From f8e93e8037402c154827696bf04cbd41f3f21a48 Mon Sep 17 00:00:00 2001
From: anders <anders@b3059339-0415-0410-9bf9-f77b7e298cf2>
Date: Mon, 7 Oct 2002 10:46:01 +0000
Subject: [PATCH] Adding functionality for adding filters during execution

git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@7650 b3059339-0415-0410-9bf9-f77b7e298cf2
---
 libaf/af.c | 32 ++++++++++++++++++++++++++++----
 libaf/af.h | 18 ++++++++++++++++++
 2 files changed, 46 insertions(+), 4 deletions(-)

diff --git a/libaf/af.c b/libaf/af.c
index 393f6e3cb1..e4d496464d 100644
--- a/libaf/af.c
+++ b/libaf/af.c
@@ -156,7 +156,9 @@ void af_remove(af_stream_t* s, af_instance_t* af)
   free(af);
 }
 
-/* Reinitializes all filters downstream from the filter given in the argument */
+/* Reinitializes all filters downstream from the filter given in the
+   argument the return value is AF_OK if success and AF_ERROR if
+   failure */
 int af_reinit(af_stream_t* s, af_instance_t* af)
 {
   if(!af)
@@ -364,6 +366,31 @@ int af_init(af_stream_t* s)
   return 0;
 }
 
+/* Add filter during execution. This function adds the filter "name"
+   to the stream s. The filter will be inserted somewhere nice in the
+   list of filters. The return value is a pointer to the new filter,
+   If the filter couldn't be added the return value is NULL. */
+af_instance_t* af_add(af_stream_t* s, char* name){
+  af_instance_t* new;
+  // Sanity check
+  if(!s || !s->first || !name)
+    return NULL;
+  // Insert the filter somwhere nice
+  if(!strcmp(s->first->info->name,"format"))
+    new = af_append(s, s->first, name);
+  else
+    new = af_prepend(s, s->first, name);
+  if(!new)
+    return NULL;
+
+  // Reinitalize the filter list
+  if(AF_OK != af_reinit(s, s->first)){
+    free(new);
+    return NULL;
+  }
+  return new;
+}
+
 // Filter data chunk through the filters in the list
 af_data_t* af_play(af_stream_t* s, af_data_t* data)
 {
@@ -451,9 +478,6 @@ int af_calc_insize_constrained(af_stream_t* s, int len,
     in+=t;
   }
   
-//  printf("Could no meet constraint nr 3.  in=%d out=%d len=%d max_in=%d max_out=%d",
-//      in,out,len,max_insize,max_outsize);
-  
   // Could no meet constraint nr 3.
   while(out > max_outsize || in > max_insize){
     in-=t;
diff --git a/libaf/af.h b/libaf/af.h
index 84f82b5d7e..26309aaf1b 100644
--- a/libaf/af.h
+++ b/libaf/af.h
@@ -138,19 +138,37 @@ typedef struct af_stream_s
    stream will be reinitialized. The return value is 0 if sucess and
    -1 if failure */
 int af_init(af_stream_t* s);
+
 // Uninit and remove all filters
 void af_uninit(af_stream_t* s);
+
+/* Add filter during execution. This function adds the filter "name"
+   to the stream s. The filter will be inserted somewhere nice in the
+   list of filters. The return value is a pointer to the new filter,
+   If the filter couldn't be added the return value is NULL. */
+af_instance_t* af_add(af_stream_t* s, char* name);
+
+// Uninit and remove the filter "af"
+void af_remove(af_stream_t* s, af_instance_t* af);
+
+/* Find filter in the dynamic filter list using it's name This
+   function is used for finding already initialized filters */
+af_instance_t* af_get(af_stream_t* s, char* name);
+
 // Filter data chunk through the filters in the list
 af_data_t* af_play(af_stream_t* s, af_data_t* data);
+
 /* Calculate how long the output from the filters will be given the
    input length "len". The calculated length is >= the actual
    length */
 int af_outputlen(af_stream_t* s, int len);
+
 /* Calculate how long the input to the filters should be to produce a
    certain output length, i.e. the return value of this function is
    the input length required to produce the output length "len". The
    calculated length is <= the actual length */
 int af_inputlen(af_stream_t* s, int len);
+
 /* Calculate how long the input IN to the filters should be to produce
    a certain output length OUT but with the following three constraints:
    1. IN <= max_insize, where max_insize is the maximum possible input