making act segmenter

1 files changed, 50 insertions, 0 deletions

diff --git a/ffmpeg/libavcodec/mpegaudio.c b/ffmpeg/libavcodec/mpegaudio.c
new file mode 100644
index 0000000..cba5299
--- /dev/null
+++ b/ffmpeg/libavcodec/mpegaudio.c
@@ -0,0 +1,50 @@
+/*
+ * MPEG Audio common code
+ * Copyright (c) 2001, 2002 Fabrice Bellard
+ *
+ * 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
+ */
+
+/**
+ * @file
+ * MPEG Audio common code.
+ */
+
+#include "mpegaudio.h"
+
+
+/* bitrate is in kb/s */
+int ff_mpa_l2_select_table(int bitrate, int nb_channels, int freq, int lsf)
+{
+    int ch_bitrate, table;
+
+    ch_bitrate = bitrate / nb_channels;
+    if (!lsf) {
+        if ((freq == 48000 && ch_bitrate >= 56) ||
+            (ch_bitrate >= 56 && ch_bitrate <= 80))
+            table = 0;
+        else if (freq != 48000 && ch_bitrate >= 96)
+            table = 1;
+        else if (freq != 32000 && ch_bitrate <= 48)
+            table = 2;
+        else
+            table = 3;
+    } else {
+        table = 4;
+    }
+    return table;
+}