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
29 #include "mpegvideo.h"
36 static int rv30_parse_slice_header(RV34DecContext *r, GetBitContext *gb, SliceInfo *si)
39 int w = r->s.width, h = r->s.height;
42 memset(si, 0, sizeof(SliceInfo));
45 si->type = get_bits(gb, 2);
46 if(si->type == 1) si->type = 0;
49 si->quant = get_bits(gb, 5);
51 si->pts = get_bits(gb, 13);
52 skip_bits(gb, r->rpr);
55 mb_size = ((w + 15) >> 4) * ((h + 15) >> 4);
56 mb_bits = ff_rv34_get_start_offset(gb, mb_size);
57 si->start = get_bits(gb, mb_bits);
63 * Decode 4x4 intra types array.
65 static int rv30_decode_intra_types(RV34DecContext *r, GetBitContext *gb, int8_t *dst)
69 for(i = 0; i < 4; i++, dst += r->s.b4_stride - 4){
70 for(j = 0; j < 4; j+= 2){
71 int code = svq3_get_ue_golomb(gb) << 1;
73 av_log(r->s.avctx, AV_LOG_ERROR, "Incorrect intra prediction code\n");
76 for(k = 0; k < 2; k++){
77 int A = dst[-r->s.b4_stride] + 1;
79 *dst++ = rv30_itype_from_context[A * 90 + B * 9 + rv30_itype_code[code + k]];
81 av_log(r->s.avctx, AV_LOG_ERROR, "Incorrect intra prediction mode\n");
91 * Decode macroblock information.
93 static int rv30_decode_mb_info(RV34DecContext *r)
95 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 };
96 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 };
97 MpegEncContext *s = &r->s;
98 GetBitContext *gb = &s->gb;
99 int code = svq3_get_ue_golomb(gb);
102 av_log(s->avctx, AV_LOG_ERROR, "Incorrect MB type code\n");
106 av_log(s->avctx, AV_LOG_ERROR, "dquant needed\n");
109 if(s->pict_type != FF_B_TYPE)
110 return rv30_p_types[code];
112 return rv30_b_types[code];
116 * Initialize decoder.
118 static av_cold int rv30_decode_init(AVCodecContext *avctx)
120 RV34DecContext *r = avctx->priv_data;
123 ff_rv34_decode_init(avctx);
124 if(avctx->extradata_size < 2){
125 av_log(avctx, AV_LOG_ERROR, "Extradata is too small.\n");
128 r->rpr = (avctx->extradata[1] & 7) >> 1;
129 r->rpr = FFMIN(r->rpr + 1, 3);
130 r->parse_slice_header = rv30_parse_slice_header;
131 r->decode_intra_types = rv30_decode_intra_types;
132 r->decode_mb_info = rv30_decode_mb_info;
133 r->luma_dc_quant_i = rv30_luma_dc_quant;
134 r->luma_dc_quant_p = rv30_luma_dc_quant;
138 AVCodec rv30_decoder = {
142 sizeof(RV34DecContext),
146 ff_rv34_decode_frame,
147 CODEC_CAP_DR1 | CODEC_CAP_DELAY,
148 .long_name = NULL_IF_CONFIG_SMALL("RealVideo 3.0"),