[PATCH 1/7] Implement settb filter.
Stefano Sabatini
stefano.sabatini-lala
Mon Jul 19 11:47:16 CEST 2010
---
doc/filters.texi | 22 ++++++++++
libavfilter/Makefile | 1 +
libavfilter/allfilters.c | 1 +
libavfilter/vf_settb.c | 105 ++++++++++++++++++++++++++++++++++++++++++++++
4 files changed, 129 insertions(+), 0 deletions(-)
create mode 100644 libavfilter/vf_settb.c
diff --git a/doc/filters.texi b/doc/filters.texi
index e4c1851..6f60cc3 100644
--- a/doc/filters.texi
+++ b/doc/filters.texi
@@ -428,6 +428,28 @@ ratio of the input image.
The default value of @var{width} and @var{height} is 0.
+ at section settb
+
+Set the timebase to use for the output frames timestamps.
+
+It accepts in input an arithmetic expression representing a rational.
+
+In the case the input is not specified the filter will use for the
+output the same timebase as used for the input.
+
+Follow some examples.
+
+ at example
+# set the timebase to 1/25
+settb=1/25
+
+# set the timebase to 1/10
+settb=0.1
+
+#set the timebase to 1001/1000
+settb=1+0.001
+ at end example
+
@section slicify
Pass the images of input video on to next video filter as multiple
diff --git a/libavfilter/Makefile b/libavfilter/Makefile
index 74e55bb..597e532 100644
--- a/libavfilter/Makefile
+++ b/libavfilter/Makefile
@@ -35,6 +35,7 @@ OBJS-$(CONFIG_PAD_FILTER) += vf_pad.o
OBJS-$(CONFIG_PIXDESCTEST_FILTER) += vf_pixdesctest.o
OBJS-$(CONFIG_PIXELASPECT_FILTER) += vf_aspect.o
OBJS-$(CONFIG_SCALE_FILTER) += vf_scale.o
+OBJS-$(CONFIG_SETTB_FILTER) += vf_settb.o
OBJS-$(CONFIG_SLICIFY_FILTER) += vf_slicify.o
OBJS-$(CONFIG_UNSHARP_FILTER) += vf_unsharp.o
OBJS-$(CONFIG_VFLIP_FILTER) += vf_vflip.o
diff --git a/libavfilter/allfilters.c b/libavfilter/allfilters.c
index c5da648..f5cc029 100644
--- a/libavfilter/allfilters.c
+++ b/libavfilter/allfilters.c
@@ -55,6 +55,7 @@ void avfilter_register_all(void)
REGISTER_FILTER (PIXDESCTEST, pixdesctest, vf);
REGISTER_FILTER (PIXELASPECT, pixelaspect, vf);
REGISTER_FILTER (SCALE, scale, vf);
+ REGISTER_FILTER (SETTB, settb, vf);
REGISTER_FILTER (SLICIFY, slicify, vf);
REGISTER_FILTER (UNSHARP, unsharp, vf);
REGISTER_FILTER (VFLIP, vflip, vf);
diff --git a/libavfilter/vf_settb.c b/libavfilter/vf_settb.c
new file mode 100644
index 0000000..ec9976d
--- /dev/null
+++ b/libavfilter/vf_settb.c
@@ -0,0 +1,105 @@
+/*
+ * Copyright (c) 2010 Stefano Sabatini
+ *
+ * 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
+ * Set timebase for the output link.
+ */
+
+#include "libavutil/eval.h"
+#include "libavutil/rational.h"
+#include "avfilter.h"
+#include "internal.h"
+
+typedef struct {
+ AVRational time_base;
+} SetTBContext;
+
+static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque)
+{
+ SetTBContext *settb = ctx->priv;
+ settb->time_base = (AVRational){0,0};
+
+ /* parse the input as a timebase if provided */
+ if (args) {
+ int ret;
+ double res;
+ if ((ret = av_parse_and_eval_expr(&res, args, NULL, NULL, NULL, NULL, NULL, NULL,
+ NULL, 0, NULL)) < 0) {
+ av_log(ctx, AV_LOG_ERROR, "Invalid expression '%s' for timebase.\n", args);
+ return ret;
+ }
+ settb->time_base = av_d2q(res, 1001000);
+ if (settb->time_base.num <= 0 || settb->time_base.den <= 0) {
+ av_log(ctx, AV_LOG_ERROR, "Invalid non-positive values for the timebase num:%d or den:%d.\n",
+ settb->time_base.num, settb->time_base.den);
+ return AVERROR(EINVAL);
+ }
+ }
+
+ return 0;
+}
+
+static int config_output_props(AVFilterLink *outlink)
+{
+ SetTBContext *settb = outlink->src->priv;
+ AVFilterLink *inlink = outlink->src->inputs[0];
+
+ outlink->w = inlink->w;
+ outlink->h = inlink->h;
+ if (settb->time_base.num != 0 || settb->time_base.den != 0) {
+ outlink->time_base = settb->time_base;
+ av_log(outlink->src, AV_LOG_INFO, "pts:%d/%d -> pts:%d/%d\n",
+ inlink ->time_base.num, inlink ->time_base.den,
+ outlink->time_base.num, outlink->time_base.den);
+ }
+
+ return 0;
+}
+
+static void start_frame(AVFilterLink *inlink, AVFilterBufferRef *picref)
+{
+ AVFilterLink *outlink = inlink->dst->outputs[0];
+ AVFilterBufferRef *picref2 = avfilter_ref_buffer(picref, ~0);
+
+ avfilter_unref_buffer(picref);
+ picref2->pts = av_rescale_q(picref->pts, inlink->time_base, outlink->time_base);
+ avfilter_start_frame(outlink, picref2);
+}
+
+AVFilter avfilter_vf_settb = {
+ .name = "settb",
+ .description = NULL_IF_CONFIG_SMALL("Set timebase for the output link."),
+ .init = init,
+
+ .priv_size = sizeof(SetTBContext),
+
+ .inputs = (AVFilterPad[]) {{ .name = "default",
+ .type = AVMEDIA_TYPE_VIDEO,
+ .get_video_buffer = avfilter_null_get_video_buffer,
+ .start_frame = start_frame,
+ .end_frame = avfilter_null_end_frame },
+ { .name = NULL }},
+
+ .outputs = (AVFilterPad[]) {{ .name = "default",
+ .type = AVMEDIA_TYPE_VIDEO,
+ .config_props = config_output_props, },
+ { .name = NULL}},
+};
--
1.7.1
--XsQoSWH+UP9D9v3l--
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