#include "formats.h"
#include "avfilter.h"
+#include "interlace.h"
#include "internal.h"
#include "video.h"
-enum ScanMode {
- MODE_TFF = 0,
- MODE_BFF = 1,
-};
-
-enum FieldType {
- FIELD_UPPER = 0,
- FIELD_LOWER = 1,
-};
-
-typedef struct {
- const AVClass *class;
- enum ScanMode scan; // top or bottom field first scanning
- int lowpass; // enable or disable low pass filterning
- AVFrame *cur, *next; // the two frames from which the new one is obtained
- int got_output; // signal an output frame is reday to request_frame()
-} InterlaceContext;
-
#define OFFSET(x) offsetof(InterlaceContext, x)
#define V AV_OPT_FLAG_VIDEO_PARAM
static const AVOption options[] = {
.version = LIBAVUTIL_VERSION_INT,
};
+static void lowpass_line_c(uint8_t *dstp, ptrdiff_t linesize,
+ const uint8_t *srcp,
+ const uint8_t *srcp_above,
+ const uint8_t *srcp_below)
+{
+ int i;
+ for (i = 0; i < linesize; i++) {
+ // this calculation is an integer representation of
+ // '0.5 * current + 0.25 * above + 0.25 * below'
+ // '1 +' is for rounding.
+ dstp[i] = (1 + srcp[i] + srcp[i] + srcp_above[i] + srcp_below[i]) >> 2;
+ }
+}
static const enum AVPixelFormat formats_supported[] = {
AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV444P,
av_log(ctx, AV_LOG_ERROR, "input video height is too small\n");
return AVERROR_INVALIDDATA;
}
+
+ if (!s->lowpass)
+ av_log(ctx, AV_LOG_WARNING, "Lowpass filter is disabled, "
+ "the resulting video will be aliased rather than interlaced.\n");
+
// same input size
outlink->w = inlink->w;
outlink->h = inlink->h;
outlink->time_base = inlink->time_base;
+ outlink->frame_rate = inlink->frame_rate;
// half framerate
outlink->time_base.num *= 2;
+ outlink->frame_rate.den *= 2;
+
+
+ if (s->lowpass) {
+ s->lowpass_line = lowpass_line_c;
+ if (ARCH_X86)
+ ff_interlace_init_x86(s);
+ }
av_log(ctx, AV_LOG_VERBOSE, "%s interlacing %s lowpass filter\n",
s->scan == MODE_TFF ? "tff" : "bff", (s->lowpass) ? "with" : "without");
return 0;
}
-static void copy_picture_field(AVFrame *src_frame, AVFrame *dst_frame,
+static void copy_picture_field(InterlaceContext *s,
+ AVFrame *src_frame, AVFrame *dst_frame,
AVFilterLink *inlink, enum FieldType field_type,
int lowpass)
{
const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
+ int hsub = desc->log2_chroma_w;
int vsub = desc->log2_chroma_h;
- int plane, i, j;
+ int plane, j;
for (plane = 0; plane < desc->nb_components; plane++) {
- int lines = (plane == 1 || plane == 2) ? -(-inlink->h) >> vsub : inlink->h;
- int linesize = av_image_get_linesize(inlink->format, inlink->w, plane);
+ int cols = (plane == 1 || plane == 2) ? AV_CEIL_RSHIFT(inlink->w, hsub)
+ : inlink->w;
+ int lines = (plane == 1 || plane == 2) ? AV_CEIL_RSHIFT(inlink->h, vsub)
+ : inlink->h;
uint8_t *dstp = dst_frame->data[plane];
const uint8_t *srcp = src_frame->data[plane];
- av_assert0(linesize >= 0);
+ av_assert0(cols >= 0 || lines >= 0);
lines = (lines + (field_type == FIELD_UPPER)) / 2;
- if (field_type == FIELD_LOWER)
+ if (field_type == FIELD_LOWER) {
srcp += src_frame->linesize[plane];
- if (field_type == FIELD_LOWER)
dstp += dst_frame->linesize[plane];
+ }
if (lowpass) {
int srcp_linesize = src_frame->linesize[plane] * 2;
int dstp_linesize = dst_frame->linesize[plane] * 2;
srcp_above = srcp; // there is no line above
if (j == 1)
srcp_below = srcp; // there is no line below
- for (i = 0; i < linesize; i++) {
- // this calculation is an integer representation of
- // '0.5 * current + 0.25 * above + 0.25 * below'
- // '1 +' is for rounding.
- dstp[i] = (1 + srcp[i] + srcp[i] + srcp_above[i] + srcp_below[i]) >> 2;
- }
+ s->lowpass_line(dstp, cols, srcp, srcp_above, srcp_below);
dstp += dstp_linesize;
srcp += srcp_linesize;
}
} else {
av_image_copy_plane(dstp, dst_frame->linesize[plane] * 2,
srcp, src_frame->linesize[plane] * 2,
- linesize, lines);
+ cols, lines);
}
}
}
av_log(ctx, AV_LOG_WARNING,
"video is already interlaced, adjusting framerate only\n");
out = av_frame_clone(s->cur);
+ if (!out)
+ return AVERROR(ENOMEM);
out->pts /= 2; // adjust pts to new framerate
ret = ff_filter_frame(outlink, out);
s->got_output = 1;
out->pts /= 2; // adjust pts to new framerate
/* copy upper/lower field from cur */
- copy_picture_field(s->cur, out, inlink, tff ? FIELD_UPPER : FIELD_LOWER, s->lowpass);
+ copy_picture_field(s, s->cur, out, inlink, tff ? FIELD_UPPER : FIELD_LOWER, s->lowpass);
av_frame_free(&s->cur);
/* copy lower/upper field from next */
- copy_picture_field(s->next, out, inlink, tff ? FIELD_LOWER : FIELD_UPPER, s->lowpass);
+ copy_picture_field(s, s->next, out, inlink, tff ? FIELD_LOWER : FIELD_UPPER, s->lowpass);
av_frame_free(&s->next);
ret = ff_filter_frame(outlink, out);
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