@@ -19,6 +19,7 @@ version <next>:

 - add libavresample audio conversion library

 - audio filters support in libavfilter and avconv

 - add fps filter

+- audio split filter

 version 0.8:

@@ -137,6 +137,19 @@ aformat=sample_fmts\=u8\,s16:channel_layouts\=stereo

 Pass the audio source unchanged to the output.

+@section asplit

+

+Split input audio into several identical outputs.

+

+The filter accepts a single parameter which specifies the number of outputs. If

+unspecified, it defaults to 2.

+

+For example

+@example

+avconv -i INPUT -filter_complex asplit=5 OUTPUT

+@end example

+will create 5 copies of the input audio.

+

 @section asyncts

 Synchronize audio data with timestamps by squeezing/stretching it and/or

 dropping samples/adding silence when needed.

@@ -27,6 +27,7 @@ OBJS = allfilters.o                                                     \

 OBJS-$(CONFIG_AFORMAT_FILTER)                += af_aformat.o

 OBJS-$(CONFIG_ANULL_FILTER)                  += af_anull.o

+OBJS-$(CONFIG_ASPLIT_FILTER)                 += split.o

 OBJS-$(CONFIG_ASYNCTS_FILTER)                += af_asyncts.o

 OBJS-$(CONFIG_RESAMPLE_FILTER)               += af_resample.o

@@ -36,6 +36,7 @@ void avfilter_register_all(void)

     REGISTER_FILTER (AFORMAT,     aformat,     af);

     REGISTER_FILTER (ANULL,       anull,       af);

+    REGISTER_FILTER (ASPLIT,      asplit,      af);

     REGISTER_FILTER (ASYNCTS,     asyncts,     af);

     REGISTER_FILTER (RESAMPLE,    resample,    af);

@@ -20,10 +20,11 @@

 /**

  * @file

- * Video splitter

+ * audio and video splitter

  */

 #include "avfilter.h"

+#include "audio.h"

 static int split_init(AVFilterContext *ctx, const char *args, void *opaque)

 {

@@ -43,7 +44,7 @@ static int split_init(AVFilterContext *ctx, const char *args, void *opaque)

         AVFilterPad pad = { 0 };

         snprintf(name, sizeof(name), "output%d", i);

-        pad.type = AVMEDIA_TYPE_VIDEO;

+        pad.type = ctx->filter->inputs[0].type;

         pad.name = av_strdup(name);

         avfilter_insert_outpad(ctx, i, &pad);

@@ -106,3 +107,28 @@ AVFilter avfilter_vf_split = {

                                   { .name = NULL}},

     .outputs   = (AVFilterPad[]) {{ .name = NULL}},

 };

+

+static void filter_samples(AVFilterLink *inlink, AVFilterBufferRef *samplesref)

+{

+    AVFilterContext *ctx = inlink->dst;

+    int i;

+

+    for (i = 0; i < ctx->output_count; i++)

+        ff_filter_samples(inlink->dst->outputs[i],

+                          avfilter_ref_buffer(samplesref, ~AV_PERM_WRITE));

+}

+

+AVFilter avfilter_af_asplit = {

+    .name        = "asplit",

+    .description = NULL_IF_CONFIG_SMALL("Pass on the audio input to N audio outputs."),

+

+    .init   = split_init,

+    .uninit = split_uninit,

+

+    .inputs  = (const AVFilterPad[]) {{ .name             = "default",

+                                        .type             = AVMEDIA_TYPE_AUDIO,

+                                        .get_audio_buffer = ff_null_get_audio_buffer,

+                                        .filter_samples   = filter_samples },

+                                      { .name = NULL }},

+    .outputs = (const AVFilterPad[]) {{ .name = NULL }},

+};

@@ -29,7 +29,7 @@

 #include "libavutil/avutil.h"

 #define LIBAVFILTER_VERSION_MAJOR  2

-#define LIBAVFILTER_VERSION_MINOR  18

+#define LIBAVFILTER_VERSION_MINOR  19

 #define LIBAVFILTER_VERSION_MICRO  0

 #define LIBAVFILTER_VERSION_INT AV_VERSION_INT(LIBAVFILTER_VERSION_MAJOR, \