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https://git.ffmpeg.org/ffmpeg.git
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4978618b6b
Originally committed as revision 11185 to svn://svn.ffmpeg.org/ffmpeg/trunk
148 lines
4.1 KiB
C
148 lines
4.1 KiB
C
/*
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* RV30 decoder
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* Copyright (c) 2007 Konstantin Shishkov
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file rv30.c
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* RV30 decoder
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*/
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#include "avcodec.h"
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#include "dsputil.h"
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#include "mpegvideo.h"
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#include "golomb.h"
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#include "rv34.h"
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#include "rv30data.h"
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static int rv30_parse_slice_header(RV34DecContext *r, GetBitContext *gb, SliceInfo *si)
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{
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int mb_bits;
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int w = r->s.width, h = r->s.height;
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int mb_size;
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memset(si, 0, sizeof(SliceInfo));
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skip_bits(gb, 3);
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si->type = get_bits(gb, 2);
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if(si->type == 1) si->type = 0;
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if(get_bits1(gb))
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return -1;
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si->quant = get_bits(gb, 5);
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skip_bits1(gb);
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skip_bits(gb, 13); // timestamp
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skip_bits(gb, r->rpr);
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si->width = w;
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si->height = h;
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mb_size = ((w + 15) >> 4) * ((h + 15) >> 4);
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mb_bits = ff_rv34_get_start_offset(gb, mb_size);
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si->start = get_bits(gb, mb_bits);
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skip_bits1(gb);
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return 0;
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}
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/**
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* Decode 4x4 intra types array.
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*/
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static int rv30_decode_intra_types(RV34DecContext *r, GetBitContext *gb, int8_t *dst)
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{
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int i, j, k;
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for(i = 0; i < 4; i++, dst += r->s.b4_stride - 4){
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for(j = 0; j < 4; j+= 2){
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int code = svq3_get_ue_golomb(gb) << 1;
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if(code >= 81*2){
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av_log(r->s.avctx, AV_LOG_ERROR, "Incorrect intra prediction code\n");
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return -1;
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}
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for(k = 0; k < 2; k++){
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int A = dst[-r->s.b4_stride] + 1;
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int B = dst[-1] + 1;
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*dst++ = rv30_itype_from_context[A * 90 + B * 9 + rv30_itype_code[code + k]];
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if(dst[-1] == 9){
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av_log(r->s.avctx, AV_LOG_ERROR, "Incorrect intra prediction mode\n");
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return -1;
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}
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}
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}
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}
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return 0;
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}
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/**
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* Decode macroblock information.
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*/
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static int rv30_decode_mb_info(RV34DecContext *r)
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{
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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 };
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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 };
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MpegEncContext *s = &r->s;
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GetBitContext *gb = &s->gb;
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int code = svq3_get_ue_golomb(gb);
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if(code > 11){
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av_log(s->avctx, AV_LOG_ERROR, "Incorrect MB type code\n");
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return -1;
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}
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if(code > 5){
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av_log(s->avctx, AV_LOG_ERROR, "dquant needed\n");
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code -= 6;
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}
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if(s->pict_type != B_TYPE)
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return rv30_p_types[code];
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else
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return rv30_b_types[code];
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}
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/**
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* Initialize decoder.
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*/
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static int rv30_decode_init(AVCodecContext *avctx)
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{
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RV34DecContext *r = avctx->priv_data;
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r->rv30 = 1;
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ff_rv34_decode_init(avctx);
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if(avctx->extradata_size < 2){
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av_log(avctx, AV_LOG_ERROR, "Extradata is too small.\n");
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return -1;
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}
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r->rpr = (avctx->extradata[1] & 7) >> 1;
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r->rpr = FFMIN(r->rpr + 1, 3);
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r->parse_slice_header = rv30_parse_slice_header;
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r->decode_intra_types = rv30_decode_intra_types;
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r->decode_mb_info = rv30_decode_mb_info;
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r->luma_dc_quant_i = rv30_luma_dc_quant;
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r->luma_dc_quant_p = rv30_luma_dc_quant;
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return 0;
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}
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AVCodec rv30_decoder = {
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"rv30",
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CODEC_TYPE_VIDEO,
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CODEC_ID_RV30,
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sizeof(RV34DecContext),
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rv30_decode_init,
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NULL,
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ff_rv34_decode_end,
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ff_rv34_decode_frame,
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CODEC_CAP_DR1 | CODEC_CAP_DELAY,
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};
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