0,0 → 1,242 |
/* |
* Copyright (c) 2003 Michael Zucchi <notzed@ximian.com> |
* Copyright (c) 2010 Baptiste Coudurier |
* Copyright (c) 2011 Stefano Sabatini |
* Copyright (c) 2013 Vittorio Giovara <vittorio.giovara@gmail.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 |
* progressive to interlaced content filter, inspired by heavy debugging of tinterlace filter |
*/ |
|
#include "libavutil/common.h" |
#include "libavutil/opt.h" |
#include "libavutil/imgutils.h" |
#include "libavutil/avassert.h" |
|
#include "formats.h" |
#include "avfilter.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 |
} InterlaceContext; |
|
#define OFFSET(x) offsetof(InterlaceContext, x) |
#define V AV_OPT_FLAG_VIDEO_PARAM |
static const AVOption interlace_options[] = { |
{ "scan", "scanning mode", OFFSET(scan), |
AV_OPT_TYPE_INT, {.i64 = MODE_TFF }, 0, 1, .flags = V, .unit = "scan" }, |
{ "tff", "top field first", 0, |
AV_OPT_TYPE_CONST, {.i64 = MODE_TFF }, INT_MIN, INT_MAX, .flags = V, .unit = "scan" }, |
{ "bff", "bottom field first", 0, |
AV_OPT_TYPE_CONST, {.i64 = MODE_BFF }, INT_MIN, INT_MAX, .flags = V, .unit = "scan" }, |
{ "lowpass", "enable vertical low-pass filter", OFFSET(lowpass), |
AV_OPT_TYPE_INT, {.i64 = 1 }, 0, 1, .flags = V }, |
{ NULL } |
}; |
|
AVFILTER_DEFINE_CLASS(interlace); |
|
static const enum AVPixelFormat formats_supported[] = { |
AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV444P, |
AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUV410P, AV_PIX_FMT_YUVA420P, |
AV_PIX_FMT_GRAY8, AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ422P, |
AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ440P, AV_PIX_FMT_NONE |
}; |
|
static int query_formats(AVFilterContext *ctx) |
{ |
ff_set_common_formats(ctx, ff_make_format_list(formats_supported)); |
return 0; |
} |
|
static av_cold void uninit(AVFilterContext *ctx) |
{ |
InterlaceContext *s = ctx->priv; |
|
av_frame_free(&s->cur); |
av_frame_free(&s->next); |
} |
|
static int config_out_props(AVFilterLink *outlink) |
{ |
AVFilterContext *ctx = outlink->src; |
AVFilterLink *inlink = outlink->src->inputs[0]; |
InterlaceContext *s = ctx->priv; |
|
if (inlink->h < 2) { |
av_log(ctx, AV_LOG_ERROR, "input video height is too small\n"); |
return AVERROR_INVALIDDATA; |
} |
// 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; |
outlink->flags |= FF_LINK_FLAG_REQUEST_LOOP; |
|
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, |
AVFilterLink *inlink, enum FieldType field_type, |
int lowpass) |
{ |
const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format); |
int vsub = desc->log2_chroma_h; |
int plane, i, j; |
|
for (plane = 0; plane < desc->nb_components; plane++) { |
int lines = (plane == 1 || plane == 2) ? FF_CEIL_RSHIFT(inlink->h, vsub) : inlink->h; |
int linesize = av_image_get_linesize(inlink->format, inlink->w, plane); |
uint8_t *dstp = dst_frame->data[plane]; |
const uint8_t *srcp = src_frame->data[plane]; |
|
av_assert0(linesize >= 0); |
|
lines = (lines + (field_type == FIELD_UPPER)) / 2; |
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; |
for (j = lines; j > 0; j--) { |
const uint8_t *srcp_above = srcp - src_frame->linesize[plane]; |
const uint8_t *srcp_below = srcp + src_frame->linesize[plane]; |
if (j == lines) |
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; |
} |
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); |
} |
} |
} |
|
static int filter_frame(AVFilterLink *inlink, AVFrame *buf) |
{ |
AVFilterContext *ctx = inlink->dst; |
AVFilterLink *outlink = ctx->outputs[0]; |
InterlaceContext *s = ctx->priv; |
AVFrame *out; |
int tff, ret; |
|
av_frame_free(&s->cur); |
s->cur = s->next; |
s->next = buf; |
|
/* we need at least two frames */ |
if (!s->cur || !s->next) |
return 0; |
|
if (s->cur->interlaced_frame) { |
av_log(ctx, AV_LOG_WARNING, |
"video is already interlaced, adjusting framerate only\n"); |
out = av_frame_clone(s->cur); |
out->pts /= 2; // adjust pts to new framerate |
ret = ff_filter_frame(outlink, out); |
return ret; |
} |
|
tff = (s->scan == MODE_TFF); |
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 = 1; |
out->top_field_first = tff; |
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); |
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); |
av_frame_free(&s->next); |
|
ret = ff_filter_frame(outlink, out); |
|
return ret; |
} |
|
static const AVFilterPad inputs[] = { |
{ |
.name = "default", |
.type = AVMEDIA_TYPE_VIDEO, |
.filter_frame = filter_frame, |
}, |
{ NULL } |
}; |
|
static const AVFilterPad outputs[] = { |
{ |
.name = "default", |
.type = AVMEDIA_TYPE_VIDEO, |
.config_props = config_out_props, |
}, |
{ NULL } |
}; |
|
AVFilter avfilter_vf_interlace = { |
.name = "interlace", |
.description = NULL_IF_CONFIG_SMALL("Convert progressive video into interlaced."), |
.uninit = uninit, |
.priv_class = &interlace_class, |
.priv_size = sizeof(InterlaceContext), |
.query_formats = query_formats, |
.inputs = inputs, |
.outputs = outputs, |
}; |