[FFmpeg-cvslog] r11130 - trunk/libavcodec/rv30.c
kostya
subversion
Sun Dec 2 19:44:29 CET 2007
Author: kostya
Date: Sun Dec 2 19:44:29 2007
New Revision: 11130
Log:
RealVideo 3 decoder functions
Added:
trunk/libavcodec/rv30.c
Added: trunk/libavcodec/rv30.c
==============================================================================
--- (empty file)
+++ trunk/libavcodec/rv30.c Sun Dec 2 19:44:29 2007
@@ -0,0 +1,145 @@
+/*
+ * RV30 decoder
+ * Copyright (c) 2007 Konstantin Shishkov
+ *
+ * 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 rv30.c
+ * RV30 decoder.
+ */
+
+#include "avcodec.h"
+#include "dsputil.h"
+#include "mpegvideo.h"
+
+#include "rv34.h"
+#include "rv30data.h"
+
+
+static int rv30_parse_slice_header(RV34DecContext *r, GetBitContext *gb, SliceInfo *si)
+{
+ int mb_bits;
+ int w = r->s.width, h = r->s.height;
+ int mb_size;
+
+ memset(si, 0, sizeof(SliceInfo));
+ skip_bits(gb, 3);
+ si->type = get_bits(gb, 2);
+ if(si->type == 1) si->type = 0;
+ if(get_bits1(gb))
+ return -1;
+ si->quant = get_bits(gb, 5);
+ skip_bits1(gb);
+ skip_bits(gb, 13); // timestamp
+ skip_bits(gb, r->rpr);
+ si->width = w;
+ si->height = h;
+ mb_size = ((w + 15) >> 4) * ((h + 15) >> 4);
+ mb_bits = ff_rv34_get_start_offset(gb, mb_size);
+ si->start = get_bits(gb, mb_bits);
+ skip_bits1(gb);
+ return 0;
+}
+
+/**
+ * Decode 4x4 intra types array
+ */
+static int rv30_decode_intra_types(RV34DecContext *r, GetBitContext *gb, int *dst)
+{
+ int i, j, k;
+
+ for(i = 0; i < 4; i++, dst += r->s.b4_stride - 4){
+ for(j = 0; j < 4; j+= 2){
+ int code = (ff_rv34_get_gamma(gb) - 1) << 1;
+ if(code >= 81*2){
+ av_log(r->s.avctx, AV_LOG_ERROR, "Incorrect intra prediction code\n");
+ return -1;
+ }
+ for(k = 0; k < 2; k++){
+ int A = dst[-r->s.b4_stride] + 1;
+ int B = dst[-1] + 1;
+ *dst++ = rv30_itype_from_context[A * 90 + B * 9 + rv30_itype_code[code + k]];
+ if(dst[-1] == 9){
+ av_log(r->s.avctx, AV_LOG_ERROR, "Incorrect intra prediction mode\n");
+ return -1;
+ }
+ }
+ }
+ }
+ return 0;
+}
+
+/**
+ * Decode macroblock information
+ */
+static int rv30_decode_mb_info(RV34DecContext *r)
+{
+ 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 };
+ 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 };
+ MpegEncContext *s = &r->s;
+ GetBitContext *gb = &s->gb;
+ int code = ff_rv34_get_gamma(gb) - 1;
+
+ if(code > 11){
+ av_log(s->avctx, AV_LOG_ERROR, "Incorrect MB type code\n");
+ return -1;
+ }
+ if(code > 5){
+ av_log(s->avctx, AV_LOG_ERROR, "dquant needed\n");
+ code -= 6;
+ }
+ if(s->pict_type != B_TYPE)
+ return rv30_p_types[code];
+ else
+ return rv30_b_types[code];
+}
+
+/**
+ * Initialize decoder
+ */
+static int rv30_decode_init(AVCodecContext *avctx)
+{
+ RV34DecContext *r = avctx->priv_data;
+
+ r->rv30 = 1;
+ ff_rv34_decode_init(avctx);
+ if(avctx->extradata_size < 2){
+ av_log(avctx, AV_LOG_ERROR, "Extradata is too small\n");
+ return -1;
+ }
+ r->rpr = (avctx->extradata[1] & 7) >> 1;
+ r->rpr = FFMIN(r->rpr + 1, 3);
+ r->parse_slice_header = rv30_parse_slice_header;
+ r->decode_intra_types = rv30_decode_intra_types;
+ r->decode_mb_info = rv30_decode_mb_info;
+ r->luma_dc_quant_i = rv30_luma_dc_quant;
+ r->luma_dc_quant_p = rv30_luma_dc_quant;
+ return 0;
+}
+
+AVCodec rv30_decoder = {
+ "rv30",
+ CODEC_TYPE_VIDEO,
+ CODEC_ID_RV30,
+ sizeof(RV34DecContext),
+ rv30_decode_init,
+ NULL,
+ ff_rv34_decode_end,
+ ff_rv34_decode_frame,
+};
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