2 * lossless JPEG encoder
3 * Copyright (c) 2000, 2001 Fabrice Bellard
4 * Copyright (c) 2003 Alex Beregszaszi
5 * Copyright (c) 2003-2004 Michael Niedermayer
7 * Support for external huffman table, various fixes (AVID workaround),
8 * aspecting, new decode_frame mechanism and apple mjpeg-b support
11 * This file is part of FFmpeg.
13 * FFmpeg is free software; you can redistribute it and/or
14 * modify it under the terms of the GNU Lesser General Public
15 * License as published by the Free Software Foundation; either
16 * version 2.1 of the License, or (at your option) any later version.
18 * FFmpeg is distributed in the hope that it will be useful,
19 * but WITHOUT ANY WARRANTY; without even the implied warranty of
20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
21 * Lesser General Public License for more details.
23 * You should have received a copy of the GNU Lesser General Public
24 * License along with FFmpeg; if not, write to the Free Software
25 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
30 * lossless JPEG encoder.
35 #include "mpegvideo.h"
40 static int encode_picture_lossless(AVCodecContext *avctx, unsigned char *buf, int buf_size, void *data){
41 MpegEncContext * const s = avctx->priv_data;
42 MJpegContext * const m = s->mjpeg_ctx;
44 const int width= s->width;
45 const int height= s->height;
46 AVFrame * const p= (AVFrame*)&s->current_picture;
47 const int predictor= avctx->prediction_method+1;
49 init_put_bits(&s->pb, buf, buf_size);
52 p->pict_type= AV_PICTURE_TYPE_I;
55 ff_mjpeg_encode_picture_header(s);
57 s->header_bits= put_bits_count(&s->pb);
59 if(avctx->pix_fmt == PIX_FMT_BGR0
60 || avctx->pix_fmt == PIX_FMT_BGRA
61 || avctx->pix_fmt == PIX_FMT_BGR24){
63 const int linesize= p->linesize[0];
64 uint16_t (*buffer)[4]= (void *) s->rd_scratchpad;
65 int left[3], top[3], topleft[3];
68 buffer[0][i]= 1 << (9 - 1);
71 for(y = 0; y < height; y++) {
72 const int modified_predictor= y ? predictor : 1;
73 uint8_t *ptr = p->data[0] + (linesize * y);
75 if(s->pb.buf_end - s->pb.buf - (put_bits_count(&s->pb)>>3) < width*3*4){
76 av_log(s->avctx, AV_LOG_ERROR, "encoded frame too large\n");
81 top[i]= left[i]= topleft[i]= buffer[0][i];
83 for(x = 0; x < width; x++) {
84 if(avctx->pix_fmt == PIX_FMT_BGR24){
85 buffer[x][1] = ptr[3*x+0] - ptr[3*x+1] + 0x100;
86 buffer[x][2] = ptr[3*x+2] - ptr[3*x+1] + 0x100;
87 buffer[x][0] = (ptr[3*x+0] + 2*ptr[3*x+1] + ptr[3*x+2])>>2;
89 buffer[x][1] = ptr[4*x+0] - ptr[4*x+1] + 0x100;
90 buffer[x][2] = ptr[4*x+2] - ptr[4*x+1] + 0x100;
91 buffer[x][0] = (ptr[4*x+0] + 2*ptr[4*x+1] + ptr[4*x+2])>>2;
97 PREDICT(pred, topleft[i], top[i], left[i], modified_predictor);
100 top[i]= buffer[x+1][i];
102 left[i]= buffer[x][i];
104 diff= ((left[i] - pred + 0x100)&0x1FF) - 0x100;
107 ff_mjpeg_encode_dc(s, diff, m->huff_size_dc_luminance, m->huff_code_dc_luminance); //FIXME ugly
109 ff_mjpeg_encode_dc(s, diff, m->huff_size_dc_chrominance, m->huff_code_dc_chrominance);
115 const int mb_width = (width + s->mjpeg_hsample[0] - 1) / s->mjpeg_hsample[0];
116 const int mb_height = (height + s->mjpeg_vsample[0] - 1) / s->mjpeg_vsample[0];
118 for(mb_y = 0; mb_y < mb_height; mb_y++) {
119 if(s->pb.buf_end - s->pb.buf - (put_bits_count(&s->pb)>>3) < mb_width * 4 * 3 * s->mjpeg_hsample[0] * s->mjpeg_vsample[0]){
120 av_log(s->avctx, AV_LOG_ERROR, "encoded frame too large\n");
123 for(mb_x = 0; mb_x < mb_width; mb_x++) {
124 if(mb_x==0 || mb_y==0){
127 int x, y, h, v, linesize;
128 h = s->mjpeg_hsample[i];
129 v = s->mjpeg_vsample[i];
130 linesize= p->linesize[i];
136 ptr = p->data[i] + (linesize * (v * mb_y + y)) + (h * mb_x + x); //FIXME optimize this crap
145 pred= ptr[-linesize];
147 PREDICT(pred, ptr[-linesize-1], ptr[-linesize], ptr[-1], predictor);
152 ff_mjpeg_encode_dc(s, *ptr - pred, m->huff_size_dc_luminance, m->huff_code_dc_luminance); //FIXME ugly
154 ff_mjpeg_encode_dc(s, *ptr - pred, m->huff_size_dc_chrominance, m->huff_code_dc_chrominance);
161 int x, y, h, v, linesize;
162 h = s->mjpeg_hsample[i];
163 v = s->mjpeg_vsample[i];
164 linesize= p->linesize[i];
170 ptr = p->data[i] + (linesize * (v * mb_y + y)) + (h * mb_x + x); //FIXME optimize this crap
171 //printf("%d %d %d %d %8X\n", mb_x, mb_y, x, y, ptr);
172 PREDICT(pred, ptr[-linesize-1], ptr[-linesize], ptr[-1], predictor);
175 ff_mjpeg_encode_dc(s, *ptr - pred, m->huff_size_dc_luminance, m->huff_code_dc_luminance); //FIXME ugly
177 ff_mjpeg_encode_dc(s, *ptr - pred, m->huff_size_dc_chrominance, m->huff_code_dc_chrominance);
188 ff_mjpeg_encode_picture_trailer(s);
191 flush_put_bits(&s->pb);
192 return put_bits_ptr(&s->pb) - s->pb.buf;
193 // return (put_bits_count(&f->pb)+7)/8;
197 AVCodec ff_ljpeg_encoder = { //FIXME avoid MPV_* lossless JPEG should not need them
199 .type = AVMEDIA_TYPE_VIDEO,
200 .id = CODEC_ID_LJPEG,
201 .priv_data_size = sizeof(MpegEncContext),
202 .init = ff_MPV_encode_init,
203 .encode = encode_picture_lossless,
204 .close = ff_MPV_encode_end,
205 .long_name = NULL_IF_CONFIG_SMALL("Lossless JPEG"),