198 lines
6.1 KiB
C
198 lines
6.1 KiB
C
/*
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* JPEG 2000 decoding support via OpenJPEG
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* Copyright (c) 2009 Jaikrishnan Menon <realityman@gmx.net>
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg 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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* FFmpeg 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 FFmpeg; 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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* JPEG 2000 decoder using libopenjpeg
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*/
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#include "avcodec.h"
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#include "libavutil/intreadwrite.h"
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#define OPJ_STATIC
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#include <openjpeg.h>
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#define JP2_SIG_TYPE 0x6A502020
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#define JP2_SIG_VALUE 0x0D0A870A
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typedef struct {
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opj_dparameters_t dec_params;
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AVFrame image;
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} LibOpenJPEGContext;
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static int check_image_attributes(opj_image_t *image)
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{
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return image->comps[0].dx == image->comps[1].dx &&
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image->comps[1].dx == image->comps[2].dx &&
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image->comps[0].dy == image->comps[1].dy &&
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image->comps[1].dy == image->comps[2].dy &&
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image->comps[0].prec == image->comps[1].prec &&
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image->comps[1].prec == image->comps[2].prec;
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}
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static av_cold int libopenjpeg_decode_init(AVCodecContext *avctx)
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{
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LibOpenJPEGContext *ctx = avctx->priv_data;
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opj_set_default_decoder_parameters(&ctx->dec_params);
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avctx->coded_frame = &ctx->image;
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return 0;
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}
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static int libopenjpeg_decode_frame(AVCodecContext *avctx,
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void *data, int *data_size,
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AVPacket *avpkt)
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{
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const uint8_t *buf = avpkt->data;
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int buf_size = avpkt->size;
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LibOpenJPEGContext *ctx = avctx->priv_data;
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AVFrame *picture = &ctx->image, *output = data;
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opj_dinfo_t *dec;
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opj_cio_t *stream;
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opj_image_t *image;
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int width, height, has_alpha = 0, ret = -1;
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int x, y, index;
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uint8_t *img_ptr;
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int adjust[4];
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*data_size = 0;
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// Check if input is a raw jpeg2k codestream or in jp2 wrapping
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if((AV_RB32(buf) == 12) &&
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(AV_RB32(buf + 4) == JP2_SIG_TYPE) &&
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(AV_RB32(buf + 8) == JP2_SIG_VALUE)) {
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dec = opj_create_decompress(CODEC_JP2);
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} else {
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// If the AVPacket contains a jp2c box, then skip to
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// the starting byte of the codestream.
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if (AV_RB32(buf + 4) == AV_RB32("jp2c"))
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buf += 8;
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dec = opj_create_decompress(CODEC_J2K);
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}
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if(!dec) {
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av_log(avctx, AV_LOG_ERROR, "Error initializing decoder.\n");
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return -1;
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}
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opj_set_event_mgr((opj_common_ptr)dec, NULL, NULL);
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ctx->dec_params.cp_reduce = avctx->lowres;
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// Tie decoder with decoding parameters
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opj_setup_decoder(dec, &ctx->dec_params);
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stream = opj_cio_open((opj_common_ptr)dec, buf, buf_size);
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if(!stream) {
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av_log(avctx, AV_LOG_ERROR, "Codestream could not be opened for reading.\n");
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opj_destroy_decompress(dec);
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return -1;
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}
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// Decode the codestream
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image = opj_decode_with_info(dec, stream, NULL);
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opj_cio_close(stream);
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if(!image) {
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av_log(avctx, AV_LOG_ERROR, "Error decoding codestream.\n");
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opj_destroy_decompress(dec);
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return -1;
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}
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width = image->comps[0].w << avctx->lowres;
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height = image->comps[0].h << avctx->lowres;
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if(avcodec_check_dimensions(avctx, width, height) < 0) {
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av_log(avctx, AV_LOG_ERROR, "%dx%d dimension invalid.\n", width, height);
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goto done;
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}
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avcodec_set_dimensions(avctx, width, height);
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switch(image->numcomps)
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{
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case 1: avctx->pix_fmt = PIX_FMT_GRAY8;
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break;
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case 3: if(check_image_attributes(image)) {
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avctx->pix_fmt = PIX_FMT_RGB24;
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} else {
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avctx->pix_fmt = PIX_FMT_GRAY8;
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av_log(avctx, AV_LOG_ERROR, "Only first component will be used.\n");
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}
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break;
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case 4: has_alpha = 1;
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avctx->pix_fmt = PIX_FMT_RGBA;
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break;
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default: av_log(avctx, AV_LOG_ERROR, "%d components unsupported.\n", image->numcomps);
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goto done;
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}
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if(picture->data[0])
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avctx->release_buffer(avctx, picture);
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if(avctx->get_buffer(avctx, picture) < 0) {
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av_log(avctx, AV_LOG_ERROR, "Couldn't allocate image buffer.\n");
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return -1;
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}
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for(x = 0; x < image->numcomps; x++) {
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adjust[x] = FFMAX(image->comps[x].prec - 8, 0);
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}
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for(y = 0; y < avctx->height; y++) {
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index = y*avctx->width;
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img_ptr = picture->data[0] + y*picture->linesize[0];
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for(x = 0; x < avctx->width; x++, index++) {
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*img_ptr++ = image->comps[0].data[index] >> adjust[0];
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if(image->numcomps > 2 && check_image_attributes(image)) {
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*img_ptr++ = image->comps[1].data[index] >> adjust[1];
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*img_ptr++ = image->comps[2].data[index] >> adjust[2];
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if(has_alpha)
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*img_ptr++ = image->comps[3].data[index] >> adjust[3];
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}
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}
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}
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*output = ctx->image;
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*data_size = sizeof(AVPicture);
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ret = buf_size;
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done:
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opj_image_destroy(image);
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opj_destroy_decompress(dec);
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return ret;
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}
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static av_cold int libopenjpeg_decode_close(AVCodecContext *avctx)
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{
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LibOpenJPEGContext *ctx = avctx->priv_data;
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if(ctx->image.data[0])
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avctx->release_buffer(avctx, &ctx->image);
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return 0 ;
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}
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AVCodec libopenjpeg_decoder = {
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"libopenjpeg",
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AVMEDIA_TYPE_VIDEO,
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CODEC_ID_JPEG2000,
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sizeof(LibOpenJPEGContext),
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libopenjpeg_decode_init,
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NULL,
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libopenjpeg_decode_close,
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libopenjpeg_decode_frame,
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CODEC_CAP_DR1,
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.long_name = NULL_IF_CONFIG_SMALL("OpenJPEG based JPEG 2000 decoder"),
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} ;
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