/* * JPEG 2000 decoding support via OpenJPEG * Copyright (c) 2009 Jaikrishnan Menon * * This file is part of FFmpeg. * * FFmpeg 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. * * FFmpeg 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 FFmpeg; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ /** * @file libavcodec/libopenjpeg.c * JPEG 2000 decoder using libopenjpeg */ #include "avcodec.h" #include "libavutil/intreadwrite.h" #define OPJ_STATIC #include #define JP2_SIG_TYPE 0x6A502020 #define JP2_SIG_VALUE 0x0D0A870A typedef struct { opj_dparameters_t dec_params; AVFrame image; } LibOpenJPEGContext; static int check_image_attributes(opj_image_t *image) { return(image->comps[0].dx == image->comps[1].dx && image->comps[1].dx == image->comps[2].dx && image->comps[0].dy == image->comps[1].dy && image->comps[1].dy == image->comps[2].dy && image->comps[0].prec == image->comps[1].prec && image->comps[1].prec == image->comps[2].prec); } static av_cold int libopenjpeg_decode_init(AVCodecContext *avctx) { LibOpenJPEGContext *ctx = avctx->priv_data; opj_set_default_decoder_parameters(&ctx->dec_params); avctx->coded_frame = &ctx->image; return 0; } static int libopenjpeg_decode_frame(AVCodecContext *avctx, void *data, int *data_size, AVPacket *avpkt) { const uint8_t *buf = avpkt->data; int buf_size = avpkt->size; LibOpenJPEGContext *ctx = avctx->priv_data; AVFrame *picture = &ctx->image, *output = data; opj_dinfo_t *dec; opj_cio_t *stream; opj_image_t *image; int width, height, has_alpha = 0, ret = -1; int x, y, index; uint8_t *img_ptr; int adjust[4]; *data_size = 0; // Check if input is a raw jpeg2k codestream or in jp2 wrapping if((AV_RB32(buf) == 12) && (AV_RB32(buf + 4) == JP2_SIG_TYPE) && (AV_RB32(buf + 8) == JP2_SIG_VALUE)) { dec = opj_create_decompress(CODEC_JP2); } else { dec = opj_create_decompress(CODEC_J2K); } if(!dec) { av_log(avctx, AV_LOG_ERROR, "Error initializing decoder.\n"); return -1; } opj_set_event_mgr((opj_common_ptr)dec, NULL, NULL); ctx->dec_params.cp_reduce = avctx->lowres; // Tie decoder with decoding parameters opj_setup_decoder(dec, &ctx->dec_params); stream = opj_cio_open((opj_common_ptr)dec, buf, buf_size); if(!stream) { av_log(avctx, AV_LOG_ERROR, "Codestream could not be opened for reading.\n"); opj_destroy_decompress(dec); return -1; } // Decode the codestream image = opj_decode_with_info(dec, stream, NULL); opj_cio_close(stream); if(!image) { av_log(avctx, AV_LOG_ERROR, "Error decoding codestream.\n"); opj_destroy_decompress(dec); return -1; } width = image->comps[0].w << avctx->lowres; height = image->comps[0].h << avctx->lowres; if(avcodec_check_dimensions(avctx, width, height) < 0) { av_log(avctx, AV_LOG_ERROR, "%dx%d dimension invalid.\n", width, height); goto done; } avcodec_set_dimensions(avctx, width, height); switch(image->numcomps) { case 1: avctx->pix_fmt = PIX_FMT_GRAY8; break; case 3: if(check_image_attributes(image)) { avctx->pix_fmt = PIX_FMT_RGB24; } else { avctx->pix_fmt = PIX_FMT_GRAY8; av_log(avctx, AV_LOG_ERROR, "Only first component will be used.\n"); } break; case 4: has_alpha = 1; avctx->pix_fmt = PIX_FMT_RGB32; break; default: av_log(avctx, AV_LOG_ERROR, "%d components unsupported.\n", image->numcomps); goto done; } if(picture->data[0]) avctx->release_buffer(avctx, picture); if(avctx->get_buffer(avctx, picture) < 0) { av_log(avctx, AV_LOG_ERROR, "Couldn't allocate image buffer.\n"); return -1; } for(x = 0; x < image->numcomps; x++) { adjust[x] = FFMAX(image->comps[x].prec - 8, 0); } for(y = 0; y < avctx->height; y++) { index = y*avctx->width; img_ptr = picture->data[0] + y*picture->linesize[0]; for(x = 0; x < avctx->width; x++, index++) { *img_ptr++ = image->comps[0].data[index] >> adjust[0]; if(image->numcomps > 2 && check_image_attributes(image)) { *img_ptr++ = image->comps[1].data[index] >> adjust[1]; *img_ptr++ = image->comps[2].data[index] >> adjust[2]; if(has_alpha) *img_ptr++ = image->comps[3].data[index] >> adjust[3]; } } } *output = ctx->image; *data_size = sizeof(AVPicture); ret = buf_size; done: opj_image_destroy(image); opj_destroy_decompress(dec); return ret; } static av_cold int libopenjpeg_decode_close(AVCodecContext *avctx) { LibOpenJPEGContext *ctx = avctx->priv_data; if(ctx->image.data[0]) avctx->release_buffer(avctx, &ctx->image); return 0 ; } AVCodec libopenjpeg_decoder = { "libopenjpeg", CODEC_TYPE_VIDEO, CODEC_ID_JPEG2000, sizeof(LibOpenJPEGContext), libopenjpeg_decode_init, NULL, libopenjpeg_decode_close, libopenjpeg_decode_frame, NULL, .long_name = NULL_IF_CONFIG_SMALL("OpenJPEG based JPEG 2000 decoder"), } ;