725 lines
25 KiB
C
725 lines
25 KiB
C
/*
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* Chinese AVS video (AVS1-P2, JiZhun profile) decoder.
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* Copyright (c) 2006 Stefan Gehrer <stefan.gehrer@gmx.de>
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*
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* This file is part of Libav.
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*
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* Libav 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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* Libav 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 Libav; 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
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* Chinese AVS video (AVS1-P2, JiZhun profile) decoder
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* @author Stefan Gehrer <stefan.gehrer@gmx.de>
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*/
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#include "avcodec.h"
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#include "get_bits.h"
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#include "golomb.h"
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#include "cavs.h"
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static const uint8_t mv_scan[4] = {
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MV_FWD_X0,MV_FWD_X1,
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MV_FWD_X2,MV_FWD_X3
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};
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static const uint8_t cbp_tab[64][2] = {
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{63, 0},{15,15},{31,63},{47,31},{ 0,16},{14,32},{13,47},{11,13},
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{ 7,14},{ 5,11},{10,12},{ 8, 5},{12,10},{61, 7},{ 4,48},{55, 3},
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{ 1, 2},{ 2, 8},{59, 4},{ 3, 1},{62,61},{ 9,55},{ 6,59},{29,62},
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{45,29},{51,27},{23,23},{39,19},{27,30},{46,28},{53, 9},{30, 6},
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{43,60},{37,21},{60,44},{16,26},{21,51},{28,35},{19,18},{35,20},
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{42,24},{26,53},{44,17},{32,37},{58,39},{24,45},{20,58},{17,43},
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{18,42},{48,46},{22,36},{33,33},{25,34},{49,40},{40,52},{36,49},
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{34,50},{50,56},{52,25},{54,22},{41,54},{56,57},{38,41},{57,38}
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};
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/*****************************************************************************
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*
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* motion vector prediction
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*
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****************************************************************************/
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static inline void store_mvs(AVSContext *h) {
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h->col_mv[h->mbidx*4 + 0] = h->mv[MV_FWD_X0];
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h->col_mv[h->mbidx*4 + 1] = h->mv[MV_FWD_X1];
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h->col_mv[h->mbidx*4 + 2] = h->mv[MV_FWD_X2];
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h->col_mv[h->mbidx*4 + 3] = h->mv[MV_FWD_X3];
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}
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static inline void mv_pred_direct(AVSContext *h, cavs_vector *pmv_fw,
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cavs_vector *col_mv) {
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cavs_vector *pmv_bw = pmv_fw + MV_BWD_OFFS;
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int den = h->direct_den[col_mv->ref];
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int m = col_mv->x >> 31;
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pmv_fw->dist = h->dist[1];
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pmv_bw->dist = h->dist[0];
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pmv_fw->ref = 1;
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pmv_bw->ref = 0;
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/* scale the co-located motion vector according to its temporal span */
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pmv_fw->x = (((den+(den*col_mv->x*pmv_fw->dist^m)-m-1)>>14)^m)-m;
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pmv_bw->x = m-(((den+(den*col_mv->x*pmv_bw->dist^m)-m-1)>>14)^m);
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m = col_mv->y >> 31;
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pmv_fw->y = (((den+(den*col_mv->y*pmv_fw->dist^m)-m-1)>>14)^m)-m;
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pmv_bw->y = m-(((den+(den*col_mv->y*pmv_bw->dist^m)-m-1)>>14)^m);
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}
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static inline void mv_pred_sym(AVSContext *h, cavs_vector *src, enum cavs_block size) {
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cavs_vector *dst = src + MV_BWD_OFFS;
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/* backward mv is the scaled and negated forward mv */
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dst->x = -((src->x * h->sym_factor + 256) >> 9);
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dst->y = -((src->y * h->sym_factor + 256) >> 9);
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dst->ref = 0;
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dst->dist = h->dist[0];
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set_mvs(dst, size);
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}
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/*****************************************************************************
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*
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* residual data decoding
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*
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****************************************************************************/
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/** kth-order exponential golomb code */
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static inline int get_ue_code(GetBitContext *gb, int order) {
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if(order) {
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int ret = get_ue_golomb(gb) << order;
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return ret + get_bits(gb,order);
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}
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return get_ue_golomb(gb);
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}
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/**
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* decode coefficients from one 8x8 block, dequantize, inverse transform
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* and add them to sample block
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* @param r pointer to 2D VLC table
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* @param esc_golomb_order escape codes are k-golomb with this order k
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* @param qp quantizer
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* @param dst location of sample block
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* @param stride line stride in frame buffer
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*/
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static int decode_residual_block(AVSContext *h, GetBitContext *gb,
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const struct dec_2dvlc *r, int esc_golomb_order,
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int qp, uint8_t *dst, int stride) {
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int i, level_code, esc_code, level, run, mask;
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DCTELEM level_buf[65];
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uint8_t run_buf[65];
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DCTELEM *block = h->block;
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for(i=0;i<65;i++) {
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level_code = get_ue_code(gb,r->golomb_order);
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if(level_code >= ESCAPE_CODE) {
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run = ((level_code - ESCAPE_CODE) >> 1) + 1;
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esc_code = get_ue_code(gb,esc_golomb_order);
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level = esc_code + (run > r->max_run ? 1 : r->level_add[run]);
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while(level > r->inc_limit)
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r++;
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mask = -(level_code & 1);
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level = (level^mask) - mask;
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} else {
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level = r->rltab[level_code][0];
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if(!level) //end of block signal
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break;
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run = r->rltab[level_code][1];
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r += r->rltab[level_code][2];
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}
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level_buf[i] = level;
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run_buf[i] = run;
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}
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if(dequant(h,level_buf, run_buf, block, ff_cavs_dequant_mul[qp],
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ff_cavs_dequant_shift[qp], i))
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return -1;
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h->cdsp.cavs_idct8_add(dst,block,stride);
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h->s.dsp.clear_block(block);
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return 0;
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}
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static inline void decode_residual_chroma(AVSContext *h) {
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if(h->cbp & (1<<4))
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decode_residual_block(h,&h->s.gb,ff_cavs_chroma_dec,0,
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ff_cavs_chroma_qp[h->qp],h->cu,h->c_stride);
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if(h->cbp & (1<<5))
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decode_residual_block(h,&h->s.gb,ff_cavs_chroma_dec,0,
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ff_cavs_chroma_qp[h->qp],h->cv,h->c_stride);
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}
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static inline int decode_residual_inter(AVSContext *h) {
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int block;
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/* get coded block pattern */
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int cbp= get_ue_golomb(&h->s.gb);
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if(cbp > 63){
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av_log(h->s.avctx, AV_LOG_ERROR, "illegal inter cbp\n");
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return -1;
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}
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h->cbp = cbp_tab[cbp][1];
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/* get quantizer */
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if(h->cbp && !h->qp_fixed)
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h->qp = (h->qp + get_se_golomb(&h->s.gb)) & 63;
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for(block=0;block<4;block++)
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if(h->cbp & (1<<block))
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decode_residual_block(h,&h->s.gb,ff_cavs_inter_dec,0,h->qp,
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h->cy + h->luma_scan[block], h->l_stride);
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decode_residual_chroma(h);
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return 0;
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}
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/*****************************************************************************
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*
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* macroblock level
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*
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****************************************************************************/
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static int decode_mb_i(AVSContext *h, int cbp_code) {
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GetBitContext *gb = &h->s.gb;
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int block, pred_mode_uv;
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uint8_t top[18];
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uint8_t *left = NULL;
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uint8_t *d;
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ff_cavs_init_mb(h);
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/* get intra prediction modes from stream */
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for(block=0;block<4;block++) {
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int nA,nB,predpred;
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int pos = ff_cavs_scan3x3[block];
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nA = h->pred_mode_Y[pos-1];
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nB = h->pred_mode_Y[pos-3];
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predpred = FFMIN(nA,nB);
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if(predpred == NOT_AVAIL) // if either is not available
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predpred = INTRA_L_LP;
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if(!get_bits1(gb)){
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int rem_mode= get_bits(gb, 2);
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predpred = rem_mode + (rem_mode >= predpred);
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}
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h->pred_mode_Y[pos] = predpred;
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}
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pred_mode_uv = get_ue_golomb(gb);
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if(pred_mode_uv > 6) {
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av_log(h->s.avctx, AV_LOG_ERROR, "illegal intra chroma pred mode\n");
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return -1;
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}
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ff_cavs_modify_mb_i(h, &pred_mode_uv);
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/* get coded block pattern */
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if(h->pic_type == FF_I_TYPE)
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cbp_code = get_ue_golomb(gb);
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if(cbp_code > 63){
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av_log(h->s.avctx, AV_LOG_ERROR, "illegal intra cbp\n");
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return -1;
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}
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h->cbp = cbp_tab[cbp_code][0];
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if(h->cbp && !h->qp_fixed)
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h->qp = (h->qp + get_se_golomb(gb)) & 63; //qp_delta
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/* luma intra prediction interleaved with residual decode/transform/add */
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for(block=0;block<4;block++) {
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d = h->cy + h->luma_scan[block];
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ff_cavs_load_intra_pred_luma(h, top, &left, block);
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h->intra_pred_l[h->pred_mode_Y[ff_cavs_scan3x3[block]]]
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(d, top, left, h->l_stride);
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if(h->cbp & (1<<block))
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decode_residual_block(h,gb,ff_cavs_intra_dec,1,h->qp,d,h->l_stride);
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}
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/* chroma intra prediction */
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ff_cavs_load_intra_pred_chroma(h);
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h->intra_pred_c[pred_mode_uv](h->cu, &h->top_border_u[h->mbx*10],
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h->left_border_u, h->c_stride);
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h->intra_pred_c[pred_mode_uv](h->cv, &h->top_border_v[h->mbx*10],
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h->left_border_v, h->c_stride);
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decode_residual_chroma(h);
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ff_cavs_filter(h,I_8X8);
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set_mv_intra(h);
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return 0;
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}
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static void decode_mb_p(AVSContext *h, enum cavs_mb mb_type) {
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GetBitContext *gb = &h->s.gb;
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int ref[4];
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ff_cavs_init_mb(h);
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switch(mb_type) {
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case P_SKIP:
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ff_cavs_mv(h, MV_FWD_X0, MV_FWD_C2, MV_PRED_PSKIP, BLK_16X16, 0);
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break;
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case P_16X16:
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ref[0] = h->ref_flag ? 0 : get_bits1(gb);
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ff_cavs_mv(h, MV_FWD_X0, MV_FWD_C2, MV_PRED_MEDIAN, BLK_16X16,ref[0]);
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break;
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case P_16X8:
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ref[0] = h->ref_flag ? 0 : get_bits1(gb);
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ref[2] = h->ref_flag ? 0 : get_bits1(gb);
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ff_cavs_mv(h, MV_FWD_X0, MV_FWD_C2, MV_PRED_TOP, BLK_16X8, ref[0]);
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ff_cavs_mv(h, MV_FWD_X2, MV_FWD_A1, MV_PRED_LEFT, BLK_16X8, ref[2]);
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break;
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case P_8X16:
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ref[0] = h->ref_flag ? 0 : get_bits1(gb);
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ref[1] = h->ref_flag ? 0 : get_bits1(gb);
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ff_cavs_mv(h, MV_FWD_X0, MV_FWD_B3, MV_PRED_LEFT, BLK_8X16, ref[0]);
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ff_cavs_mv(h, MV_FWD_X1, MV_FWD_C2, MV_PRED_TOPRIGHT,BLK_8X16, ref[1]);
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break;
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case P_8X8:
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ref[0] = h->ref_flag ? 0 : get_bits1(gb);
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ref[1] = h->ref_flag ? 0 : get_bits1(gb);
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ref[2] = h->ref_flag ? 0 : get_bits1(gb);
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ref[3] = h->ref_flag ? 0 : get_bits1(gb);
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ff_cavs_mv(h, MV_FWD_X0, MV_FWD_B3, MV_PRED_MEDIAN, BLK_8X8, ref[0]);
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ff_cavs_mv(h, MV_FWD_X1, MV_FWD_C2, MV_PRED_MEDIAN, BLK_8X8, ref[1]);
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ff_cavs_mv(h, MV_FWD_X2, MV_FWD_X1, MV_PRED_MEDIAN, BLK_8X8, ref[2]);
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ff_cavs_mv(h, MV_FWD_X3, MV_FWD_X0, MV_PRED_MEDIAN, BLK_8X8, ref[3]);
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}
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ff_cavs_inter(h, mb_type);
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set_intra_mode_default(h);
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store_mvs(h);
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if(mb_type != P_SKIP)
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decode_residual_inter(h);
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ff_cavs_filter(h,mb_type);
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h->col_type_base[h->mbidx] = mb_type;
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}
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static void decode_mb_b(AVSContext *h, enum cavs_mb mb_type) {
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int block;
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enum cavs_sub_mb sub_type[4];
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int flags;
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ff_cavs_init_mb(h);
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/* reset all MVs */
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h->mv[MV_FWD_X0] = ff_cavs_dir_mv;
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set_mvs(&h->mv[MV_FWD_X0], BLK_16X16);
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h->mv[MV_BWD_X0] = ff_cavs_dir_mv;
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set_mvs(&h->mv[MV_BWD_X0], BLK_16X16);
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switch(mb_type) {
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case B_SKIP:
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case B_DIRECT:
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if(!h->col_type_base[h->mbidx]) {
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/* intra MB at co-location, do in-plane prediction */
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ff_cavs_mv(h, MV_FWD_X0, MV_FWD_C2, MV_PRED_BSKIP, BLK_16X16, 1);
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ff_cavs_mv(h, MV_BWD_X0, MV_BWD_C2, MV_PRED_BSKIP, BLK_16X16, 0);
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} else
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/* direct prediction from co-located P MB, block-wise */
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for(block=0;block<4;block++)
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mv_pred_direct(h,&h->mv[mv_scan[block]],
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&h->col_mv[h->mbidx*4 + block]);
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break;
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case B_FWD_16X16:
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ff_cavs_mv(h, MV_FWD_X0, MV_FWD_C2, MV_PRED_MEDIAN, BLK_16X16, 1);
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break;
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case B_SYM_16X16:
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ff_cavs_mv(h, MV_FWD_X0, MV_FWD_C2, MV_PRED_MEDIAN, BLK_16X16, 1);
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mv_pred_sym(h, &h->mv[MV_FWD_X0], BLK_16X16);
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break;
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case B_BWD_16X16:
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ff_cavs_mv(h, MV_BWD_X0, MV_BWD_C2, MV_PRED_MEDIAN, BLK_16X16, 0);
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break;
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case B_8X8:
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for(block=0;block<4;block++)
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sub_type[block] = get_bits(&h->s.gb,2);
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for(block=0;block<4;block++) {
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switch(sub_type[block]) {
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case B_SUB_DIRECT:
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if(!h->col_type_base[h->mbidx]) {
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/* intra MB at co-location, do in-plane prediction */
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ff_cavs_mv(h, mv_scan[block], mv_scan[block]-3,
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MV_PRED_BSKIP, BLK_8X8, 1);
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ff_cavs_mv(h, mv_scan[block]+MV_BWD_OFFS,
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mv_scan[block]-3+MV_BWD_OFFS,
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MV_PRED_BSKIP, BLK_8X8, 0);
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} else
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mv_pred_direct(h,&h->mv[mv_scan[block]],
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&h->col_mv[h->mbidx*4 + block]);
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break;
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case B_SUB_FWD:
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ff_cavs_mv(h, mv_scan[block], mv_scan[block]-3,
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MV_PRED_MEDIAN, BLK_8X8, 1);
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break;
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case B_SUB_SYM:
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ff_cavs_mv(h, mv_scan[block], mv_scan[block]-3,
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MV_PRED_MEDIAN, BLK_8X8, 1);
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mv_pred_sym(h, &h->mv[mv_scan[block]], BLK_8X8);
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break;
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}
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}
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for(block=0;block<4;block++) {
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if(sub_type[block] == B_SUB_BWD)
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ff_cavs_mv(h, mv_scan[block]+MV_BWD_OFFS,
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mv_scan[block]+MV_BWD_OFFS-3,
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MV_PRED_MEDIAN, BLK_8X8, 0);
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}
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break;
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default:
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assert((mb_type > B_SYM_16X16) && (mb_type < B_8X8));
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flags = ff_cavs_partition_flags[mb_type];
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if(mb_type & 1) { /* 16x8 macroblock types */
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if(flags & FWD0)
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ff_cavs_mv(h, MV_FWD_X0, MV_FWD_C2, MV_PRED_TOP, BLK_16X8, 1);
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if(flags & SYM0)
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mv_pred_sym(h, &h->mv[MV_FWD_X0], BLK_16X8);
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if(flags & FWD1)
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ff_cavs_mv(h, MV_FWD_X2, MV_FWD_A1, MV_PRED_LEFT, BLK_16X8, 1);
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if(flags & SYM1)
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mv_pred_sym(h, &h->mv[MV_FWD_X2], BLK_16X8);
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if(flags & BWD0)
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ff_cavs_mv(h, MV_BWD_X0, MV_BWD_C2, MV_PRED_TOP, BLK_16X8, 0);
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if(flags & BWD1)
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ff_cavs_mv(h, MV_BWD_X2, MV_BWD_A1, MV_PRED_LEFT, BLK_16X8, 0);
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} else { /* 8x16 macroblock types */
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if(flags & FWD0)
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ff_cavs_mv(h, MV_FWD_X0, MV_FWD_B3, MV_PRED_LEFT, BLK_8X16, 1);
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if(flags & SYM0)
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mv_pred_sym(h, &h->mv[MV_FWD_X0], BLK_8X16);
|
|
if(flags & FWD1)
|
|
ff_cavs_mv(h,MV_FWD_X1,MV_FWD_C2,MV_PRED_TOPRIGHT,BLK_8X16,1);
|
|
if(flags & SYM1)
|
|
mv_pred_sym(h, &h->mv[MV_FWD_X1], BLK_8X16);
|
|
if(flags & BWD0)
|
|
ff_cavs_mv(h, MV_BWD_X0, MV_BWD_B3, MV_PRED_LEFT, BLK_8X16, 0);
|
|
if(flags & BWD1)
|
|
ff_cavs_mv(h,MV_BWD_X1,MV_BWD_C2,MV_PRED_TOPRIGHT,BLK_8X16,0);
|
|
}
|
|
}
|
|
ff_cavs_inter(h, mb_type);
|
|
set_intra_mode_default(h);
|
|
if(mb_type != B_SKIP)
|
|
decode_residual_inter(h);
|
|
ff_cavs_filter(h,mb_type);
|
|
}
|
|
|
|
/*****************************************************************************
|
|
*
|
|
* slice level
|
|
*
|
|
****************************************************************************/
|
|
|
|
static inline int decode_slice_header(AVSContext *h, GetBitContext *gb) {
|
|
if(h->stc > 0xAF)
|
|
av_log(h->s.avctx, AV_LOG_ERROR, "unexpected start code 0x%02x\n", h->stc);
|
|
h->mby = h->stc;
|
|
h->mbidx = h->mby*h->mb_width;
|
|
|
|
/* mark top macroblocks as unavailable */
|
|
h->flags &= ~(B_AVAIL|C_AVAIL);
|
|
if((h->mby == 0) && (!h->qp_fixed)){
|
|
h->qp_fixed = get_bits1(gb);
|
|
h->qp = get_bits(gb,6);
|
|
}
|
|
/* inter frame or second slice can have weighting params */
|
|
if((h->pic_type != FF_I_TYPE) || (!h->pic_structure && h->mby >= h->mb_width/2))
|
|
if(get_bits1(gb)) { //slice_weighting_flag
|
|
av_log(h->s.avctx, AV_LOG_ERROR,
|
|
"weighted prediction not yet supported\n");
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static inline int check_for_slice(AVSContext *h) {
|
|
GetBitContext *gb = &h->s.gb;
|
|
int align;
|
|
|
|
if(h->mbx)
|
|
return 0;
|
|
align = (-get_bits_count(gb)) & 7;
|
|
/* check for stuffing byte */
|
|
if(!align && (show_bits(gb,8) == 0x80))
|
|
align = 8;
|
|
if((show_bits_long(gb,24+align) & 0xFFFFFF) == 0x000001) {
|
|
skip_bits_long(gb,24+align);
|
|
h->stc = get_bits(gb,8);
|
|
decode_slice_header(h,gb);
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*****************************************************************************
|
|
*
|
|
* frame level
|
|
*
|
|
****************************************************************************/
|
|
|
|
static int decode_pic(AVSContext *h) {
|
|
MpegEncContext *s = &h->s;
|
|
int skip_count = -1;
|
|
enum cavs_mb mb_type;
|
|
|
|
if (!s->context_initialized) {
|
|
s->avctx->idct_algo = FF_IDCT_CAVS;
|
|
if (MPV_common_init(s) < 0)
|
|
return -1;
|
|
ff_init_scantable(s->dsp.idct_permutation,&h->scantable,ff_zigzag_direct);
|
|
}
|
|
skip_bits(&s->gb,16);//bbv_dwlay
|
|
if(h->stc == PIC_PB_START_CODE) {
|
|
h->pic_type = get_bits(&s->gb,2) + FF_I_TYPE;
|
|
if(h->pic_type > FF_B_TYPE) {
|
|
av_log(s->avctx, AV_LOG_ERROR, "illegal picture type\n");
|
|
return -1;
|
|
}
|
|
/* make sure we have the reference frames we need */
|
|
if(!h->DPB[0].data[0] ||
|
|
(!h->DPB[1].data[0] && h->pic_type == FF_B_TYPE))
|
|
return -1;
|
|
} else {
|
|
h->pic_type = FF_I_TYPE;
|
|
if(get_bits1(&s->gb))
|
|
skip_bits(&s->gb,24);//time_code
|
|
/* old sample clips were all progressive and no low_delay,
|
|
bump stream revision if detected otherwise */
|
|
if((s->low_delay) || !(show_bits(&s->gb,9) & 1))
|
|
h->stream_revision = 1;
|
|
/* similarly test top_field_first and repeat_first_field */
|
|
else if(show_bits(&s->gb,11) & 3)
|
|
h->stream_revision = 1;
|
|
if(h->stream_revision > 0)
|
|
skip_bits(&s->gb,1); //marker_bit
|
|
}
|
|
/* release last B frame */
|
|
if(h->picture.data[0])
|
|
s->avctx->release_buffer(s->avctx, (AVFrame *)&h->picture);
|
|
|
|
s->avctx->get_buffer(s->avctx, (AVFrame *)&h->picture);
|
|
ff_cavs_init_pic(h);
|
|
h->picture.poc = get_bits(&s->gb,8)*2;
|
|
|
|
/* get temporal distances and MV scaling factors */
|
|
if(h->pic_type != FF_B_TYPE) {
|
|
h->dist[0] = (h->picture.poc - h->DPB[0].poc + 512) % 512;
|
|
} else {
|
|
h->dist[0] = (h->DPB[0].poc - h->picture.poc + 512) % 512;
|
|
}
|
|
h->dist[1] = (h->picture.poc - h->DPB[1].poc + 512) % 512;
|
|
h->scale_den[0] = h->dist[0] ? 512/h->dist[0] : 0;
|
|
h->scale_den[1] = h->dist[1] ? 512/h->dist[1] : 0;
|
|
if(h->pic_type == FF_B_TYPE) {
|
|
h->sym_factor = h->dist[0]*h->scale_den[1];
|
|
} else {
|
|
h->direct_den[0] = h->dist[0] ? 16384/h->dist[0] : 0;
|
|
h->direct_den[1] = h->dist[1] ? 16384/h->dist[1] : 0;
|
|
}
|
|
|
|
if(s->low_delay)
|
|
get_ue_golomb(&s->gb); //bbv_check_times
|
|
h->progressive = get_bits1(&s->gb);
|
|
h->pic_structure = 1;
|
|
if(!h->progressive)
|
|
h->pic_structure = get_bits1(&s->gb);
|
|
if(!h->pic_structure && h->stc == PIC_PB_START_CODE)
|
|
skip_bits1(&s->gb); //advanced_pred_mode_disable
|
|
skip_bits1(&s->gb); //top_field_first
|
|
skip_bits1(&s->gb); //repeat_first_field
|
|
h->qp_fixed = get_bits1(&s->gb);
|
|
h->qp = get_bits(&s->gb,6);
|
|
if(h->pic_type == FF_I_TYPE) {
|
|
if(!h->progressive && !h->pic_structure)
|
|
skip_bits1(&s->gb);//what is this?
|
|
skip_bits(&s->gb,4); //reserved bits
|
|
} else {
|
|
if(!(h->pic_type == FF_B_TYPE && h->pic_structure == 1))
|
|
h->ref_flag = get_bits1(&s->gb);
|
|
skip_bits(&s->gb,4); //reserved bits
|
|
h->skip_mode_flag = get_bits1(&s->gb);
|
|
}
|
|
h->loop_filter_disable = get_bits1(&s->gb);
|
|
if(!h->loop_filter_disable && get_bits1(&s->gb)) {
|
|
h->alpha_offset = get_se_golomb(&s->gb);
|
|
h->beta_offset = get_se_golomb(&s->gb);
|
|
} else {
|
|
h->alpha_offset = h->beta_offset = 0;
|
|
}
|
|
if(h->pic_type == FF_I_TYPE) {
|
|
do {
|
|
check_for_slice(h);
|
|
decode_mb_i(h, 0);
|
|
} while(ff_cavs_next_mb(h));
|
|
} else if(h->pic_type == FF_P_TYPE) {
|
|
do {
|
|
if(check_for_slice(h))
|
|
skip_count = -1;
|
|
if(h->skip_mode_flag && (skip_count < 0))
|
|
skip_count = get_ue_golomb(&s->gb);
|
|
if(h->skip_mode_flag && skip_count--) {
|
|
decode_mb_p(h,P_SKIP);
|
|
} else {
|
|
mb_type = get_ue_golomb(&s->gb) + P_SKIP + h->skip_mode_flag;
|
|
if(mb_type > P_8X8)
|
|
decode_mb_i(h, mb_type - P_8X8 - 1);
|
|
else
|
|
decode_mb_p(h,mb_type);
|
|
}
|
|
} while(ff_cavs_next_mb(h));
|
|
} else { /* FF_B_TYPE */
|
|
do {
|
|
if(check_for_slice(h))
|
|
skip_count = -1;
|
|
if(h->skip_mode_flag && (skip_count < 0))
|
|
skip_count = get_ue_golomb(&s->gb);
|
|
if(h->skip_mode_flag && skip_count--) {
|
|
decode_mb_b(h,B_SKIP);
|
|
} else {
|
|
mb_type = get_ue_golomb(&s->gb) + B_SKIP + h->skip_mode_flag;
|
|
if(mb_type > B_8X8)
|
|
decode_mb_i(h, mb_type - B_8X8 - 1);
|
|
else
|
|
decode_mb_b(h,mb_type);
|
|
}
|
|
} while(ff_cavs_next_mb(h));
|
|
}
|
|
if(h->pic_type != FF_B_TYPE) {
|
|
if(h->DPB[1].data[0])
|
|
s->avctx->release_buffer(s->avctx, (AVFrame *)&h->DPB[1]);
|
|
h->DPB[1] = h->DPB[0];
|
|
h->DPB[0] = h->picture;
|
|
memset(&h->picture,0,sizeof(Picture));
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*****************************************************************************
|
|
*
|
|
* headers and interface
|
|
*
|
|
****************************************************************************/
|
|
|
|
static int decode_seq_header(AVSContext *h) {
|
|
MpegEncContext *s = &h->s;
|
|
int frame_rate_code;
|
|
|
|
h->profile = get_bits(&s->gb,8);
|
|
h->level = get_bits(&s->gb,8);
|
|
skip_bits1(&s->gb); //progressive sequence
|
|
s->width = get_bits(&s->gb,14);
|
|
s->height = get_bits(&s->gb,14);
|
|
skip_bits(&s->gb,2); //chroma format
|
|
skip_bits(&s->gb,3); //sample_precision
|
|
h->aspect_ratio = get_bits(&s->gb,4);
|
|
frame_rate_code = get_bits(&s->gb,4);
|
|
skip_bits(&s->gb,18);//bit_rate_lower
|
|
skip_bits1(&s->gb); //marker_bit
|
|
skip_bits(&s->gb,12);//bit_rate_upper
|
|
s->low_delay = get_bits1(&s->gb);
|
|
h->mb_width = (s->width + 15) >> 4;
|
|
h->mb_height = (s->height + 15) >> 4;
|
|
h->s.avctx->time_base.den = ff_frame_rate_tab[frame_rate_code].num;
|
|
h->s.avctx->time_base.num = ff_frame_rate_tab[frame_rate_code].den;
|
|
h->s.avctx->width = s->width;
|
|
h->s.avctx->height = s->height;
|
|
if(!h->top_qp)
|
|
ff_cavs_init_top_lines(h);
|
|
return 0;
|
|
}
|
|
|
|
static void cavs_flush(AVCodecContext * avctx) {
|
|
AVSContext *h = avctx->priv_data;
|
|
h->got_keyframe = 0;
|
|
}
|
|
|
|
static int cavs_decode_frame(AVCodecContext * avctx,void *data, int *data_size,
|
|
AVPacket *avpkt) {
|
|
const uint8_t *buf = avpkt->data;
|
|
int buf_size = avpkt->size;
|
|
AVSContext *h = avctx->priv_data;
|
|
MpegEncContext *s = &h->s;
|
|
int input_size;
|
|
const uint8_t *buf_end;
|
|
const uint8_t *buf_ptr;
|
|
AVFrame *picture = data;
|
|
uint32_t stc = -1;
|
|
|
|
s->avctx = avctx;
|
|
|
|
if (buf_size == 0) {
|
|
if(!s->low_delay && h->DPB[0].data[0]) {
|
|
*data_size = sizeof(AVPicture);
|
|
*picture = *(AVFrame *) &h->DPB[0];
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
buf_ptr = buf;
|
|
buf_end = buf + buf_size;
|
|
for(;;) {
|
|
buf_ptr = ff_find_start_code(buf_ptr,buf_end, &stc);
|
|
if(stc & 0xFFFFFE00)
|
|
return FFMAX(0, buf_ptr - buf - s->parse_context.last_index);
|
|
input_size = (buf_end - buf_ptr)*8;
|
|
switch(stc) {
|
|
case CAVS_START_CODE:
|
|
init_get_bits(&s->gb, buf_ptr, input_size);
|
|
decode_seq_header(h);
|
|
break;
|
|
case PIC_I_START_CODE:
|
|
if(!h->got_keyframe) {
|
|
if(h->DPB[0].data[0])
|
|
avctx->release_buffer(avctx, (AVFrame *)&h->DPB[0]);
|
|
if(h->DPB[1].data[0])
|
|
avctx->release_buffer(avctx, (AVFrame *)&h->DPB[1]);
|
|
h->got_keyframe = 1;
|
|
}
|
|
case PIC_PB_START_CODE:
|
|
*data_size = 0;
|
|
if(!h->got_keyframe)
|
|
break;
|
|
init_get_bits(&s->gb, buf_ptr, input_size);
|
|
h->stc = stc;
|
|
if(decode_pic(h))
|
|
break;
|
|
*data_size = sizeof(AVPicture);
|
|
if(h->pic_type != FF_B_TYPE) {
|
|
if(h->DPB[1].data[0]) {
|
|
*picture = *(AVFrame *) &h->DPB[1];
|
|
} else {
|
|
*data_size = 0;
|
|
}
|
|
} else
|
|
*picture = *(AVFrame *) &h->picture;
|
|
break;
|
|
case EXT_START_CODE:
|
|
//mpeg_decode_extension(avctx,buf_ptr, input_size);
|
|
break;
|
|
case USER_START_CODE:
|
|
//mpeg_decode_user_data(avctx,buf_ptr, input_size);
|
|
break;
|
|
default:
|
|
if (stc <= SLICE_MAX_START_CODE) {
|
|
init_get_bits(&s->gb, buf_ptr, input_size);
|
|
decode_slice_header(h, &s->gb);
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
AVCodec ff_cavs_decoder = {
|
|
"cavs",
|
|
AVMEDIA_TYPE_VIDEO,
|
|
CODEC_ID_CAVS,
|
|
sizeof(AVSContext),
|
|
ff_cavs_init,
|
|
NULL,
|
|
ff_cavs_end,
|
|
cavs_decode_frame,
|
|
CODEC_CAP_DR1 | CODEC_CAP_DELAY,
|
|
.flush= cavs_flush,
|
|
.long_name= NULL_IF_CONFIG_SMALL("Chinese AVS video (AVS1-P2, JiZhun profile)"),
|
|
};
|