mirror of
https://gitee.com/openharmony/third_party_ffmpeg
synced 2024-11-23 19:30:05 +00:00
131 lines
4.4 KiB
C
131 lines
4.4 KiB
C
/*
|
|
* MJPEG decoder
|
|
* Copyright (c) 2000, 2001 Fabrice Bellard
|
|
* Copyright (c) 2003 Alex Beregszaszi
|
|
* Copyright (c) 2003-2004 Michael Niedermayer
|
|
*
|
|
* 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
|
|
*/
|
|
|
|
/**
|
|
* @file
|
|
* MJPEG decoder.
|
|
*/
|
|
|
|
#ifndef AVCODEC_MJPEGDEC_H
|
|
#define AVCODEC_MJPEGDEC_H
|
|
|
|
#include "libavutil/log.h"
|
|
|
|
#include "avcodec.h"
|
|
#include "get_bits.h"
|
|
#include "dsputil.h"
|
|
|
|
#define MAX_COMPONENTS 4
|
|
|
|
typedef struct MJpegDecodeContext {
|
|
AVClass *class;
|
|
AVCodecContext *avctx;
|
|
GetBitContext gb;
|
|
|
|
int start_code; /* current start code */
|
|
int buffer_size;
|
|
uint8_t *buffer;
|
|
|
|
int16_t quant_matrixes[4][64];
|
|
VLC vlcs[3][4];
|
|
int qscale[4]; ///< quantizer scale calculated from quant_matrixes
|
|
|
|
int org_height; /* size given at codec init */
|
|
int first_picture; /* true if decoding first picture */
|
|
int interlaced; /* true if interlaced */
|
|
int bottom_field; /* true if bottom field */
|
|
int lossless;
|
|
int ls;
|
|
int progressive;
|
|
int rgb;
|
|
int rct; /* standard rct */
|
|
int pegasus_rct; /* pegasus reversible colorspace transform */
|
|
int bits; /* bits per component */
|
|
|
|
int maxval;
|
|
int near; ///< near lossless bound (si 0 for lossless)
|
|
int t1,t2,t3;
|
|
int reset; ///< context halfing intervall ?rename
|
|
|
|
int width, height;
|
|
int mb_width, mb_height;
|
|
int nb_components;
|
|
int block_stride[MAX_COMPONENTS];
|
|
int component_id[MAX_COMPONENTS];
|
|
int h_count[MAX_COMPONENTS]; /* horizontal and vertical count for each component */
|
|
int v_count[MAX_COMPONENTS];
|
|
int comp_index[MAX_COMPONENTS];
|
|
int dc_index[MAX_COMPONENTS];
|
|
int ac_index[MAX_COMPONENTS];
|
|
int nb_blocks[MAX_COMPONENTS];
|
|
int h_scount[MAX_COMPONENTS];
|
|
int v_scount[MAX_COMPONENTS];
|
|
int h_max, v_max; /* maximum h and v counts */
|
|
int quant_index[4]; /* quant table index for each component */
|
|
int last_dc[MAX_COMPONENTS]; /* last DEQUANTIZED dc (XXX: am I right to do that ?) */
|
|
AVFrame picture; /* picture structure */
|
|
AVFrame *picture_ptr; /* pointer to picture structure */
|
|
int got_picture; ///< we found a SOF and picture is valid, too.
|
|
int linesize[MAX_COMPONENTS]; ///< linesize << interlaced
|
|
int8_t *qscale_table;
|
|
DECLARE_ALIGNED(16, DCTELEM, block)[64];
|
|
DCTELEM (*blocks[MAX_COMPONENTS])[64]; ///< intermediate sums (progressive mode)
|
|
uint8_t *last_nnz[MAX_COMPONENTS];
|
|
uint64_t coefs_finished[MAX_COMPONENTS]; ///< bitmask of which coefs have been completely decoded (progressive mode)
|
|
ScanTable scantable;
|
|
DSPContext dsp;
|
|
|
|
int restart_interval;
|
|
int restart_count;
|
|
|
|
int buggy_avid;
|
|
int cs_itu601;
|
|
int interlace_polarity;
|
|
|
|
int mjpb_skiptosod;
|
|
|
|
int cur_scan; /* current scan, used by JPEG-LS */
|
|
int flipped; /* true if picture is flipped */
|
|
|
|
uint16_t (*ljpeg_buffer)[4];
|
|
unsigned int ljpeg_buffer_size;
|
|
|
|
int extern_huff;
|
|
} MJpegDecodeContext;
|
|
|
|
int ff_mjpeg_decode_init(AVCodecContext *avctx);
|
|
int ff_mjpeg_decode_end(AVCodecContext *avctx);
|
|
int ff_mjpeg_decode_frame(AVCodecContext *avctx,
|
|
void *data, int *data_size,
|
|
AVPacket *avpkt);
|
|
int ff_mjpeg_decode_dqt(MJpegDecodeContext *s);
|
|
int ff_mjpeg_decode_dht(MJpegDecodeContext *s);
|
|
int ff_mjpeg_decode_sof(MJpegDecodeContext *s);
|
|
int ff_mjpeg_decode_sos(MJpegDecodeContext *s,
|
|
const uint8_t *mb_bitmask, const AVFrame *reference);
|
|
int ff_mjpeg_find_marker(MJpegDecodeContext *s,
|
|
const uint8_t **buf_ptr, const uint8_t *buf_end,
|
|
const uint8_t **unescaped_buf_ptr, int *unescaped_buf_size);
|
|
|
|
#endif /* AVCODEC_MJPEGDEC_H */
|