1 files changed, 88 insertions, 0 deletions
diff --git a/libmpcodecs/ad_hwac3.c b/libmpcodecs/ad_hwac3.c
new file mode 100644
index 0000000000..fb92d5b593
--- /dev/null
+++ b/libmpcodecs/ad_hwac3.c
@@ -0,0 +1,88 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+#include "config.h"
+#include "mp_msg.h"
+#include "help_mp.h"
+
+#include "ad_internal.h"
+
+#include "../liba52/a52.h"
+#include "../ac3-iec958.h"
+
+extern int a52_fillbuff(sh_audio_t *sh_audio);
+
+static ad_info_t info = 
+{
+	"AC3 through SPDIF",
+	"hwac3",
+	AFM_HWAC3,
+	"Nick Kurshev",
+	"???",
+	""
+};
+
+LIBAD_EXTERN(hwac3)
+
+static int preinit(sh_audio_t *sh)
+{
+  /* Dolby AC3 audio: */
+  sh->audio_out_minsize=4*256*6;
+  sh->channels=2;
+  return 1;
+}
+
+static int init(sh_audio_t *sh_audio)
+{
+  /* Dolby AC3 passthrough:*/
+  sample_t *a52_samples=a52_init(0);
+  if (a52_samples == NULL) {
+       mp_msg(MSGT_DECAUDIO,MSGL_ERR,"A52 init failed\n");
+       return 0;
+  }
+  sh_audio->a_in_buffer_size=3840;
+  sh_audio->a_in_buffer=malloc(sh_audio->a_in_buffer_size);
+  sh_audio->a_in_buffer_len=0;
+  if(a52_fillbuff(sh_audio)<0) {
+       mp_msg(MSGT_DECAUDIO,MSGL_ERR,"A52 sync failed\n");
+       return 0;
+  }
+ /* 
+  sh_audio->samplerate=ai.samplerate;   // SET by a52_fillbuff()
+  sh_audio->samplesize=ai.framesize;
+  sh_audio->i_bps=ai.bitrate*(1000/8);  // SET by a52_fillbuff()
+  sh_audio->ac3_frame=malloc(6144);
+  sh_audio->o_bps=sh_audio->i_bps;  // XXX FIXME!!! XXX
+
+   o_bps is calculated from samplesize*channels*samplerate
+   a single ac3 frame is always translated to 6144 byte packet. (zero padding)*/
+  sh_audio->channels=2;
+  sh_audio->samplesize=2;   /* 2*2*(6*256) = 6144 (very TRICKY!)*/
+  return 1;
+}
+
+static void uninit(sh_audio_t *sh)
+{
+}
+
+static int control(sh_audio_t *sh,int cmd,void* arg, ...)
+{
+    switch(cmd)
+    {
+      case ADCTRL_SKIP_FRAME:
+	  a52_fillbuff(sh); break; // skip AC3 frame
+	  return CONTROL_TRUE;
+    }
+  return CONTROL_UNKNOWN;
+}
+
+static int decode_audio(sh_audio_t *sh_audio,unsigned char *buf,int minlen,int maxlen)
+{
+  int len=-1;
+  if(!sh_audio->a_in_buffer_len)
+    if((len=a52_fillbuff(sh_audio))<0) return len; /*EOF*/
+  sh_audio->a_in_buffer_len=0;
+  len = ac3_iec958_build_burst(len, 0x01, 1, sh_audio->a_in_buffer, buf);
+  return len;
+}