avcodec: add dvaudio parser

Signed-off-by: Paul B Mahol <onemda@gmail.com>

1 files changed, 32 insertions, 0 deletions

diff --git a/libavcodec/dvaudio.h b/libavcodec/dvaudio.h
new file mode 100644
index 0000000..e4d0df1
--- /dev/null
+++ b/libavcodec/dvaudio.h
@@ -0,0 +1,32 @@
+/*
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+static inline int dv_get_audio_sample_count(const uint8_t *buffer, int dsf)
+{
+    int samples = buffer[0] & 0x3f; /* samples in this frame - min samples */
+
+    switch ((buffer[3] >> 3) & 0x07) {
+    case 0:
+        return samples + (dsf ? 1896 : 1580);
+    case 1:
+        return samples + (dsf ? 1742 : 1452);
+    case 2:
+    default:
+        return samples + (dsf ? 1264 : 1053);
+    }
+}