summaryrefslogtreecommitdiff
path: root/ffmpeg1/libavcodec/cavsdec.c
diff options
context:
space:
mode:
Diffstat (limited to 'ffmpeg1/libavcodec/cavsdec.c')
-rw-r--r--ffmpeg1/libavcodec/cavsdec.c1226
1 files changed, 1226 insertions, 0 deletions
diff --git a/ffmpeg1/libavcodec/cavsdec.c b/ffmpeg1/libavcodec/cavsdec.c
new file mode 100644
index 0000000..2ef3eb3
--- /dev/null
+++ b/ffmpeg1/libavcodec/cavsdec.c
@@ -0,0 +1,1226 @@
+/*
+ * Chinese AVS video (AVS1-P2, JiZhun profile) decoder.
+ * Copyright (c) 2006 Stefan Gehrer <stefan.gehrer@gmx.de>
+ *
+ * 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
+ * Chinese AVS video (AVS1-P2, JiZhun profile) decoder
+ * @author Stefan Gehrer <stefan.gehrer@gmx.de>
+ */
+
+#include "libavutil/avassert.h"
+#include "avcodec.h"
+#include "get_bits.h"
+#include "golomb.h"
+#include "cavs.h"
+#include "internal.h"
+#include "mpeg12data.h"
+#include "mpegvideo.h"
+
+static const uint8_t mv_scan[4] = {
+ MV_FWD_X0, MV_FWD_X1,
+ MV_FWD_X2, MV_FWD_X3
+};
+
+static const uint8_t cbp_tab[64][2] = {
+ { 63, 0 }, { 15, 15 }, { 31, 63 }, { 47, 31 }, { 0, 16 }, { 14, 32 }, { 13, 47 }, { 11, 13 },
+ { 7, 14 }, { 5, 11 }, { 10, 12 }, { 8, 5 }, { 12, 10 }, { 61, 7 }, { 4, 48 }, { 55, 3 },
+ { 1, 2 }, { 2, 8 }, { 59, 4 }, { 3, 1 }, { 62, 61 }, { 9, 55 }, { 6, 59 }, { 29, 62 },
+ { 45, 29 }, { 51, 27 }, { 23, 23 }, { 39, 19 }, { 27, 30 }, { 46, 28 }, { 53, 9 }, { 30, 6 },
+ { 43, 60 }, { 37, 21 }, { 60, 44 }, { 16, 26 }, { 21, 51 }, { 28, 35 }, { 19, 18 }, { 35, 20 },
+ { 42, 24 }, { 26, 53 }, { 44, 17 }, { 32, 37 }, { 58, 39 }, { 24, 45 }, { 20, 58 }, { 17, 43 },
+ { 18, 42 }, { 48, 46 }, { 22, 36 }, { 33, 33 }, { 25, 34 }, { 49, 40 }, { 40, 52 }, { 36, 49 },
+ { 34, 50 }, { 50, 56 }, { 52, 25 }, { 54, 22 }, { 41, 54 }, { 56, 57 }, { 38, 41 }, { 57, 38 }
+};
+
+static const uint8_t scan3x3[4] = { 4, 5, 7, 8 };
+
+static const uint8_t cavs_chroma_qp[64] = {
+ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15,
+ 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31,
+ 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 42, 43, 43, 44, 44,
+ 45, 45, 46, 46, 47, 47, 48, 48, 48, 49, 49, 49, 50, 50, 50, 51
+};
+
+static const uint8_t dequant_shift[64] = {
+ 14, 14, 14, 14, 14, 14, 14, 14,
+ 13, 13, 13, 13, 13, 13, 13, 13,
+ 13, 12, 12, 12, 12, 12, 12, 12,
+ 11, 11, 11, 11, 11, 11, 11, 11,
+ 11, 10, 10, 10, 10, 10, 10, 10,
+ 10, 9, 9, 9, 9, 9, 9, 9,
+ 9, 8, 8, 8, 8, 8, 8, 8,
+ 7, 7, 7, 7, 7, 7, 7, 7
+};
+
+static const uint16_t dequant_mul[64] = {
+ 32768, 36061, 38968, 42495, 46341, 50535, 55437, 60424,
+ 32932, 35734, 38968, 42495, 46177, 50535, 55109, 59933,
+ 65535, 35734, 38968, 42577, 46341, 50617, 55027, 60097,
+ 32809, 35734, 38968, 42454, 46382, 50576, 55109, 60056,
+ 65535, 35734, 38968, 42495, 46320, 50515, 55109, 60076,
+ 65535, 35744, 38968, 42495, 46341, 50535, 55099, 60087,
+ 65535, 35734, 38973, 42500, 46341, 50535, 55109, 60097,
+ 32771, 35734, 38965, 42497, 46341, 50535, 55109, 60099
+};
+
+#define EOB 0, 0, 0
+
+static const struct dec_2dvlc intra_dec[7] = {
+ {
+ { //level / run / table_inc
+ { 1, 1, 1 }, { -1, 1, 1 }, { 1, 2, 1 }, { -1, 2, 1 }, { 1, 3, 1 }, { -1, 3, 1 },
+ { 1, 4, 1 }, { -1, 4, 1 }, { 1, 5, 1 }, { -1, 5, 1 }, { 1, 6, 1 }, { -1, 6, 1 },
+ { 1, 7, 1 }, { -1, 7, 1 }, { 1, 8, 1 }, { -1, 8, 1 }, { 1, 9, 1 }, { -1, 9, 1 },
+ { 1, 10, 1 }, { -1, 10, 1 }, { 1, 11, 1 }, { -1, 11, 1 }, { 2, 1, 2 }, { -2, 1, 2 },
+ { 1, 12, 1 }, { -1, 12, 1 }, { 1, 13, 1 }, { -1, 13, 1 }, { 1, 14, 1 }, { -1, 14, 1 },
+ { 1, 15, 1 }, { -1, 15, 1 }, { 2, 2, 2 }, { -2, 2, 2 }, { 1, 16, 1 }, { -1, 16, 1 },
+ { 1, 17, 1 }, { -1, 17, 1 }, { 3, 1, 3 }, { -3, 1, 3 }, { 1, 18, 1 }, { -1, 18, 1 },
+ { 1, 19, 1 }, { -1, 19, 1 }, { 2, 3, 2 }, { -2, 3, 2 }, { 1, 20, 1 }, { -1, 20, 1 },
+ { 1, 21, 1 }, { -1, 21, 1 }, { 2, 4, 2 }, { -2, 4, 2 }, { 1, 22, 1 }, { -1, 22, 1 },
+ { 2, 5, 2 }, { -2, 5, 2 }, { 1, 23, 1 }, { -1, 23, 1 }, { EOB }
+ },
+ //level_add
+ { 0, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, -1, -1, -1 },
+ 2, //golomb_order
+ 0, //inc_limit
+ 23, //max_run
+ },
+ {
+ { //level / run
+ { 1, 1, 0 }, { -1, 1, 0 }, { 1, 2, 0 }, { -1, 2, 0 }, { 2, 1, 1 }, { -2, 1, 1 },
+ { 1, 3, 0 }, { -1, 3, 0 }, { EOB }, { 1, 4, 0 }, { -1, 4, 0 }, { 1, 5, 0 },
+ { -1, 5, 0 }, { 1, 6, 0 }, { -1, 6, 0 }, { 3, 1, 2 }, { -3, 1, 2 }, { 2, 2, 1 },
+ { -2, 2, 1 }, { 1, 7, 0 }, { -1, 7, 0 }, { 1, 8, 0 }, { -1, 8, 0 }, { 1, 9, 0 },
+ { -1, 9, 0 }, { 2, 3, 1 }, { -2, 3, 1 }, { 4, 1, 2 }, { -4, 1, 2 }, { 1, 10, 0 },
+ { -1, 10, 0 }, { 1, 11, 0 }, { -1, 11, 0 }, { 2, 4, 1 }, { -2, 4, 1 }, { 3, 2, 2 },
+ { -3, 2, 2 }, { 1, 12, 0 }, { -1, 12, 0 }, { 2, 5, 1 }, { -2, 5, 1 }, { 5, 1, 3 },
+ { -5, 1, 3 }, { 1, 13, 0 }, { -1, 13, 0 }, { 2, 6, 1 }, { -2, 6, 1 }, { 1, 14, 0 },
+ { -1, 14, 0 }, { 2, 7, 1 }, { -2, 7, 1 }, { 2, 8, 1 }, { -2, 8, 1 }, { 3, 3, 2 },
+ { -3, 3, 2 }, { 6, 1, 3 }, { -6, 1, 3 }, { 1, 15, 0 }, { -1, 15, 0 }
+ },
+ //level_add
+ { 0, 7, 4, 4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
+ 2, //golomb_order
+ 1, //inc_limit
+ 15, //max_run
+ },
+ {
+ { //level / run
+ { 1, 1, 0 }, { -1, 1, 0 }, { 2, 1, 0 }, { -2, 1, 0 }, { 1, 2, 0 }, { -1, 2, 0 },
+ { 3, 1, 1 }, { -3, 1, 1 }, { EOB }, { 1, 3, 0 }, { -1, 3, 0 }, { 2, 2, 0 },
+ { -2, 2, 0 }, { 4, 1, 1 }, { -4, 1, 1 }, { 1, 4, 0 }, { -1, 4, 0 }, { 5, 1, 2 },
+ { -5, 1, 2 }, { 1, 5, 0 }, { -1, 5, 0 }, { 3, 2, 1 }, { -3, 2, 1 }, { 2, 3, 0 },
+ { -2, 3, 0 }, { 1, 6, 0 }, { -1, 6, 0 }, { 6, 1, 2 }, { -6, 1, 2 }, { 2, 4, 0 },
+ { -2, 4, 0 }, { 1, 7, 0 }, { -1, 7, 0 }, { 4, 2, 1 }, { -4, 2, 1 }, { 7, 1, 2 },
+ { -7, 1, 2 }, { 3, 3, 1 }, { -3, 3, 1 }, { 2, 5, 0 }, { -2, 5, 0 }, { 1, 8, 0 },
+ { -1, 8, 0 }, { 2, 6, 0 }, { -2, 6, 0 }, { 8, 1, 3 }, { -8, 1, 3 }, { 1, 9, 0 },
+ { -1, 9, 0 }, { 5, 2, 2 }, { -5, 2, 2 }, { 3, 4, 1 }, { -3, 4, 1 }, { 2, 7, 0 },
+ { -2, 7, 0 }, { 9, 1, 3 }, { -9, 1, 3 }, { 1, 10, 0 }, { -1, 10, 0 }
+ },
+ //level_add
+ { 0, 10, 6, 4, 4, 3, 3, 3, 2, 2, 2, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
+ 2, //golomb_order
+ 2, //inc_limit
+ 10, //max_run
+ },
+ {
+ { //level / run
+ { 1, 1, 0 }, { -1, 1, 0 }, { 2, 1, 0 }, { -2, 1, 0 }, { 3, 1, 0 }, { -3, 1, 0 },
+ { 1, 2, 0 }, { -1, 2, 0 }, { EOB }, { 4, 1, 0 }, { -4, 1, 0 }, { 5, 1, 1 },
+ { -5, 1, 1 }, { 2, 2, 0 }, { -2, 2, 0 }, { 1, 3, 0 }, { -1, 3, 0 }, { 6, 1, 1 },
+ { -6, 1, 1 }, { 3, 2, 0 }, { -3, 2, 0 }, { 7, 1, 1 }, { -7, 1, 1 }, { 1, 4, 0 },
+ { -1, 4, 0 }, { 8, 1, 2 }, { -8, 1, 2 }, { 2, 3, 0 }, { -2, 3, 0 }, { 4, 2, 0 },
+ { -4, 2, 0 }, { 1, 5, 0 }, { -1, 5, 0 }, { 9, 1, 2 }, { -9, 1, 2 }, { 5, 2, 1 },
+ { -5, 2, 1 }, { 2, 4, 0 }, { -2, 4, 0 }, { 10, 1, 2 }, {-10, 1, 2 }, { 3, 3, 0 },
+ { -3, 3, 0 }, { 1, 6, 0 }, { -1, 6, 0 }, { 11, 1, 3 }, {-11, 1, 3 }, { 6, 2, 1 },
+ { -6, 2, 1 }, { 1, 7, 0 }, { -1, 7, 0 }, { 2, 5, 0 }, { -2, 5, 0 }, { 3, 4, 0 },
+ { -3, 4, 0 }, { 12, 1, 3 }, {-12, 1, 3 }, { 4, 3, 0 }, { -4, 3, 0 }
+ },
+ //level_add
+ { 0, 13, 7, 5, 4, 3, 2, 2, -1, -1, -1 -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
+ 2, //golomb_order
+ 4, //inc_limit
+ 7, //max_run
+ },
+ {
+ { //level / run
+ { 1, 1, 0 }, { -1, 1, 0 }, { 2, 1, 0 }, { -2, 1, 0 }, { 3, 1, 0 }, { -3, 1, 0 },
+ { EOB }, { 4, 1, 0 }, { -4, 1, 0 }, { 5, 1, 0 }, { -5, 1, 0 }, { 6, 1, 0 },
+ { -6, 1, 0 }, { 1, 2, 0 }, { -1, 2, 0 }, { 7, 1, 0 }, { -7, 1, 0 }, { 8, 1, 1 },
+ { -8, 1, 1 }, { 2, 2, 0 }, { -2, 2, 0 }, { 9, 1, 1 }, { -9, 1, 1 }, { 10, 1, 1 },
+ {-10, 1, 1 }, { 1, 3, 0 }, { -1, 3, 0 }, { 3, 2, 0 }, { -3, 2, 0 }, { 11, 1, 2 },
+ {-11, 1, 2 }, { 4, 2, 0 }, { -4, 2, 0 }, { 12, 1, 2 }, {-12, 1, 2 }, { 13, 1, 2 },
+ {-13, 1, 2 }, { 5, 2, 0 }, { -5, 2, 0 }, { 1, 4, 0 }, { -1, 4, 0 }, { 2, 3, 0 },
+ { -2, 3, 0 }, { 14, 1, 2 }, {-14, 1, 2 }, { 6, 2, 0 }, { -6, 2, 0 }, { 15, 1, 2 },
+ {-15, 1, 2 }, { 16, 1, 2 }, {-16, 1, 2 }, { 3, 3, 0 }, { -3, 3, 0 }, { 1, 5, 0 },
+ { -1, 5, 0 }, { 7, 2, 0 }, { -7, 2, 0 }, { 17, 1, 2 }, {-17, 1, 2 }
+ },
+ //level_add
+ { 0,18, 8, 4, 2, 2, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
+ 2, //golomb_order
+ 7, //inc_limit
+ 5, //max_run
+ },
+ {
+ { //level / run
+ { EOB }, { 1, 1, 0 }, { -1, 1, 0 }, { 2, 1, 0 }, { -2, 1, 0 }, { 3, 1, 0 },
+ { -3, 1, 0 }, { 4, 1, 0 }, { -4, 1, 0 }, { 5, 1, 0 }, { -5, 1, 0 }, { 6, 1, 0 },
+ { -6, 1, 0 }, { 7, 1, 0 }, { -7, 1, 0 }, { 8, 1, 0 }, { -8, 1, 0 }, { 9, 1, 0 },
+ { -9, 1, 0 }, { 10, 1, 0 }, {-10, 1, 0 }, { 1, 2, 0 }, { -1, 2, 0 }, { 11, 1, 1 },
+ {-11, 1, 1 }, { 12, 1, 1 }, {-12, 1, 1 }, { 13, 1, 1 }, {-13, 1, 1 }, { 2, 2, 0 },
+ { -2, 2, 0 }, { 14, 1, 1 }, {-14, 1, 1 }, { 15, 1, 1 }, {-15, 1, 1 }, { 3, 2, 0 },
+ { -3, 2, 0 }, { 16, 1, 1 }, {-16, 1, 1 }, { 1, 3, 0 }, { -1, 3, 0 }, { 17, 1, 1 },
+ {-17, 1, 1 }, { 4, 2, 0 }, { -4, 2, 0 }, { 18, 1, 1 }, {-18, 1, 1 }, { 5, 2, 0 },
+ { -5, 2, 0 }, { 19, 1, 1 }, {-19, 1, 1 }, { 20, 1, 1 }, {-20, 1, 1 }, { 6, 2, 0 },
+ { -6, 2, 0 }, { 21, 1, 1 }, {-21, 1, 1 }, { 2, 3, 0 }, { -2, 3, 0 }
+ },
+ //level_add
+ { 0, 22, 7, 3, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
+ 2, //golomb_order
+ 10, //inc_limit
+ 3, //max_run
+ },
+ {
+ { //level / run
+ { EOB }, { 1, 1, 0 }, { -1, 1, 0 }, { 2, 1, 0 }, { -2, 1, 0 }, { 3, 1, 0 },
+ { -3, 1, 0 }, { 4, 1, 0 }, { -4, 1, 0 }, { 5, 1, 0 }, { -5, 1, 0 }, { 6, 1, 0 },
+ { -6, 1, 0 }, { 7, 1, 0 }, { -7, 1, 0 }, { 8, 1, 0 }, { -8, 1, 0 }, { 9, 1, 0 },
+ { -9, 1, 0 }, { 10, 1, 0 }, {-10, 1, 0 }, { 11, 1, 0 }, {-11, 1, 0 }, { 12, 1, 0 },
+ {-12, 1, 0 }, { 13, 1, 0 }, {-13, 1, 0 }, { 14, 1, 0 }, {-14, 1, 0 }, { 15, 1, 0 },
+ {-15, 1, 0 }, { 16, 1, 0 }, {-16, 1, 0 }, { 1, 2, 0 }, { -1, 2, 0 }, { 17, 1, 0 },
+ {-17, 1, 0 }, { 18, 1, 0 }, {-18, 1, 0 }, { 19, 1, 0 }, {-19, 1, 0 }, { 20, 1, 0 },
+ {-20, 1, 0 }, { 21, 1, 0 }, {-21, 1, 0 }, { 2, 2, 0 }, { -2, 2, 0 }, { 22, 1, 0 },
+ {-22, 1, 0 }, { 23, 1, 0 }, {-23, 1, 0 }, { 24, 1, 0 }, {-24, 1, 0 }, { 25, 1, 0 },
+ {-25, 1, 0 }, { 3, 2, 0 }, { -3, 2, 0 }, { 26, 1, 0 }, {-26, 1, 0 }
+ },
+ //level_add
+ { 0, 27, 4, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
+ 2, //golomb_order
+ INT_MAX, //inc_limit
+ 2, //max_run
+ }
+};
+
+static const struct dec_2dvlc inter_dec[7] = {
+ {
+ { //level / run
+ { 1, 1, 1 }, { -1, 1, 1 }, { 1, 2, 1 }, { -1, 2, 1 }, { 1, 3, 1 }, { -1, 3, 1 },
+ { 1, 4, 1 }, { -1, 4, 1 }, { 1, 5, 1 }, { -1, 5, 1 }, { 1, 6, 1 }, { -1, 6, 1 },
+ { 1, 7, 1 }, { -1, 7, 1 }, { 1, 8, 1 }, { -1, 8, 1 }, { 1, 9, 1 }, { -1, 9, 1 },
+ { 1, 10, 1 }, { -1, 10, 1 }, { 1, 11, 1 }, { -1, 11, 1 }, { 1, 12, 1 }, { -1, 12, 1 },
+ { 1, 13, 1 }, { -1, 13, 1 }, { 2, 1, 2 }, { -2, 1, 2 }, { 1, 14, 1 }, { -1, 14, 1 },
+ { 1, 15, 1 }, { -1, 15, 1 }, { 1, 16, 1 }, { -1, 16, 1 }, { 1, 17, 1 }, { -1, 17, 1 },
+ { 1, 18, 1 }, { -1, 18, 1 }, { 1, 19, 1 }, { -1, 19, 1 }, { 3, 1, 3 }, { -3, 1, 3 },
+ { 1, 20, 1 }, { -1, 20, 1 }, { 1, 21, 1 }, { -1, 21, 1 }, { 2, 2, 2 }, { -2, 2, 2 },
+ { 1, 22, 1 }, { -1, 22, 1 }, { 1, 23, 1 }, { -1, 23, 1 }, { 1, 24, 1 }, { -1, 24, 1 },
+ { 1, 25, 1 }, { -1, 25, 1 }, { 1, 26, 1 }, { -1, 26, 1 }, { EOB }
+ },
+ //level_add
+ { 0, 4, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2 },
+ 3, //golomb_order
+ 0, //inc_limit
+ 26 //max_run
+ },
+ {
+ { //level / run
+ { 1, 1, 0 }, { -1, 1, 0 }, { EOB }, { 1, 2, 0 }, { -1, 2, 0 }, { 1, 3, 0 },
+ { -1, 3, 0 }, { 1, 4, 0 }, { -1, 4, 0 }, { 1, 5, 0 }, { -1, 5, 0 }, { 1, 6, 0 },
+ { -1, 6, 0 }, { 2, 1, 1 }, { -2, 1, 1 }, { 1, 7, 0 }, { -1, 7, 0 }, { 1, 8, 0 },
+ { -1, 8, 0 }, { 1, 9, 0 }, { -1, 9, 0 }, { 1, 10, 0 }, { -1, 10, 0 }, { 2, 2, 1 },
+ { -2, 2, 1 }, { 1, 11, 0 }, { -1, 11, 0 }, { 1, 12, 0 }, { -1, 12, 0 }, { 3, 1, 2 },
+ { -3, 1, 2 }, { 1, 13, 0 }, { -1, 13, 0 }, { 1, 14, 0 }, { -1, 14, 0 }, { 2, 3, 1 },
+ { -2, 3, 1 }, { 1, 15, 0 }, { -1, 15, 0 }, { 2, 4, 1 }, { -2, 4, 1 }, { 1, 16, 0 },
+ { -1, 16, 0 }, { 2, 5, 1 }, { -2, 5, 1 }, { 1, 17, 0 }, { -1, 17, 0 }, { 4, 1, 3 },
+ { -4, 1, 3 }, { 2, 6, 1 }, { -2, 6, 1 }, { 1, 18, 0 }, { -1, 18, 0 }, { 1, 19, 0 },
+ { -1, 19, 0 }, { 2, 7, 1 }, { -2, 7, 1 }, { 3, 2, 2 }, { -3, 2, 2 }
+ },
+ //level_add
+ { 0, 5, 4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, -1, -1, -1, -1, -1, -1, -1 },
+ 2, //golomb_order
+ 1, //inc_limit
+ 19 //max_run
+ },
+ {
+ { //level / run
+ { 1, 1, 0 }, { -1, 1, 0 }, { EOB }, { 1, 2, 0 }, { -1, 2, 0 }, { 2, 1, 0 },
+ { -2, 1, 0 }, { 1, 3, 0 }, { -1, 3, 0 }, { 1, 4, 0 }, { -1, 4, 0 }, { 3, 1, 1 },
+ { -3, 1, 1 }, { 2, 2, 0 }, { -2, 2, 0 }, { 1, 5, 0 }, { -1, 5, 0 }, { 1, 6, 0 },
+ { -1, 6, 0 }, { 1, 7, 0 }, { -1, 7, 0 }, { 2, 3, 0 }, { -2, 3, 0 }, { 4, 1, 2 },
+ { -4, 1, 2 }, { 1, 8, 0 }, { -1, 8, 0 }, { 3, 2, 1 }, { -3, 2, 1 }, { 2, 4, 0 },
+ { -2, 4, 0 }, { 1, 9, 0 }, { -1, 9, 0 }, { 1, 10, 0 }, { -1, 10, 0 }, { 5, 1, 2 },
+ { -5, 1, 2 }, { 2, 5, 0 }, { -2, 5, 0 }, { 1, 11, 0 }, { -1, 11, 0 }, { 2, 6, 0 },
+ { -2, 6, 0 }, { 1, 12, 0 }, { -1, 12, 0 }, { 3, 3, 1 }, { -3, 3, 1 }, { 6, 1, 2 },
+ { -6, 1, 2 }, { 4, 2, 2 }, { -4, 2, 2 }, { 1, 13, 0 }, { -1, 13, 0 }, { 2, 7, 0 },
+ { -2, 7, 0 }, { 3, 4, 1 }, { -3, 4, 1 }, { 1, 14, 0 }, { -1, 14, 0 }
+ },
+ //level_add
+ { 0, 7, 5, 4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
+ 2, //golomb_order
+ 2, //inc_limit
+ 14 //max_run
+ },
+ {
+ { //level / run
+ { 1, 1, 0 }, { -1, 1, 0 }, { EOB }, { 2, 1, 0 }, { -2, 1, 0 }, { 1, 2, 0 },
+ { -1, 2, 0 }, { 3, 1, 0 }, { -3, 1, 0 }, { 1, 3, 0 }, { -1, 3, 0 }, { 2, 2, 0 },
+ { -2, 2, 0 }, { 4, 1, 1 }, { -4, 1, 1 }, { 1, 4, 0 }, { -1, 4, 0 }, { 5, 1, 1 },
+ { -5, 1, 1 }, { 1, 5, 0 }, { -1, 5, 0 }, { 3, 2, 0 }, { -3, 2, 0 }, { 2, 3, 0 },
+ { -2, 3, 0 }, { 1, 6, 0 }, { -1, 6, 0 }, { 6, 1, 1 }, { -6, 1, 1 }, { 2, 4, 0 },
+ { -2, 4, 0 }, { 1, 7, 0 }, { -1, 7, 0 }, { 4, 2, 1 }, { -4, 2, 1 }, { 7, 1, 2 },
+ { -7, 1, 2 }, { 3, 3, 0 }, { -3, 3, 0 }, { 1, 8, 0 }, { -1, 8, 0 }, { 2, 5, 0 },
+ { -2, 5, 0 }, { 8, 1, 2 }, { -8, 1, 2 }, { 1, 9, 0 }, { -1, 9, 0 }, { 3, 4, 0 },
+ { -3, 4, 0 }, { 2, 6, 0 }, { -2, 6, 0 }, { 5, 2, 1 }, { -5, 2, 1 }, { 1, 10, 0 },
+ { -1, 10, 0 }, { 9, 1, 2 }, { -9, 1, 2 }, { 4, 3, 1 }, { -4, 3, 1 }
+ },
+ //level_add
+ { 0,10, 6, 5, 4, 3, 3, 2, 2, 2, 2, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
+ 2, //golomb_order
+ 3, //inc_limit
+ 10 //max_run
+ },
+ {
+ { //level / run
+ { 1, 1, 0 }, { -1, 1, 0 }, { EOB }, { 2, 1, 0 }, { -2, 1, 0 }, { 3, 1, 0 },
+ { -3, 1, 0 }, { 1, 2, 0 }, { -1, 2, 0 }, { 4, 1, 0 }, { -4, 1, 0 }, { 5, 1, 0 },
+ { -5, 1, 0 }, { 2, 2, 0 }, { -2, 2, 0 }, { 1, 3, 0 }, { -1, 3, 0 }, { 6, 1, 0 },
+ { -6, 1, 0 }, { 3, 2, 0 }, { -3, 2, 0 }, { 7, 1, 1 }, { -7, 1, 1 }, { 1, 4, 0 },
+ { -1, 4, 0 }, { 8, 1, 1 }, { -8, 1, 1 }, { 2, 3, 0 }, { -2, 3, 0 }, { 4, 2, 0 },
+ { -4, 2, 0 }, { 1, 5, 0 }, { -1, 5, 0 }, { 9, 1, 1 }, { -9, 1, 1 }, { 5, 2, 0 },
+ { -5, 2, 0 }, { 2, 4, 0 }, { -2, 4, 0 }, { 1, 6, 0 }, { -1, 6, 0 }, { 10, 1, 2 },
+ {-10, 1, 2 }, { 3, 3, 0 }, { -3, 3, 0 }, { 11, 1, 2 }, {-11, 1, 2 }, { 1, 7, 0 },
+ { -1, 7, 0 }, { 6, 2, 0 }, { -6, 2, 0 }, { 3, 4, 0 }, { -3, 4, 0 }, { 2, 5, 0 },
+ { -2, 5, 0 }, { 12, 1, 2 }, {-12, 1, 2 }, { 4, 3, 0 }, { -4, 3, 0 }
+ },
+ //level_add
+ { 0, 13, 7, 5, 4, 3, 2, 2, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
+ 2, //golomb_order
+ 6, //inc_limit
+ 7 //max_run
+ },
+ {
+ { //level / run
+ { EOB }, { 1, 1, 0 }, { -1, 1, 0 }, { 2, 1, 0 }, { -2, 1, 0 }, { 3, 1, 0 },
+ { -3, 1, 0 }, { 4, 1, 0 }, { -4, 1, 0 }, { 5, 1, 0 }, { -5, 1, 0 }, { 1, 2, 0 },
+ { -1, 2, 0 }, { 6, 1, 0 }, { -6, 1, 0 }, { 7, 1, 0 }, { -7, 1, 0 }, { 8, 1, 0 },
+ { -8, 1, 0 }, { 2, 2, 0 }, { -2, 2, 0 }, { 9, 1, 0 }, { -9, 1, 0 }, { 1, 3, 0 },
+ { -1, 3, 0 }, { 10, 1, 1 }, { -10, 1, 1 }, { 3, 2, 0 }, { -3, 2, 0 }, { 11, 1, 1 },
+ { -11, 1, 1 }, { 4, 2, 0 }, { -4, 2, 0 }, { 12, 1, 1 }, { -12, 1, 1 }, { 1, 4, 0 },
+ { -1, 4, 0 }, { 2, 3, 0 }, { -2, 3, 0 }, { 13, 1, 1 }, { -13, 1, 1 }, { 5, 2, 0 },
+ { -5, 2, 0 }, { 14, 1, 1 }, { -14, 1, 1 }, { 6, 2, 0 }, { -6, 2, 0 }, { 1, 5, 0 },
+ { -1, 5, 0 }, { 15, 1, 1 }, { -15, 1, 1 }, { 3, 3, 0 }, { -3, 3, 0 }, { 16, 1, 1 },
+ { -16, 1, 1 }, { 2, 4, 0 }, { -2, 4, 0 }, { 7, 2, 0 }, { -7, 2, 0 }
+ },
+ //level_add
+ { 0, 17, 8, 4, 3, 2, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
+ 2, //golomb_order
+ 9, //inc_limit
+ 5 //max_run
+ },
+ {
+ { //level / run
+ { EOB }, { 1, 1, 0 }, { -1, 1, 0 }, { 2, 1, 0 }, { -2, 1, 0 }, { 3, 1, 0 },
+ { -3, 1, 0 }, { 4, 1, 0 }, { -4, 1, 0 }, { 5, 1, 0 }, { -5, 1, 0 }, { 6, 1, 0 },
+ { -6, 1, 0 }, { 7, 1, 0 }, { -7, 1, 0 }, { 1, 2, 0 }, { -1, 2, 0 }, { 8, 1, 0 },
+ { -8, 1, 0 }, { 9, 1, 0 }, { -9, 1, 0 }, { 10, 1, 0 }, { -10, 1, 0 }, { 11, 1, 0 },
+ { -11, 1, 0 }, { 12, 1, 0 }, { -12, 1, 0 }, { 2, 2, 0 }, { -2, 2, 0 }, { 13, 1, 0 },
+ { -13, 1, 0 }, { 1, 3, 0 }, { -1, 3, 0 }, { 14, 1, 0 }, { -14, 1, 0 }, { 15, 1, 0 },
+ { -15, 1, 0 }, { 3, 2, 0 }, { -3, 2, 0 }, { 16, 1, 0 }, { -16, 1, 0 }, { 17, 1, 0 },
+ { -17, 1, 0 }, { 18, 1, 0 }, { -18, 1, 0 }, { 4, 2, 0 }, { -4, 2, 0 }, { 19, 1, 0 },
+ { -19, 1, 0 }, { 20, 1, 0 }, { -20, 1, 0 }, { 2, 3, 0 }, { -2, 3, 0 }, { 1, 4, 0 },
+ { -1, 4, 0 }, { 5, 2, 0 }, { -5, 2, 0 }, { 21, 1, 0 }, { -21, 1, 0 }
+ },
+ //level_add
+ { 0, 22, 6, 3, 2, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
+ 2, //golomb_order
+ INT_MAX, //inc_limit
+ 4 //max_run
+ }
+};
+
+static const struct dec_2dvlc chroma_dec[5] = {
+ {
+ { //level / run
+ { 1, 1, 1 }, { -1, 1, 1 }, { 1, 2, 1 }, { -1, 2, 1 }, { 1, 3, 1 }, { -1, 3, 1 },
+ { 1, 4, 1 }, { -1, 4, 1 }, { 1, 5, 1 }, { -1, 5, 1 }, { 1, 6, 1 }, { -1, 6, 1 },
+ { 1, 7, 1 }, { -1, 7, 1 }, { 2, 1, 2 }, { -2, 1, 2 }, { 1, 8, 1 }, { -1, 8, 1 },
+ { 1, 9, 1 }, { -1, 9, 1 }, { 1, 10, 1 }, { -1, 10, 1 }, { 1, 11, 1 }, { -1, 11, 1 },
+ { 1, 12, 1 }, { -1, 12, 1 }, { 1, 13, 1 }, { -1, 13, 1 }, { 1, 14, 1 }, { -1, 14, 1 },
+ { 1, 15, 1 }, { -1, 15, 1 }, { 3, 1, 3 }, { -3, 1, 3 }, { 1, 16, 1 }, { -1, 16, 1 },
+ { 1, 17, 1 }, { -1, 17, 1 }, { 1, 18, 1 }, { -1, 18, 1 }, { 1, 19, 1 }, { -1, 19, 1 },
+ { 1, 20, 1 }, { -1, 20, 1 }, { 1, 21, 1 }, { -1, 21, 1 }, { 1, 22, 1 }, { -1, 22, 1 },
+ { 2, 2, 2 }, { -2, 2, 2 }, { 1, 23, 1 }, { -1, 23, 1 }, { 1, 24, 1 }, { -1, 24, 1 },
+ { 1, 25, 1 }, { -1, 25, 1 }, { 4, 1, 3 }, { -4, 1, 3 }, { EOB }
+ },
+ //level_add
+ { 0, 5, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, -1 },
+ 2, //golomb_order
+ 0, //inc_limit
+ 25 //max_run
+ },
+ {
+ { //level / run
+ { EOB }, { 1, 1, 0 }, { -1, 1, 0 }, { 1, 2, 0 }, { -1, 2, 0 }, { 2, 1, 1 },
+ { -2, 1, 1 }, { 1, 3, 0 }, { -1, 3, 0 }, { 1, 4, 0 }, { -1, 4, 0 }, { 1, 5, 0 },
+ { -1, 5, 0 }, { 1, 6, 0 }, { -1, 6, 0 }, { 3, 1, 2 }, { -3, 1, 2 }, { 1, 7, 0 },
+ { -1, 7, 0 }, { 1, 8, 0 }, { -1, 8, 0 }, { 2, 2, 1 }, { -2, 2, 1 }, { 1, 9, 0 },
+ { -1, 9, 0 }, { 1, 10, 0 }, { -1, 10, 0 }, { 1, 11, 0 }, { -1, 11, 0 }, { 4, 1, 2 },
+ { -4, 1, 2 }, { 1, 12, 0 }, { -1, 12, 0 }, { 1, 13, 0 }, { -1, 13, 0 }, { 1, 14, 0 },
+ { -1, 14, 0 }, { 2, 3, 1 }, { -2, 3, 1 }, { 1, 15, 0 }, { -1, 15, 0 }, { 2, 4, 1 },
+ { -2, 4, 1 }, { 5, 1, 3 }, { -5, 1, 3 }, { 3, 2, 2 }, { -3, 2, 2 }, { 1, 16, 0 },
+ { -1, 16, 0 }, { 1, 17, 0 }, { -1, 17, 0 }, { 1, 18, 0 }, { -1, 18, 0 }, { 2, 5, 1 },
+ { -2, 5, 1 }, { 1, 19, 0 }, { -1, 19, 0 }, { 1, 20, 0 }, { -1, 20, 0 }
+ },
+ //level_add
+ { 0, 6, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, -1, -1, -1, -1, -1, -1 },
+ 0, //golomb_order
+ 1, //inc_limit
+ 20 //max_run
+ },
+ {
+ { //level / run
+ { 1, 1, 0 }, { -1, 1, 0 }, { EOB }, { 2, 1, 0 }, { -2, 1, 0 }, { 1, 2, 0 },
+ { -1, 2, 0 }, { 3, 1, 1 }, { -3, 1, 1 }, { 1, 3, 0 }, { -1, 3, 0 }, { 4, 1, 1 },
+ { -4, 1, 1 }, { 2, 2, 0 }, { -2, 2, 0 }, { 1, 4, 0 }, { -1, 4, 0 }, { 5, 1, 2 },
+ { -5, 1, 2 }, { 1, 5, 0 }, { -1, 5, 0 }, { 3, 2, 1 }, { -3, 2, 1 }, { 2, 3, 0 },
+ { -2, 3, 0 }, { 1, 6, 0 }, { -1, 6, 0 }, { 6, 1, 2 }, { -6, 1, 2 }, { 1, 7, 0 },
+ { -1, 7, 0 }, { 2, 4, 0 }, { -2, 4, 0 }, { 7, 1, 2 }, { -7, 1, 2 }, { 1, 8, 0 },
+ { -1, 8, 0 }, { 4, 2, 1 }, { -4, 2, 1 }, { 1, 9, 0 }, { -1, 9, 0 }, { 3, 3, 1 },
+ { -3, 3, 1 }, { 2, 5, 0 }, { -2, 5, 0 }, { 2, 6, 0 }, { -2, 6, 0 }, { 8, 1, 2 },
+ { -8, 1, 2 }, { 1, 10, 0 }, { -1, 10, 0 }, { 1, 11, 0 }, { -1, 11, 0 }, { 9, 1, 2 },
+ { -9, 1, 2 }, { 5, 2, 2 }, { -5, 2, 2 }, { 3, 4, 1 }, { -3, 4, 1 },
+ },
+ //level_add
+ { 0,10, 6, 4, 4, 3, 3, 2, 2, 2, 2, 2, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
+ 1, //golomb_order
+ 2, //inc_limit
+ 11 //max_run
+ },
+ {
+ { //level / run
+ { EOB }, { 1, 1, 0 }, { -1, 1, 0 }, { 2, 1, 0 }, { -2, 1, 0 }, { 3, 1, 0 },
+ { -3, 1, 0 }, { 4, 1, 0 }, { -4, 1, 0 }, { 1, 2, 0 }, { -1, 2, 0 }, { 5, 1, 1 },
+ { -5, 1, 1 }, { 2, 2, 0 }, { -2, 2, 0 }, { 6, 1, 1 }, { -6, 1, 1 }, { 1, 3, 0 },
+ { -1, 3, 0 }, { 7, 1, 1 }, { -7, 1, 1 }, { 3, 2, 0 }, { -3, 2, 0 }, { 8, 1, 1 },
+ { -8, 1, 1 }, { 1, 4, 0 }, { -1, 4, 0 }, { 2, 3, 0 }, { -2, 3, 0 }, { 9, 1, 1 },
+ { -9, 1, 1 }, { 4, 2, 0 }, { -4, 2, 0 }, { 1, 5, 0 }, { -1, 5, 0 }, { 10, 1, 1 },
+ {-10, 1, 1 }, { 3, 3, 0 }, { -3, 3, 0 }, { 5, 2, 1 }, { -5, 2, 1 }, { 2, 4, 0 },
+ { -2, 4, 0 }, { 11, 1, 1 }, {-11, 1, 1 }, { 1, 6, 0 }, { -1, 6, 0 }, { 12, 1, 1 },
+ {-12, 1, 1 }, { 1, 7, 0 }, { -1, 7, 0 }, { 6, 2, 1 }, { -6, 2, 1 }, { 13, 1, 1 },
+ {-13, 1, 1 }, { 2, 5, 0 }, { -2, 5, 0 }, { 1, 8, 0 }, { -1, 8, 0 },
+ },
+ //level_add
+ { 0, 14, 7, 4, 3, 3, 2, 2, 2, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
+ 1, //golomb_order
+ 4, //inc_limit
+ 8 //max_run
+ },
+ {
+ { //level / run
+ { EOB }, { 1, 1, 0 }, { -1, 1, 0 }, { 2, 1, 0 }, { -2, 1, 0 }, { 3, 1, 0 },
+ { -3, 1, 0 }, { 4, 1, 0 }, { -4, 1, 0 }, { 5, 1, 0 }, { -5, 1, 0 }, { 6, 1, 0 },
+ { -6, 1, 0 }, { 7, 1, 0 }, { -7, 1, 0 }, { 8, 1, 0 }, { -8, 1, 0 }, { 1, 2, 0 },
+ { -1, 2, 0 }, { 9, 1, 0 }, { -9, 1, 0 }, { 10, 1, 0 }, { -10, 1, 0 }, { 11, 1, 0 },
+ { -11, 1, 0 }, { 2, 2, 0 }, { -2, 2, 0 }, { 12, 1, 0 }, { -12, 1, 0 }, { 13, 1, 0 },
+ { -13, 1, 0 }, { 3, 2, 0 }, { -3, 2, 0 }, { 14, 1, 0 }, { -14, 1, 0 }, { 1, 3, 0 },
+ { -1, 3, 0 }, { 15, 1, 0 }, { -15, 1, 0 }, { 4, 2, 0 }, { -4, 2, 0 }, { 16, 1, 0 },
+ { -16, 1, 0 }, { 17, 1, 0 }, { -17, 1, 0 }, { 5, 2, 0 }, { -5, 2, 0 }, { 1, 4, 0 },
+ { -1, 4, 0 }, { 2, 3, 0 }, { -2, 3, 0 }, { 18, 1, 0 }, { -18, 1, 0 }, { 6, 2, 0 },
+ { -6, 2, 0 }, { 19, 1, 0 }, { -19, 1, 0 }, { 1, 5, 0 }, { -1, 5, 0 },
+ },
+ //level_add
+ { 0, 20, 7, 3, 2, 2, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1 },
+ 0, //golomb_order
+ INT_MAX, //inc_limit
+ 5, //max_run
+ }
+};
+
+#undef EOB
+
+/*****************************************************************************
+ *
+ * motion vector prediction
+ *
+ ****************************************************************************/
+
+static inline void store_mvs(AVSContext *h)
+{
+ h->col_mv[h->mbidx * 4 + 0] = h->mv[MV_FWD_X0];
+ h->col_mv[h->mbidx * 4 + 1] = h->mv[MV_FWD_X1];
+ h->col_mv[h->mbidx * 4 + 2] = h->mv[MV_FWD_X2];
+ h->col_mv[h->mbidx * 4 + 3] = h->mv[MV_FWD_X3];
+}
+
+static inline void mv_pred_direct(AVSContext *h, cavs_vector *pmv_fw,
+ cavs_vector *col_mv)
+{
+ cavs_vector *pmv_bw = pmv_fw + MV_BWD_OFFS;
+ int den = h->direct_den[col_mv->ref];
+ int m = col_mv->x >> 31;
+
+ pmv_fw->dist = h->dist[1];
+ pmv_bw->dist = h->dist[0];
+ pmv_fw->ref = 1;
+ pmv_bw->ref = 0;
+ /* scale the co-located motion vector according to its temporal span */
+ pmv_fw->x = (((den + (den * col_mv->x * pmv_fw->dist ^ m) - m - 1) >> 14) ^ m) - m;
+ pmv_bw->x = m - (((den + (den * col_mv->x * pmv_bw->dist ^ m) - m - 1) >> 14) ^ m);
+ m = col_mv->y >> 31;
+ pmv_fw->y = (((den + (den * col_mv->y * pmv_fw->dist ^ m) - m - 1) >> 14) ^ m) - m;
+ pmv_bw->y = m - (((den + (den * col_mv->y * pmv_bw->dist ^ m) - m - 1) >> 14) ^ m);
+}
+
+static inline void mv_pred_sym(AVSContext *h, cavs_vector *src,
+ enum cavs_block size)
+{
+ cavs_vector *dst = src + MV_BWD_OFFS;
+
+ /* backward mv is the scaled and negated forward mv */
+ dst->x = -((src->x * h->sym_factor + 256) >> 9);
+ dst->y = -((src->y * h->sym_factor + 256) >> 9);
+ dst->ref = 0;
+ dst->dist = h->dist[0];
+ set_mvs(dst, size);
+}
+
+/*****************************************************************************
+ *
+ * residual data decoding
+ *
+ ****************************************************************************/
+
+/** kth-order exponential golomb code */
+static inline int get_ue_code(GetBitContext *gb, int order)
+{
+ unsigned ret = get_ue_golomb(gb);
+ if (ret >= ((1U<<31)>>order)) {
+ av_log(NULL, AV_LOG_ERROR, "get_ue_code: value too larger\n");
+ return AVERROR_INVALIDDATA;
+ }
+ if (order) {
+ return (ret<<order) + get_bits(gb, order);
+ }
+ return ret;
+}
+
+static inline int dequant(AVSContext *h, int16_t *level_buf, uint8_t *run_buf,
+ int16_t *dst, int mul, int shift, int coeff_num)
+{
+ int round = 1 << (shift - 1);
+ int pos = -1;
+ const uint8_t *scantab = h->scantable.permutated;
+
+ /* inverse scan and dequantization */
+ while (--coeff_num >= 0) {
+ pos += run_buf[coeff_num];
+ if (pos > 63) {
+ av_log(h->avctx, AV_LOG_ERROR,
+ "position out of block bounds at pic %d MB(%d,%d)\n",
+ h->cur.poc, h->mbx, h->mby);
+ return -1;
+ }
+ dst[scantab[pos]] = (level_buf[coeff_num] * mul + round) >> shift;
+ }
+ return 0;
+}
+
+/**
+ * decode coefficients from one 8x8 block, dequantize, inverse transform
+ * and add them to sample block
+ * @param r pointer to 2D VLC table
+ * @param esc_golomb_order escape codes are k-golomb with this order k
+ * @param qp quantizer
+ * @param dst location of sample block
+ * @param stride line stride in frame buffer
+ */
+static int decode_residual_block(AVSContext *h, GetBitContext *gb,
+ const struct dec_2dvlc *r, int esc_golomb_order,
+ int qp, uint8_t *dst, int stride)
+{
+ int i, esc_code, level, mask;
+ unsigned int level_code, run;
+ int16_t level_buf[65];
+ uint8_t run_buf[65];
+ int16_t *block = h->block;
+
+ for (i = 0; i < 65; i++) {
+ level_code = get_ue_code(gb, r->golomb_order);
+ if (level_code >= ESCAPE_CODE) {
+ run = ((level_code - ESCAPE_CODE) >> 1) + 1;
+ if(run > 64)
+ return -1;
+ esc_code = get_ue_code(gb, esc_golomb_order);
+ level = esc_code + (run > r->max_run ? 1 : r->level_add[run]);
+ while (level > r->inc_limit)
+ r++;
+ mask = -(level_code & 1);
+ level = (level ^ mask) - mask;
+ } else {
+ level = r->rltab[level_code][0];
+ if (!level) //end of block signal
+ break;
+ run = r->rltab[level_code][1];
+ r += r->rltab[level_code][2];
+ }
+ level_buf[i] = level;
+ run_buf[i] = run;
+ }
+ if (dequant(h, level_buf, run_buf, block, dequant_mul[qp],
+ dequant_shift[qp], i))
+ return -1;
+ h->cdsp.cavs_idct8_add(dst, block, stride);
+ h->dsp.clear_block(block);
+ return 0;
+}
+
+
+static inline void decode_residual_chroma(AVSContext *h)
+{
+ if (h->cbp & (1 << 4))
+ decode_residual_block(h, &h->gb, chroma_dec, 0,
+ cavs_chroma_qp[h->qp], h->cu, h->c_stride);
+ if (h->cbp & (1 << 5))
+ decode_residual_block(h, &h->gb, chroma_dec, 0,
+ cavs_chroma_qp[h->qp], h->cv, h->c_stride);
+}
+
+static inline int decode_residual_inter(AVSContext *h)
+{
+ int block;
+
+ /* get coded block pattern */
+ int cbp = get_ue_golomb(&h->gb);
+ if (cbp > 63U) {
+ av_log(h->avctx, AV_LOG_ERROR, "illegal inter cbp\n");
+ return -1;
+ }
+ h->cbp = cbp_tab[cbp][1];
+
+ /* get quantizer */
+ if (h->cbp && !h->qp_fixed)
+ h->qp = (h->qp + get_se_golomb(&h->gb)) & 63;
+ for (block = 0; block < 4; block++)
+ if (h->cbp & (1 << block))
+ decode_residual_block(h, &h->gb, inter_dec, 0, h->qp,
+ h->cy + h->luma_scan[block], h->l_stride);
+ decode_residual_chroma(h);
+
+ return 0;
+}
+
+/*****************************************************************************
+ *
+ * macroblock level
+ *
+ ****************************************************************************/
+
+static inline void set_mv_intra(AVSContext *h)
+{
+ h->mv[MV_FWD_X0] = ff_cavs_intra_mv;
+ set_mvs(&h->mv[MV_FWD_X0], BLK_16X16);
+ h->mv[MV_BWD_X0] = ff_cavs_intra_mv;
+ set_mvs(&h->mv[MV_BWD_X0], BLK_16X16);
+ if (h->cur.f->pict_type != AV_PICTURE_TYPE_B)
+ h->col_type_base[h->mbidx] = I_8X8;
+}
+
+static int decode_mb_i(AVSContext *h, int cbp_code)
+{
+ GetBitContext *gb = &h->gb;
+ unsigned pred_mode_uv;
+ int block;
+ uint8_t top[18];
+ uint8_t *left = NULL;
+ uint8_t *d;
+
+ ff_cavs_init_mb(h);
+
+ /* get intra prediction modes from stream */
+ for (block = 0; block < 4; block++) {
+ int nA, nB, predpred;
+ int pos = scan3x3[block];
+
+ nA = h->pred_mode_Y[pos - 1];
+ nB = h->pred_mode_Y[pos - 3];
+ predpred = FFMIN(nA, nB);
+ if (predpred == NOT_AVAIL) // if either is not available
+ predpred = INTRA_L_LP;
+ if (!get_bits1(gb)) {
+ int rem_mode = get_bits(gb, 2);
+ predpred = rem_mode + (rem_mode >= predpred);
+ }
+ h->pred_mode_Y[pos] = predpred;
+ }
+ pred_mode_uv = get_ue_golomb(gb);
+ if (pred_mode_uv > 6) {
+ av_log(h->avctx, AV_LOG_ERROR, "illegal intra chroma pred mode\n");
+ return -1;
+ }
+ ff_cavs_modify_mb_i(h, &pred_mode_uv);
+
+ /* get coded block pattern */
+ if (h->cur.f->pict_type == AV_PICTURE_TYPE_I)
+ cbp_code = get_ue_golomb(gb);
+ if (cbp_code > 63U) {
+ av_log(h->avctx, AV_LOG_ERROR, "illegal intra cbp\n");
+ return -1;
+ }
+ h->cbp = cbp_tab[cbp_code][0];
+ if (h->cbp && !h->qp_fixed)
+ h->qp = (h->qp + get_se_golomb(gb)) & 63; //qp_delta
+
+ /* luma intra prediction interleaved with residual decode/transform/add */
+ for (block = 0; block < 4; block++) {
+ d = h->cy + h->luma_scan[block];
+ ff_cavs_load_intra_pred_luma(h, top, &left, block);
+ h->intra_pred_l[h->pred_mode_Y[scan3x3[block]]]
+ (d, top, left, h->l_stride);
+ if (h->cbp & (1<<block))
+ decode_residual_block(h, gb, intra_dec, 1, h->qp, d, h->l_stride);
+ }
+
+ /* chroma intra prediction */
+ ff_cavs_load_intra_pred_chroma(h);
+ h->intra_pred_c[pred_mode_uv](h->cu, &h->top_border_u[h->mbx * 10],
+ h->left_border_u, h->c_stride);
+ h->intra_pred_c[pred_mode_uv](h->cv, &h->top_border_v[h->mbx * 10],
+ h->left_border_v, h->c_stride);
+
+ decode_residual_chroma(h);
+ ff_cavs_filter(h, I_8X8);
+ set_mv_intra(h);
+ return 0;
+}
+
+static inline void set_intra_mode_default(AVSContext *h)
+{
+ if (h->stream_revision > 0) {
+ h->pred_mode_Y[3] = h->pred_mode_Y[6] = NOT_AVAIL;
+ h->top_pred_Y[h->mbx * 2 + 0] = h->top_pred_Y[h->mbx * 2 + 1] = NOT_AVAIL;
+ } else {
+ h->pred_mode_Y[3] = h->pred_mode_Y[6] = INTRA_L_LP;
+ h->top_pred_Y[h->mbx * 2 + 0] = h->top_pred_Y[h->mbx * 2 + 1] = INTRA_L_LP;
+ }
+}
+
+static void decode_mb_p(AVSContext *h, enum cavs_mb mb_type)
+{
+ GetBitContext *gb = &h->gb;
+ int ref[4];
+
+ ff_cavs_init_mb(h);
+ switch (mb_type) {
+ case P_SKIP:
+ ff_cavs_mv(h, MV_FWD_X0, MV_FWD_C2, MV_PRED_PSKIP, BLK_16X16, 0);
+ break;
+ case P_16X16:
+ ref[0] = h->ref_flag ? 0 : get_bits1(gb);
+ ff_cavs_mv(h, MV_FWD_X0, MV_FWD_C2, MV_PRED_MEDIAN, BLK_16X16, ref[0]);
+ break;
+ case P_16X8:
+ ref[0] = h->ref_flag ? 0 : get_bits1(gb);
+ ref[2] = h->ref_flag ? 0 : get_bits1(gb);
+ ff_cavs_mv(h, MV_FWD_X0, MV_FWD_C2, MV_PRED_TOP, BLK_16X8, ref[0]);
+ ff_cavs_mv(h, MV_FWD_X2, MV_FWD_A1, MV_PRED_LEFT, BLK_16X8, ref[2]);
+ break;
+ case P_8X16:
+ ref[0] = h->ref_flag ? 0 : get_bits1(gb);
+ ref[1] = h->ref_flag ? 0 : get_bits1(gb);
+ ff_cavs_mv(h, MV_FWD_X0, MV_FWD_B3, MV_PRED_LEFT, BLK_8X16, ref[0]);
+ ff_cavs_mv(h, MV_FWD_X1, MV_FWD_C2, MV_PRED_TOPRIGHT, BLK_8X16, ref[1]);
+ break;
+ case P_8X8:
+ ref[0] = h->ref_flag ? 0 : get_bits1(gb);
+ ref[1] = h->ref_flag ? 0 : get_bits1(gb);
+ ref[2] = h->ref_flag ? 0 : get_bits1(gb);
+ ref[3] = h->ref_flag ? 0 : get_bits1(gb);
+ ff_cavs_mv(h, MV_FWD_X0, MV_FWD_B3, MV_PRED_MEDIAN, BLK_8X8, ref[0]);
+ ff_cavs_mv(h, MV_FWD_X1, MV_FWD_C2, MV_PRED_MEDIAN, BLK_8X8, ref[1]);
+ ff_cavs_mv(h, MV_FWD_X2, MV_FWD_X1, MV_PRED_MEDIAN, BLK_8X8, ref[2]);
+ ff_cavs_mv(h, MV_FWD_X3, MV_FWD_X0, MV_PRED_MEDIAN, BLK_8X8, ref[3]);
+ }
+ ff_cavs_inter(h, mb_type);
+ set_intra_mode_default(h);
+ store_mvs(h);
+ if (mb_type != P_SKIP)
+ decode_residual_inter(h);
+ ff_cavs_filter(h, mb_type);
+ h->col_type_base[h->mbidx] = mb_type;
+}
+
+static int decode_mb_b(AVSContext *h, enum cavs_mb mb_type)
+{
+ int block;
+ enum cavs_sub_mb sub_type[4];
+ int flags;
+
+ ff_cavs_init_mb(h);
+
+ /* reset all MVs */
+ h->mv[MV_FWD_X0] = ff_cavs_dir_mv;
+ set_mvs(&h->mv[MV_FWD_X0], BLK_16X16);
+ h->mv[MV_BWD_X0] = ff_cavs_dir_mv;
+ set_mvs(&h->mv[MV_BWD_X0], BLK_16X16);
+ switch (mb_type) {
+ case B_SKIP:
+ case B_DIRECT:
+ if (!h->col_type_base[h->mbidx]) {
+ /* intra MB at co-location, do in-plane prediction */
+ ff_cavs_mv(h, MV_FWD_X0, MV_FWD_C2, MV_PRED_BSKIP, BLK_16X16, 1);
+ ff_cavs_mv(h, MV_BWD_X0, MV_BWD_C2, MV_PRED_BSKIP, BLK_16X16, 0);
+ } else
+ /* direct prediction from co-located P MB, block-wise */
+ for (block = 0; block < 4; block++)
+ mv_pred_direct(h, &h->mv[mv_scan[block]],
+ &h->col_mv[h->mbidx * 4 + block]);
+ break;
+ case B_FWD_16X16:
+ ff_cavs_mv(h, MV_FWD_X0, MV_FWD_C2, MV_PRED_MEDIAN, BLK_16X16, 1);
+ break;
+ case B_SYM_16X16:
+ ff_cavs_mv(h, MV_FWD_X0, MV_FWD_C2, MV_PRED_MEDIAN, BLK_16X16, 1);
+ mv_pred_sym(h, &h->mv[MV_FWD_X0], BLK_16X16);
+ break;
+ case B_BWD_16X16:
+ ff_cavs_mv(h, MV_BWD_X0, MV_BWD_C2, MV_PRED_MEDIAN, BLK_16X16, 0);
+ break;
+ case B_8X8:
+ for (block = 0; block < 4; block++)
+ sub_type[block] = get_bits(&h->gb, 2);
+ for (block = 0; block < 4; block++) {
+ switch (sub_type[block]) {
+ case B_SUB_DIRECT:
+ if (!h->col_type_base[h->mbidx]) {
+ /* intra MB at co-location, do in-plane prediction */
+ ff_cavs_mv(h, mv_scan[block], mv_scan[block] - 3,
+ MV_PRED_BSKIP, BLK_8X8, 1);
+ ff_cavs_mv(h, mv_scan[block] + MV_BWD_OFFS,
+ mv_scan[block] - 3 + MV_BWD_OFFS,
+ MV_PRED_BSKIP, BLK_8X8, 0);
+ } else
+ mv_pred_direct(h, &h->mv[mv_scan[block]],
+ &h->col_mv[h->mbidx * 4 + block]);
+ break;
+ case B_SUB_FWD:
+ ff_cavs_mv(h, mv_scan[block], mv_scan[block] - 3,
+ MV_PRED_MEDIAN, BLK_8X8, 1);
+ break;
+ case B_SUB_SYM:
+ ff_cavs_mv(h, mv_scan[block], mv_scan[block] - 3,
+ MV_PRED_MEDIAN, BLK_8X8, 1);
+ mv_pred_sym(h, &h->mv[mv_scan[block]], BLK_8X8);
+ break;
+ }
+ }
+ for (block = 0; block < 4; block++) {
+ if (sub_type[block] == B_SUB_BWD)
+ ff_cavs_mv(h, mv_scan[block] + MV_BWD_OFFS,
+ mv_scan[block] + MV_BWD_OFFS - 3,
+ MV_PRED_MEDIAN, BLK_8X8, 0);
+ }
+ break;
+ default:
+ if (mb_type <= B_SYM_16X16) {
+ av_log(h->avctx, AV_LOG_ERROR, "Invalid mb_type %d in B frame\n", mb_type);
+ return AVERROR_INVALIDDATA;
+ }
+ av_assert2(mb_type < B_8X8);
+ flags = ff_cavs_partition_flags[mb_type];
+ if (mb_type & 1) { /* 16x8 macroblock types */
+ if (flags & FWD0)
+ ff_cavs_mv(h, MV_FWD_X0, MV_FWD_C2, MV_PRED_TOP, BLK_16X8, 1);
+ if (flags & SYM0)
+ mv_pred_sym(h, &h->mv[MV_FWD_X0], BLK_16X8);
+ if (flags & FWD1)
+ ff_cavs_mv(h, MV_FWD_X2, MV_FWD_A1, MV_PRED_LEFT, BLK_16X8, 1);
+ if (flags & SYM1)
+ mv_pred_sym(h, &h->mv[MV_FWD_X2], BLK_16X8);
+ if (flags & BWD0)
+ ff_cavs_mv(h, MV_BWD_X0, MV_BWD_C2, MV_PRED_TOP, BLK_16X8, 0);
+ if (flags & BWD1)
+ ff_cavs_mv(h, MV_BWD_X2, MV_BWD_A1, MV_PRED_LEFT, BLK_16X8, 0);
+ } else { /* 8x16 macroblock types */
+ if (flags & FWD0)
+ ff_cavs_mv(h, MV_FWD_X0, MV_FWD_B3, MV_PRED_LEFT, BLK_8X16, 1);
+ if (flags & SYM0)
+ mv_pred_sym(h, &h->mv[MV_FWD_X0], BLK_8X16);
+ if (flags & FWD1)
+ ff_cavs_mv(h, MV_FWD_X1, MV_FWD_C2, MV_PRED_TOPRIGHT, BLK_8X16, 1);
+ if (flags & SYM1)
+ mv_pred_sym(h, &h->mv[MV_FWD_X1], BLK_8X16);
+ if (flags & BWD0)
+ ff_cavs_mv(h, MV_BWD_X0, MV_BWD_B3, MV_PRED_LEFT, BLK_8X16, 0);
+ if (flags & BWD1)
+ ff_cavs_mv(h, MV_BWD_X1, MV_BWD_C2, MV_PRED_TOPRIGHT, BLK_8X16, 0);
+ }
+ }
+ ff_cavs_inter(h, mb_type);
+ set_intra_mode_default(h);
+ if (mb_type != B_SKIP)
+ decode_residual_inter(h);
+ ff_cavs_filter(h, mb_type);
+
+ return 0;
+}
+
+/*****************************************************************************
+ *
+ * slice level
+ *
+ ****************************************************************************/
+
+static inline int decode_slice_header(AVSContext *h, GetBitContext *gb)
+{
+ if (h->stc > 0xAF)
+ av_log(h->avctx, AV_LOG_ERROR, "unexpected start code 0x%02x\n", h->stc);
+
+ if (h->stc >= h->mb_height)
+ return -1;
+
+ h->mby = h->stc;
+ h->mbidx = h->mby * h->mb_width;
+
+ /* mark top macroblocks as unavailable */
+ h->flags &= ~(B_AVAIL | C_AVAIL);
+ if ((h->mby == 0) && (!h->qp_fixed)) {
+ h->qp_fixed = get_bits1(gb);
+ h->qp = get_bits(gb, 6);
+ }
+ /* inter frame or second slice can have weighting params */
+ if ((h->cur.f->pict_type != AV_PICTURE_TYPE_I) ||
+ (!h->pic_structure && h->mby >= h->mb_width / 2))
+ if (get_bits1(gb)) { //slice_weighting_flag
+ av_log(h->avctx, AV_LOG_ERROR,
+ "weighted prediction not yet supported\n");
+ }
+ return 0;
+}
+
+static inline int check_for_slice(AVSContext *h)
+{
+ GetBitContext *gb = &h->gb;
+ int align;
+
+ if (h->mbx)
+ return 0;
+ align = (-get_bits_count(gb)) & 7;
+ /* check for stuffing byte */
+ if (!align && (show_bits(gb, 8) == 0x80))
+ align = 8;
+ if ((show_bits_long(gb, 24 + align) & 0xFFFFFF) == 0x000001) {
+ skip_bits_long(gb, 24 + align);
+ h->stc = get_bits(gb, 8);
+ if (h->stc >= h->mb_height)
+ return 0;
+ decode_slice_header(h, gb);
+ return 1;
+ }
+ return 0;
+}
+
+/*****************************************************************************
+ *
+ * frame level
+ *
+ ****************************************************************************/
+
+static int decode_pic(AVSContext *h)
+{
+ int skip_count = -1;
+ int ret;
+ enum cavs_mb mb_type;
+
+ av_frame_unref(h->cur.f);
+
+ skip_bits(&h->gb, 16);//bbv_dwlay
+ if (h->stc == PIC_PB_START_CODE) {
+ h->cur.f->pict_type = get_bits(&h->gb, 2) + AV_PICTURE_TYPE_I;
+ if (h->cur.f->pict_type > AV_PICTURE_TYPE_B) {
+ av_log(h->avctx, AV_LOG_ERROR, "illegal picture type\n");
+ return -1;
+ }
+ /* make sure we have the reference frames we need */
+ if (!h->DPB[0].f->data[0] ||
+ (!h->DPB[1].f->data[0] && h->cur.f->pict_type == AV_PICTURE_TYPE_B))
+ return -1;
+ } else {
+ h->cur.f->pict_type = AV_PICTURE_TYPE_I;
+ if (get_bits1(&h->gb))
+ skip_bits(&h->gb, 24);//time_code
+ /* old sample clips were all progressive and no low_delay,
+ bump stream revision if detected otherwise */
+ if (h->low_delay || !(show_bits(&h->gb, 9) & 1))
+ h->stream_revision = 1;
+ /* similarly test top_field_first and repeat_first_field */
+ else if (show_bits(&h->gb, 11) & 3)
+ h->stream_revision = 1;
+ if (h->stream_revision > 0)
+ skip_bits(&h->gb, 1); //marker_bit
+ }
+
+ if ((ret = ff_get_buffer(h->avctx, h->cur.f,
+ h->cur.f->pict_type == AV_PICTURE_TYPE_B ?
+ 0 : AV_GET_BUFFER_FLAG_REF)) < 0)
+ return ret;
+
+ if (!h->edge_emu_buffer) {
+ int alloc_size = FFALIGN(FFABS(h->cur.f->linesize[0]) + 32, 32);
+ h->edge_emu_buffer = av_mallocz(alloc_size * 2 * 24);
+ if (!h->edge_emu_buffer)
+ return AVERROR(ENOMEM);
+ }
+
+ if ((ret = ff_cavs_init_pic(h)) < 0)
+ return ret;
+ h->cur.poc = get_bits(&h->gb, 8) * 2;
+
+ /* get temporal distances and MV scaling factors */
+ if (h->cur.f->pict_type != AV_PICTURE_TYPE_B) {
+ h->dist[0] = (h->cur.poc - h->DPB[0].poc + 512) % 512;
+ } else {
+ h->dist[0] = (h->DPB[0].poc - h->cur.poc + 512) % 512;
+ }
+ h->dist[1] = (h->cur.poc - h->DPB[1].poc + 512) % 512;
+ h->scale_den[0] = h->dist[0] ? 512/h->dist[0] : 0;
+ h->scale_den[1] = h->dist[1] ? 512/h->dist[1] : 0;
+ if (h->cur.f->pict_type == AV_PICTURE_TYPE_B) {
+ h->sym_factor = h->dist[0] * h->scale_den[1];
+ } else {
+ h->direct_den[0] = h->dist[0] ? 16384 / h->dist[0] : 0;
+ h->direct_den[1] = h->dist[1] ? 16384 / h->dist[1] : 0;
+ }
+
+ if (h->low_delay)
+ get_ue_golomb(&h->gb); //bbv_check_times
+ h->progressive = get_bits1(&h->gb);
+ h->pic_structure = 1;
+ if (!h->progressive)
+ h->pic_structure = get_bits1(&h->gb);
+ if (!h->pic_structure && h->stc == PIC_PB_START_CODE)
+ skip_bits1(&h->gb); //advanced_pred_mode_disable
+ skip_bits1(&h->gb); //top_field_first
+ skip_bits1(&h->gb); //repeat_first_field
+ h->qp_fixed = get_bits1(&h->gb);
+ h->qp = get_bits(&h->gb, 6);
+ if (h->cur.f->pict_type == AV_PICTURE_TYPE_I) {
+ if (!h->progressive && !h->pic_structure)
+ skip_bits1(&h->gb);//what is this?
+ skip_bits(&h->gb, 4); //reserved bits
+ } else {
+ if (!(h->cur.f->pict_type == AV_PICTURE_TYPE_B && h->pic_structure == 1))
+ h->ref_flag = get_bits1(&h->gb);
+ skip_bits(&h->gb, 4); //reserved bits
+ h->skip_mode_flag = get_bits1(&h->gb);
+ }
+ h->loop_filter_disable = get_bits1(&h->gb);
+ if (!h->loop_filter_disable && get_bits1(&h->gb)) {
+ h->alpha_offset = get_se_golomb(&h->gb);
+ h->beta_offset = get_se_golomb(&h->gb);
+ } else {
+ h->alpha_offset = h->beta_offset = 0;
+ }
+ if (h->cur.f->pict_type == AV_PICTURE_TYPE_I) {
+ do {
+ check_for_slice(h);
+ decode_mb_i(h, 0);
+ } while (ff_cavs_next_mb(h));
+ } else if (h->cur.f->pict_type == AV_PICTURE_TYPE_P) {
+ do {
+ if (check_for_slice(h))
+ skip_count = -1;
+ if (h->skip_mode_flag && (skip_count < 0))
+ skip_count = get_ue_golomb(&h->gb);
+ if (h->skip_mode_flag && skip_count--) {
+ decode_mb_p(h, P_SKIP);
+ } else {
+ mb_type = get_ue_golomb(&h->gb) + P_SKIP + h->skip_mode_flag;
+ if (mb_type > P_8X8)
+ decode_mb_i(h, mb_type - P_8X8 - 1);
+ else
+ decode_mb_p(h, mb_type);
+ }
+ } while (ff_cavs_next_mb(h));
+ } else { /* AV_PICTURE_TYPE_B */
+ do {
+ if (check_for_slice(h))
+ skip_count = -1;
+ if (h->skip_mode_flag && (skip_count < 0))
+ skip_count = get_ue_golomb(&h->gb);
+ if (h->skip_mode_flag && skip_count--) {
+ decode_mb_b(h, B_SKIP);
+ } else {
+ mb_type = get_ue_golomb(&h->gb) + B_SKIP + h->skip_mode_flag;
+ if (mb_type > B_8X8)
+ decode_mb_i(h, mb_type - B_8X8 - 1);
+ else
+ decode_mb_b(h, mb_type);
+ }
+ } while (ff_cavs_next_mb(h));
+ }
+ if (h->cur.f->pict_type != AV_PICTURE_TYPE_B) {
+ av_frame_unref(h->DPB[1].f);
+ FFSWAP(AVSFrame, h->cur, h->DPB[1]);
+ FFSWAP(AVSFrame, h->DPB[0], h->DPB[1]);
+ }
+ return 0;
+}
+
+/*****************************************************************************
+ *
+ * headers and interface
+ *
+ ****************************************************************************/
+
+static int decode_seq_header(AVSContext *h)
+{
+ int frame_rate_code;
+ int width, height;
+
+ h->profile = get_bits(&h->gb, 8);
+ h->level = get_bits(&h->gb, 8);
+ skip_bits1(&h->gb); //progressive sequence
+
+ width = get_bits(&h->gb, 14);
+ height = get_bits(&h->gb, 14);
+ if ((h->width || h->height) && (h->width != width || h->height != height)) {
+ avpriv_report_missing_feature(h->avctx,
+ "Width/height changing in CAVS");
+ return AVERROR_PATCHWELCOME;
+ }
+ if (width <= 0 || height <= 0) {
+ av_log(h->avctx, AV_LOG_ERROR, "Dimensions invalid\n");
+ return AVERROR_INVALIDDATA;
+ }
+ h->width = width;
+ h->height = height;
+
+ skip_bits(&h->gb, 2); //chroma format
+ skip_bits(&h->gb, 3); //sample_precision
+ h->aspect_ratio = get_bits(&h->gb, 4);
+ frame_rate_code = get_bits(&h->gb, 4);
+ skip_bits(&h->gb, 18); //bit_rate_lower
+ skip_bits1(&h->gb); //marker_bit
+ skip_bits(&h->gb, 12); //bit_rate_upper
+ h->low_delay = get_bits1(&h->gb);
+ h->mb_width = (h->width + 15) >> 4;
+ h->mb_height = (h->height + 15) >> 4;
+ h->avctx->time_base.den = ff_mpeg12_frame_rate_tab[frame_rate_code].num;
+ h->avctx->time_base.num = ff_mpeg12_frame_rate_tab[frame_rate_code].den;
+ h->avctx->width = h->width;
+ h->avctx->height = h->height;
+ if (!h->top_qp)
+ ff_cavs_init_top_lines(h);
+ return 0;
+}
+
+static void cavs_flush(AVCodecContext * avctx)
+{
+ AVSContext *h = avctx->priv_data;
+ h->got_keyframe = 0;
+}
+
+static int cavs_decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
+ AVPacket *avpkt)
+{
+ AVSContext *h = avctx->priv_data;
+ const uint8_t *buf = avpkt->data;
+ int buf_size = avpkt->size;
+ uint32_t stc = -1;
+ int input_size, ret;
+ const uint8_t *buf_end;
+ const uint8_t *buf_ptr;
+
+ if (buf_size == 0) {
+ if (!h->low_delay && h->DPB[0].f->data[0]) {
+ *got_frame = 1;
+ av_frame_move_ref(data, h->DPB[0].f);
+ }
+ return 0;
+ }
+
+ buf_ptr = buf;
+ buf_end = buf + buf_size;
+ for(;;) {
+ buf_ptr = avpriv_mpv_find_start_code(buf_ptr, buf_end, &stc);
+ if ((stc & 0xFFFFFE00) || buf_ptr == buf_end)
+ return FFMAX(0, buf_ptr - buf);
+ input_size = (buf_end - buf_ptr) * 8;
+ switch (stc) {
+ case CAVS_START_CODE:
+ init_get_bits(&h->gb, buf_ptr, input_size);
+ decode_seq_header(h);
+ break;
+ case PIC_I_START_CODE:
+ if (!h->got_keyframe) {
+ av_frame_unref(h->DPB[0].f);
+ av_frame_unref(h->DPB[1].f);
+ h->got_keyframe = 1;
+ }
+ case PIC_PB_START_CODE:
+ *got_frame = 0;
+ if (!h->got_keyframe)
+ break;
+ if(!h->top_qp)
+ break;
+ init_get_bits(&h->gb, buf_ptr, input_size);
+ h->stc = stc;
+ if (decode_pic(h))
+ break;
+ *got_frame = 1;
+ if (h->cur.f->pict_type != AV_PICTURE_TYPE_B) {
+ if (h->DPB[1].f->data[0]) {
+ if ((ret = av_frame_ref(data, h->DPB[1].f)) < 0)
+ return ret;
+ } else {
+ *got_frame = 0;
+ }
+ } else {
+ av_frame_move_ref(data, h->cur.f);
+ }
+ break;
+ case EXT_START_CODE:
+ //mpeg_decode_extension(avctx, buf_ptr, input_size);
+ break;
+ case USER_START_CODE:
+ //mpeg_decode_user_data(avctx, buf_ptr, input_size);
+ break;
+ default:
+ if (stc <= SLICE_MAX_START_CODE) {
+ init_get_bits(&h->gb, buf_ptr, input_size);
+ decode_slice_header(h, &h->gb);
+ }
+ break;
+ }
+ }
+}
+
+AVCodec ff_cavs_decoder = {
+ .name = "cavs",
+ .type = AVMEDIA_TYPE_VIDEO,
+ .id = AV_CODEC_ID_CAVS,
+ .priv_data_size = sizeof(AVSContext),
+ .init = ff_cavs_init,
+ .close = ff_cavs_end,
+ .decode = cavs_decode_frame,
+ .capabilities = CODEC_CAP_DR1 | CODEC_CAP_DELAY,
+ .flush = cavs_flush,
+ .long_name = NULL_IF_CONFIG_SMALL("Chinese AVS (Audio Video Standard) (AVS1-P2, JiZhun profile)"),
+};
generated by cgit v1.2.3 (git 2.39.1) at 2025-12-06 23:02:37 +0000