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Code Issues Releases Activity

Implement inline function av_fill_image_max_pixstep() and use it for

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factorizing code.

Originally committed as revision 24827 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Stefano Sabatini 2010-08-18 21:02:38 +00:00
parent 25ae798c87
commit a6ddf8bf0f
5 changed files with 43 additions and 40 deletions
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2
libavcore/avcore.h
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@ -27,7 +27,7 @@
#include <libavutil/avutil.h>
#define LIBAVCORE_VERSION_MAJOR 0
#define LIBAVCORE_VERSION_MINOR 4
#define LIBAVCORE_VERSION_MINOR 5
#define LIBAVCORE_VERSION_MICRO 0
#define LIBAVCORE_VERSION_INT AV_VERSION_INT(LIBAVCORE_VERSION_MAJOR, \

24
libavcore/imgutils.c
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@ -29,21 +29,12 @@ int av_get_image_linesize(enum PixelFormat pix_fmt, int width, int plane)
const AVPixFmtDescriptor *desc = &av_pix_fmt_descriptors[pix_fmt];
int max_step [4]; /* max pixel step for each plane */
int max_step_comp[4]; /* the component for each plane which has the max pixel step */
int s, i;
int s;
if (desc->flags & PIX_FMT_BITSTREAM)
return (width * (desc->comp[0].step_minus1+1) + 7) >> 3;
memset(max_step , 0, sizeof(max_step ));
memset(max_step_comp, 0, sizeof(max_step_comp));
for (i = 0; i < 4; i++) {
const AVComponentDescriptor *comp = &(desc->comp[i]);
if ((comp->step_minus1+1) > max_step[comp->plane]) {
max_step [comp->plane] = comp->step_minus1+1;
max_step_comp[comp->plane] = i;
}
}
av_fill_image_max_pixstep(max_step, max_step_comp, desc);
s = (max_step_comp[plane] == 1 || max_step_comp[plane] == 2) ? desc->log2_chroma_w : 0;
return max_step[plane] * (((width + (1 << s) - 1)) >> s);
}
@ -65,16 +56,7 @@ int av_fill_image_linesizes(int linesizes[4], enum PixelFormat pix_fmt, int widt
return 0;
}
memset(max_step , 0, sizeof(max_step ));
memset(max_step_comp, 0, sizeof(max_step_comp));
for (i = 0; i < 4; i++) {
const AVComponentDescriptor *comp = &(desc->comp[i]);
if ((comp->step_minus1+1) > max_step[comp->plane]) {
max_step [comp->plane] = comp->step_minus1+1;
max_step_comp[comp->plane] = i;
}
}
av_fill_image_max_pixstep(max_step, max_step_comp, desc);
for (i = 0; i < 4; i++) {
int s = (max_step_comp[i] == 1 || max_step_comp[i] == 2) ? desc->log2_chroma_w : 0;
linesizes[i] = max_step[i] * (((width + (1 << s) - 1)) >> s);

36
libavcore/imgutils.h
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@ -24,9 +24,43 @@
* misc image utilities
*/
#include "libavutil/pixfmt.h"
#include "libavutil/pixdesc.h"
#include "avcore.h"
/**
* Compute the max pixel step for each plane of an image with a
* format described by pixdesc
*
* The pixel step is the distance in bytes between the first byte of
* the group of bytes which describe a pixel component and the first
* byte of the successive group in the same plane for the same
* component.
*
* @param max_pixstep an array which is filled with the max pixel step
* for each plane. Since a plane may contain different pixel
* components, the computed max_pixstep[plane] is relative to the
* component in the plane with the max pixel step.
* @param max_pixstep_comp an array which is filled with the component
* for each plane which has the max pixel step. May be NULL.
*/
static inline void av_fill_image_max_pixstep(int max_pixstep[4], int max_pixstep_comp[4],
const AVPixFmtDescriptor *pixdesc)
{
int i;
memset(max_pixstep, 0, 4*sizeof(max_pixstep[0]));
if (max_pixstep_comp)
memset(max_pixstep_comp, 0, 4*sizeof(max_pixstep_comp[0]));
for (i = 0; i < 4; i++) {
const AVComponentDescriptor *comp = &(pixdesc->comp[i]);
if ((comp->step_minus1+1) > max_pixstep[comp->plane]) {
max_pixstep[comp->plane] = comp->step_minus1+1;
if (max_pixstep_comp)
max_pixstep_comp[comp->plane] = i;
}
}
}
/**
* Compute the size of an image line with format pix_fmt and width
* width for the plane plane.

11
libavfilter/vf_crop.c
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@ -24,7 +24,7 @@
*/
#include "avfilter.h"
#include "libavutil/pixdesc.h"
#include "libavcore/imgutils.h"
typedef struct {
int x; ///< x offset of the non-cropped area with respect to the input area
@ -83,15 +83,8 @@ static int config_input(AVFilterLink *link)
AVFilterContext *ctx = link->dst;
CropContext *crop = ctx->priv;
const AVPixFmtDescriptor *pix_desc = &av_pix_fmt_descriptors[link->format];
int i;
memset(crop->max_step, 0, sizeof(crop->max_step));
for (i = 0; i < 4; i++) {
const AVComponentDescriptor *comp = &(pix_desc->comp[i]);
if ((comp->step_minus1+1) > crop->max_step[comp->plane])
crop->max_step[comp->plane] = comp->step_minus1+1;
}
av_fill_image_max_pixstep(crop->max_step, NULL, pix_desc);
crop->hsub = av_pix_fmt_descriptors[link->format].log2_chroma_w;
crop->vsub = av_pix_fmt_descriptors[link->format].log2_chroma_h;

10
libavfilter/vf_hflip.c
View File

@ -27,6 +27,7 @@
#include "avfilter.h"
#include "libavutil/pixdesc.h"
#include "libavutil/intreadwrite.h"
#include "libavcore/imgutils.h"
typedef struct {
int max_step[4]; ///< max pixel step for each plane, expressed as a number of bytes
@ -68,15 +69,8 @@ static int config_props(AVFilterLink *inlink)
{
FlipContext *flip = inlink->dst->priv;
const AVPixFmtDescriptor *pix_desc = &av_pix_fmt_descriptors[inlink->format];
int i;
memset(flip->max_step, 0, sizeof(flip->max_step));
for (i = 0; i < 4; i++) {
const AVComponentDescriptor *comp = &(pix_desc->comp[i]);
if ((comp->step_minus1+1) > flip->max_step[comp->plane])
flip->max_step[comp->plane] = comp->step_minus1+1;
}
av_fill_image_max_pixstep(flip->max_step, NULL, pix_desc);
flip->hsub = av_pix_fmt_descriptors[inlink->format].log2_chroma_w;
flip->vsub = av_pix_fmt_descriptors[inlink->format].log2_chroma_h;