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x264/filters/video/depth.c

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/*****************************************************************************
* depth.c: bit-depth conversion video filter
*****************************************************************************
* Copyright (C) 2010-2025 x264 project
*
* Authors: Oskar Arvidsson <oskar@irock.se>
*
* 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., 51 Franklin Street, Fifth Floor, Boston, MA 02111, USA.
*
* This program is also available under a commercial proprietary license.
* For more information, contact us at licensing@x264.com.
*****************************************************************************/
#include "video.h"
#include "common/common.h"
#define depth_filter x264_glue3(depth, BIT_DEPTH, filter)
#if BIT_DEPTH == 8
#define NAME "depth_8"
#else
#define NAME "depth_10"
#endif
#define FAIL_IF_ERROR( cond, ... ) FAIL_IF_ERR( cond, NAME, __VA_ARGS__ )
cli_vid_filter_t depth_filter;
typedef struct
{
hnd_t prev_hnd;
cli_vid_filter_t prev_filter;
int bit_depth;
int dst_csp;
cli_pic_t buffer;
int16_t *error_buf;
} depth_hnd_t;
static int depth_filter_csp_is_supported( int csp )
{
int csp_mask = csp & X264_CSP_MASK;
return csp_mask == X264_CSP_I400 ||
csp_mask == X264_CSP_I420 ||
csp_mask == X264_CSP_I422 ||
csp_mask == X264_CSP_I444 ||
csp_mask == X264_CSP_YV12 ||
csp_mask == X264_CSP_YV16 ||
csp_mask == X264_CSP_YV24 ||
csp_mask == X264_CSP_NV12 ||
csp_mask == X264_CSP_NV21 ||
csp_mask == X264_CSP_NV16 ||
csp_mask == X264_CSP_BGR ||
csp_mask == X264_CSP_RGB ||
csp_mask == X264_CSP_BGRA;
}
static int csp_num_interleaved( int csp, int plane )
{
int csp_mask = csp & X264_CSP_MASK;
return (csp_mask == X264_CSP_NV12 || csp_mask == X264_CSP_NV21 || csp_mask == X264_CSP_NV16) && plane == 1 ? 2 :
csp_mask == X264_CSP_BGR || csp_mask == X264_CSP_RGB ? 3 :
csp_mask == X264_CSP_BGRA ? 4 :
1;
}
/* The dithering algorithm is based on Sierra-2-4A error diffusion. It has been
* written in such a way so that if the source has been upconverted using the
* same algorithm as used in scale_image, dithering down to the source bit
* depth again is lossless. */
#define DITHER_PLANE( pitch ) \
static void dither_plane_##pitch( pixel *dst, int dst_stride, uint16_t *src, int src_stride, \
int width, int height, int16_t *errors ) \
{ \
const int lshift = 16-BIT_DEPTH; \
const int rshift = 16-BIT_DEPTH+2; \
const int half = 1 << (16-BIT_DEPTH+1); \
const int pixel_max = (1 << BIT_DEPTH)-1; \
memset( errors, 0, (width+1) * sizeof(int16_t) ); \
for( int y = 0; y < height; y++, src += src_stride, dst += dst_stride ) \
{ \
int err = 0; \
for( int x = 0; x < width; x++ ) \
{ \
err = err*2 + errors[x] + errors[x+1]; \
dst[x*pitch] = x264_clip3( ((src[x*pitch]<<2)+err+half) >> rshift, 0, pixel_max ); \
errors[x] = err = src[x*pitch] - (dst[x*pitch] << lshift); \
} \
} \
}
DITHER_PLANE( 1 )
DITHER_PLANE( 2 )
DITHER_PLANE( 3 )
DITHER_PLANE( 4 )
static void dither_image( cli_image_t *out, cli_image_t *img, int16_t *error_buf )
{
int csp_mask = img->csp & X264_CSP_MASK;
for( int i = 0; i < img->planes; i++ )
{
int num_interleaved = csp_num_interleaved( img->csp, i );
int height = x264_cli_csps[csp_mask].height[i] * img->height;
int width = x264_cli_csps[csp_mask].width[i] * img->width / num_interleaved;
#define CALL_DITHER_PLANE( pitch, off ) \
dither_plane_##pitch( ((pixel*)out->plane[i])+off, out->stride[i]/SIZEOF_PIXEL, \
((uint16_t*)img->plane[i])+off, img->stride[i]/2, width, height, error_buf )
if( num_interleaved == 4 )
{
CALL_DITHER_PLANE( 4, 0 );
CALL_DITHER_PLANE( 4, 1 );
CALL_DITHER_PLANE( 4, 2 );
CALL_DITHER_PLANE( 4, 3 ); //we probably can skip this one
}
else if( num_interleaved == 3 )
{
CALL_DITHER_PLANE( 3, 0 );
CALL_DITHER_PLANE( 3, 1 );
CALL_DITHER_PLANE( 3, 2 );
}
else if( num_interleaved == 2 )
{
CALL_DITHER_PLANE( 2, 0 );
CALL_DITHER_PLANE( 2, 1 );
}
else //if( num_interleaved == 1 )
{
CALL_DITHER_PLANE( 1, 0 );
}
}
}
static void scale_image( cli_image_t *output, cli_image_t *img )
{
int csp_mask = img->csp & X264_CSP_MASK;
const int shift = BIT_DEPTH - 8;
for( int i = 0; i < img->planes; i++ )
{
uint8_t *src = img->plane[i];
uint16_t *dst = (uint16_t*)output->plane[i];
int height = x264_cli_csps[csp_mask].height[i] * img->height;
int width = x264_cli_csps[csp_mask].width[i] * img->width;
for( int j = 0; j < height; j++ )
{
for( int k = 0; k < width; k++ )
dst[k] = src[k] << shift;
src += img->stride[i];
dst += output->stride[i]/2;
}
}
}
static int get_frame( hnd_t handle, cli_pic_t *output, int frame )
{
depth_hnd_t *h = handle;
if( h->prev_filter.get_frame( h->prev_hnd, output, frame ) )
return -1;
if( h->bit_depth < 16 && output->img.csp & X264_CSP_HIGH_DEPTH )
{
dither_image( &h->buffer.img, &output->img, h->error_buf );
output->img = h->buffer.img;
}
else if( h->bit_depth > 8 && !(output->img.csp & X264_CSP_HIGH_DEPTH) )
{
scale_image( &h->buffer.img, &output->img );
output->img = h->buffer.img;
}
return 0;
}
static int release_frame( hnd_t handle, cli_pic_t *pic, int frame )
{
depth_hnd_t *h = handle;
return h->prev_filter.release_frame( h->prev_hnd, pic, frame );
}
static void free_filter( hnd_t handle )
{
depth_hnd_t *h = handle;
h->prev_filter.free( h->prev_hnd );
x264_cli_pic_clean( &h->buffer );
x264_free( h );
}
static int init( hnd_t *handle, cli_vid_filter_t *filter, video_info_t *info,
x264_param_t *param, char *opt_string )
{
int ret = 0;
int change_fmt = (info->csp ^ param->i_csp) & X264_CSP_HIGH_DEPTH;
int csp = ~(~info->csp ^ change_fmt);
int bit_depth = 8*x264_cli_csp_depth_factor( csp );
if( opt_string )
{
static const char * const optlist[] = { "bit_depth", NULL };
char **opts = x264_split_options( opt_string, optlist );
if( opts )
{
char *str_bit_depth = x264_get_option( "bit_depth", opts );
bit_depth = x264_otoi( str_bit_depth, -1 );
ret = bit_depth < 8 || bit_depth > 16;
csp = bit_depth > 8 ? csp | X264_CSP_HIGH_DEPTH : csp & ~X264_CSP_HIGH_DEPTH;
change_fmt = (info->csp ^ csp) & X264_CSP_HIGH_DEPTH;
free( opts );
}
else
ret = 1;
}
FAIL_IF_ERROR( bit_depth != BIT_DEPTH, "this filter supports only bit depth %d\n", BIT_DEPTH );
FAIL_IF_ERROR( ret, "unsupported bit depth conversion.\n" );
/* only add the filter to the chain if it's needed */
if( change_fmt || bit_depth != 8 * x264_cli_csp_depth_factor( csp ) )
{
FAIL_IF_ERROR( !depth_filter_csp_is_supported(csp), "unsupported colorspace.\n" );
depth_hnd_t *h = x264_malloc( sizeof(depth_hnd_t) + (info->width+1)*sizeof(int16_t) );
if( !h )
return -1;
h->error_buf = (int16_t*)(h + 1);
h->dst_csp = csp;
h->bit_depth = bit_depth;
h->prev_hnd = *handle;
h->prev_filter = *filter;
if( x264_cli_pic_alloc( &h->buffer, h->dst_csp, info->width, info->height ) )
{
x264_free( h );
return -1;
}
*handle = h;
*filter = depth_filter;
info->csp = h->dst_csp;
}
return 0;
}
cli_vid_filter_t depth_filter = { NAME, NULL, init, get_frame, release_frame, free_filter, NULL };
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