alacenc: add support for multi-channel encoding

1 files changed, 56 insertions, 0 deletions

diff --git a/libavcodec/alac_data.c b/libavcodec/alac_data.c
new file mode 100644
index 0000000000..9e131199b1
--- /dev/null
+++ b/libavcodec/alac_data.c
@@ -0,0 +1,56 @@
+/*
+ * ALAC encoder and decoder common data
+ *
+ * This file is part of Libav.
+ *
+ * Libav 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.
+ *
+ * Libav 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 Libav; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include "libavutil/channel_layout.h"
+#include "alac_data.h"
+
+const uint8_t ff_alac_channel_layout_offsets[ALAC_MAX_CHANNELS][ALAC_MAX_CHANNELS] = {
+    { 0 },
+    { 0, 1 },
+    { 2, 0, 1 },
+    { 2, 0, 1, 3 },
+    { 2, 0, 1, 3, 4 },
+    { 2, 0, 1, 4, 5, 3 },
+    { 2, 0, 1, 4, 5, 6, 3 },
+    { 2, 6, 7, 0, 1, 4, 5, 3 }
+};
+
+const uint64_t ff_alac_channel_layouts[ALAC_MAX_CHANNELS + 1] = {
+    AV_CH_LAYOUT_MONO,
+    AV_CH_LAYOUT_STEREO,
+    AV_CH_LAYOUT_SURROUND,
+    AV_CH_LAYOUT_4POINT0,
+    AV_CH_LAYOUT_5POINT0_BACK,
+    AV_CH_LAYOUT_5POINT1_BACK,
+    AV_CH_LAYOUT_6POINT1_BACK,
+    AV_CH_LAYOUT_7POINT1_WIDE_BACK,
+    0
+};
+
+const enum AlacRawDataBlockType ff_alac_channel_elements[ALAC_MAX_CHANNELS][5] = {
+    { TYPE_SCE,                                         },
+    { TYPE_CPE,                                         },
+    { TYPE_SCE, TYPE_CPE,                               },
+    { TYPE_SCE, TYPE_CPE, TYPE_SCE                      },
+    { TYPE_SCE, TYPE_CPE, TYPE_CPE,                     },
+    { TYPE_SCE, TYPE_CPE, TYPE_CPE, TYPE_SCE,           },
+    { TYPE_SCE, TYPE_CPE, TYPE_CPE, TYPE_SCE, TYPE_SCE, },
+    { TYPE_SCE, TYPE_CPE, TYPE_CPE, TYPE_CPE, TYPE_SCE, },
+};