FFmpeg/libavcodec/mpegutils.h

/*
 * Mpeg video formats-related defines and utility functions
 *
 * This file is part of Libav.
 *
 * Libav 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.
 *
 * Libav 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 Libav; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

#ifndef AVCODEC_MPEGUTILS_H
#define AVCODEC_MPEGUTILS_H

#include <stdint.h>

#include "libavutil/frame.h"

#include "avcodec.h"
#include "version.h"

/**
 * Return value for header parsers if frame is not coded.
 * */
#define FRAME_SKIPPED 100

/* picture type */
#define PICT_TOP_FIELD     1
#define PICT_BOTTOM_FIELD  2
#define PICT_FRAME         3

/**
 * Value of Picture.reference when Picture is not a reference picture, but
 * is held for delayed output.
 */
#define DELAYED_PIC_REF 4

#define MAX_MB_BYTES    (30 * 16 * 16 * 3 / 8 + 120)
#define MAX_FCODE        7

/* MB types */
#define MB_TYPE_INTRA4x4   (1 <<  0)
#define MB_TYPE_INTRA16x16 (1 <<  1) // FIXME H.264-specific
#define MB_TYPE_INTRA_PCM  (1 <<  2) // FIXME H.264-specific
#define MB_TYPE_16x16      (1 <<  3)
#define MB_TYPE_16x8       (1 <<  4)
#define MB_TYPE_8x16       (1 <<  5)
#define MB_TYPE_8x8        (1 <<  6)
#define MB_TYPE_INTERLACED (1 <<  7)
#define MB_TYPE_DIRECT2    (1 <<  8) // FIXME
#define MB_TYPE_ACPRED     (1 <<  9)
#define MB_TYPE_GMC        (1 << 10)
#define MB_TYPE_SKIP       (1 << 11)
#define MB_TYPE_P0L0       (1 << 12)
#define MB_TYPE_P1L0       (1 << 13)
#define MB_TYPE_P0L1       (1 << 14)
#define MB_TYPE_P1L1       (1 << 15)
#define MB_TYPE_L0         (MB_TYPE_P0L0 | MB_TYPE_P1L0)
#define MB_TYPE_L1         (MB_TYPE_P0L1 | MB_TYPE_P1L1)
#define MB_TYPE_L0L1       (MB_TYPE_L0   | MB_TYPE_L1)
#define MB_TYPE_QUANT      (1 << 16)
#define MB_TYPE_CBP        (1 << 17)

#define MB_TYPE_INTRA    MB_TYPE_INTRA4x4 // default mb_type if there is just one type

#define IS_INTRA4x4(a)   ((a) & MB_TYPE_INTRA4x4)
#define IS_INTRA16x16(a) ((a) & MB_TYPE_INTRA16x16)
#define IS_PCM(a)        ((a) & MB_TYPE_INTRA_PCM)
#define IS_INTRA(a)      ((a) & 7)
#define IS_INTER(a)      ((a) & (MB_TYPE_16x16 | MB_TYPE_16x8 | \
                                 MB_TYPE_8x16  | MB_TYPE_8x8))
#define IS_SKIP(a)       ((a) & MB_TYPE_SKIP)
#define IS_INTRA_PCM(a)  ((a) & MB_TYPE_INTRA_PCM)
#define IS_INTERLACED(a) ((a) & MB_TYPE_INTERLACED)
#define IS_DIRECT(a)     ((a) & MB_TYPE_DIRECT2)
#define IS_GMC(a)        ((a) & MB_TYPE_GMC)
#define IS_16X16(a)      ((a) & MB_TYPE_16x16)
#define IS_16X8(a)       ((a) & MB_TYPE_16x8)
#define IS_8X16(a)       ((a) & MB_TYPE_8x16)
#define IS_8X8(a)        ((a) & MB_TYPE_8x8)
#define IS_SUB_8X8(a)    ((a) & MB_TYPE_16x16) // note reused
#define IS_SUB_8X4(a)    ((a) & MB_TYPE_16x8)  // note reused
#define IS_SUB_4X8(a)    ((a) & MB_TYPE_8x16)  // note reused
#define IS_SUB_4X4(a)    ((a) & MB_TYPE_8x8)   // note reused
#define IS_ACPRED(a)     ((a) & MB_TYPE_ACPRED)
#define IS_QUANT(a)      ((a) & MB_TYPE_QUANT)
#define IS_DIR(a, part, list) ((a) & (MB_TYPE_P0L0 << ((part) + 2 * (list))))

// does this mb use listX, note does not work if subMBs
#define USES_LIST(a, list) ((a) & ((MB_TYPE_P0L0 | MB_TYPE_P1L0) << (2 * (list))))

#define HAS_CBP(a)       ((a) & MB_TYPE_CBP)

/* MB types for encoding */
#define CANDIDATE_MB_TYPE_INTRA      (1 <<  0)
#define CANDIDATE_MB_TYPE_INTER      (1 <<  1)
#define CANDIDATE_MB_TYPE_INTER4V    (1 <<  2)
#define CANDIDATE_MB_TYPE_SKIPPED    (1 <<  3)

#define CANDIDATE_MB_TYPE_DIRECT     (1 <<  4)
#define CANDIDATE_MB_TYPE_FORWARD    (1 <<  5)
#define CANDIDATE_MB_TYPE_BACKWARD   (1 <<  6)
#define CANDIDATE_MB_TYPE_BIDIR      (1 <<  7)

#define CANDIDATE_MB_TYPE_INTER_I    (1 <<  8)
#define CANDIDATE_MB_TYPE_FORWARD_I  (1 <<  9)
#define CANDIDATE_MB_TYPE_BACKWARD_I (1 << 10)
#define CANDIDATE_MB_TYPE_BIDIR_I    (1 << 11)

#define CANDIDATE_MB_TYPE_DIRECT0    (1 << 12)

#define INPLACE_OFFSET 16

enum OutputFormat {
    FMT_MPEG1,
    FMT_H261,
    FMT_H263,
    FMT_MJPEG,
};


/**
 * Draw a horizontal band if supported.
 *
 * @param h is the normal height, this will be reduced automatically if needed
 */
void ff_draw_horiz_band(AVCodecContext *avctx, AVFrame *cur, AVFrame *last,
                        int y, int h, int picture_structure, int first_field,
                        int low_delay);

#endif /* AVCODEC_MPEGUTILS_H */