1 files changed, 57 insertions, 0 deletions
diff --git a/libmpcodecs/ad_msgsm.c b/libmpcodecs/ad_msgsm.c
new file mode 100644
index 0000000000..a45cfd402b
--- /dev/null
+++ b/libmpcodecs/ad_msgsm.c
@@ -0,0 +1,57 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+#include "config.h"
+#include "ad_internal.h"
+
+static ad_info_t info = 
+{
+	"native MSGSM audio decoder",
+	"msgsm",
+	AFM_GSM,
+	"A'rpi",
+	"XAnim",
+	""
+};
+
+LIBAD_EXTERN(msgsm)
+
+#include "xa/xa_gsm.h"
+
+static int init(sh_audio_t *sh_audio)
+{
+  if(!sh_audio->wf) return 0;
+  // MS-GSM audio codec:
+  GSM_Init();
+  sh_audio->channels=sh_audio->wf->nChannels;
+  sh_audio->samplerate=sh_audio->wf->nSamplesPerSec;
+  // decodes 65 byte -> 320 short
+  // 1 sec: sh_audio->channels*sh_audio->samplerate  samples
+  // 1 frame: 320 samples
+  sh_audio->i_bps=65*(sh_audio->channels*sh_audio->samplerate)/320;  // 1:10
+  return 1;
+}
+
+static int preinit(sh_audio_t *sh_audio)
+{
+  sh_audio->audio_out_minsize=4*320;
+  return 1;
+}
+
+static void uninit(sh_audio_t *sh)
+{
+}
+
+static int control(sh_audio_t *sh,int cmd,void* arg, ...)
+{
+  return CONTROL_UNKNOWN;
+}
+
+static int decode_audio(sh_audio_t *sh_audio,unsigned char *buf,int minlen,int maxlen)
+{
+    unsigned char ibuf[65]; // 65 bytes / frame
+    if(demux_read_data(sh_audio->ds,ibuf,65)!=65) return -1; // EOF
+    XA_MSGSM_Decoder(ibuf,(unsigned short *) buf); // decodes 65 byte -> 320 short
+    return 2*320;
+}