mirror of
https://git.videolan.org/git/ffmpeg.git
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459 lines
13 KiB
C
459 lines
13 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 Libav.
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*
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* Libav 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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* Libav 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 Libav; 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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//#define DEBUG
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#include <assert.h>
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#include "avcodec.h"
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#include "dsputil.h"
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#include "mpegvideo.h"
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#include "mjpeg.h"
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#include "mjpegenc.h"
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/* use two quantizer tables (one for luminance and one for chrominance) */
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/* not yet working */
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#undef TWOMATRIXES
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av_cold int ff_mjpeg_encode_init(MpegEncContext *s)
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{
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MJpegContext *m;
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m = av_malloc(sizeof(MJpegContext));
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if (!m)
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return -1;
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s->min_qcoeff=-1023;
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s->max_qcoeff= 1023;
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/* build all the huffman tables */
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ff_mjpeg_build_huffman_codes(m->huff_size_dc_luminance,
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m->huff_code_dc_luminance,
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ff_mjpeg_bits_dc_luminance,
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ff_mjpeg_val_dc);
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ff_mjpeg_build_huffman_codes(m->huff_size_dc_chrominance,
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m->huff_code_dc_chrominance,
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ff_mjpeg_bits_dc_chrominance,
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ff_mjpeg_val_dc);
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ff_mjpeg_build_huffman_codes(m->huff_size_ac_luminance,
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m->huff_code_ac_luminance,
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ff_mjpeg_bits_ac_luminance,
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ff_mjpeg_val_ac_luminance);
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ff_mjpeg_build_huffman_codes(m->huff_size_ac_chrominance,
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m->huff_code_ac_chrominance,
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ff_mjpeg_bits_ac_chrominance,
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ff_mjpeg_val_ac_chrominance);
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s->mjpeg_ctx = m;
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return 0;
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}
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void ff_mjpeg_encode_close(MpegEncContext *s)
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{
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av_free(s->mjpeg_ctx);
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}
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/* table_class: 0 = DC coef, 1 = AC coefs */
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static int put_huffman_table(MpegEncContext *s, int table_class, int table_id,
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const uint8_t *bits_table, const uint8_t *value_table)
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{
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PutBitContext *p = &s->pb;
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int n, i;
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put_bits(p, 4, table_class);
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put_bits(p, 4, table_id);
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n = 0;
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for(i=1;i<=16;i++) {
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n += bits_table[i];
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put_bits(p, 8, bits_table[i]);
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}
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for(i=0;i<n;i++)
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put_bits(p, 8, value_table[i]);
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return n + 17;
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}
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static void jpeg_table_header(MpegEncContext *s)
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{
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PutBitContext *p = &s->pb;
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int i, j, size;
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uint8_t *ptr;
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/* quant matrixes */
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put_marker(p, DQT);
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#ifdef TWOMATRIXES
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put_bits(p, 16, 2 + 2 * (1 + 64));
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#else
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put_bits(p, 16, 2 + 1 * (1 + 64));
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#endif
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put_bits(p, 4, 0); /* 8 bit precision */
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put_bits(p, 4, 0); /* table 0 */
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for(i=0;i<64;i++) {
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j = s->intra_scantable.permutated[i];
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put_bits(p, 8, s->intra_matrix[j]);
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}
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#ifdef TWOMATRIXES
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put_bits(p, 4, 0); /* 8 bit precision */
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put_bits(p, 4, 1); /* table 1 */
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for(i=0;i<64;i++) {
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j = s->intra_scantable.permutated[i];
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put_bits(p, 8, s->chroma_intra_matrix[j]);
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}
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#endif
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/* huffman table */
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put_marker(p, DHT);
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flush_put_bits(p);
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ptr = put_bits_ptr(p);
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put_bits(p, 16, 0); /* patched later */
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size = 2;
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size += put_huffman_table(s, 0, 0, ff_mjpeg_bits_dc_luminance,
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ff_mjpeg_val_dc);
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size += put_huffman_table(s, 0, 1, ff_mjpeg_bits_dc_chrominance,
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ff_mjpeg_val_dc);
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size += put_huffman_table(s, 1, 0, ff_mjpeg_bits_ac_luminance,
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ff_mjpeg_val_ac_luminance);
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size += put_huffman_table(s, 1, 1, ff_mjpeg_bits_ac_chrominance,
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ff_mjpeg_val_ac_chrominance);
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AV_WB16(ptr, size);
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}
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static void jpeg_put_comments(MpegEncContext *s)
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{
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PutBitContext *p = &s->pb;
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int size;
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uint8_t *ptr;
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if (s->aspect_ratio_info /* && !lossless */)
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{
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/* JFIF header */
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put_marker(p, APP0);
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put_bits(p, 16, 16);
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ff_put_string(p, "JFIF", 1); /* this puts the trailing zero-byte too */
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put_bits(p, 16, 0x0201); /* v 1.02 */
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put_bits(p, 8, 0); /* units type: 0 - aspect ratio */
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put_bits(p, 16, s->avctx->sample_aspect_ratio.num);
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put_bits(p, 16, s->avctx->sample_aspect_ratio.den);
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put_bits(p, 8, 0); /* thumbnail width */
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put_bits(p, 8, 0); /* thumbnail height */
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}
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/* comment */
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if(!(s->flags & CODEC_FLAG_BITEXACT)){
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put_marker(p, COM);
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flush_put_bits(p);
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ptr = put_bits_ptr(p);
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put_bits(p, 16, 0); /* patched later */
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ff_put_string(p, LIBAVCODEC_IDENT, 1);
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size = strlen(LIBAVCODEC_IDENT)+3;
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AV_WB16(ptr, size);
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}
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if( s->avctx->pix_fmt == PIX_FMT_YUV420P
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||s->avctx->pix_fmt == PIX_FMT_YUV422P
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||s->avctx->pix_fmt == PIX_FMT_YUV444P){
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put_marker(p, COM);
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flush_put_bits(p);
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ptr = put_bits_ptr(p);
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put_bits(p, 16, 0); /* patched later */
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ff_put_string(p, "CS=ITU601", 1);
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size = strlen("CS=ITU601")+3;
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AV_WB16(ptr, size);
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}
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}
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void ff_mjpeg_encode_picture_header(MpegEncContext *s)
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{
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const int lossless= s->avctx->codec_id != CODEC_ID_MJPEG;
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put_marker(&s->pb, SOI);
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jpeg_put_comments(s);
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jpeg_table_header(s);
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switch(s->avctx->codec_id){
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case CODEC_ID_MJPEG: put_marker(&s->pb, SOF0 ); break;
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case CODEC_ID_LJPEG: put_marker(&s->pb, SOF3 ); break;
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default: assert(0);
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}
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put_bits(&s->pb, 16, 17);
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if(lossless && s->avctx->pix_fmt == PIX_FMT_BGRA)
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put_bits(&s->pb, 8, 9); /* 9 bits/component RCT */
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else
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put_bits(&s->pb, 8, 8); /* 8 bits/component */
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put_bits(&s->pb, 16, s->height);
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put_bits(&s->pb, 16, s->width);
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put_bits(&s->pb, 8, 3); /* 3 components */
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/* Y component */
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put_bits(&s->pb, 8, 1); /* component number */
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put_bits(&s->pb, 4, s->mjpeg_hsample[0]); /* H factor */
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put_bits(&s->pb, 4, s->mjpeg_vsample[0]); /* V factor */
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put_bits(&s->pb, 8, 0); /* select matrix */
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/* Cb component */
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put_bits(&s->pb, 8, 2); /* component number */
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put_bits(&s->pb, 4, s->mjpeg_hsample[1]); /* H factor */
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put_bits(&s->pb, 4, s->mjpeg_vsample[1]); /* V factor */
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#ifdef TWOMATRIXES
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put_bits(&s->pb, 8, lossless ? 0 : 1); /* select matrix */
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#else
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put_bits(&s->pb, 8, 0); /* select matrix */
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#endif
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/* Cr component */
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put_bits(&s->pb, 8, 3); /* component number */
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put_bits(&s->pb, 4, s->mjpeg_hsample[2]); /* H factor */
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put_bits(&s->pb, 4, s->mjpeg_vsample[2]); /* V factor */
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#ifdef TWOMATRIXES
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put_bits(&s->pb, 8, lossless ? 0 : 1); /* select matrix */
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#else
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put_bits(&s->pb, 8, 0); /* select matrix */
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#endif
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/* scan header */
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put_marker(&s->pb, SOS);
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put_bits(&s->pb, 16, 12); /* length */
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put_bits(&s->pb, 8, 3); /* 3 components */
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/* Y component */
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put_bits(&s->pb, 8, 1); /* index */
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put_bits(&s->pb, 4, 0); /* DC huffman table index */
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put_bits(&s->pb, 4, 0); /* AC huffman table index */
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/* Cb component */
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put_bits(&s->pb, 8, 2); /* index */
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put_bits(&s->pb, 4, 1); /* DC huffman table index */
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put_bits(&s->pb, 4, lossless ? 0 : 1); /* AC huffman table index */
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/* Cr component */
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put_bits(&s->pb, 8, 3); /* index */
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put_bits(&s->pb, 4, 1); /* DC huffman table index */
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put_bits(&s->pb, 4, lossless ? 0 : 1); /* AC huffman table index */
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put_bits(&s->pb, 8, lossless ? s->avctx->prediction_method+1 : 0); /* Ss (not used) */
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switch(s->avctx->codec_id){
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case CODEC_ID_MJPEG: put_bits(&s->pb, 8, 63); break; /* Se (not used) */
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case CODEC_ID_LJPEG: put_bits(&s->pb, 8, 0); break; /* not used */
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default: assert(0);
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}
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put_bits(&s->pb, 8, 0); /* Ah/Al (not used) */
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}
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static void escape_FF(MpegEncContext *s, int start)
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{
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int size= put_bits_count(&s->pb) - start*8;
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int i, ff_count;
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uint8_t *buf= s->pb.buf + start;
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int align= (-(size_t)(buf))&3;
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assert((size&7) == 0);
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size >>= 3;
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ff_count=0;
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for(i=0; i<size && i<align; i++){
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if(buf[i]==0xFF) ff_count++;
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}
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for(; i<size-15; i+=16){
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int acc, v;
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v= *(uint32_t*)(&buf[i]);
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acc= (((v & (v>>4))&0x0F0F0F0F)+0x01010101)&0x10101010;
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v= *(uint32_t*)(&buf[i+4]);
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acc+=(((v & (v>>4))&0x0F0F0F0F)+0x01010101)&0x10101010;
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v= *(uint32_t*)(&buf[i+8]);
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acc+=(((v & (v>>4))&0x0F0F0F0F)+0x01010101)&0x10101010;
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v= *(uint32_t*)(&buf[i+12]);
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acc+=(((v & (v>>4))&0x0F0F0F0F)+0x01010101)&0x10101010;
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acc>>=4;
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acc+= (acc>>16);
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acc+= (acc>>8);
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ff_count+= acc&0xFF;
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}
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for(; i<size; i++){
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if(buf[i]==0xFF) ff_count++;
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}
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if(ff_count==0) return;
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flush_put_bits(&s->pb);
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skip_put_bytes(&s->pb, ff_count);
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for(i=size-1; ff_count; i--){
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int v= buf[i];
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if(v==0xFF){
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//printf("%d %d\n", i, ff_count);
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buf[i+ff_count]= 0;
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ff_count--;
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}
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buf[i+ff_count]= v;
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}
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}
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void ff_mjpeg_encode_stuffing(PutBitContext * pbc)
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{
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int length;
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length= (-put_bits_count(pbc))&7;
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if(length) put_bits(pbc, length, (1<<length)-1);
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}
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void ff_mjpeg_encode_picture_trailer(MpegEncContext *s)
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{
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ff_mjpeg_encode_stuffing(&s->pb);
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flush_put_bits(&s->pb);
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assert((s->header_bits&7)==0);
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escape_FF(s, s->header_bits>>3);
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put_marker(&s->pb, EOI);
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}
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void ff_mjpeg_encode_dc(MpegEncContext *s, int val,
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uint8_t *huff_size, uint16_t *huff_code)
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{
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int mant, nbits;
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if (val == 0) {
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put_bits(&s->pb, huff_size[0], huff_code[0]);
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} else {
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mant = val;
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if (val < 0) {
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val = -val;
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mant--;
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}
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nbits= av_log2_16bit(val) + 1;
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put_bits(&s->pb, huff_size[nbits], huff_code[nbits]);
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put_sbits(&s->pb, nbits, mant);
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}
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}
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static void encode_block(MpegEncContext *s, DCTELEM *block, int n)
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{
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int mant, nbits, code, i, j;
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int component, dc, run, last_index, val;
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MJpegContext *m = s->mjpeg_ctx;
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uint8_t *huff_size_ac;
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uint16_t *huff_code_ac;
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/* DC coef */
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component = (n <= 3 ? 0 : (n&1) + 1);
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dc = block[0]; /* overflow is impossible */
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val = dc - s->last_dc[component];
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if (n < 4) {
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ff_mjpeg_encode_dc(s, val, m->huff_size_dc_luminance, m->huff_code_dc_luminance);
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huff_size_ac = m->huff_size_ac_luminance;
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huff_code_ac = m->huff_code_ac_luminance;
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} else {
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ff_mjpeg_encode_dc(s, val, m->huff_size_dc_chrominance, m->huff_code_dc_chrominance);
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huff_size_ac = m->huff_size_ac_chrominance;
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huff_code_ac = m->huff_code_ac_chrominance;
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}
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s->last_dc[component] = dc;
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/* AC coefs */
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run = 0;
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last_index = s->block_last_index[n];
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for(i=1;i<=last_index;i++) {
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j = s->intra_scantable.permutated[i];
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val = block[j];
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if (val == 0) {
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run++;
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} else {
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while (run >= 16) {
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put_bits(&s->pb, huff_size_ac[0xf0], huff_code_ac[0xf0]);
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run -= 16;
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}
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mant = val;
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if (val < 0) {
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val = -val;
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mant--;
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}
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nbits= av_log2(val) + 1;
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code = (run << 4) | nbits;
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put_bits(&s->pb, huff_size_ac[code], huff_code_ac[code]);
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put_sbits(&s->pb, nbits, mant);
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run = 0;
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}
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}
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/* output EOB only if not already 64 values */
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if (last_index < 63 || run != 0)
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put_bits(&s->pb, huff_size_ac[0], huff_code_ac[0]);
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}
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void ff_mjpeg_encode_mb(MpegEncContext *s, DCTELEM block[6][64])
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{
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int i;
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for(i=0;i<5;i++) {
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encode_block(s, block[i], i);
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}
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if (s->chroma_format == CHROMA_420) {
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encode_block(s, block[5], 5);
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} else {
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encode_block(s, block[6], 6);
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encode_block(s, block[5], 5);
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encode_block(s, block[7], 7);
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}
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s->i_tex_bits += get_bits_diff(s);
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}
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AVCodec ff_mjpeg_encoder = {
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.name = "mjpeg",
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.type = AVMEDIA_TYPE_VIDEO,
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.id = CODEC_ID_MJPEG,
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.priv_data_size = sizeof(MpegEncContext),
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.init = MPV_encode_init,
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.encode = MPV_encode_picture,
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.close = MPV_encode_end,
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.pix_fmts= (const enum PixelFormat[]){PIX_FMT_YUVJ420P, PIX_FMT_YUVJ422P, PIX_FMT_NONE},
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.long_name= NULL_IF_CONFIG_SMALL("MJPEG (Motion JPEG)"),
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};
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