/* * MJPEG decoder * Copyright (c) 2000, 2001 Fabrice Bellard * Copyright (c) 2003 Alex Beregszaszi * Copyright (c) 2003-2004 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 * MJPEG decoder. */ #ifndef AVCODEC_MJPEGDEC_H #define AVCODEC_MJPEGDEC_H #include "libavutil/log.h" #include "libavutil/pixdesc.h" #include "libavutil/stereo3d.h" #include "avcodec.h" #include "blockdsp.h" #include "get_bits.h" #include "hpeldsp.h" #include "idctdsp.h" #undef near /* This file uses struct member 'near' which in windows.h is defined as empty. */ #define MAX_COMPONENTS 4 typedef struct MJpegDecodeContext { AVClass *class; AVCodecContext *avctx; GetBitContext gb; int buf_size; AVPacket *pkt; int start_code; /* current start code */ int buffer_size; uint8_t *buffer; uint16_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 bayer; /* true if it's a bayer-encoded JPEG embedded in a DNG */ int rgb; uint8_t upscale_h[4]; uint8_t upscale_v[4]; int rct; /* standard rct */ int pegasus_rct; /* pegasus reversible colorspace transform */ int bits; /* bits per component */ int colr; int xfrm; int adobe_transform; int maxval; int near; ///< near lossless bound (si 0 for lossless) int t1,t2,t3; int reset; ///< context halfing interval ?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 quant_sindex[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(32, int16_t, block)[64]; int16_t (*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) int palette_index; ScanTable scantable; BlockDSPContext bdsp; HpelDSPContext hdsp; IDCTDSPContext idsp; int restart_interval; int restart_count; int buggy_avid; int cs_itu601; int interlace_polarity; int multiscope; 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; AVDictionary *exif_metadata; AVStereo3D *stereo3d; ///!< stereoscopic information (cached, since it is read before frame allocation) const AVPixFmtDescriptor *pix_desc; uint8_t **iccdata; int *iccdatalens; int iccnum; int iccread; AVFrame *smv_frame; int smv_frames_per_jpeg; int smv_next_frame; // Raw stream data for hwaccel use. const uint8_t *raw_image_buffer; size_t raw_image_buffer_size; const uint8_t *raw_scan_buffer; size_t raw_scan_buffer_size; uint8_t raw_huffman_lengths[2][4][16]; uint8_t raw_huffman_values[2][4][256]; enum AVPixelFormat hwaccel_sw_pix_fmt; enum AVPixelFormat hwaccel_pix_fmt; void *hwaccel_picture_private; } MJpegDecodeContext; int ff_mjpeg_decode_init(AVCodecContext *avctx); int ff_mjpeg_decode_end(AVCodecContext *avctx); int ff_mjpeg_receive_frame(AVCodecContext *avctx, AVFrame *frame); 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,int mb_bitmask_size, 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); int ff_sp5x_process_packet(AVCodecContext *avctx, AVPacket *avpkt); #endif /* AVCODEC_MJPEGDEC_H */