@@ -31,6 +31,7 @@ version <next>:

 - ADPCM AICA decoder

 - Interplay ACM demuxer and audio decoder

 - XMA1 & XMA2 decoder

+- realtime filter

 version 2.8:

@@ -13068,6 +13068,22 @@ following one, the permission might not be received as expected in that

 following filter. Inserting a @ref{format} or @ref{aformat} filter before the

 perms/aperms filter can avoid this problem.

+@section realtime, arealtime

+

+Slow down filtering to match real time approximatively.

+

+These filters will pause the filtering for a variable amount of time to

+match the output rate with the input timestamps.

+They are similar to the @option{re} option to @code{ffmpeg}.

+

+They accept the following options:

+

+@table @option

+@item limit

+Time limit for the pauses. Any pause longer than that will be considered

+a timestamp discontinuity and reset the timer. Default is 2 seconds.

+@end table

+

 @section select, aselect

 Select frames to pass in output.

@@ -39,6 +39,7 @@ OBJS-$(CONFIG_ANULL_FILTER)                  += af_anull.o

 OBJS-$(CONFIG_APAD_FILTER)                   += af_apad.o

 OBJS-$(CONFIG_APERMS_FILTER)                 += f_perms.o

 OBJS-$(CONFIG_APHASER_FILTER)                += af_aphaser.o generate_wave_table.o

+OBJS-$(CONFIG_AREALTIME_FILTER)              += f_realtime.o

 OBJS-$(CONFIG_ARESAMPLE_FILTER)              += af_aresample.o

 OBJS-$(CONFIG_AREVERSE_FILTER)               += f_reverse.o

 OBJS-$(CONFIG_ASELECT_FILTER)                += f_select.o

@@ -197,6 +198,7 @@ OBJS-$(CONFIG_PSNR_FILTER)                   += vf_psnr.o dualinput.o framesync.

 OBJS-$(CONFIG_PULLUP_FILTER)                 += vf_pullup.o

 OBJS-$(CONFIG_QP_FILTER)                     += vf_qp.o

 OBJS-$(CONFIG_RANDOM_FILTER)                 += vf_random.o

+OBJS-$(CONFIG_REALTIME_FILTER)               += f_realtime.o

 OBJS-$(CONFIG_REMOVEGRAIN_FILTER)            += vf_removegrain.o

 OBJS-$(CONFIG_REMOVELOGO_FILTER)             += bbox.o lswsutils.o lavfutils.o vf_removelogo.o

 OBJS-$(CONFIG_REPEATFIELDS_FILTER)           += vf_repeatfields.o

@@ -61,6 +61,7 @@ void avfilter_register_all(void)

     REGISTER_FILTER(APAD,           apad,           af);

     REGISTER_FILTER(APERMS,         aperms,         af);

     REGISTER_FILTER(APHASER,        aphaser,        af);

+    REGISTER_FILTER(AREALTIME,      arealtime,      af);

     REGISTER_FILTER(ARESAMPLE,      aresample,      af);

     REGISTER_FILTER(AREVERSE,       areverse,       af);

     REGISTER_FILTER(ASELECT,        aselect,        af);

@@ -218,6 +219,7 @@ void avfilter_register_all(void)

     REGISTER_FILTER(PULLUP,         pullup,         vf);

     REGISTER_FILTER(QP,             qp,             vf);

     REGISTER_FILTER(RANDOM,         random,         vf);

+    REGISTER_FILTER(REALTIME,       realtime,       vf);

     REGISTER_FILTER(REMOVEGRAIN,    removegrain,    vf);

     REGISTER_FILTER(REMOVELOGO,     removelogo,     vf);

     REGISTER_FILTER(REPEATFIELDS,   repeatfields,   vf);

new file mode 100644

@@ -0,0 +1,132 @@

+/*

+ * Copyright (c) 2015 Nicolas George

+ *

+ * 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/opt.h"

+#include "libavutil/time.h"

+#include "avfilter.h"

+#include "internal.h"

+

+typedef struct RealtimeContext {

+    const AVClass *class;

+    int64_t delta;

+    int64_t limit;

+    unsigned inited;

+} RealtimeContext;

+

+static int filter_frame(AVFilterLink *inlink, AVFrame *frame)

+{

+    AVFilterContext *ctx = inlink->dst;

+    RealtimeContext *s = ctx->priv;

+

+    if (frame->pts != AV_NOPTS_VALUE) {

+        int64_t pts = av_rescale_q(frame->pts, inlink->time_base, AV_TIME_BASE_Q);

+        int64_t now = av_gettime_relative();

+        int64_t sleep = pts - now + s->delta;

+        if (!s->inited) {

+            s->inited = 1;

+            sleep = 0;

+            s->delta = now - pts;

+        }

+        if (sleep > s->limit || sleep < -s->limit) {

+            av_log(ctx, AV_LOG_WARNING,

+                   "time discontinuity detected: %"PRIi64" us, resetting\n",

+                   sleep);

+            sleep = 0;

+            s->delta = now - pts;

+        }

+        if (sleep > 0) {

+            av_log(ctx, AV_LOG_DEBUG, "sleeping %"PRIi64" us\n", sleep);

+            for (; sleep > 600000000; sleep -= 600000000)

+                av_usleep(600000000);

+            av_usleep(sleep);

+        }

+    }

+    return ff_filter_frame(inlink->dst->outputs[0], frame);

+}

+

+#define OFFSET(x) offsetof(RealtimeContext, x)

+#define FLAGS AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_AUDIO_PARAM | AV_OPT_FLAG_FILTERING_PARAM

+static const AVOption options[] = {

+    { "limit", "sleep time limit", OFFSET(limit), AV_OPT_TYPE_DURATION, { .i64 = 2000000 }, 0, INT64_MAX, FLAGS },

+    { NULL }

+};

+

+#if CONFIG_REALTIME_FILTER

+#define realtime_options options

+AVFILTER_DEFINE_CLASS(realtime);

+

+static const AVFilterPad avfilter_vf_realtime_inputs[] = {

+    {

+        .name         = "default",

+        .type         = AVMEDIA_TYPE_VIDEO,

+        .filter_frame = filter_frame,

+    },

+    { NULL }

+};

+

+static const AVFilterPad avfilter_vf_realtime_outputs[] = {

+    {

+        .name = "default",

+        .type = AVMEDIA_TYPE_VIDEO,

+    },

+    { NULL }

+};

+

+AVFilter ff_vf_realtime = {

+    .name        = "realtime",

+    .description = NULL_IF_CONFIG_SMALL("Slow down filtering to match realtime"),

+    .priv_size   = sizeof(RealtimeContext),

+    .priv_class  = &realtime_class,

+    .inputs      = avfilter_vf_realtime_inputs,

+    .outputs     = avfilter_vf_realtime_outputs,

+};

+#endif /* CONFIG_REALTIME_FILTER */

+

+#if CONFIG_AREALTIME_FILTER

+

+#define arealtime_options options

+AVFILTER_DEFINE_CLASS(arealtime);

+

+static const AVFilterPad arealtime_inputs[] = {

+    {

+        .name         = "default",

+        .type         = AVMEDIA_TYPE_AUDIO,

+        .filter_frame = filter_frame,

+    },

+    { NULL }

+};

+

+static const AVFilterPad arealtime_outputs[] = {

+    {

+        .name = "default",

+        .type = AVMEDIA_TYPE_AUDIO,

+    },

+    { NULL }

+};

+

+AVFilter ff_af_arealtime = {

+    .name        = "arealtime",

+    .description = NULL_IF_CONFIG_SMALL("Slow down filtering to match realtime"),

+    .priv_size   = sizeof(RealtimeContext),

+    .priv_class  = &arealtime_class,

+    .inputs      = arealtime_inputs,

+    .outputs     = arealtime_outputs,

+};

+#endif /* CONFIG_AREALTIME_FILTER */