1 files changed, 90 insertions, 0 deletions
diff --git a/libmediafork/declpcm.c b/libmediafork/declpcm.c
new file mode 100644
index 000000000..718cf559d
--- /dev/null
+++ b/libmediafork/declpcm.c
@@ -0,0 +1,90 @@
+/* $Id: declpcm.c,v 1.8 2005/11/04 14:44:01 titer Exp $
+
+   This file is part of the HandBrake source code.
+   Homepage: <http://handbrake.m0k.org/>.
+   It may be used under the terms of the GNU General Public License. */
+
+#include "mediafork.h"
+
+int  declpcmInit( hb_work_object_t *, hb_job_t * );
+int  declpcmWork( hb_work_object_t *, hb_buffer_t **, hb_buffer_t ** );
+void declpcmClose( hb_work_object_t * );
+
+hb_work_object_t hb_declpcm =
+{   
+    WORK_DECLPCM,
+    "LPCM decoder",
+    declpcmInit,
+    declpcmWork,
+    declpcmClose
+};
+
+int declpcmInit( hb_work_object_t * w, hb_job_t * job )
+{
+    return 0;
+}
+
+int declpcmWork( hb_work_object_t * w, hb_buffer_t ** buf_in,
+                 hb_buffer_t ** buf_out )
+{
+    hb_buffer_t * in = *buf_in, * out;
+    int samplerate = 0;
+    int count;
+    uint8_t * samples_u8;
+    float   * samples_fl32;
+    int i;
+    uint64_t duration;
+
+    *buf_out = NULL;
+
+    if( in->data[5] != 0x80 )
+    {
+        hb_log( "no LPCM frame sync (%02x)", in->data[5] );
+        return HB_WORK_OK;
+    }
+
+    switch( ( in->data[4] >> 4 ) & 0x3 )
+    {
+        case 0:
+            samplerate = 48000;
+            break;
+        case 1:
+            samplerate = 96000;//32000; /* FIXME vlc says it is 96000 */
+            break;
+        case 2:
+            samplerate = 44100;
+            break;
+        case 3:
+            samplerate = 32000;
+            break;
+    }
+
+    count       = ( in->size - 6 ) / 2;
+    out         = hb_buffer_init( count * sizeof( float ) );
+    duration    = count * 90000 / samplerate / 2;
+    out->start  = in->start;
+    out->stop   = out->start + duration;
+
+    samples_u8   = in->data + 6;
+    samples_fl32 = (float *) out->data;
+
+    /* Big endian int16 -> float conversion */
+    for( i = 0; i < count; i++ )
+    {
+#ifdef WORDS_BIGENDIAN
+        samples_fl32[0] = *( (int16_t *) samples_u8 );
+#else
+        samples_fl32[0] = (int16_t) ( ( samples_u8[0] << 8 ) | samples_u8[1] );
+#endif
+        samples_u8   += 2;
+        samples_fl32 += 1;
+    }
+
+    *buf_out = out;
+
+    return HB_WORK_OK;
+}
+
+void declpcmClose( hb_work_object_t * w )
+{
+}