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7b539ca3e6
The error resilience code does not make up block coefficients and therefore zeroes them in order to disable the IDCT. But this can be done in a simpler manner, namely by setting block_last_index to a negative value. Doing so also has the advantage that the dct_unquantize functions are never even called for those codecs that do not use ff_mpv_reconstruct_mb() for ordinary decoding (namely RV-30/40 and the VC-1 family). This approach would not work for intra macroblocks (there is always at least one coefficient for them and therefore there is no check for block_last_index for them), but this does not happen at all. Add an assert for this. Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
137 lines
4.0 KiB
C
137 lines
4.0 KiB
C
/*
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* This file is part of FFmpeg.
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*
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* FFmpeg 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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* FFmpeg 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 FFmpeg; 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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#include "libavutil/avassert.h"
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#include "libavutil/mem.h"
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#include "error_resilience.h"
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#include "mpegvideo.h"
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#include "mpegvideodec.h"
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#include "mpeg_er.h"
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static void set_erpic(ERPicture *dst, const MPVPicture *src)
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{
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int i;
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memset(dst, 0, sizeof(*dst));
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if (!src) {
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dst->f = NULL;
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dst->tf = NULL;
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return;
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}
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dst->f = src->f;
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dst->progress = &src->progress;
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for (i = 0; i < 2; i++) {
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dst->motion_val[i] = src->motion_val[i];
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dst->ref_index[i] = src->ref_index[i];
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}
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dst->mb_type = src->mb_type;
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dst->field_picture = src->field_picture;
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}
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void ff_mpeg_er_frame_start(MpegEncContext *s)
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{
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ERContext *er = &s->er;
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set_erpic(&er->cur_pic, s->cur_pic.ptr);
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set_erpic(&er->next_pic, s->next_pic.ptr);
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set_erpic(&er->last_pic, s->last_pic.ptr);
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er->pp_time = s->pp_time;
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er->pb_time = s->pb_time;
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er->quarter_sample = s->quarter_sample;
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er->partitioned_frame = s->partitioned_frame;
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ff_er_frame_start(er);
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}
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static void mpeg_er_decode_mb(void *opaque, int ref, int mv_dir, int mv_type,
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int (*mv)[2][4][2], int mb_x, int mb_y,
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int mb_intra, int mb_skipped)
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{
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MpegEncContext *s = opaque;
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av_assert1(!mb_intra);
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s->mv_dir = mv_dir;
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s->mv_type = mv_type;
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s->mb_intra = mb_intra;
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s->mb_skipped = mb_skipped;
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s->mb_x = mb_x;
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s->mb_y = mb_y;
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s->mcsel = 0;
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memcpy(s->mv, mv, sizeof(*mv));
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// The following disables the IDCT.
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for (size_t i = 0; i < FF_ARRAY_ELEMS(s->block_last_index); i++)
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s->block_last_index[i] = -1;
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s->dest[0] = s->cur_pic.data[0] +
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s->mb_y * 16 * s->linesize +
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s->mb_x * 16;
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s->dest[1] = s->cur_pic.data[1] +
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s->mb_y * (16 >> s->chroma_y_shift) * s->uvlinesize +
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s->mb_x * (16 >> s->chroma_x_shift);
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s->dest[2] = s->cur_pic.data[2] +
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s->mb_y * (16 >> s->chroma_y_shift) * s->uvlinesize +
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s->mb_x * (16 >> s->chroma_x_shift);
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if (ref)
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av_log(s->avctx, AV_LOG_DEBUG,
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"Interlaced error concealment is not fully implemented\n");
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ff_mpv_reconstruct_mb(s, s->block);
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}
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int ff_mpeg_er_init(MpegEncContext *s)
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{
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ERContext *er = &s->er;
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int mb_array_size = s->mb_height * s->mb_stride;
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int i;
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er->avctx = s->avctx;
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er->mb_index2xy = s->mb_index2xy;
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er->mb_num = s->mb_num;
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er->mb_width = s->mb_width;
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er->mb_height = s->mb_height;
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er->mb_stride = s->mb_stride;
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er->b8_stride = s->b8_stride;
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er->er_temp_buffer = av_malloc(s->mb_height * s->mb_stride * (4*sizeof(int) + 1));
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er->error_status_table = av_mallocz(mb_array_size);
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if (!er->er_temp_buffer || !er->error_status_table)
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goto fail;
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er->mbskip_table = s->mbskip_table;
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er->mbintra_table = s->mbintra_table;
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for (i = 0; i < FF_ARRAY_ELEMS(s->dc_val); i++)
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er->dc_val[i] = s->dc_val[i];
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er->decode_mb = mpeg_er_decode_mb;
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er->opaque = s;
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return 0;
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fail:
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av_freep(&er->er_temp_buffer);
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av_freep(&er->error_status_table);
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return AVERROR(ENOMEM);
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}
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