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avfilter/yadif_common: Add field type tracking to help bwdif 

The bwdif filter can use common yadif frame management if we track
when a field is the first or last field in a sequence. While this
information is not used by yadif, the added benefit of removing the
duplicated frame management logic makes it worth tracking this state
in the common code.
This commit is contained in:
Philip Langdale 2018-11-04 10:02:07 -08:00
parent 19d3d0c057
commit fa74e4aef2
2 changed files with 23 additions and 3 deletions
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14
libavfilter/yadif.h
View File

@ -41,6 +41,12 @@ enum YADIFDeint {
YADIF_DEINT_INTERLACED = 1, ///< only deinterlace frames marked as interlaced
};
enum YADIFCurrentField {
YADIF_FIELD_BACK_END = -1, ///< The last frame in a sequence
YADIF_FIELD_END = 0, ///< The first or last field in a sequence
YADIF_FIELD_NORMAL = 1, ///< A normal field in the middle of a sequence
};
typedef struct YADIFContext {
const AVClass *class;
@ -70,6 +76,14 @@ typedef struct YADIFContext {
int eof;
uint8_t *temp_line;
int temp_line_size;
/*
* An algorithm that treats first and/or last fields in a sequence
* differently can use this to detect those cases. It is the algorithm's
* responsibility to set the value to YADIF_FIELD_NORMAL after processing
* the first field.
*/
int current_field; ///< YADIFCurrentField
} YADIFContext;
void ff_yadif_init_x86(YADIFContext *yadif);

12
libavfilter/yadif_common.c
View File

@ -44,6 +44,8 @@ static int return_frame(AVFilterContext *ctx, int is_second)
av_frame_copy_props(yadif->out, yadif->cur);
yadif->out->interlaced_frame = 0;
if (yadif->current_field == YADIF_FIELD_BACK_END)
yadif->current_field = YADIF_FIELD_END;
}
yadif->filter(ctx, yadif->out, tff ^ !is_second, tff);
@ -103,9 +105,12 @@ int ff_yadif_filter_frame(AVFilterLink *link, AVFrame *frame)
yadif->cur = yadif->next;
yadif->next = frame;
if (!yadif->cur &&
!(yadif->cur = av_frame_clone(yadif->next)))
return AVERROR(ENOMEM);
if (!yadif->cur) {
yadif->cur = av_frame_clone(yadif->next);
if (!yadif->cur)
return AVERROR(ENOMEM);
yadif->current_field = YADIF_FIELD_END;
}
if (checkstride(yadif, yadif->next, yadif->cur)) {
av_log(ctx, AV_LOG_VERBOSE, "Reallocating frame due to differing stride\n");
@ -173,6 +178,7 @@ int ff_yadif_request_frame(AVFilterLink *link)
if (!next)
return AVERROR(ENOMEM);
yadif->current_field = YADIF_FIELD_BACK_END;
next->pts = yadif->next->pts * 2 - yadif->cur->pts;
ff_yadif_filter_frame(ctx->inputs[0], next);