yading@10: /*
yading@10:  * RV30 decoder
yading@10:  * Copyright (c) 2007 Konstantin Shishkov
yading@10:  *
yading@10:  * This file is part of FFmpeg.
yading@10:  *
yading@10:  * FFmpeg is free software; you can redistribute it and/or
yading@10:  * modify it under the terms of the GNU Lesser General Public
yading@10:  * License as published by the Free Software Foundation; either
yading@10:  * version 2.1 of the License, or (at your option) any later version.
yading@10:  *
yading@10:  * FFmpeg is distributed in the hope that it will be useful,
yading@10:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
yading@10:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
yading@10:  * Lesser General Public License for more details.
yading@10:  *
yading@10:  * You should have received a copy of the GNU Lesser General Public
yading@10:  * License along with FFmpeg; if not, write to the Free Software
yading@10:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
yading@10:  */
yading@10: 
yading@10: /**
yading@10:  * @file
yading@10:  * RV30 decoder
yading@10:  */
yading@10: 
yading@10: #include "avcodec.h"
yading@10: #include "mpegvideo.h"
yading@10: #include "golomb.h"
yading@10: 
yading@10: #include "rv34.h"
yading@10: #include "rv30data.h"
yading@10: 
yading@10: 
yading@10: static int rv30_parse_slice_header(RV34DecContext *r, GetBitContext *gb, SliceInfo *si)
yading@10: {
yading@10:     int mb_bits;
yading@10:     int w = r->s.width, h = r->s.height;
yading@10:     int mb_size;
yading@10:     int rpr;
yading@10: 
yading@10:     memset(si, 0, sizeof(SliceInfo));
yading@10:     if(get_bits(gb, 3))
yading@10:         return -1;
yading@10:     si->type = get_bits(gb, 2);
yading@10:     if(si->type == 1) si->type = 0;
yading@10:     if(get_bits1(gb))
yading@10:         return -1;
yading@10:     si->quant = get_bits(gb, 5);
yading@10:     skip_bits1(gb);
yading@10:     si->pts = get_bits(gb, 13);
yading@10:     rpr = get_bits(gb, r->rpr);
yading@10:     if (r->s.avctx->extradata_size < 8 + rpr*2) {
yading@10:         av_log(r->s.avctx, AV_LOG_WARNING,
yading@10:                "Extradata does not contain selected resolution\n");
yading@10:         rpr = 0;
yading@10:     }
yading@10:     if(rpr){
yading@10:         w = r->s.avctx->extradata[6 + rpr*2] << 2;
yading@10:         h = r->s.avctx->extradata[7 + rpr*2] << 2;
yading@10:     }
yading@10:     si->width  = w;
yading@10:     si->height = h;
yading@10:     mb_size = ((w + 15) >> 4) * ((h + 15) >> 4);
yading@10:     mb_bits = ff_rv34_get_start_offset(gb, mb_size);
yading@10:     si->start = get_bits(gb, mb_bits);
yading@10:     skip_bits1(gb);
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: /**
yading@10:  * Decode 4x4 intra types array.
yading@10:  */
yading@10: static int rv30_decode_intra_types(RV34DecContext *r, GetBitContext *gb, int8_t *dst)
yading@10: {
yading@10:     int i, j, k;
yading@10: 
yading@10:     for(i = 0; i < 4; i++, dst += r->intra_types_stride - 4){
yading@10:         for(j = 0; j < 4; j+= 2){
yading@10:             unsigned code = svq3_get_ue_golomb(gb) << 1;
yading@10:             if (code > 80U*2U) {
yading@10:                 av_log(r->s.avctx, AV_LOG_ERROR, "Incorrect intra prediction code\n");
yading@10:                 return -1;
yading@10:             }
yading@10:             for(k = 0; k < 2; k++){
yading@10:                 int A = dst[-r->intra_types_stride] + 1;
yading@10:                 int B = dst[-1] + 1;
yading@10:                 *dst++ = rv30_itype_from_context[A * 90 + B * 9 + rv30_itype_code[code + k]];
yading@10:                 if(dst[-1] == 9){
yading@10:                     av_log(r->s.avctx, AV_LOG_ERROR, "Incorrect intra prediction mode\n");
yading@10:                     return -1;
yading@10:                 }
yading@10:             }
yading@10:         }
yading@10:     }
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: /**
yading@10:  * Decode macroblock information.
yading@10:  */
yading@10: static int rv30_decode_mb_info(RV34DecContext *r)
yading@10: {
yading@10:     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 };
yading@10:     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 };
yading@10:     MpegEncContext *s = &r->s;
yading@10:     GetBitContext *gb = &s->gb;
yading@10:     unsigned code     = svq3_get_ue_golomb(gb);
yading@10: 
yading@10:     if (code > 11) {
yading@10:         av_log(s->avctx, AV_LOG_ERROR, "Incorrect MB type code\n");
yading@10:         return -1;
yading@10:     }
yading@10:     if(code > 5){
yading@10:         av_log(s->avctx, AV_LOG_ERROR, "dquant needed\n");
yading@10:         code -= 6;
yading@10:     }
yading@10:     if(s->pict_type != AV_PICTURE_TYPE_B)
yading@10:         return rv30_p_types[code];
yading@10:     else
yading@10:         return rv30_b_types[code];
yading@10: }
yading@10: 
yading@10: static inline void rv30_weak_loop_filter(uint8_t *src, const int step,
yading@10:                                          const int stride, const int lim)
yading@10: {
yading@10:     const uint8_t *cm = ff_cropTbl + MAX_NEG_CROP;
yading@10:     int i, diff;
yading@10: 
yading@10:     for(i = 0; i < 4; i++){
yading@10:         diff = ((src[-2*step] - src[1*step]) - (src[-1*step] - src[0*step])*4) >> 3;
yading@10:         diff = av_clip(diff, -lim, lim);
yading@10:         src[-1*step] = cm[src[-1*step] + diff];
yading@10:         src[ 0*step] = cm[src[ 0*step] - diff];
yading@10:         src += stride;
yading@10:     }
yading@10: }
yading@10: 
yading@10: static void rv30_loop_filter(RV34DecContext *r, int row)
yading@10: {
yading@10:     MpegEncContext *s = &r->s;
yading@10:     int mb_pos, mb_x;
yading@10:     int i, j, k;
yading@10:     uint8_t *Y, *C;
yading@10:     int loc_lim, cur_lim, left_lim = 0, top_lim = 0;
yading@10: 
yading@10:     mb_pos = row * s->mb_stride;
yading@10:     for(mb_x = 0; mb_x < s->mb_width; mb_x++, mb_pos++){
yading@10:         int mbtype = s->current_picture_ptr->mb_type[mb_pos];
yading@10:         if(IS_INTRA(mbtype) || IS_SEPARATE_DC(mbtype))
yading@10:             r->deblock_coefs[mb_pos] = 0xFFFF;
yading@10:         if(IS_INTRA(mbtype))
yading@10:             r->cbp_chroma[mb_pos] = 0xFF;
yading@10:     }
yading@10: 
yading@10:     /* all vertical edges are filtered first
yading@10:      * and horizontal edges are filtered on the next iteration
yading@10:      */
yading@10:     mb_pos = row * s->mb_stride;
yading@10:     for(mb_x = 0; mb_x < s->mb_width; mb_x++, mb_pos++){
yading@10:         cur_lim = rv30_loop_filt_lim[s->current_picture_ptr->qscale_table[mb_pos]];
yading@10:         if(mb_x)
yading@10:             left_lim = rv30_loop_filt_lim[s->current_picture_ptr->qscale_table[mb_pos - 1]];
yading@10:         for(j = 0; j < 16; j += 4){
yading@10:             Y = s->current_picture_ptr->f.data[0] + mb_x*16 + (row*16 + j) * s->linesize + 4 * !mb_x;
yading@10:             for(i = !mb_x; i < 4; i++, Y += 4){
yading@10:                 int ij = i + j;
yading@10:                 loc_lim = 0;
yading@10:                 if(r->deblock_coefs[mb_pos] & (1 << ij))
yading@10:                     loc_lim = cur_lim;
yading@10:                 else if(!i && r->deblock_coefs[mb_pos - 1] & (1 << (ij + 3)))
yading@10:                     loc_lim = left_lim;
yading@10:                 else if( i && r->deblock_coefs[mb_pos]     & (1 << (ij - 1)))
yading@10:                     loc_lim = cur_lim;
yading@10:                 if(loc_lim)
yading@10:                     rv30_weak_loop_filter(Y, 1, s->linesize, loc_lim);
yading@10:             }
yading@10:         }
yading@10:         for(k = 0; k < 2; k++){
yading@10:             int cur_cbp, left_cbp = 0;
yading@10:             cur_cbp = (r->cbp_chroma[mb_pos] >> (k*4)) & 0xF;
yading@10:             if(mb_x)
yading@10:                 left_cbp = (r->cbp_chroma[mb_pos - 1] >> (k*4)) & 0xF;
yading@10:             for(j = 0; j < 8; j += 4){
yading@10:                 C = s->current_picture_ptr->f.data[k + 1] + mb_x*8 + (row*8 + j) * s->uvlinesize + 4 * !mb_x;
yading@10:                 for(i = !mb_x; i < 2; i++, C += 4){
yading@10:                     int ij = i + (j >> 1);
yading@10:                     loc_lim = 0;
yading@10:                     if (cur_cbp & (1 << ij))
yading@10:                         loc_lim = cur_lim;
yading@10:                     else if(!i && left_cbp & (1 << (ij + 1)))
yading@10:                         loc_lim = left_lim;
yading@10:                     else if( i && cur_cbp  & (1 << (ij - 1)))
yading@10:                         loc_lim = cur_lim;
yading@10:                     if(loc_lim)
yading@10:                         rv30_weak_loop_filter(C, 1, s->uvlinesize, loc_lim);
yading@10:                 }
yading@10:             }
yading@10:         }
yading@10:     }
yading@10:     mb_pos = row * s->mb_stride;
yading@10:     for(mb_x = 0; mb_x < s->mb_width; mb_x++, mb_pos++){
yading@10:         cur_lim = rv30_loop_filt_lim[s->current_picture_ptr->qscale_table[mb_pos]];
yading@10:         if(row)
yading@10:             top_lim = rv30_loop_filt_lim[s->current_picture_ptr->qscale_table[mb_pos - s->mb_stride]];
yading@10:         for(j = 4*!row; j < 16; j += 4){
yading@10:             Y = s->current_picture_ptr->f.data[0] + mb_x*16 + (row*16 + j) * s->linesize;
yading@10:             for(i = 0; i < 4; i++, Y += 4){
yading@10:                 int ij = i + j;
yading@10:                 loc_lim = 0;
yading@10:                 if(r->deblock_coefs[mb_pos] & (1 << ij))
yading@10:                     loc_lim = cur_lim;
yading@10:                 else if(!j && r->deblock_coefs[mb_pos - s->mb_stride] & (1 << (ij + 12)))
yading@10:                     loc_lim = top_lim;
yading@10:                 else if( j && r->deblock_coefs[mb_pos]                & (1 << (ij - 4)))
yading@10:                     loc_lim = cur_lim;
yading@10:                 if(loc_lim)
yading@10:                     rv30_weak_loop_filter(Y, s->linesize, 1, loc_lim);
yading@10:             }
yading@10:         }
yading@10:         for(k = 0; k < 2; k++){
yading@10:             int cur_cbp, top_cbp = 0;
yading@10:             cur_cbp = (r->cbp_chroma[mb_pos] >> (k*4)) & 0xF;
yading@10:             if(row)
yading@10:                 top_cbp = (r->cbp_chroma[mb_pos - s->mb_stride] >> (k*4)) & 0xF;
yading@10:             for(j = 4*!row; j < 8; j += 4){
yading@10:                 C = s->current_picture_ptr->f.data[k+1] + mb_x*8 + (row*8 + j) * s->uvlinesize;
yading@10:                 for(i = 0; i < 2; i++, C += 4){
yading@10:                     int ij = i + (j >> 1);
yading@10:                     loc_lim = 0;
yading@10:                     if (r->cbp_chroma[mb_pos] & (1 << ij))
yading@10:                         loc_lim = cur_lim;
yading@10:                     else if(!j && top_cbp & (1 << (ij + 2)))
yading@10:                         loc_lim = top_lim;
yading@10:                     else if( j && cur_cbp & (1 << (ij - 2)))
yading@10:                         loc_lim = cur_lim;
yading@10:                     if(loc_lim)
yading@10:                         rv30_weak_loop_filter(C, s->uvlinesize, 1, loc_lim);
yading@10:                 }
yading@10:             }
yading@10:         }
yading@10:     }
yading@10: }
yading@10: 
yading@10: /**
yading@10:  * Initialize decoder.
yading@10:  */
yading@10: static av_cold int rv30_decode_init(AVCodecContext *avctx)
yading@10: {
yading@10:     RV34DecContext *r = avctx->priv_data;
yading@10: 
yading@10:     r->rv30 = 1;
yading@10:     ff_rv34_decode_init(avctx);
yading@10:     if(avctx->extradata_size < 2){
yading@10:         av_log(avctx, AV_LOG_ERROR, "Extradata is too small.\n");
yading@10:         return -1;
yading@10:     }
yading@10:     r->rpr = (avctx->extradata[1] & 7) >> 1;
yading@10:     r->rpr = FFMIN(r->rpr + 1, 3);
yading@10:     if(avctx->extradata_size - 8 < (r->rpr - 1) * 2){
yading@10:         av_log(avctx, AV_LOG_ERROR, "Insufficient extradata - need at least %d bytes, got %d\n",
yading@10:                6 + r->rpr * 2, avctx->extradata_size);
yading@10:     }
yading@10:     r->parse_slice_header = rv30_parse_slice_header;
yading@10:     r->decode_intra_types = rv30_decode_intra_types;
yading@10:     r->decode_mb_info     = rv30_decode_mb_info;
yading@10:     r->loop_filter        = rv30_loop_filter;
yading@10:     r->luma_dc_quant_i = rv30_luma_dc_quant;
yading@10:     r->luma_dc_quant_p = rv30_luma_dc_quant;
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: AVCodec ff_rv30_decoder = {
yading@10:     .name                  = "rv30",
yading@10:     .type                  = AVMEDIA_TYPE_VIDEO,
yading@10:     .id                    = AV_CODEC_ID_RV30,
yading@10:     .priv_data_size        = sizeof(RV34DecContext),
yading@10:     .init                  = rv30_decode_init,
yading@10:     .close                 = ff_rv34_decode_end,
yading@10:     .decode                = ff_rv34_decode_frame,
yading@10:     .capabilities          = CODEC_CAP_DR1 | CODEC_CAP_DELAY |
yading@10:                              CODEC_CAP_FRAME_THREADS,
yading@10:     .flush                 = ff_mpeg_flush,
yading@10:     .long_name             = NULL_IF_CONFIG_SMALL("RealVideo 3.0"),
yading@10:     .pix_fmts              = ff_pixfmt_list_420,
yading@10:     .init_thread_copy      = ONLY_IF_THREADS_ENABLED(ff_rv34_decode_init_thread_copy),
yading@10:     .update_thread_context = ONLY_IF_THREADS_ENABLED(ff_rv34_decode_update_thread_context),
yading@10: };