mirror of https://github.com/FFmpeg/FFmpeg.git
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
125 lines
4.3 KiB
125 lines
4.3 KiB
/* |
|
* 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 "avcodec.h" |
|
#include "get_bits.h" |
|
#include "dsputil.h" |
|
|
|
#define MAX_COMPONENTS 4 |
|
|
|
typedef struct MJpegDecodeContext { |
|
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; |
|
} 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 */
|
|
|