From 844d9012a64db8c81c96a7efe337e682224aecf7 Mon Sep 17 00:00:00 2001 From: Stefan Gehrer Date: Sun, 8 Jul 2007 07:37:30 +0000 Subject: [PATCH] split decoder-specific parts into their own file Originally committed as revision 9533 to svn://svn.ffmpeg.org/ffmpeg/trunk --- libavcodec/Makefile | 2 +- libavcodec/cavs.c | 637 -------------------------------------- libavcodec/cavsdata.h | 16 - libavcodec/cavsdec.c | 702 ++++++++++++++++++++++++++++++++++++++++++ 4 files changed, 703 insertions(+), 654 deletions(-) create mode 100644 libavcodec/cavsdec.c diff --git a/libavcodec/Makefile b/libavcodec/Makefile index 2d793ea5d1..6bcabc0f76 100644 --- a/libavcodec/Makefile +++ b/libavcodec/Makefile @@ -48,7 +48,7 @@ OBJS-$(CONFIG_BETHSOFTVID_DECODER) += bethsoftvideo.o OBJS-$(CONFIG_BMP_DECODER) += bmp.o OBJS-$(CONFIG_BMP_ENCODER) += bmpenc.o OBJS-$(CONFIG_C93_DECODER) += c93.o -OBJS-$(CONFIG_CAVS_DECODER) += cavs.o cavsdsp.o golomb.o +OBJS-$(CONFIG_CAVS_DECODER) += cavs.o cavsdec.o cavsdsp.o golomb.o OBJS-$(CONFIG_CINEPAK_DECODER) += cinepak.o OBJS-$(CONFIG_CLJR_DECODER) += cljr.o OBJS-$(CONFIG_CLJR_ENCODER) += cljr.o diff --git a/libavcodec/cavs.c b/libavcodec/cavs.c index 722b1a16ff..31b7e58e95 100644 --- a/libavcodec/cavs.c +++ b/libavcodec/cavs.c @@ -360,13 +360,6 @@ void ff_cavs_inter(AVSContext *h, enum mb_t mb_type) { * ****************************************************************************/ -static inline void store_mvs(AVSContext *h) { - h->col_mv[(h->mby*h->mb_width + h->mbx)*4 + 0] = h->mv[MV_FWD_X0]; - h->col_mv[(h->mby*h->mb_width + h->mbx)*4 + 1] = h->mv[MV_FWD_X1]; - h->col_mv[(h->mby*h->mb_width + h->mbx)*4 + 2] = h->mv[MV_FWD_X2]; - h->col_mv[(h->mby*h->mb_width + h->mbx)*4 + 3] = h->mv[MV_FWD_X3]; -} - static inline void scale_mv(AVSContext *h, int *d_x, int *d_y, vector_t *src, int distp) { int den = h->scale_den[src->ref]; @@ -399,35 +392,6 @@ static inline void mv_pred_median(AVSContext *h, vector_t *mvP, vector_t *mvA, v } } -static inline void mv_pred_direct(AVSContext *h, vector_t *pmv_fw, - vector_t *col_mv) { - vector_t *pmv_bw = pmv_fw + MV_BWD_OFFS; - int den = h->direct_den[col_mv->ref]; - int m = col_mv->x >> 31; - - pmv_fw->dist = h->dist[1]; - pmv_bw->dist = h->dist[0]; - pmv_fw->ref = 1; - pmv_bw->ref = 0; - /* scale the co-located motion vector according to its temporal span */ - pmv_fw->x = (((den+(den*col_mv->x*pmv_fw->dist^m)-m-1)>>14)^m)-m; - pmv_bw->x = m-(((den+(den*col_mv->x*pmv_bw->dist^m)-m-1)>>14)^m); - m = col_mv->y >> 31; - pmv_fw->y = (((den+(den*col_mv->y*pmv_fw->dist^m)-m-1)>>14)^m)-m; - pmv_bw->y = m-(((den+(den*col_mv->y*pmv_bw->dist^m)-m-1)>>14)^m); -} - -static inline void mv_pred_sym(AVSContext *h, vector_t *src, enum block_t size) { - vector_t *dst = src + MV_BWD_OFFS; - - /* backward mv is the scaled and negated forward mv */ - dst->x = -((src->x * h->sym_factor + 256) >> 9); - dst->y = -((src->y * h->sym_factor + 256) >> 9); - dst->ref = 0; - dst->dist = h->dist[0]; - set_mvs(dst, size); -} - void ff_cavs_mv(AVSContext *h, enum mv_loc_t nP, enum mv_loc_t nC, enum mv_pred_t mode, enum block_t size, int ref) { vector_t *mvP = &h->mv[nP]; @@ -472,356 +436,6 @@ void ff_cavs_mv(AVSContext *h, enum mv_loc_t nP, enum mv_loc_t nC, set_mvs(mvP,size); } -/***************************************************************************** - * - * residual data decoding - * - ****************************************************************************/ - -/** kth-order exponential golomb code */ -static inline int get_ue_code(GetBitContext *gb, int order) { - if(order) { - int ret = get_ue_golomb(gb) << order; - return ret + get_bits(gb,order); - } - return get_ue_golomb(gb); -} - -/** - * decode coefficients from one 8x8 block, dequantize, inverse transform - * and add them to sample block - * @param r pointer to 2D VLC table - * @param esc_golomb_order escape codes are k-golomb with this order k - * @param qp quantizer - * @param dst location of sample block - * @param stride line stride in frame buffer - */ -static int decode_residual_block(AVSContext *h, GetBitContext *gb, - const dec_2dvlc_t *r, int esc_golomb_order, - int qp, uint8_t *dst, int stride) { - int i, level_code, esc_code, level, run, mask; - DCTELEM level_buf[64]; - uint8_t run_buf[64]; - DCTELEM *block = h->block; - - for(i=0;i<65;i++) { - level_code = get_ue_code(gb,r->golomb_order); - if(level_code >= ESCAPE_CODE) { - run = ((level_code - ESCAPE_CODE) >> 1) + 1; - esc_code = get_ue_code(gb,esc_golomb_order); - level = esc_code + (run > r->max_run ? 1 : r->level_add[run]); - while(level > r->inc_limit) - r++; - mask = -(level_code & 1); - level = (level^mask) - mask; - } else { - level = r->rltab[level_code][0]; - if(!level) //end of block signal - break; - run = r->rltab[level_code][1]; - r += r->rltab[level_code][2]; - } - level_buf[i] = level; - run_buf[i] = run; - } - if(dequant(h,level_buf, run_buf, block, ff_cavs_dequant_mul[qp], - ff_cavs_dequant_shift[qp], i)) - return -1; - h->s.dsp.cavs_idct8_add(dst,block,stride); - return 0; -} - - -static inline void decode_residual_chroma(AVSContext *h) { - if(h->cbp & (1<<4)) - decode_residual_block(h,&h->s.gb,ff_cavs_chroma_dec,0, - ff_cavs_chroma_qp[h->qp],h->cu,h->c_stride); - if(h->cbp & (1<<5)) - decode_residual_block(h,&h->s.gb,ff_cavs_chroma_dec,0, - ff_cavs_chroma_qp[h->qp],h->cv,h->c_stride); -} - -static inline int decode_residual_inter(AVSContext *h) { - int block; - - /* get coded block pattern */ - int cbp= get_ue_golomb(&h->s.gb); - if(cbp > 63){ - av_log(h->s.avctx, AV_LOG_ERROR, "illegal inter cbp\n"); - return -1; - } - h->cbp = cbp_tab[cbp][1]; - - /* get quantizer */ - if(h->cbp && !h->qp_fixed) - h->qp = (h->qp + get_se_golomb(&h->s.gb)) & 63; - for(block=0;block<4;block++) - if(h->cbp & (1<s.gb,ff_cavs_inter_dec,0,h->qp, - h->cy + h->luma_scan[block], h->l_stride); - decode_residual_chroma(h); - - return 0; -} - -/***************************************************************************** - * - * macroblock level - * - ****************************************************************************/ - -static int decode_mb_i(AVSContext *h, int cbp_code) { - GetBitContext *gb = &h->s.gb; - int block, pred_mode_uv; - uint8_t top[18]; - uint8_t *left = NULL; - uint8_t *d; - - init_mb(h); - - /* get intra prediction modes from stream */ - for(block=0;block<4;block++) { - int nA,nB,predpred; - int pos = ff_cavs_scan3x3[block]; - - nA = h->pred_mode_Y[pos-1]; - nB = h->pred_mode_Y[pos-3]; - predpred = FFMIN(nA,nB); - if(predpred == NOT_AVAIL) // if either is not available - predpred = INTRA_L_LP; - if(!get_bits1(gb)){ - int rem_mode= get_bits(gb, 2); - predpred = rem_mode + (rem_mode >= predpred); - } - h->pred_mode_Y[pos] = predpred; - } - pred_mode_uv = get_ue_golomb(gb); - if(pred_mode_uv > 6) { - av_log(h->s.avctx, AV_LOG_ERROR, "illegal intra chroma pred mode\n"); - return -1; - } - modify_mb_i(h, &pred_mode_uv); - - /* get coded block pattern */ - if(h->pic_type == FF_I_TYPE) - cbp_code = get_ue_golomb(gb); - if(cbp_code > 63){ - av_log(h->s.avctx, AV_LOG_ERROR, "illegal intra cbp\n"); - return -1; - } - h->cbp = cbp_tab[cbp_code][0]; - if(h->cbp && !h->qp_fixed) - h->qp = (h->qp + get_se_golomb(gb)) & 63; //qp_delta - - /* luma intra prediction interleaved with residual decode/transform/add */ - for(block=0;block<4;block++) { - d = h->cy + h->luma_scan[block]; - load_intra_pred_luma(h, top, &left, block); - h->intra_pred_l[h->pred_mode_Y[ff_cavs_scan3x3[block]]] - (d, top, left, h->l_stride); - if(h->cbp & (1<qp,d,h->l_stride); - } - - /* chroma intra prediction */ - load_intra_pred_chroma(h); - h->intra_pred_c[pred_mode_uv](h->cu, &h->top_border_u[h->mbx*10], - h->left_border_u, h->c_stride); - h->intra_pred_c[pred_mode_uv](h->cv, &h->top_border_v[h->mbx*10], - h->left_border_v, h->c_stride); - - decode_residual_chroma(h); - ff_cavs_filter(h,I_8X8); - set_mv_intra(h); - return 0; -} - -static void decode_mb_p(AVSContext *h, enum mb_t mb_type) { - GetBitContext *gb = &h->s.gb; - int ref[4]; - - init_mb(h); - switch(mb_type) { - case P_SKIP: - ff_cavs_mv(h, MV_FWD_X0, MV_FWD_C2, MV_PRED_PSKIP, BLK_16X16, 0); - break; - case P_16X16: - ref[0] = h->ref_flag ? 0 : get_bits1(gb); - ff_cavs_mv(h, MV_FWD_X0, MV_FWD_C2, MV_PRED_MEDIAN, BLK_16X16,ref[0]); - break; - case P_16X8: - ref[0] = h->ref_flag ? 0 : get_bits1(gb); - ref[2] = h->ref_flag ? 0 : get_bits1(gb); - ff_cavs_mv(h, MV_FWD_X0, MV_FWD_C2, MV_PRED_TOP, BLK_16X8, ref[0]); - ff_cavs_mv(h, MV_FWD_X2, MV_FWD_A1, MV_PRED_LEFT, BLK_16X8, ref[2]); - break; - case P_8X16: - ref[0] = h->ref_flag ? 0 : get_bits1(gb); - ref[1] = h->ref_flag ? 0 : get_bits1(gb); - ff_cavs_mv(h, MV_FWD_X0, MV_FWD_B3, MV_PRED_LEFT, BLK_8X16, ref[0]); - ff_cavs_mv(h, MV_FWD_X1, MV_FWD_C2, MV_PRED_TOPRIGHT,BLK_8X16, ref[1]); - break; - case P_8X8: - ref[0] = h->ref_flag ? 0 : get_bits1(gb); - ref[1] = h->ref_flag ? 0 : get_bits1(gb); - ref[2] = h->ref_flag ? 0 : get_bits1(gb); - ref[3] = h->ref_flag ? 0 : get_bits1(gb); - ff_cavs_mv(h, MV_FWD_X0, MV_FWD_B3, MV_PRED_MEDIAN, BLK_8X8, ref[0]); - ff_cavs_mv(h, MV_FWD_X1, MV_FWD_C2, MV_PRED_MEDIAN, BLK_8X8, ref[1]); - ff_cavs_mv(h, MV_FWD_X2, MV_FWD_X1, MV_PRED_MEDIAN, BLK_8X8, ref[2]); - ff_cavs_mv(h, MV_FWD_X3, MV_FWD_X0, MV_PRED_MEDIAN, BLK_8X8, ref[3]); - } - ff_cavs_inter(h, mb_type); - set_intra_mode_default(h); - store_mvs(h); - if(mb_type != P_SKIP) - decode_residual_inter(h); - ff_cavs_filter(h,mb_type); - *h->col_type = mb_type; -} - -static void decode_mb_b(AVSContext *h, enum mb_t mb_type) { - int block; - enum sub_mb_t sub_type[4]; - int flags; - - init_mb(h); - - /* reset all MVs */ - h->mv[MV_FWD_X0] = ff_cavs_dir_mv; - set_mvs(&h->mv[MV_FWD_X0], BLK_16X16); - h->mv[MV_BWD_X0] = ff_cavs_dir_mv; - set_mvs(&h->mv[MV_BWD_X0], BLK_16X16); - switch(mb_type) { - case B_SKIP: - case B_DIRECT: - if(!(*h->col_type)) { - /* intra MB at co-location, do in-plane prediction */ - ff_cavs_mv(h, MV_FWD_X0, MV_FWD_C2, MV_PRED_BSKIP, BLK_16X16, 1); - ff_cavs_mv(h, MV_BWD_X0, MV_BWD_C2, MV_PRED_BSKIP, BLK_16X16, 0); - } else - /* direct prediction from co-located P MB, block-wise */ - for(block=0;block<4;block++) - mv_pred_direct(h,&h->mv[mv_scan[block]], - &h->col_mv[(h->mby*h->mb_width+h->mbx)*4 + block]); - break; - case B_FWD_16X16: - ff_cavs_mv(h, MV_FWD_X0, MV_FWD_C2, MV_PRED_MEDIAN, BLK_16X16, 1); - break; - case B_SYM_16X16: - ff_cavs_mv(h, MV_FWD_X0, MV_FWD_C2, MV_PRED_MEDIAN, BLK_16X16, 1); - mv_pred_sym(h, &h->mv[MV_FWD_X0], BLK_16X16); - break; - case B_BWD_16X16: - ff_cavs_mv(h, MV_BWD_X0, MV_BWD_C2, MV_PRED_MEDIAN, BLK_16X16, 0); - break; - case B_8X8: - for(block=0;block<4;block++) - sub_type[block] = get_bits(&h->s.gb,2); - for(block=0;block<4;block++) { - switch(sub_type[block]) { - case B_SUB_DIRECT: - if(!(*h->col_type)) { - /* intra MB at co-location, do in-plane prediction */ - ff_cavs_mv(h, mv_scan[block], mv_scan[block]-3, - MV_PRED_BSKIP, BLK_8X8, 1); - ff_cavs_mv(h, mv_scan[block]+MV_BWD_OFFS, - mv_scan[block]-3+MV_BWD_OFFS, - MV_PRED_BSKIP, BLK_8X8, 0); - } else - mv_pred_direct(h,&h->mv[mv_scan[block]], - &h->col_mv[(h->mby*h->mb_width + h->mbx)*4 + block]); - break; - case B_SUB_FWD: - ff_cavs_mv(h, mv_scan[block], mv_scan[block]-3, - MV_PRED_MEDIAN, BLK_8X8, 1); - break; - case B_SUB_SYM: - ff_cavs_mv(h, mv_scan[block], mv_scan[block]-3, - MV_PRED_MEDIAN, BLK_8X8, 1); - mv_pred_sym(h, &h->mv[mv_scan[block]], BLK_8X8); - break; - } - } - for(block=0;block<4;block++) { - if(sub_type[block] == B_SUB_BWD) - ff_cavs_mv(h, mv_scan[block]+MV_BWD_OFFS, - mv_scan[block]+MV_BWD_OFFS-3, - MV_PRED_MEDIAN, BLK_8X8, 0); - } - break; - default: - assert((mb_type > B_SYM_16X16) && (mb_type < B_8X8)); - flags = ff_cavs_partition_flags[mb_type]; - if(mb_type & 1) { /* 16x8 macroblock types */ - if(flags & FWD0) - ff_cavs_mv(h, MV_FWD_X0, MV_FWD_C2, MV_PRED_TOP, BLK_16X8, 1); - if(flags & SYM0) - mv_pred_sym(h, &h->mv[MV_FWD_X0], BLK_16X8); - if(flags & FWD1) - ff_cavs_mv(h, MV_FWD_X2, MV_FWD_A1, MV_PRED_LEFT, BLK_16X8, 1); - if(flags & SYM1) - mv_pred_sym(h, &h->mv[MV_FWD_X2], BLK_16X8); - if(flags & BWD0) - ff_cavs_mv(h, MV_BWD_X0, MV_BWD_C2, MV_PRED_TOP, BLK_16X8, 0); - if(flags & BWD1) - ff_cavs_mv(h, MV_BWD_X2, MV_BWD_A1, MV_PRED_LEFT, BLK_16X8, 0); - } else { /* 8x16 macroblock types */ - if(flags & FWD0) - ff_cavs_mv(h, MV_FWD_X0, MV_FWD_B3, MV_PRED_LEFT, BLK_8X16, 1); - if(flags & SYM0) - 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; - 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 void check_for_slice(AVSContext *h) { - GetBitContext *gb = &h->s.gb; - int align; - align = (-get_bits_count(gb)) & 7; - if((show_bits_long(gb,24+align) & 0xFFFFFF) == 0x000001) { - get_bits_long(gb,24+align); - h->stc = get_bits(gb,8); - decode_slice_header(h,gb); - } -} - /***************************************************************************** * * frame level @@ -850,136 +464,6 @@ void ff_cavs_init_pic(AVSContext *h) { h->flags = 0; } -static int decode_pic(AVSContext *h) { - MpegEncContext *s = &h->s; - int skip_count; - enum mb_t 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); - } - get_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)) - get_bits(&s->gb,16);//time_code - } - /* 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); - if(h->progressive) - h->pic_structure = 1; - else if(!(h->pic_structure = get_bits1(&s->gb) && (h->stc == PIC_PB_START_CODE)) ) - get_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; - } - check_for_slice(h); - if(h->pic_type == FF_I_TYPE) { - do { - decode_mb_i(h, 0); - } while(next_mb(h)); - } else if(h->pic_type == FF_P_TYPE) { - do { - if(h->skip_mode_flag) { - skip_count = get_ue_golomb(&s->gb); - while(skip_count--) { - decode_mb_p(h,P_SKIP); - if(!next_mb(h)) - goto done; - } - mb_type = get_ue_golomb(&s->gb) + P_16X16; - } else - mb_type = get_ue_golomb(&s->gb) + P_SKIP; - if(mb_type > P_8X8) { - decode_mb_i(h, mb_type - P_8X8 - 1); - } else - decode_mb_p(h,mb_type); - } while(next_mb(h)); - } else { /* FF_B_TYPE */ - do { - if(h->skip_mode_flag) { - skip_count = get_ue_golomb(&s->gb); - while(skip_count--) { - decode_mb_b(h,B_SKIP); - if(!next_mb(h)) - goto done; - } - mb_type = get_ue_golomb(&s->gb) + B_DIRECT; - } else - mb_type = get_ue_golomb(&s->gb) + B_SKIP; - if(mb_type > B_8X8) { - decode_mb_i(h, mb_type - B_8X8 - 1); - } else - decode_mb_b(h,mb_type); - } while(next_mb(h)); - } - done: - if(h->pic_type != FF_B_TYPE) { - if(h->DPB[1].data[0]) - s->avctx->release_buffer(s->avctx, (AVFrame *)&h->DPB[1]); - memcpy(&h->DPB[1], &h->DPB[0], sizeof(Picture)); - memcpy(&h->DPB[0], &h->picture, sizeof(Picture)); - memset(&h->picture,0,sizeof(Picture)); - } - return 0; -} - /***************************************************************************** * * headers and interface @@ -1007,114 +491,6 @@ void ff_cavs_init_top_lines(AVSContext *h) { h->block = av_mallocz(64*sizeof(DCTELEM)); } -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, - uint8_t * buf, int buf_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; - - 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_MIN_START_CODE && - stc <= SLICE_MAX_START_CODE) { - init_get_bits(&s->gb, buf_ptr, input_size); - decode_slice_header(h, &s->gb); - } - break; - } - } -} - int ff_cavs_init(AVCodecContext *avctx) { AVSContext *h = avctx->priv_data; MpegEncContext * const s = &h->s; @@ -1161,16 +537,3 @@ int ff_cavs_end(AVCodecContext *avctx) { av_free(h->block); return 0; } - -AVCodec cavs_decoder = { - "cavs", - CODEC_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, -}; diff --git a/libavcodec/cavsdata.h b/libavcodec/cavsdata.h index 745b3a140a..80b1e0ce0f 100644 --- a/libavcodec/cavsdata.h +++ b/libavcodec/cavsdata.h @@ -59,22 +59,6 @@ const uint8_t ff_cavs_partition_flags[30] = { const uint8_t ff_cavs_scan3x3[4] = {4,5,7,8}; -static const uint8_t mv_scan[4] = { - MV_FWD_X0,MV_FWD_X1, - MV_FWD_X2,MV_FWD_X3 -}; - -static const uint8_t cbp_tab[64][2] = { - {63, 0},{15,15},{31,63},{47,31},{ 0,16},{14,32},{13,47},{11,13}, - { 7,14},{ 5,11},{10,12},{ 8, 5},{12,10},{61, 7},{ 4,48},{55, 3}, - { 1, 2},{ 2, 8},{59, 4},{ 3, 1},{62,61},{ 9,55},{ 6,59},{29,62}, - {45,29},{51,27},{23,23},{39,19},{27,30},{46,28},{53, 9},{30, 6}, - {43,60},{37,21},{60,44},{16,26},{21,51},{28,35},{19,18},{35,20}, - {42,24},{26,53},{44,17},{32,37},{58,39},{24,45},{20,58},{17,43}, - {18,42},{48,46},{22,36},{33,33},{25,34},{49,40},{40,52},{36,49}, - {34,50},{50,56},{52,25},{54,22},{41,54},{56,57},{38,41},{57,38} -}; - const uint8_t ff_cavs_chroma_qp[64] = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9,10,11,12,13,14,15, 16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31, diff --git a/libavcodec/cavsdec.c b/libavcodec/cavsdec.c new file mode 100644 index 0000000000..77041e7feb --- /dev/null +++ b/libavcodec/cavsdec.c @@ -0,0 +1,702 @@ +/* + * Chinese AVS video (AVS1-P2, JiZhun profile) decoder. + * Copyright (c) 2006 Stefan Gehrer + * + * 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 cavs.c + * Chinese AVS video (AVS1-P2, JiZhun profile) decoder + * @author Stefan Gehrer + */ + +#include "avcodec.h" +#include "bitstream.h" +#include "golomb.h" +#include "cavs.h" + +static const uint8_t mv_scan[4] = { + MV_FWD_X0,MV_FWD_X1, + MV_FWD_X2,MV_FWD_X3 +}; + +static const uint8_t cbp_tab[64][2] = { + {63, 0},{15,15},{31,63},{47,31},{ 0,16},{14,32},{13,47},{11,13}, + { 7,14},{ 5,11},{10,12},{ 8, 5},{12,10},{61, 7},{ 4,48},{55, 3}, + { 1, 2},{ 2, 8},{59, 4},{ 3, 1},{62,61},{ 9,55},{ 6,59},{29,62}, + {45,29},{51,27},{23,23},{39,19},{27,30},{46,28},{53, 9},{30, 6}, + {43,60},{37,21},{60,44},{16,26},{21,51},{28,35},{19,18},{35,20}, + {42,24},{26,53},{44,17},{32,37},{58,39},{24,45},{20,58},{17,43}, + {18,42},{48,46},{22,36},{33,33},{25,34},{49,40},{40,52},{36,49}, + {34,50},{50,56},{52,25},{54,22},{41,54},{56,57},{38,41},{57,38} +}; + +/***************************************************************************** + * + * motion vector prediction + * + ****************************************************************************/ + +static inline void store_mvs(AVSContext *h) { + h->col_mv[(h->mby*h->mb_width + h->mbx)*4 + 0] = h->mv[MV_FWD_X0]; + h->col_mv[(h->mby*h->mb_width + h->mbx)*4 + 1] = h->mv[MV_FWD_X1]; + h->col_mv[(h->mby*h->mb_width + h->mbx)*4 + 2] = h->mv[MV_FWD_X2]; + h->col_mv[(h->mby*h->mb_width + h->mbx)*4 + 3] = h->mv[MV_FWD_X3]; +} + +static inline void mv_pred_direct(AVSContext *h, vector_t *pmv_fw, + vector_t *col_mv) { + vector_t *pmv_bw = pmv_fw + MV_BWD_OFFS; + int den = h->direct_den[col_mv->ref]; + int m = col_mv->x >> 31; + + pmv_fw->dist = h->dist[1]; + pmv_bw->dist = h->dist[0]; + pmv_fw->ref = 1; + pmv_bw->ref = 0; + /* scale the co-located motion vector according to its temporal span */ + pmv_fw->x = (((den+(den*col_mv->x*pmv_fw->dist^m)-m-1)>>14)^m)-m; + pmv_bw->x = m-(((den+(den*col_mv->x*pmv_bw->dist^m)-m-1)>>14)^m); + m = col_mv->y >> 31; + pmv_fw->y = (((den+(den*col_mv->y*pmv_fw->dist^m)-m-1)>>14)^m)-m; + pmv_bw->y = m-(((den+(den*col_mv->y*pmv_bw->dist^m)-m-1)>>14)^m); +} + +static inline void mv_pred_sym(AVSContext *h, vector_t *src, enum block_t size) { + vector_t *dst = src + MV_BWD_OFFS; + + /* backward mv is the scaled and negated forward mv */ + dst->x = -((src->x * h->sym_factor + 256) >> 9); + dst->y = -((src->y * h->sym_factor + 256) >> 9); + dst->ref = 0; + dst->dist = h->dist[0]; + set_mvs(dst, size); +} + +/***************************************************************************** + * + * residual data decoding + * + ****************************************************************************/ + +/** kth-order exponential golomb code */ +static inline int get_ue_code(GetBitContext *gb, int order) { + if(order) { + int ret = get_ue_golomb(gb) << order; + return ret + get_bits(gb,order); + } + return get_ue_golomb(gb); +} + +/** + * decode coefficients from one 8x8 block, dequantize, inverse transform + * and add them to sample block + * @param r pointer to 2D VLC table + * @param esc_golomb_order escape codes are k-golomb with this order k + * @param qp quantizer + * @param dst location of sample block + * @param stride line stride in frame buffer + */ +static int decode_residual_block(AVSContext *h, GetBitContext *gb, + const dec_2dvlc_t *r, int esc_golomb_order, + int qp, uint8_t *dst, int stride) { + int i, level_code, esc_code, level, run, mask; + DCTELEM level_buf[64]; + uint8_t run_buf[64]; + DCTELEM *block = h->block; + + for(i=0;i<65;i++) { + level_code = get_ue_code(gb,r->golomb_order); + if(level_code >= ESCAPE_CODE) { + run = ((level_code - ESCAPE_CODE) >> 1) + 1; + esc_code = get_ue_code(gb,esc_golomb_order); + level = esc_code + (run > r->max_run ? 1 : r->level_add[run]); + while(level > r->inc_limit) + r++; + mask = -(level_code & 1); + level = (level^mask) - mask; + } else { + level = r->rltab[level_code][0]; + if(!level) //end of block signal + break; + run = r->rltab[level_code][1]; + r += r->rltab[level_code][2]; + } + level_buf[i] = level; + run_buf[i] = run; + } + if(dequant(h,level_buf, run_buf, block, ff_cavs_dequant_mul[qp], + ff_cavs_dequant_shift[qp], i)) + return -1; + h->s.dsp.cavs_idct8_add(dst,block,stride); + return 0; +} + + +static inline void decode_residual_chroma(AVSContext *h) { + if(h->cbp & (1<<4)) + decode_residual_block(h,&h->s.gb,ff_cavs_chroma_dec,0, + ff_cavs_chroma_qp[h->qp],h->cu,h->c_stride); + if(h->cbp & (1<<5)) + decode_residual_block(h,&h->s.gb,ff_cavs_chroma_dec,0, + ff_cavs_chroma_qp[h->qp],h->cv,h->c_stride); +} + +static inline int decode_residual_inter(AVSContext *h) { + int block; + + /* get coded block pattern */ + int cbp= get_ue_golomb(&h->s.gb); + if(cbp > 63){ + av_log(h->s.avctx, AV_LOG_ERROR, "illegal inter cbp\n"); + return -1; + } + h->cbp = cbp_tab[cbp][1]; + + /* get quantizer */ + if(h->cbp && !h->qp_fixed) + h->qp = (h->qp + get_se_golomb(&h->s.gb)) & 63; + for(block=0;block<4;block++) + if(h->cbp & (1<s.gb,ff_cavs_inter_dec,0,h->qp, + h->cy + h->luma_scan[block], h->l_stride); + decode_residual_chroma(h); + + return 0; +} + +/***************************************************************************** + * + * macroblock level + * + ****************************************************************************/ + +static int decode_mb_i(AVSContext *h, int cbp_code) { + GetBitContext *gb = &h->s.gb; + int block, pred_mode_uv; + uint8_t top[18]; + uint8_t *left = NULL; + uint8_t *d; + + init_mb(h); + + /* get intra prediction modes from stream */ + for(block=0;block<4;block++) { + int nA,nB,predpred; + int pos = ff_cavs_scan3x3[block]; + + nA = h->pred_mode_Y[pos-1]; + nB = h->pred_mode_Y[pos-3]; + predpred = FFMIN(nA,nB); + if(predpred == NOT_AVAIL) // if either is not available + predpred = INTRA_L_LP; + if(!get_bits1(gb)){ + int rem_mode= get_bits(gb, 2); + predpred = rem_mode + (rem_mode >= predpred); + } + h->pred_mode_Y[pos] = predpred; + } + pred_mode_uv = get_ue_golomb(gb); + if(pred_mode_uv > 6) { + av_log(h->s.avctx, AV_LOG_ERROR, "illegal intra chroma pred mode\n"); + return -1; + } + modify_mb_i(h, &pred_mode_uv); + + /* get coded block pattern */ + if(h->pic_type == FF_I_TYPE) + cbp_code = get_ue_golomb(gb); + if(cbp_code > 63){ + av_log(h->s.avctx, AV_LOG_ERROR, "illegal intra cbp\n"); + return -1; + } + h->cbp = cbp_tab[cbp_code][0]; + if(h->cbp && !h->qp_fixed) + h->qp = (h->qp + get_se_golomb(gb)) & 63; //qp_delta + + /* luma intra prediction interleaved with residual decode/transform/add */ + for(block=0;block<4;block++) { + d = h->cy + h->luma_scan[block]; + load_intra_pred_luma(h, top, &left, block); + h->intra_pred_l[h->pred_mode_Y[ff_cavs_scan3x3[block]]] + (d, top, left, h->l_stride); + if(h->cbp & (1<qp,d,h->l_stride); + } + + /* chroma intra prediction */ + load_intra_pred_chroma(h); + h->intra_pred_c[pred_mode_uv](h->cu, &h->top_border_u[h->mbx*10], + h->left_border_u, h->c_stride); + h->intra_pred_c[pred_mode_uv](h->cv, &h->top_border_v[h->mbx*10], + h->left_border_v, h->c_stride); + + decode_residual_chroma(h); + ff_cavs_filter(h,I_8X8); + set_mv_intra(h); + return 0; +} + +static void decode_mb_p(AVSContext *h, enum mb_t mb_type) { + GetBitContext *gb = &h->s.gb; + int ref[4]; + + init_mb(h); + switch(mb_type) { + case P_SKIP: + ff_cavs_mv(h, MV_FWD_X0, MV_FWD_C2, MV_PRED_PSKIP, BLK_16X16, 0); + break; + case P_16X16: + ref[0] = h->ref_flag ? 0 : get_bits1(gb); + ff_cavs_mv(h, MV_FWD_X0, MV_FWD_C2, MV_PRED_MEDIAN, BLK_16X16,ref[0]); + break; + case P_16X8: + ref[0] = h->ref_flag ? 0 : get_bits1(gb); + ref[2] = h->ref_flag ? 0 : get_bits1(gb); + ff_cavs_mv(h, MV_FWD_X0, MV_FWD_C2, MV_PRED_TOP, BLK_16X8, ref[0]); + ff_cavs_mv(h, MV_FWD_X2, MV_FWD_A1, MV_PRED_LEFT, BLK_16X8, ref[2]); + break; + case P_8X16: + ref[0] = h->ref_flag ? 0 : get_bits1(gb); + ref[1] = h->ref_flag ? 0 : get_bits1(gb); + ff_cavs_mv(h, MV_FWD_X0, MV_FWD_B3, MV_PRED_LEFT, BLK_8X16, ref[0]); + ff_cavs_mv(h, MV_FWD_X1, MV_FWD_C2, MV_PRED_TOPRIGHT,BLK_8X16, ref[1]); + break; + case P_8X8: + ref[0] = h->ref_flag ? 0 : get_bits1(gb); + ref[1] = h->ref_flag ? 0 : get_bits1(gb); + ref[2] = h->ref_flag ? 0 : get_bits1(gb); + ref[3] = h->ref_flag ? 0 : get_bits1(gb); + ff_cavs_mv(h, MV_FWD_X0, MV_FWD_B3, MV_PRED_MEDIAN, BLK_8X8, ref[0]); + ff_cavs_mv(h, MV_FWD_X1, MV_FWD_C2, MV_PRED_MEDIAN, BLK_8X8, ref[1]); + ff_cavs_mv(h, MV_FWD_X2, MV_FWD_X1, MV_PRED_MEDIAN, BLK_8X8, ref[2]); + ff_cavs_mv(h, MV_FWD_X3, MV_FWD_X0, MV_PRED_MEDIAN, BLK_8X8, ref[3]); + } + ff_cavs_inter(h, mb_type); + set_intra_mode_default(h); + store_mvs(h); + if(mb_type != P_SKIP) + decode_residual_inter(h); + ff_cavs_filter(h,mb_type); + *h->col_type = mb_type; +} + +static void decode_mb_b(AVSContext *h, enum mb_t mb_type) { + int block; + enum sub_mb_t sub_type[4]; + int flags; + + init_mb(h); + + /* reset all MVs */ + h->mv[MV_FWD_X0] = ff_cavs_dir_mv; + set_mvs(&h->mv[MV_FWD_X0], BLK_16X16); + h->mv[MV_BWD_X0] = ff_cavs_dir_mv; + set_mvs(&h->mv[MV_BWD_X0], BLK_16X16); + switch(mb_type) { + case B_SKIP: + case B_DIRECT: + if(!(*h->col_type)) { + /* intra MB at co-location, do in-plane prediction */ + ff_cavs_mv(h, MV_FWD_X0, MV_FWD_C2, MV_PRED_BSKIP, BLK_16X16, 1); + ff_cavs_mv(h, MV_BWD_X0, MV_BWD_C2, MV_PRED_BSKIP, BLK_16X16, 0); + } else + /* direct prediction from co-located P MB, block-wise */ + for(block=0;block<4;block++) + mv_pred_direct(h,&h->mv[mv_scan[block]], + &h->col_mv[(h->mby*h->mb_width+h->mbx)*4 + block]); + break; + case B_FWD_16X16: + ff_cavs_mv(h, MV_FWD_X0, MV_FWD_C2, MV_PRED_MEDIAN, BLK_16X16, 1); + break; + case B_SYM_16X16: + ff_cavs_mv(h, MV_FWD_X0, MV_FWD_C2, MV_PRED_MEDIAN, BLK_16X16, 1); + mv_pred_sym(h, &h->mv[MV_FWD_X0], BLK_16X16); + break; + case B_BWD_16X16: + ff_cavs_mv(h, MV_BWD_X0, MV_BWD_C2, MV_PRED_MEDIAN, BLK_16X16, 0); + break; + case B_8X8: + for(block=0;block<4;block++) + sub_type[block] = get_bits(&h->s.gb,2); + for(block=0;block<4;block++) { + switch(sub_type[block]) { + case B_SUB_DIRECT: + if(!(*h->col_type)) { + /* intra MB at co-location, do in-plane prediction */ + ff_cavs_mv(h, mv_scan[block], mv_scan[block]-3, + MV_PRED_BSKIP, BLK_8X8, 1); + ff_cavs_mv(h, mv_scan[block]+MV_BWD_OFFS, + mv_scan[block]-3+MV_BWD_OFFS, + MV_PRED_BSKIP, BLK_8X8, 0); + } else + mv_pred_direct(h,&h->mv[mv_scan[block]], + &h->col_mv[(h->mby*h->mb_width + h->mbx)*4 + block]); + break; + case B_SUB_FWD: + ff_cavs_mv(h, mv_scan[block], mv_scan[block]-3, + MV_PRED_MEDIAN, BLK_8X8, 1); + break; + case B_SUB_SYM: + ff_cavs_mv(h, mv_scan[block], mv_scan[block]-3, + MV_PRED_MEDIAN, BLK_8X8, 1); + mv_pred_sym(h, &h->mv[mv_scan[block]], BLK_8X8); + break; + } + } + for(block=0;block<4;block++) { + if(sub_type[block] == B_SUB_BWD) + ff_cavs_mv(h, mv_scan[block]+MV_BWD_OFFS, + mv_scan[block]+MV_BWD_OFFS-3, + MV_PRED_MEDIAN, BLK_8X8, 0); + } + break; + default: + assert((mb_type > B_SYM_16X16) && (mb_type < B_8X8)); + flags = ff_cavs_partition_flags[mb_type]; + if(mb_type & 1) { /* 16x8 macroblock types */ + if(flags & FWD0) + ff_cavs_mv(h, MV_FWD_X0, MV_FWD_C2, MV_PRED_TOP, BLK_16X8, 1); + if(flags & SYM0) + mv_pred_sym(h, &h->mv[MV_FWD_X0], BLK_16X8); + if(flags & FWD1) + ff_cavs_mv(h, MV_FWD_X2, MV_FWD_A1, MV_PRED_LEFT, BLK_16X8, 1); + if(flags & SYM1) + mv_pred_sym(h, &h->mv[MV_FWD_X2], BLK_16X8); + if(flags & BWD0) + ff_cavs_mv(h, MV_BWD_X0, MV_BWD_C2, MV_PRED_TOP, BLK_16X8, 0); + if(flags & BWD1) + ff_cavs_mv(h, MV_BWD_X2, MV_BWD_A1, MV_PRED_LEFT, BLK_16X8, 0); + } else { /* 8x16 macroblock types */ + if(flags & FWD0) + ff_cavs_mv(h, MV_FWD_X0, MV_FWD_B3, MV_PRED_LEFT, BLK_8X16, 1); + if(flags & SYM0) + 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; + 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 void check_for_slice(AVSContext *h) { + GetBitContext *gb = &h->s.gb; + int align; + align = (-get_bits_count(gb)) & 7; + if((show_bits_long(gb,24+align) & 0xFFFFFF) == 0x000001) { + get_bits_long(gb,24+align); + h->stc = get_bits(gb,8); + decode_slice_header(h,gb); + } +} + +/***************************************************************************** + * + * frame level + * + ****************************************************************************/ + +static int decode_pic(AVSContext *h) { + MpegEncContext *s = &h->s; + int skip_count; + enum mb_t 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); + } + get_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)) + get_bits(&s->gb,16);//time_code + } + /* 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); + if(h->progressive) + h->pic_structure = 1; + else if(!(h->pic_structure = get_bits1(&s->gb) && (h->stc == PIC_PB_START_CODE)) ) + get_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; + } + check_for_slice(h); + if(h->pic_type == FF_I_TYPE) { + do { + decode_mb_i(h, 0); + } while(next_mb(h)); + } else if(h->pic_type == FF_P_TYPE) { + do { + if(h->skip_mode_flag) { + skip_count = get_ue_golomb(&s->gb); + while(skip_count--) { + decode_mb_p(h,P_SKIP); + if(!next_mb(h)) + goto done; + } + mb_type = get_ue_golomb(&s->gb) + P_16X16; + } else + mb_type = get_ue_golomb(&s->gb) + P_SKIP; + if(mb_type > P_8X8) { + decode_mb_i(h, mb_type - P_8X8 - 1); + } else + decode_mb_p(h,mb_type); + } while(next_mb(h)); + } else { /* FF_B_TYPE */ + do { + if(h->skip_mode_flag) { + skip_count = get_ue_golomb(&s->gb); + while(skip_count--) { + decode_mb_b(h,B_SKIP); + if(!next_mb(h)) + goto done; + } + mb_type = get_ue_golomb(&s->gb) + B_DIRECT; + } else + mb_type = get_ue_golomb(&s->gb) + B_SKIP; + if(mb_type > B_8X8) { + decode_mb_i(h, mb_type - B_8X8 - 1); + } else + decode_mb_b(h,mb_type); + } while(next_mb(h)); + } + done: + if(h->pic_type != FF_B_TYPE) { + if(h->DPB[1].data[0]) + s->avctx->release_buffer(s->avctx, (AVFrame *)&h->DPB[1]); + memcpy(&h->DPB[1], &h->DPB[0], sizeof(Picture)); + memcpy(&h->DPB[0], &h->picture, sizeof(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, + uint8_t * buf, int buf_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; + + 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_MIN_START_CODE && + stc <= SLICE_MAX_START_CODE) { + init_get_bits(&s->gb, buf_ptr, input_size); + decode_slice_header(h, &s->gb); + } + break; + } + } +} + +AVCodec cavs_decoder = { + "cavs", + CODEC_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, +};