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- /*
- * Copyright (c) 2012 Rudolf Polzer
- * Copyright (c) 2013 Paul B Mahol
- *
- * 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
- */
- /**
- * @file telecine filter, heavily based from mpv-player:TOOLS/vf_dlopen/telecine.c by
- * Rudolf Polzer.
- */
- #include "libavutil/avstring.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 {
- const AVClass *class;
- int first_field;
- char *pattern;
- unsigned int pattern_pos;
- int64_t start_time;
- AVRational pts;
- AVRational ts_unit;
- int out_cnt;
- int occupied;
- int nb_planes;
- int planeheight[4];
- int stride[4];
- AVFrame *frame[5];
- AVFrame *temp;
- } TelecineContext;
- #define OFFSET(x) offsetof(TelecineContext, x)
- #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
- static const AVOption telecine_options[] = {
- {"first_field", "select first field", OFFSET(first_field), AV_OPT_TYPE_INT, {.i64=0}, 0, 1, FLAGS, "field"},
- {"top", "select top field first", 0, AV_OPT_TYPE_CONST, {.i64=0}, 0, 0, FLAGS, "field"},
- {"t", "select top field first", 0, AV_OPT_TYPE_CONST, {.i64=0}, 0, 0, FLAGS, "field"},
- {"bottom", "select bottom field first", 0, AV_OPT_TYPE_CONST, {.i64=1}, 0, 0, FLAGS, "field"},
- {"b", "select bottom field first", 0, AV_OPT_TYPE_CONST, {.i64=1}, 0, 0, FLAGS, "field"},
- {"pattern", "pattern that describe for how many fields a frame is to be displayed", OFFSET(pattern), AV_OPT_TYPE_STRING, {.str="23"}, 0, 0, FLAGS},
- {NULL}
- };
- AVFILTER_DEFINE_CLASS(telecine);
- static av_cold int init(AVFilterContext *ctx)
- {
- TelecineContext *s = ctx->priv;
- const char *p;
- int max = 0;
- if (!strlen(s->pattern)) {
- av_log(ctx, AV_LOG_ERROR, "No pattern provided.\n");
- return AVERROR_INVALIDDATA;
- }
- for (p = s->pattern; *p; p++) {
- if (!av_isdigit(*p)) {
- av_log(ctx, AV_LOG_ERROR, "Provided pattern includes non-numeric characters.\n");
- return AVERROR_INVALIDDATA;
- }
- max = FFMAX(*p - '0', max);
- s->pts.num += 2;
- s->pts.den += *p - '0';
- }
- s->start_time = AV_NOPTS_VALUE;
- s->out_cnt = (max + 1) / 2;
- av_log(ctx, AV_LOG_INFO, "Telecine pattern %s yields up to %d frames per frame, pts advance factor: %d/%d\n",
- s->pattern, s->out_cnt, s->pts.num, s->pts.den);
- return 0;
- }
- static int query_formats(AVFilterContext *ctx)
- {
- AVFilterFormats *pix_fmts = NULL;
- int fmt, ret;
- for (fmt = 0; av_pix_fmt_desc_get(fmt); fmt++) {
- const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(fmt);
- if (!(desc->flags & AV_PIX_FMT_FLAG_HWACCEL ||
- desc->flags & AV_PIX_FMT_FLAG_PAL ||
- desc->flags & AV_PIX_FMT_FLAG_BITSTREAM) &&
- (ret = ff_add_format(&pix_fmts, fmt)) < 0)
- return ret;
- }
- return ff_set_common_formats(ctx, pix_fmts);
- }
- static int config_input(AVFilterLink *inlink)
- {
- TelecineContext *s = inlink->dst->priv;
- const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
- int i, ret;
- s->temp = ff_get_video_buffer(inlink, inlink->w, inlink->h);
- if (!s->temp)
- return AVERROR(ENOMEM);
- for (i = 0; i < s->out_cnt; i++) {
- s->frame[i] = ff_get_video_buffer(inlink, inlink->w, inlink->h);
- if (!s->frame[i])
- return AVERROR(ENOMEM);
- }
- if ((ret = av_image_fill_linesizes(s->stride, inlink->format, inlink->w)) < 0)
- return ret;
- s->planeheight[1] = s->planeheight[2] = AV_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);
- return 0;
- }
- static int config_output(AVFilterLink *outlink)
- {
- AVFilterContext *ctx = outlink->src;
- TelecineContext *s = ctx->priv;
- const AVFilterLink *inlink = ctx->inputs[0];
- AVRational fps = inlink->frame_rate;
- if (!fps.num || !fps.den) {
- av_log(ctx, AV_LOG_ERROR, "The input needs a constant frame rate; "
- "current rate of %d/%d is invalid\n", fps.num, fps.den);
- return AVERROR(EINVAL);
- }
- fps = av_mul_q(fps, av_inv_q(s->pts));
- av_log(ctx, AV_LOG_VERBOSE, "FPS: %d/%d -> %d/%d\n",
- inlink->frame_rate.num, inlink->frame_rate.den, fps.num, fps.den);
- outlink->frame_rate = fps;
- outlink->time_base = av_mul_q(inlink->time_base, s->pts);
- av_log(ctx, AV_LOG_VERBOSE, "TB: %d/%d -> %d/%d\n",
- inlink->time_base.num, inlink->time_base.den, outlink->time_base.num, outlink->time_base.den);
- s->ts_unit = av_inv_q(av_mul_q(fps, outlink->time_base));
- return 0;
- }
- static int filter_frame(AVFilterLink *inlink, AVFrame *inpicref)
- {
- AVFilterContext *ctx = inlink->dst;
- AVFilterLink *outlink = ctx->outputs[0];
- TelecineContext *s = ctx->priv;
- int i, len, ret = 0, nout = 0;
- if (s->start_time == AV_NOPTS_VALUE)
- s->start_time = inpicref->pts;
- len = s->pattern[s->pattern_pos] - '0';
- s->pattern_pos++;
- if (!s->pattern[s->pattern_pos])
- s->pattern_pos = 0;
- if (!len) { // do not output any field from this frame
- av_frame_free(&inpicref);
- return 0;
- }
- if (s->occupied) {
- av_frame_make_writable(s->frame[nout]);
- for (i = 0; i < s->nb_planes; i++) {
- // fill in the EARLIER field from the buffered pic
- av_image_copy_plane(s->frame[nout]->data[i] + s->frame[nout]->linesize[i] * s->first_field,
- s->frame[nout]->linesize[i] * 2,
- s->temp->data[i] + s->temp->linesize[i] * s->first_field,
- s->temp->linesize[i] * 2,
- s->stride[i],
- (s->planeheight[i] - s->first_field + 1) / 2);
- // fill in the LATER field from the new pic
- av_image_copy_plane(s->frame[nout]->data[i] + s->frame[nout]->linesize[i] * !s->first_field,
- s->frame[nout]->linesize[i] * 2,
- inpicref->data[i] + inpicref->linesize[i] * !s->first_field,
- inpicref->linesize[i] * 2,
- s->stride[i],
- (s->planeheight[i] - !s->first_field + 1) / 2);
- }
- nout++;
- len--;
- s->occupied = 0;
- }
- while (len >= 2) {
- // output THIS image as-is
- av_frame_make_writable(s->frame[nout]);
- for (i = 0; i < s->nb_planes; i++)
- av_image_copy_plane(s->frame[nout]->data[i], s->frame[nout]->linesize[i],
- inpicref->data[i], inpicref->linesize[i],
- s->stride[i],
- s->planeheight[i]);
- nout++;
- len -= 2;
- }
- if (len >= 1) {
- // copy THIS image to the buffer, we need it later
- for (i = 0; i < s->nb_planes; i++)
- av_image_copy_plane(s->temp->data[i], s->temp->linesize[i],
- inpicref->data[i], inpicref->linesize[i],
- s->stride[i],
- s->planeheight[i]);
- s->occupied = 1;
- }
- for (i = 0; i < nout; i++) {
- AVFrame *frame = av_frame_clone(s->frame[i]);
- if (!frame) {
- av_frame_free(&inpicref);
- return AVERROR(ENOMEM);
- }
- av_frame_copy_props(frame, inpicref);
- frame->pts = ((s->start_time == AV_NOPTS_VALUE) ? 0 : s->start_time) +
- av_rescale(outlink->frame_count, s->ts_unit.num,
- s->ts_unit.den);
- ret = ff_filter_frame(outlink, frame);
- }
- av_frame_free(&inpicref);
- return ret;
- }
- static av_cold void uninit(AVFilterContext *ctx)
- {
- TelecineContext *s = ctx->priv;
- int i;
- av_frame_free(&s->temp);
- for (i = 0; i < s->out_cnt; i++)
- av_frame_free(&s->frame[i]);
- }
- static const AVFilterPad telecine_inputs[] = {
- {
- .name = "default",
- .type = AVMEDIA_TYPE_VIDEO,
- .filter_frame = filter_frame,
- .config_props = config_input,
- },
- { NULL }
- };
- static const AVFilterPad telecine_outputs[] = {
- {
- .name = "default",
- .type = AVMEDIA_TYPE_VIDEO,
- .config_props = config_output,
- },
- { NULL }
- };
- AVFilter ff_vf_telecine = {
- .name = "telecine",
- .description = NULL_IF_CONFIG_SMALL("Apply a telecine pattern."),
- .priv_size = sizeof(TelecineContext),
- .priv_class = &telecine_class,
- .init = init,
- .uninit = uninit,
- .query_formats = query_formats,
- .inputs = telecine_inputs,
- .outputs = telecine_outputs,
- };
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