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This has the advantage of not having to check for whether a given MpegEncContext is actually a decoder or an encoder context at runtime. To do so, mpv_reconstruct_mb_internal() is moved into a new template file that is included by both mpegvideo_enc.c and mpegvideo_dec.c; the decoder-only code (mainly lowres) are also moved to mpegvideo_dec.c. The is_encoder checks are changed to #if IS_ENCODER in order to avoid having to include headers for decoder-only functions in mpegvideo_enc.c. This approach also has the advantage that it is easy to adapt mpv_reconstruct_mb_internal() to using different structures for decoders and encoders (e.g. the check for whether a macroblock should be processed for the encoder or not uses MpegEncContext elements that make no sense for decoders and should not be part of their context). Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
84 lines
2.6 KiB
C
84 lines
2.6 KiB
C
/*
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* MPEGVideo decoders header
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* Copyright (c) 2000, 2001, 2002 Fabrice Bellard
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* Copyright (c) 2002-2004 Michael Niedermayer
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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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/**
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* @file
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* mpegvideo decoder header.
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*/
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#ifndef AVCODEC_MPEGVIDEODEC_H
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#define AVCODEC_MPEGVIDEODEC_H
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#include "libavutil/frame.h"
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#include "libavutil/log.h"
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#include "avcodec.h"
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#include "get_bits.h"
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#include "mpegpicture.h"
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#include "mpegvideo.h"
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#include "mpegvideodata.h"
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#define FF_MPV_QSCALE_TYPE_MPEG1 0
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#define FF_MPV_QSCALE_TYPE_MPEG2 1
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/**
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* Initialize the given MpegEncContext for decoding.
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* the changed fields will not depend upon
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* the prior state of the MpegEncContext.
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*/
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void ff_mpv_decode_init(MpegEncContext *s, AVCodecContext *avctx);
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int ff_mpv_common_frame_size_change(MpegEncContext *s);
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int ff_mpv_frame_start(MpegEncContext *s, AVCodecContext *avctx);
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void ff_mpv_reconstruct_mb(MpegEncContext *s, int16_t block[12][64]);
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void ff_mpv_report_decode_progress(MpegEncContext *s);
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void ff_mpv_frame_end(MpegEncContext *s);
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int ff_mpv_export_qp_table(const MpegEncContext *s, AVFrame *f, const Picture *p, int qp_type);
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int ff_mpeg_update_thread_context(AVCodecContext *dst, const AVCodecContext *src);
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void ff_mpeg_draw_horiz_band(MpegEncContext *s, int y, int h);
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void ff_mpeg_flush(AVCodecContext *avctx);
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void ff_print_debug_info(const MpegEncContext *s, const Picture *p, AVFrame *pict);
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static inline int mpeg_get_qscale(MpegEncContext *s)
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{
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int qscale = get_bits(&s->gb, 5);
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if (s->q_scale_type)
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return ff_mpeg2_non_linear_qscale[qscale];
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else
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return qscale << 1;
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}
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static inline int check_marker(void *logctx, GetBitContext *s, const char *msg)
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{
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int bit = get_bits1(s);
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if (!bit)
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av_log(logctx, AV_LOG_INFO, "Marker bit missing at %d of %d %s\n",
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get_bits_count(s) - 1, s->size_in_bits, msg);
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return bit;
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}
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#endif /* AVCODEC_MPEGVIDEODEC_H */
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