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