/*
* yuvfade.c
* black-fade 2004 Mark Heath <mjpeg at silicontrip.org>
* will fade a yuv4 stream to black after a specified number of frames
*
* based on code:
* Copyright (C) 2002 Alfonso Garcia-Pati<F1>o Barbolani <barbolani at jazzfree.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; 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., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <stdio.h>
#include <sys/types.h>
#include <stdlib.h>
#include <unistd.h>
#include <signal.h>
#include "yuv4mpeg.h"
#include "mpegconsts.h"
#define YUVFPS_VERSION "0.1"
static void print_usage()
{
fprintf (stderr,
"usage: yuvfps -c Count -f fadeCount [-v -h]\n"
"yuvfade fades the last f frames of a yuv video stream read from stdin\n"
"\n"
"\t -c skip this number of frames\n"
"\t -f fade to black for this many frames\n"
"\t -v Verbosity degree : 0=quiet, 1=normal, 2=verbose/debug\n"
"\t -h print this help\n"
);
}
//
// Resamples the video stream coming from fdIn and writes it
// to fdOut.
// There are two variations of the same theme:
//
// Upsampling: frames are duplicated when needed
// Downsampling: frames from the original are skipped
//
// Parameters:
//
// fdIn,fdOut : File descriptors for reading and writing the stream
// inStream, outStream: stream handlers for the source and destination streams.
// It is assumed that they are correctly initialized from/to
// their respective file I/O streams with the desired sample rates.
//
// src_frame_rate, frame_rate: ratios for source and destination frame rate
// (note that this may not match the information contained
// in the stream itself due to command line options
// )
//
// In both cases a Bresenham - style algorithm is used.
//
static void resample( int fdIn
, y4m_stream_info_t *inStrInfo
, int fdOut
, y4m_stream_info_t *outStrInfo
, int after
, int count
)
{
y4m_frame_info_t in_frame ;
uint8_t *yuv_data[3] ;
int frame_data_size ;
int read_error_code ;
int write_error_code ;
int src_frame_counter ;
int w,h,x,y;
float mul,val;
// Allocate memory for the YUV channels
h = y4m_si_get_height(inStrInfo) ;
w = y4m_si_get_width(inStrInfo);
frame_data_size = w * h;
yuv_data[0] = (uint8_t *)malloc( frame_data_size );
yuv_data[1] = (uint8_t *)malloc( frame_data_size >> 2);
yuv_data[2] = (uint8_t *)malloc( frame_data_size >> 2);
if( !yuv_data[0] || !yuv_data[1] || !yuv_data[2] )
mjpeg_error_exit1 ("Could'nt allocate memory for the YUV4MPEG data!");
/* Initialize counters */
write_error_code = Y4M_OK ;
src_frame_counter = 0 ;
y4m_init_frame_info( &in_frame );
read_error_code = y4m_read_frame(fdIn,inStrInfo,&in_frame,yuv_data );
++src_frame_counter ;
while( Y4M_ERR_EOF != read_error_code && write_error_code == Y4M_OK ) {
if (src_frame_counter > after) {
// fade frame
mul = 1.0 * (after + count - src_frame_counter) / count;
if (mul < 0)
mul = 0;
for (y=0; y<h; y++)
for (x=0; x<w; x++)
{
val = (yuv_data[0][x+y*w] - 16) * mul + 16;
yuv_data[0][x+y*w] = val;
/* I think chroma fading needs to be started after luma fading */
if ( (mul * 1.5 < 1.0) && (!(y%2) && !(x%2)) )
{
val = (yuv_data[1][x/2+y/2*w/2] - 128) * 1.5 * mul + 128;
yuv_data[1][x/2+y/2*w/2] = val;
val = (yuv_data[2][x/2+y/2*w/2] - 128) * 1.5 * mul + 128;
yuv_data[2][x/2+y/2*w/2] = val;
}
}
}
write_error_code = y4m_write_frame( fdOut, outStrInfo, &in_frame, yuv_data );
++src_frame_counter ;
y4m_fini_frame_info( &in_frame );
y4m_init_frame_info( &in_frame );
read_error_code = y4m_read_frame(fdIn, inStrInfo,&in_frame,yuv_data );
}
// Clean-up regardless an error happened or not
y4m_fini_frame_info( &in_frame );
free( yuv_data[0] );
free( yuv_data[1] );
free( yuv_data[2] );
if( read_error_code != Y4M_ERR_EOF )
mjpeg_error_exit1 ("Error reading from input stream!");
if( write_error_code != Y4M_OK )
mjpeg_error_exit1 ("Error writing output stream!");
}
// *************************************************************************************
// MAIN
// *************************************************************************************
int main (int argc, char *argv[])
{
int verbose = LOG_ERROR ;
int count = 0 ;
int frames = 0;
int fdIn = 0 ;
int fdOut = 1 ;
y4m_stream_info_t in_streaminfo, out_streaminfo ;
y4m_ratio_t frame_rate, src_frame_rate ;
const static char *legal_flags = "f:c:v:h";
int c ;
while ((c = getopt (argc, argv, legal_flags)) != -1) {
switch (c) {
case 'v':
verbose = atoi (optarg);
if (verbose < 0 || verbose > 2)
mjpeg_error_exit1 ("Verbose level must be [0..2]");
break;
case 'c':
count = atoi (optarg);
break;
case 'f':
frames = atoi (optarg);
break;
case 'h':
case '?':
print_usage (argv);
return 0 ;
break;
}
}
// mjpeg tools global initialisations
mjpeg_default_handler_verbosity (verbose);
// Initialize input streams
y4m_init_stream_info (&in_streaminfo);
y4m_init_stream_info (&out_streaminfo);
// ***************************************************************
// Get video stream informations (size, framerate, interlacing, aspect ratio).
// The streaminfo structure is filled in
// ***************************************************************
// INPUT comes from stdin, we check for a correct file header
if (y4m_read_stream_header (fdIn, &in_streaminfo) != Y4M_OK)
mjpeg_error_exit1 ("Could'nt read YUV4MPEG header!");
// Prepare output stream
src_frame_rate = y4m_si_get_framerate( &in_streaminfo );
frame_rate = src_frame_rate ;
y4m_copy_stream_info( &out_streaminfo, &in_streaminfo );
// Information output
mjpeg_info ("yuvfade (version " YUVFPS_VERSION
") is a general black fade utility for yuv streams");
y4m_write_stream_header(fdOut,&out_streaminfo);
/* in that function we do all the important work */
resample( fdIn,&in_streaminfo, fdOut,&out_streaminfo,
count, frames );
y4m_fini_stream_info (&in_streaminfo);
y4m_fini_stream_info (&out_streaminfo);
return 0;
}
/*
* Local variables:
* tab-width: 8
* indent-tabs-mode: nil
* End:
*/