Merge branch 'master' of http://repo.or.cz/r/FFMpeg-mirror
[FFMpeg-mirror/DVCPRO-HD.git] / libavcodec / rv30.c
blob2cd12bc296289b851ffca3591b6e551e6abcbf61
1 /*
2 * RV30 decoder
3 * Copyright (c) 2007 Konstantin Shishkov
5 * This file is part of FFmpeg.
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.
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.
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
22 /**
23 * @file rv30.c
24 * RV30 decoder
27 #include "avcodec.h"
28 #include "dsputil.h"
29 #include "mpegvideo.h"
30 #include "golomb.h"
32 #include "rv34.h"
33 #include "rv30data.h"
36 static int rv30_parse_slice_header(RV34DecContext *r, GetBitContext *gb, SliceInfo *si)
38 int mb_bits;
39 int w = r->s.width, h = r->s.height;
40 int mb_size;
42 memset(si, 0, sizeof(SliceInfo));
43 skip_bits(gb, 3);
44 si->type = get_bits(gb, 2);
45 if(si->type == 1) si->type = 0;
46 if(get_bits1(gb))
47 return -1;
48 si->quant = get_bits(gb, 5);
49 skip_bits1(gb);
50 si->pts = get_bits(gb, 13);
51 skip_bits(gb, r->rpr);
52 si->width = w;
53 si->height = h;
54 mb_size = ((w + 15) >> 4) * ((h + 15) >> 4);
55 mb_bits = ff_rv34_get_start_offset(gb, mb_size);
56 si->start = get_bits(gb, mb_bits);
57 skip_bits1(gb);
58 return 0;
61 /**
62 * Decode 4x4 intra types array.
64 static int rv30_decode_intra_types(RV34DecContext *r, GetBitContext *gb, int8_t *dst)
66 int i, j, k;
68 for(i = 0; i < 4; i++, dst += r->s.b4_stride - 4){
69 for(j = 0; j < 4; j+= 2){
70 int code = svq3_get_ue_golomb(gb) << 1;
71 if(code >= 81*2){
72 av_log(r->s.avctx, AV_LOG_ERROR, "Incorrect intra prediction code\n");
73 return -1;
75 for(k = 0; k < 2; k++){
76 int A = dst[-r->s.b4_stride] + 1;
77 int B = dst[-1] + 1;
78 *dst++ = rv30_itype_from_context[A * 90 + B * 9 + rv30_itype_code[code + k]];
79 if(dst[-1] == 9){
80 av_log(r->s.avctx, AV_LOG_ERROR, "Incorrect intra prediction mode\n");
81 return -1;
86 return 0;
89 /**
90 * Decode macroblock information.
92 static int rv30_decode_mb_info(RV34DecContext *r)
94 static const int rv30_p_types[6] = { RV34_MB_SKIP, RV34_MB_P_16x16, RV34_MB_P_8x8, -1, RV34_MB_TYPE_INTRA, RV34_MB_TYPE_INTRA16x16 };
95 static const int rv30_b_types[6] = { RV34_MB_SKIP, RV34_MB_B_DIRECT, RV34_MB_B_FORWARD, RV34_MB_B_BACKWARD, RV34_MB_TYPE_INTRA, RV34_MB_TYPE_INTRA16x16 };
96 MpegEncContext *s = &r->s;
97 GetBitContext *gb = &s->gb;
98 int code = svq3_get_ue_golomb(gb);
100 if(code > 11){
101 av_log(s->avctx, AV_LOG_ERROR, "Incorrect MB type code\n");
102 return -1;
104 if(code > 5){
105 av_log(s->avctx, AV_LOG_ERROR, "dquant needed\n");
106 code -= 6;
108 if(s->pict_type != FF_B_TYPE)
109 return rv30_p_types[code];
110 else
111 return rv30_b_types[code];
115 * Initialize decoder.
117 static av_cold int rv30_decode_init(AVCodecContext *avctx)
119 RV34DecContext *r = avctx->priv_data;
121 r->rv30 = 1;
122 ff_rv34_decode_init(avctx);
123 if(avctx->extradata_size < 2){
124 av_log(avctx, AV_LOG_ERROR, "Extradata is too small.\n");
125 return -1;
127 r->rpr = (avctx->extradata[1] & 7) >> 1;
128 r->rpr = FFMIN(r->rpr + 1, 3);
129 r->parse_slice_header = rv30_parse_slice_header;
130 r->decode_intra_types = rv30_decode_intra_types;
131 r->decode_mb_info = rv30_decode_mb_info;
132 r->luma_dc_quant_i = rv30_luma_dc_quant;
133 r->luma_dc_quant_p = rv30_luma_dc_quant;
134 return 0;
137 AVCodec rv30_decoder = {
138 "rv30",
139 CODEC_TYPE_VIDEO,
140 CODEC_ID_RV30,
141 sizeof(RV34DecContext),
142 rv30_decode_init,
143 NULL,
144 ff_rv34_decode_end,
145 ff_rv34_decode_frame,
146 CODEC_CAP_DR1 | CODEC_CAP_DELAY,
147 .long_name = NULL_IF_CONFIG_SMALL("RealVideo 3.0"),