mirror of
https://gitee.com/openharmony/third_party_ffmpeg
synced 2024-11-24 03:39:45 +00:00
cd8c64e197
This reverts commit da22ba7df4 since it
broke slice threading. Slice threading just duplicates MpegEncContext
so every value used during mpeg_decode_slice has to be in it.
A second patch will fix the illusion that Mpeg1Context is available
in mpeg_decode_slice.
76 lines
2.4 KiB
C
76 lines
2.4 KiB
C
/*
|
|
* MPEG1/2 common code
|
|
* Copyright (c) 2007 Aurelien Jacobs <aurel@gnuage.org>
|
|
*
|
|
* 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_MPEG12_H
|
|
#define AVCODEC_MPEG12_H
|
|
|
|
#include "mpegvideo.h"
|
|
|
|
#define DC_VLC_BITS 9
|
|
#define TEX_VLC_BITS 9
|
|
|
|
extern VLC ff_dc_lum_vlc;
|
|
extern VLC ff_dc_chroma_vlc;
|
|
|
|
typedef struct Mpeg1Context {
|
|
MpegEncContext mpeg_enc_ctx;
|
|
int mpeg_enc_ctx_allocated; /* true if decoding context allocated */
|
|
int repeat_field; /* true if we must repeat the field */
|
|
AVPanScan pan_scan; /**< some temporary storage for the panscan */
|
|
int slice_count;
|
|
int swap_uv;//indicate VCR2
|
|
int save_aspect_info;
|
|
int save_width, save_height, save_progressive_seq;
|
|
AVRational frame_rate_ext; ///< MPEG-2 specific framerate modificator
|
|
int sync; ///< Did we reach a sync point like a GOP/SEQ/KEYFrame?
|
|
int closed_gop; ///< GOP is closed
|
|
} Mpeg1Context;
|
|
|
|
extern uint8_t ff_mpeg12_static_rl_table_store[2][2][2*MAX_RUN + MAX_LEVEL + 3];
|
|
|
|
void ff_mpeg12_common_init(MpegEncContext *s);
|
|
void ff_mpeg12_init_vlcs(void);
|
|
|
|
static inline int decode_dc(GetBitContext *gb, int component)
|
|
{
|
|
int code, diff;
|
|
|
|
if (component == 0) {
|
|
code = get_vlc2(gb, ff_dc_lum_vlc.table, DC_VLC_BITS, 2);
|
|
} else {
|
|
code = get_vlc2(gb, ff_dc_chroma_vlc.table, DC_VLC_BITS, 2);
|
|
}
|
|
if (code < 0){
|
|
av_log(NULL, AV_LOG_ERROR, "invalid dc code at\n");
|
|
return 0xffff;
|
|
}
|
|
if (code == 0) {
|
|
diff = 0;
|
|
} else {
|
|
diff = get_xbits(gb, code);
|
|
}
|
|
return diff;
|
|
}
|
|
|
|
extern int ff_mpeg1_decode_block_intra(MpegEncContext *s, DCTELEM *block, int n);
|
|
|
|
#endif /* AVCODEC_MPEG12_H */
|