(*

 * Hedgewars, a free turn based strategy game

 * Copyright (c) 2004-2015 Andrey Korotaev <unC0Rr@gmail.com>

 *

 * 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; version 2 of the License

 *

 * 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 St, Fifth Floor, Boston, MA  02110-1301  USA

 *)

{$INCLUDE "options.inc"}

unit uVideoRec;

{$IFNDEF USE_VIDEO_RECORDING}

interface

implementation

end.

{$ELSE}

{$IFNDEF WIN32}

    {$linklib avwrapper}

{$ENDIF}

interface

var flagPrerecording: boolean = false;

function BeginVideoRecording: Boolean;

function LoadNextCameraPosition(out newRealTicks, newGameTicks: LongInt): Boolean;

procedure EncodeFrame;

procedure StopVideoRecording;

procedure BeginPreRecording;

procedure StopPreRecording;

procedure SaveCameraPosition;

procedure initModule;

procedure freeModule;

implementation

type TAddFileLogRaw = procedure (s: pchar); cdecl;

const AvwrapperLibName = 'libavwrapper';

function AVWrapper_Init(

              AddLog: TAddFileLogRaw;

              filename, desc, soundFile, format, vcodec, acodec: PChar;

              width, height, framerateNum, framerateDen, vquality: LongInt): LongInt; cdecl; external AvwrapperLibName;

function AVWrapper_Close: LongInt; cdecl; external AvwrapperLibName;

function AVWrapper_WriteFrame(rgb: PByte): LongInt; cdecl; external AvwrapperLibName;

type TFrame = record

                  realTicks: LongWord;

                  gameTicks: LongWord;

                  CamX, CamY: LongInt;

                  zoom: single;

              end;

var YCbCr_Planes: array[0..2] of PByte;

    RGB_Buffer: PByte;

    cameraFile: File of TFrame;

    audioFile: File;

    numPixels: LongWord;

    startTime, numFrames, curTime, progress, maxProgress: LongWord;

    soundFilePath: shortstring;

    thumbnailSaved : Boolean;

function BeginVideoRecording: Boolean;

var filename, desc: shortstring;

begin

    AddFileLog('BeginVideoRecording');

{$IOCHECKS OFF}

    // open file with prerecorded camera positions

    filename:= UserPathPrefix + '/VideoTemp/' + RecPrefix + '.txtin';

    Assign(cameraFile, filename);

    Reset(cameraFile);

    maxProgress:= FileSize(cameraFile);

    if IOResult <> 0 then

    begin

        AddFileLog('Error: Could not read from ' + filename);

        exit(false);

    end;

{$IOCHECKS ON}

    // store some description in output file

    desc:= '';

    if UserNick <> '' then

        desc:= desc + 'Player: ' + UserNick + #10;

    if recordFileName <> '' then

        desc:= desc + 'Record: ' + recordFileName + #10;

    if cMapName <> '' then

        desc:= desc + 'Map: ' + cMapName + #10;

    if Theme <> '' then

        desc:= desc + 'Theme: ' + Theme + #10;

    desc:= desc + 'prefix[' + RecPrefix + ']prefix';

    filename:= UserPathPrefix + '/VideoTemp/' + RecPrefix;

    soundFilePath:= UserPathPrefix + '/VideoTemp/' + RecPrefix + '.sw';

    if checkFails(AVWrapper_Init(@AddFileLogRaw

        , PChar(ansistring(filename))

        , PChar(ansistring(desc))

        , PChar(ansistring(soundFilePath))

        , PChar(ansistring(cAVFormat))

        , PChar(ansistring(cVideoCodec))

        , PChar(ansistring(cAudioCodec))

        , cScreenWidth, cScreenHeight, cVideoFramerateNum, cVideoFramerateDen, cVideoQuality) >= 0,

        'AVWrapper_Init failed',

        true) then exit(false);

    numPixels:= cScreenWidth*cScreenHeight;

    RGB_Buffer:= GetMem(4*numPixels);

    if RGB_Buffer = nil then

    begin

        AddFileLog('Error: Could not allocate memory for video recording (RGB buffer).');

        exit(false);

    end;

    curTime:= 0;

    numFrames:= 0;

    progress:= 0;

    BeginVideoRecording:= true;

end;

procedure StopVideoRecording;

begin

    AddFileLog('StopVideoRecording');

    FreeMem(RGB_Buffer, 4*numPixels);

    Close(cameraFile);

    if AVWrapper_Close() < 0 then

        halt(-1);

    Erase(cameraFile);

    DeleteFile(soundFilePath);

    SendIPC(_S'v'); // inform frontend that we finished

end;

procedure EncodeFrame;

var s: shortstring;

begin

    // read pixels from OpenGL

    glReadPixels(0, 0, cScreenWidth, cScreenHeight, GL_RGBA, GL_UNSIGNED_BYTE, RGB_Buffer);

    if AVWrapper_WriteFrame(RGB_Buffer) < 0 then

        halt(-1);

    // inform frontend that we have encoded new frame

    s[0]:= #3;

    s[1]:= 'p'; // p for progress

    SDLNet_Write16(progress*10000 div maxProgress, @s[2]);

    SendIPC(s);

    inc(numFrames);

end;

function LoadNextCameraPosition(out newRealTicks, newGameTicks: LongInt): Boolean;

var frame: TFrame = (realTicks: 0; gameTicks: 0; CamX: 0; CamY: 0; zoom: 0);

begin

    // we need to skip or duplicate frames to match target framerate

    while Int64(curTime)*cVideoFramerateNum <= Int64(numFrames)*cVideoFramerateDen*1000 do

    begin

    {$IOCHECKS OFF}

        if eof(cameraFile) then

            exit(false);

        BlockRead(cameraFile, frame, 1);

    {$IOCHECKS ON}

        curTime:= frame.realTicks;

        WorldDx:= frame.CamX;

        WorldDy:= frame.CamY + cScreenHeight div 2;

        zoom:= frame.zoom*cScreenWidth;

        ZoomValue:= zoom;

        inc(progress);

        newRealTicks:= frame.realTicks;

        newGameTicks:= frame.gameTicks;

    end;

    LoadNextCameraPosition:= true;

end;

// Callback which records sound.

// This procedure may be called from different thread.

procedure RecordPostMix(udata: pointer; stream: PByte; len: LongInt); cdecl;

begin

    udata:= udata; // avoid warning

{$IOCHECKS OFF}

    BlockWrite(audioFile, stream^, len);

{$IOCHECKS ON}

end;

procedure SaveThumbnail;

var thumbpath: shortstring;

    k: LongInt;

begin

    thumbpath:= '/VideoTemp/' + RecPrefix;

    AddFileLog('Saving thumbnail ' + thumbpath);

    k:= max(max(cScreenWidth, cScreenHeight) div 400, 1); // here 400 is minimum size of thumbnail

    MakeScreenshot(thumbpath, k, 0);

    thumbnailSaved:= true;

end;

// copy file (free pascal doesn't have copy file function)

procedure CopyFile(src, dest: shortstring);

var inF, outF: file;

    buffer: array[0..1023] of byte;

    result: LongInt;

    i: integer;

begin

{$IOCHECKS OFF}

    result:= 0; // avoid compiler hint and warning

    for i:= 0 to 1023 do

        buffer[i]:= 0;

    Assign(inF, src);

    Reset(inF, 1);

    if IOResult <> 0 then

    begin

        AddFileLog('Error: Could not read from ' + src);

        exit;

    end;

    Assign(outF, dest);

    Rewrite(outF, 1);

    if IOResult <> 0 then

    begin

        AddFileLog('Error: Could not write to ' + dest);

        exit;

    end;

    repeat

        BlockRead(inF, buffer, 1024, result);

        BlockWrite(outF, buffer, result);

    until result < 1024;

{$IOCHECKS ON}

end;

procedure BeginPreRecording;

var format: word;

    filename: shortstring;

    frequency, channels: LongInt;

begin

    AddFileLog('BeginPreRecording');

    thumbnailSaved:= false;

    RecPrefix:= 'hw-' + FormatDateTime('YYYY-MM-DD_HH-mm-ss-z', Now());

    // If this video is recorded from demo executed directly (without frontend)

    // then we need to copy demo so that frontend will be able to find it later.

    if recordFileName <> '' then

    begin

        if GameType <> gmtDemo then // this is save and game demo is not recording, abort

            exit;

        CopyFile(recordFileName, UserPathPrefix + '/VideoTemp/' + RecPrefix + '.hwd');

    end;

    Mix_QuerySpec(@frequency, @format, @channels);

    AddFileLog('sound: frequency = ' + IntToStr(frequency) + ', format = ' + IntToStr(format) + ', channels = ' + IntToStr(channels));

    if format <> $8010 then

    begin

        // TODO: support any audio format

        AddFileLog('Error: Unexpected audio format ' + IntToStr(format));

        exit;

    end;

{$IOCHECKS OFF}

    // create sound file

    filename:= UserPathPrefix + '/VideoTemp/' + RecPrefix + '.sw';

    Assign(audioFile, filename);

    Rewrite(audioFile, 1);

    if IOResult <> 0 then

    begin

        AddFileLog('Error: Could not write to ' + filename);

        exit;

    end;

    // create file with camera positions

    filename:= UserPathPrefix + '/VideoTemp/' + RecPrefix + '.txtout';

    Assign(cameraFile, filename);

    Rewrite(cameraFile);

    if IOResult <> 0 then

    begin

        AddFileLog('Error: Could not write to ' + filename);

        exit;

    end;

    // save audio parameters in sound file

    BlockWrite(audioFile, frequency, 4);

    BlockWrite(audioFile, channels, 4);

{$IOCHECKS ON}

    // register callback for actual audio recording

    Mix_SetPostMix(@RecordPostMix, nil);

    startTime:= SDL_GetTicks();

    flagPrerecording:= true;

end;

procedure StopPreRecording;

begin

    AddFileLog('StopPreRecording');

    flagPrerecording:= false;

    // call SDL_LockAudio because RecordPostMix may be executing right now

    SDL_LockAudio();

    Close(audioFile);

    Close(cameraFile);

    Mix_SetPostMix(nil, nil);

    SDL_UnlockAudio();

    if not thumbnailSaved then

        SaveThumbnail();

end;

procedure SaveCameraPosition;

var frame: TFrame;

begin

    if (not thumbnailSaved) and (ScreenFade = sfNone) then

        SaveThumbnail();

    frame.realTicks:= SDL_GetTicks() - startTime;

    frame.gameTicks:= GameTicks;

    frame.CamX:= WorldDx;

    frame.CamY:= WorldDy - cScreenHeight div 2;

    frame.zoom:= zoom/cScreenWidth;

    BlockWrite(cameraFile, frame, 1);

end;

procedure initModule;

begin

    // we need to make sure these variables are initialized before the main loop

    // or the wrapper will keep the default values of preinit

    cScreenWidth:= max(cWindowedWidth, 640);

    cScreenHeight:= max(cWindowedHeight, 480);

end;

procedure freeModule;

begin

    if flagPrerecording then

        StopPreRecording();

end;

end.

{$ENDIF} // USE_VIDEO_RECORDING