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Code Issues Releases Activity

lavfi/fieldorder: work with non writtable frames too

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Signed-off-by: Paul B Mahol <onemda@gmail.com>
This commit is contained in:
Paul B Mahol 2013-09-06 14:34:28 +00:00
parent 33dacda40b
commit 6770fa4df8
1 changed files with 32 additions and 14 deletions
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46
libavfilter/vf_fieldorder.c
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@ -80,21 +80,35 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
AVFilterContext *ctx = inlink->dst;
FieldOrderContext *s = ctx->priv;
AVFilterLink *outlink = ctx->outputs[0];
int h, plane, line_step, line_size, line;
uint8_t *data;
int h, plane, src_line_step, dst_line_step, line_size, line;
uint8_t *dst, *src;
AVFrame *out;
if (!frame->interlaced_frame ||
frame->top_field_first == s->dst_tff)
return ff_filter_frame(outlink, frame);
if (av_frame_is_writable(frame)) {
out = frame;
} else {
out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
if (!out) {
av_frame_free(&frame);
return AVERROR(ENOMEM);
}
av_frame_copy_props(out, frame);
}
av_dlog(ctx,
"picture will move %s one line\n",
s->dst_tff ? "up" : "down");
h = frame->height;
for (plane = 0; plane < 4 && frame->data[plane] && frame->linesize[plane]; plane++) {
line_step = frame->linesize[plane];
dst_line_step = out->linesize[plane];
src_line_step = frame->linesize[plane];
line_size = s->line_size[plane];
data = frame->data[plane];
dst = out->data[plane];
src = frame->data[plane];
if (s->dst_tff) {
/** Move every line up one line, working from
* the top to the bottom of the frame.
@ -103,11 +117,12 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
* penultimate line from that field. */
for (line = 0; line < h; line++) {
if (1 + line < frame->height) {
memcpy(data, data + line_step, line_size);
memcpy(dst, src + src_line_step, line_size);
} else {
memcpy(data, data - line_step - line_step, line_size);
memcpy(dst, src - 2 * src_line_step, line_size);
}
data += line_step;
dst += dst_line_step;
src += src_line_step;
}
} else {
/** Move every line down one line, working from
@ -115,20 +130,24 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
* The original bottom line is lost.
* The new first line is created as a copy of the
* second line from that field. */
data += (h - 1) * line_step;
dst += (h - 1) * dst_line_step;
src += (h - 1) * src_line_step;
for (line = h - 1; line >= 0 ; line--) {
if (line > 0) {
memcpy(data, data - line_step, line_size);
memcpy(dst, src - src_line_step, line_size);
} else {
memcpy(data, data + line_step + line_step, line_size);
memcpy(dst, src + 2 * src_line_step, line_size);
}
data -= line_step;
dst -= dst_line_step;
src -= src_line_step;
}
}
}
frame->top_field_first = s->dst_tff;
out->top_field_first = s->dst_tff;
return ff_filter_frame(outlink, frame);
if (frame != out)
av_frame_free(&frame);
return ff_filter_frame(outlink, out);
}
#define OFFSET(x) offsetof(FieldOrderContext, x)
@ -149,7 +168,6 @@ static const AVFilterPad avfilter_vf_fieldorder_inputs[] = {
.type = AVMEDIA_TYPE_VIDEO,
.config_props = config_input,
.filter_frame = filter_frame,
.needs_writable = 1,
},
{ NULL }
};