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-rw-r--r--libavfilter/vf_fieldhint.c283
1 files changed, 283 insertions, 0 deletions
diff --git a/libavfilter/vf_fieldhint.c b/libavfilter/vf_fieldhint.c
new file mode 100644
index 0000000000..2b845e7330
--- /dev/null
+++ b/libavfilter/vf_fieldhint.c
@@ -0,0 +1,283 @@
+/*
+ * Copyright (c) 2016 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
+ */
+
+#include "libavutil/avassert.h"
+#include "libavutil/imgutils.h"
+#include "libavutil/internal.h"
+#include "libavutil/opt.h"
+#include "libavutil/pixdesc.h"
+#include "avfilter.h"
+#include "internal.h"
+#include "video.h"
+
+typedef struct FieldHintContext {
+ const AVClass *class;
+
+ char *hint_file_str;
+ FILE *hint;
+ int mode;
+
+ AVFrame *frame[3];
+
+ int64_t line;
+ int nb_planes;
+ int eof;
+ int planewidth[4];
+ int planeheight[4];
+} FieldHintContext;
+
+#define OFFSET(x) offsetof(FieldHintContext, x)
+#define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
+
+static const AVOption fieldhint_options[] = {
+ { "hint", "set hint file", OFFSET(hint_file_str), AV_OPT_TYPE_STRING, {.str=NULL}, 0, 0, FLAGS },
+ { "mode", "set hint mode", OFFSET(mode), AV_OPT_TYPE_INT, {.i64=0}, 0, 1, FLAGS, "mode" },
+ { "absolute", 0, 0, AV_OPT_TYPE_CONST, {.i64=0}, 0, 0, FLAGS, "mode" },
+ { "relative", 0, 0, AV_OPT_TYPE_CONST, {.i64=1}, 0, 0, FLAGS, "mode" },
+ { NULL }
+};
+
+AVFILTER_DEFINE_CLASS(fieldhint);
+
+static av_cold int init(AVFilterContext *ctx)
+{
+ FieldHintContext *s = ctx->priv;
+ int ret;
+
+ if (!s->hint_file_str) {
+ av_log(ctx, AV_LOG_ERROR, "Hint file must be set.\n");
+ return AVERROR(EINVAL);
+ }
+ s->hint = fopen(s->hint_file_str, "r");
+ if (!s->hint) {
+ ret = AVERROR(errno);
+ av_log(ctx, AV_LOG_ERROR, "%s: %s\n", s->hint_file_str, av_err2str(ret));
+ return ret;
+ }
+
+ 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)
+{
+ FieldHintContext *s = inlink->dst->priv;
+ const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
+ int ret;
+
+ if ((ret = av_image_fill_linesizes(s->planewidth, 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 filter_frame(AVFilterLink *inlink, AVFrame *in)
+{
+ AVFilterContext *ctx = inlink->dst;
+ AVFilterLink *outlink = ctx->outputs[0];
+ FieldHintContext *s = ctx->priv;
+ AVFrame *out, *top, *bottom;
+ char buf[1024] = { 0 };
+ int64_t tf, bf;
+ char hint = '=';
+ int p;
+
+ av_frame_free(&s->frame[0]);
+ s->frame[0] = s->frame[1];
+ s->frame[1] = s->frame[2];
+ s->frame[2] = in;
+ if (!s->frame[1])
+ return 0;
+ else if (!s->frame[0]) {
+ s->frame[0] = av_frame_clone(s->frame[1]);
+ if (!s->frame[0])
+ return AVERROR(ENOMEM);
+ }
+
+ while (1) {
+ if (fgets(buf, sizeof(buf)-1, s->hint)) {
+ s->line++;
+ if (buf[0] == '#' || buf[0] == ';') {
+ continue;
+ } else if (sscanf(buf, "%"PRId64",%"PRId64" %c", &tf, &bf, &hint) == 3) {
+ ;
+ } else if (sscanf(buf, "%"PRId64",%"PRId64"", &tf, &bf) == 2) {
+ ;
+ } else {
+ av_log(ctx, AV_LOG_ERROR, "Invalid entry at line %"PRId64".\n", s->line);
+ return AVERROR_INVALIDDATA;
+ }
+ switch (s->mode) {
+ case 0:
+ if (tf > outlink->frame_count + 1 || tf < FFMAX(0, outlink->frame_count - 1) ||
+ bf > outlink->frame_count + 1 || bf < FFMAX(0, outlink->frame_count - 1)) {
+ av_log(ctx, AV_LOG_ERROR, "Out of range frames %"PRId64" and/or %"PRId64" on line %"PRId64" for %"PRId64". input frame.\n", tf, bf, s->line, inlink->frame_count);
+ return AVERROR_INVALIDDATA;
+ }
+ break;
+ case 1:
+ if (tf > 1 || tf < -1 ||
+ bf > 1 || bf < -1) {
+ av_log(ctx, AV_LOG_ERROR, "Out of range %"PRId64" and/or %"PRId64" on line %"PRId64" for %"PRId64". input frame.\n", tf, bf, s->line, inlink->frame_count);
+ return AVERROR_INVALIDDATA;
+ }
+ };
+ break;
+ } else {
+ av_log(ctx, AV_LOG_ERROR, "Missing entry for %"PRId64". input frame.\n", inlink->frame_count);
+ return AVERROR_INVALIDDATA;
+ }
+ }
+
+ out = ff_get_video_buffer(outlink, outlink->w, outlink->h);
+ if (!out)
+ return AVERROR(ENOMEM);
+ av_frame_copy_props(out, s->frame[1]);
+
+ switch (s->mode) {
+ case 0:
+ top = s->frame[tf - outlink->frame_count + 1];
+ bottom = s->frame[bf - outlink->frame_count + 1];
+ break;
+ case 1:
+ top = s->frame[1 + tf];
+ bottom = s->frame[1 + bf];
+ break;
+ default:
+ av_assert0(0);
+ }
+
+ switch (hint) {
+ case '+':
+ out->interlaced_frame = 1;
+ break;
+ case '-':
+ out->interlaced_frame = 0;
+ break;
+ case '=':
+ break;
+ default:
+ av_log(ctx, AV_LOG_ERROR, "Invalid hint: %c.\n", hint);
+ return AVERROR(EINVAL);
+ }
+
+ for (p = 0; p < s->nb_planes; p++) {
+ av_image_copy_plane(out->data[p],
+ out->linesize[p] * 2,
+ top->data[p],
+ top->linesize[p] * 2,
+ s->planewidth[p],
+ (s->planeheight[p] + 1) / 2);
+ av_image_copy_plane(out->data[p] + out->linesize[p],
+ out->linesize[p] * 2,
+ bottom->data[p] + bottom->linesize[p],
+ bottom->linesize[p] * 2,
+ s->planewidth[p],
+ (s->planeheight[p] + 1) / 2);
+ }
+
+ return ff_filter_frame(outlink, out);
+}
+
+static int request_frame(AVFilterLink *outlink)
+{
+ AVFilterContext *ctx = outlink->src;
+ FieldHintContext *s = ctx->priv;
+ int ret;
+
+ if (s->eof)
+ return AVERROR_EOF;
+
+ ret = ff_request_frame(ctx->inputs[0]);
+ if (ret == AVERROR_EOF && s->frame[2]) {
+ AVFrame *next = av_frame_clone(s->frame[2]);
+ if (!next)
+ return AVERROR(ENOMEM);
+ ret = filter_frame(ctx->inputs[0], next);
+ s->eof = 1;
+ }
+
+ return ret;
+}
+
+static av_cold void uninit(AVFilterContext *ctx)
+{
+ FieldHintContext *s = ctx->priv;
+
+ if (s->hint)
+ fclose(s->hint);
+ s->hint = NULL;
+
+ av_frame_free(&s->frame[0]);
+ av_frame_free(&s->frame[1]);
+ av_frame_free(&s->frame[2]);
+}
+
+static const AVFilterPad inputs[] = {
+ {
+ .name = "default",
+ .type = AVMEDIA_TYPE_VIDEO,
+ .config_props = config_input,
+ .filter_frame = filter_frame,
+ },
+ { NULL }
+};
+
+static const AVFilterPad outputs[] = {
+ {
+ .name = "default",
+ .type = AVMEDIA_TYPE_VIDEO,
+ .request_frame = request_frame,
+ },
+ { NULL }
+};
+
+AVFilter ff_vf_fieldhint = {
+ .name = "fieldhint",
+ .description = NULL_IF_CONFIG_SMALL("Field matching using hints."),
+ .priv_size = sizeof(FieldHintContext),
+ .priv_class = &fieldhint_class,
+ .init = init,
+ .uninit = uninit,
+ .query_formats = query_formats,
+ .inputs = inputs,
+ .outputs = outputs,
+};
generated by cgit v1.2.3 (git 2.39.1) at 2024-07-09 12:33:29 +0000