Patch by Jaikrishnan Menon Originally committed as revision 17017 to svn://svn.ffmpeg.org/ffmpeg/trunkpull/126/head
Jai Menon
16 years ago
committed by
Carl Eugen Hoyos
parent
302879cb36
commit
9a77d59a89
8 changed files with 203 additions and 1 deletions
@ -0,0 +1,190 @@ |
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/*
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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 libavcodec/libopenjpeg.c |
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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 <libopenjpeg/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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const uint8_t *buf, int buf_size) |
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{ |
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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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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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// 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; |
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height = image->comps[0].h; |
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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_RGB32; |
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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 < height; y++) { |
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index = y*width; |
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img_ptr = picture->data[0] + y*picture->linesize[0]; |
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for(x = 0; x < 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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CODEC_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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NULL, |
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.long_name = NULL_IF_CONFIG_SMALL("OpenJPEG based JPEG 2000 decoder"), |
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} ; |
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