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-rw-r--r--libavfilter/vf_telecine.c284
1 files changed, 284 insertions, 0 deletions
diff --git a/libavfilter/vf_telecine.c b/libavfilter/vf_telecine.c
new file mode 100644
index 0000000000..6e14548ca5
--- /dev/null
+++ b/libavfilter/vf_telecine.c
@@ -0,0 +1,284 @@
+/*
+ * 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;
+
+ AVRational pts;
+ double 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 *tc = ctx->priv;
+ const char *p;
+ int max = 0;
+
+ if (!strlen(tc->pattern)) {
+ av_log(ctx, AV_LOG_ERROR, "No pattern provided.\n");
+ return AVERROR_INVALIDDATA;
+ }
+
+ for (p = tc->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);
+ tc->pts.num += 2;
+ tc->pts.den += *p - '0';
+ }
+
+ tc->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",
+ tc->pattern, tc->out_cnt, tc->pts.num, tc->pts.den);
+
+ return 0;
+}
+
+static int query_formats(AVFilterContext *ctx)
+{
+ AVFilterFormats *pix_fmts = NULL;
+ int fmt;
+
+ for (fmt = 0; fmt < AV_PIX_FMT_NB; fmt++) {
+ const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(fmt);
+ if (!(desc->flags & AV_PIX_FMT_FLAG_HWACCEL))
+ ff_add_format(&pix_fmts, fmt);
+ }
+
+ ff_set_common_formats(ctx, pix_fmts);
+ return 0;
+}
+
+static int config_input(AVFilterLink *inlink)
+{
+ TelecineContext *tc = inlink->dst->priv;
+ const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
+ int i, ret;
+
+ tc->temp = ff_get_video_buffer(inlink, inlink->w, inlink->h);
+ if (!tc->temp)
+ return AVERROR(ENOMEM);
+ for (i = 0; i < tc->out_cnt; i++) {
+ tc->frame[i] = ff_get_video_buffer(inlink, inlink->w, inlink->h);
+ if (!tc->frame[i])
+ return AVERROR(ENOMEM);
+ }
+
+ if ((ret = av_image_fill_linesizes(tc->stride, inlink->format, inlink->w)) < 0)
+ return ret;
+
+ tc->planeheight[1] = tc->planeheight[2] = FF_CEIL_RSHIFT(inlink->h, desc->log2_chroma_h);
+ tc->planeheight[0] = tc->planeheight[3] = inlink->h;
+
+ tc->nb_planes = av_pix_fmt_count_planes(inlink->format);
+
+ return 0;
+}
+
+static int config_output(AVFilterLink *outlink)
+{
+ AVFilterContext *ctx = outlink->src;
+ TelecineContext *tc = 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(tc->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->flags |= FF_LINK_FLAG_REQUEST_LOOP;
+ outlink->frame_rate = fps;
+ outlink->time_base = av_mul_q(inlink->time_base, tc->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);
+
+ tc->ts_unit = av_q2d(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 *tc = ctx->priv;
+ int i, len, ret = 0, nout = 0;
+
+ len = tc->pattern[tc->pattern_pos] - '0';
+
+ tc->pattern_pos++;
+ if (!tc->pattern[tc->pattern_pos])
+ tc->pattern_pos = 0;
+
+ if (!len) { // do not output any field from this frame
+ av_frame_free(&inpicref);
+ return 0;
+ }
+
+ if (tc->occupied) {
+ for (i = 0; i < tc->nb_planes; i++) {
+ // fill in the EARLIER field from the buffered pic
+ av_image_copy_plane(tc->frame[nout]->data[i] + tc->frame[nout]->linesize[i] * tc->first_field,
+ tc->frame[nout]->linesize[i] * 2,
+ tc->temp->data[i] + tc->temp->linesize[i] * tc->first_field,
+ tc->temp->linesize[i] * 2,
+ tc->stride[i],
+ (tc->planeheight[i] - tc->first_field + 1) / 2);
+ // fill in the LATER field from the new pic
+ av_image_copy_plane(tc->frame[nout]->data[i] + tc->frame[nout]->linesize[i] * !tc->first_field,
+ tc->frame[nout]->linesize[i] * 2,
+ inpicref->data[i] + inpicref->linesize[i] * !tc->first_field,
+ inpicref->linesize[i] * 2,
+ tc->stride[i],
+ (tc->planeheight[i] - !tc->first_field + 1) / 2);
+ }
+ nout++;
+ len--;
+ tc->occupied = 0;
+ }
+
+ while (len >= 2) {
+ // output THIS image as-is
+ for (i = 0; i < tc->nb_planes; i++)
+ av_image_copy_plane(tc->frame[nout]->data[i], tc->frame[nout]->linesize[i],
+ inpicref->data[i], inpicref->linesize[i],
+ tc->stride[i],
+ tc->planeheight[i]);
+ nout++;
+ len -= 2;
+ }
+
+ if (len >= 1) {
+ // copy THIS image to the buffer, we need it later
+ for (i = 0; i < tc->nb_planes; i++)
+ av_image_copy_plane(tc->temp->data[i], tc->temp->linesize[i],
+ inpicref->data[i], inpicref->linesize[i],
+ tc->stride[i],
+ tc->planeheight[i]);
+ tc->occupied = 1;
+ }
+
+ for (i = 0; i < nout; i++) {
+ AVFrame *frame = av_frame_clone(tc->frame[i]);
+
+ if (!frame) {
+ av_frame_free(&inpicref);
+ return AVERROR(ENOMEM);
+ }
+
+ av_frame_copy_props(frame, inpicref);
+ frame->pts = outlink->frame_count * tc->ts_unit;
+ ret = ff_filter_frame(outlink, frame);
+ }
+ av_frame_free(&inpicref);
+
+ return ret;
+}
+
+static av_cold void uninit(AVFilterContext *ctx)
+{
+ TelecineContext *tc = ctx->priv;
+ int i;
+
+ av_frame_free(&tc->temp);
+ for (i = 0; i < tc->out_cnt; i++)
+ av_frame_free(&tc->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 avfilter_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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