1 files changed, 137 insertions, 0 deletions
diff --git a/libhb/decavcodec.c b/libhb/decavcodec.c
new file mode 100644
index 000000000..f18579f36
--- /dev/null
+++ b/libhb/decavcodec.c
@@ -0,0 +1,137 @@
+/* $Id: decavcodec.c,v 1.6 2005/03/06 04:08:54 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 "hb.h"
+
+#include "ffmpeg/avcodec.h"
+
+struct hb_work_object_s
+{
+    HB_WORK_COMMON;
+
+    hb_job_t       * job;
+    hb_audio_t     * audio;
+
+    AVCodecContext * context;
+    int64_t          pts_last;
+};
+
+
+/***********************************************************************
+ * Local prototypes
+ **********************************************************************/
+static int  Work( hb_work_object_t * w, hb_buffer_t ** buf_in,
+                  hb_buffer_t ** buf_out );
+static void Close( hb_work_object_t ** _w );
+
+/***********************************************************************
+ * hb_work_decavcodec_init
+ ***********************************************************************
+ *
+ **********************************************************************/
+hb_work_object_t * hb_work_decavcodec_init( hb_job_t * job,
+                                            hb_audio_t * audio )
+{
+    hb_work_object_t * w = calloc( sizeof( hb_work_object_t ), 1 );
+    AVCodec * codec;
+    w->name  = strdup( "MPGA decoder (libavcodec)" );
+    w->work  = Work;
+    w->close = Close;
+
+    w->job   = job;
+    w->audio = audio;
+
+    codec = avcodec_find_decoder( CODEC_ID_MP2 );
+    w->context = avcodec_alloc_context();
+    avcodec_open( w->context, codec );
+    w->pts_last = -1;
+
+    return w;
+}
+
+/***********************************************************************
+ * Close
+ ***********************************************************************
+ *
+ **********************************************************************/
+static void Close( hb_work_object_t ** _w )
+{
+    hb_work_object_t * w = *_w;
+    avcodec_close( w->context );
+    free( w->name );
+    free( w );
+    *_w = NULL;
+}
+
+/***********************************************************************
+ * Work
+ ***********************************************************************
+ *
+ **********************************************************************/
+static int Work( hb_work_object_t * w, hb_buffer_t ** buf_in,
+                 hb_buffer_t ** buf_out )
+{
+    hb_buffer_t * in = *buf_in, * buf, * last = NULL;
+    int   pos, len, out_size, i;
+    short buffer[AVCODEC_MAX_AUDIO_FRAME_SIZE];
+    uint64_t cur;
+
+    *buf_out = NULL;
+
+    if( in->start < 0 ||
+        ( w->pts_last > 0 &&
+          in->start > w->pts_last &&
+          in->start - w->pts_last < 5000 ) ) /* Hacky */
+    {
+        cur = w->pts_last;
+    }
+    else
+    {
+        cur = in->start;
+    }
+
+    pos = 0;
+    while( pos < in->size )
+    {
+        len = avcodec_decode_audio( w->context, buffer, &out_size,
+                                    in->data + pos, in->size - pos );
+        if( out_size )
+        {
+            short * s16;
+            float * fl32;
+
+            buf = hb_buffer_init( 2 * out_size );
+
+            buf->start = cur;
+            buf->stop  = cur + 90000 * ( out_size / 4 ) /
+                         w->context->sample_rate;
+            cur = buf->stop;
+
+            s16  = buffer;
+            fl32 = (float *) buf->data;
+            for( i = 0; i < out_size / 2; i++ )
+            {
+                fl32[i] = s16[i];
+            }
+
+            if( last )
+            {
+                last = last->next = buf;
+            }
+            else
+            {
+                *buf_out = last = buf;
+            }
+        }
+
+        pos += len;
+    }
+
+    w->pts_last = cur;
+
+    return HB_WORK_OK;
+}
+