		std::vector<int> type_tbl;

		int mmap_last[3], mclr_last[3], full_last[3], type_last[3];

		std::vector<uint32_t> frameSizes;
		std::vector<uint8_t> frameFlags;

		uint32_t currentFrame;
		int32_t nextPos;

		bool DecodeHeaderTrees();
		int DecodeHeaderTree(SmackerCommon::BitReader &bits, std::vector<int> &recodes, int *last, int size);
		int DecodeTree(SmackerCommon::BitReader &bits, HuffContext *hc, uint32_t prefix, int length);
		int DecodeBigTree(SmackerCommon::BitReader &bits, HuffContext *hc, DBCtx *ctx);
		int GetCode(SmackerCommon::BitReader &bits, std::vector<int> &recode, int *last);
		int ReadPacket();
		int DecodeFrame(uint32_t frameSize);
		void GetFrameSize(uint32_t &width, uint32_t &height);
		int DecodeAudio(uint32_t size, SmackerAudioTrack &track);
};

#endif