yading@10: /*
yading@10:  * lossless JPEG encoder
yading@10:  * Copyright (c) 2000, 2001 Fabrice Bellard
yading@10:  * Copyright (c) 2003 Alex Beregszaszi
yading@10:  * Copyright (c) 2003-2004 Michael Niedermayer
yading@10:  *
yading@10:  * Support for external huffman table, various fixes (AVID workaround),
yading@10:  * aspecting, new decode_frame mechanism and apple mjpeg-b support
yading@10:  *                                  by Alex Beregszaszi
yading@10:  *
yading@10:  * This file is part of FFmpeg.
yading@10:  *
yading@10:  * FFmpeg is free software; you can redistribute it and/or
yading@10:  * modify it under the terms of the GNU Lesser General Public
yading@10:  * License as published by the Free Software Foundation; either
yading@10:  * version 2.1 of the License, or (at your option) any later version.
yading@10:  *
yading@10:  * FFmpeg is distributed in the hope that it will be useful,
yading@10:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
yading@10:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
yading@10:  * Lesser General Public License for more details.
yading@10:  *
yading@10:  * You should have received a copy of the GNU Lesser General Public
yading@10:  * License along with FFmpeg; if not, write to the Free Software
yading@10:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
yading@10:  */
yading@10: 
yading@10: /**
yading@10:  * @file
yading@10:  * lossless JPEG encoder.
yading@10:  */
yading@10: 
yading@10: #include "avcodec.h"
yading@10: #include "internal.h"
yading@10: #include "mpegvideo.h"
yading@10: #include "mjpeg.h"
yading@10: #include "mjpegenc.h"
yading@10: 
yading@10: 
yading@10: static int encode_picture_lossless(AVCodecContext *avctx, AVPacket *pkt,
yading@10:                                    const AVFrame *pict, int *got_packet)
yading@10: {
yading@10:     MpegEncContext * const s = avctx->priv_data;
yading@10:     MJpegContext * const m = s->mjpeg_ctx;
yading@10:     const int width= s->width;
yading@10:     const int height= s->height;
yading@10:     AVFrame * const p = &s->current_picture.f;
yading@10:     const int predictor= avctx->prediction_method+1;
yading@10:     const int mb_width  = (width  + s->mjpeg_hsample[0] - 1) / s->mjpeg_hsample[0];
yading@10:     const int mb_height = (height + s->mjpeg_vsample[0] - 1) / s->mjpeg_vsample[0];
yading@10:     int ret, max_pkt_size = FF_MIN_BUFFER_SIZE;
yading@10: 
yading@10:     if (avctx->pix_fmt == AV_PIX_FMT_BGRA)
yading@10:         max_pkt_size += width * height * 3 * 4;
yading@10:     else {
yading@10:         max_pkt_size += mb_width * mb_height * 3 * 4
yading@10:                         * s->mjpeg_hsample[0] * s->mjpeg_vsample[0];
yading@10:     }
yading@10: 
yading@10:     if (!s->edge_emu_buffer &&
yading@10:         (ret = ff_mpv_frame_size_alloc(s, pict->linesize[0])) < 0) {
yading@10:         av_log(avctx, AV_LOG_ERROR, "failed to allocate context scratch buffers.\n");
yading@10:         return ret;
yading@10:     }
yading@10: 
yading@10:     if ((ret = ff_alloc_packet2(avctx, pkt, max_pkt_size)) < 0)
yading@10:         return ret;
yading@10: 
yading@10:     init_put_bits(&s->pb, pkt->data, pkt->size);
yading@10: 
yading@10:     av_frame_unref(p);
yading@10:     ret = av_frame_ref(p, pict);
yading@10:     if (ret < 0)
yading@10:         return ret;
yading@10:     p->pict_type= AV_PICTURE_TYPE_I;
yading@10:     p->key_frame= 1;
yading@10: 
yading@10:     ff_mjpeg_encode_picture_header(s);
yading@10: 
yading@10:     s->header_bits= put_bits_count(&s->pb);
yading@10: 
yading@10:     if(avctx->pix_fmt == AV_PIX_FMT_BGR0
yading@10:         || avctx->pix_fmt == AV_PIX_FMT_BGRA
yading@10:         || avctx->pix_fmt == AV_PIX_FMT_BGR24){
yading@10:         int x, y, i;
yading@10:         const int linesize= p->linesize[0];
yading@10:         uint16_t (*buffer)[4]= (void *) s->rd_scratchpad;
yading@10:         int left[3], top[3], topleft[3];
yading@10: 
yading@10:         for(i=0; i<3; i++){
yading@10:             buffer[0][i]= 1 << (9 - 1);
yading@10:         }
yading@10: 
yading@10:         for(y = 0; y < height; y++) {
yading@10:             const int modified_predictor= y ? predictor : 1;
yading@10:             uint8_t *ptr = p->data[0] + (linesize * y);
yading@10: 
yading@10:             if(s->pb.buf_end - s->pb.buf - (put_bits_count(&s->pb)>>3) < width*3*4){
yading@10:                 av_log(s->avctx, AV_LOG_ERROR, "encoded frame too large\n");
yading@10:                 return -1;
yading@10:             }
yading@10: 
yading@10:             for(i=0; i<3; i++){
yading@10:                 top[i]= left[i]= topleft[i]= buffer[0][i];
yading@10:             }
yading@10:             for(x = 0; x < width; x++) {
yading@10:                 if(avctx->pix_fmt == AV_PIX_FMT_BGR24){
yading@10:                     buffer[x][1] = ptr[3*x+0] - ptr[3*x+1] + 0x100;
yading@10:                     buffer[x][2] = ptr[3*x+2] - ptr[3*x+1] + 0x100;
yading@10:                     buffer[x][0] = (ptr[3*x+0] + 2*ptr[3*x+1] + ptr[3*x+2])>>2;
yading@10:                 }else{
yading@10:                 buffer[x][1] = ptr[4*x+0] - ptr[4*x+1] + 0x100;
yading@10:                 buffer[x][2] = ptr[4*x+2] - ptr[4*x+1] + 0x100;
yading@10:                 buffer[x][0] = (ptr[4*x+0] + 2*ptr[4*x+1] + ptr[4*x+2])>>2;
yading@10:                 }
yading@10: 
yading@10:                 for(i=0;i<3;i++) {
yading@10:                     int pred, diff;
yading@10: 
yading@10:                     PREDICT(pred, topleft[i], top[i], left[i], modified_predictor);
yading@10: 
yading@10:                     topleft[i]= top[i];
yading@10:                     top[i]= buffer[x+1][i];
yading@10: 
yading@10:                     left[i]= buffer[x][i];
yading@10: 
yading@10:                     diff= ((left[i] - pred + 0x100)&0x1FF) - 0x100;
yading@10: 
yading@10:                     if(i==0)
yading@10:                         ff_mjpeg_encode_dc(s, diff, m->huff_size_dc_luminance, m->huff_code_dc_luminance); //FIXME ugly
yading@10:                     else
yading@10:                         ff_mjpeg_encode_dc(s, diff, m->huff_size_dc_chrominance, m->huff_code_dc_chrominance);
yading@10:                 }
yading@10:             }
yading@10:         }
yading@10:     }else{
yading@10:         int mb_x, mb_y, i;
yading@10: 
yading@10:         for(mb_y = 0; mb_y < mb_height; mb_y++) {
yading@10:             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]){
yading@10:                 av_log(s->avctx, AV_LOG_ERROR, "encoded frame too large\n");
yading@10:                 return -1;
yading@10:             }
yading@10:             for(mb_x = 0; mb_x < mb_width; mb_x++) {
yading@10:                 if(mb_x==0 || mb_y==0){
yading@10:                     for(i=0;i<3;i++) {
yading@10:                         uint8_t *ptr;
yading@10:                         int x, y, h, v, linesize;
yading@10:                         h = s->mjpeg_hsample[i];
yading@10:                         v = s->mjpeg_vsample[i];
yading@10:                         linesize= p->linesize[i];
yading@10: 
yading@10:                         for(y=0; y<v; y++){
yading@10:                             for(x=0; x<h; x++){
yading@10:                                 int pred;
yading@10: 
yading@10:                                 ptr = p->data[i] + (linesize * (v * mb_y + y)) + (h * mb_x + x); //FIXME optimize this crap
yading@10:                                 if(y==0 && mb_y==0){
yading@10:                                     if(x==0 && mb_x==0){
yading@10:                                         pred= 128;
yading@10:                                     }else{
yading@10:                                         pred= ptr[-1];
yading@10:                                     }
yading@10:                                 }else{
yading@10:                                     if(x==0 && mb_x==0){
yading@10:                                         pred= ptr[-linesize];
yading@10:                                     }else{
yading@10:                                         PREDICT(pred, ptr[-linesize-1], ptr[-linesize], ptr[-1], predictor);
yading@10:                                     }
yading@10:                                 }
yading@10: 
yading@10:                                 if(i==0)
yading@10:                                     ff_mjpeg_encode_dc(s, *ptr - pred, m->huff_size_dc_luminance, m->huff_code_dc_luminance); //FIXME ugly
yading@10:                                 else
yading@10:                                     ff_mjpeg_encode_dc(s, *ptr - pred, m->huff_size_dc_chrominance, m->huff_code_dc_chrominance);
yading@10:                             }
yading@10:                         }
yading@10:                     }
yading@10:                 }else{
yading@10:                     for(i=0;i<3;i++) {
yading@10:                         uint8_t *ptr;
yading@10:                         int x, y, h, v, linesize;
yading@10:                         h = s->mjpeg_hsample[i];
yading@10:                         v = s->mjpeg_vsample[i];
yading@10:                         linesize= p->linesize[i];
yading@10: 
yading@10:                         for(y=0; y<v; y++){
yading@10:                             for(x=0; x<h; x++){
yading@10:                                 int pred;
yading@10: 
yading@10:                                 ptr = p->data[i] + (linesize * (v * mb_y + y)) + (h * mb_x + x); //FIXME optimize this crap
yading@10:                                 PREDICT(pred, ptr[-linesize-1], ptr[-linesize], ptr[-1], predictor);
yading@10: 
yading@10:                                 if(i==0)
yading@10:                                     ff_mjpeg_encode_dc(s, *ptr - pred, m->huff_size_dc_luminance, m->huff_code_dc_luminance); //FIXME ugly
yading@10:                                 else
yading@10:                                     ff_mjpeg_encode_dc(s, *ptr - pred, m->huff_size_dc_chrominance, m->huff_code_dc_chrominance);
yading@10:                             }
yading@10:                         }
yading@10:                     }
yading@10:                 }
yading@10:             }
yading@10:         }
yading@10:     }
yading@10: 
yading@10:     emms_c();
yading@10:     av_assert0(s->esc_pos == s->header_bits >> 3);
yading@10:     ff_mjpeg_encode_stuffing(s);
yading@10:     ff_mjpeg_encode_picture_trailer(s);
yading@10:     s->picture_number++;
yading@10: 
yading@10:     flush_put_bits(&s->pb);
yading@10:     pkt->size   = put_bits_ptr(&s->pb) - s->pb.buf;
yading@10:     pkt->flags |= AV_PKT_FLAG_KEY;
yading@10:     *got_packet = 1;
yading@10: 
yading@10:     return 0;
yading@10: //    return (put_bits_count(&f->pb)+7)/8;
yading@10: }
yading@10: 
yading@10: 
yading@10: AVCodec ff_ljpeg_encoder = { //FIXME avoid MPV_* lossless JPEG should not need them
yading@10:     .name           = "ljpeg",
yading@10:     .type           = AVMEDIA_TYPE_VIDEO,
yading@10:     .id             = AV_CODEC_ID_LJPEG,
yading@10:     .priv_data_size = sizeof(MpegEncContext),
yading@10:     .init           = ff_MPV_encode_init,
yading@10:     .encode2        = encode_picture_lossless,
yading@10:     .close          = ff_MPV_encode_end,
yading@10:     .pix_fmts       = (const enum AVPixelFormat[]){
yading@10:         AV_PIX_FMT_BGR24, AV_PIX_FMT_BGRA, AV_PIX_FMT_BGR0,
yading@10:         AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ422P,
yading@10:         AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUV422P,
yading@10:         AV_PIX_FMT_NONE},
yading@10:     .long_name      = NULL_IF_CONFIG_SMALL("Lossless JPEG"),
yading@10: };