/* === S Y N F I G ========================================================= */
/*!	\file trgt_ffmpeg.cpp
**	\brief ppm Target Module
**
**	$Id$
**
**	\legal
**	Copyright (c) 2002-2005 Robert B. Quattlebaum Jr., Adrian Bentley
**	Copyright (c) 2007 Chris Moore
**	Copyright (c) 2010 Diego Barrios Romero
**
**	This package 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 package 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.
**	\endlegal
**
** === N O T E S ===========================================================
**
** ========================================================================= */

/* === H E A D E R S ======================================================= */

#ifdef USING_PCH
#	include "pch.h"
#else
#ifdef HAVE_CONFIG_H
#	include <config.h>
#endif

#include <synfig/localization.h>
#include <synfig/general.h>

#include <ETL/stringf>
#include "trgt_ffmpeg.h"
#include <cstdio>
#include <sys/types.h>
#if HAVE_SYS_WAIT_H
 #include <sys/wait.h>
#endif
#if HAVE_IO_H
 #include <io.h>
#endif
#if HAVE_PROCESS_H
 #include <process.h>
#endif
#if HAVE_FCNTL_H
 #include <fcntl.h>
#endif
#include <unistd.h>
#include <algorithm>
#include <functional>
#include <ETL/clock>

#endif

/* === M A C R O S ========================================================= */

using namespace synfig;
using namespace std;
using namespace etl;

#if defined(HAVE_FORK) && defined(HAVE_PIPE) && defined(HAVE_WAITPID)
 #define UNIX_PIPE_TO_PROCESSES
#else
 #define WIN32_PIPE_TO_PROCESSES
#endif

/* === G L O B A L S ======================================================= */

SYNFIG_TARGET_INIT(ffmpeg_trgt);
SYNFIG_TARGET_SET_NAME(ffmpeg_trgt,"ffmpeg");
SYNFIG_TARGET_SET_EXT(ffmpeg_trgt,"mpg");
SYNFIG_TARGET_SET_VERSION(ffmpeg_trgt,"0.1");
SYNFIG_TARGET_SET_CVS_ID(ffmpeg_trgt,"$Id$");

/* === M E T H O D S ======================================================= */

ffmpeg_trgt::ffmpeg_trgt(const char *Filename, const synfig::TargetParam &params):
	pid(-1),
	imagecount(0),
	multi_image(false),
	file(NULL),
	filename(Filename),
	buffer(NULL),
	color_buffer(NULL),
	bitrate()
{
	set_alpha_mode(TARGET_ALPHA_MODE_FILL);

	// Set default video codec and bitrate if they weren't given.
	if (params.video_codec == "none")
		video_codec = "mpeg1video";
	else
		video_codec = params.video_codec;

	if (params.bitrate == -1)
		bitrate = 200;
	else
		bitrate = params.bitrate;
}

ffmpeg_trgt::~ffmpeg_trgt()
{
	if(file)
	{
		etl::yield();
		sleep(1);
#if defined(WIN32_PIPE_TO_PROCESSES)
		pclose(file);
#elif defined(UNIX_PIPE_TO_PROCESSES)
		fclose(file);
		int status;
		waitpid(pid,&status,0);
#endif
	}
	file=NULL;
	delete [] buffer;
	delete [] color_buffer;
}

bool
ffmpeg_trgt::set_rend_desc(RendDesc *given_desc)
{
	//given_desc->set_pixel_format(PF_RGB);

	// Make sure that the width and height
	// are multiples of 8
	given_desc->set_w((given_desc->get_w()+4)/8*8);
	given_desc->set_h((given_desc->get_h()+4)/8*8);

	/*
	// Valid framerates:
	// 23.976, 24, 25, 29.97, 30, 50 ,59.94, 60
	float fps=given_desc->get_frame_rate();
	if(fps <24.0)
		given_desc->set_frame_rate(23.976);
	if(fps>=24.0 && fps <25.0)
		given_desc->set_frame_rate(24);
	if(fps>=25.0 && fps <29.97)
		given_desc->set_frame_rate(25);
	if(fps>=29.97 && fps <30.0)
		given_desc->set_frame_rate(29.97);
	if(fps>=29.97 && fps <30.0)
		given_desc->set_frame_rate(29.97);
	if(fps>=30.0 && fps <50.0)
		given_desc->set_frame_rate(30.0);
	if(fps>=50.0 && fps <59.94)
		given_desc->set_frame_rate(50);
	if(fps>=59.94)
		given_desc->set_frame_rate(59.94);
    */

	desc=*given_desc;

	return true;
}

bool
ffmpeg_trgt::init(ProgressCallback *cb=NULL)
{
	String ffmpeg_binary_path;
	std::list< String > binary_choices;
	binary_choices.push_back("ffmpeg");
	binary_choices.push_back("avconv");
	std::list< String >::iterator iter;
	for(iter=binary_choices.begin();iter!=binary_choices.end();iter++)
	{
		String binary_path;
#if defined(WIN32_PIPE_TO_PROCESSES)
		binary_path = synfig::get_binary_path("");
		if (binary_path != "")
			binary_path = etl::dirname(binary_path)+ETL_DIRECTORY_SEPARATOR;
		binary_path += *iter+".exe";
		if( access( binary_path.c_str(), F_OK ) != -1 ) {
			binary_path = "\"" + binary_path + "\"";
			ffmpeg_binary_path = binary_path;
			break;
		}
#else
		binary_path = *iter;
		
		String command;
		String result;
		command = "which "+binary_path;
		FILE* pipe = popen(command.c_str(), "r");
		if (!pipe) {
			continue;
		}
		char buffer[128];
		while(!feof(pipe)) {
			if(fgets(buffer, 128, pipe) != NULL)
					result += buffer;
		}
		pclose(pipe);
		synfig::info(strprintf("\"%s\" --> %s", command.c_str(), result.c_str()));
		if (result.substr(0,1) == "/" || result.substr(0,2) == "./" ){
			ffmpeg_binary_path = binary_path;
			break;
		}
#endif

	}
	if (ffmpeg_binary_path == "")
	{
		if (cb) cb->error(_("Error: No FFmpeg binary found.\n\nPlease install \"ffmpeg\" or \"avconv\" (libav-tools package)."));
		return false;
	}
	
	imagecount=desc.get_frame_start();
	if(desc.get_frame_end()-desc.get_frame_start()>0)
		multi_image=true;
	// this should avoid conflicts with locale settings
	synfig::ChangeLocale change_locale(LC_NUMERIC, "C");
	
	String video_codec_real;
	if (video_codec == "libx264-lossless")
		video_codec_real="libx264";
	else
		video_codec_real=video_codec;
	
	std::vector<String> vargs;
	vargs.push_back(ffmpeg_binary_path);
	vargs.push_back("-f");
	vargs.push_back("image2pipe");
	vargs.push_back("-vcodec");
	vargs.push_back("ppm");
	vargs.push_back("-r");
	vargs.push_back(strprintf("%f", desc.get_frame_rate()));
	vargs.push_back("-i");
	vargs.push_back("pipe:");
	vargs.push_back("-an");
	vargs.push_back("-metadata");
	vargs.push_back(strprintf("title=\"%s\"", get_canvas()->get_name().c_str()));
	vargs.push_back("-vcodec");
	vargs.push_back(video_codec_real);
	vargs.push_back("-b:v");
	vargs.push_back(strprintf("%ik", bitrate));
	if (video_codec == "libx264-lossless") {
		vargs.push_back("-tune");
		vargs.push_back("fastdecode");
		vargs.push_back("-pix_fmt");
		vargs.push_back("yuv420p");
		vargs.push_back("-qp");
		vargs.push_back("0");
	}
	vargs.push_back("-y");
	// We need "--" to separate filename from arguments (for the case when filename starts with "-")
	if ( filename.substr(0,1) == "-" )
		vargs.push_back("--"); 

#if defined(WIN32_PIPE_TO_PROCESSES)
	vargs.push_back("\"" + filename + "\"");
#else
	vargs.push_back(filename);
#endif

#if defined(WIN32_PIPE_TO_PROCESSES)

	String command;
	for( std::vector<std::string>::size_type i = 0; i != vargs.size(); i++ )
	{
		command+=" "+vargs[i];
	}
	command+="\n";

	// This covers the dumb cmd.exe behavior.
	// See: http://eli.thegreenplace.net/2011/01/28/on-spaces-in-the-paths-of-programs-and-files-on-windows/
	command = "\"" + command + "\"";

	file=popen(command.c_str(),POPEN_BINARY_WRITE_TYPE);

#elif defined(UNIX_PIPE_TO_PROCESSES)

	int p[2];

	if (pipe(p)) {
		synfig::error(_("Unable to open pipe to ffmpeg (no pipe)"));
		return false;
	};

	pid = fork();

	if (pid == -1) {
		synfig::error(_("Unable to open pipe to ffmpeg (pid == -1)"));
		return false;
	}

	if (pid == 0){
		// Child process
		// Close pipeout, not needed
		close(p[1]);
		// Dup pipeout to stdin
		if( dup2( p[0], STDIN_FILENO ) == -1 ){
			synfig::error(_("Unable to open pipe to ffmpeg (dup2( p[0], STDIN_FILENO ) == -1)"));
			return false;
		}
		// Close the unneeded pipeout
		close(p[0]);
		
		char *args[vargs.size()+1];
		size_t idx = 0;
		for( std::vector<std::string>::size_type i = 0; i != vargs.size(); i++ )
		{
			//std::vector<char> writable(vargs[i].begin(), vargs[i].end());
			//writable.push_back('\0');
			//args[idx++] = &writable[0];
			//args[idx++] = strdup(vargs[i].c_str());
			args[idx++] = &vargs[i][0];
			//synfig::info(&vargs[i][0]);
		}
		args[idx++] = (char *)NULL;
		
		execvp(ffmpeg_binary_path.c_str(), args);

		// We should never reach here unless the exec failed
		synfig::error(_("Unable to open pipe to ffmpeg (exec failed)"));
		return false;
	} else {
		// Parent process
		// Close pipein, not needed
		close(p[0]);
		// Save pipeout to file handle, will write to it later
		file = fdopen(p[1], "wb");
	}

#else
	#error There are no known APIs for creating child processes
#endif

	// etl::yield();

	if(!file)
	{
		synfig::error(_("Unable to open pipe to ffmpeg (no file)"));
		return false;
	}

	return true;
}

void
ffmpeg_trgt::end_frame()
{
	//fprintf(file, " ");
	fflush(file);
	imagecount++;
}

bool
ffmpeg_trgt::start_frame(synfig::ProgressCallback */*callback*/)
{
	int w=desc.get_w(),h=desc.get_h();

	if(!file)
		return false;

	fprintf(file, "P6\n");
	fprintf(file, "%d %d\n", w, h);
	fprintf(file, "%d\n", 255);

	delete [] buffer;
	buffer=new unsigned char[3*w];
	delete [] color_buffer;
	color_buffer=new Color[w];

	return true;
}

Color *
ffmpeg_trgt::start_scanline(int /*scanline*/)
{
	return color_buffer;
}

bool
ffmpeg_trgt::end_scanline()
{
	if(!file)
		return false;

	color_to_pixelformat(buffer, color_buffer, PF_RGB, 0, desc.get_w());

	if(!fwrite(buffer,1,desc.get_w()*3,file))
		return false;

	return true;
}