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|
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <math.h>
#include <signal.h>
#include "yuv4mpeg.h"
#include "mjpeg_types.h"
#include "yuvscaler.h"
// From outide MAIN : global variables
extern unsigned int input_width;
extern unsigned int output_width;
// Downscaling ratios
extern unsigned int input_height_slice;
extern unsigned int output_height_slice;
extern unsigned int input_width_slice;
extern unsigned int output_width_slice;
extern int interlaced;
extern unsigned int output_active_width;
extern unsigned int output_active_height;
extern int line_switching;
extern unsigned int specific;
extern unsigned int out_nb_col_slice, out_nb_line_slice;
extern uint8_t *divide;
// From inside MAIN function
// *************************************************************************************
int
average_coeff (unsigned int input_length, unsigned int output_length,
unsigned int *coeff)
{
// This function calculates multiplicative coeeficients to average an input (vector of) length
// input_length into an output (vector of) length output_length;
// We sequentially store the number-of-non-zero-coefficients, followed by the coefficients
// themselvesc, and that, output_length time
int last_coeff = 0, remaining_coeff, still_to_go = 0, in, out, non_zero =
0, nb;
unsigned int *non_zero_p = NULL;
unsigned int *pointer;
if ((output_length > input_length) || (input_length == 0)
|| (output_length == 0) || (coeff == NULL))
{
mjpeg_error ("Function average_coeff : arguments are wrong");
mjpeg_error ("input length = %d, output length = %d, input = %p",
input_length, output_length, coeff);
exit (1);
}
#ifdef DEBUG
mjpeg_debug
("Function average_coeff : input length = %d, output length = %d, input = %p",
input_length, output_length, coeff);
#endif
pointer = coeff;
if (output_length == 1)
{
*pointer = input_length;
pointer++;
for (in = 0; in < input_length; in++)
{
*pointer = 1;
pointer++;
}
}
else
{
for (in = 0; in < output_length; in++)
{
non_zero = 0;
non_zero_p = pointer;
pointer++;
still_to_go = input_length;
if (last_coeff > 0)
{
remaining_coeff = output_length - last_coeff;
*pointer = remaining_coeff;
pointer++;
non_zero++;
still_to_go -= remaining_coeff;
}
nb = (still_to_go / output_length);
#ifdef DEBUG
mjpeg_debug ("in=%d,nb=%d,stgo=%d ol=%d", in, nb, still_to_go,
output_length);
#endif
for (out = 0; out < nb; out++)
{
*pointer = output_length;
pointer++;
}
still_to_go -= nb * output_length;
non_zero += nb;
if ((last_coeff = still_to_go) != 0)
{
*pointer = last_coeff;
#ifdef DEBUG
mjpeg_debug ("non_zero=%d,last_coeff=%d", non_zero,
last_coeff);
#endif
pointer++; // now pointer points onto the next number-of-non_zero-coefficients
non_zero++;
*non_zero_p = non_zero;
}
else
{
if (in != output_length - 1)
{
mjpeg_error
("There is a common divider between %d and %d\n This should not be the case",
input_length, output_length);
exit (1);
}
}
}
*non_zero_p = non_zero;
if (still_to_go != 0)
{
mjpeg_error
("Function average_coeff : calculus doesn't stop right : %d",
still_to_go);
}
}
#ifdef DEBUG
if (verbose == 2)
{
int i, j;
for (i = 0; i < output_length; i++)
{
mjpeg_debug ("line=%d", i);
non_zero = *coeff;
coeff++;
mjpeg_debug (" ");
for (j = 0; j < non_zero; j++)
{
fprintf (stderr, "%d : %d ", j, *coeff);
coeff++;
}
fprintf (stderr, "\n");
}
}
#endif
return (0);
}
// *************************************************************************************
// *************************************************************************************
int
average (uint8_t * input, uint8_t * output, unsigned int *height_coeff,
unsigned int *width_coeff, unsigned int half)
{
// This function average an input matrix of name input and of size local_input_width*(local_out_nb_line_slice*input_height_slice)
// into an output matrix of name output and of size local_output_width*(local_out_nb_line_slice+output_height_slice)
// input and output images are interleaved
// if half==1 => we are dealing with an U or V component => height and width are / 2 => for speed sake, we use >>half
unsigned int local_input_width = input_width >> half;
unsigned int local_output_width = output_width >> half;
unsigned int local_out_nb_col_slice = out_nb_col_slice >> half;
unsigned int local_out_nb_line_slice = out_nb_line_slice >> half;
uint8_t *input_line_p[input_height_slice];
uint8_t *output_line_p[output_height_slice];
unsigned int *H_var, *W_var, *H, *W;
uint8_t *u_c_p;
int j, nb_H, nb_W, in_line, first_line, out_line;
int out_col_slice, out_col;
int out_line_slice;
int current_line, last_line;
unsigned long int value = 0;
//Init
mjpeg_debug ("Start of average");
//End of INIT
if (interlaced == Y4M_ILACE_NONE)
{
mjpeg_debug ("Non-interlaced downscaling");
// output frames are not interlaced => averaging will generate output lines is growing order,
// output_height_slice lines per output_height_slice lines.
// More important is the following question :
// is input frames CONTENT interlaced or not (input frames are then said progressives). If content is interlaced (odd lines corresponds to time t
// and even lines to another time t+dt with dt=1/(2*frame_rate)), then input frames should be DEINTERLACED prior to averaging
// So, if input frames are interlaced, we will suppose they are progressives
// TO BE PROGRAMMED, cf. FlaskMPEG
for (out_line_slice = 0; out_line_slice < local_out_nb_line_slice;
out_line_slice++)
{
u_c_p = input +
out_line_slice * input_height_slice * local_input_width;
for (in_line = 0; in_line < input_height_slice; in_line++)
{
input_line_p[in_line] = u_c_p;
u_c_p += local_input_width;
}
u_c_p =
output +
out_line_slice * output_height_slice * local_output_width;
for (out_line = 0; out_line < output_height_slice; out_line++)
{
output_line_p[out_line] = u_c_p;
u_c_p += local_output_width;
}
for (out_col_slice = 0; out_col_slice < local_out_nb_col_slice;
out_col_slice++)
{
H = height_coeff;
first_line = 0;
for (out_line = 0; out_line < output_height_slice; out_line++)
{
nb_H = *H;
W = width_coeff;
for (out_col = 0; out_col < output_width_slice; out_col++)
{
H_var = H + 1;
nb_W = *W;
value = 0;
last_line = first_line + nb_H;
for (current_line = first_line;
current_line < last_line; current_line++)
{
W_var = W + 1;
// we average nb_W columns of input : we increment input_line_p[current_line] and W_var each time, except for the last value where
// input_line_p[current_line] and W_var do not need to be incremented, but H_var does
for (j = 0; j < nb_W - 1; j++)
value +=
(*H_var) * (*W_var++) *
(*input_line_p[current_line]++);
value +=
(*H_var++) * (*W_var) *
(*input_line_p[current_line]);
}
// Straiforward implementation is
// *(output_line_p[out_line]++)=value/diviseur;
// round_off_error=value%diviseur;
// Here, we speed up things but using the pretabulated nearest integral parts
*(output_line_p[out_line]++) = divide[value];
W += nb_W + 1;
}
H += nb_H + 1;
first_line += nb_H - 1;
input_line_p[first_line] -= input_width_slice - 1;
// If last line of input is to be reused in next loop,
// make the pointer points at the correct place
}
input_line_p[first_line] += input_width_slice - 1;
for (in_line = 0; in_line < input_height_slice; in_line++)
input_line_p[in_line]++;
}
}
}
else
{
// output frames are interlaced, line numbers gioes from 0 to n-1.
// Therefore, downscaling is done between odd lines, then between even lines, but we do not mix odd and even lines.
// So, we have to calculate the even and odd part of out_line_slice.
// If the odd part is naturally out_line_slice % 2, the even part is (out_line_slice/2)*2. For speed reason,
// the even part will be xritten as out_line_slice & ~(unsigned int) 1
mjpeg_debug ("Interlaced downscaling");
for (out_line_slice = 0; out_line_slice < local_out_nb_line_slice;
out_line_slice++)
{
u_c_p =
input +
((out_line_slice & ~(unsigned int) 1) * input_height_slice +
out_line_slice % 2) * local_input_width;
for (in_line = 0; in_line < input_height_slice; in_line++)
{
input_line_p[in_line] = u_c_p;
u_c_p += 2 * local_input_width;
}
u_c_p =
output +
((out_line_slice & ~(unsigned int) 1) * output_height_slice +
out_line_slice % 2) * local_output_width;
for (out_line = 0; out_line < output_height_slice; out_line++)
{
output_line_p[out_line] = u_c_p;
u_c_p += 2 * local_output_width;
}
for (out_col_slice = 0; out_col_slice < local_out_nb_col_slice;
out_col_slice++)
{
H = height_coeff;
first_line = 0;
for (out_line = 0; out_line < output_height_slice; out_line++)
{
nb_H = *H;
W = width_coeff;
for (out_col = 0; out_col < output_width_slice; out_col++)
{
H_var = H + 1;
nb_W = *W;
value = 0;
last_line = first_line + nb_H;
for (current_line = first_line;
current_line < last_line; current_line++)
{
W_var = W + 1;
// we average nb_W columns of input : we increment input_line_p[current_line] and W_var each time, except for the last value where
// input_line_p[current_line] and W_var do not need to be incremented, but H_var does
for (j = 0; j < nb_W - 1; j++)
value +=
(*H_var) * (*W_var++) *
(*input_line_p[current_line]++);
value +=
(*H_var++) * (*W_var) *
(*input_line_p[current_line]);
}
// Straiforward implementation is
// *(output_line_p[out_line]++)=value/diviseur;
// round_off_error=value%diviseur;
// Here, we speed up things but using the pretabulated integral parts
*(output_line_p[out_line]++) = divide[value];
W += nb_W + 1;
}
H += nb_H + 1;
first_line += nb_H - 1;
input_line_p[first_line] -= input_width_slice - 1;
// If last line of input is to be reused in next loop,
// make the pointer points at the correct place
}
input_line_p[first_line] += input_width_slice - 1;
for (in_line = 0; in_line < input_height_slice; in_line++)
input_line_p[in_line]++;
}
}
}
mjpeg_debug ("End of average");
return (0);
}
// *************************************************************************************
// *************************************************************************************
int
average_specific (uint8_t * input, uint8_t * output,
unsigned int *height_coeff, unsigned int *width_coeff,
unsigned int half)
{
// This function gathers code that are speed enhanced due to specific downscaling ratios
unsigned int line_index;
unsigned int local_output_active_height = output_active_height >> half;
unsigned int local_input_width = input_width >> half;
unsigned int local_output_width = output_width >> half;
unsigned int local_output_active_width = output_active_width >> half;
unsigned int local_out_nb_col_slice = out_nb_col_slice >> half;
unsigned int local_out_nb_line_slice = out_nb_line_slice >> half;
unsigned int number,in_line_offset,out_line_offset;
// specific==1, 4
uint8_t temp_uint8_t;
uint8_t *in_line_p;
uint8_t *out_line_p;
unsigned int *W_var, *W;
int j, nb_W;
unsigned int out_col_slice, out_col;
int treatment = 0;
unsigned long int value = 0, value1 = 0, value2 = 0, value3 = 0;
// Specific==2
uint8_t *in_first_line_p, *in_second_line_p;
unsigned int out_line;
// specific=3
unsigned char *u_c_p;
unsigned int in_line;
uint8_t *input_line_p[input_height_slice];
// specific=5
unsigned int *H_var, *H;
unsigned int nb_H, first_line, last_line, current_line;
unsigned int out_line_slice;
uint8_t *output_line_p[output_height_slice];
//Init
mjpeg_debug ("Start of average_specific %u", specific);
//End of INIT
if (specific == 1)
{
treatment = 1;
mjpeg_debug ("Non interlaced and/or interlaced treatment");
// We just take the average along the width, not the height, line per line
// Infered from average, with input_height_slice=output_height_slice=1;
for (line_index = 0; line_index < local_output_active_height;
line_index++)
{
in_line_p = input + line_index * local_input_width;
out_line_p = output + line_index * local_output_width;
for (out_col_slice = 0; out_col_slice < local_out_nb_col_slice;
out_col_slice++)
{
W = width_coeff;
for (out_col = 0; out_col < output_width_slice; out_col++)
{
nb_W = *W;
value = 0;
W_var = W + 1;
for (j = 0; j < nb_W - 1; j++)
value += (*W_var++) * (*in_line_p++);
value += (*W_var) * (*in_line_p);
*(out_line_p++) = divide[value];
W += nb_W + 1;
}
in_line_p++;
}
}
}
if (specific == 2)
{
treatment = 2;
// SPECIAL FAST Full_size to VCD downscaling : 2to1 for width and height
// Since 2 to 1 height dowscaling, no need for line switching
// Drawback: slight distortion on width
if (interlaced == Y4M_ILACE_NONE)
{
mjpeg_debug ("Non-interlaced downscaling");
for (out_line = 0; out_line < local_output_active_height;
out_line++)
{
in_first_line_p = input + out_line * (local_input_width << 1);
in_second_line_p = in_first_line_p + local_input_width;
out_line_p = output + out_line * local_output_width;
for (out_col = 0; out_col < local_output_active_width;
out_col++)
{
// Division of integers is always made by default. This results in a systematic drift towards smaller values.
// What we really need,
// is a division that takes the nearest integer.
// So, we add 1/2 of the divider to the value to be divided
// *(out_line_p++) =
// (2 + *(in_first_line_p) + *(in_first_line_p + 1) +
// *(in_second_line_p) + *(in_second_line_p + 1)) >> 2;
*(out_line_p++) =
divide[*(in_first_line_p) + *(in_first_line_p + 1) +
*(in_second_line_p) + *(in_second_line_p + 1)];
in_first_line_p += 2;
in_second_line_p += 2;
}
}
}
else
{
mjpeg_debug ("Interlaced downscaling");
for (line_index = 0; line_index < local_output_active_height;
line_index++)
{
in_first_line_p =
input + (((line_index & ~(unsigned int) 1) << 1) +
(line_index % 2)) * local_input_width;
in_second_line_p = in_first_line_p + (local_input_width << 1);
out_line_p = output + line_index * local_output_width;
for (out_col = 0; out_col < local_output_active_width;
out_col++)
{
/* *(out_line_p++) =
(2 + *(in_first_line_p) + *(in_first_line_p + 1) +
*(in_second_line_p) + *(in_second_line_p + 1)) >> 2;
*/ *(out_line_p++) = divide[*(in_first_line_p) + *(in_first_line_p + 1) +
*
(in_second_line_p)
+
*
(in_second_line_p
+
1)];
in_first_line_p += 2;
in_second_line_p += 2;
}
}
}
}
if (specific == 3)
{
treatment = 3;
// input_height_slice=2, output_height_slice=1 => input lines will be summed together.
// infered from average with output_height_slice=1 and explicity writting of the for(in_line=0;in_line<input_height_slice;in_line++)
// Special VCD downscaling without width distortion
if (interlaced == Y4M_ILACE_NONE)
{
mjpeg_debug ("Non-interlaced downscaling");
for (out_line = 0; out_line < local_output_active_height;
out_line++)
{
input_line_p[0] =
input + out_line * input_height_slice * local_input_width;
input_line_p[1] = input_line_p[0] + local_input_width;
out_line_p = output + out_line * local_output_width;
for (out_col_slice = 0;
out_col_slice < local_out_nb_col_slice; out_col_slice++)
{
W = width_coeff;
for (out_col = 0; out_col < output_width_slice; out_col++)
{
nb_W = *W;
value = 0;
W_var = W + 1;
for (j = 0; j < nb_W - 1; j++)
value +=
(*W_var++) * ((*input_line_p[0]++) +
(*input_line_p[1]++));
value +=
(*W_var) * (*input_line_p[0] + *input_line_p[1]);
*(out_line_p++) = divide[value];
W += nb_W + 1;
}
input_line_p[0]++;
input_line_p[1]++;
}
}
}
else
{
mjpeg_debug ("Interlaced downscaling");
for (line_index = 0; line_index < local_output_active_height;
line_index++)
{
input_line_p[0] =
input +
(input_height_slice * (line_index & ~(unsigned int) 1) +
line_index % 2) * local_input_width;
input_line_p[1] = input_line_p[0] + 2 * local_input_width;
out_line_p = output + line_index * local_output_width;
for (out_col_slice = 0;
out_col_slice < (out_nb_col_slice >> half);
out_col_slice++)
{
W = width_coeff;
for (out_col = 0; out_col < output_width_slice; out_col++)
{
nb_W = *W;
value = 0;
W_var = W + 1;
for (j = 0; j < nb_W - 1; j++)
value +=
(*W_var++) * ((*input_line_p[0]++) +
(*input_line_p[1]++));
value +=
(*W_var) * (*input_line_p[0] + *input_line_p[1]);
*(out_line_p++) = divide[value];
W += nb_W + 1;
}
input_line_p[0]++;
input_line_p[1]++;
}
}
}
}
if (specific == 4)
{
// just a copy: we copy line per line (warning! these lines are output_width long BUT we only copy output_active_width length of them)
treatment = 4;
mjpeg_debug ("Non-interlaced or interlaced downscaling");
for (line_index = 0; line_index < local_output_active_height;
line_index++)
// ;
memcpy (output + line_index * local_output_width,
input + line_index * local_input_width,
local_output_active_width);
}
if (specific == 5)
{
// We downscale only lines along the height, not the width
treatment = 5;
if (interlaced == Y4M_ILACE_NONE)
{
mjpeg_debug ("Non-interlaced downscaling");
for (out_line_slice = 0; out_line_slice < local_out_nb_line_slice;
out_line_slice++)
{
for (in_line = 0; in_line < input_height_slice; in_line++)
{
number = out_line_slice * input_height_slice + in_line;
input_line_p[in_line] = input + number * local_input_width;
}
u_c_p =
output +
out_line_slice * output_height_slice * local_output_width;
for (out_line = 0; out_line < output_height_slice; out_line++)
{
output_line_p[out_line] = u_c_p;
u_c_p += local_output_width;
}
for (out_col = 0; out_col < local_output_active_width;
out_col++)
{
H = height_coeff;
first_line = 0;
for (out_line = 0; out_line < output_height_slice;
out_line++)
{
nb_H = *H;
H_var = H + 1;
value = 0;
last_line = first_line + nb_H;
for (current_line = first_line;
current_line < last_line; current_line++)
value += (*H_var++) * (*input_line_p[current_line]);
*(output_line_p[out_line]++) = divide[value];
H += nb_H + 1;
first_line += nb_H - 1;
}
for (in_line = 0; in_line < input_height_slice; in_line++)
input_line_p[in_line]++;
}
}
}
else
{
mjpeg_debug ("Interlaced downscaling");
for (out_line_slice = 0; out_line_slice < local_out_nb_line_slice;
out_line_slice++)
{
u_c_p =
input +
((out_line_slice & ~(unsigned int) 1) * input_height_slice +
out_line_slice % 2) * local_input_width;
for (in_line = 0; in_line < input_height_slice; in_line++)
{
input_line_p[in_line] = u_c_p;
u_c_p += 2 * local_input_width;
}
u_c_p =
output +
((out_line_slice & ~(unsigned int) 1) *
output_height_slice +
out_line_slice % 2) * local_output_width;
for (out_line = 0; out_line < output_height_slice; out_line++)
{
output_line_p[out_line] = u_c_p;
u_c_p += 2 * local_output_width;
}
for (out_col = 0; out_col < local_output_active_width;
out_col++)
{
H = height_coeff;
first_line = 0;
for (out_line = 0; out_line < output_height_slice;
out_line++)
{
nb_H = *H;
H_var = H + 1;
value = 0;
last_line = first_line + nb_H;
for (current_line = first_line;
current_line < last_line; current_line++)
value += (*H_var++) * (*input_line_p[current_line]);
*(output_line_p[out_line]++) = divide[value];
H += nb_H + 1;
first_line += nb_H - 1;
}
for (in_line = 0; in_line < input_height_slice; in_line++)
input_line_p[in_line]++;
}
}
}
}
if (specific == 6)
{
// Dedicated SVCD: we downscale 3 for 2 on width, and 1 to 1 on height. Infered from specific=1
// For width, W points are "2 2 1 2 1 2" => we can explicitely write down the calculs of value
treatment = 6;
mjpeg_debug ("Non interlaced and/or interlaced treatment");
in_line_offset = local_input_width - local_out_nb_col_slice * 3;
out_line_offset = local_output_width - local_out_nb_col_slice * 2;
in_line_p = input;
out_line_p = output;
for (line_index = 0; line_index < local_output_active_height;
line_index++)
{
// in_line_p = input + line_index * local_input_width;
// out_line_p = output + line_index * local_output_width;
for (out_col_slice = 0; out_col_slice < local_out_nb_col_slice;
out_col_slice++)
{
temp_uint8_t = in_line_p[1];
// *(out_line_p++) = divide[((*in_line_p) << 1) + temp_uint8_t];
*(out_line_p++) = (((*in_line_p) << 1) + temp_uint8_t + 1) / 3;
in_line_p += 2;
// *(out_line_p++) = divide[temp_uint8_t + ((*in_line_p++) << 1)];
*(out_line_p++) = (temp_uint8_t + ((*in_line_p++) << 1) + 1) / 3;
}
in_line_p += in_line_offset;
out_line_p += out_line_offset;
}
}
if (specific == 7)
{
// Dedicated to WIDE2STD alone downscaling: 4 to 3 on height, width not downscaled
// For the height, H is equal to 2 3 1 2 2 2 2 1 3
// Infered from specific=5
treatment = 7;
if (interlaced == Y4M_ILACE_NONE)
{
mjpeg_debug ("Non-interlaced downscaling");
for (out_line_slice = 0; out_line_slice < local_out_nb_line_slice;
out_line_slice++)
{
input_line_p[0] =
input + (4 * out_line_slice + 0) * local_input_width;
input_line_p[1] =
input + (4 * out_line_slice + 1) * local_input_width;
input_line_p[2] =
input + (4 * out_line_slice + 2) * local_input_width;
input_line_p[3] =
input + (4 * out_line_slice + 3) * local_input_width;
output_line_p[0] =
output + 3 * out_line_slice * local_output_width;
output_line_p[1] = output_line_p[0] + local_output_width;
output_line_p[2] = output_line_p[1] + local_output_width;
for (out_col = 0; out_col < local_output_active_width;
out_col++)
{
*(output_line_p[0]++) =
divide[3 * (*input_line_p[0]++) + (*input_line_p[1])];
*(output_line_p[1]++) =
divide[2 * (*input_line_p[1]++) + 2 * (*input_line_p[2])];
*(output_line_p[2]++) =
divide[(*input_line_p[2]++) + 3 * (*input_line_p[3]++)];
}
}
}
else
{
mjpeg_debug ("Interlaced downscaling");
for (out_line_slice = 0; out_line_slice < local_out_nb_line_slice;
out_line_slice++)
{
u_c_p =
input +
((out_line_slice & ~(unsigned int) 1) * input_height_slice +
(out_line_slice % 2)) * local_input_width;
for (in_line = 0; in_line < input_height_slice; in_line++)
{
input_line_p[in_line] = u_c_p;
u_c_p += 2 * local_input_width;
}
u_c_p =
output +
((out_line_slice & ~(unsigned int) 1) *
output_height_slice +
(out_line_slice % 2)) * local_output_width;
for (out_line = 0; out_line < output_height_slice; out_line++)
{
output_line_p[out_line] = u_c_p;
u_c_p += 2 * local_output_width;
}
for (out_col = 0; out_col < local_output_active_width;
out_col++)
{
*(output_line_p[0]++) =
divide[3 * (*input_line_p[0]++) + (*input_line_p[1])];
*(output_line_p[1]++) =
divide[2 * (*input_line_p[1]++) + 2 * (*input_line_p[2])];
*(output_line_p[2]++) =
divide[(*input_line_p[2]++) + 3 * (*input_line_p[3]++)];
}
}
}
}
if (specific == 8)
{
// Special FASTWIDE2VCD mode: 2 to 1 for width, and 8 to 3 for height
// *8 is replaced by <<3 and 2* by <<1
// Drawback: slight distortion on width
// Coefficient for horizontal downscaling : (3,3,2), (1,3,3,1), (2,3,3)
treatment = 8;
if (interlaced == Y4M_ILACE_NONE)
{
mjpeg_debug ("Non-interlaced downscaling");
for (out_line_slice = 0; out_line_slice < local_out_nb_line_slice;
out_line_slice++)
{
input_line_p[0] =
input + (8 * out_line_slice + 0) * local_input_width;
input_line_p[1] =
input + (8 * out_line_slice + 1) * local_input_width;
input_line_p[2] =
input + (8 * out_line_slice + 2) * local_input_width;
input_line_p[3] =
input + (8 * out_line_slice + 3) * local_input_width;
input_line_p[4] =
input + (8 * out_line_slice + 4) * local_input_width;
input_line_p[5] =
input + (8 * out_line_slice + 5) * local_input_width;
input_line_p[6] =
input + (8 * out_line_slice + 6) * local_input_width;
input_line_p[7] =
input + (8 * out_line_slice + 7) * local_input_width;
output_line_p[0] =
output + out_line_slice * 3 * local_output_width;
output_line_p[1] = output_line_p[0] + local_output_width;
output_line_p[2] = output_line_p[1] + local_output_width;
for (out_col = 0; out_col < local_output_active_width;
out_col++)
{
*(output_line_p[0]++) =
divide[3 * (*input_line_p[0] + (*input_line_p[0] + 1)) +
3 * (*input_line_p[1] + (*input_line_p[1] + 1)) +
2 * (*input_line_p[2] + (*input_line_p[2] + 1))];
input_line_p[0] += 2;
input_line_p[1] += 2;
*(output_line_p[1]++) = divide[(*input_line_p[2] +
(*input_line_p[2] + 1)) +
3 * (*input_line_p[3] +
(*input_line_p[3] +
1)) +
3 * (*input_line_p[4] +
(*input_line_p[4] +
1)) +
(*input_line_p[5] +
(*input_line_p[5] + 1))];
input_line_p[2] += 2;
input_line_p[3] += 2;
input_line_p[4] += 2;
*(output_line_p[2]++) =
divide[2 * (*input_line_p[5] + (*input_line_p[5] + 1)) +
3 * (*input_line_p[6] + (*input_line_p[6] + 1)) +
3 * (*input_line_p[7] + (*input_line_p[7] + 1))];
input_line_p[5] += 2;
input_line_p[6] += 2;
input_line_p[7] += 2;
}
}
}
else
{
mjpeg_debug ("Interlaced downscaling");
for (out_line_slice = 0; out_line_slice < local_out_nb_line_slice;
out_line_slice++)
{
input_line_p[0] =
input + (((out_line_slice & ~(unsigned int) 1) << 3) +
(out_line_slice % 2)) * local_input_width;
input_line_p[1] = input_line_p[0] + (local_input_width << 1);
input_line_p[2] = input_line_p[1] + (local_input_width << 1);
input_line_p[3] = input_line_p[2] + (local_input_width << 1);
input_line_p[4] = input_line_p[3] + (local_input_width << 1);
input_line_p[5] = input_line_p[4] + (local_input_width << 1);
input_line_p[6] = input_line_p[5] + (local_input_width << 1);
input_line_p[7] = input_line_p[6] + (local_input_width << 1);
output_line_p[0] =
output + ((out_line_slice & ~(unsigned int) 1) * 3 +
(out_line_slice % 2)) * local_output_width;
output_line_p[1] = output_line_p[0] + (local_output_width << 1);
output_line_p[2] = output_line_p[1] + (local_output_width << 1);
for (out_col = 0; out_col < local_output_active_width;
out_col++)
{
*(output_line_p[0]++) =
divide[3 * (*input_line_p[0] + (*input_line_p[0] + 1)) +
3 * (*input_line_p[1] + (*input_line_p[1] + 1)) +
2 * (*input_line_p[2] + (*input_line_p[2] + 1))];
input_line_p[0] += 2;
input_line_p[1] += 2;
*(output_line_p[1]++) = divide[(*input_line_p[2] +
(*input_line_p[2] + 1)) +
3 * (*input_line_p[3] +
(*input_line_p[3] +
1)) +
3 * (*input_line_p[4] +
(*input_line_p[4] +
1)) +
(*input_line_p[5] +
(*input_line_p[5] + 1))];
input_line_p[2] += 2;
input_line_p[3] += 2;
input_line_p[4] += 2;
*(output_line_p[2]++) =
divide[2 * (*input_line_p[5] + (*input_line_p[5] + 1)) +
3 * (*input_line_p[6] + (*input_line_p[6] + 1)) +
3 * (*input_line_p[7] + (*input_line_p[7] + 1))];
input_line_p[5] += 2;
input_line_p[6] += 2;
input_line_p[7] += 2;
}
}
}
}
if (specific == 9)
{
// Special WIDE2VCD, on height : 8->3
treatment = 9;
if (interlaced == Y4M_ILACE_NONE)
{
mjpeg_debug ("Non-interlaced downscaling");
// input frames are not interlaced, as are output frames.
// So, we average input_height_slice following lines into output_height_slice lines
for (out_line_slice = 0; out_line_slice < local_out_nb_line_slice;
out_line_slice++)
{
for (in_line = 0; in_line < input_height_slice; in_line++)
{
number = out_line_slice * input_height_slice + in_line;
input_line_p[in_line] = input + number * local_input_width;
}
u_c_p =
output +
out_line_slice * output_height_slice * local_output_width;
for (out_line = 0; out_line < output_height_slice; out_line++)
{
output_line_p[out_line] = u_c_p;
u_c_p += local_output_width;
}
for (out_col_slice = 0;
out_col_slice < local_out_nb_col_slice; out_col_slice++)
{
W = width_coeff;
for (out_col = 0; out_col < output_width_slice; out_col++)
{
nb_W = *W;
value1 = value2 = value3 = 0;
W_var = W + 1;
for (j = 0; j < nb_W - 1; j++)
{
value1 +=
(*W_var) * (3 * (*input_line_p[0]++) +
3 * (*input_line_p[1]++) +
2 * (*input_line_p[2]));
value2 +=
(*W_var) * ((*input_line_p[2]++) +
3 * (*input_line_p[3]++) +
3 * (*input_line_p[4]++) +
(*input_line_p[5]));
value3 +=
(*W_var++) * (2 * (*input_line_p[5]++) +
3 * (*input_line_p[6]++) +
3 * (*input_line_p[7]++));
}
value1 +=
(*W_var) * (3 * (*input_line_p[0]) +
3 * (*input_line_p[1]) +
2 * (*input_line_p[2]));
value2 +=
(*W_var) * ((*input_line_p[2]) +
3 * (*input_line_p[3]) +
3 * (*input_line_p[4]) +
(*input_line_p[5]));
value3 +=
(*W_var) * (2 * (*input_line_p[5]) +
3 * (*input_line_p[6]) +
3 * (*input_line_p[7]));
*(output_line_p[0]++) = divide[value1];
*(output_line_p[1]++) = divide[value2];
*(output_line_p[2]++) = divide[value3];
W += nb_W + 1;
}
input_line_p[0]++;
input_line_p[1]++;
input_line_p[2]++;
input_line_p[3]++;
input_line_p[4]++;
input_line_p[5]++;
input_line_p[6]++;
input_line_p[7]++;
}
}
}
else
{
mjpeg_debug ("Interlaced downscaling");
for (out_line_slice = 0; out_line_slice < local_out_nb_line_slice;
out_line_slice++)
{
u_c_p =
input +
((out_line_slice & ~(unsigned int) 1) * input_height_slice +
(out_line_slice % 2)) * local_input_width;
for (in_line = 0; in_line < input_height_slice; in_line++)
{
input_line_p[in_line] = u_c_p;
u_c_p += 2 * local_input_width;
}
u_c_p =
output +
((out_line_slice & ~(unsigned int) 1) *
output_height_slice +
(out_line_slice % 2)) * local_output_width;
for (out_line = 0; out_line < output_height_slice; out_line++)
{
output_line_p[out_line] = u_c_p;
u_c_p += 2 * local_output_width;
}
for (out_col_slice = 0;
out_col_slice < local_out_nb_col_slice; out_col_slice++)
{
H = height_coeff;
first_line = 0;
for (out_line = 0; out_line < output_height_slice;
out_line++)
{
nb_H = *H;
W = width_coeff;
for (out_col = 0; out_col < output_width_slice;
out_col++)
{
H_var = H + 1;
nb_W = *W;
value = 0;
last_line = first_line + nb_H;
for (current_line = first_line;
current_line < last_line; current_line++)
{
W_var = W + 1;
// we average nb_W columns of input : we increment input_line_p[current_line] and W_var each time, except for the last value where
// input_line_p[current_line] and W_var do not need to be incremented, but H_var does
for (j = 0; j < nb_W - 1; j++)
value +=
(*H_var) * (*W_var++) *
(*input_line_p[current_line]++);
value +=
(*H_var++) * (*W_var) *
(*input_line_p[current_line]);
}
// Straiforward implementation is
// *(output_line_p[out_line]++)=value/diviseur;
// round_off_error=value%diviseur;
// Here, we speed up things but using the pretabulated integral parts
*(output_line_p[out_line]++) = divide[value];
W += nb_W + 1;
}
H += nb_H + 1;
first_line += nb_H - 1;
input_line_p[first_line] -= input_width_slice - 1;
// If last line of input is to be reused in next loop,
// make the pointer points at the correct place
}
input_line_p[first_line] += input_width_slice - 1;
for (in_line = 0; in_line < input_height_slice; in_line++)
input_line_p[in_line]++;
}
}
}
}
if (treatment == 0)
mjpeg_error_exit1 ("Unknown specific downscaling treatment %u",
specific);
mjpeg_debug ("End of average_specific");
return (0);
}
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