217 lines
8.0 KiB
C
217 lines
8.0 KiB
C
/*
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* lossless JPEG 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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* lossless JPEG encoder.
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*/
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#include "avcodec.h"
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#include "dsputil.h"
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#include "internal.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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static int encode_picture_lossless(AVCodecContext *avctx, AVPacket *pkt,
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const AVFrame *pict, int *got_packet)
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{
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MpegEncContext * const s = avctx->priv_data;
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MJpegContext * const m = s->mjpeg_ctx;
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const int width= s->width;
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const int height= s->height;
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AVFrame * const p = &s->current_picture.f;
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const int predictor= avctx->prediction_method+1;
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const int mb_width = (width + s->mjpeg_hsample[0] - 1) / s->mjpeg_hsample[0];
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const int mb_height = (height + s->mjpeg_vsample[0] - 1) / s->mjpeg_vsample[0];
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int ret, max_pkt_size = FF_MIN_BUFFER_SIZE;
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if (avctx->pix_fmt == PIX_FMT_BGRA)
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max_pkt_size += width * height * 3 * 4;
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else {
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max_pkt_size += mb_width * mb_height * 3 * 4
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* s->mjpeg_hsample[0] * s->mjpeg_vsample[0];
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}
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if ((ret = ff_alloc_packet(pkt, max_pkt_size)) < 0) {
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av_log(avctx, AV_LOG_ERROR, "Error getting output packet of size %d.\n", max_pkt_size);
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return ret;
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}
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init_put_bits(&s->pb, pkt->data, pkt->size);
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*p = *pict;
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p->pict_type= AV_PICTURE_TYPE_I;
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p->key_frame= 1;
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ff_mjpeg_encode_picture_header(s);
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s->header_bits= put_bits_count(&s->pb);
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if(avctx->pix_fmt == PIX_FMT_BGRA){
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int x, y, i;
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const int linesize= p->linesize[0];
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uint16_t (*buffer)[4]= (void *) s->rd_scratchpad;
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int left[3], top[3], topleft[3];
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for(i=0; i<3; i++){
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buffer[0][i]= 1 << (9 - 1);
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}
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for(y = 0; y < height; y++) {
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const int modified_predictor= y ? predictor : 1;
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uint8_t *ptr = p->data[0] + (linesize * y);
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if(s->pb.buf_end - s->pb.buf - (put_bits_count(&s->pb)>>3) < width*3*4){
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av_log(s->avctx, AV_LOG_ERROR, "encoded frame too large\n");
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return -1;
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}
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for(i=0; i<3; i++){
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top[i]= left[i]= topleft[i]= buffer[0][i];
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}
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for(x = 0; x < width; x++) {
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buffer[x][1] = ptr[4*x+0] - ptr[4*x+1] + 0x100;
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buffer[x][2] = ptr[4*x+2] - ptr[4*x+1] + 0x100;
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buffer[x][0] = (ptr[4*x+0] + 2*ptr[4*x+1] + ptr[4*x+2])>>2;
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for(i=0;i<3;i++) {
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int pred, diff;
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PREDICT(pred, topleft[i], top[i], left[i], modified_predictor);
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topleft[i]= top[i];
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top[i]= buffer[x+1][i];
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left[i]= buffer[x][i];
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diff= ((left[i] - pred + 0x100)&0x1FF) - 0x100;
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if(i==0)
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ff_mjpeg_encode_dc(s, diff, m->huff_size_dc_luminance, m->huff_code_dc_luminance); //FIXME ugly
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else
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ff_mjpeg_encode_dc(s, diff, m->huff_size_dc_chrominance, m->huff_code_dc_chrominance);
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}
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}
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}
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}else{
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int mb_x, mb_y, i;
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for(mb_y = 0; mb_y < mb_height; mb_y++) {
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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]){
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av_log(s->avctx, AV_LOG_ERROR, "encoded frame too large\n");
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return -1;
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}
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for(mb_x = 0; mb_x < mb_width; mb_x++) {
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if(mb_x==0 || mb_y==0){
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for(i=0;i<3;i++) {
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uint8_t *ptr;
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int x, y, h, v, linesize;
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h = s->mjpeg_hsample[i];
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v = s->mjpeg_vsample[i];
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linesize= p->linesize[i];
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for(y=0; y<v; y++){
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for(x=0; x<h; x++){
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int pred;
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ptr = p->data[i] + (linesize * (v * mb_y + y)) + (h * mb_x + x); //FIXME optimize this crap
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if(y==0 && mb_y==0){
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if(x==0 && mb_x==0){
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pred= 128;
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}else{
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pred= ptr[-1];
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}
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}else{
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if(x==0 && mb_x==0){
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pred= ptr[-linesize];
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}else{
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PREDICT(pred, ptr[-linesize-1], ptr[-linesize], ptr[-1], predictor);
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}
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}
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if(i==0)
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ff_mjpeg_encode_dc(s, *ptr - pred, m->huff_size_dc_luminance, m->huff_code_dc_luminance); //FIXME ugly
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else
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ff_mjpeg_encode_dc(s, *ptr - pred, m->huff_size_dc_chrominance, m->huff_code_dc_chrominance);
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}
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}
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}
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}else{
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for(i=0;i<3;i++) {
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uint8_t *ptr;
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int x, y, h, v, linesize;
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h = s->mjpeg_hsample[i];
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v = s->mjpeg_vsample[i];
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linesize= p->linesize[i];
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for(y=0; y<v; y++){
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for(x=0; x<h; x++){
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int pred;
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ptr = p->data[i] + (linesize * (v * mb_y + y)) + (h * mb_x + x); //FIXME optimize this crap
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//printf("%d %d %d %d %8X\n", mb_x, mb_y, x, y, ptr);
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PREDICT(pred, ptr[-linesize-1], ptr[-linesize], ptr[-1], predictor);
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if(i==0)
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ff_mjpeg_encode_dc(s, *ptr - pred, m->huff_size_dc_luminance, m->huff_code_dc_luminance); //FIXME ugly
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else
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ff_mjpeg_encode_dc(s, *ptr - pred, m->huff_size_dc_chrominance, m->huff_code_dc_chrominance);
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}
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}
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}
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}
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}
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}
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}
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emms_c();
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ff_mjpeg_encode_picture_trailer(s);
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s->picture_number++;
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flush_put_bits(&s->pb);
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pkt->size = put_bits_ptr(&s->pb) - s->pb.buf;
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pkt->flags |= AV_PKT_FLAG_KEY;
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*got_packet = 1;
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return 0;
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// return (put_bits_count(&f->pb)+7)/8;
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}
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AVCodec ff_ljpeg_encoder = { //FIXME avoid MPV_* lossless JPEG should not need them
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.name = "ljpeg",
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.type = AVMEDIA_TYPE_VIDEO,
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.id = CODEC_ID_LJPEG,
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.priv_data_size = sizeof(MpegEncContext),
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.init = ff_MPV_encode_init,
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.encode2 = encode_picture_lossless,
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.close = ff_MPV_encode_end,
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.long_name = NULL_IF_CONFIG_SMALL("Lossless JPEG"),
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};
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