mpegvideodec.h

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/*
 * MPEGVideo decoders header
 * Copyright (c) 2000, 2001, 2002 Fabrice Bellard
 * Copyright (c) 2002-2004 Michael Niedermayer
 *
 * 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
 * mpegvideo decoder header.
 */
 
#ifndef AVCODEC_MPEGVIDEODEC_H
#define AVCODEC_MPEGVIDEODEC_H
 
#include "libavutil/frame.h"
#include "libavutil/log.h"
 
#include "avcodec.h"
#include "get_bits.h"
#include "mpegpicture.h"
#include "mpegvideo.h"
#include "mpegvideodata.h"
 
#define FF_MPV_QSCALE_TYPE_MPEG1 0
#define FF_MPV_QSCALE_TYPE_MPEG2 1
 
/**
 * Initialize the given MpegEncContext for decoding.
 * the changed fields will not depend upon
 * the prior state of the MpegEncContext.
 *
 * Also initialize the picture pool.
 */
int ff_mpv_decode_init(MpegEncContext *s, AVCodecContext *avctx);
 
int ff_mpv_common_frame_size_change(MpegEncContext *s);
 
int ff_mpv_frame_start(MpegEncContext *s, AVCodecContext *avctx);
/**
 * Ensure that the dummy frames are allocated according to pict_type if necessary.
 */
int ff_mpv_alloc_dummy_frames(MpegEncContext *s);
void ff_mpv_reconstruct_mb(MPVContext *s, int16_t block[][64]);
void ff_mpv_frame_end(MpegEncContext *s);
 
int ff_mpv_export_qp_table(const MpegEncContext *s, AVFrame *f,
                           const MPVPicture *p, int qp_type);
/**
 * update_thread_context for mpegvideo-based decoders. It updates
 * the MPVPictures and generic stream-level parameters. If necessary
 * (on dimension changes), it also performs reinitialization.
 *
 * @retval 1 if a reinitialization happened
 * @retval 0 on success if no reinitialization happened
 * @retval "<0" error code
 */
int ff_mpeg_update_thread_context(AVCodecContext *dst, const AVCodecContext *src);
void ff_mpeg_draw_horiz_band(MpegEncContext *s, int y, int h);
void ff_mpeg_flush(AVCodecContext *avctx);
int ff_mpv_decode_close(AVCodecContext *avctx);
 
void ff_print_debug_info(const MpegEncContext *s, const MPVPicture *p, AVFrame *pict);
 
static inline int mpeg_get_qscale(GetBitContext *const gb, int q_scale_type)
{
    int qscale = get_bits(gb, 5);
    if (q_scale_type)
        return ff_mpeg2_non_linear_qscale[qscale];
    else
        return qscale << 1;
}
 
static inline int check_marker(void *logctx, GetBitContext *s, const char *msg)
{
    int bit = get_bits1(s);
    if (!bit)
        av_log(logctx, AV_LOG_INFO, "Marker bit missing at %d of %d %s\n",
               get_bits_count(s) - 1, s->size_in_bits, msg);
 
    return bit;
}
 
#endif /* AVCODEC_MPEGVIDEODEC_H */