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a064d34a32
Many of the fields of MpegEncContext (which is also used by decoders)
are actually only used by encoders. Therefore this commit adds
a new encoder-only structure and moves all of the encoder-only
fields to it except for those which require more explicit
synchronisation between the main slice context and the other
slice contexts. This synchronisation is currently mainly provided
by ff_update_thread_context() which simply copies most of
the main slice context over the other slice contexts. Fields
which are moved to the new MPVEncContext no longer participate
in this (which is desired, because it is horrible and for the
fields b) below wasteful) which means that some fields can only
be moved when explicit synchronisation code is added in later commits.
More explicitly, this commit moves the following fields:
a) Fields not copied by ff_update_duplicate_context():
dct_error_sum and dct_count; the former does not need synchronisation,
the latter is synchronised in merge_context_after_encode().
b) Fields which do not change after initialisation (these fields
could also be put into MPVMainEncContext at the cost of
an indirection to access them): lambda_table, adaptive_quant,
{luma,chroma}_elim_threshold, new_pic, fdsp, mpvencdsp, pdsp,
{p,b_forw,b_back,b_bidir_forw,b_bidir_back,b_direct,b_field}_mv_table,
[pb]_field_select_table, mb_{type,var,mean}, mc_mb_var, {min,max}_qcoeff,
{inter,intra}_quant_bias, ac_esc_length, the *_vlc_length fields,
the q_{intra,inter,chroma_intra}_matrix{,16}, dct_offset, mb_info,
mjpeg_ctx, rtp_mode, rtp_payload_size, encode_mb, all function
pointers, mpv_flags, quantizer_noise_shaping,
frame_reconstruction_bitfield, error_rate and intra_penalty.
c) Fields which are already (re)set explicitly: The PutBitContexts
pb, tex_pb, pb2; dquant, skipdct, encoding_error, the statistics
fields {mv,i_tex,p_tex,misc,last}_bits and i_count; last_mv_dir,
esc_pos (reset when writing the header).
d) Fields which are only used by encoders not supporting slice
threading for which synchronisation doesn't matter: esc3_level_length
and the remaining mb_info fields.
e) coded_score: This field is only really used when FF_MPV_FLAG_CBP_RD
is set (which implies trellis) and even then it is only used for
non-intra blocks. For these blocks dct_quantize_trellis_c() either
sets coded_score[n] or returns a last_non_zero value of -1
in which case coded_score will be reset in encode_mb_internal().
Therefore no old values are ever used.
The MotionEstContext has not been moved yet.
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
100 lines
3.6 KiB
C
100 lines
3.6 KiB
C
/*
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* MJPEG encoder
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* Copyright (c) 2000, 2001 Fabrice Bellard
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* Copyright (c) 2003 Alex Beregszaszi
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* Copyright (c) 2003-2004 Michael Niedermayer
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*
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* Support for external huffman table, various fixes (AVID workaround),
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* aspecting, new decode_frame mechanism and apple mjpeg-b support
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* by Alex Beregszaszi
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file
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* MJPEG encoder.
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*/
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#ifndef AVCODEC_MJPEGENC_H
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#define AVCODEC_MJPEGENC_H
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#include <stdint.h>
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#include "mjpeg.h"
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#include "put_bits.h"
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/**
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* Holds JPEG frame data and Huffman table data.
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*/
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typedef struct MJpegContext {
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int huffman;
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/* Force duplication of mjpeg matrices, useful for rtp streaming */
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int force_duplicated_matrix;
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//FIXME use array [3] instead of lumi / chroma, for easier addressing
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uint8_t huff_size_dc_luminance[12]; ///< DC luminance Huffman table size.
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uint16_t huff_code_dc_luminance[12]; ///< DC luminance Huffman table codes.
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uint8_t huff_size_dc_chrominance[12]; ///< DC chrominance Huffman table size.
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uint16_t huff_code_dc_chrominance[12]; ///< DC chrominance Huffman table codes.
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uint8_t huff_size_ac_luminance[256]; ///< AC luminance Huffman table size.
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uint16_t huff_code_ac_luminance[256]; ///< AC luminance Huffman table codes.
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uint8_t huff_size_ac_chrominance[256]; ///< AC chrominance Huffman table size.
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uint16_t huff_code_ac_chrominance[256]; ///< AC chrominance Huffman table codes.
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/** Storage for AC luminance VLC */
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uint8_t uni_ac_vlc_len[64 * 64 * 2];
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/** Storage for AC chrominance VLC */
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uint8_t uni_chroma_ac_vlc_len[64 * 64 * 2];
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// Default DC tables have exactly 12 values
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uint8_t bits_dc_luminance[17]; ///< DC luminance Huffman bits.
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uint8_t val_dc_luminance[12]; ///< DC luminance Huffman values.
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uint8_t bits_dc_chrominance[17]; ///< DC chrominance Huffman bits.
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uint8_t val_dc_chrominance[12]; ///< DC chrominance Huffman values.
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// 8-bit JPEG has max 256 values
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uint8_t bits_ac_luminance[17]; ///< AC luminance Huffman bits.
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uint8_t val_ac_luminance[256]; ///< AC luminance Huffman values.
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uint8_t bits_ac_chrominance[17]; ///< AC chrominance Huffman bits.
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uint8_t val_ac_chrominance[256]; ///< AC chrominance Huffman values.
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size_t huff_ncode; ///< Number of current entries in the buffer.
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struct MJpegHuffmanCode *huff_buffer; ///< Buffer for Huffman code values.
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} MJpegContext;
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/**
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* Enum for the Huffman encoding strategy.
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*/
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enum HuffmanTableOption {
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HUFFMAN_TABLE_DEFAULT = 0, ///< Use the default Huffman tables.
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HUFFMAN_TABLE_OPTIMAL = 1, ///< Compute and use optimal Huffman tables.
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NB_HUFFMAN_TABLE_OPTION = 2
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};
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static inline void put_marker(PutBitContext *p, enum JpegMarker code)
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{
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put_bits(p, 8, 0xff);
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put_bits(p, 8, code);
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}
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typedef struct MPVEncContext MPVEncContext;
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int ff_mjpeg_encode_stuffing(MPVEncContext *s);
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#endif /* AVCODEC_MJPEGENC_H */
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