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Fix design of the pad filter.

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Previously the pad filter just drawed borders in the surrounding of the input
without checking if this area was allocated or writeable. Now we check and
allocate a new buffer if the input is unsuitable.

Originally committed as revision 26315 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Niedermayer 2011-01-11 23:53:24 +00:00
parent 36dc00de52
commit e3331706fc
1 changed files with 76 additions and 4 deletions
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80
libavfilter/vf_pad.c
View File

@ -27,6 +27,7 @@
#include "avfilter.h"
#include "libavutil/pixdesc.h"
#include "libavutil/colorspace.h"
#include "libavutil/avassert.h"
#include "libavcore/imgutils.h"
#include "libavcore/parseutils.h"
@ -100,6 +101,24 @@ static void draw_rectangle(AVFilterBufferRef *outpic, uint8_t *line[4], int line
}
}
static void copy_rectangle(AVFilterBufferRef *outpic,uint8_t *line[4], int line_step[4], int linesize[4],
int hsub, int vsub, int x, int y, int y2, int w, int h)
{
int i, plane;
uint8_t *p;
for (plane = 0; plane < 4 && outpic->data[plane]; plane++) {
int hsub1 = plane == 1 || plane == 2 ? hsub : 0;
int vsub1 = plane == 1 || plane == 2 ? vsub : 0;
p = outpic->data[plane] + (y >> vsub1) * outpic->linesize[plane];
for (i = 0; i < (h >> vsub1); i++) {
memcpy(p + (x >> hsub1) * line_step[plane], line[plane] + linesize[plane]*(i+(y2>>vsub1)), (w >> hsub1) * line_step[plane]);
p += outpic->linesize[plane];
}
}
}
static int query_formats(AVFilterContext *ctx)
{
static const enum PixelFormat pix_fmts[] = {
@ -132,6 +151,7 @@ typedef struct {
uint8_t *line[4];
int line_step[4];
int hsub, vsub; ///< chroma subsampling values
int needs_copy;
} PadContext;
static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque)
@ -243,21 +263,65 @@ static AVFilterBufferRef *get_video_buffer(AVFilterLink *inlink, int perms, int
return picref;
}
static int does_clip(PadContext *pad, AVFilterBufferRef *outpicref, int plane, int hsub, int vsub, int x, int y)
{
int64_t x_in_buf, y_in_buf;
x_in_buf = outpicref->data[plane] - outpicref->buf->data[plane]
+ (x >> hsub) * pad ->line_step[plane]
+ (y >> vsub) * outpicref->linesize [plane];
if(x_in_buf < 0 || x_in_buf % pad->line_step[plane])
return 1;
x_in_buf /= pad->line_step[plane];
av_assert0(outpicref->buf->linesize[plane]>0); //while reference can use negative linesize the main buffer should not
y_in_buf = x_in_buf / outpicref->buf->linesize[plane];
x_in_buf %= outpicref->buf->linesize[plane];
if( y_in_buf<<vsub >= outpicref->buf->h
|| x_in_buf<<hsub >= outpicref->buf->w)
return 1;
return 0;
}
static void start_frame(AVFilterLink *inlink, AVFilterBufferRef *inpicref)
{
PadContext *pad = inlink->dst->priv;
AVFilterBufferRef *outpicref = avfilter_ref_buffer(inpicref, ~0);
int plane;
inlink->dst->outputs[0]->out_buf = outpicref;
for (plane = 0; plane < 4 && outpicref->data[plane]; plane++) {
int hsub = (plane == 1 || plane == 2) ? pad->hsub : 0;
int vsub = (plane == 1 || plane == 2) ? pad->vsub : 0;
outpicref->data[plane] -= (pad->x >> hsub) * pad->line_step[plane] +
(pad->y >> vsub) * outpicref->linesize[plane];
av_assert0(outpicref->buf->w>0 && outpicref->buf->h>0);
if(outpicref->format != outpicref->buf->format) //unsupported currently
break;
outpicref->data[plane] -= (pad->x >> hsub) * pad ->line_step[plane]
+ (pad->y >> vsub) * outpicref->linesize [plane];
if( does_clip(pad, outpicref, plane, hsub, vsub, 0, 0)
|| does_clip(pad, outpicref, plane, hsub, vsub, 0, pad->h-1)
|| does_clip(pad, outpicref, plane, hsub, vsub, pad->w-1, 0)
|| does_clip(pad, outpicref, plane, hsub, vsub, pad->w-1, pad->h-1)
)
break;
}
pad->needs_copy= plane < 4 && outpicref->data[plane];
if(pad->needs_copy){
av_log(inlink->dst, AV_LOG_DEBUG, "Direct padding impossible allocating new frame\n");
avfilter_unref_buffer(outpicref);
outpicref = avfilter_get_video_buffer(inlink->dst->outputs[0], AV_PERM_WRITE | AV_PERM_NEG_LINESIZES,
FFMAX(inlink->w, pad->w),
FFMAX(inlink->h, pad->h));
avfilter_copy_buffer_ref_props(outpicref, inpicref);
}
inlink->dst->outputs[0]->out_buf = outpicref;
outpicref->video->w = pad->w;
outpicref->video->h = pad->h;
@ -298,6 +362,7 @@ static void draw_slice(AVFilterLink *link, int y, int h, int slice_dir)
{
PadContext *pad = link->dst->priv;
AVFilterBufferRef *outpic = link->dst->outputs[0]->out_buf;
AVFilterBufferRef *inpic = link->cur_buf;
y += pad->y;
@ -311,6 +376,13 @@ static void draw_slice(AVFilterLink *link, int y, int h, int slice_dir)
/* left border */
draw_rectangle(outpic, pad->line, pad->line_step, pad->hsub, pad->vsub,
0, y, pad->x, h);
if(pad->needs_copy){
copy_rectangle(outpic,
inpic->data, pad->line_step, inpic->linesize, pad->hsub, pad->vsub,
pad->x, y, y-pad->y, inpic->video->w, h);
}
/* right border */
draw_rectangle(outpic, pad->line, pad->line_step, pad->hsub, pad->vsub,
pad->x + pad->in_w, y, pad->w - pad->x - pad->in_w, h);