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00027 #include "libavutil/imgutils.h"
00028 #include "avcodec.h"
00029 #include "libavutil/intreadwrite.h"
00030 #define OPJ_STATIC
00031 #include <openjpeg.h>
00032
00033 #define JP2_SIG_TYPE 0x6A502020
00034 #define JP2_SIG_VALUE 0x0D0A870A
00035
00036 typedef struct {
00037 opj_dparameters_t dec_params;
00038 AVFrame image;
00039 } LibOpenJPEGContext;
00040
00041 static int check_image_attributes(opj_image_t *image)
00042 {
00043 return image->comps[0].dx == image->comps[1].dx &&
00044 image->comps[1].dx == image->comps[2].dx &&
00045 image->comps[0].dy == image->comps[1].dy &&
00046 image->comps[1].dy == image->comps[2].dy &&
00047 image->comps[0].prec == image->comps[1].prec &&
00048 image->comps[1].prec == image->comps[2].prec;
00049 }
00050
00051 static av_cold int libopenjpeg_decode_init(AVCodecContext *avctx)
00052 {
00053 LibOpenJPEGContext *ctx = avctx->priv_data;
00054
00055 opj_set_default_decoder_parameters(&ctx->dec_params);
00056 avctx->coded_frame = &ctx->image;
00057 return 0;
00058 }
00059
00060 static int libopenjpeg_decode_frame(AVCodecContext *avctx,
00061 void *data, int *data_size,
00062 AVPacket *avpkt)
00063 {
00064 const uint8_t *buf = avpkt->data;
00065 int buf_size = avpkt->size;
00066 LibOpenJPEGContext *ctx = avctx->priv_data;
00067 AVFrame *picture = &ctx->image, *output = data;
00068 opj_dinfo_t *dec;
00069 opj_cio_t *stream;
00070 opj_image_t *image;
00071 int width, height, has_alpha = 0, ret = -1;
00072 int x, y, index;
00073 uint8_t *img_ptr;
00074 int adjust[4];
00075
00076 *data_size = 0;
00077
00078
00079 if((AV_RB32(buf) == 12) &&
00080 (AV_RB32(buf + 4) == JP2_SIG_TYPE) &&
00081 (AV_RB32(buf + 8) == JP2_SIG_VALUE)) {
00082 dec = opj_create_decompress(CODEC_JP2);
00083 } else {
00084
00085
00086 if (AV_RB32(buf + 4) == AV_RB32("jp2c"))
00087 buf += 8;
00088 dec = opj_create_decompress(CODEC_J2K);
00089 }
00090
00091 if(!dec) {
00092 av_log(avctx, AV_LOG_ERROR, "Error initializing decoder.\n");
00093 return -1;
00094 }
00095 opj_set_event_mgr((opj_common_ptr)dec, NULL, NULL);
00096
00097 ctx->dec_params.cp_reduce = avctx->lowres;
00098
00099 opj_setup_decoder(dec, &ctx->dec_params);
00100 stream = opj_cio_open((opj_common_ptr)dec, buf, buf_size);
00101 if(!stream) {
00102 av_log(avctx, AV_LOG_ERROR, "Codestream could not be opened for reading.\n");
00103 opj_destroy_decompress(dec);
00104 return -1;
00105 }
00106
00107
00108 image = opj_decode_with_info(dec, stream, NULL);
00109 opj_cio_close(stream);
00110 if(!image) {
00111 av_log(avctx, AV_LOG_ERROR, "Error decoding codestream.\n");
00112 opj_destroy_decompress(dec);
00113 return -1;
00114 }
00115 width = image->comps[0].w << avctx->lowres;
00116 height = image->comps[0].h << avctx->lowres;
00117 if(av_image_check_size(width, height, 0, avctx) < 0) {
00118 av_log(avctx, AV_LOG_ERROR, "%dx%d dimension invalid.\n", width, height);
00119 goto done;
00120 }
00121 avcodec_set_dimensions(avctx, width, height);
00122
00123 switch(image->numcomps)
00124 {
00125 case 1: avctx->pix_fmt = PIX_FMT_GRAY8;
00126 break;
00127 case 3: if(check_image_attributes(image)) {
00128 avctx->pix_fmt = PIX_FMT_RGB24;
00129 } else {
00130 avctx->pix_fmt = PIX_FMT_GRAY8;
00131 av_log(avctx, AV_LOG_ERROR, "Only first component will be used.\n");
00132 }
00133 break;
00134 case 4: has_alpha = 1;
00135 avctx->pix_fmt = PIX_FMT_RGBA;
00136 break;
00137 default: av_log(avctx, AV_LOG_ERROR, "%d components unsupported.\n", image->numcomps);
00138 goto done;
00139 }
00140
00141 if(picture->data[0])
00142 avctx->release_buffer(avctx, picture);
00143
00144 if(avctx->get_buffer(avctx, picture) < 0) {
00145 av_log(avctx, AV_LOG_ERROR, "Couldn't allocate image buffer.\n");
00146 return -1;
00147 }
00148
00149 for(x = 0; x < image->numcomps; x++) {
00150 adjust[x] = FFMAX(image->comps[x].prec - 8, 0);
00151 }
00152
00153 for(y = 0; y < avctx->height; y++) {
00154 index = y*avctx->width;
00155 img_ptr = picture->data[0] + y*picture->linesize[0];
00156 for(x = 0; x < avctx->width; x++, index++) {
00157 *img_ptr++ = image->comps[0].data[index] >> adjust[0];
00158 if(image->numcomps > 2 && check_image_attributes(image)) {
00159 *img_ptr++ = image->comps[1].data[index] >> adjust[1];
00160 *img_ptr++ = image->comps[2].data[index] >> adjust[2];
00161 if(has_alpha)
00162 *img_ptr++ = image->comps[3].data[index] >> adjust[3];
00163 }
00164 }
00165 }
00166
00167 *output = ctx->image;
00168 *data_size = sizeof(AVPicture);
00169 ret = buf_size;
00170
00171 done:
00172 opj_image_destroy(image);
00173 opj_destroy_decompress(dec);
00174 return ret;
00175 }
00176
00177 static av_cold int libopenjpeg_decode_close(AVCodecContext *avctx)
00178 {
00179 LibOpenJPEGContext *ctx = avctx->priv_data;
00180
00181 if(ctx->image.data[0])
00182 avctx->release_buffer(avctx, &ctx->image);
00183 return 0 ;
00184 }
00185
00186
00187 AVCodec ff_libopenjpeg_decoder = {
00188 "libopenjpeg",
00189 AVMEDIA_TYPE_VIDEO,
00190 CODEC_ID_JPEG2000,
00191 sizeof(LibOpenJPEGContext),
00192 libopenjpeg_decode_init,
00193 NULL,
00194 libopenjpeg_decode_close,
00195 libopenjpeg_decode_frame,
00196 CODEC_CAP_DR1,
00197 .max_lowres = 5,
00198 .long_name = NULL_IF_CONFIG_SMALL("OpenJPEG based JPEG 2000 decoder"),
00199 } ;