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FFmpeg/libavfilter/vf_tinterlace.c
Niklas Haas a69b08790b avfilter/vf_tinterlace: support full-range YUV 
This filter, when used in the "pad" mode, currently makes the
distinction between limited and full range solely by testing for YUVJ
pixel formats at link setup time. This is deprecated and should be
improved to perform the detection based on the per-frame metadata.

In order to make this distinction based on color range metadata, which
is only known at the time of filtering frames, for simplicity, we simply
allocate two copies of the "black" frame - one for limited range and the
other for full range metadata. This could be done more dynamically (e.g.
as-needed or simply by blitting the appropriate pixel value directly),
but this change is relatively simple and preserves the structure of the
existing code.

This commit actually fixes a bug in FATE - the new output is correct for
the first time. The previous md5 ref was of a frame that incorrectly
combined full-range pixel data with limited-range black fields. The
corresponding result has been updated.

Signed-off-by: Niklas Haas <git@haasn.dev>
2022-12-20 14:02:37 +01:00

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/*
* Copyright (c) 2017 Thomas Mundt <tmundt75@gmail.com>
* Copyright (c) 2011 Stefano Sabatini
* Copyright (c) 2010 Baptiste Coudurier
* Copyright (c) 2003 Michael Zucchi <notzed@ximian.com>
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with FFmpeg if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
/**
* @file
* temporal field interlace filter, ported from MPlayer/libmpcodecs
*/
#include "libavutil/opt.h"
#include "libavutil/imgutils.h"
#include "libavutil/avassert.h"
#include "avfilter.h"
#include "internal.h"
#include "tinterlace.h"
#define OFFSET(x) offsetof(TInterlaceContext, x)
#define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
static const AVOption tinterlace_options[] = {
{"mode", "select interlace mode", OFFSET(mode), AV_OPT_TYPE_INT, {.i64=MODE_MERGE}, 0, MODE_NB-1, FLAGS, "mode"},
{"merge", "merge fields", 0, AV_OPT_TYPE_CONST, {.i64=MODE_MERGE}, INT_MIN, INT_MAX, FLAGS, "mode"},
{"drop_even", "drop even fields", 0, AV_OPT_TYPE_CONST, {.i64=MODE_DROP_EVEN}, INT_MIN, INT_MAX, FLAGS, "mode"},
{"drop_odd", "drop odd fields", 0, AV_OPT_TYPE_CONST, {.i64=MODE_DROP_ODD}, INT_MIN, INT_MAX, FLAGS, "mode"},
{"pad", "pad alternate lines with black", 0, AV_OPT_TYPE_CONST, {.i64=MODE_PAD}, INT_MIN, INT_MAX, FLAGS, "mode"},
{"interleave_top", "interleave top and bottom fields", 0, AV_OPT_TYPE_CONST, {.i64=MODE_INTERLEAVE_TOP}, INT_MIN, INT_MAX, FLAGS, "mode"},
{"interleave_bottom", "interleave bottom and top fields", 0, AV_OPT_TYPE_CONST, {.i64=MODE_INTERLEAVE_BOTTOM}, INT_MIN, INT_MAX, FLAGS, "mode"},
{"interlacex2", "interlace fields from two consecutive frames", 0, AV_OPT_TYPE_CONST, {.i64=MODE_INTERLACEX2}, INT_MIN, INT_MAX, FLAGS, "mode"},
{"mergex2", "merge fields keeping same frame rate", 0, AV_OPT_TYPE_CONST, {.i64=MODE_MERGEX2}, INT_MIN, INT_MAX, FLAGS, "mode"},
{"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" },
{"complex_filter", "enable complex vertical low-pass filter", 0, AV_OPT_TYPE_CONST, {.i64 = TINTERLACE_FLAG_CVLPF},INT_MIN, INT_MAX, FLAGS, "flags" },
{"cvlpf", "enable complex vertical low-pass filter", 0, AV_OPT_TYPE_CONST, {.i64 = TINTERLACE_FLAG_CVLPF},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" },
{"bypass_il", "bypass already interlaced frames", 0, AV_OPT_TYPE_CONST, {.i64 = TINTERLACE_FLAG_BYPASS_IL}, INT_MIN, INT_MAX, FLAGS, "flags" },
{NULL}
};
AVFILTER_DEFINE_CLASS(tinterlace);
static const AVOption interlace_options[] = {
{ "scan", "scanning mode", OFFSET(mode), AV_OPT_TYPE_INT, {.i64 = MODE_TFF}, 0, 1, FLAGS, "mode"},
{ "tff", "top field first", 0, AV_OPT_TYPE_CONST, {.i64 = MODE_TFF}, INT_MIN, INT_MAX, FLAGS, .unit = "mode"},
{ "bff", "bottom field first", 0, AV_OPT_TYPE_CONST, {.i64 = MODE_BFF}, INT_MIN, INT_MAX, FLAGS, .unit = "mode"},
{ "lowpass", "set vertical low-pass filter", OFFSET(lowpass), AV_OPT_TYPE_INT, {.i64 = VLPF_LIN}, 0, 2, FLAGS, "lowpass" },
{ "off", "disable vertical low-pass filter", 0, AV_OPT_TYPE_CONST, {.i64 = VLPF_OFF}, INT_MIN, INT_MAX, FLAGS, "lowpass" },
{ "linear", "linear vertical low-pass filter", 0, AV_OPT_TYPE_CONST, {.i64 = VLPF_LIN}, INT_MIN, INT_MAX, FLAGS, "lowpass" },
{ "complex", "complex vertical low-pass filter", 0, AV_OPT_TYPE_CONST, {.i64 = VLPF_CMP}, INT_MIN, INT_MAX, FLAGS, "lowpass" },
{ NULL }
};
AVFILTER_DEFINE_CLASS(interlace);
#define FULL_SCALE_YUVJ_FORMATS \
AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ440P
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 const enum AVPixelFormat pix_fmts[] = {
AV_PIX_FMT_YUV410P, AV_PIX_FMT_YUV411P,
AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV422P,
AV_PIX_FMT_YUV440P, AV_PIX_FMT_YUV444P,
AV_PIX_FMT_YUV420P10LE, AV_PIX_FMT_YUV422P10LE,
AV_PIX_FMT_YUV440P10LE, AV_PIX_FMT_YUV444P10LE,
AV_PIX_FMT_YUV420P12LE, AV_PIX_FMT_YUV422P12LE,
AV_PIX_FMT_YUV440P12LE, AV_PIX_FMT_YUV444P12LE,
AV_PIX_FMT_YUVA420P, AV_PIX_FMT_YUVA422P, AV_PIX_FMT_YUVA444P,
AV_PIX_FMT_YUVA420P10LE, AV_PIX_FMT_YUVA422P10LE, AV_PIX_FMT_YUVA444P10LE,
AV_PIX_FMT_GRAY8, FULL_SCALE_YUVJ_FORMATS,
AV_PIX_FMT_NONE
};
static void lowpass_line_c(uint8_t *dstp, ptrdiff_t width, const uint8_t *srcp,
ptrdiff_t mref, ptrdiff_t pref, int clip_max)
{
const uint8_t *srcp_above = srcp + mref;
const uint8_t *srcp_below = srcp + pref;
int i;
for (i = 0; i < width; 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 void lowpass_line_c_16(uint8_t *dst8, ptrdiff_t width, const uint8_t *src8,
ptrdiff_t mref, ptrdiff_t pref, int clip_max)
{
uint16_t *dstp = (uint16_t *)dst8;
const uint16_t *srcp = (const uint16_t *)src8;
const uint16_t *srcp_above = srcp + mref / 2;
const uint16_t *srcp_below = srcp + pref / 2;
int i, src_x;
for (i = 0; i < width; i++) {
// this calculation is an integer representation of
// '0.5 * current + 0.25 * above + 0.25 * below'
// '1 +' is for rounding.
src_x = av_le2ne16(srcp[i]) << 1;
dstp[i] = av_le2ne16((1 + src_x + av_le2ne16(srcp_above[i])
+ av_le2ne16(srcp_below[i])) >> 2);
}
}
static void lowpass_line_complex_c(uint8_t *dstp, ptrdiff_t width, const uint8_t *srcp,
ptrdiff_t mref, ptrdiff_t pref, int clip_max)
{
const uint8_t *srcp_above = srcp + mref;
const uint8_t *srcp_below = srcp + pref;
const uint8_t *srcp_above2 = srcp + mref * 2;
const uint8_t *srcp_below2 = srcp + pref * 2;
int i, src_x, src_ab;
for (i = 0; i < width; i++) {
// this calculation is an integer representation of
// '0.75 * current + 0.25 * above + 0.25 * below - 0.125 * above2 - 0.125 * below2'
// '4 +' is for rounding.
src_x = srcp[i] << 1;
src_ab = srcp_above[i] + srcp_below[i];
dstp[i] = av_clip_uint8((4 + ((srcp[i] + src_x + src_ab) << 1)
- srcp_above2[i] - srcp_below2[i]) >> 3);
// Prevent over-sharpening:
// dst must not exceed src when the average of above and below
// is less than src. And the other way around.
if (src_ab > src_x) {
if (dstp[i] < srcp[i])
dstp[i] = srcp[i];
} else if (dstp[i] > srcp[i])
dstp[i] = srcp[i];
}
}
static void lowpass_line_complex_c_16(uint8_t *dst8, ptrdiff_t width, const uint8_t *src8,
ptrdiff_t mref, ptrdiff_t pref, int clip_max)
{
uint16_t *dstp = (uint16_t *)dst8;
const uint16_t *srcp = (const uint16_t *)src8;
const uint16_t *srcp_above = srcp + mref / 2;
const uint16_t *srcp_below = srcp + pref / 2;
const uint16_t *srcp_above2 = srcp + mref;
const uint16_t *srcp_below2 = srcp + pref;
int i, dst_le, src_le, src_x, src_ab;
for (i = 0; i < width; i++) {
// this calculation is an integer representation of
// '0.75 * current + 0.25 * above + 0.25 * below - 0.125 * above2 - 0.125 * below2'
// '4 +' is for rounding.
src_le = av_le2ne16(srcp[i]);
src_x = src_le << 1;
src_ab = av_le2ne16(srcp_above[i]) + av_le2ne16(srcp_below[i]);
dst_le = av_clip((4 + ((src_le + src_x + src_ab) << 1)
- av_le2ne16(srcp_above2[i])
- av_le2ne16(srcp_below2[i])) >> 3, 0, clip_max);
// Prevent over-sharpening:
// dst must not exceed src when the average of above and below
// is less than src. And the other way around.
if (src_ab > src_x) {
if (dst_le < src_le)
dstp[i] = av_le2ne16(src_le);
else
dstp[i] = av_le2ne16(dst_le);
} else if (dst_le > src_le) {
dstp[i] = av_le2ne16(src_le);
} else
dstp[i] = av_le2ne16(dst_le);
}
}
static av_cold void uninit(AVFilterContext *ctx)
{
TInterlaceContext *tinterlace = ctx->priv;
av_frame_free(&tinterlace->cur );
av_frame_free(&tinterlace->next);
av_freep(&tinterlace->black_data[0][0]);
av_freep(&tinterlace->black_data[1][0]);
}
static int config_out_props(AVFilterLink *outlink)
{
AVFilterContext *ctx = outlink->src;
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->w = inlink->w;
outlink->h = tinterlace->mode == MODE_MERGE || tinterlace->mode == MODE_PAD || tinterlace->mode == MODE_MERGEX2?
inlink->h*2 : inlink->h;
if (tinterlace->mode == MODE_MERGE || tinterlace->mode == MODE_PAD || tinterlace->mode == MODE_MERGEX2)
outlink->sample_aspect_ratio = av_mul_q(inlink->sample_aspect_ratio,
av_make_q(2, 1));
if (tinterlace->mode == MODE_PAD) {
uint8_t black[4] = { 0, 0, 0, 16 };
int ret;
ff_draw_init(&tinterlace->draw, outlink->format, 0);
ff_draw_color(&tinterlace->draw, &tinterlace->color, black);
/* limited range */
if (!ff_fmt_is_in(outlink->format, full_scale_yuvj_pix_fmts)) {
ret = av_image_alloc(tinterlace->black_data[0], tinterlace->black_linesize,
outlink->w, outlink->h, outlink->format, 16);
if (ret < 0)
return ret;
ff_fill_rectangle(&tinterlace->draw, &tinterlace->color, tinterlace->black_data[0],
tinterlace->black_linesize, 0, 0, outlink->w, outlink->h);
}
/* full range */
tinterlace->color.comp[0].u8[0] = 0;
ret = av_image_alloc(tinterlace->black_data[1], tinterlace->black_linesize,
outlink->w, outlink->h, outlink->format, 16);
if (ret < 0)
return ret;
ff_fill_rectangle(&tinterlace->draw, &tinterlace->color, tinterlace->black_data[1],
tinterlace->black_linesize, 0, 0, outlink->w, outlink->h);
}
if (tinterlace->flags & (TINTERLACE_FLAG_VLPF | TINTERLACE_FLAG_CVLPF)
&& !(tinterlace->mode == MODE_INTERLEAVE_TOP
|| tinterlace->mode == MODE_INTERLEAVE_BOTTOM)) {
av_log(ctx, AV_LOG_WARNING, "low_pass_filter flags ignored with mode %d\n",
tinterlace->mode);
tinterlace->flags &= ~(TINTERLACE_FLAG_VLPF | TINTERLACE_FLAG_CVLPF);
}
tinterlace->preout_time_base = inlink->time_base;
if (tinterlace->mode == MODE_INTERLACEX2) {
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_MERGEX2) {
outlink->frame_rate = inlink->frame_rate;
outlink->time_base = inlink->time_base;
} 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;
tinterlace->csp = av_pix_fmt_desc_get(outlink->format);
if (tinterlace->flags & TINTERLACE_FLAG_CVLPF) {
if (tinterlace->csp->comp[0].depth > 8)
tinterlace->lowpass_line = lowpass_line_complex_c_16;
else
tinterlace->lowpass_line = lowpass_line_complex_c;
#if ARCH_X86
ff_tinterlace_init_x86(tinterlace);
#endif
} else if (tinterlace->flags & TINTERLACE_FLAG_VLPF) {
if (tinterlace->csp->comp[0].depth > 8)
tinterlace->lowpass_line = lowpass_line_c_16;
else
tinterlace->lowpass_line = lowpass_line_c;
#if ARCH_X86
ff_tinterlace_init_x86(tinterlace);
#endif
}
av_log(ctx, AV_LOG_VERBOSE, "mode:%d filter:%s h:%d -> h:%d\n", tinterlace->mode,
(tinterlace->flags & TINTERLACE_FLAG_CVLPF) ? "complex" :
(tinterlace->flags & TINTERLACE_FLAG_VLPF) ? "linear" : "off",
inlink->h, outlink->h);
return 0;
}
#define FIELD_UPPER 0
#define FIELD_LOWER 1
#define FIELD_UPPER_AND_LOWER 2
/**
* Copy picture field from src to dst.
*
* @param src_field copy from upper, lower field or both
* @param interleave leave a padding line between each copied line
* @param dst_field copy to upper or lower field,
* only meaningful when interleave is selected
* @param flags context flags
*/
static inline
void copy_picture_field(TInterlaceContext *tinterlace,
uint8_t *dst[4], int dst_linesize[4],
const uint8_t *src[4], int src_linesize[4],
enum AVPixelFormat format, int w, int src_h,
int src_field, int interleave, int dst_field,
int flags)
{
const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(format);
int hsub = desc->log2_chroma_w;
int plane, vsub = desc->log2_chroma_h;
int k = src_field == FIELD_UPPER_AND_LOWER ? 1 : 2;
int h;
for (plane = 0; plane < desc->nb_components; plane++) {
int lines = plane == 1 || plane == 2 ? AV_CEIL_RSHIFT(src_h, vsub) : src_h;
int cols = plane == 1 || plane == 2 ? AV_CEIL_RSHIFT( w, hsub) : w;
uint8_t *dstp = dst[plane];
const uint8_t *srcp = src[plane];
int srcp_linesize = src_linesize[plane] * k;
int dstp_linesize = dst_linesize[plane] * (interleave ? 2 : 1);
int clip_max = (1 << tinterlace->csp->comp[plane].depth) - 1;
lines = (lines + (src_field == FIELD_UPPER)) / k;
if (src_field == FIELD_LOWER)
srcp += src_linesize[plane];
if (interleave && dst_field == FIELD_LOWER)
dstp += dst_linesize[plane];
// Low-pass filtering is required when creating an interlaced destination from
// a progressive source which contains high-frequency vertical detail.
// Filtering will reduce interlace 'twitter' and Moire patterning.
if (flags & (TINTERLACE_FLAG_VLPF | TINTERLACE_FLAG_CVLPF)) {
int x = !!(flags & TINTERLACE_FLAG_CVLPF);
for (h = lines; h > 0; h--) {
ptrdiff_t pref = src_linesize[plane];
ptrdiff_t mref = -pref;
if (h >= (lines - x)) mref = 0; // there is no line above
else if (h <= (1 + x)) pref = 0; // there is no line below
tinterlace->lowpass_line(dstp, cols, srcp, mref, pref, clip_max);
dstp += dstp_linesize;
srcp += srcp_linesize;
}
} else {
if (tinterlace->csp->comp[plane].depth > 8)
cols *= 2;
av_image_copy_plane(dstp, dstp_linesize, srcp, srcp_linesize, cols, lines);
}
}
}
static int filter_frame(AVFilterLink *inlink, AVFrame *picref)
{
AVFilterContext *ctx = inlink->dst;
AVFilterLink *outlink = ctx->outputs[0];
TInterlaceContext *tinterlace = ctx->priv;
AVFrame *cur, *next, *out;
int field, tff, full, ret;
av_frame_free(&tinterlace->cur);
tinterlace->cur = tinterlace->next;
tinterlace->next = picref;
cur = tinterlace->cur;
next = tinterlace->next;
/* we need at least two frames */
if (!tinterlace->cur)
return 0;
switch (tinterlace->mode) {
case MODE_MERGEX2: /* move the odd frame into the upper field of the new image, even into
* the lower field, generating a double-height video at same framerate */
case MODE_MERGE: /* move the odd frame into the upper field of the new image, even into
* the lower field, generating a double-height video at half framerate */
out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
if (!out)
return AVERROR(ENOMEM);
av_frame_copy_props(out, cur);
out->height = outlink->h;
out->interlaced_frame = 1;
out->top_field_first = 1;
out->sample_aspect_ratio = av_mul_q(cur->sample_aspect_ratio, av_make_q(2, 1));
/* write odd frame lines into the upper field of the new frame */
copy_picture_field(tinterlace, out->data, out->linesize,
(const uint8_t **)cur->data, cur->linesize,
inlink->format, inlink->w, inlink->h,
FIELD_UPPER_AND_LOWER, 1, tinterlace->mode == MODE_MERGEX2 ? (1 + inlink->frame_count_out) & 1 ? FIELD_LOWER : FIELD_UPPER : FIELD_UPPER, tinterlace->flags);
/* write even frame lines into the lower field of the new frame */
copy_picture_field(tinterlace, out->data, out->linesize,
(const uint8_t **)next->data, next->linesize,
inlink->format, inlink->w, inlink->h,
FIELD_UPPER_AND_LOWER, 1, tinterlace->mode == MODE_MERGEX2 ? (1 + inlink->frame_count_out) & 1 ? FIELD_UPPER : FIELD_LOWER : FIELD_LOWER, tinterlace->flags);
if (tinterlace->mode != MODE_MERGEX2)
av_frame_free(&tinterlace->next);
break;
case MODE_DROP_ODD: /* only output even frames, odd frames are dropped; height unchanged, half framerate */
case MODE_DROP_EVEN: /* only output odd frames, even frames are dropped; height unchanged, half framerate */
out = av_frame_clone(tinterlace->mode == MODE_DROP_EVEN ? cur : next);
if (!out)
return AVERROR(ENOMEM);
av_frame_free(&tinterlace->next);
break;
case MODE_PAD: /* expand each frame to double height, but pad alternate
* lines with black; framerate unchanged */
out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
if (!out)
return AVERROR(ENOMEM);
av_frame_copy_props(out, cur);
out->height = outlink->h;
out->sample_aspect_ratio = av_mul_q(cur->sample_aspect_ratio, av_make_q(2, 1));
field = (1 + outlink->frame_count_in) & 1 ? FIELD_UPPER : FIELD_LOWER;
full = out->color_range == AVCOL_RANGE_JPEG || ff_fmt_is_in(out->format, full_scale_yuvj_pix_fmts);
/* copy upper and lower fields */
copy_picture_field(tinterlace, out->data, out->linesize,
(const uint8_t **)cur->data, cur->linesize,
inlink->format, inlink->w, inlink->h,
FIELD_UPPER_AND_LOWER, 1, field, tinterlace->flags);
/* pad with black the other field */
copy_picture_field(tinterlace, out->data, out->linesize,
(const uint8_t **)tinterlace->black_data[full], tinterlace->black_linesize,
inlink->format, inlink->w, inlink->h,
FIELD_UPPER_AND_LOWER, 1, !field, tinterlace->flags);
break;
/* interleave upper/lower lines from odd frames with lower/upper lines from even frames,
* halving the frame rate and preserving image height */
case MODE_INTERLEAVE_TOP: /* top field first */
case MODE_INTERLEAVE_BOTTOM: /* bottom field first */
if ((tinterlace->flags & TINTERLACE_FLAG_BYPASS_IL) && cur->interlaced_frame) {
av_log(ctx, AV_LOG_WARNING,
"video is already interlaced, adjusting framerate only\n");
out = av_frame_clone(cur);
if (!out)
return AVERROR(ENOMEM);
out->pts /= 2; // adjust pts to new framerate
ret = ff_filter_frame(outlink, out);
return ret;
}
tff = tinterlace->mode == MODE_INTERLEAVE_TOP;
out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
if (!out)
return AVERROR(ENOMEM);
av_frame_copy_props(out, cur);
out->interlaced_frame = 1;
out->top_field_first = tff;
/* copy upper/lower field from cur */
copy_picture_field(tinterlace, out->data, out->linesize,
(const uint8_t **)cur->data, cur->linesize,
inlink->format, inlink->w, inlink->h,
tff ? FIELD_UPPER : FIELD_LOWER, 1, tff ? FIELD_UPPER : FIELD_LOWER,
tinterlace->flags);
/* copy lower/upper field from next */
copy_picture_field(tinterlace, out->data, out->linesize,
(const uint8_t **)next->data, next->linesize,
inlink->format, inlink->w, inlink->h,
tff ? FIELD_LOWER : FIELD_UPPER, 1, tff ? FIELD_LOWER : FIELD_UPPER,
tinterlace->flags);
av_frame_free(&tinterlace->next);
break;
case MODE_INTERLACEX2: /* re-interlace preserving image height, double frame rate */
/* output current frame first */
out = av_frame_clone(cur);
if (!out)
return AVERROR(ENOMEM);
out->interlaced_frame = 1;
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;
/* output mix of current and next frame */
tff = next->top_field_first;
out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
if (!out)
return AVERROR(ENOMEM);
av_frame_copy_props(out, next);
out->interlaced_frame = 1;
out->top_field_first = !tff;
if (next->pts != AV_NOPTS_VALUE && cur->pts != AV_NOPTS_VALUE)
out->pts = cur->pts + next->pts;
else
out->pts = AV_NOPTS_VALUE;
/* write current frame second field lines into the second field of the new frame */
copy_picture_field(tinterlace, out->data, out->linesize,
(const uint8_t **)cur->data, cur->linesize,
inlink->format, inlink->w, inlink->h,
tff ? FIELD_LOWER : FIELD_UPPER, 1, tff ? FIELD_LOWER : FIELD_UPPER,
tinterlace->flags);
/* write next frame first field lines into the first field of the new frame */
copy_picture_field(tinterlace, out->data, out->linesize,
(const uint8_t **)next->data, next->linesize,
inlink->format, inlink->w, inlink->h,
tff ? FIELD_UPPER : FIELD_LOWER, 1, tff ? FIELD_UPPER : FIELD_LOWER,
tinterlace->flags);
break;
default:
av_assert0(0);
}
out->pts = av_rescale_q(out->pts, tinterlace->preout_time_base, outlink->time_base);
out->duration = av_rescale_q(1, av_inv_q(outlink->frame_rate), outlink->time_base);
ret = ff_filter_frame(outlink, out);
return ret;
}
static int init_interlace(AVFilterContext *ctx)
{
TInterlaceContext *tinterlace = ctx->priv;
if (tinterlace->mode <= MODE_BFF)
tinterlace->mode += MODE_INTERLEAVE_TOP;
tinterlace->flags |= TINTERLACE_FLAG_BYPASS_IL;
if (tinterlace->lowpass == VLPF_LIN)
tinterlace->flags |= TINTERLACE_FLAG_VLPF;
if (tinterlace->lowpass == VLPF_CMP)
tinterlace->flags |= TINTERLACE_FLAG_CVLPF;
return 0;
}
static const AVFilterPad tinterlace_inputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.filter_frame = filter_frame,
},
};
static const AVFilterPad tinterlace_outputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.config_props = config_out_props,
},
};
const AVFilter ff_vf_tinterlace = {
.name = "tinterlace",
.description = NULL_IF_CONFIG_SMALL("Perform temporal field interlacing."),
.priv_size = sizeof(TInterlaceContext),
.uninit = uninit,
FILTER_INPUTS(tinterlace_inputs),
FILTER_OUTPUTS(tinterlace_outputs),
FILTER_PIXFMTS_ARRAY(pix_fmts),
.priv_class = &tinterlace_class,
};
const AVFilter ff_vf_interlace = {
.name = "interlace",
.description = NULL_IF_CONFIG_SMALL("Convert progressive video into interlaced."),
.priv_size = sizeof(TInterlaceContext),
.init = init_interlace,
.uninit = uninit,
FILTER_INPUTS(tinterlace_inputs),
FILTER_OUTPUTS(tinterlace_outputs),
FILTER_PIXFMTS_ARRAY(pix_fmts),
.priv_class = &interlace_class,
};
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