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Code Issues Releases Activity

avcodec/ass: Faster ff_ass_add_rect()

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Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2021-12-17 19:48:51 +01:00
parent 6f210ebae2
commit aed698efc3
2 changed files with 37 additions and 6 deletions
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36
libavcodec/ass.c
View File

@ -114,17 +114,34 @@ char *ff_ass_get_dialog(int readorder, int layer, const char *style,
speaker ? speaker : "", text);
}
int ff_ass_add_rect(AVSubtitle *sub, const char *dialog,
int ff_ass_add_rect2(AVSubtitle *sub, const char *dialog,
int readorder, int layer, const char *style,
const char *speaker)
const char *speaker, unsigned *nb_rect_allocated)
{
AVSubtitleRect **rects, *rect;
AVSubtitleRect **rects = sub->rects, *rect;
char *ass_str;
uint64_t new_nb = 0;
rects = av_realloc_array(sub->rects, sub->num_rects+1, sizeof(*sub->rects));
if (!rects)
if (sub->num_rects >= UINT_MAX)
return AVERROR(ENOMEM);
sub->rects = rects;
if (nb_rect_allocated && *nb_rect_allocated <= sub->num_rects) {
if (sub->num_rects < UINT_MAX / 17 * 16) {
new_nb = sub->num_rects + sub->num_rects/16 + 1;
} else
new_nb = UINT_MAX;
} else if (!nb_rect_allocated)
new_nb = sub->num_rects + 1;
if (new_nb) {
rects = av_realloc_array(rects, new_nb, sizeof(*sub->rects));
if (!rects)
return AVERROR(ENOMEM);
if (nb_rect_allocated)
*nb_rect_allocated = new_nb;
sub->rects = rects;
}
rect = av_mallocz(sizeof(*rect));
if (!rect)
return AVERROR(ENOMEM);
@ -137,6 +154,13 @@ int ff_ass_add_rect(AVSubtitle *sub, const char *dialog,
return 0;
}
int ff_ass_add_rect(AVSubtitle *sub, const char *dialog,
int readorder, int layer, const char *style,
const char *speaker)
{
return ff_ass_add_rect2(sub, dialog, readorder, layer, style, speaker, NULL);
}
void ff_ass_decoder_flush(AVCodecContext *avctx)
{
FFASSDecoderContext *s = avctx->priv_data;

7
libavcodec/ass.h
View File

@ -118,6 +118,13 @@ int ff_ass_add_rect(AVSubtitle *sub, const char *dialog,
int readorder, int layer, const char *style,
const char *speaker);
/**
* Add an ASS dialog to a subtitle.
*/
int ff_ass_add_rect2(AVSubtitle *sub, const char *dialog,
int readorder, int layer, const char *style,
const char *speaker, unsigned *nb_rect_allocated);
/**
* Helper to flush a text subtitles decoder making use of the
* FFASSDecoderContext.