0,0 → 1,394 |
/* |
* Copyright (C) 2012 British Broadcasting Corporation, All Rights Reserved |
* Author of de-interlace algorithm: Jim Easterbrook for BBC R&D |
* Based on the process described by Martin Weston for BBC R&D |
* Author of FFmpeg filter: Mark Himsley for BBC Broadcast Systems Development |
* |
* This file is part of FFmpeg. |
* |
* FFmpeg is free software; you can redistribute it and/or |
* modify it under the terms of the GNU Lesser General Public |
* License as published by the Free Software Foundation; either |
* version 2.1 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 |
* Lesser General Public License for more details. |
* |
* You should have received a copy of the GNU Lesser 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 |
*/ |
|
#include "libavutil/common.h" |
#include "libavutil/imgutils.h" |
#include "libavutil/opt.h" |
#include "libavutil/pixdesc.h" |
#include "avfilter.h" |
#include "formats.h" |
#include "internal.h" |
#include "video.h" |
|
typedef struct W3FDIFContext { |
const AVClass *class; |
int filter; ///< 0 is simple, 1 is more complex |
int deint; ///< which frames to deinterlace |
int linesize[4]; ///< bytes of pixel data per line for each plane |
int planeheight[4]; ///< height of each plane |
int field; ///< which field are we on, 0 or 1 |
int eof; |
int nb_planes; |
AVFrame *prev, *cur, *next; ///< previous, current, next frames |
int32_t *work_line; ///< line we are calculating |
} W3FDIFContext; |
|
#define OFFSET(x) offsetof(W3FDIFContext, x) |
#define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM |
#define CONST(name, help, val, unit) { name, help, 0, AV_OPT_TYPE_CONST, {.i64=val}, 0, 0, FLAGS, unit } |
|
static const AVOption w3fdif_options[] = { |
{ "filter", "specify the filter", OFFSET(filter), AV_OPT_TYPE_INT, {.i64=1}, 0, 1, FLAGS, "filter" }, |
CONST("simple", NULL, 0, "filter"), |
CONST("complex", NULL, 1, "filter"), |
{ "deint", "specify which frames to deinterlace", OFFSET(deint), AV_OPT_TYPE_INT, {.i64=0}, 0, 1, FLAGS, "deint" }, |
CONST("all", "deinterlace all frames", 0, "deint"), |
CONST("interlaced", "only deinterlace frames marked as interlaced", 1, "deint"), |
{ NULL } |
}; |
|
AVFILTER_DEFINE_CLASS(w3fdif); |
|
static int query_formats(AVFilterContext *ctx) |
{ |
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_YUVJ444P, AV_PIX_FMT_YUVJ440P, |
AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVJ420P, |
AV_PIX_FMT_YUVJ411P, |
AV_PIX_FMT_YUVA420P, AV_PIX_FMT_YUVA422P, AV_PIX_FMT_YUVA444P, |
AV_PIX_FMT_GBRP, AV_PIX_FMT_GBRAP, |
AV_PIX_FMT_GRAY8, |
AV_PIX_FMT_NONE |
}; |
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ff_set_common_formats(ctx, ff_make_format_list(pix_fmts)); |
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return 0; |
} |
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static int config_input(AVFilterLink *inlink) |
{ |
W3FDIFContext *s = inlink->dst->priv; |
const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format); |
int ret; |
|
if ((ret = av_image_fill_linesizes(s->linesize, inlink->format, inlink->w)) < 0) |
return ret; |
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s->planeheight[1] = s->planeheight[2] = FF_CEIL_RSHIFT(inlink->h, desc->log2_chroma_h); |
s->planeheight[0] = s->planeheight[3] = inlink->h; |
|
s->nb_planes = av_pix_fmt_count_planes(inlink->format); |
s->work_line = av_calloc(s->linesize[0], sizeof(*s->work_line)); |
if (!s->work_line) |
return AVERROR(ENOMEM); |
|
return 0; |
} |
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static int config_output(AVFilterLink *outlink) |
{ |
AVFilterLink *inlink = outlink->src->inputs[0]; |
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outlink->time_base.num = inlink->time_base.num; |
outlink->time_base.den = inlink->time_base.den * 2; |
outlink->frame_rate.num = inlink->frame_rate.num * 2; |
outlink->frame_rate.den = inlink->frame_rate.den; |
outlink->flags |= FF_LINK_FLAG_REQUEST_LOOP; |
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return 0; |
} |
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/* |
* Filter coefficients from PH-2071, scaled by 256 * 256. |
* Each set of coefficients has a set for low-frequencies and high-frequencies. |
* n_coef_lf[] and n_coef_hf[] are the number of coefs for simple and more-complex. |
* It is important for later that n_coef_lf[] is even and n_coef_hf[] is odd. |
* coef_lf[][] and coef_hf[][] are the coefficients for low-frequencies |
* and high-frequencies for simple and more-complex mode. |
*/ |
static const int8_t n_coef_lf[2] = { 2, 4 }; |
static const int32_t coef_lf[2][4] = {{ 32768, 32768, 0, 0}, |
{ -1704, 34472, 34472, -1704}}; |
static const int8_t n_coef_hf[2] = { 3, 5 }; |
static const int32_t coef_hf[2][5] = {{ -4096, 8192, -4096, 0, 0}, |
{ 2032, -7602, 11140, -7602, 2032}}; |
|
static void deinterlace_plane(AVFilterContext *ctx, AVFrame *out, |
const AVFrame *cur, const AVFrame *adj, |
const int filter, const int plane) |
{ |
W3FDIFContext *s = ctx->priv; |
uint8_t *in_line, *in_lines_cur[5], *in_lines_adj[5]; |
uint8_t *out_line, *out_pixel; |
int32_t *work_line, *work_pixel; |
uint8_t *cur_data = cur->data[plane]; |
uint8_t *adj_data = adj->data[plane]; |
uint8_t *dst_data = out->data[plane]; |
const int linesize = s->linesize[plane]; |
const int height = s->planeheight[plane]; |
const int cur_line_stride = cur->linesize[plane]; |
const int adj_line_stride = adj->linesize[plane]; |
const int dst_line_stride = out->linesize[plane]; |
int i, j, y_in, y_out; |
|
/* copy unchanged the lines of the field */ |
y_out = s->field == cur->top_field_first; |
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in_line = cur_data + (y_out * cur_line_stride); |
out_line = dst_data + (y_out * dst_line_stride); |
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while (y_out < height) { |
memcpy(out_line, in_line, linesize); |
y_out += 2; |
in_line += cur_line_stride * 2; |
out_line += dst_line_stride * 2; |
} |
|
/* interpolate other lines of the field */ |
y_out = s->field != cur->top_field_first; |
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out_line = dst_data + (y_out * dst_line_stride); |
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while (y_out < height) { |
/* clear workspace */ |
memset(s->work_line, 0, sizeof(*s->work_line) * linesize); |
|
/* get low vertical frequencies from current field */ |
for (j = 0; j < n_coef_lf[filter]; j++) { |
y_in = (y_out + 1) + (j * 2) - n_coef_lf[filter]; |
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while (y_in < 0) |
y_in += 2; |
while (y_in >= height) |
y_in -= 2; |
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in_lines_cur[j] = cur_data + (y_in * cur_line_stride); |
} |
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work_line = s->work_line; |
switch (n_coef_lf[filter]) { |
case 2: |
for (i = 0; i < linesize; i++) { |
*work_line += *in_lines_cur[0]++ * coef_lf[filter][0]; |
*work_line++ += *in_lines_cur[1]++ * coef_lf[filter][1]; |
} |
break; |
case 4: |
for (i = 0; i < linesize; i++) { |
*work_line += *in_lines_cur[0]++ * coef_lf[filter][0]; |
*work_line += *in_lines_cur[1]++ * coef_lf[filter][1]; |
*work_line += *in_lines_cur[2]++ * coef_lf[filter][2]; |
*work_line++ += *in_lines_cur[3]++ * coef_lf[filter][3]; |
} |
} |
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/* get high vertical frequencies from adjacent fields */ |
for (j = 0; j < n_coef_hf[filter]; j++) { |
y_in = (y_out + 1) + (j * 2) - n_coef_hf[filter]; |
|
while (y_in < 0) |
y_in += 2; |
while (y_in >= height) |
y_in -= 2; |
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in_lines_cur[j] = cur_data + (y_in * cur_line_stride); |
in_lines_adj[j] = adj_data + (y_in * adj_line_stride); |
} |
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work_line = s->work_line; |
switch (n_coef_hf[filter]) { |
case 3: |
for (i = 0; i < linesize; i++) { |
*work_line += *in_lines_cur[0]++ * coef_hf[filter][0]; |
*work_line += *in_lines_adj[0]++ * coef_hf[filter][0]; |
*work_line += *in_lines_cur[1]++ * coef_hf[filter][1]; |
*work_line += *in_lines_adj[1]++ * coef_hf[filter][1]; |
*work_line += *in_lines_cur[2]++ * coef_hf[filter][2]; |
*work_line++ += *in_lines_adj[2]++ * coef_hf[filter][2]; |
} |
break; |
case 5: |
for (i = 0; i < linesize; i++) { |
*work_line += *in_lines_cur[0]++ * coef_hf[filter][0]; |
*work_line += *in_lines_adj[0]++ * coef_hf[filter][0]; |
*work_line += *in_lines_cur[1]++ * coef_hf[filter][1]; |
*work_line += *in_lines_adj[1]++ * coef_hf[filter][1]; |
*work_line += *in_lines_cur[2]++ * coef_hf[filter][2]; |
*work_line += *in_lines_adj[2]++ * coef_hf[filter][2]; |
*work_line += *in_lines_cur[3]++ * coef_hf[filter][3]; |
*work_line += *in_lines_adj[3]++ * coef_hf[filter][3]; |
*work_line += *in_lines_cur[4]++ * coef_hf[filter][4]; |
*work_line++ += *in_lines_adj[4]++ * coef_hf[filter][4]; |
} |
} |
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/* save scaled result to the output frame, scaling down by 256 * 256 */ |
work_pixel = s->work_line; |
out_pixel = out_line; |
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for (j = 0; j < linesize; j++, out_pixel++, work_pixel++) |
*out_pixel = av_clip(*work_pixel, 0, 255 * 256 * 256) >> 16; |
|
/* move on to next line */ |
y_out += 2; |
out_line += dst_line_stride * 2; |
} |
} |
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static int filter(AVFilterContext *ctx, int is_second) |
{ |
W3FDIFContext *s = ctx->priv; |
AVFilterLink *outlink = ctx->outputs[0]; |
AVFrame *out, *adj; |
int plane; |
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out = ff_get_video_buffer(outlink, outlink->w, outlink->h); |
if (!out) |
return AVERROR(ENOMEM); |
av_frame_copy_props(out, s->cur); |
out->interlaced_frame = 0; |
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if (!is_second) { |
if (out->pts != AV_NOPTS_VALUE) |
out->pts *= 2; |
} else { |
int64_t cur_pts = s->cur->pts; |
int64_t next_pts = s->next->pts; |
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if (next_pts != AV_NOPTS_VALUE && cur_pts != AV_NOPTS_VALUE) { |
out->pts = cur_pts + next_pts; |
} else { |
out->pts = AV_NOPTS_VALUE; |
} |
} |
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adj = s->field ? s->next : s->prev; |
for (plane = 0; plane < s->nb_planes; plane++) |
deinterlace_plane(ctx, out, s->cur, adj, s->filter, plane); |
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s->field = !s->field; |
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return ff_filter_frame(outlink, out); |
} |
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static int filter_frame(AVFilterLink *inlink, AVFrame *frame) |
{ |
AVFilterContext *ctx = inlink->dst; |
W3FDIFContext *s = ctx->priv; |
int ret; |
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av_frame_free(&s->prev); |
s->prev = s->cur; |
s->cur = s->next; |
s->next = frame; |
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if (!s->cur) { |
s->cur = av_frame_clone(s->next); |
if (!s->cur) |
return AVERROR(ENOMEM); |
} |
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if ((s->deint && !s->cur->interlaced_frame) || ctx->is_disabled) { |
AVFrame *out = av_frame_clone(s->cur); |
if (!out) |
return AVERROR(ENOMEM); |
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av_frame_free(&s->prev); |
if (out->pts != AV_NOPTS_VALUE) |
out->pts *= 2; |
return ff_filter_frame(ctx->outputs[0], out); |
} |
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if (!s->prev) |
return 0; |
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ret = filter(ctx, 0); |
if (ret < 0) |
return ret; |
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return filter(ctx, 1); |
} |
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static int request_frame(AVFilterLink *outlink) |
{ |
AVFilterContext *ctx = outlink->src; |
W3FDIFContext *s = ctx->priv; |
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do { |
int ret; |
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if (s->eof) |
return AVERROR_EOF; |
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ret = ff_request_frame(ctx->inputs[0]); |
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if (ret == AVERROR_EOF && s->cur) { |
AVFrame *next = av_frame_clone(s->next); |
if (!next) |
return AVERROR(ENOMEM); |
next->pts = s->next->pts * 2 - s->cur->pts; |
filter_frame(ctx->inputs[0], next); |
s->eof = 1; |
} else if (ret < 0) { |
return ret; |
} |
} while (!s->cur); |
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return 0; |
} |
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static av_cold void uninit(AVFilterContext *ctx) |
{ |
W3FDIFContext *s = ctx->priv; |
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av_frame_free(&s->prev); |
av_frame_free(&s->cur ); |
av_frame_free(&s->next); |
av_freep(&s->work_line); |
} |
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static const AVFilterPad w3fdif_inputs[] = { |
{ |
.name = "default", |
.type = AVMEDIA_TYPE_VIDEO, |
.filter_frame = filter_frame, |
.config_props = config_input, |
}, |
{ NULL } |
}; |
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static const AVFilterPad w3fdif_outputs[] = { |
{ |
.name = "default", |
.type = AVMEDIA_TYPE_VIDEO, |
.config_props = config_output, |
.request_frame = request_frame, |
}, |
{ NULL } |
}; |
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AVFilter avfilter_vf_w3fdif = { |
.name = "w3fdif", |
.description = NULL_IF_CONFIG_SMALL("Apply Martin Weston three field deinterlace."), |
.priv_size = sizeof(W3FDIFContext), |
.priv_class = &w3fdif_class, |
.uninit = uninit, |
.query_formats = query_formats, |
.inputs = w3fdif_inputs, |
.outputs = w3fdif_outputs, |
.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_INTERNAL, |
}; |