Hi,
patch attached.
From 1fd9636e9040b2a6b321cdd16ebd392c8db2de1b Mon Sep 17 00:00:00 2001
From: Paul B Mahol <one...@gmail.com>
Date: Thu, 11 Feb 2016 22:05:54 +0100
Subject: [PATCH] avfilter: add loop filters
Signed-off-by: Paul B Mahol <one...@gmail.com>
---
libavfilter/Makefile | 2 +
libavfilter/allfilters.c | 2 +
libavfilter/f_loop.c | 220 +++++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 224 insertions(+)
create mode 100644 libavfilter/f_loop.c
diff --git a/libavfilter/Makefile b/libavfilter/Makefile
index 8916588..35ac53a 100644
--- a/libavfilter/Makefile
+++ b/libavfilter/Makefile
@@ -38,6 +38,7 @@ OBJS-$(CONFIG_AGATE_FILTER) += af_agate.o
OBJS-$(CONFIG_AINTERLEAVE_FILTER) += f_interleave.o
OBJS-$(CONFIG_ALIMITER_FILTER) += af_alimiter.o
OBJS-$(CONFIG_ALLPASS_FILTER) += af_biquads.o
+OBJS-$(CONFIG_ALOOP_FILTER) += f_loop.o
OBJS-$(CONFIG_AMERGE_FILTER) += af_amerge.o
OBJS-$(CONFIG_AMETADATA_FILTER) += f_metadata.o
OBJS-$(CONFIG_AMIX_FILTER) += af_amix.o
@@ -180,6 +181,7 @@ OBJS-$(CONFIG_INTERLACE_FILTER) += vf_interlace.o
OBJS-$(CONFIG_INTERLEAVE_FILTER) += f_interleave.o
OBJS-$(CONFIG_KERNDEINT_FILTER) += vf_kerndeint.o
OBJS-$(CONFIG_LENSCORRECTION_FILTER) += vf_lenscorrection.o
+OBJS-$(CONFIG_LOOP_FILTER) += f_loop.o
OBJS-$(CONFIG_LUT3D_FILTER) += vf_lut3d.o
OBJS-$(CONFIG_LUT_FILTER) += vf_lut.o
OBJS-$(CONFIG_LUTRGB_FILTER) += vf_lut.o
diff --git a/libavfilter/allfilters.c b/libavfilter/allfilters.c
index fa7d304..6331fe5 100644
--- a/libavfilter/allfilters.c
+++ b/libavfilter/allfilters.c
@@ -58,6 +58,7 @@ void avfilter_register_all(void)
REGISTER_FILTER(AINTERLEAVE, ainterleave, af);
REGISTER_FILTER(ALIMITER, alimiter, af);
REGISTER_FILTER(ALLPASS, allpass, af);
+ REGISTER_FILTER(ALOOP, aloop, af);
REGISTER_FILTER(AMERGE, amerge, af);
REGISTER_FILTER(AMETADATA, ametadata, af);
REGISTER_FILTER(AMIX, amix, af);
@@ -201,6 +202,7 @@ void avfilter_register_all(void)
REGISTER_FILTER(INTERLEAVE, interleave, vf);
REGISTER_FILTER(KERNDEINT, kerndeint, vf);
REGISTER_FILTER(LENSCORRECTION, lenscorrection, vf);
+ REGISTER_FILTER(LOOP, loop, vf);
REGISTER_FILTER(LUT3D, lut3d, vf);
REGISTER_FILTER(LUT, lut, vf);
REGISTER_FILTER(LUTRGB, lutrgb, vf);
diff --git a/libavfilter/f_loop.c b/libavfilter/f_loop.c
new file mode 100644
index 0000000..beef4fc
--- /dev/null
+++ b/libavfilter/f_loop.c
@@ -0,0 +1,220 @@
+/*
+ * 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/fifo.h"
+#include "libavutil/internal.h"
+#include "libavutil/opt.h"
+#include "avfilter.h"
+#include "audio.h"
+#include "formats.h"
+#include "internal.h"
+#include "video.h"
+
+typedef struct LoopContext {
+ const AVClass *class;
+
+ AVFrame **frames;
+ int nb_frames;
+ int current_frame;
+ int64_t start_pts;
+ int64_t duration;
+
+ int loop;
+ int size;
+ int64_t start;
+} LoopContext;
+
+#define OFFSET(x) offsetof(LoopContext, x)
+#define DEFINE_OPTIONS(filt_name, FLAGS) \
+static const AVOption filt_name##_options[] = { \
+ { "loop", "number of loops", OFFSET(loop), AV_OPT_TYPE_INT, {.i64 = 0 }, -1, INT_MAX, FLAGS }, \
+ { "size", "max number of frames to loop", OFFSET(size), AV_OPT_TYPE_INT, {.i64 = 0 }, 0, INT16_MAX, FLAGS }, \
+ { "start", "set the loop start frame", OFFSET(start), AV_OPT_TYPE_INT64, {.i64 = 0 }, 0, INT64_MAX, FLAGS }, \
+ { NULL } \
+}
+
+static av_cold int init(AVFilterContext *ctx)
+{
+ LoopContext *s = ctx->priv;
+
+ s->frames = av_calloc(s->size, sizeof(*s->frames));
+ if (!s->frames)
+ return AVERROR(ENOMEM);
+
+ return 0;
+}
+
+static av_cold void uninit(AVFilterContext *ctx)
+{
+ LoopContext *s = ctx->priv;
+ int i;
+
+ for (i = 0; i < s->nb_frames; i++)
+ av_frame_free(&s->frames[i]);
+
+ av_freep(&s->frames);
+ s->nb_frames = 0;
+}
+
+static int push_frame(AVFilterContext *ctx)
+{
+ AVFilterLink *outlink = ctx->outputs[0];
+ LoopContext *s = ctx->priv;
+ int64_t pts;
+ int ret;
+
+ AVFrame *out = av_frame_clone(s->frames[s->current_frame]);
+
+ if (!out)
+ return AVERROR(ENOMEM);
+ out->pts += s->duration - s->start_pts;
+ pts = out->pts + out->pkt_duration;
+ ret = ff_filter_frame(outlink, out);
+ s->current_frame++;
+
+ if (s->current_frame >= s->nb_frames) {
+ s->duration = pts;
+ s->current_frame = 0;
+
+ if (s->loop > 0)
+ s->loop--;
+ }
+
+ return ret;
+}
+
+static int filter_frame(AVFilterLink *inlink, AVFrame *frame)
+{
+ AVFilterContext *ctx = inlink->dst;
+ AVFilterLink *outlink = ctx->outputs[0];
+ LoopContext *s = ctx->priv;
+ int ret = 0;
+
+ if (inlink->frame_count >= s->start && s->size > 0 && s->loop != 0) {
+ if (s->nb_frames < s->size) {
+ if (!s->nb_frames)
+ s->start_pts = frame->pts;
+ s->frames[s->nb_frames] = av_frame_clone(frame);
+ if (!s->frames[s->nb_frames]) {
+ av_frame_free(&frame);
+ return AVERROR(ENOMEM);
+ }
+ s->nb_frames++;
+ s->duration = frame->pts + frame->pkt_duration;
+ ret = ff_filter_frame(outlink, frame);
+ } else {
+ av_frame_free(&frame);
+ ret = push_frame(ctx);
+ }
+ } else {
+ ret = ff_filter_frame(outlink, frame);
+ }
+
+ return ret;
+}
+
+static int request_frame(AVFilterLink *outlink)
+{
+ AVFilterContext *ctx = outlink->src;
+ LoopContext *s = ctx->priv;
+ int ret;
+
+ ret = ff_request_frame(ctx->inputs[0]);
+
+ if (ret == AVERROR_EOF && s->nb_frames > 0 && s->loop != 0) {
+ ret = push_frame(ctx);
+ }
+
+ return ret;
+}
+
+#if CONFIG_ALOOP_FILTER
+
+DEFINE_OPTIONS(aloop, AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM);
+AVFILTER_DEFINE_CLASS(aloop);
+
+static const AVFilterPad ainputs[] = {
+ {
+ .name = "default",
+ .type = AVMEDIA_TYPE_AUDIO,
+ .filter_frame = filter_frame,
+ },
+ { NULL }
+};
+
+static const AVFilterPad aoutputs[] = {
+ {
+ .name = "default",
+ .type = AVMEDIA_TYPE_AUDIO,
+ .request_frame = request_frame,
+ },
+ { NULL }
+};
+
+AVFilter ff_af_aloop = {
+ .name = "aloop",
+ .description = NULL_IF_CONFIG_SMALL("Loop audio frames."),
+ .priv_size = sizeof(LoopContext),
+ .priv_class = &aloop_class,
+ .init = init,
+ .uninit = uninit,
+ .query_formats = ff_query_formats_all,
+ .inputs = ainputs,
+ .outputs = aoutputs,
+ .flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC,
+};
+#endif /* CONFIG_ALOOP_FILTER */
+
+#if CONFIG_LOOP_FILTER
+
+DEFINE_OPTIONS(loop, AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM);
+AVFILTER_DEFINE_CLASS(loop);
+
+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,
+ .request_frame = request_frame,
+ },
+ { NULL }
+};
+
+AVFilter ff_vf_loop = {
+ .name = "loop",
+ .description = NULL_IF_CONFIG_SMALL("Loop video frames."),
+ .priv_size = sizeof(LoopContext),
+ .priv_class = &loop_class,
+ .init = init,
+ .uninit = uninit,
+ .inputs = inputs,
+ .outputs = outputs,
+ .flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC,
+};
+#endif /* CONFIG_LOOP_FILTER */
--
1.9.1
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