From 1f6c494641c4ca99eec7a9f47818526c72789439 Mon Sep 17 00:00:00 2001
From: anders <anders@b3059339-0415-0410-9bf9-f77b7e298cf2>
Date: Tue, 1 Oct 2002 06:45:08 +0000
Subject: Adding new audio output filter layer libaf

git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@7569 b3059339-0415-0410-9bf9-f77b7e298cf2
---
 libaf/af_channels.c | 171 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 171 insertions(+)
 create mode 100644 libaf/af_channels.c

(limited to 'libaf/af_channels.c')

diff --git a/libaf/af_channels.c b/libaf/af_channels.c
new file mode 100644
index 0000000000..9943e573aa
--- /dev/null
+++ b/libaf/af_channels.c
@@ -0,0 +1,171 @@
+/* Audio filter that adds and removes channels, according to the
+   command line parameter channels. It is stupid and can only add
+   silence or copy channels not mix or filter.
+*/
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "../config.h"
+#include "../mp_msg.h"
+
+#include "af.h"
+
+// Local function for copying data
+void copy(void* in, void* out, int ins, int inos,int outs, int outos, int len, int bps)
+{
+  switch(bps){
+  case 1:{
+    int8_t* tin  = (int8_t*)in;
+    int8_t* tout = (int8_t*)out;
+    tin  += inos;
+    tout += outos;
+    len = len/ins;
+    while(len--){
+      *tout=*tin;
+      tin +=ins;
+      tout+=outs;
+    }
+    break;
+  }
+  case 2:{
+    int16_t* tin  = (int16_t*)in;
+    int16_t* tout = (int16_t*)out;
+    tin  += inos;
+    tout += outos;
+    len = len/(2*ins);
+    while(len--){
+      *tout=*tin;
+      tin +=ins;
+      tout+=outs;
+    }
+    break;
+  }
+  case 4:{
+    int32_t* tin  = (int32_t*)in;
+    int32_t* tout = (int32_t*)out;
+    tin  += inos;
+    tout += outos;
+    len = len/(4*ins);
+    while(len--){
+      *tout=*tin;
+      tin +=ins;
+      tout+=outs;
+    }
+    break;
+  }
+  case 8:{
+    int64_t* tin  = (int64_t*)in;
+    int64_t* tout = (int64_t*)out;
+    tin  += inos;
+    tout += outos;
+    len = len/(8*ins);
+    while(len--){
+      *tout=*tin;
+      tin +=ins;
+      tout+=outs;
+    }
+    break;
+  }
+  default:
+    mp_msg(MSGT_AFILTER,MSGL_ERR,"[channels] Unsupported number of bytes/sample: %i please report this error on the MPlayer mailing list. \n",bps);
+  }
+}
+
+// Initialization and runtime control
+static int control(struct af_instance_s* af, int cmd, void* arg)
+{
+  switch(cmd){
+  case AF_CONTROL_REINIT:
+    // Make sure this filter isn't redundant 
+    if(af->data->nch == ((af_data_t*)arg)->nch)
+      return AF_DETACH;
+
+    af->data->rate   = ((af_data_t*)arg)->rate;
+    af->data->format = ((af_data_t*)arg)->format;
+    af->data->bps    = ((af_data_t*)arg)->bps;
+    af->mul.n        = af->data->nch;
+    af->mul.d	     = ((af_data_t*)arg)->nch;
+    return AF_OK;
+  case AF_CONTROL_CHANNELS: 
+    // Reinit must be called after this function has been called
+    
+    // Sanity check
+    if(((int*)arg)[0] <= 0 || ((int*)arg)[0] > 6){
+      mp_msg(MSGT_AFILTER,MSGL_ERR,"[channels] The number of output channels must be between 1 and 6. Current value is%i \n",((int*)arg)[0]);
+      return AF_ERROR;
+    }
+
+    af->data->nch=((int*)arg)[0]; 
+    mp_msg(MSGT_AFILTER,MSGL_V,"[channels] Changing number of channels to %i\n",af->data->nch);
+    return AF_OK;
+  }
+  return AF_UNKNOWN;
+}
+
+// Deallocate memory 
+static void uninit(struct af_instance_s* af)
+{
+  if(af->data)
+    free(af->data);
+}
+
+// Filter data through filter
+static af_data_t* play(struct af_instance_s* af, af_data_t* data)
+{
+  af_data_t*   c = data;			// Current working data
+  af_data_t*   l = af->data;	 		// Local data
+
+  if(AF_OK != RESIZE_LOCAL_BUFFER(af,data))
+    return NULL;
+
+  // Reset unused channels if nch in < nch out
+  if(af->mul.n > af->mul.d)
+    memset(l->audio,0,af_lencalc(af->mul, c->len));
+  
+  // Special case always output L & R
+  if(c->nch == 1){
+    copy(c->audio,l->audio,1,0,l->nch,0,c->len,c->bps);
+    copy(c->audio,l->audio,1,0,l->nch,1,c->len,c->bps);
+  }
+  else{
+    int i;
+    if(l->nch < c->nch){ 
+      for(i=0;i<l->nch;i++) // Truncates R if l->nch == 1 not good need mixing
+	copy(c->audio,l->audio,c->nch,i,l->nch,i,c->len,c->bps);	
+    }
+    else{
+      for(i=0;i<c->nch;i++)
+	copy(c->audio,l->audio,c->nch,i,l->nch,i,c->len,c->bps);	
+    }
+  }
+  
+  // Set output data
+  c->audio = l->audio;
+  c->len   = af_lencalc(af->mul, c->len);
+  c->nch   = l->nch;
+
+  return c;
+}
+
+// Allocate memory and set function pointers
+static int open(af_instance_t* af){
+  af->control=control;
+  af->uninit=uninit;
+  af->play=play;
+  af->mul.n=1;
+  af->mul.d=1;
+  af->data=calloc(1,sizeof(af_data_t));
+  if(af->data == NULL)
+    return AF_ERROR;
+  return AF_OK;
+}
+
+// Description of this filter
+af_info_t af_info_channels = {
+  "Insert or remove channels",
+  "channels",
+  "Anders",
+  "",
+  open
+};
-- 
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