/* * MJPEG encoder * Copyright (c) 2000, 2001 Fabrice Bellard * Copyright (c) 2003 Alex Beregszaszi * Copyright (c) 2003-2004 Michael Niedermayer * * Support for external huffman table, various fixes (AVID workaround), * aspecting, new decode_frame mechanism and apple mjpeg-b support * by Alex Beregszaszi * * 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 encoder. */ #ifndef AVCODEC_MJPEGENC_H #define AVCODEC_MJPEGENC_H #include <stdint.h> #include "mjpeg.h" #include "mpegvideo.h" #include "put_bits.h" /** * Buffer of JPEG frame data. * * Optimal Huffman table generation requires the frame data to be loaded into * a buffer so that the tables can be computed. * There are at most mb_width*mb_height*12*64 of these per frame. */ typedef struct MJpegHuffmanCode { // 0=DC lum, 1=DC chrom, 2=AC lum, 3=AC chrom uint8_t table_id; ///< The Huffman table id associated with the data. uint8_t code; ///< The exponent. uint16_t mant; ///< The mantissa. } MJpegHuffmanCode; /** * Holds JPEG frame data and Huffman table data. */ typedef struct MJpegContext { //FIXME use array [3] instead of lumi / chroma, for easier addressing uint8_t huff_size_dc_luminance[12]; ///< DC luminance Huffman table size. uint16_t huff_code_dc_luminance[12]; ///< DC luminance Huffman table codes. uint8_t huff_size_dc_chrominance[12]; ///< DC chrominance Huffman table size. uint16_t huff_code_dc_chrominance[12]; ///< DC chrominance Huffman table codes. uint8_t huff_size_ac_luminance[256]; ///< AC luminance Huffman table size. uint16_t huff_code_ac_luminance[256]; ///< AC luminance Huffman table codes. uint8_t huff_size_ac_chrominance[256]; ///< AC chrominance Huffman table size. uint16_t huff_code_ac_chrominance[256]; ///< AC chrominance Huffman table codes. /** Storage for AC luminance VLC (in MpegEncContext) */ uint8_t uni_ac_vlc_len[64 * 64 * 2]; /** Storage for AC chrominance VLC (in MpegEncContext) */ uint8_t uni_chroma_ac_vlc_len[64 * 64 * 2]; // Default DC tables have exactly 12 values uint8_t bits_dc_luminance[17]; ///< DC luminance Huffman bits. uint8_t val_dc_luminance[12]; ///< DC luminance Huffman values. uint8_t bits_dc_chrominance[17]; ///< DC chrominance Huffman bits. uint8_t val_dc_chrominance[12]; ///< DC chrominance Huffman values. // 8-bit JPEG has max 256 values uint8_t bits_ac_luminance[17]; ///< AC luminance Huffman bits. uint8_t val_ac_luminance[256]; ///< AC luminance Huffman values. uint8_t bits_ac_chrominance[17]; ///< AC chrominance Huffman bits. uint8_t val_ac_chrominance[256]; ///< AC chrominance Huffman values. size_t huff_ncode; ///< Number of current entries in the buffer. MJpegHuffmanCode *huff_buffer; ///< Buffer for Huffman code values. } MJpegContext; /** * Enum for the Huffman encoding strategy. */ enum HuffmanTableOption { HUFFMAN_TABLE_DEFAULT = 0, ///< Use the default Huffman tables. HUFFMAN_TABLE_OPTIMAL = 1, ///< Compute and use optimal Huffman tables. NB_HUFFMAN_TABLE_OPTION = 2 }; static inline void put_marker(PutBitContext *p, enum JpegMarker code) { put_bits(p, 8, 0xff); put_bits(p, 8, code); } int ff_mjpeg_encode_init(MpegEncContext *s); void ff_mjpeg_encode_close(MpegEncContext *s); void ff_mjpeg_encode_mb(MpegEncContext *s, int16_t block[12][64]); #endif /* AVCODEC_MJPEGENC_H */