| /* |
| * Copyright (C) 2004 Michael Niedermayer <michaelni@gmx.at> |
| * |
| * 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 |
| */ |
| |
| #include "libavutil/intmath.h" |
| #include "libavutil/log.h" |
| #include "libavutil/opt.h" |
| #include "avcodec.h" |
| #include "snow_dwt.h" |
| #include "internal.h" |
| #include "snow.h" |
| |
| #include "rangecoder.h" |
| #include "mathops.h" |
| |
| #include "mpegvideo.h" |
| #include "h263.h" |
| |
| static av_always_inline void predict_slice_buffered(SnowContext *s, slice_buffer * sb, IDWTELEM * old_buffer, int plane_index, int add, int mb_y){ |
| Plane *p= &s->plane[plane_index]; |
| const int mb_w= s->b_width << s->block_max_depth; |
| const int mb_h= s->b_height << s->block_max_depth; |
| int x, y, mb_x; |
| int block_size = MB_SIZE >> s->block_max_depth; |
| int block_w = plane_index ? block_size>>s->chroma_h_shift : block_size; |
| int block_h = plane_index ? block_size>>s->chroma_v_shift : block_size; |
| const uint8_t *obmc = plane_index ? ff_obmc_tab[s->block_max_depth+s->chroma_h_shift] : ff_obmc_tab[s->block_max_depth]; |
| int obmc_stride= plane_index ? (2*block_size)>>s->chroma_h_shift : 2*block_size; |
| int ref_stride= s->current_picture->linesize[plane_index]; |
| uint8_t *dst8= s->current_picture->data[plane_index]; |
| int w= p->width; |
| int h= p->height; |
| |
| if(s->keyframe || (s->avctx->debug&512)){ |
| if(mb_y==mb_h) |
| return; |
| |
| if(add){ |
| for(y=block_h*mb_y; y<FFMIN(h,block_h*(mb_y+1)); y++){ |
| // DWTELEM * line = slice_buffer_get_line(sb, y); |
| IDWTELEM * line = sb->line[y]; |
| for(x=0; x<w; x++){ |
| // int v= buf[x + y*w] + (128<<FRAC_BITS) + (1<<(FRAC_BITS-1)); |
| int v= line[x] + (128<<FRAC_BITS) + (1<<(FRAC_BITS-1)); |
| v >>= FRAC_BITS; |
| if(v&(~255)) v= ~(v>>31); |
| dst8[x + y*ref_stride]= v; |
| } |
| } |
| }else{ |
| for(y=block_h*mb_y; y<FFMIN(h,block_h*(mb_y+1)); y++){ |
| // DWTELEM * line = slice_buffer_get_line(sb, y); |
| IDWTELEM * line = sb->line[y]; |
| for(x=0; x<w; x++){ |
| line[x] -= 128 << FRAC_BITS; |
| // buf[x + y*w]-= 128<<FRAC_BITS; |
| } |
| } |
| } |
| |
| return; |
| } |
| |
| for(mb_x=0; mb_x<=mb_w; mb_x++){ |
| add_yblock(s, 1, sb, old_buffer, dst8, obmc, |
| block_w*mb_x - block_w/2, |
| block_h*mb_y - block_h/2, |
| block_w, block_h, |
| w, h, |
| w, ref_stride, obmc_stride, |
| mb_x - 1, mb_y - 1, |
| add, 0, plane_index); |
| } |
| |
| if(s->avmv && mb_y < mb_h && plane_index == 0) |
| for(mb_x=0; mb_x<mb_w; mb_x++){ |
| AVMotionVector *avmv = s->avmv + s->avmv_index; |
| const int b_width = s->b_width << s->block_max_depth; |
| const int b_stride= b_width; |
| BlockNode *bn= &s->block[mb_x + mb_y*b_stride]; |
| |
| if (bn->type) |
| continue; |
| |
| s->avmv_index++; |
| |
| avmv->w = block_w; |
| avmv->h = block_h; |
| avmv->dst_x = block_w*mb_x - block_w/2; |
| avmv->dst_y = block_h*mb_y - block_h/2; |
| avmv->motion_scale = 8; |
| avmv->motion_x = bn->mx * s->mv_scale; |
| avmv->motion_y = bn->my * s->mv_scale; |
| avmv->src_x = avmv->dst_x + avmv->motion_x / 8; |
| avmv->src_y = avmv->dst_y + avmv->motion_y / 8; |
| avmv->source= -1 - bn->ref; |
| avmv->flags = 0; |
| } |
| } |
| |
| static inline void decode_subband_slice_buffered(SnowContext *s, SubBand *b, slice_buffer * sb, int start_y, int h, int save_state[1]){ |
| const int w= b->width; |
| int y; |
| const int qlog= av_clip(s->qlog + b->qlog, 0, QROOT*16); |
| int qmul= ff_qexp[qlog&(QROOT-1)]<<(qlog>>QSHIFT); |
| int qadd= (s->qbias*qmul)>>QBIAS_SHIFT; |
| int new_index = 0; |
| |
| if(b->ibuf == s->spatial_idwt_buffer || s->qlog == LOSSLESS_QLOG){ |
| qadd= 0; |
| qmul= 1<<QEXPSHIFT; |
| } |
| |
| /* If we are on the second or later slice, restore our index. */ |
| if (start_y != 0) |
| new_index = save_state[0]; |
| |
| |
| for(y=start_y; y<h; y++){ |
| int x = 0; |
| int v; |
| IDWTELEM * line = slice_buffer_get_line(sb, y * b->stride_line + b->buf_y_offset) + b->buf_x_offset; |
| memset(line, 0, b->width*sizeof(IDWTELEM)); |
| v = b->x_coeff[new_index].coeff; |
| x = b->x_coeff[new_index++].x; |
| while(x < w){ |
| register int t= ( (v>>1)*qmul + qadd)>>QEXPSHIFT; |
| register int u= -(v&1); |
| line[x] = (t^u) - u; |
| |
| v = b->x_coeff[new_index].coeff; |
| x = b->x_coeff[new_index++].x; |
| } |
| } |
| |
| /* Save our variables for the next slice. */ |
| save_state[0] = new_index; |
| |
| return; |
| } |
| |
| static int decode_q_branch(SnowContext *s, int level, int x, int y){ |
| const int w= s->b_width << s->block_max_depth; |
| const int rem_depth= s->block_max_depth - level; |
| const int index= (x + y*w) << rem_depth; |
| int trx= (x+1)<<rem_depth; |
| const BlockNode *left = x ? &s->block[index-1] : &null_block; |
| const BlockNode *top = y ? &s->block[index-w] : &null_block; |
| const BlockNode *tl = y && x ? &s->block[index-w-1] : left; |
| const BlockNode *tr = y && trx<w && ((x&1)==0 || level==0) ? &s->block[index-w+(1<<rem_depth)] : tl; //FIXME use lt |
| int s_context= 2*left->level + 2*top->level + tl->level + tr->level; |
| int res; |
| |
| if(s->keyframe){ |
| set_blocks(s, level, x, y, null_block.color[0], null_block.color[1], null_block.color[2], null_block.mx, null_block.my, null_block.ref, BLOCK_INTRA); |
| return 0; |
| } |
| |
| if(level==s->block_max_depth || get_rac(&s->c, &s->block_state[4 + s_context])){ |
| int type, mx, my; |
| int l = left->color[0]; |
| int cb= left->color[1]; |
| int cr= left->color[2]; |
| unsigned ref = 0; |
| int ref_context= av_log2(2*left->ref) + av_log2(2*top->ref); |
| int mx_context= av_log2(2*FFABS(left->mx - top->mx)) + 0*av_log2(2*FFABS(tr->mx - top->mx)); |
| int my_context= av_log2(2*FFABS(left->my - top->my)) + 0*av_log2(2*FFABS(tr->my - top->my)); |
| |
| type= get_rac(&s->c, &s->block_state[1 + left->type + top->type]) ? BLOCK_INTRA : 0; |
| |
| if(type){ |
| pred_mv(s, &mx, &my, 0, left, top, tr); |
| l += get_symbol(&s->c, &s->block_state[32], 1); |
| if (s->nb_planes > 2) { |
| cb+= get_symbol(&s->c, &s->block_state[64], 1); |
| cr+= get_symbol(&s->c, &s->block_state[96], 1); |
| } |
| }else{ |
| if(s->ref_frames > 1) |
| ref= get_symbol(&s->c, &s->block_state[128 + 1024 + 32*ref_context], 0); |
| if (ref >= s->ref_frames) { |
| av_log(s->avctx, AV_LOG_ERROR, "Invalid ref\n"); |
| return AVERROR_INVALIDDATA; |
| } |
| pred_mv(s, &mx, &my, ref, left, top, tr); |
| mx+= get_symbol(&s->c, &s->block_state[128 + 32*(mx_context + 16*!!ref)], 1); |
| my+= get_symbol(&s->c, &s->block_state[128 + 32*(my_context + 16*!!ref)], 1); |
| } |
| set_blocks(s, level, x, y, l, cb, cr, mx, my, ref, type); |
| }else{ |
| if ((res = decode_q_branch(s, level+1, 2*x+0, 2*y+0)) < 0 || |
| (res = decode_q_branch(s, level+1, 2*x+1, 2*y+0)) < 0 || |
| (res = decode_q_branch(s, level+1, 2*x+0, 2*y+1)) < 0 || |
| (res = decode_q_branch(s, level+1, 2*x+1, 2*y+1)) < 0) |
| return res; |
| } |
| return 0; |
| } |
| |
| static void dequantize_slice_buffered(SnowContext *s, slice_buffer * sb, SubBand *b, IDWTELEM *src, int stride, int start_y, int end_y){ |
| const int w= b->width; |
| const int qlog= av_clip(s->qlog + b->qlog, 0, QROOT*16); |
| const int qmul= ff_qexp[qlog&(QROOT-1)]<<(qlog>>QSHIFT); |
| const int qadd= (s->qbias*qmul)>>QBIAS_SHIFT; |
| int x,y; |
| |
| if(s->qlog == LOSSLESS_QLOG) return; |
| |
| for(y=start_y; y<end_y; y++){ |
| // DWTELEM * line = slice_buffer_get_line_from_address(sb, src + (y * stride)); |
| IDWTELEM * line = slice_buffer_get_line(sb, (y * b->stride_line) + b->buf_y_offset) + b->buf_x_offset; |
| for(x=0; x<w; x++){ |
| int i= line[x]; |
| if(i<0){ |
| line[x]= -((-i*qmul + qadd)>>(QEXPSHIFT)); //FIXME try different bias |
| }else if(i>0){ |
| line[x]= (( i*qmul + qadd)>>(QEXPSHIFT)); |
| } |
| } |
| } |
| } |
| |
| static void correlate_slice_buffered(SnowContext *s, slice_buffer * sb, SubBand *b, IDWTELEM *src, int stride, int inverse, int use_median, int start_y, int end_y){ |
| const int w= b->width; |
| int x,y; |
| |
| IDWTELEM * line=0; // silence silly "could be used without having been initialized" warning |
| IDWTELEM * prev; |
| |
| if (start_y != 0) |
| line = slice_buffer_get_line(sb, ((start_y - 1) * b->stride_line) + b->buf_y_offset) + b->buf_x_offset; |
| |
| for(y=start_y; y<end_y; y++){ |
| prev = line; |
| // line = slice_buffer_get_line_from_address(sb, src + (y * stride)); |
| line = slice_buffer_get_line(sb, (y * b->stride_line) + b->buf_y_offset) + b->buf_x_offset; |
| for(x=0; x<w; x++){ |
| if(x){ |
| if(use_median){ |
| if(y && x+1<w) line[x] += mid_pred(line[x - 1], prev[x], prev[x + 1]); |
| else line[x] += line[x - 1]; |
| }else{ |
| if(y) line[x] += mid_pred(line[x - 1], prev[x], line[x - 1] + prev[x] - prev[x - 1]); |
| else line[x] += line[x - 1]; |
| } |
| }else{ |
| if(y) line[x] += prev[x]; |
| } |
| } |
| } |
| } |
| |
| static void decode_qlogs(SnowContext *s){ |
| int plane_index, level, orientation; |
| |
| for(plane_index=0; plane_index < s->nb_planes; plane_index++){ |
| for(level=0; level<s->spatial_decomposition_count; level++){ |
| for(orientation=level ? 1:0; orientation<4; orientation++){ |
| int q; |
| if (plane_index==2) q= s->plane[1].band[level][orientation].qlog; |
| else if(orientation==2) q= s->plane[plane_index].band[level][1].qlog; |
| else q= get_symbol(&s->c, s->header_state, 1); |
| s->plane[plane_index].band[level][orientation].qlog= q; |
| } |
| } |
| } |
| } |
| |
| #define GET_S(dst, check) \ |
| tmp= get_symbol(&s->c, s->header_state, 0);\ |
| if(!(check)){\ |
| av_log(s->avctx, AV_LOG_ERROR, "Error " #dst " is %d\n", tmp);\ |
| return AVERROR_INVALIDDATA;\ |
| }\ |
| dst= tmp; |
| |
| static int decode_header(SnowContext *s){ |
| int plane_index, tmp; |
| uint8_t kstate[32]; |
| |
| memset(kstate, MID_STATE, sizeof(kstate)); |
| |
| s->keyframe= get_rac(&s->c, kstate); |
| if(s->keyframe || s->always_reset){ |
| ff_snow_reset_contexts(s); |
| s->spatial_decomposition_type= |
| s->qlog= |
| s->qbias= |
| s->mv_scale= |
| s->block_max_depth= 0; |
| } |
| if(s->keyframe){ |
| GET_S(s->version, tmp <= 0U) |
| s->always_reset= get_rac(&s->c, s->header_state); |
| s->temporal_decomposition_type= get_symbol(&s->c, s->header_state, 0); |
| s->temporal_decomposition_count= get_symbol(&s->c, s->header_state, 0); |
| GET_S(s->spatial_decomposition_count, 0 < tmp && tmp <= MAX_DECOMPOSITIONS) |
| s->colorspace_type= get_symbol(&s->c, s->header_state, 0); |
| if (s->colorspace_type == 1) { |
| s->avctx->pix_fmt= AV_PIX_FMT_GRAY8; |
| s->nb_planes = 1; |
| } else if(s->colorspace_type == 0) { |
| s->chroma_h_shift= get_symbol(&s->c, s->header_state, 0); |
| s->chroma_v_shift= get_symbol(&s->c, s->header_state, 0); |
| |
| if(s->chroma_h_shift == 1 && s->chroma_v_shift==1){ |
| s->avctx->pix_fmt= AV_PIX_FMT_YUV420P; |
| }else if(s->chroma_h_shift == 0 && s->chroma_v_shift==0){ |
| s->avctx->pix_fmt= AV_PIX_FMT_YUV444P; |
| }else if(s->chroma_h_shift == 2 && s->chroma_v_shift==2){ |
| s->avctx->pix_fmt= AV_PIX_FMT_YUV410P; |
| } else { |
| av_log(s, AV_LOG_ERROR, "unsupported color subsample mode %d %d\n", s->chroma_h_shift, s->chroma_v_shift); |
| s->chroma_h_shift = s->chroma_v_shift = 1; |
| s->avctx->pix_fmt= AV_PIX_FMT_YUV420P; |
| return AVERROR_INVALIDDATA; |
| } |
| s->nb_planes = 3; |
| } else { |
| av_log(s, AV_LOG_ERROR, "unsupported color space\n"); |
| s->chroma_h_shift = s->chroma_v_shift = 1; |
| s->avctx->pix_fmt= AV_PIX_FMT_YUV420P; |
| return AVERROR_INVALIDDATA; |
| } |
| |
| |
| s->spatial_scalability= get_rac(&s->c, s->header_state); |
| // s->rate_scalability= get_rac(&s->c, s->header_state); |
| GET_S(s->max_ref_frames, tmp < (unsigned)MAX_REF_FRAMES) |
| s->max_ref_frames++; |
| |
| decode_qlogs(s); |
| } |
| |
| if(!s->keyframe){ |
| if(get_rac(&s->c, s->header_state)){ |
| for(plane_index=0; plane_index<FFMIN(s->nb_planes, 2); plane_index++){ |
| int htaps, i, sum=0; |
| Plane *p= &s->plane[plane_index]; |
| p->diag_mc= get_rac(&s->c, s->header_state); |
| htaps= get_symbol(&s->c, s->header_state, 0)*2 + 2; |
| if((unsigned)htaps > HTAPS_MAX || htaps==0) |
| return AVERROR_INVALIDDATA; |
| p->htaps= htaps; |
| for(i= htaps/2; i; i--){ |
| p->hcoeff[i]= get_symbol(&s->c, s->header_state, 0) * (1-2*(i&1)); |
| sum += p->hcoeff[i]; |
| } |
| p->hcoeff[0]= 32-sum; |
| } |
| s->plane[2].diag_mc= s->plane[1].diag_mc; |
| s->plane[2].htaps = s->plane[1].htaps; |
| memcpy(s->plane[2].hcoeff, s->plane[1].hcoeff, sizeof(s->plane[1].hcoeff)); |
| } |
| if(get_rac(&s->c, s->header_state)){ |
| GET_S(s->spatial_decomposition_count, 0 < tmp && tmp <= MAX_DECOMPOSITIONS) |
| decode_qlogs(s); |
| } |
| } |
| |
| s->spatial_decomposition_type+= get_symbol(&s->c, s->header_state, 1); |
| if(s->spatial_decomposition_type > 1U){ |
| av_log(s->avctx, AV_LOG_ERROR, "spatial_decomposition_type %d not supported\n", s->spatial_decomposition_type); |
| return AVERROR_INVALIDDATA; |
| } |
| if(FFMIN(s->avctx-> width>>s->chroma_h_shift, |
| s->avctx->height>>s->chroma_v_shift) >> (s->spatial_decomposition_count-1) <= 1){ |
| av_log(s->avctx, AV_LOG_ERROR, "spatial_decomposition_count %d too large for size\n", s->spatial_decomposition_count); |
| return AVERROR_INVALIDDATA; |
| } |
| |
| |
| s->qlog += get_symbol(&s->c, s->header_state, 1); |
| s->mv_scale += get_symbol(&s->c, s->header_state, 1); |
| s->qbias += get_symbol(&s->c, s->header_state, 1); |
| s->block_max_depth+= get_symbol(&s->c, s->header_state, 1); |
| if(s->block_max_depth > 1 || s->block_max_depth < 0){ |
| av_log(s->avctx, AV_LOG_ERROR, "block_max_depth= %d is too large\n", s->block_max_depth); |
| s->block_max_depth= 0; |
| return AVERROR_INVALIDDATA; |
| } |
| |
| return 0; |
| } |
| |
| static av_cold int decode_init(AVCodecContext *avctx) |
| { |
| int ret; |
| |
| if ((ret = ff_snow_common_init(avctx)) < 0) { |
| return ret; |
| } |
| |
| return 0; |
| } |
| |
| static int decode_blocks(SnowContext *s){ |
| int x, y; |
| int w= s->b_width; |
| int h= s->b_height; |
| int res; |
| |
| for(y=0; y<h; y++){ |
| for(x=0; x<w; x++){ |
| if ((res = decode_q_branch(s, 0, x, y)) < 0) |
| return res; |
| } |
| } |
| return 0; |
| } |
| |
| static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame, |
| AVPacket *avpkt) |
| { |
| const uint8_t *buf = avpkt->data; |
| int buf_size = avpkt->size; |
| SnowContext *s = avctx->priv_data; |
| RangeCoder * const c= &s->c; |
| int bytes_read; |
| AVFrame *picture = data; |
| int level, orientation, plane_index; |
| int res; |
| |
| ff_init_range_decoder(c, buf, buf_size); |
| ff_build_rac_states(c, 0.05*(1LL<<32), 256-8); |
| |
| s->current_picture->pict_type= AV_PICTURE_TYPE_I; //FIXME I vs. P |
| if ((res = decode_header(s)) < 0) |
| return res; |
| if ((res=ff_snow_common_init_after_header(avctx)) < 0) |
| return res; |
| |
| // realloc slice buffer for the case that spatial_decomposition_count changed |
| ff_slice_buffer_destroy(&s->sb); |
| if ((res = ff_slice_buffer_init(&s->sb, s->plane[0].height, |
| (MB_SIZE >> s->block_max_depth) + |
| s->spatial_decomposition_count * 11 + 1, |
| s->plane[0].width, |
| s->spatial_idwt_buffer)) < 0) |
| return res; |
| |
| for(plane_index=0; plane_index < s->nb_planes; plane_index++){ |
| Plane *p= &s->plane[plane_index]; |
| p->fast_mc= p->diag_mc && p->htaps==6 && p->hcoeff[0]==40 |
| && p->hcoeff[1]==-10 |
| && p->hcoeff[2]==2; |
| } |
| |
| ff_snow_alloc_blocks(s); |
| |
| if((res = ff_snow_frame_start(s)) < 0) |
| return res; |
| |
| s->current_picture->pict_type = s->keyframe ? AV_PICTURE_TYPE_I : AV_PICTURE_TYPE_P; |
| |
| //keyframe flag duplication mess FIXME |
| if(avctx->debug&FF_DEBUG_PICT_INFO) |
| av_log(avctx, AV_LOG_ERROR, |
| "keyframe:%d qlog:%d qbias: %d mvscale: %d " |
| "decomposition_type:%d decomposition_count:%d\n", |
| s->keyframe, s->qlog, s->qbias, s->mv_scale, |
| s->spatial_decomposition_type, |
| s->spatial_decomposition_count |
| ); |
| |
| av_assert0(!s->avmv); |
| if (s->avctx->flags2 & AV_CODEC_FLAG2_EXPORT_MVS) { |
| s->avmv = av_malloc_array(s->b_width * s->b_height, sizeof(AVMotionVector) << (s->block_max_depth*2)); |
| } |
| s->avmv_index = 0; |
| |
| if ((res = decode_blocks(s)) < 0) |
| return res; |
| |
| for(plane_index=0; plane_index < s->nb_planes; plane_index++){ |
| Plane *p= &s->plane[plane_index]; |
| int w= p->width; |
| int h= p->height; |
| int x, y; |
| int decode_state[MAX_DECOMPOSITIONS][4][1]; /* Stored state info for unpack_coeffs. 1 variable per instance. */ |
| |
| if(s->avctx->debug&2048){ |
| memset(s->spatial_dwt_buffer, 0, sizeof(DWTELEM)*w*h); |
| predict_plane(s, s->spatial_idwt_buffer, plane_index, 1); |
| |
| for(y=0; y<h; y++){ |
| for(x=0; x<w; x++){ |
| int v= s->current_picture->data[plane_index][y*s->current_picture->linesize[plane_index] + x]; |
| s->mconly_picture->data[plane_index][y*s->mconly_picture->linesize[plane_index] + x]= v; |
| } |
| } |
| } |
| |
| { |
| for(level=0; level<s->spatial_decomposition_count; level++){ |
| for(orientation=level ? 1 : 0; orientation<4; orientation++){ |
| SubBand *b= &p->band[level][orientation]; |
| unpack_coeffs(s, b, b->parent, orientation); |
| } |
| } |
| } |
| |
| { |
| const int mb_h= s->b_height << s->block_max_depth; |
| const int block_size = MB_SIZE >> s->block_max_depth; |
| const int block_h = plane_index ? block_size>>s->chroma_v_shift : block_size; |
| int mb_y; |
| DWTCompose cs[MAX_DECOMPOSITIONS]; |
| int yd=0, yq=0; |
| int y; |
| int end_y; |
| |
| ff_spatial_idwt_buffered_init(cs, &s->sb, w, h, 1, s->spatial_decomposition_type, s->spatial_decomposition_count); |
| for(mb_y=0; mb_y<=mb_h; mb_y++){ |
| |
| int slice_starty = block_h*mb_y; |
| int slice_h = block_h*(mb_y+1); |
| |
| if (!(s->keyframe || s->avctx->debug&512)){ |
| slice_starty = FFMAX(0, slice_starty - (block_h >> 1)); |
| slice_h -= (block_h >> 1); |
| } |
| |
| for(level=0; level<s->spatial_decomposition_count; level++){ |
| for(orientation=level ? 1 : 0; orientation<4; orientation++){ |
| SubBand *b= &p->band[level][orientation]; |
| int start_y; |
| int end_y; |
| int our_mb_start = mb_y; |
| int our_mb_end = (mb_y + 1); |
| const int extra= 3; |
| start_y = (mb_y ? ((block_h * our_mb_start) >> (s->spatial_decomposition_count - level)) + s->spatial_decomposition_count - level + extra: 0); |
| end_y = (((block_h * our_mb_end) >> (s->spatial_decomposition_count - level)) + s->spatial_decomposition_count - level + extra); |
| if (!(s->keyframe || s->avctx->debug&512)){ |
| start_y = FFMAX(0, start_y - (block_h >> (1+s->spatial_decomposition_count - level))); |
| end_y = FFMAX(0, end_y - (block_h >> (1+s->spatial_decomposition_count - level))); |
| } |
| start_y = FFMIN(b->height, start_y); |
| end_y = FFMIN(b->height, end_y); |
| |
| if (start_y != end_y){ |
| if (orientation == 0){ |
| SubBand * correlate_band = &p->band[0][0]; |
| int correlate_end_y = FFMIN(b->height, end_y + 1); |
| int correlate_start_y = FFMIN(b->height, (start_y ? start_y + 1 : 0)); |
| decode_subband_slice_buffered(s, correlate_band, &s->sb, correlate_start_y, correlate_end_y, decode_state[0][0]); |
| correlate_slice_buffered(s, &s->sb, correlate_band, correlate_band->ibuf, correlate_band->stride, 1, 0, correlate_start_y, correlate_end_y); |
| dequantize_slice_buffered(s, &s->sb, correlate_band, correlate_band->ibuf, correlate_band->stride, start_y, end_y); |
| } |
| else |
| decode_subband_slice_buffered(s, b, &s->sb, start_y, end_y, decode_state[level][orientation]); |
| } |
| } |
| } |
| |
| for(; yd<slice_h; yd+=4){ |
| ff_spatial_idwt_buffered_slice(&s->dwt, cs, &s->sb, s->temp_idwt_buffer, w, h, 1, s->spatial_decomposition_type, s->spatial_decomposition_count, yd); |
| } |
| |
| if(s->qlog == LOSSLESS_QLOG){ |
| for(; yq<slice_h && yq<h; yq++){ |
| IDWTELEM * line = slice_buffer_get_line(&s->sb, yq); |
| for(x=0; x<w; x++){ |
| line[x] <<= FRAC_BITS; |
| } |
| } |
| } |
| |
| predict_slice_buffered(s, &s->sb, s->spatial_idwt_buffer, plane_index, 1, mb_y); |
| |
| y = FFMIN(p->height, slice_starty); |
| end_y = FFMIN(p->height, slice_h); |
| while(y < end_y) |
| ff_slice_buffer_release(&s->sb, y++); |
| } |
| |
| ff_slice_buffer_flush(&s->sb); |
| } |
| |
| } |
| |
| emms_c(); |
| |
| ff_snow_release_buffer(avctx); |
| |
| if(!(s->avctx->debug&2048)) |
| res = av_frame_ref(picture, s->current_picture); |
| else |
| res = av_frame_ref(picture, s->mconly_picture); |
| if (res >= 0 && s->avmv_index) { |
| AVFrameSideData *sd; |
| |
| sd = av_frame_new_side_data(picture, AV_FRAME_DATA_MOTION_VECTORS, s->avmv_index * sizeof(AVMotionVector)); |
| if (!sd) |
| return AVERROR(ENOMEM); |
| memcpy(sd->data, s->avmv, s->avmv_index * sizeof(AVMotionVector)); |
| } |
| |
| av_freep(&s->avmv); |
| |
| if (res < 0) |
| return res; |
| |
| *got_frame = 1; |
| |
| bytes_read= c->bytestream - c->bytestream_start; |
| if(bytes_read ==0) av_log(s->avctx, AV_LOG_ERROR, "error at end of frame\n"); //FIXME |
| |
| return bytes_read; |
| } |
| |
| static av_cold int decode_end(AVCodecContext *avctx) |
| { |
| SnowContext *s = avctx->priv_data; |
| |
| ff_slice_buffer_destroy(&s->sb); |
| |
| ff_snow_common_end(s); |
| |
| return 0; |
| } |
| |
| AVCodec ff_snow_decoder = { |
| .name = "snow", |
| .long_name = NULL_IF_CONFIG_SMALL("Snow"), |
| .type = AVMEDIA_TYPE_VIDEO, |
| .id = AV_CODEC_ID_SNOW, |
| .priv_data_size = sizeof(SnowContext), |
| .init = decode_init, |
| .close = decode_end, |
| .decode = decode_frame, |
| .capabilities = AV_CODEC_CAP_DR1 /*| AV_CODEC_CAP_DRAW_HORIZ_BAND*/, |
| .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE | |
| FF_CODEC_CAP_INIT_CLEANUP, |
| }; |
