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avfilter/vf_format: re-use AVFilterFormats for pix_fmt parsing

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Rewrite the format parsing code to make it more easily generalizable. In
particular, `invert_formats` does not depend on the type of format list
passed to it, which allows me to re-use this helper in an upcoming
commit.

Slightly shortens the code, at the sole cost of doing several malloc
(ff_add_format) instead of a single malloc.
This commit is contained in:
Niklas Haas 2023-10-21 16:51:51 +02:00
parent 475a99628d
commit 2a942b4b3a
1 changed files with 43 additions and 60 deletions
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103
libavfilter/vf_format.c
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@ -41,25 +41,48 @@ typedef struct FormatContext {
const AVClass *class;
char *pix_fmts;
/**
* pix_fmts parsed into AVPixelFormats and terminated with
* AV_PIX_FMT_NONE
*/
enum AVPixelFormat *formats;
AVFilterFormats *formats; ///< parsed from `pix_fmts`
} FormatContext;
static av_cold void uninit(AVFilterContext *ctx)
{
FormatContext *s = ctx->priv;
av_freep(&s->formats);
ff_formats_unref(&s->formats);
}
static av_cold int invert_formats(AVFilterFormats **fmts,
AVFilterFormats *allfmts)
{
if (!allfmts)
return AVERROR(ENOMEM);
if (!*fmts) {
/* empty fmt list means no restriction, regardless of filter type */
ff_formats_unref(&allfmts);
return 0;
}
for (int i = 0; i < allfmts->nb_formats; i++) {
for (int j = 0; j < (*fmts)->nb_formats; j++) {
if (allfmts->formats[i] == (*fmts)->formats[j]) {
/* format is forbidden, remove it from allfmts list */
memmove(&allfmts->formats[i], &allfmts->formats[i+1],
(allfmts->nb_formats - (i+1)) * sizeof(*allfmts->formats));
allfmts->nb_formats--;
i--; /* repeat loop with same idx */
break;
}
}
}
ff_formats_unref(fmts);
*fmts = allfmts;
return 0;
}
static av_cold int init(AVFilterContext *ctx)
{
FormatContext *s = ctx->priv;
char *cur, *sep;
int nb_formats = 1;
int i;
enum AVPixelFormat pix_fmt;
int ret;
if (!s->pix_fmts) {
@ -67,64 +90,24 @@ static av_cold int init(AVFilterContext *ctx)
return AVERROR(EINVAL);
}
/* count the formats */
cur = s->pix_fmts;
while ((cur = strchr(cur, '|'))) {
nb_formats++;
if (*cur)
cur++;
}
s->formats = av_malloc_array(nb_formats + 1, sizeof(*s->formats));
if (!s->formats)
return AVERROR(ENOMEM);
/* parse the list of formats */
cur = s->pix_fmts;
for (i = 0; i < nb_formats; i++) {
for (char *sep, *cur = s->pix_fmts; cur; cur = sep) {
sep = strchr(cur, '|');
if (sep)
if (sep && *sep)
*sep++ = 0;
if ((ret = ff_parse_pixel_format(&s->formats[i], cur, ctx)) < 0)
if ((ret = ff_parse_pixel_format(&pix_fmt, cur, ctx)) < 0 ||
(ret = ff_add_format(&s->formats, pix_fmt)) < 0)
return ret;
cur = sep;
}
s->formats[nb_formats] = AV_PIX_FMT_NONE;
if (!strcmp(ctx->filter->name, "noformat")) {
const AVPixFmtDescriptor *desc = NULL;
enum AVPixelFormat *formats_allowed;
int nb_formats_lavu = 0, nb_formats_allowed = 0;
/* count the formats known to lavu */
while ((desc = av_pix_fmt_desc_next(desc)))
nb_formats_lavu++;
formats_allowed = av_malloc_array(nb_formats_lavu + 1, sizeof(*formats_allowed));
if (!formats_allowed)
return AVERROR(ENOMEM);
/* for each format known to lavu, check if it's in the list of
* forbidden formats */
while ((desc = av_pix_fmt_desc_next(desc))) {
enum AVPixelFormat pix_fmt = av_pix_fmt_desc_get_id(desc);
for (i = 0; i < nb_formats; i++) {
if (s->formats[i] == pix_fmt)
break;
}
if (i < nb_formats)
continue;
formats_allowed[nb_formats_allowed++] = pix_fmt;
}
formats_allowed[nb_formats_allowed] = AV_PIX_FMT_NONE;
av_freep(&s->formats);
s->formats = formats_allowed;
if ((ret = invert_formats(&s->formats, ff_all_formats(AVMEDIA_TYPE_VIDEO))) < 0)
return ret;
}
/* hold on to a ref for the lifetime of the filter */
if ((ret = ff_formats_ref(s->formats, &s->formats)) < 0)
return ret;
return 0;
}
@ -132,7 +115,7 @@ static int query_formats(AVFilterContext *ctx)
{
FormatContext *s = ctx->priv;
return ff_set_common_formats_from_list(ctx, s->formats);
return ff_set_common_formats(ctx, s->formats);
}