Use libopenjpeg for jpeg2k decoding.

Patch by Jaikrishnan Menon

Originally committed as revision 17017 to svn://svn.ffmpeg.org/ffmpeg/trunk

1 files changed, 190 insertions, 0 deletions

diff --git a/libavcodec/libopenjpeg.c b/libavcodec/libopenjpeg.c
new file mode 100644
index 0000000000..f231ea3336
--- /dev/null
+++ b/libavcodec/libopenjpeg.c
@@ -0,0 +1,190 @@
+/*
+ * JPEG 2000 decoding support via OpenJPEG
+ * Copyright (c) 2009 Jaikrishnan Menon <realityman@gmx.net>
+ *
+ * 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 <libopenjpeg/openjpeg.h>
+
+#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,
+                                    const uint8_t *buf, int buf_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);
+
+    // 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;
+    height = image->comps[0].h;
+    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 < height; y++) {
+        index = y*width;
+        img_ptr = picture->data[0] + y*picture->linesize[0];
+        for(x = 0; x < 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"),
+} ;