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avfilter/vf_tinterlace: Favor using standard timebases for the output

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Reported-by: Vittorio Giovara <vittorio.giovara@gmail.com>
Inspired by discussion with Kieran Kunhya <kierank@obe.tv>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2014-12-01 20:52:10 +01:00
parent b4d41beebe
commit 59f1f764d6
2 changed files with 24 additions and 2 deletions
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1
libavfilter/tinterlace.h
View File

@ -44,6 +44,7 @@ enum TInterlaceMode {
typedef struct {
const AVClass *class;
enum TInterlaceMode mode; ///< interlace mode selected
AVRational preout_time_base;
int flags; ///< flags affecting interlacing algorithm
int frame; ///< number of the output frame
int vsub; ///< chroma vertical subsampling

25
libavfilter/vf_tinterlace.c
View File

@ -35,6 +35,7 @@
#define OFFSET(x) offsetof(TInterlaceContext, x)
#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
#define TINTERLACE_FLAG_VLPF 01
#define TINTERLACE_FLAG_EXACT_TB 2
static const AVOption tinterlace_options[] = {
{"mode", "select interlace mode", OFFSET(mode), AV_OPT_TYPE_INT, {.i64=MODE_MERGE}, 0, MODE_NB-1, FLAGS, "mode"},
@ -49,6 +50,7 @@ static const AVOption tinterlace_options[] = {
{"flags", "set flags", OFFSET(flags), AV_OPT_TYPE_FLAGS, {.i64 = 0}, 0, INT_MAX, 0, "flags" },
{"low_pass_filter", "enable vertical low-pass filter", 0, AV_OPT_TYPE_CONST, {.i64 = TINTERLACE_FLAG_VLPF}, INT_MIN, INT_MAX, FLAGS, "flags" },
{"vlpf", "enable vertical low-pass filter", 0, AV_OPT_TYPE_CONST, {.i64 = TINTERLACE_FLAG_VLPF}, INT_MIN, INT_MAX, FLAGS, "flags" },
{"exact_tb", "force a timebase which can represent timestamps exactly", 0, AV_OPT_TYPE_CONST, {.i64 = TINTERLACE_FLAG_EXACT_TB}, INT_MIN, INT_MAX, FLAGS, "flags" },
{NULL}
};
@ -62,6 +64,12 @@ static const enum AVPixelFormat full_scale_yuvj_pix_fmts[] = {
FULL_SCALE_YUVJ_FORMATS, AV_PIX_FMT_NONE
};
static const AVRational standard_tbs[] = {
{1, 25},
{1, 30},
{1001, 30000},
};
static int query_formats(AVFilterContext *ctx)
{
static const enum AVPixelFormat pix_fmts[] = {
@ -104,6 +112,7 @@ static int config_out_props(AVFilterLink *outlink)
AVFilterLink *inlink = outlink->src->inputs[0];
const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(outlink->format);
TInterlaceContext *tinterlace = ctx->priv;
int i;
tinterlace->vsub = desc->log2_chroma_h;
outlink->flags |= FF_LINK_FLAG_REQUEST_LOOP;
@ -135,14 +144,24 @@ static int config_out_props(AVFilterLink *outlink)
tinterlace->mode);
tinterlace->flags &= ~TINTERLACE_FLAG_VLPF;
}
tinterlace->preout_time_base = inlink->time_base;
if (tinterlace->mode == MODE_INTERLACEX2) {
outlink->time_base.num = inlink->time_base.num;
outlink->time_base.den = inlink->time_base.den * 2;
tinterlace->preout_time_base.den *= 2;
outlink->frame_rate = av_mul_q(inlink->frame_rate, (AVRational){2,1});
outlink->time_base = av_mul_q(inlink->time_base , (AVRational){1,2});
} else if (tinterlace->mode != MODE_PAD) {
outlink->frame_rate = av_mul_q(inlink->frame_rate, (AVRational){1,2});
outlink->time_base = av_mul_q(inlink->time_base , (AVRational){2,1});
}
for (i = 0; i<FF_ARRAY_ELEMS(standard_tbs); i++){
if (!av_cmp_q(standard_tbs[i], outlink->time_base))
break;
}
if (i == FF_ARRAY_ELEMS(standard_tbs) ||
(tinterlace->flags & TINTERLACE_FLAG_EXACT_TB))
outlink->time_base = tinterlace->preout_time_base;
if (tinterlace->flags & TINTERLACE_FLAG_VLPF) {
tinterlace->lowpass_line = lowpass_line_c;
if (ARCH_X86)
@ -326,6 +345,7 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *picref)
if (cur->pts != AV_NOPTS_VALUE)
out->pts = cur->pts*2;
out->pts = av_rescale_q(out->pts, tinterlace->preout_time_base, outlink->time_base);
if ((ret = ff_filter_frame(outlink, out)) < 0)
return ret;
@ -359,6 +379,7 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *picref)
av_assert0(0);
}
out->pts = av_rescale_q(out->pts, tinterlace->preout_time_base, outlink->time_base);
ret = ff_filter_frame(outlink, out);
tinterlace->frame++;