952a32e9a0
The earlier code had two problems: 1. For reference frames that are not directly output (happens unless low_delay is set), the mb skip values referred to the next reference frame to be decoded. 2. For non-reference frames, every macroblock was always considered skipped. This makes the output (worse than) useless; that no one ever complained about this shows that this feature is not really used. It is therefore removed. Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
114 lines
4.3 KiB
C
114 lines
4.3 KiB
C
/*
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* Mpeg video formats-related defines and utility functions
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*
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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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#ifndef AVCODEC_MPEGUTILS_H
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#define AVCODEC_MPEGUTILS_H
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#include <stdint.h>
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#include "libavutil/frame.h"
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#include "avcodec.h"
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/* picture type */
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#define PICT_TOP_FIELD 1
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#define PICT_BOTTOM_FIELD 2
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#define PICT_FRAME 3
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#define MAX_MB_BYTES (30 * 16 * 16 * 3 / 8 + 120)
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#define MAX_FCODE 7
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/* MB types */
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#define MB_TYPE_INTRA4x4 (1 << 0)
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#define MB_TYPE_INTRA16x16 (1 << 1) // FIXME H.264-specific
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#define MB_TYPE_INTRA_PCM (1 << 2) // FIXME H.264-specific
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#define MB_TYPE_16x16 (1 << 3)
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#define MB_TYPE_16x8 (1 << 4)
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#define MB_TYPE_8x16 (1 << 5)
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#define MB_TYPE_8x8 (1 << 6)
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#define MB_TYPE_INTERLACED (1 << 7)
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#define MB_TYPE_DIRECT2 (1 << 8) // FIXME
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#define MB_TYPE_CBP (1 << 10)
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#define MB_TYPE_QUANT (1 << 11)
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#define MB_TYPE_FORWARD_MV (1 << 12)
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#define MB_TYPE_BACKWARD_MV (1 << 13)
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#define MB_TYPE_BIDIR_MV (MB_TYPE_FORWARD_MV | MB_TYPE_BACKWARD_MV)
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// MB_TYPE_P[01]L[01], MB_TYPE_L[01] and MB_TYPE_L0L1 are H.264 only.
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#define MB_TYPE_P0L0 (1 << 12)
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#define MB_TYPE_P1L0 (1 << 13)
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#define MB_TYPE_P0L1 (1 << 14)
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#define MB_TYPE_P1L1 (1 << 15)
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#define MB_TYPE_L0 (MB_TYPE_P0L0 | MB_TYPE_P1L0)
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#define MB_TYPE_L1 (MB_TYPE_P0L1 | MB_TYPE_P1L1)
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#define MB_TYPE_L0L1 (MB_TYPE_L0 | MB_TYPE_L1)
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#define MB_TYPE_GMC (1 << 16)
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#define MB_TYPE_SKIP (1 << 17)
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#define MB_TYPE_ACPRED (1 << 18)
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#define MB_TYPE_INTRA MB_TYPE_INTRA4x4 // default mb_type if there is just one type
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// The following MB-type can be used by each codec as it sees fit.
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#define MB_TYPE_CODEC_SPECIFIC (1 << 9)
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#define IS_INTRA4x4(a) ((a) & MB_TYPE_INTRA4x4)
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#define IS_INTRA16x16(a) ((a) & MB_TYPE_INTRA16x16)
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#define IS_PCM(a) ((a) & MB_TYPE_INTRA_PCM)
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#define IS_INTRA(a) ((a) & 7)
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#define IS_INTER(a) ((a) & (MB_TYPE_16x16 | MB_TYPE_16x8 | \
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MB_TYPE_8x16 | MB_TYPE_8x8))
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#define IS_SKIP(a) ((a) & MB_TYPE_SKIP)
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#define IS_INTRA_PCM(a) ((a) & MB_TYPE_INTRA_PCM)
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#define IS_INTERLACED(a) ((a) & MB_TYPE_INTERLACED)
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#define IS_DIRECT(a) ((a) & MB_TYPE_DIRECT2)
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#define IS_GMC(a) ((a) & MB_TYPE_GMC)
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#define IS_16X16(a) ((a) & MB_TYPE_16x16)
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#define IS_16X8(a) ((a) & MB_TYPE_16x8)
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#define IS_8X16(a) ((a) & MB_TYPE_8x16)
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#define IS_8X8(a) ((a) & MB_TYPE_8x8)
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#define IS_ACPRED(a) ((a) & MB_TYPE_ACPRED)
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#define IS_QUANT(a) ((a) & MB_TYPE_QUANT)
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#define HAS_CBP(a) ((a) & MB_TYPE_CBP)
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#define HAS_FORWARD_MV(a) ((a) & MB_TYPE_FORWARD_MV)
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#define HAS_BACKWARD_MV(a) ((a) & MB_TYPE_BACKWARD_MV)
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// dir == 0 means forward, dir == 1 is backward
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#define HAS_MV(a, dir) ((a) & (MB_TYPE_FORWARD_MV << (dir)))
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#define MB_TYPE_MV_2_MV_DIR(a) (((a) >> 12) & (MV_DIR_FORWARD | MV_DIR_BACKWARD))
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/**
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* Draw a horizontal band if supported.
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*
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* @param h is the normal height, this will be reduced automatically if needed
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*/
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void ff_draw_horiz_band(AVCodecContext *avctx, const AVFrame *cur, const AVFrame *last,
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int y, int h, int picture_structure, int first_field,
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int low_delay);
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/**
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* Print debugging info for the given picture.
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*/
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void ff_print_debug_info2(AVCodecContext *avctx, AVFrame *pict,
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const uint32_t *mbtype_table,
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const int8_t *qscale_table, int16_t (*const motion_val[2])[2],
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int mb_width, int mb_height, int mb_stride, int quarter_sample);
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#endif /* AVCODEC_MPEGUTILS_H */
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