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lavfi/color: cache and reuse colored picture in context

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Avoid to fill the same picture again and again with the same content.

Optimize computation, and provides an example for the use of the
AV_PERM_REUSE permission flag.
This commit is contained in:
Stefano Sabatini 2012-07-29 16:35:43 +02:00
parent 47b6b7a2b9
commit a74dcb7dc0
1 changed files with 22 additions and 12 deletions
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34
libavfilter/vsrc_color.c
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@ -45,6 +45,7 @@ typedef struct {
uint64_t pts;
FFDrawContext draw;
FFDrawColor color;
AVFilterBufferRef *picref; ///< cached reference containing the painted picture
} ColorContext;
#define OFFSET(x) offsetof(ColorContext, x)
@ -92,6 +93,12 @@ end:
return ret;
}
static av_cold void color_uninit(AVFilterContext *ctx)
{
ColorContext *color = ctx->priv;
avfilter_unref_bufferp(&color->picref);
}
static int query_formats(AVFilterContext *ctx)
{
ff_set_common_formats(ctx, ff_draw_supported_pixel_formats(0));
@ -124,18 +131,24 @@ static int color_config_props(AVFilterLink *inlink)
static int color_request_frame(AVFilterLink *link)
{
ColorContext *color = link->src->priv;
AVFilterBufferRef *picref = ff_get_video_buffer(link, AV_PERM_WRITE, color->w, color->h);
AVFilterBufferRef *buf_out;
int ret;
if (!picref)
return AVERROR(ENOMEM);
if (!color->picref) {
color->picref =
ff_get_video_buffer(link, AV_PERM_WRITE|AV_PERM_PRESERVE|AV_PERM_REUSE,
color->w, color->h);
if (!color->picref)
return AVERROR(ENOMEM);
ff_fill_rectangle(&color->draw, &color->color,
color->picref->data, color->picref->linesize,
0, 0, color->w, color->h);
color->picref->video->sample_aspect_ratio = (AVRational) {1, 1};
color->picref->pos = -1;
}
picref->video->sample_aspect_ratio = (AVRational) {1, 1};
picref->pts = color->pts++;
picref->pos = -1;
buf_out = avfilter_ref_buffer(picref, ~0);
color->picref->pts = color->pts++;
buf_out = avfilter_ref_buffer(color->picref, ~AV_PERM_WRITE);
if (!buf_out) {
ret = AVERROR(ENOMEM);
goto fail;
@ -145,8 +158,6 @@ static int color_request_frame(AVFilterLink *link)
if (ret < 0)
goto fail;
ff_fill_rectangle(&color->draw, &color->color, picref->data, picref->linesize,
0, 0, color->w, color->h);
ret = ff_draw_slice(link, 0, color->h, 1);
if (ret < 0)
goto fail;
@ -154,8 +165,6 @@ static int color_request_frame(AVFilterLink *link)
ret = ff_end_frame(link);
fail:
avfilter_unref_buffer(picref);
return ret;
}
@ -165,6 +174,7 @@ AVFilter avfilter_vsrc_color = {
.priv_size = sizeof(ColorContext),
.init = color_init,
.uninit = color_uninit,
.query_formats = query_formats,