lavfi: remove some audio-related function from public API.

Those functions are only useful inside filters. It is better to not
support user filters until the API is more stable.

This breaks audio filtering API and ABI in theory, but since it's
unusable right now this shouldn't be a problem.

5 files changed, 86 insertions, 57 deletions

diff --git a/libavfilter/af_anull.c b/libavfilter/af_anull.c
index e2bed36f0a..59b275c767 100644
--- a/libavfilter/af_anull.c
+++ b/libavfilter/af_anull.c
@@ -21,6 +21,7 @@
  * null audio filter
  */
 
+#include "audio.h"
 #include "avfilter.h"
 
 AVFilter avfilter_af_anull = {
@@ -31,8 +32,8 @@ AVFilter avfilter_af_anull = {
 
     .inputs    = (AVFilterPad[]) {{ .name             = "default",
                                     .type             = AVMEDIA_TYPE_AUDIO,
-                                    .get_audio_buffer = avfilter_null_get_audio_buffer,
-                                    .filter_samples   = avfilter_null_filter_samples },
+                                    .get_audio_buffer = ff_null_get_audio_buffer,
+                                    .filter_samples   = ff_null_filter_samples },
                                   { .name = NULL}},
 
     .outputs   = (AVFilterPad[]) {{ .name             = "default",
diff --git a/libavfilter/audio.h b/libavfilter/audio.h
new file mode 100644
index 0000000000..935bec5c43
--- /dev/null
+++ b/libavfilter/audio.h
@@ -0,0 +1,61 @@
+/*
+ * This file is part of Libav.
+ *
+ * Libav 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.
+ *
+ * Libav 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 Libav; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#ifndef AVFILTER_AUDIO_H
+#define AVFILTER_AUDIO_H
+
+#include "avfilter.h"
+
+/** default handler for get_audio_buffer() for audio inputs */
+AVFilterBufferRef *ff_default_get_audio_buffer(AVFilterLink *link, int perms,
+                                                     int nb_samples);
+
+/** get_audio_buffer() handler for filters which simply pass audio along */
+AVFilterBufferRef *ff_null_get_audio_buffer(AVFilterLink *link, int perms,
+                                                  int nb_samples);
+
+/**
+ * Request an audio samples buffer with a specific set of permissions.
+ *
+ * @param link           the output link to the filter from which the buffer will
+ *                       be requested
+ * @param perms          the required access permissions
+ * @param nb_samples     the number of samples per channel
+ * @return               A reference to the samples. This must be unreferenced with
+ *                       avfilter_unref_buffer when you are finished with it.
+ */
+AVFilterBufferRef *ff_get_audio_buffer(AVFilterLink *link, int perms,
+                                             int nb_samples);
+
+/** default handler for filter_samples() for audio inputs */
+void ff_default_filter_samples(AVFilterLink *link, AVFilterBufferRef *samplesref);
+
+/** filter_samples() handler for filters which simply pass audio along */
+void ff_null_filter_samples(AVFilterLink *link, AVFilterBufferRef *samplesref);
+
+/**
+ * Send a buffer of audio samples to the next filter.
+ *
+ * @param link       the output link over which the audio samples are being sent
+ * @param samplesref a reference to the buffer of audio samples being sent. The
+ *                   receiving filter will free this reference when it no longer
+ *                   needs it or pass it on to the next filter.
+ */
+void ff_filter_samples(AVFilterLink *link, AVFilterBufferRef *samplesref);
+
+#endif /* AVFILTER_AUDIO_H */
diff --git a/libavfilter/avfilter.c b/libavfilter/avfilter.c
index e301ddb37b..6a530f8fd6 100644
--- a/libavfilter/avfilter.c
+++ b/libavfilter/avfilter.c
@@ -26,6 +26,8 @@
 #include "libavutil/audioconvert.h"
 #include "libavutil/imgutils.h"
 #include "libavcodec/avcodec.h"
+
+#include "audio.h"
 #include "avfilter.h"
 #include "internal.h"
 
@@ -366,8 +368,8 @@ fail:
     return NULL;
 }
 
-AVFilterBufferRef *avfilter_get_audio_buffer(AVFilterLink *link, int perms,
-                                             int nb_samples)
+AVFilterBufferRef *ff_get_audio_buffer(AVFilterLink *link, int perms,
+                                       int nb_samples)
 {
     AVFilterBufferRef *ret = NULL;
 
@@ -375,7 +377,7 @@ AVFilterBufferRef *avfilter_get_audio_buffer(AVFilterLink *link, int perms,
         ret = link->dstpad->get_audio_buffer(link, perms, nb_samples);
 
     if (!ret)
-        ret = avfilter_default_get_audio_buffer(link, perms, nb_samples);
+        ret = ff_default_get_audio_buffer(link, perms, nb_samples);
 
     if (ret)
         ret->type = AVMEDIA_TYPE_AUDIO;
@@ -570,7 +572,7 @@ void avfilter_draw_slice(AVFilterLink *link, int y, int h, int slice_dir)
     draw_slice(link, y, h, slice_dir);
 }
 
-void avfilter_filter_samples(AVFilterLink *link, AVFilterBufferRef *samplesref)
+void ff_filter_samples(AVFilterLink *link, AVFilterBufferRef *samplesref)
 {
     void (*filter_samples)(AVFilterLink *, AVFilterBufferRef *);
     AVFilterPad *dst = link->dstpad;
@@ -578,7 +580,7 @@ void avfilter_filter_samples(AVFilterLink *link, AVFilterBufferRef *samplesref)
     FF_DPRINTF_START(NULL, filter_samples); ff_dlog_link(NULL, link, 1);
 
     if (!(filter_samples = dst->filter_samples))
-        filter_samples = avfilter_default_filter_samples;
+        filter_samples = ff_default_filter_samples;
 
     /* prepare to copy the samples if the buffer has insufficient permissions */
     if ((dst->min_perms & samplesref->perms) != dst->min_perms ||
@@ -591,8 +593,8 @@ void avfilter_filter_samples(AVFilterLink *link, AVFilterBufferRef *samplesref)
                "Copying audio data in avfilter (have perms %x, need %x, reject %x)\n",
                samplesref->perms, link->dstpad->min_perms, link->dstpad->rej_perms);
 
-        link->cur_buf = avfilter_default_get_audio_buffer(link, dst->min_perms,
-                                                          samplesref->audio->nb_samples);
+        link->cur_buf = ff_default_get_audio_buffer(link, dst->min_perms,
+                                                    samplesref->audio->nb_samples);
         link->cur_buf->pts                = samplesref->pts;
         link->cur_buf->audio->sample_rate = samplesref->audio->sample_rate;
 
diff --git a/libavfilter/avfilter.h b/libavfilter/avfilter.h
index 69ada1b8be..fd996db94b 100644
--- a/libavfilter/avfilter.h
+++ b/libavfilter/avfilter.h
@@ -460,9 +460,6 @@ void avfilter_default_draw_slice(AVFilterLink *link, int y, int h, int slice_dir
 /** default handler for end_frame() for video inputs */
 void avfilter_default_end_frame(AVFilterLink *link);
 
-/** default handler for filter_samples() for audio inputs */
-void avfilter_default_filter_samples(AVFilterLink *link, AVFilterBufferRef *samplesref);
-
 /** default handler for config_props() for audio/video outputs */
 int avfilter_default_config_output_link(AVFilterLink *link);
 
@@ -470,10 +467,6 @@ int avfilter_default_config_output_link(AVFilterLink *link);
 AVFilterBufferRef *avfilter_default_get_video_buffer(AVFilterLink *link,
                                                      int perms, int w, int h);
 
-/** default handler for get_audio_buffer() for audio inputs */
-AVFilterBufferRef *avfilter_default_get_audio_buffer(AVFilterLink *link, int perms,
-                                                     int nb_samples);
-
 /**
  * A helper for query_formats() which sets all links to the same list of
  * formats. If there are no links hooked to this filter, the list of formats is
@@ -493,17 +486,10 @@ void avfilter_null_draw_slice(AVFilterLink *link, int y, int h, int slice_dir);
 /** end_frame() handler for filters which simply pass video along */
 void avfilter_null_end_frame(AVFilterLink *link);
 
-/** filter_samples() handler for filters which simply pass audio along */
-void avfilter_null_filter_samples(AVFilterLink *link, AVFilterBufferRef *samplesref);
-
 /** get_video_buffer() handler for filters which simply pass video along */
 AVFilterBufferRef *avfilter_null_get_video_buffer(AVFilterLink *link,
                                                   int perms, int w, int h);
 
-/** get_audio_buffer() handler for filters which simply pass audio along */
-AVFilterBufferRef *avfilter_null_get_audio_buffer(AVFilterLink *link, int perms,
-                                                  int nb_samples);
-
 /**
  * Filter definition. This defines the pads a filter contains, and all the
  * callback functions used to interact with the filter.
@@ -684,19 +670,6 @@ avfilter_get_video_buffer_ref_from_arrays(uint8_t *data[4], int linesize[4], int
                                           int w, int h, enum PixelFormat format);
 
 /**
- * Request an audio samples buffer with a specific set of permissions.
- *
- * @param link           the output link to the filter from which the buffer will
- *                       be requested
- * @param perms          the required access permissions
- * @param nb_samples     the number of samples per channel
- * @return               A reference to the samples. This must be unreferenced with
- *                       avfilter_unref_buffer when you are finished with it.
- */
-AVFilterBufferRef *avfilter_get_audio_buffer(AVFilterLink *link, int perms,
-                                             int nb_samples);
-
-/**
  * Create an audio buffer reference wrapped around an already
  * allocated samples buffer.
  *
@@ -766,16 +739,6 @@ void avfilter_end_frame(AVFilterLink *link);
  */
 void avfilter_draw_slice(AVFilterLink *link, int y, int h, int slice_dir);
 
-/**
- * Send a buffer of audio samples to the next filter.
- *
- * @param link       the output link over which the audio samples are being sent
- * @param samplesref a reference to the buffer of audio samples being sent. The
- *                   receiving filter will free this reference when it no longer
- *                   needs it or pass it on to the next filter.
- */
-void avfilter_filter_samples(AVFilterLink *link, AVFilterBufferRef *samplesref);
-
 /** Initialize the filter system. Register all builtin filters. */
 void avfilter_register_all(void);
 
diff --git a/libavfilter/defaults.c b/libavfilter/defaults.c
index df05c06d63..c25d37f8b3 100644
--- a/libavfilter/defaults.c
+++ b/libavfilter/defaults.c
@@ -22,6 +22,8 @@
 #include "libavutil/audioconvert.h"
 #include "libavutil/imgutils.h"
 #include "libavutil/samplefmt.h"
+
+#include "audio.h"
 #include "avfilter.h"
 #include "internal.h"
 
@@ -57,8 +59,8 @@ AVFilterBufferRef *avfilter_default_get_video_buffer(AVFilterLink *link, int per
     return picref;
 }
 
-AVFilterBufferRef *avfilter_default_get_audio_buffer(AVFilterLink *link, int perms,
-                                                     int nb_samples)
+AVFilterBufferRef *ff_default_get_audio_buffer(AVFilterLink *link, int perms,
+                                               int nb_samples)
 {
     AVFilterBufferRef *samplesref = NULL;
     uint8_t **data;
@@ -133,7 +135,7 @@ void avfilter_default_end_frame(AVFilterLink *inlink)
 }
 
 /* FIXME: samplesref is same as link->cur_buf. Need to consider removing the redundant parameter. */
-void avfilter_default_filter_samples(AVFilterLink *inlink, AVFilterBufferRef *samplesref)
+void ff_default_filter_samples(AVFilterLink *inlink, AVFilterBufferRef *samplesref)
 {
     AVFilterLink *outlink = NULL;
 
@@ -141,11 +143,11 @@ void avfilter_default_filter_samples(AVFilterLink *inlink, AVFilterBufferRef *sa
         outlink = inlink->dst->outputs[0];
 
     if (outlink) {
-        outlink->out_buf = avfilter_default_get_audio_buffer(inlink, AV_PERM_WRITE,
-                                                             samplesref->audio->nb_samples);
+        outlink->out_buf = ff_default_get_audio_buffer(inlink, AV_PERM_WRITE,
+                                                       samplesref->audio->nb_samples);
         outlink->out_buf->pts                = samplesref->pts;
         outlink->out_buf->audio->sample_rate = samplesref->audio->sample_rate;
-        avfilter_filter_samples(outlink, avfilter_ref_buffer(outlink->out_buf, ~0));
+        ff_filter_samples(outlink, avfilter_ref_buffer(outlink->out_buf, ~0));
         avfilter_unref_buffer(outlink->out_buf);
         outlink->out_buf = NULL;
     }
@@ -233,9 +235,9 @@ void avfilter_null_end_frame(AVFilterLink *link)
     avfilter_end_frame(link->dst->outputs[0]);
 }
 
-void avfilter_null_filter_samples(AVFilterLink *link, AVFilterBufferRef *samplesref)
+void ff_null_filter_samples(AVFilterLink *link, AVFilterBufferRef *samplesref)
 {
-    avfilter_filter_samples(link->dst->outputs[0], samplesref);
+    ff_filter_samples(link->dst->outputs[0], samplesref);
 }
 
 AVFilterBufferRef *avfilter_null_get_video_buffer(AVFilterLink *link, int perms, int w, int h)
@@ -243,8 +245,8 @@ AVFilterBufferRef *avfilter_null_get_video_buffer(AVFilterLink *link, int perms,
     return avfilter_get_video_buffer(link->dst->outputs[0], perms, w, h);
 }
 
-AVFilterBufferRef *avfilter_null_get_audio_buffer(AVFilterLink *link, int perms,
-                                                  int nb_samples)
+AVFilterBufferRef *ff_null_get_audio_buffer(AVFilterLink *link, int perms,
+                                            int nb_samples)
 {
-    return avfilter_get_audio_buffer(link->dst->outputs[0], perms, nb_samples);
+    return ff_get_audio_buffer(link->dst->outputs[0], perms, nb_samples);
 }