snes9x/movie.cpp

/*****************************************************************************\
     Snes9x - Portable Super Nintendo Entertainment System (TM) emulator.
                This file is licensed under the Snes9x License.
   For further information, consult the LICENSE file in the root directory.
\*****************************************************************************/

//  Input recording/playback code
//  (c) Copyright 2004 blip

#ifndef __WIN32__
#include <unistd.h>
#endif
#include "snes9x.h"
#include "memmap.h"
#include "controls.h"
#include "snapshot.h"
#include "movie.h"
#include "language.h"
#ifdef NETPLAY_SUPPORT
#include "netplay.h"
#endif

#ifdef __WIN32__
#include <io.h>
#ifndef W_OK
#define W_OK 2
#endif
#define ftruncate chsize
#endif

#define SMV_MAGIC				0x1a564d53 // SMV0x1a
#define SMV_VERSION				5
#define SMV_HEADER_SIZE			64
#define SMV_EXTRAROMINFO_SIZE	30
#define BUFFER_GROWTH_SIZE		4096

enum MovieState
{
	MOVIE_STATE_NONE = 0,
	MOVIE_STATE_PLAY,
	MOVIE_STATE_RECORD
};

struct SMovie
{
	enum MovieState	State;

	FILE	*File;
	char	Filename[PATH_MAX + 1];
	char	ROMName[23];
	uint32	ROMCRC32;
	uint32	MovieId;
	uint32	Version;

	uint32	SaveStateOffset;
	uint32	ControllerDataOffset;

	uint8	ControllersMask;
	uint8	Opts;
	uint8	SyncFlags;
	uint32	MaxFrame;
	uint32	MaxSample;
	uint32	CurrentFrame;
	uint32	CurrentSample;
	uint32	BytesPerSample;
	uint32	RerecordCount;
	bool8	ReadOnly;
	uint8	PortType[2];
	int8	PortIDs[2][4];

	uint8	*InputBuffer;
	uint8	*InputBufferPtr;
	uint32	InputBufferSize;
};

static struct SMovie	Movie;

static uint8	prevPortType[2];
static int8		prevPortIDs[2][4];
static bool8	prevMouseMaster, prevSuperScopeMaster, prevJustifierMaster, prevMultiPlayer5Master;

static uint8	Read8 (uint8 *&);
static uint16	Read16 (uint8 *&);
static uint32	Read32 (uint8 *&);
static void		Write8 (uint8, uint8 *&);
static void		Write16 (uint16, uint8 *&);
static void		Write32 (uint32, uint8 *&);
static void		store_previous_settings (void);
static void		restore_previous_settings (void);
static void		store_movie_settings (void);
static void		restore_movie_settings (void);
static int		bytes_per_sample (void);
static void		reserve_buffer_space (uint32);
static void		reset_controllers (void);
static void		read_frame_controller_data (bool);
static void		write_frame_controller_data (void);
static void		flush_movie (void);
static void		truncate_movie (void);
static int		read_movie_header (FILE *, SMovie *);
static int		read_movie_extrarominfo (FILE *, SMovie *);
static void		write_movie_header (FILE *, SMovie *);
static void		write_movie_extrarominfo (FILE *, SMovie *);
static void		change_state (MovieState);

// HACK: reduce movie size by not storing changes that can only affect polled input in the movie for these types,
//       because currently no port sets these types to polling
#define SKIPPED_POLLING_PORT_TYPE(x)	(((x) == CTL_NONE) || ((x) == CTL_JOYPAD) || ((x) == CTL_MP5))

#ifndef max
#define max(a, b)	(((a) > (b)) ? (a) : (b))
#endif


static uint8 Read8 (uint8 *&ptr)
{
	uint8	v = *ptr++;
	return (v);
}

static uint16 Read16 (uint8 *&ptr)
{
	uint16	v = READ_WORD(ptr);
	ptr += 2;
	return (v);
}

static uint32 Read32 (uint8 *&ptr)
{
	uint32	v = READ_DWORD(ptr);
	ptr += 4;
	return (v);
}

static void Write8 (uint8 v, uint8 *&ptr)
{
	*ptr++ = v;
}

static void Write16 (uint16 v, uint8 *&ptr)
{
	WRITE_WORD(ptr, v);
	ptr += 2;
}

static void Write32 (uint32 v, uint8 *&ptr)
{
	WRITE_DWORD(ptr, v);
	ptr += 4;
}

static void store_previous_settings (void)
{
	for (int i = 0; i < 2; i++)
	{
		enum controllers pt;
		S9xGetController(i, &pt, &prevPortIDs[i][0], &prevPortIDs[i][1], &prevPortIDs[i][2], &prevPortIDs[i][3]);
		prevPortType[i] = (uint8) pt;
	}

	prevMouseMaster        = Settings.MouseMaster;
	prevSuperScopeMaster   = Settings.SuperScopeMaster;
	prevJustifierMaster    = Settings.JustifierMaster;
	prevMultiPlayer5Master = Settings.MultiPlayer5Master;
}

static void restore_previous_settings (void)
{
	Settings.MouseMaster        = prevMouseMaster;
	Settings.SuperScopeMaster   = prevSuperScopeMaster;
	Settings.JustifierMaster    = prevJustifierMaster;
	Settings.MultiPlayer5Master = prevMultiPlayer5Master;

	S9xSetController(0, (enum controllers) prevPortType[0], prevPortIDs[0][0], prevPortIDs[0][1], prevPortIDs[0][2], prevPortIDs[0][3]);
	S9xSetController(1, (enum controllers) prevPortType[1], prevPortIDs[1][0], prevPortIDs[1][1], prevPortIDs[1][2], prevPortIDs[1][3]);
}

static void store_movie_settings (void)
{
	for (int i = 0; i < 2; i++)
	{
		enum controllers pt;
		S9xGetController(i, &pt, &Movie.PortIDs[i][0], &Movie.PortIDs[i][1], &Movie.PortIDs[i][2], &Movie.PortIDs[i][3]);
		Movie.PortType[i] = (uint8) pt;
	}
}

static void restore_movie_settings (void)
{
	Settings.MouseMaster        = (Movie.PortType[0] == CTL_MOUSE      || Movie.PortType[1] == CTL_MOUSE);
	Settings.SuperScopeMaster   = (Movie.PortType[0] == CTL_SUPERSCOPE || Movie.PortType[1] == CTL_SUPERSCOPE);
	Settings.JustifierMaster    = (Movie.PortType[0] == CTL_JUSTIFIER  || Movie.PortType[1] == CTL_JUSTIFIER);
	Settings.MultiPlayer5Master = (Movie.PortType[0] == CTL_MP5        || Movie.PortType[1] == CTL_MP5);

	S9xSetController(0, (enum controllers) Movie.PortType[0], Movie.PortIDs[0][0], Movie.PortIDs[0][1], Movie.PortIDs[0][2], Movie.PortIDs[0][3]);
	S9xSetController(1, (enum controllers) Movie.PortType[1], Movie.PortIDs[1][0], Movie.PortIDs[1][1], Movie.PortIDs[1][2], Movie.PortIDs[1][3]);
}

static int bytes_per_sample (void)
{
	int	num_controllers = 0;

	for (int i = 0; i < 8; i++)
	{
		if (Movie.ControllersMask & (1 << i))
			num_controllers++;
	}

	int	bytes = CONTROLLER_DATA_SIZE * num_controllers;

	for (int p = 0; p < 2; p++)
	{
		if (Movie.PortType[p] == CTL_MOUSE)
			bytes += MOUSE_DATA_SIZE;
		else
		if (Movie.PortType[p] == CTL_SUPERSCOPE)
			bytes += SCOPE_DATA_SIZE;
		else
		if (Movie.PortType[p] == CTL_JUSTIFIER)
			bytes += JUSTIFIER_DATA_SIZE;
	}

	return (bytes);
}

static void reserve_buffer_space (uint32 space_needed)
{
	if (space_needed > Movie.InputBufferSize)
	{
		uint32 ptr_offset   = Movie.InputBufferPtr - Movie.InputBuffer;
		uint32 alloc_chunks = space_needed / BUFFER_GROWTH_SIZE;

		Movie.InputBufferSize = BUFFER_GROWTH_SIZE * (alloc_chunks + 1);
		Movie.InputBuffer     = (uint8 *) realloc(Movie.InputBuffer, Movie.InputBufferSize);
		Movie.InputBufferPtr  = Movie.InputBuffer + ptr_offset;
	}
}

static void reset_controllers (void)
{
	for (int i = 0; i < 8; i++)
		MovieSetJoypad(i, 0);

	uint8 clearedMouse[MOUSE_DATA_SIZE];
	memset(clearedMouse, 0, MOUSE_DATA_SIZE);
	clearedMouse[4] = 1;

	uint8 clearedScope[SCOPE_DATA_SIZE];
	memset(clearedScope, 0, SCOPE_DATA_SIZE);

	uint8 clearedJustifier[JUSTIFIER_DATA_SIZE];
	memset(clearedJustifier, 0, JUSTIFIER_DATA_SIZE);

	for (int p = 0; p < 2; p++)
	{
		MovieSetMouse(p, clearedMouse, true);
		MovieSetScope(p, clearedScope);
		MovieSetJustifier(p, clearedJustifier);
	}
}

static void read_frame_controller_data (bool addFrame)
{
	// reset code check
	if (Movie.InputBufferPtr[0] == 0xff)
	{
		bool reset = true;
		for (int i = 1; i < (int) Movie.BytesPerSample; i++)
		{
			if (Movie.InputBufferPtr[i] != 0xff)
			{
				reset = false;
				break;
			}
		}

		if (reset)
		{
			Movie.InputBufferPtr += Movie.BytesPerSample;
			S9xSoftReset();
			return;
		}
	}

	for (int i = 0; i < 8; i++)
	{
		if (Movie.ControllersMask & (1 << i))
			MovieSetJoypad(i, Read16(Movie.InputBufferPtr));
		else
			MovieSetJoypad(i, 0); // pretend the controller is disconnected
	}

	for (int p = 0; p < 2; p++)
	{
		if (Movie.PortType[p] == CTL_MOUSE)
		{
			uint8 buf[MOUSE_DATA_SIZE];
			memcpy(buf, Movie.InputBufferPtr, MOUSE_DATA_SIZE);
			Movie.InputBufferPtr += MOUSE_DATA_SIZE;
			MovieSetMouse(p, buf, !addFrame);
		}
		else
		if (Movie.PortType[p] == CTL_SUPERSCOPE)
		{
			uint8 buf[SCOPE_DATA_SIZE];
			memcpy(buf, Movie.InputBufferPtr, SCOPE_DATA_SIZE);
			Movie.InputBufferPtr += SCOPE_DATA_SIZE;
			MovieSetScope(p, buf);
		}
		else
		if (Movie.PortType[p] == CTL_JUSTIFIER)
		{
			uint8 buf[JUSTIFIER_DATA_SIZE];
			memcpy(buf, Movie.InputBufferPtr, JUSTIFIER_DATA_SIZE);
			Movie.InputBufferPtr += JUSTIFIER_DATA_SIZE;
			MovieSetJustifier(p, buf);
		}
	}
}

static void write_frame_controller_data (void)
{
	reserve_buffer_space((uint32) (Movie.InputBufferPtr + Movie.BytesPerSample - Movie.InputBuffer));

	for (int i = 0; i < 8; i++)
	{
		if (Movie.ControllersMask & (1 << i))
			Write16(MovieGetJoypad(i), Movie.InputBufferPtr);
		else
			MovieSetJoypad(i, 0); // pretend the controller is disconnected
	}

	for (int p = 0; p < 2; p++)
	{
		if (Movie.PortType[p] == CTL_MOUSE)
		{
			uint8 buf[MOUSE_DATA_SIZE];
			MovieGetMouse(p, buf);
			memcpy(Movie.InputBufferPtr, buf, MOUSE_DATA_SIZE);
			Movie.InputBufferPtr += MOUSE_DATA_SIZE;
		}
		else
		if (Movie.PortType[p] == CTL_SUPERSCOPE)
		{
			uint8 buf[SCOPE_DATA_SIZE];
			MovieGetScope(p, buf);
			memcpy(Movie.InputBufferPtr, buf, SCOPE_DATA_SIZE);
			Movie.InputBufferPtr += SCOPE_DATA_SIZE;
		}
		else
		if (Movie.PortType[p] == CTL_JUSTIFIER)
		{
			uint8 buf[JUSTIFIER_DATA_SIZE];
			MovieGetJustifier(p, buf);
			memcpy(Movie.InputBufferPtr, buf, JUSTIFIER_DATA_SIZE);
			Movie.InputBufferPtr += JUSTIFIER_DATA_SIZE;
		}
	}
}

static void flush_movie (void)
{
	if (!Movie.File)
		return;

	fseek(Movie.File, 0, SEEK_SET);
	write_movie_header(Movie.File, &Movie);
	fseek(Movie.File, Movie.ControllerDataOffset, SEEK_SET);

	size_t	ignore;
	ignore = fwrite(Movie.InputBuffer, 1, Movie.BytesPerSample * (Movie.MaxSample + 1), Movie.File);
}

static void truncate_movie (void)
{
	if (!Movie.File || !Settings.MovieTruncate)
		return;

	if (Movie.SaveStateOffset > Movie.ControllerDataOffset)
		return;

	int	ignore;
	ignore = ftruncate(fileno(Movie.File), Movie.ControllerDataOffset + Movie.BytesPerSample * (Movie.MaxSample + 1));
}

static int read_movie_header (FILE *fd, SMovie *movie)
{
	uint32	value;
	uint8	buf[SMV_HEADER_SIZE], *ptr = buf;

	if (fread(buf, 1, SMV_HEADER_SIZE, fd) != SMV_HEADER_SIZE)
		return (WRONG_FORMAT);

	value = Read32(ptr);
	if (value != SMV_MAGIC)
		return (WRONG_FORMAT);

	value = Read32(ptr);
	if(value > SMV_VERSION || value < 4)
		return (WRONG_VERSION);

	movie->Version              = value;
	movie->MovieId              = Read32(ptr);
	movie->RerecordCount        = Read32(ptr);
	movie->MaxFrame             = Read32(ptr);
	movie->ControllersMask      = Read8(ptr);
	movie->Opts                 = Read8(ptr);
	ptr++;
	movie->SyncFlags            = Read8(ptr);
	movie->SaveStateOffset      = Read32(ptr);
	movie->ControllerDataOffset = Read32(ptr);
	movie->MaxSample            = Read32(ptr);
	movie->PortType[0]          = Read8(ptr);
	movie->PortType[1]          = Read8(ptr);
	for (int p = 0; p < 2; p++)
	{
		for (int i = 0; i < 4; i++)
			movie->PortIDs[p][i] = Read8(ptr);
	}

	if (movie->MaxSample < movie->MaxFrame)
		movie->MaxSample = movie->MaxFrame;

	return (SUCCESS);
}

static int read_movie_extrarominfo (FILE *fd, SMovie *movie)
{
	uint8	buf[SMV_EXTRAROMINFO_SIZE], *ptr = buf;

	fseek(fd, movie->SaveStateOffset - SMV_EXTRAROMINFO_SIZE, SEEK_SET);

	if (fread(buf, 1, SMV_EXTRAROMINFO_SIZE, fd) != SMV_EXTRAROMINFO_SIZE)
		return (WRONG_FORMAT);

	ptr += 3; // zero bytes
	movie->ROMCRC32 = Read32(ptr);
	strncpy(movie->ROMName, (char *) ptr, 22);

	return (SUCCESS);
}

static void write_movie_header (FILE *fd, SMovie *movie)
{
	uint8	buf[SMV_HEADER_SIZE], *ptr = buf;

	memset(buf, 0, sizeof(buf));

	Write32(SMV_MAGIC, ptr);
	Write32(SMV_VERSION, ptr);
	Write32(movie->MovieId, ptr);
	Write32(movie->RerecordCount, ptr);
	Write32(movie->MaxFrame, ptr);
	Write8(movie->ControllersMask, ptr);
	Write8(movie->Opts, ptr);
	ptr++;
	Write8(movie->SyncFlags, ptr);
	Write32(movie->SaveStateOffset, ptr);
	Write32(movie->ControllerDataOffset, ptr);
	Write32(movie->MaxSample, ptr);
	Write8(movie->PortType[0], ptr);
	Write8(movie->PortType[1], ptr);
	for (int p = 0; p < 2; p++)
	{
		for (int i = 0; i < 4; i++)
			Write8(movie->PortIDs[p][i], ptr);
	}

	size_t	ignore;
	ignore = fwrite(buf, 1, SMV_HEADER_SIZE, fd);
}

static void write_movie_extrarominfo (FILE *fd, SMovie *movie)
{
	uint8	buf[SMV_EXTRAROMINFO_SIZE], *ptr = buf;

	Write8(0, ptr);
	Write8(0, ptr);
	Write8(0, ptr);
	Write32(movie->ROMCRC32, ptr);
	strncpy((char *) ptr, movie->ROMName, 23);

	size_t	ignore;
	ignore = fwrite(buf, 1, SMV_EXTRAROMINFO_SIZE, fd);
}

static void change_state (MovieState new_state)
{
	if (new_state == Movie.State)
		return;

	if (Movie.State == MOVIE_STATE_RECORD)
		flush_movie();

	if (new_state == MOVIE_STATE_NONE)
	{
		truncate_movie();
		fclose(Movie.File);
		Movie.File = NULL;

		if (S9xMoviePlaying() || S9xMovieRecording())
			restore_previous_settings();
	}

	Movie.State = new_state;
}

void S9xMovieFreeze (uint8 **buf, uint32 *size)
{
	if (!S9xMovieActive())
		return;

	uint32	size_needed;
	uint8	*ptr;

	size_needed = sizeof(Movie.MovieId) + sizeof(Movie.CurrentFrame) + sizeof(Movie.MaxFrame) + sizeof(Movie.CurrentSample) + sizeof(Movie.MaxSample);
	size_needed += (uint32) (Movie.BytesPerSample * (Movie.MaxSample + 1));
	*size = size_needed;

	*buf = new uint8[size_needed];
	ptr = *buf;
	if (!ptr)
		return;

	Write32(Movie.MovieId, ptr);
	Write32(Movie.CurrentFrame, ptr);
	Write32(Movie.MaxFrame, ptr);
	Write32(Movie.CurrentSample, ptr);
	Write32(Movie.MaxSample, ptr);

	memcpy(ptr, Movie.InputBuffer, Movie.BytesPerSample * (Movie.MaxSample + 1));
}

int S9xMovieUnfreeze (uint8 *buf, uint32 size)
{
	if (!S9xMovieActive())
		return (FILE_NOT_FOUND);

	if (size < sizeof(Movie.MovieId) + sizeof(Movie.CurrentFrame) + sizeof(Movie.MaxFrame) + sizeof(Movie.CurrentSample) + sizeof(Movie.MaxSample))
		return (WRONG_FORMAT);

	uint8	*ptr = buf;

	uint32	movie_id       = Read32(ptr);
	uint32	current_frame  = Read32(ptr);
	uint32	max_frame      = Read32(ptr);
	uint32	current_sample = Read32(ptr);
	uint32	max_sample     = Read32(ptr);
	uint32	space_needed   = (Movie.BytesPerSample * (max_sample + 1));

	if (current_frame > max_frame || current_sample > max_sample || space_needed > size)
		return (WRONG_MOVIE_SNAPSHOT);

	if (Settings.WrongMovieStateProtection)
		if (movie_id != Movie.MovieId)
			if (max_frame < Movie.MaxFrame || max_sample < Movie.MaxSample || memcmp(Movie.InputBuffer, ptr, space_needed))
				return (WRONG_MOVIE_SNAPSHOT);

	if (!Movie.ReadOnly)
	{
		change_state(MOVIE_STATE_RECORD);

		Movie.CurrentFrame  = current_frame;
		Movie.MaxFrame      = max_frame;
		Movie.CurrentSample = current_sample;
		Movie.MaxSample     = max_sample;
		Movie.RerecordCount++;

		store_movie_settings();

		reserve_buffer_space(space_needed);
		memcpy(Movie.InputBuffer, ptr, space_needed);

		flush_movie();
		fseek(Movie.File, Movie.ControllerDataOffset + (Movie.BytesPerSample * (Movie.CurrentSample + 1)), SEEK_SET);
	}
	else
	{
      uint32   space_processed = (Movie.BytesPerSample * (current_sample + 1));
      if (current_frame > Movie.MaxFrame || current_sample > Movie.MaxSample || memcmp(Movie.InputBuffer, ptr, space_processed))
			return (SNAPSHOT_INCONSISTENT);

		change_state(MOVIE_STATE_PLAY);

		Movie.CurrentFrame  = current_frame;
		Movie.CurrentSample = current_sample;
	}

	Movie.InputBufferPtr = Movie.InputBuffer + (Movie.BytesPerSample * Movie.CurrentSample);
	read_frame_controller_data(true);

	return (SUCCESS);
}

int S9xMovieOpen (const char *filename, bool8 read_only)
{
	FILE	*fd;
	STREAM	stream;
	int		result;
	int		fn;

	if (!(fd = fopen(filename, "rb+")))
	{
		if (!(fd = fopen(filename, "rb")))
			return (FILE_NOT_FOUND);
		else
			read_only = TRUE;
	}

	change_state(MOVIE_STATE_NONE);

	result = read_movie_header(fd, &Movie);
	if (result != SUCCESS)
	{
		fclose(fd);
		return (result);
	}

	read_movie_extrarominfo(fd, &Movie);

	fflush(fd);
	fn = fileno(fd);

	store_previous_settings();
	restore_movie_settings();

	lseek(fn, Movie.SaveStateOffset, SEEK_SET);

    // reopen stream to access as gzipped data
    stream = REOPEN_STREAM(fn, "rb");
	if (!stream)
		return (FILE_NOT_FOUND);

	if (Movie.Opts & MOVIE_OPT_FROM_RESET)
	{
		S9xReset();
		reset_controllers();
		result = (READ_STREAM(Memory.SRAM, 0x20000, stream) == 0x20000) ? SUCCESS : WRONG_FORMAT;
	}
	else
		result = S9xUnfreezeFromStream(stream);

    // do not close stream but close FILE *
    // (msvcrt will try to close all open FILE *handles on exit - if we do CLOSE_STREAM here
    //  the underlying file will be closed by zlib, causing problems when msvcrt tries to do it)
    delete stream;
    fclose(fd);

	if (result != SUCCESS)
		return (result);

	if (!(fd = fopen(filename, "rb+")))
	{
		if (!(fd = fopen(filename, "rb")))
			return (FILE_NOT_FOUND);
		else
			read_only = TRUE;
	}

	if (fseek(fd, Movie.ControllerDataOffset, SEEK_SET))
	{
		fclose(fd);
		return (WRONG_FORMAT);
	}

	Movie.File           = fd;
	Movie.BytesPerSample = bytes_per_sample();
	Movie.InputBufferPtr = Movie.InputBuffer;
	reserve_buffer_space(Movie.BytesPerSample * (Movie.MaxSample + 1));

	size_t	ignore;
	ignore = fread(Movie.InputBufferPtr, 1, Movie.BytesPerSample * (Movie.MaxSample + 1), fd);

	// read "baseline" controller data
	if (Movie.MaxSample && Movie.MaxFrame)
		read_frame_controller_data(true);

	Movie.CurrentFrame  = 0;
	Movie.CurrentSample = 0;
	Movie.ReadOnly      = read_only;
	strncpy(Movie.Filename, filename, PATH_MAX + 1);
	Movie.Filename[PATH_MAX] = 0;

	change_state(MOVIE_STATE_PLAY);

	S9xUpdateFrameCounter(-1);

	S9xMessage(S9X_INFO, S9X_MOVIE_INFO, MOVIE_INFO_REPLAY);

	return (SUCCESS);
}

int S9xMovieCreate (const char *filename, uint8 controllers_mask, uint8 opts, const wchar_t *metadata, int metadata_length)
{
	FILE	*fd;
	STREAM	stream;

	if (controllers_mask == 0)
		return (WRONG_FORMAT);

	if (!(fd = fopen(filename, "wb")))
		return (FILE_NOT_FOUND);

	if (metadata_length > MOVIE_MAX_METADATA)
		metadata_length = MOVIE_MAX_METADATA;

	change_state(MOVIE_STATE_NONE);

	store_previous_settings();
	store_movie_settings();

	Movie.MovieId              = (uint32) time(NULL);
	Movie.RerecordCount        = 0;
	Movie.MaxFrame             = 0;
	Movie.MaxSample            = 0;
	Movie.SaveStateOffset      = SMV_HEADER_SIZE + (sizeof(uint16) * metadata_length) + SMV_EXTRAROMINFO_SIZE;
	Movie.ControllerDataOffset = 0;
	Movie.ControllersMask      = controllers_mask;
	Movie.Opts                 = opts;
	Movie.SyncFlags            = MOVIE_SYNC_DATA_EXISTS | MOVIE_SYNC_HASROMINFO;

	write_movie_header(fd, &Movie);

	// convert wchar_t metadata string/array to a uint16 array
	// XXX: UTF-8 is much better...
	if (metadata_length > 0)
	{
		uint8 meta_buf[sizeof(uint16) * MOVIE_MAX_METADATA];
		for (int i = 0; i < metadata_length; i++)
		{
			uint16 c = (uint16) metadata[i];
			meta_buf[i * 2]     = (uint8) (c & 0xff);
			meta_buf[i * 2 + 1] = (uint8) ((c >> 8) & 0xff);
		}

		size_t	ignore;
		ignore = fwrite(meta_buf, sizeof(uint16), metadata_length, fd);
	}

	Movie.ROMCRC32 = Memory.ROMCRC32;
	strncpy(Movie.ROMName, Memory.RawROMName, 23);

	write_movie_extrarominfo(fd, &Movie);

	fclose(fd);

	stream = OPEN_STREAM(filename, "ab");
	if (!stream)
		return (FILE_NOT_FOUND);

	if (opts & MOVIE_OPT_FROM_RESET)
	{
		S9xReset();
		reset_controllers();
		WRITE_STREAM(Memory.SRAM, 0x20000, stream);
	}
	else
		S9xFreezeToStream(stream);

	CLOSE_STREAM(stream);

	if (!(fd = fopen(filename, "rb+")))
		return (FILE_NOT_FOUND);

	fseek(fd, 0, SEEK_END);
	Movie.ControllerDataOffset = (uint32) ftell(fd);

	// 16-byte align the controller input, for hex-editing friendliness if nothing else
	while (Movie.ControllerDataOffset % 16)
	{
		fputc(0xcc, fd); // arbitrary
		Movie.ControllerDataOffset++;
	}

	// write "baseline" controller data
	Movie.File           = fd;
	Movie.BytesPerSample = bytes_per_sample();
	Movie.InputBufferPtr = Movie.InputBuffer;
	write_frame_controller_data();

	Movie.CurrentFrame  = 0;
	Movie.CurrentSample = 0;
	Movie.ReadOnly      = false;
	strncpy(Movie.Filename, filename, PATH_MAX + 1);
	Movie.Filename[PATH_MAX] = 0;

	change_state(MOVIE_STATE_RECORD);

	S9xUpdateFrameCounter(-1);

	S9xMessage(S9X_INFO, S9X_MOVIE_INFO, MOVIE_INFO_RECORD);

	return (SUCCESS);
}

int S9xMovieGetInfo (const char *filename, struct MovieInfo *info)
{
	FILE	*fd;
	SMovie	local_movie;
	int		metadata_length;
	int		result, i;

	flush_movie();

	memset(info, 0, sizeof(*info));

	if (!(fd = fopen(filename, "rb")))
		return (FILE_NOT_FOUND);

	result = read_movie_header(fd, &local_movie);
	if (result != SUCCESS)
	{
		fclose(fd);
		return (result);
	}

	info->TimeCreated     = (time_t) local_movie.MovieId;
	info->Version         = local_movie.Version;
	info->Opts            = local_movie.Opts;
	info->SyncFlags       = local_movie.SyncFlags;
	info->ControllersMask = local_movie.ControllersMask;
	info->RerecordCount   = local_movie.RerecordCount;
	info->LengthFrames    = local_movie.MaxFrame;
	info->LengthSamples   = local_movie.MaxSample;
	info->PortType[0]     = local_movie.PortType[0];
	info->PortType[1]     = local_movie.PortType[1];

	if (local_movie.SaveStateOffset > SMV_HEADER_SIZE)
	{
		uint8	meta_buf[sizeof(uint16) * MOVIE_MAX_METADATA];
		int		curRomInfoSize = (local_movie.SyncFlags & MOVIE_SYNC_HASROMINFO) ? SMV_EXTRAROMINFO_SIZE : 0;

		metadata_length = ((int) local_movie.SaveStateOffset - SMV_HEADER_SIZE - curRomInfoSize) / sizeof(uint16);
		metadata_length = (metadata_length >= MOVIE_MAX_METADATA) ? MOVIE_MAX_METADATA - 1 : metadata_length;
		metadata_length = (int) fread(meta_buf, sizeof(uint16), metadata_length, fd);

		for (i = 0; i < metadata_length; i++)
		{
			uint16 c = meta_buf[i * 2] | (meta_buf[i * 2 + 1] << 8);
			info->Metadata[i] = (wchar_t) c;
		}

		info->Metadata[i] = '\0';
	}
	else
		info->Metadata[0] = '\0';

	read_movie_extrarominfo(fd, &local_movie);

	info->ROMCRC32 = local_movie.ROMCRC32;
	strncpy(info->ROMName, local_movie.ROMName, 23);

	fclose(fd);
	if ((fd = fopen(filename, "r+")) == NULL)
		info->ReadOnly = true;
	else
		fclose(fd);

	return (SUCCESS);
}

void S9xMovieUpdate (bool addFrame)
{
	switch (Movie.State)
	{
		case MOVIE_STATE_PLAY:
		{
			if (Movie.CurrentFrame >= Movie.MaxFrame || Movie.CurrentSample >= Movie.MaxSample)
			{
				change_state(MOVIE_STATE_NONE);
				S9xMessage(S9X_INFO, S9X_MOVIE_INFO, MOVIE_INFO_END);
				return;
			}
			else
			{
				if (addFrame)
					S9xUpdateFrameCounter();
				else
				if (SKIPPED_POLLING_PORT_TYPE(Movie.PortType[0]) && SKIPPED_POLLING_PORT_TYPE(Movie.PortType[1]))
					return;

				read_frame_controller_data(addFrame);
				Movie.CurrentSample++;
				if (addFrame)
					Movie.CurrentFrame++;
			}

			break;
		}

		case MOVIE_STATE_RECORD:
		{
			if (addFrame)
				S9xUpdateFrameCounter();
			else
			if (SKIPPED_POLLING_PORT_TYPE(Movie.PortType[0]) && SKIPPED_POLLING_PORT_TYPE(Movie.PortType[1]))
				return;

			write_frame_controller_data();
			Movie.MaxSample = ++Movie.CurrentSample;
			if (addFrame)
				Movie.MaxFrame = ++Movie.CurrentFrame;

			size_t	ignore;
			ignore = fwrite((Movie.InputBufferPtr - Movie.BytesPerSample), 1, Movie.BytesPerSample, Movie.File);

			break;
		}

		default:
		{
			if (addFrame)
				S9xUpdateFrameCounter();

			break;
		}
	}
}

void S9xMovieUpdateOnReset (void)
{
	if (Movie.State == MOVIE_STATE_RECORD)
	{
		reserve_buffer_space((uint32) (Movie.InputBufferPtr + Movie.BytesPerSample - Movie.InputBuffer));
		memset(Movie.InputBufferPtr, 0xFF, Movie.BytesPerSample);
		Movie.InputBufferPtr += Movie.BytesPerSample;
		Movie.MaxSample = ++Movie.CurrentSample;
		Movie.MaxFrame = ++Movie.CurrentFrame;

		size_t	ignore;
		ignore = fwrite((Movie.InputBufferPtr - Movie.BytesPerSample), 1, Movie.BytesPerSample, Movie.File);
	}
}

void S9xMovieInit (void)
{
	memset(&Movie, 0, sizeof(Movie));
	Movie.State = MOVIE_STATE_NONE;
}

void S9xMovieStop (bool8 suppress_message)
{
	if (Movie.State != MOVIE_STATE_NONE)
	{
		change_state(MOVIE_STATE_NONE);

		if (!suppress_message)
			S9xMessage(S9X_INFO, S9X_MOVIE_INFO, MOVIE_INFO_STOP);
	}
}

void S9xMovieShutdown (void)
{
	if (S9xMovieActive())
		S9xMovieStop(TRUE);
}

bool8 S9xMovieActive (void)
{
	return (Movie.State != MOVIE_STATE_NONE);
}

bool8 S9xMoviePlaying (void)
{
	return (Movie.State == MOVIE_STATE_PLAY);
}

bool8 S9xMovieRecording (void)
{
	return (Movie.State == MOVIE_STATE_RECORD);
}

uint8 S9xMovieControllers (void)
{
	return (Movie.ControllersMask);
}

bool8 S9xMovieReadOnly (void)
{
	if (!S9xMovieActive())
		return (FALSE);
	return (Movie.ReadOnly);
}

uint32 S9xMovieGetId (void)
{
	if (!S9xMovieActive())
		return (0);
	return (Movie.MovieId);
}

uint32 S9xMovieGetLength (void)
{
	if (!S9xMovieActive())
		return (0);
	return (Movie.MaxFrame);
}

uint32 S9xMovieGetFrameCounter (void)
{
	if (!S9xMovieActive())
		return (0);
	return (Movie.CurrentFrame);
}

void S9xMovieToggleRecState (void)
{
	Movie.ReadOnly = !Movie.ReadOnly;

	if (Movie.ReadOnly)
	   S9xMessage(S9X_INFO, S9X_MOVIE_INFO, "Movie is now read-only.");
	else
	   S9xMessage(S9X_INFO, S9X_MOVIE_INFO, "Movie is now read+write.");
}

void S9xMovieToggleFrameDisplay (void)
{
	Settings.DisplayMovieFrame = !Settings.DisplayMovieFrame;
	S9xReRefresh();
}

void S9xUpdateFrameCounter (int offset)
{
	extern bool8	pad_read;

	offset++;

	if (!Settings.DisplayMovieFrame)
		*GFX.FrameDisplayString = 0;
	else
	if (Movie.State == MOVIE_STATE_RECORD)
		sprintf(GFX.FrameDisplayString, "Recording frame: %d%s",
			max(0, (int) (Movie.CurrentFrame + offset)), pad_read || !Settings.MovieNotifyIgnored ? "" : " (ignored)");
	else
	if (Movie.State == MOVIE_STATE_PLAY)
		sprintf(GFX.FrameDisplayString, "Playing frame: %d / %d",
			max(0, (int) (Movie.CurrentFrame + offset)), Movie.MaxFrame);
#ifdef NETPLAY_SUPPORT
	else
	if (Settings.NetPlay)
		sprintf(GFX.FrameDisplayString, "%s frame: %d", Settings.NetPlayServer ? "Server" : "Client",
			max(0, (int) (NetPlay.FrameCount + offset)));
#endif
}