WebSVN – Kolibri OS – Blame – /contrib/sdk/sources/ffmpeg/libavcodec/cavsdec.c

Rev	Author	Line No.	Line
4349	Serge	1	/*
		2	* Chinese AVS video (AVS1-P2, JiZhun profile) decoder.
		3	* Copyright (c) 2006 Stefan Gehrer
		4	*
		5	* This file is part of FFmpeg.
		6	*
		7	* FFmpeg is free software; you can redistribute it and/or
		8	* modify it under the terms of the GNU Lesser General Public
		9	* License as published by the Free Software Foundation; either
		10	* version 2.1 of the License, or (at your option) any later version.
		11	*
		12	* FFmpeg is distributed in the hope that it will be useful,
		13	* but WITHOUT ANY WARRANTY; without even the implied warranty of
		14	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
		15	* Lesser General Public License for more details.
		16	*
		17	* You should have received a copy of the GNU Lesser General Public
		18	* License along with FFmpeg; if not, write to the Free Software
		19	* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
		20	*/
		21
		22	/**
		23	* @file
		24	* Chinese AVS video (AVS1-P2, JiZhun profile) decoder
		25	* @author Stefan Gehrer
		26	*/
		27
		28	#include "libavutil/avassert.h"
		29	#include "avcodec.h"
		30	#include "get_bits.h"
		31	#include "golomb.h"
		32	#include "cavs.h"
		33	#include "internal.h"
		34	#include "mpeg12data.h"
		35	#include "mpegvideo.h"
		36
		37	static const uint8_t mv_scan[4] = {
		38	MV_FWD_X0, MV_FWD_X1,
		39	MV_FWD_X2, MV_FWD_X3
		40	};
		41
		42	static const uint8_t cbp_tab[64][2] = {
		43	{ 63, 0 }, { 15, 15 }, { 31, 63 }, { 47, 31 }, { 0, 16 }, { 14, 32 }, { 13, 47 }, { 11, 13 },
		44	{ 7, 14 }, { 5, 11 }, { 10, 12 }, { 8, 5 }, { 12, 10 }, { 61, 7 }, { 4, 48 }, { 55, 3 },
		45	{ 1, 2 }, { 2, 8 }, { 59, 4 }, { 3, 1 }, { 62, 61 }, { 9, 55 }, { 6, 59 }, { 29, 62 },
		46	{ 45, 29 }, { 51, 27 }, { 23, 23 }, { 39, 19 }, { 27, 30 }, { 46, 28 }, { 53, 9 }, { 30, 6 },
		47	{ 43, 60 }, { 37, 21 }, { 60, 44 }, { 16, 26 }, { 21, 51 }, { 28, 35 }, { 19, 18 }, { 35, 20 },
		48	{ 42, 24 }, { 26, 53 }, { 44, 17 }, { 32, 37 }, { 58, 39 }, { 24, 45 }, { 20, 58 }, { 17, 43 },
		49	{ 18, 42 }, { 48, 46 }, { 22, 36 }, { 33, 33 }, { 25, 34 }, { 49, 40 }, { 40, 52 }, { 36, 49 },
		50	{ 34, 50 }, { 50, 56 }, { 52, 25 }, { 54, 22 }, { 41, 54 }, { 56, 57 }, { 38, 41 }, { 57, 38 }
		51	};
		52
		53	static const uint8_t scan3x3[4] = { 4, 5, 7, 8 };
		54
		55	static const uint8_t cavs_chroma_qp[64] = {
		56	0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15,
		57	16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31,
		58	32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 42, 43, 43, 44, 44,
		59	45, 45, 46, 46, 47, 47, 48, 48, 48, 49, 49, 49, 50, 50, 50, 51
		60	};
		61
		62	static const uint8_t dequant_shift[64] = {
		63	14, 14, 14, 14, 14, 14, 14, 14,
		64	13, 13, 13, 13, 13, 13, 13, 13,
		65	13, 12, 12, 12, 12, 12, 12, 12,
		66	11, 11, 11, 11, 11, 11, 11, 11,
		67	11, 10, 10, 10, 10, 10, 10, 10,
		68	10, 9, 9, 9, 9, 9, 9, 9,
		69	9, 8, 8, 8, 8, 8, 8, 8,
		70	7, 7, 7, 7, 7, 7, 7, 7
		71	};
		72
		73	static const uint16_t dequant_mul[64] = {
		74	32768, 36061, 38968, 42495, 46341, 50535, 55437, 60424,
		75	32932, 35734, 38968, 42495, 46177, 50535, 55109, 59933,
		76	65535, 35734, 38968, 42577, 46341, 50617, 55027, 60097,
		77	32809, 35734, 38968, 42454, 46382, 50576, 55109, 60056,
		78	65535, 35734, 38968, 42495, 46320, 50515, 55109, 60076,
		79	65535, 35744, 38968, 42495, 46341, 50535, 55099, 60087,
		80	65535, 35734, 38973, 42500, 46341, 50535, 55109, 60097,
		81	32771, 35734, 38965, 42497, 46341, 50535, 55109, 60099
		82	};
		83
		84	#define EOB 0, 0, 0
		85
		86	static const struct dec_2dvlc intra_dec[7] = {
		87	{
		88	{ //level / run / table_inc
		89	{ 1, 1, 1 }, { -1, 1, 1 }, { 1, 2, 1 }, { -1, 2, 1 }, { 1, 3, 1 }, { -1, 3, 1 },
		90	{ 1, 4, 1 }, { -1, 4, 1 }, { 1, 5, 1 }, { -1, 5, 1 }, { 1, 6, 1 }, { -1, 6, 1 },
		91	{ 1, 7, 1 }, { -1, 7, 1 }, { 1, 8, 1 }, { -1, 8, 1 }, { 1, 9, 1 }, { -1, 9, 1 },
		92	{ 1, 10, 1 }, { -1, 10, 1 }, { 1, 11, 1 }, { -1, 11, 1 }, { 2, 1, 2 }, { -2, 1, 2 },
		93	{ 1, 12, 1 }, { -1, 12, 1 }, { 1, 13, 1 }, { -1, 13, 1 }, { 1, 14, 1 }, { -1, 14, 1 },
		94	{ 1, 15, 1 }, { -1, 15, 1 }, { 2, 2, 2 }, { -2, 2, 2 }, { 1, 16, 1 }, { -1, 16, 1 },
		95	{ 1, 17, 1 }, { -1, 17, 1 }, { 3, 1, 3 }, { -3, 1, 3 }, { 1, 18, 1 }, { -1, 18, 1 },
		96	{ 1, 19, 1 }, { -1, 19, 1 }, { 2, 3, 2 }, { -2, 3, 2 }, { 1, 20, 1 }, { -1, 20, 1 },
		97	{ 1, 21, 1 }, { -1, 21, 1 }, { 2, 4, 2 }, { -2, 4, 2 }, { 1, 22, 1 }, { -1, 22, 1 },
		98	{ 2, 5, 2 }, { -2, 5, 2 }, { 1, 23, 1 }, { -1, 23, 1 }, { EOB }
		99	},
		100	//level_add
		101	{ 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 },
		102	2, //golomb_order
		103	0, //inc_limit
		104	23, //max_run
		105	},
		106	{
		107	{ //level / run
		108	{ 1, 1, 0 }, { -1, 1, 0 }, { 1, 2, 0 }, { -1, 2, 0 }, { 2, 1, 1 }, { -2, 1, 1 },
		109	{ 1, 3, 0 }, { -1, 3, 0 }, { EOB }, { 1, 4, 0 }, { -1, 4, 0 }, { 1, 5, 0 },
		110	{ -1, 5, 0 }, { 1, 6, 0 }, { -1, 6, 0 }, { 3, 1, 2 }, { -3, 1, 2 }, { 2, 2, 1 },
		111	{ -2, 2, 1 }, { 1, 7, 0 }, { -1, 7, 0 }, { 1, 8, 0 }, { -1, 8, 0 }, { 1, 9, 0 },
		112	{ -1, 9, 0 }, { 2, 3, 1 }, { -2, 3, 1 }, { 4, 1, 2 }, { -4, 1, 2 }, { 1, 10, 0 },
		113	{ -1, 10, 0 }, { 1, 11, 0 }, { -1, 11, 0 }, { 2, 4, 1 }, { -2, 4, 1 }, { 3, 2, 2 },
		114	{ -3, 2, 2 }, { 1, 12, 0 }, { -1, 12, 0 }, { 2, 5, 1 }, { -2, 5, 1 }, { 5, 1, 3 },
		115	{ -5, 1, 3 }, { 1, 13, 0 }, { -1, 13, 0 }, { 2, 6, 1 }, { -2, 6, 1 }, { 1, 14, 0 },
		116	{ -1, 14, 0 }, { 2, 7, 1 }, { -2, 7, 1 }, { 2, 8, 1 }, { -2, 8, 1 }, { 3, 3, 2 },
		117	{ -3, 3, 2 }, { 6, 1, 3 }, { -6, 1, 3 }, { 1, 15, 0 }, { -1, 15, 0 }
		118	},
		119	//level_add
		120	{ 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 },
		121	2, //golomb_order
		122	1, //inc_limit
		123	15, //max_run
		124	},
		125	{
		126	{ //level / run
		127	{ 1, 1, 0 }, { -1, 1, 0 }, { 2, 1, 0 }, { -2, 1, 0 }, { 1, 2, 0 }, { -1, 2, 0 },
		128	{ 3, 1, 1 }, { -3, 1, 1 }, { EOB }, { 1, 3, 0 }, { -1, 3, 0 }, { 2, 2, 0 },
		129	{ -2, 2, 0 }, { 4, 1, 1 }, { -4, 1, 1 }, { 1, 4, 0 }, { -1, 4, 0 }, { 5, 1, 2 },
		130	{ -5, 1, 2 }, { 1, 5, 0 }, { -1, 5, 0 }, { 3, 2, 1 }, { -3, 2, 1 }, { 2, 3, 0 },
		131	{ -2, 3, 0 }, { 1, 6, 0 }, { -1, 6, 0 }, { 6, 1, 2 }, { -6, 1, 2 }, { 2, 4, 0 },
		132	{ -2, 4, 0 }, { 1, 7, 0 }, { -1, 7, 0 }, { 4, 2, 1 }, { -4, 2, 1 }, { 7, 1, 2 },
		133	{ -7, 1, 2 }, { 3, 3, 1 }, { -3, 3, 1 }, { 2, 5, 0 }, { -2, 5, 0 }, { 1, 8, 0 },
		134	{ -1, 8, 0 }, { 2, 6, 0 }, { -2, 6, 0 }, { 8, 1, 3 }, { -8, 1, 3 }, { 1, 9, 0 },
		135	{ -1, 9, 0 }, { 5, 2, 2 }, { -5, 2, 2 }, { 3, 4, 1 }, { -3, 4, 1 }, { 2, 7, 0 },
		136	{ -2, 7, 0 }, { 9, 1, 3 }, { -9, 1, 3 }, { 1, 10, 0 }, { -1, 10, 0 }
		137	},
		138	//level_add
		139	{ 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 },
		140	2, //golomb_order
		141	2, //inc_limit
		142	10, //max_run
		143	},
		144	{
		145	{ //level / run
		146	{ 1, 1, 0 }, { -1, 1, 0 }, { 2, 1, 0 }, { -2, 1, 0 }, { 3, 1, 0 }, { -3, 1, 0 },
		147	{ 1, 2, 0 }, { -1, 2, 0 }, { EOB }, { 4, 1, 0 }, { -4, 1, 0 }, { 5, 1, 1 },
		148	{ -5, 1, 1 }, { 2, 2, 0 }, { -2, 2, 0 }, { 1, 3, 0 }, { -1, 3, 0 }, { 6, 1, 1 },
		149	{ -6, 1, 1 }, { 3, 2, 0 }, { -3, 2, 0 }, { 7, 1, 1 }, { -7, 1, 1 }, { 1, 4, 0 },
		150	{ -1, 4, 0 }, { 8, 1, 2 }, { -8, 1, 2 }, { 2, 3, 0 }, { -2, 3, 0 }, { 4, 2, 0 },
		151	{ -4, 2, 0 }, { 1, 5, 0 }, { -1, 5, 0 }, { 9, 1, 2 }, { -9, 1, 2 }, { 5, 2, 1 },
		152	{ -5, 2, 1 }, { 2, 4, 0 }, { -2, 4, 0 }, { 10, 1, 2 }, {-10, 1, 2 }, { 3, 3, 0 },
		153	{ -3, 3, 0 }, { 1, 6, 0 }, { -1, 6, 0 }, { 11, 1, 3 }, {-11, 1, 3 }, { 6, 2, 1 },
		154	{ -6, 2, 1 }, { 1, 7, 0 }, { -1, 7, 0 }, { 2, 5, 0 }, { -2, 5, 0 }, { 3, 4, 0 },
		155	{ -3, 4, 0 }, { 12, 1, 3 }, {-12, 1, 3 }, { 4, 3, 0 }, { -4, 3, 0 }
		156	},
		157	//level_add
		158	{ 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 },
		159	2, //golomb_order
		160	4, //inc_limit
		161	7, //max_run
		162	},
		163	{
		164	{ //level / run
		165	{ 1, 1, 0 }, { -1, 1, 0 }, { 2, 1, 0 }, { -2, 1, 0 }, { 3, 1, 0 }, { -3, 1, 0 },
		166	{ EOB }, { 4, 1, 0 }, { -4, 1, 0 }, { 5, 1, 0 }, { -5, 1, 0 }, { 6, 1, 0 },
		167	{ -6, 1, 0 }, { 1, 2, 0 }, { -1, 2, 0 }, { 7, 1, 0 }, { -7, 1, 0 }, { 8, 1, 1 },
		168	{ -8, 1, 1 }, { 2, 2, 0 }, { -2, 2, 0 }, { 9, 1, 1 }, { -9, 1, 1 }, { 10, 1, 1 },
		169	{-10, 1, 1 }, { 1, 3, 0 }, { -1, 3, 0 }, { 3, 2, 0 }, { -3, 2, 0 }, { 11, 1, 2 },
		170	{-11, 1, 2 }, { 4, 2, 0 }, { -4, 2, 0 }, { 12, 1, 2 }, {-12, 1, 2 }, { 13, 1, 2 },
		171	{-13, 1, 2 }, { 5, 2, 0 }, { -5, 2, 0 }, { 1, 4, 0 }, { -1, 4, 0 }, { 2, 3, 0 },
		172	{ -2, 3, 0 }, { 14, 1, 2 }, {-14, 1, 2 }, { 6, 2, 0 }, { -6, 2, 0 }, { 15, 1, 2 },
		173	{-15, 1, 2 }, { 16, 1, 2 }, {-16, 1, 2 }, { 3, 3, 0 }, { -3, 3, 0 }, { 1, 5, 0 },
		174	{ -1, 5, 0 }, { 7, 2, 0 }, { -7, 2, 0 }, { 17, 1, 2 }, {-17, 1, 2 }
		175	},
		176	//level_add
		177	{ 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 },
		178	2, //golomb_order
		179	7, //inc_limit
		180	5, //max_run
		181	},
		182	{
		183	{ //level / run
		184	{ EOB }, { 1, 1, 0 }, { -1, 1, 0 }, { 2, 1, 0 }, { -2, 1, 0 }, { 3, 1, 0 },
		185	{ -3, 1, 0 }, { 4, 1, 0 }, { -4, 1, 0 }, { 5, 1, 0 }, { -5, 1, 0 }, { 6, 1, 0 },
		186	{ -6, 1, 0 }, { 7, 1, 0 }, { -7, 1, 0 }, { 8, 1, 0 }, { -8, 1, 0 }, { 9, 1, 0 },
		187	{ -9, 1, 0 }, { 10, 1, 0 }, {-10, 1, 0 }, { 1, 2, 0 }, { -1, 2, 0 }, { 11, 1, 1 },
		188	{-11, 1, 1 }, { 12, 1, 1 }, {-12, 1, 1 }, { 13, 1, 1 }, {-13, 1, 1 }, { 2, 2, 0 },
		189	{ -2, 2, 0 }, { 14, 1, 1 }, {-14, 1, 1 }, { 15, 1, 1 }, {-15, 1, 1 }, { 3, 2, 0 },
		190	{ -3, 2, 0 }, { 16, 1, 1 }, {-16, 1, 1 }, { 1, 3, 0 }, { -1, 3, 0 }, { 17, 1, 1 },
		191	{-17, 1, 1 }, { 4, 2, 0 }, { -4, 2, 0 }, { 18, 1, 1 }, {-18, 1, 1 }, { 5, 2, 0 },
		192	{ -5, 2, 0 }, { 19, 1, 1 }, {-19, 1, 1 }, { 20, 1, 1 }, {-20, 1, 1 }, { 6, 2, 0 },
		193	{ -6, 2, 0 }, { 21, 1, 1 }, {-21, 1, 1 }, { 2, 3, 0 }, { -2, 3, 0 }
		194	},
		195	//level_add
		196	{ 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 },
		197	2, //golomb_order
		198	10, //inc_limit
		199	3, //max_run
		200	},
		201	{
		202	{ //level / run
		203	{ EOB }, { 1, 1, 0 }, { -1, 1, 0 }, { 2, 1, 0 }, { -2, 1, 0 }, { 3, 1, 0 },
		204	{ -3, 1, 0 }, { 4, 1, 0 }, { -4, 1, 0 }, { 5, 1, 0 }, { -5, 1, 0 }, { 6, 1, 0 },
		205	{ -6, 1, 0 }, { 7, 1, 0 }, { -7, 1, 0 }, { 8, 1, 0 }, { -8, 1, 0 }, { 9, 1, 0 },
		206	{ -9, 1, 0 }, { 10, 1, 0 }, {-10, 1, 0 }, { 11, 1, 0 }, {-11, 1, 0 }, { 12, 1, 0 },
		207	{-12, 1, 0 }, { 13, 1, 0 }, {-13, 1, 0 }, { 14, 1, 0 }, {-14, 1, 0 }, { 15, 1, 0 },
		208	{-15, 1, 0 }, { 16, 1, 0 }, {-16, 1, 0 }, { 1, 2, 0 }, { -1, 2, 0 }, { 17, 1, 0 },
		209	{-17, 1, 0 }, { 18, 1, 0 }, {-18, 1, 0 }, { 19, 1, 0 }, {-19, 1, 0 }, { 20, 1, 0 },
		210	{-20, 1, 0 }, { 21, 1, 0 }, {-21, 1, 0 }, { 2, 2, 0 }, { -2, 2, 0 }, { 22, 1, 0 },
		211	{-22, 1, 0 }, { 23, 1, 0 }, {-23, 1, 0 }, { 24, 1, 0 }, {-24, 1, 0 }, { 25, 1, 0 },
		212	{-25, 1, 0 }, { 3, 2, 0 }, { -3, 2, 0 }, { 26, 1, 0 }, {-26, 1, 0 }
		213	},
		214	//level_add
		215	{ 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 },
		216	2, //golomb_order
		217	INT_MAX, //inc_limit
		218	2, //max_run
		219	}
		220	};
		221
		222	static const struct dec_2dvlc inter_dec[7] = {
		223	{
		224	{ //level / run
		225	{ 1, 1, 1 }, { -1, 1, 1 }, { 1, 2, 1 }, { -1, 2, 1 }, { 1, 3, 1 }, { -1, 3, 1 },
		226	{ 1, 4, 1 }, { -1, 4, 1 }, { 1, 5, 1 }, { -1, 5, 1 }, { 1, 6, 1 }, { -1, 6, 1 },
		227	{ 1, 7, 1 }, { -1, 7, 1 }, { 1, 8, 1 }, { -1, 8, 1 }, { 1, 9, 1 }, { -1, 9, 1 },
		228	{ 1, 10, 1 }, { -1, 10, 1 }, { 1, 11, 1 }, { -1, 11, 1 }, { 1, 12, 1 }, { -1, 12, 1 },
		229	{ 1, 13, 1 }, { -1, 13, 1 }, { 2, 1, 2 }, { -2, 1, 2 }, { 1, 14, 1 }, { -1, 14, 1 },
		230	{ 1, 15, 1 }, { -1, 15, 1 }, { 1, 16, 1 }, { -1, 16, 1 }, { 1, 17, 1 }, { -1, 17, 1 },
		231	{ 1, 18, 1 }, { -1, 18, 1 }, { 1, 19, 1 }, { -1, 19, 1 }, { 3, 1, 3 }, { -3, 1, 3 },
		232	{ 1, 20, 1 }, { -1, 20, 1 }, { 1, 21, 1 }, { -1, 21, 1 }, { 2, 2, 2 }, { -2, 2, 2 },
		233	{ 1, 22, 1 }, { -1, 22, 1 }, { 1, 23, 1 }, { -1, 23, 1 }, { 1, 24, 1 }, { -1, 24, 1 },
		234	{ 1, 25, 1 }, { -1, 25, 1 }, { 1, 26, 1 }, { -1, 26, 1 }, { EOB }
		235	},
		236	//level_add
		237	{ 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 },
		238	3, //golomb_order
		239	0, //inc_limit
		240	26 //max_run
		241	},
		242	{
		243	{ //level / run
		244	{ 1, 1, 0 }, { -1, 1, 0 }, { EOB }, { 1, 2, 0 }, { -1, 2, 0 }, { 1, 3, 0 },
		245	{ -1, 3, 0 }, { 1, 4, 0 }, { -1, 4, 0 }, { 1, 5, 0 }, { -1, 5, 0 }, { 1, 6, 0 },
		246	{ -1, 6, 0 }, { 2, 1, 1 }, { -2, 1, 1 }, { 1, 7, 0 }, { -1, 7, 0 }, { 1, 8, 0 },
		247	{ -1, 8, 0 }, { 1, 9, 0 }, { -1, 9, 0 }, { 1, 10, 0 }, { -1, 10, 0 }, { 2, 2, 1 },
		248	{ -2, 2, 1 }, { 1, 11, 0 }, { -1, 11, 0 }, { 1, 12, 0 }, { -1, 12, 0 }, { 3, 1, 2 },
		249	{ -3, 1, 2 }, { 1, 13, 0 }, { -1, 13, 0 }, { 1, 14, 0 }, { -1, 14, 0 }, { 2, 3, 1 },
		250	{ -2, 3, 1 }, { 1, 15, 0 }, { -1, 15, 0 }, { 2, 4, 1 }, { -2, 4, 1 }, { 1, 16, 0 },
		251	{ -1, 16, 0 }, { 2, 5, 1 }, { -2, 5, 1 }, { 1, 17, 0 }, { -1, 17, 0 }, { 4, 1, 3 },
		252	{ -4, 1, 3 }, { 2, 6, 1 }, { -2, 6, 1 }, { 1, 18, 0 }, { -1, 18, 0 }, { 1, 19, 0 },
		253	{ -1, 19, 0 }, { 2, 7, 1 }, { -2, 7, 1 }, { 3, 2, 2 }, { -3, 2, 2 }
		254	},
		255	//level_add
		256	{ 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 },
		257	2, //golomb_order
		258	1, //inc_limit
		259	19 //max_run
		260	},
		261	{
		262	{ //level / run
		263	{ 1, 1, 0 }, { -1, 1, 0 }, { EOB }, { 1, 2, 0 }, { -1, 2, 0 }, { 2, 1, 0 },
		264	{ -2, 1, 0 }, { 1, 3, 0 }, { -1, 3, 0 }, { 1, 4, 0 }, { -1, 4, 0 }, { 3, 1, 1 },
		265	{ -3, 1, 1 }, { 2, 2, 0 }, { -2, 2, 0 }, { 1, 5, 0 }, { -1, 5, 0 }, { 1, 6, 0 },
		266	{ -1, 6, 0 }, { 1, 7, 0 }, { -1, 7, 0 }, { 2, 3, 0 }, { -2, 3, 0 }, { 4, 1, 2 },
		267	{ -4, 1, 2 }, { 1, 8, 0 }, { -1, 8, 0 }, { 3, 2, 1 }, { -3, 2, 1 }, { 2, 4, 0 },
		268	{ -2, 4, 0 }, { 1, 9, 0 }, { -1, 9, 0 }, { 1, 10, 0 }, { -1, 10, 0 }, { 5, 1, 2 },
		269	{ -5, 1, 2 }, { 2, 5, 0 }, { -2, 5, 0 }, { 1, 11, 0 }, { -1, 11, 0 }, { 2, 6, 0 },
		270	{ -2, 6, 0 }, { 1, 12, 0 }, { -1, 12, 0 }, { 3, 3, 1 }, { -3, 3, 1 }, { 6, 1, 2 },
		271	{ -6, 1, 2 }, { 4, 2, 2 }, { -4, 2, 2 }, { 1, 13, 0 }, { -1, 13, 0 }, { 2, 7, 0 },
		272	{ -2, 7, 0 }, { 3, 4, 1 }, { -3, 4, 1 }, { 1, 14, 0 }, { -1, 14, 0 }
		273	},
		274	//level_add
		275	{ 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 },
		276	2, //golomb_order
		277	2, //inc_limit
		278	14 //max_run
		279	},
		280	{
		281	{ //level / run
		282	{ 1, 1, 0 }, { -1, 1, 0 }, { EOB }, { 2, 1, 0 }, { -2, 1, 0 }, { 1, 2, 0 },
		283	{ -1, 2, 0 }, { 3, 1, 0 }, { -3, 1, 0 }, { 1, 3, 0 }, { -1, 3, 0 }, { 2, 2, 0 },
		284	{ -2, 2, 0 }, { 4, 1, 1 }, { -4, 1, 1 }, { 1, 4, 0 }, { -1, 4, 0 }, { 5, 1, 1 },
		285	{ -5, 1, 1 }, { 1, 5, 0 }, { -1, 5, 0 }, { 3, 2, 0 }, { -3, 2, 0 }, { 2, 3, 0 },
		286	{ -2, 3, 0 }, { 1, 6, 0 }, { -1, 6, 0 }, { 6, 1, 1 }, { -6, 1, 1 }, { 2, 4, 0 },
		287	{ -2, 4, 0 }, { 1, 7, 0 }, { -1, 7, 0 }, { 4, 2, 1 }, { -4, 2, 1 }, { 7, 1, 2 },
		288	{ -7, 1, 2 }, { 3, 3, 0 }, { -3, 3, 0 }, { 1, 8, 0 }, { -1, 8, 0 }, { 2, 5, 0 },
		289	{ -2, 5, 0 }, { 8, 1, 2 }, { -8, 1, 2 }, { 1, 9, 0 }, { -1, 9, 0 }, { 3, 4, 0 },
		290	{ -3, 4, 0 }, { 2, 6, 0 }, { -2, 6, 0 }, { 5, 2, 1 }, { -5, 2, 1 }, { 1, 10, 0 },
		291	{ -1, 10, 0 }, { 9, 1, 2 }, { -9, 1, 2 }, { 4, 3, 1 }, { -4, 3, 1 }
		292	},
		293	//level_add
		294	{ 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 },
		295	2, //golomb_order
		296	3, //inc_limit
		297	10 //max_run
		298	},
		299	{
		300	{ //level / run
		301	{ 1, 1, 0 }, { -1, 1, 0 }, { EOB }, { 2, 1, 0 }, { -2, 1, 0 }, { 3, 1, 0 },
		302	{ -3, 1, 0 }, { 1, 2, 0 }, { -1, 2, 0 }, { 4, 1, 0 }, { -4, 1, 0 }, { 5, 1, 0 },
		303	{ -5, 1, 0 }, { 2, 2, 0 }, { -2, 2, 0 }, { 1, 3, 0 }, { -1, 3, 0 }, { 6, 1, 0 },
		304	{ -6, 1, 0 }, { 3, 2, 0 }, { -3, 2, 0 }, { 7, 1, 1 }, { -7, 1, 1 }, { 1, 4, 0 },
		305	{ -1, 4, 0 }, { 8, 1, 1 }, { -8, 1, 1 }, { 2, 3, 0 }, { -2, 3, 0 }, { 4, 2, 0 },
		306	{ -4, 2, 0 }, { 1, 5, 0 }, { -1, 5, 0 }, { 9, 1, 1 }, { -9, 1, 1 }, { 5, 2, 0 },
		307	{ -5, 2, 0 }, { 2, 4, 0 }, { -2, 4, 0 }, { 1, 6, 0 }, { -1, 6, 0 }, { 10, 1, 2 },
		308	{-10, 1, 2 }, { 3, 3, 0 }, { -3, 3, 0 }, { 11, 1, 2 }, {-11, 1, 2 }, { 1, 7, 0 },
		309	{ -1, 7, 0 }, { 6, 2, 0 }, { -6, 2, 0 }, { 3, 4, 0 }, { -3, 4, 0 }, { 2, 5, 0 },
		310	{ -2, 5, 0 }, { 12, 1, 2 }, {-12, 1, 2 }, { 4, 3, 0 }, { -4, 3, 0 }
		311	},
		312	//level_add
		313	{ 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 },
		314	2, //golomb_order
		315	6, //inc_limit
		316	7 //max_run
		317	},
		318	{
		319	{ //level / run
		320	{ EOB }, { 1, 1, 0 }, { -1, 1, 0 }, { 2, 1, 0 }, { -2, 1, 0 }, { 3, 1, 0 },
		321	{ -3, 1, 0 }, { 4, 1, 0 }, { -4, 1, 0 }, { 5, 1, 0 }, { -5, 1, 0 }, { 1, 2, 0 },
		322	{ -1, 2, 0 }, { 6, 1, 0 }, { -6, 1, 0 }, { 7, 1, 0 }, { -7, 1, 0 }, { 8, 1, 0 },
		323	{ -8, 1, 0 }, { 2, 2, 0 }, { -2, 2, 0 }, { 9, 1, 0 }, { -9, 1, 0 }, { 1, 3, 0 },
		324	{ -1, 3, 0 }, { 10, 1, 1 }, { -10, 1, 1 }, { 3, 2, 0 }, { -3, 2, 0 }, { 11, 1, 1 },
		325	{ -11, 1, 1 }, { 4, 2, 0 }, { -4, 2, 0 }, { 12, 1, 1 }, { -12, 1, 1 }, { 1, 4, 0 },
		326	{ -1, 4, 0 }, { 2, 3, 0 }, { -2, 3, 0 }, { 13, 1, 1 }, { -13, 1, 1 }, { 5, 2, 0 },
		327	{ -5, 2, 0 }, { 14, 1, 1 }, { -14, 1, 1 }, { 6, 2, 0 }, { -6, 2, 0 }, { 1, 5, 0 },
		328	{ -1, 5, 0 }, { 15, 1, 1 }, { -15, 1, 1 }, { 3, 3, 0 }, { -3, 3, 0 }, { 16, 1, 1 },
		329	{ -16, 1, 1 }, { 2, 4, 0 }, { -2, 4, 0 }, { 7, 2, 0 }, { -7, 2, 0 }
		330	},
		331	//level_add
		332	{ 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 },
		333	2, //golomb_order
		334	9, //inc_limit
		335	5 //max_run
		336	},
		337	{
		338	{ //level / run
		339	{ EOB }, { 1, 1, 0 }, { -1, 1, 0 }, { 2, 1, 0 }, { -2, 1, 0 }, { 3, 1, 0 },
		340	{ -3, 1, 0 }, { 4, 1, 0 }, { -4, 1, 0 }, { 5, 1, 0 }, { -5, 1, 0 }, { 6, 1, 0 },
		341	{ -6, 1, 0 }, { 7, 1, 0 }, { -7, 1, 0 }, { 1, 2, 0 }, { -1, 2, 0 }, { 8, 1, 0 },
		342	{ -8, 1, 0 }, { 9, 1, 0 }, { -9, 1, 0 }, { 10, 1, 0 }, { -10, 1, 0 }, { 11, 1, 0 },
		343	{ -11, 1, 0 }, { 12, 1, 0 }, { -12, 1, 0 }, { 2, 2, 0 }, { -2, 2, 0 }, { 13, 1, 0 },
		344	{ -13, 1, 0 }, { 1, 3, 0 }, { -1, 3, 0 }, { 14, 1, 0 }, { -14, 1, 0 }, { 15, 1, 0 },
		345	{ -15, 1, 0 }, { 3, 2, 0 }, { -3, 2, 0 }, { 16, 1, 0 }, { -16, 1, 0 }, { 17, 1, 0 },
		346	{ -17, 1, 0 }, { 18, 1, 0 }, { -18, 1, 0 }, { 4, 2, 0 }, { -4, 2, 0 }, { 19, 1, 0 },
		347	{ -19, 1, 0 }, { 20, 1, 0 }, { -20, 1, 0 }, { 2, 3, 0 }, { -2, 3, 0 }, { 1, 4, 0 },
		348	{ -1, 4, 0 }, { 5, 2, 0 }, { -5, 2, 0 }, { 21, 1, 0 }, { -21, 1, 0 }
		349	},
		350	//level_add
		351	{ 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 },
		352	2, //golomb_order
		353	INT_MAX, //inc_limit
		354	4 //max_run
		355	}
		356	};
		357
		358	static const struct dec_2dvlc chroma_dec[5] = {
		359	{
		360	{ //level / run
		361	{ 1, 1, 1 }, { -1, 1, 1 }, { 1, 2, 1 }, { -1, 2, 1 }, { 1, 3, 1 }, { -1, 3, 1 },
		362	{ 1, 4, 1 }, { -1, 4, 1 }, { 1, 5, 1 }, { -1, 5, 1 }, { 1, 6, 1 }, { -1, 6, 1 },
		363	{ 1, 7, 1 }, { -1, 7, 1 }, { 2, 1, 2 }, { -2, 1, 2 }, { 1, 8, 1 }, { -1, 8, 1 },
		364	{ 1, 9, 1 }, { -1, 9, 1 }, { 1, 10, 1 }, { -1, 10, 1 }, { 1, 11, 1 }, { -1, 11, 1 },
		365	{ 1, 12, 1 }, { -1, 12, 1 }, { 1, 13, 1 }, { -1, 13, 1 }, { 1, 14, 1 }, { -1, 14, 1 },
		366	{ 1, 15, 1 }, { -1, 15, 1 }, { 3, 1, 3 }, { -3, 1, 3 }, { 1, 16, 1 }, { -1, 16, 1 },
		367	{ 1, 17, 1 }, { -1, 17, 1 }, { 1, 18, 1 }, { -1, 18, 1 }, { 1, 19, 1 }, { -1, 19, 1 },
		368	{ 1, 20, 1 }, { -1, 20, 1 }, { 1, 21, 1 }, { -1, 21, 1 }, { 1, 22, 1 }, { -1, 22, 1 },
		369	{ 2, 2, 2 }, { -2, 2, 2 }, { 1, 23, 1 }, { -1, 23, 1 }, { 1, 24, 1 }, { -1, 24, 1 },
		370	{ 1, 25, 1 }, { -1, 25, 1 }, { 4, 1, 3 }, { -4, 1, 3 }, { EOB }
		371	},
		372	//level_add
		373	{ 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 },
		374	2, //golomb_order
		375	0, //inc_limit
		376	25 //max_run
		377	},
		378	{
		379	{ //level / run
		380	{ EOB }, { 1, 1, 0 }, { -1, 1, 0 }, { 1, 2, 0 }, { -1, 2, 0 }, { 2, 1, 1 },
		381	{ -2, 1, 1 }, { 1, 3, 0 }, { -1, 3, 0 }, { 1, 4, 0 }, { -1, 4, 0 }, { 1, 5, 0 },
		382	{ -1, 5, 0 }, { 1, 6, 0 }, { -1, 6, 0 }, { 3, 1, 2 }, { -3, 1, 2 }, { 1, 7, 0 },
		383	{ -1, 7, 0 }, { 1, 8, 0 }, { -1, 8, 0 }, { 2, 2, 1 }, { -2, 2, 1 }, { 1, 9, 0 },
		384	{ -1, 9, 0 }, { 1, 10, 0 }, { -1, 10, 0 }, { 1, 11, 0 }, { -1, 11, 0 }, { 4, 1, 2 },
		385	{ -4, 1, 2 }, { 1, 12, 0 }, { -1, 12, 0 }, { 1, 13, 0 }, { -1, 13, 0 }, { 1, 14, 0 },
		386	{ -1, 14, 0 }, { 2, 3, 1 }, { -2, 3, 1 }, { 1, 15, 0 }, { -1, 15, 0 }, { 2, 4, 1 },
		387	{ -2, 4, 1 }, { 5, 1, 3 }, { -5, 1, 3 }, { 3, 2, 2 }, { -3, 2, 2 }, { 1, 16, 0 },
		388	{ -1, 16, 0 }, { 1, 17, 0 }, { -1, 17, 0 }, { 1, 18, 0 }, { -1, 18, 0 }, { 2, 5, 1 },
		389	{ -2, 5, 1 }, { 1, 19, 0 }, { -1, 19, 0 }, { 1, 20, 0 }, { -1, 20, 0 }
		390	},
		391	//level_add
		392	{ 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 },
		393	0, //golomb_order
		394	1, //inc_limit
		395	20 //max_run
		396	},
		397	{
		398	{ //level / run
		399	{ 1, 1, 0 }, { -1, 1, 0 }, { EOB }, { 2, 1, 0 }, { -2, 1, 0 }, { 1, 2, 0 },
		400	{ -1, 2, 0 }, { 3, 1, 1 }, { -3, 1, 1 }, { 1, 3, 0 }, { -1, 3, 0 }, { 4, 1, 1 },
		401	{ -4, 1, 1 }, { 2, 2, 0 }, { -2, 2, 0 }, { 1, 4, 0 }, { -1, 4, 0 }, { 5, 1, 2 },
		402	{ -5, 1, 2 }, { 1, 5, 0 }, { -1, 5, 0 }, { 3, 2, 1 }, { -3, 2, 1 }, { 2, 3, 0 },
		403	{ -2, 3, 0 }, { 1, 6, 0 }, { -1, 6, 0 }, { 6, 1, 2 }, { -6, 1, 2 }, { 1, 7, 0 },
		404	{ -1, 7, 0 }, { 2, 4, 0 }, { -2, 4, 0 }, { 7, 1, 2 }, { -7, 1, 2 }, { 1, 8, 0 },
		405	{ -1, 8, 0 }, { 4, 2, 1 }, { -4, 2, 1 }, { 1, 9, 0 }, { -1, 9, 0 }, { 3, 3, 1 },
		406	{ -3, 3, 1 }, { 2, 5, 0 }, { -2, 5, 0 }, { 2, 6, 0 }, { -2, 6, 0 }, { 8, 1, 2 },
		407	{ -8, 1, 2 }, { 1, 10, 0 }, { -1, 10, 0 }, { 1, 11, 0 }, { -1, 11, 0 }, { 9, 1, 2 },
		408	{ -9, 1, 2 }, { 5, 2, 2 }, { -5, 2, 2 }, { 3, 4, 1 }, { -3, 4, 1 },
		409	},
		410	//level_add
		411	{ 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 },
		412	1, //golomb_order
		413	2, //inc_limit
		414	11 //max_run
		415	},
		416	{
		417	{ //level / run
		418	{ EOB }, { 1, 1, 0 }, { -1, 1, 0 }, { 2, 1, 0 }, { -2, 1, 0 }, { 3, 1, 0 },
		419	{ -3, 1, 0 }, { 4, 1, 0 }, { -4, 1, 0 }, { 1, 2, 0 }, { -1, 2, 0 }, { 5, 1, 1 },
		420	{ -5, 1, 1 }, { 2, 2, 0 }, { -2, 2, 0 }, { 6, 1, 1 }, { -6, 1, 1 }, { 1, 3, 0 },
		421	{ -1, 3, 0 }, { 7, 1, 1 }, { -7, 1, 1 }, { 3, 2, 0 }, { -3, 2, 0 }, { 8, 1, 1 },
		422	{ -8, 1, 1 }, { 1, 4, 0 }, { -1, 4, 0 }, { 2, 3, 0 }, { -2, 3, 0 }, { 9, 1, 1 },
		423	{ -9, 1, 1 }, { 4, 2, 0 }, { -4, 2, 0 }, { 1, 5, 0 }, { -1, 5, 0 }, { 10, 1, 1 },
		424	{-10, 1, 1 }, { 3, 3, 0 }, { -3, 3, 0 }, { 5, 2, 1 }, { -5, 2, 1 }, { 2, 4, 0 },
		425	{ -2, 4, 0 }, { 11, 1, 1 }, {-11, 1, 1 }, { 1, 6, 0 }, { -1, 6, 0 }, { 12, 1, 1 },
		426	{-12, 1, 1 }, { 1, 7, 0 }, { -1, 7, 0 }, { 6, 2, 1 }, { -6, 2, 1 }, { 13, 1, 1 },
		427	{-13, 1, 1 }, { 2, 5, 0 }, { -2, 5, 0 }, { 1, 8, 0 }, { -1, 8, 0 },
		428	},
		429	//level_add
		430	{ 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 },
		431	1, //golomb_order
		432	4, //inc_limit
		433	8 //max_run
		434	},
		435	{
		436	{ //level / run
		437	{ EOB }, { 1, 1, 0 }, { -1, 1, 0 }, { 2, 1, 0 }, { -2, 1, 0 }, { 3, 1, 0 },
		438	{ -3, 1, 0 }, { 4, 1, 0 }, { -4, 1, 0 }, { 5, 1, 0 }, { -5, 1, 0 }, { 6, 1, 0 },
		439	{ -6, 1, 0 }, { 7, 1, 0 }, { -7, 1, 0 }, { 8, 1, 0 }, { -8, 1, 0 }, { 1, 2, 0 },
		440	{ -1, 2, 0 }, { 9, 1, 0 }, { -9, 1, 0 }, { 10, 1, 0 }, { -10, 1, 0 }, { 11, 1, 0 },
		441	{ -11, 1, 0 }, { 2, 2, 0 }, { -2, 2, 0 }, { 12, 1, 0 }, { -12, 1, 0 }, { 13, 1, 0 },
		442	{ -13, 1, 0 }, { 3, 2, 0 }, { -3, 2, 0 }, { 14, 1, 0 }, { -14, 1, 0 }, { 1, 3, 0 },
		443	{ -1, 3, 0 }, { 15, 1, 0 }, { -15, 1, 0 }, { 4, 2, 0 }, { -4, 2, 0 }, { 16, 1, 0 },
		444	{ -16, 1, 0 }, { 17, 1, 0 }, { -17, 1, 0 }, { 5, 2, 0 }, { -5, 2, 0 }, { 1, 4, 0 },
		445	{ -1, 4, 0 }, { 2, 3, 0 }, { -2, 3, 0 }, { 18, 1, 0 }, { -18, 1, 0 }, { 6, 2, 0 },
		446	{ -6, 2, 0 }, { 19, 1, 0 }, { -19, 1, 0 }, { 1, 5, 0 }, { -1, 5, 0 },
		447	},
		448	//level_add
		449	{ 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 },
		450	0, //golomb_order
		451	INT_MAX, //inc_limit
		452	5, //max_run
		453	}
		454	};
		455
		456	#undef EOB
		457
		458	/*****************************************************************************
		459	*
		460	* motion vector prediction
		461	*
		462	****************************************************************************/
		463
		464	static inline void store_mvs(AVSContext *h)
		465	{
		466	h->col_mv[h->mbidx * 4 + 0] = h->mv[MV_FWD_X0];
		467	h->col_mv[h->mbidx * 4 + 1] = h->mv[MV_FWD_X1];
		468	h->col_mv[h->mbidx * 4 + 2] = h->mv[MV_FWD_X2];
		469	h->col_mv[h->mbidx * 4 + 3] = h->mv[MV_FWD_X3];
		470	}
		471
		472	static inline void mv_pred_direct(AVSContext h, cavs_vector pmv_fw,
		473	cavs_vector *col_mv)
		474	{
		475	cavs_vector *pmv_bw = pmv_fw + MV_BWD_OFFS;
		476	int den = h->direct_den[col_mv->ref];
		477	int m = col_mv->x >> 31;
		478
		479	pmv_fw->dist = h->dist[1];
		480	pmv_bw->dist = h->dist[0];
		481	pmv_fw->ref = 1;
		482	pmv_bw->ref = 0;
		483	/* scale the co-located motion vector according to its temporal span */
		484	pmv_fw->x = (((den + (den * col_mv->x * pmv_fw->dist ^ m) - m - 1) >> 14) ^ m) - m;
		485	pmv_bw->x = m - (((den + (den * col_mv->x * pmv_bw->dist ^ m) - m - 1) >> 14) ^ m);
		486	m = col_mv->y >> 31;
		487	pmv_fw->y = (((den + (den * col_mv->y * pmv_fw->dist ^ m) - m - 1) >> 14) ^ m) - m;
		488	pmv_bw->y = m - (((den + (den * col_mv->y * pmv_bw->dist ^ m) - m - 1) >> 14) ^ m);
		489	}
		490
		491	static inline void mv_pred_sym(AVSContext h, cavs_vector src,
		492	enum cavs_block size)
		493	{
		494	cavs_vector *dst = src + MV_BWD_OFFS;
		495
		496	/* backward mv is the scaled and negated forward mv */
		497	dst->x = -((src->x * h->sym_factor + 256) >> 9);
		498	dst->y = -((src->y * h->sym_factor + 256) >> 9);
		499	dst->ref = 0;
		500	dst->dist = h->dist[0];
		501	set_mvs(dst, size);
		502	}
		503
		504	/*****************************************************************************
		505	*
		506	* residual data decoding
		507	*
		508	****************************************************************************/
		509
		510	/** kth-order exponential golomb code */
		511	static inline int get_ue_code(GetBitContext *gb, int order)
		512	{
		513	unsigned ret = get_ue_golomb(gb);
		514	if (ret >= ((1U<<31)>>order)) {
		515	av_log(NULL, AV_LOG_ERROR, "get_ue_code: value too larger\n");
		516	return AVERROR_INVALIDDATA;
		517	}
		518	if (order) {
		519	return (ret<
		520	}
		521	return ret;
		522	}
		523
		524	static inline int dequant(AVSContext h, int16_t level_buf, uint8_t *run_buf,
		525	int16_t *dst, int mul, int shift, int coeff_num)
		526	{
		527	int round = 1 << (shift - 1);
		528	int pos = -1;
		529	const uint8_t *scantab = h->scantable.permutated;
		530
		531	/* inverse scan and dequantization */
		532	while (--coeff_num >= 0) {
		533	pos += run_buf[coeff_num];
		534	if (pos > 63) {
		535	av_log(h->avctx, AV_LOG_ERROR,
		536	"position out of block bounds at pic %d MB(%d,%d)\n",
		537	h->cur.poc, h->mbx, h->mby);
		538	return AVERROR_INVALIDDATA;
		539	}
		540	dst[scantab[pos]] = (level_buf[coeff_num] * mul + round) >> shift;
		541	}
		542	return 0;
		543	}
		544
		545	/**
		546	* decode coefficients from one 8x8 block, dequantize, inverse transform
		547	* and add them to sample block
		548	* @param r pointer to 2D VLC table
		549	* @param esc_golomb_order escape codes are k-golomb with this order k
		550	* @param qp quantizer
		551	* @param dst location of sample block
		552	* @param stride line stride in frame buffer
		553	*/
		554	static int decode_residual_block(AVSContext h, GetBitContext gb,
		555	const struct dec_2dvlc *r, int esc_golomb_order,
		556	int qp, uint8_t *dst, int stride)
		557	{
		558	int i, esc_code, level, mask, ret;
		559	unsigned int level_code, run;
		560	int16_t level_buf[65];
		561	uint8_t run_buf[65];
		562	int16_t *block = h->block;
		563
		564	for (i = 0; i < 65; i++) {
		565	level_code = get_ue_code(gb, r->golomb_order);
		566	if (level_code >= ESCAPE_CODE) {
		567	run = ((level_code - ESCAPE_CODE) >> 1) + 1;
		568	if(run > 64)
		569	return -1;
		570	esc_code = get_ue_code(gb, esc_golomb_order);
		571	level = esc_code + (run > r->max_run ? 1 : r->level_add[run]);
		572	while (level > r->inc_limit)
		573	r++;
		574	mask = -(level_code & 1);
		575	level = (level ^ mask) - mask;
		576	} else {
		577	level = r->rltab[level_code][0];
		578	if (!level) //end of block signal
		579	break;
		580	run = r->rltab[level_code][1];
		581	r += r->rltab[level_code][2];
		582	}
		583	level_buf[i] = level;
		584	run_buf[i] = run;
		585	}
		586	if ((ret = dequant(h, level_buf, run_buf, block, dequant_mul[qp],
		587	dequant_shift[qp], i)) < 0)
		588	return ret;
		589	h->cdsp.cavs_idct8_add(dst, block, stride);
		590	h->dsp.clear_block(block);
		591	return 0;
		592	}
		593
		594
		595	static inline void decode_residual_chroma(AVSContext *h)
		596	{
		597	if (h->cbp & (1 << 4))
		598	decode_residual_block(h, &h->gb, chroma_dec, 0,
		599	cavs_chroma_qp[h->qp], h->cu, h->c_stride);
		600	if (h->cbp & (1 << 5))
		601	decode_residual_block(h, &h->gb, chroma_dec, 0,
		602	cavs_chroma_qp[h->qp], h->cv, h->c_stride);
		603	}
		604
		605	static inline int decode_residual_inter(AVSContext *h)
		606	{
		607	int block;
		608
		609	/* get coded block pattern */
		610	int cbp = get_ue_golomb(&h->gb);
		611	if (cbp > 63U) {
		612	av_log(h->avctx, AV_LOG_ERROR, "illegal inter cbp %d\n", cbp);
		613	return AVERROR_INVALIDDATA;
		614	}
		615	h->cbp = cbp_tab[cbp][1];
		616
		617	/* get quantizer */
		618	if (h->cbp && !h->qp_fixed)
		619	h->qp = (h->qp + get_se_golomb(&h->gb)) & 63;
		620	for (block = 0; block < 4; block++)
		621	if (h->cbp & (1 << block))
		622	decode_residual_block(h, &h->gb, inter_dec, 0, h->qp,
		623	h->cy + h->luma_scan[block], h->l_stride);
		624	decode_residual_chroma(h);
		625
		626	return 0;
		627	}
		628
		629	/*****************************************************************************
		630	*
		631	* macroblock level
		632	*
		633	****************************************************************************/
		634
		635	static inline void set_mv_intra(AVSContext *h)
		636	{
		637	h->mv[MV_FWD_X0] = ff_cavs_intra_mv;
		638	set_mvs(&h->mv[MV_FWD_X0], BLK_16X16);
		639	h->mv[MV_BWD_X0] = ff_cavs_intra_mv;
		640	set_mvs(&h->mv[MV_BWD_X0], BLK_16X16);
		641	if (h->cur.f->pict_type != AV_PICTURE_TYPE_B)
		642	h->col_type_base[h->mbidx] = I_8X8;
		643	}
		644
		645	static int decode_mb_i(AVSContext *h, int cbp_code)
		646	{
		647	GetBitContext *gb = &h->gb;
		648	unsigned pred_mode_uv;
		649	int block;
		650	uint8_t top[18];
		651	uint8_t *left = NULL;
		652	uint8_t *d;
		653
		654	ff_cavs_init_mb(h);
		655
		656	/* get intra prediction modes from stream */
		657	for (block = 0; block < 4; block++) {
		658	int nA, nB, predpred;
		659	int pos = scan3x3[block];
		660
		661	nA = h->pred_mode_Y[pos - 1];
		662	nB = h->pred_mode_Y[pos - 3];
		663	predpred = FFMIN(nA, nB);
		664	if (predpred == NOT_AVAIL) // if either is not available
		665	predpred = INTRA_L_LP;
		666	if (!get_bits1(gb)) {
		667	int rem_mode = get_bits(gb, 2);
		668	predpred = rem_mode + (rem_mode >= predpred);
		669	}
		670	h->pred_mode_Y[pos] = predpred;
		671	}
		672	pred_mode_uv = get_ue_golomb(gb);
		673	if (pred_mode_uv > 6) {
		674	av_log(h->avctx, AV_LOG_ERROR, "illegal intra chroma pred mode\n");
		675	return AVERROR_INVALIDDATA;
		676	}
		677	ff_cavs_modify_mb_i(h, &pred_mode_uv);
		678
		679	/* get coded block pattern */
		680	if (h->cur.f->pict_type == AV_PICTURE_TYPE_I)
		681	cbp_code = get_ue_golomb(gb);
		682	if (cbp_code > 63U) {
		683	av_log(h->avctx, AV_LOG_ERROR, "illegal intra cbp\n");
		684	return AVERROR_INVALIDDATA;
		685	}
		686	h->cbp = cbp_tab[cbp_code][0];
		687	if (h->cbp && !h->qp_fixed)
		688	h->qp = (h->qp + get_se_golomb(gb)) & 63; //qp_delta
		689
		690	/* luma intra prediction interleaved with residual decode/transform/add */
		691	for (block = 0; block < 4; block++) {
		692	d = h->cy + h->luma_scan[block];
		693	ff_cavs_load_intra_pred_luma(h, top, &left, block);
		694	h->intra_pred_l[h->pred_mode_Y[scan3x3[block]]]
		695	(d, top, left, h->l_stride);
		696	if (h->cbp & (1<
		697	decode_residual_block(h, gb, intra_dec, 1, h->qp, d, h->l_stride);
		698	}
		699
		700	/* chroma intra prediction */
		701	ff_cavs_load_intra_pred_chroma(h);
		702	h->intra_pred_c[pred_mode_uv](h->cu, &h->top_border_u[h->mbx * 10],
		703	h->left_border_u, h->c_stride);
		704	h->intra_pred_c[pred_mode_uv](h->cv, &h->top_border_v[h->mbx * 10],
		705	h->left_border_v, h->c_stride);
		706
		707	decode_residual_chroma(h);
		708	ff_cavs_filter(h, I_8X8);
		709	set_mv_intra(h);
		710	return 0;
		711	}
		712
		713	static inline void set_intra_mode_default(AVSContext *h)
		714	{
		715	if (h->stream_revision > 0) {
		716	h->pred_mode_Y[3] = h->pred_mode_Y[6] = NOT_AVAIL;
		717	h->top_pred_Y[h->mbx * 2 + 0] = h->top_pred_Y[h->mbx * 2 + 1] = NOT_AVAIL;
		718	} else {
		719	h->pred_mode_Y[3] = h->pred_mode_Y[6] = INTRA_L_LP;
		720	h->top_pred_Y[h->mbx * 2 + 0] = h->top_pred_Y[h->mbx * 2 + 1] = INTRA_L_LP;
		721	}
		722	}
		723
		724	static void decode_mb_p(AVSContext *h, enum cavs_mb mb_type)
		725	{
		726	GetBitContext *gb = &h->gb;
		727	int ref[4];
		728
		729	ff_cavs_init_mb(h);
		730	switch (mb_type) {
		731	case P_SKIP:
		732	ff_cavs_mv(h, MV_FWD_X0, MV_FWD_C2, MV_PRED_PSKIP, BLK_16X16, 0);
		733	break;
		734	case P_16X16:
		735	ref[0] = h->ref_flag ? 0 : get_bits1(gb);
		736	ff_cavs_mv(h, MV_FWD_X0, MV_FWD_C2, MV_PRED_MEDIAN, BLK_16X16, ref[0]);
		737	break;
		738	case P_16X8:
		739	ref[0] = h->ref_flag ? 0 : get_bits1(gb);
		740	ref[2] = h->ref_flag ? 0 : get_bits1(gb);
		741	ff_cavs_mv(h, MV_FWD_X0, MV_FWD_C2, MV_PRED_TOP, BLK_16X8, ref[0]);
		742	ff_cavs_mv(h, MV_FWD_X2, MV_FWD_A1, MV_PRED_LEFT, BLK_16X8, ref[2]);
		743	break;
		744	case P_8X16:
		745	ref[0] = h->ref_flag ? 0 : get_bits1(gb);
		746	ref[1] = h->ref_flag ? 0 : get_bits1(gb);
		747	ff_cavs_mv(h, MV_FWD_X0, MV_FWD_B3, MV_PRED_LEFT, BLK_8X16, ref[0]);
		748	ff_cavs_mv(h, MV_FWD_X1, MV_FWD_C2, MV_PRED_TOPRIGHT, BLK_8X16, ref[1]);
		749	break;
		750	case P_8X8:
		751	ref[0] = h->ref_flag ? 0 : get_bits1(gb);
		752	ref[1] = h->ref_flag ? 0 : get_bits1(gb);
		753	ref[2] = h->ref_flag ? 0 : get_bits1(gb);
		754	ref[3] = h->ref_flag ? 0 : get_bits1(gb);
		755	ff_cavs_mv(h, MV_FWD_X0, MV_FWD_B3, MV_PRED_MEDIAN, BLK_8X8, ref[0]);
		756	ff_cavs_mv(h, MV_FWD_X1, MV_FWD_C2, MV_PRED_MEDIAN, BLK_8X8, ref[1]);
		757	ff_cavs_mv(h, MV_FWD_X2, MV_FWD_X1, MV_PRED_MEDIAN, BLK_8X8, ref[2]);
		758	ff_cavs_mv(h, MV_FWD_X3, MV_FWD_X0, MV_PRED_MEDIAN, BLK_8X8, ref[3]);
		759	}
		760	ff_cavs_inter(h, mb_type);
		761	set_intra_mode_default(h);
		762	store_mvs(h);
		763	if (mb_type != P_SKIP)
		764	decode_residual_inter(h);
		765	ff_cavs_filter(h, mb_type);
		766	h->col_type_base[h->mbidx] = mb_type;
		767	}
		768
		769	static int decode_mb_b(AVSContext *h, enum cavs_mb mb_type)
		770	{
		771	int block;
		772	enum cavs_sub_mb sub_type[4];
		773	int flags;
		774
		775	ff_cavs_init_mb(h);
		776
		777	/* reset all MVs */
		778	h->mv[MV_FWD_X0] = ff_cavs_dir_mv;
		779	set_mvs(&h->mv[MV_FWD_X0], BLK_16X16);
		780	h->mv[MV_BWD_X0] = ff_cavs_dir_mv;
		781	set_mvs(&h->mv[MV_BWD_X0], BLK_16X16);
		782	switch (mb_type) {
		783	case B_SKIP:
		784	case B_DIRECT:
		785	if (!h->col_type_base[h->mbidx]) {
		786	/* intra MB at co-location, do in-plane prediction */
		787	ff_cavs_mv(h, MV_FWD_X0, MV_FWD_C2, MV_PRED_BSKIP, BLK_16X16, 1);
		788	ff_cavs_mv(h, MV_BWD_X0, MV_BWD_C2, MV_PRED_BSKIP, BLK_16X16, 0);
		789	} else
		790	/* direct prediction from co-located P MB, block-wise */
		791	for (block = 0; block < 4; block++)
		792	mv_pred_direct(h, &h->mv[mv_scan[block]],
		793	&h->col_mv[h->mbidx * 4 + block]);
		794	break;
		795	case B_FWD_16X16:
		796	ff_cavs_mv(h, MV_FWD_X0, MV_FWD_C2, MV_PRED_MEDIAN, BLK_16X16, 1);
		797	break;
		798	case B_SYM_16X16:
		799	ff_cavs_mv(h, MV_FWD_X0, MV_FWD_C2, MV_PRED_MEDIAN, BLK_16X16, 1);
		800	mv_pred_sym(h, &h->mv[MV_FWD_X0], BLK_16X16);
		801	break;
		802	case B_BWD_16X16:
		803	ff_cavs_mv(h, MV_BWD_X0, MV_BWD_C2, MV_PRED_MEDIAN, BLK_16X16, 0);
		804	break;
		805	case B_8X8:
		806	for (block = 0; block < 4; block++)
		807	sub_type[block] = get_bits(&h->gb, 2);
		808	for (block = 0; block < 4; block++) {
		809	switch (sub_type[block]) {
		810	case B_SUB_DIRECT:
		811	if (!h->col_type_base[h->mbidx]) {
		812	/* intra MB at co-location, do in-plane prediction */
		813	ff_cavs_mv(h, mv_scan[block], mv_scan[block] - 3,
		814	MV_PRED_BSKIP, BLK_8X8, 1);
		815	ff_cavs_mv(h, mv_scan[block] + MV_BWD_OFFS,
		816	mv_scan[block] - 3 + MV_BWD_OFFS,
		817	MV_PRED_BSKIP, BLK_8X8, 0);
		818	} else
		819	mv_pred_direct(h, &h->mv[mv_scan[block]],
		820	&h->col_mv[h->mbidx * 4 + block]);
		821	break;
		822	case B_SUB_FWD:
		823	ff_cavs_mv(h, mv_scan[block], mv_scan[block] - 3,
		824	MV_PRED_MEDIAN, BLK_8X8, 1);
		825	break;
		826	case B_SUB_SYM:
		827	ff_cavs_mv(h, mv_scan[block], mv_scan[block] - 3,
		828	MV_PRED_MEDIAN, BLK_8X8, 1);
		829	mv_pred_sym(h, &h->mv[mv_scan[block]], BLK_8X8);
		830	break;
		831	}
		832	}
		833	for (block = 0; block < 4; block++) {
		834	if (sub_type[block] == B_SUB_BWD)
		835	ff_cavs_mv(h, mv_scan[block] + MV_BWD_OFFS,
		836	mv_scan[block] + MV_BWD_OFFS - 3,
		837	MV_PRED_MEDIAN, BLK_8X8, 0);
		838	}
		839	break;
		840	default:
		841	if (mb_type <= B_SYM_16X16) {
		842	av_log(h->avctx, AV_LOG_ERROR, "Invalid mb_type %d in B frame\n", mb_type);
		843	return AVERROR_INVALIDDATA;
		844	}
		845	av_assert2(mb_type < B_8X8);
		846	flags = ff_cavs_partition_flags[mb_type];
		847	if (mb_type & 1) { /* 16x8 macroblock types */
		848	if (flags & FWD0)
		849	ff_cavs_mv(h, MV_FWD_X0, MV_FWD_C2, MV_PRED_TOP, BLK_16X8, 1);
		850	if (flags & SYM0)
		851	mv_pred_sym(h, &h->mv[MV_FWD_X0], BLK_16X8);
		852	if (flags & FWD1)
		853	ff_cavs_mv(h, MV_FWD_X2, MV_FWD_A1, MV_PRED_LEFT, BLK_16X8, 1);
		854	if (flags & SYM1)
		855	mv_pred_sym(h, &h->mv[MV_FWD_X2], BLK_16X8);
		856	if (flags & BWD0)
		857	ff_cavs_mv(h, MV_BWD_X0, MV_BWD_C2, MV_PRED_TOP, BLK_16X8, 0);
		858	if (flags & BWD1)
		859	ff_cavs_mv(h, MV_BWD_X2, MV_BWD_A1, MV_PRED_LEFT, BLK_16X8, 0);
		860	} else { /* 8x16 macroblock types */
		861	if (flags & FWD0)
		862	ff_cavs_mv(h, MV_FWD_X0, MV_FWD_B3, MV_PRED_LEFT, BLK_8X16, 1);
		863	if (flags & SYM0)
		864	mv_pred_sym(h, &h->mv[MV_FWD_X0], BLK_8X16);
		865	if (flags & FWD1)
		866	ff_cavs_mv(h, MV_FWD_X1, MV_FWD_C2, MV_PRED_TOPRIGHT, BLK_8X16, 1);
		867	if (flags & SYM1)
		868	mv_pred_sym(h, &h->mv[MV_FWD_X1], BLK_8X16);
		869	if (flags & BWD0)
		870	ff_cavs_mv(h, MV_BWD_X0, MV_BWD_B3, MV_PRED_LEFT, BLK_8X16, 0);
		871	if (flags & BWD1)
		872	ff_cavs_mv(h, MV_BWD_X1, MV_BWD_C2, MV_PRED_TOPRIGHT, BLK_8X16, 0);
		873	}
		874	}
		875	ff_cavs_inter(h, mb_type);
		876	set_intra_mode_default(h);
		877	if (mb_type != B_SKIP)
		878	decode_residual_inter(h);
		879	ff_cavs_filter(h, mb_type);
		880
		881	return 0;
		882	}
		883
		884	/*****************************************************************************
		885	*
		886	* slice level
		887	*
		888	****************************************************************************/
		889
		890	static inline int decode_slice_header(AVSContext h, GetBitContext gb)
		891	{
		892	if (h->stc > 0xAF)
		893	av_log(h->avctx, AV_LOG_ERROR, "unexpected start code 0x%02x\n", h->stc);
		894
		895	if (h->stc >= h->mb_height)
		896	return -1;
		897
		898	h->mby = h->stc;
		899	h->mbidx = h->mby * h->mb_width;
		900
		901	/* mark top macroblocks as unavailable */
		902	h->flags &= ~(B_AVAIL \| C_AVAIL);
		903	if ((h->mby == 0) && (!h->qp_fixed)) {
		904	h->qp_fixed = get_bits1(gb);
		905	h->qp = get_bits(gb, 6);
		906	}
		907	/* inter frame or second slice can have weighting params */
		908	if ((h->cur.f->pict_type != AV_PICTURE_TYPE_I) \|\|
		909	(!h->pic_structure && h->mby >= h->mb_width / 2))
		910	if (get_bits1(gb)) { //slice_weighting_flag
		911	av_log(h->avctx, AV_LOG_ERROR,
		912	"weighted prediction not yet supported\n");
		913	}
		914	return 0;
		915	}
		916
		917	static inline int check_for_slice(AVSContext *h)
		918	{
		919	GetBitContext *gb = &h->gb;
		920	int align;
		921
		922	if (h->mbx)
		923	return 0;
		924	align = (-get_bits_count(gb)) & 7;
		925	/* check for stuffing byte */
		926	if (!align && (show_bits(gb, 8) == 0x80))
		927	align = 8;
		928	if ((show_bits_long(gb, 24 + align) & 0xFFFFFF) == 0x000001) {
		929	skip_bits_long(gb, 24 + align);
		930	h->stc = get_bits(gb, 8);
		931	if (h->stc >= h->mb_height)
		932	return 0;
		933	decode_slice_header(h, gb);
		934	return 1;
		935	}
		936	return 0;
		937	}
		938
		939	/*****************************************************************************
		940	*
		941	* frame level
		942	*
		943	****************************************************************************/
		944
		945	static int decode_pic(AVSContext *h)
		946	{
		947	int skip_count = -1;
		948	int ret;
		949	enum cavs_mb mb_type;
		950
		951	if (!h->top_qp) {
		952	av_log(h->avctx, AV_LOG_ERROR, "No sequence header decoded yet\n");
		953	return AVERROR_INVALIDDATA;
		954	}
		955
		956	av_frame_unref(h->cur.f);
		957
		958	skip_bits(&h->gb, 16);//bbv_dwlay
		959	if (h->stc == PIC_PB_START_CODE) {
		960	h->cur.f->pict_type = get_bits(&h->gb, 2) + AV_PICTURE_TYPE_I;
		961	if (h->cur.f->pict_type > AV_PICTURE_TYPE_B) {
		962	av_log(h->avctx, AV_LOG_ERROR, "illegal picture type\n");
		963	return AVERROR_INVALIDDATA;
		964	}
		965	/* make sure we have the reference frames we need */
		966	if (!h->DPB[0].f->data[0] \|\|
		967	(!h->DPB[1].f->data[0] && h->cur.f->pict_type == AV_PICTURE_TYPE_B))
		968	return AVERROR_INVALIDDATA;
		969	} else {
		970	h->cur.f->pict_type = AV_PICTURE_TYPE_I;
		971	if (get_bits1(&h->gb))
		972	skip_bits(&h->gb, 24);//time_code
		973	/* old sample clips were all progressive and no low_delay,
		974	bump stream revision if detected otherwise */
		975	if (h->low_delay \|\| !(show_bits(&h->gb, 9) & 1))
		976	h->stream_revision = 1;
		977	/* similarly test top_field_first and repeat_first_field */
		978	else if (show_bits(&h->gb, 11) & 3)
		979	h->stream_revision = 1;
		980	if (h->stream_revision > 0)
		981	skip_bits(&h->gb, 1); //marker_bit
		982	}
		983
		984	if ((ret = ff_get_buffer(h->avctx, h->cur.f,
		985	h->cur.f->pict_type == AV_PICTURE_TYPE_B ?
		986
		987	return ret;
		988
		989	if (!h->edge_emu_buffer) {
		990	int alloc_size = FFALIGN(FFABS(h->cur.f->linesize[0]) + 32, 32);
		991	h->edge_emu_buffer = av_mallocz(alloc_size * 2 * 24);
		992	if (!h->edge_emu_buffer)
		993	return AVERROR(ENOMEM);
		994	}
		995
		996	if ((ret = ff_cavs_init_pic(h)) < 0)
		997	return ret;
		998	h->cur.poc = get_bits(&h->gb, 8) * 2;
		999
		1000	/* get temporal distances and MV scaling factors */
		1001	if (h->cur.f->pict_type != AV_PICTURE_TYPE_B) {
		1002	h->dist[0] = (h->cur.poc - h->DPB[0].poc + 512) % 512;
		1003	} else {
		1004	h->dist[0] = (h->DPB[0].poc - h->cur.poc + 512) % 512;
		1005	}
		1006	h->dist[1] = (h->cur.poc - h->DPB[1].poc + 512) % 512;
		1007	h->scale_den[0] = h->dist[0] ? 512/h->dist[0] : 0;
		1008	h->scale_den[1] = h->dist[1] ? 512/h->dist[1] : 0;
		1009	if (h->cur.f->pict_type == AV_PICTURE_TYPE_B) {
		1010	h->sym_factor = h->dist[0] * h->scale_den[1];
		1011	} else {
		1012	h->direct_den[0] = h->dist[0] ? 16384 / h->dist[0] : 0;
		1013	h->direct_den[1] = h->dist[1] ? 16384 / h->dist[1] : 0;
		1014	}
		1015
		1016	if (h->low_delay)
		1017	get_ue_golomb(&h->gb); //bbv_check_times
		1018	h->progressive = get_bits1(&h->gb);
		1019	h->pic_structure = 1;
		1020	if (!h->progressive)
		1021	h->pic_structure = get_bits1(&h->gb);
		1022	if (!h->pic_structure && h->stc == PIC_PB_START_CODE)
		1023	skip_bits1(&h->gb); //advanced_pred_mode_disable
		1024	skip_bits1(&h->gb); //top_field_first
		1025	skip_bits1(&h->gb); //repeat_first_field
		1026	h->qp_fixed = get_bits1(&h->gb);
		1027	h->qp = get_bits(&h->gb, 6);
		1028	if (h->cur.f->pict_type == AV_PICTURE_TYPE_I) {
		1029	if (!h->progressive && !h->pic_structure)
		1030	skip_bits1(&h->gb);//what is this?
		1031	skip_bits(&h->gb, 4); //reserved bits
		1032	} else {
		1033	if (!(h->cur.f->pict_type == AV_PICTURE_TYPE_B && h->pic_structure == 1))
		1034	h->ref_flag = get_bits1(&h->gb);
		1035	skip_bits(&h->gb, 4); //reserved bits
		1036	h->skip_mode_flag = get_bits1(&h->gb);
		1037	}
		1038	h->loop_filter_disable = get_bits1(&h->gb);
		1039	if (!h->loop_filter_disable && get_bits1(&h->gb)) {
		1040	h->alpha_offset = get_se_golomb(&h->gb);
		1041	h->beta_offset = get_se_golomb(&h->gb);
		1042	} else {
		1043	h->alpha_offset = h->beta_offset = 0;
		1044	}
		1045	if (h->cur.f->pict_type == AV_PICTURE_TYPE_I) {
		1046	do {
		1047	check_for_slice(h);
		1048	decode_mb_i(h, 0);
		1049	} while (ff_cavs_next_mb(h));
		1050	} else if (h->cur.f->pict_type == AV_PICTURE_TYPE_P) {
		1051	do {
		1052	if (check_for_slice(h))
		1053	skip_count = -1;
		1054	if (h->skip_mode_flag && (skip_count < 0))
		1055	skip_count = get_ue_golomb(&h->gb);
		1056	if (h->skip_mode_flag && skip_count--) {
		1057	decode_mb_p(h, P_SKIP);
		1058	} else {
		1059	mb_type = get_ue_golomb(&h->gb) + P_SKIP + h->skip_mode_flag;
		1060	if (mb_type > P_8X8)
		1061	decode_mb_i(h, mb_type - P_8X8 - 1);
		1062	else
		1063	decode_mb_p(h, mb_type);
		1064	}
		1065	} while (ff_cavs_next_mb(h));
		1066	} else { /* AV_PICTURE_TYPE_B */
		1067	do {
		1068	if (check_for_slice(h))
		1069	skip_count = -1;
		1070	if (h->skip_mode_flag && (skip_count < 0))
		1071	skip_count = get_ue_golomb(&h->gb);
		1072	if (h->skip_mode_flag && skip_count--) {
		1073	decode_mb_b(h, B_SKIP);
		1074	} else {
		1075	mb_type = get_ue_golomb(&h->gb) + B_SKIP + h->skip_mode_flag;
		1076	if (mb_type > B_8X8)
		1077	decode_mb_i(h, mb_type - B_8X8 - 1);
		1078	else
		1079	decode_mb_b(h, mb_type);
		1080	}
		1081	} while (ff_cavs_next_mb(h));
		1082	}
		1083	if (h->cur.f->pict_type != AV_PICTURE_TYPE_B) {
		1084	av_frame_unref(h->DPB[1].f);
		1085	FFSWAP(AVSFrame, h->cur, h->DPB[1]);
		1086	FFSWAP(AVSFrame, h->DPB[0], h->DPB[1]);
		1087	}
		1088	return 0;
		1089	}
		1090
		1091	/*****************************************************************************
		1092	*
		1093	* headers and interface
		1094	*
		1095	****************************************************************************/
		1096
		1097	static int decode_seq_header(AVSContext *h)
		1098	{
		1099	int frame_rate_code;
		1100	int width, height;
		1101
		1102	h->profile = get_bits(&h->gb, 8);
		1103	h->level = get_bits(&h->gb, 8);
		1104	skip_bits1(&h->gb); //progressive sequence
		1105
		1106	width = get_bits(&h->gb, 14);
		1107	height = get_bits(&h->gb, 14);
		1108	if ((h->width \|\| h->height) && (h->width != width \|\| h->height != height)) {
		1109	avpriv_report_missing_feature(h->avctx,
		1110	"Width/height changing in CAVS");
		1111	return AVERROR_PATCHWELCOME;
		1112	}
		1113	if (width <= 0 \|\| height <= 0) {
		1114	av_log(h->avctx, AV_LOG_ERROR, "Dimensions invalid\n");
		1115	return AVERROR_INVALIDDATA;
		1116	}
		1117	h->width = width;
		1118	h->height = height;
		1119
		1120	skip_bits(&h->gb, 2); //chroma format
		1121	skip_bits(&h->gb, 3); //sample_precision
		1122	h->aspect_ratio = get_bits(&h->gb, 4);
		1123	frame_rate_code = get_bits(&h->gb, 4);
		1124	skip_bits(&h->gb, 18); //bit_rate_lower
		1125	skip_bits1(&h->gb); //marker_bit
		1126	skip_bits(&h->gb, 12); //bit_rate_upper
		1127	h->low_delay = get_bits1(&h->gb);
		1128	h->mb_width = (h->width + 15) >> 4;
		1129	h->mb_height = (h->height + 15) >> 4;
		1130	h->avctx->time_base.den = ff_mpeg12_frame_rate_tab[frame_rate_code].num;
		1131	h->avctx->time_base.num = ff_mpeg12_frame_rate_tab[frame_rate_code].den;
		1132	h->avctx->width = h->width;
		1133	h->avctx->height = h->height;
		1134	if (!h->top_qp)
		1135	ff_cavs_init_top_lines(h);
		1136	return 0;
		1137	}
		1138
		1139	static void cavs_flush(AVCodecContext * avctx)
		1140	{
		1141	AVSContext *h = avctx->priv_data;
		1142	h->got_keyframe = 0;
		1143	}
		1144
		1145	static int cavs_decode_frame(AVCodecContext avctx, void data, int *got_frame,
		1146	AVPacket *avpkt)
		1147	{
		1148	AVSContext *h = avctx->priv_data;
		1149	const uint8_t *buf = avpkt->data;
		1150	int buf_size = avpkt->size;
		1151	uint32_t stc = -1;
		1152	int input_size, ret;
		1153	const uint8_t *buf_end;
		1154	const uint8_t *buf_ptr;
		1155
		1156	if (buf_size == 0) {
		1157	if (!h->low_delay && h->DPB[0].f->data[0]) {
		1158	*got_frame = 1;
		1159	av_frame_move_ref(data, h->DPB[0].f);
		1160	}
		1161	return 0;
		1162	}
		1163
		1164	buf_ptr = buf;
		1165	buf_end = buf + buf_size;
		1166	for(;;) {
		1167	buf_ptr = avpriv_find_start_code(buf_ptr, buf_end, &stc);
		1168	if ((stc & 0xFFFFFE00) \|\| buf_ptr == buf_end)
		1169	return FFMAX(0, buf_ptr - buf);
		1170	input_size = (buf_end - buf_ptr) * 8;
		1171	switch (stc) {
		1172	case CAVS_START_CODE:
		1173	init_get_bits(&h->gb, buf_ptr, input_size);
		1174	decode_seq_header(h);
		1175	break;
		1176	case PIC_I_START_CODE:
		1177	if (!h->got_keyframe) {
		1178	av_frame_unref(h->DPB[0].f);
		1179	av_frame_unref(h->DPB[1].f);
		1180	h->got_keyframe = 1;
		1181	}
		1182	case PIC_PB_START_CODE:
		1183	*got_frame = 0;
		1184	if (!h->got_keyframe)
		1185	break;
		1186	init_get_bits(&h->gb, buf_ptr, input_size);
		1187	h->stc = stc;
		1188	if (decode_pic(h))
		1189	break;
		1190	*got_frame = 1;
		1191	if (h->cur.f->pict_type != AV_PICTURE_TYPE_B) {
		1192	if (h->DPB[1].f->data[0]) {
		1193	if ((ret = av_frame_ref(data, h->DPB[1].f)) < 0)
		1194	return ret;
		1195	} else {
		1196	*got_frame = 0;
		1197	}
		1198	} else {
		1199	av_frame_move_ref(data, h->cur.f);
		1200	}
		1201	break;
		1202	case EXT_START_CODE:
		1203	//mpeg_decode_extension(avctx, buf_ptr, input_size);
		1204	break;
		1205	case USER_START_CODE:
		1206	//mpeg_decode_user_data(avctx, buf_ptr, input_size);
		1207	break;
		1208	default:
		1209	if (stc <= SLICE_MAX_START_CODE) {
		1210	init_get_bits(&h->gb, buf_ptr, input_size);
		1211	decode_slice_header(h, &h->gb);
		1212	}
		1213	break;
		1214	}
		1215	}
		1216	}
		1217
		1218	AVCodec ff_cavs_decoder = {
		1219	.name = "cavs",
		1220	.long_name = NULL_IF_CONFIG_SMALL("Chinese AVS (Audio Video Standard) (AVS1-P2, JiZhun profile)"),
		1221	.type = AVMEDIA_TYPE_VIDEO,
		1222	.id = AV_CODEC_ID_CAVS,
		1223	.priv_data_size = sizeof(AVSContext),
		1224	.init = ff_cavs_init,
		1225	.close = ff_cavs_end,
		1226	.decode = cavs_decode_frame,
		1227	.capabilities = CODEC_CAP_DR1 \| CODEC_CAP_DELAY,
		1228	.flush = cavs_flush,
		1229	};

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(root)/contrib/sdk/sources/ffmpeg/libavcodec/cavsdec.c – Rev 4349