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00027 #include "libavutil/imgutils.h"
00028 #include "avcodec.h"
00029 #include "libavutil/intreadwrite.h"
00030 #include "thread.h"
00031 #define OPJ_STATIC
00032 #include <openjpeg.h>
00033
00034 #define JP2_SIG_TYPE 0x6A502020
00035 #define JP2_SIG_VALUE 0x0D0A870A
00036
00037 typedef struct {
00038 opj_dparameters_t dec_params;
00039 AVFrame image;
00040 } LibOpenJPEGContext;
00041
00042 static int check_image_attributes(opj_image_t *image)
00043 {
00044 return image->comps[0].dx == image->comps[1].dx &&
00045 image->comps[1].dx == image->comps[2].dx &&
00046 image->comps[0].dy == image->comps[1].dy &&
00047 image->comps[1].dy == image->comps[2].dy &&
00048 image->comps[0].prec == image->comps[1].prec &&
00049 image->comps[1].prec == image->comps[2].prec;
00050 }
00051
00052 static av_cold int libopenjpeg_decode_init(AVCodecContext *avctx)
00053 {
00054 LibOpenJPEGContext *ctx = avctx->priv_data;
00055
00056 opj_set_default_decoder_parameters(&ctx->dec_params);
00057 avctx->coded_frame = &ctx->image;
00058 return 0;
00059 }
00060
00061 static av_cold int libopenjpeg_decode_init_thread_copy(AVCodecContext *avctx)
00062 {
00063 LibOpenJPEGContext *ctx = avctx->priv_data;
00064
00065 avctx->coded_frame = &ctx->image;
00066 return 0;
00067 }
00068
00069 static int libopenjpeg_decode_frame(AVCodecContext *avctx,
00070 void *data, int *data_size,
00071 AVPacket *avpkt)
00072 {
00073 uint8_t *buf = avpkt->data;
00074 int buf_size = avpkt->size;
00075 LibOpenJPEGContext *ctx = avctx->priv_data;
00076 AVFrame *picture = &ctx->image, *output = data;
00077 opj_dinfo_t *dec;
00078 opj_cio_t *stream;
00079 opj_image_t *image;
00080 int width, height, has_alpha = 0, ret = -1;
00081 int x, y, index;
00082 uint8_t *img_ptr;
00083 int adjust[4];
00084
00085 *data_size = 0;
00086
00087
00088 if((AV_RB32(buf) == 12) &&
00089 (AV_RB32(buf + 4) == JP2_SIG_TYPE) &&
00090 (AV_RB32(buf + 8) == JP2_SIG_VALUE)) {
00091 dec = opj_create_decompress(CODEC_JP2);
00092 } else {
00093
00094
00095 if (AV_RB32(buf + 4) == AV_RB32("jp2c"))
00096 buf += 8;
00097 dec = opj_create_decompress(CODEC_J2K);
00098 }
00099
00100 if(!dec) {
00101 av_log(avctx, AV_LOG_ERROR, "Error initializing decoder.\n");
00102 return -1;
00103 }
00104 opj_set_event_mgr((opj_common_ptr)dec, NULL, NULL);
00105
00106 ctx->dec_params.cp_limit_decoding = LIMIT_TO_MAIN_HEADER;
00107
00108 opj_setup_decoder(dec, &ctx->dec_params);
00109 stream = opj_cio_open((opj_common_ptr)dec, buf, buf_size);
00110 if(!stream) {
00111 av_log(avctx, AV_LOG_ERROR, "Codestream could not be opened for reading.\n");
00112 opj_destroy_decompress(dec);
00113 return -1;
00114 }
00115
00116
00117 image = opj_decode_with_info(dec, stream, NULL);
00118 opj_cio_close(stream);
00119 if(!image) {
00120 av_log(avctx, AV_LOG_ERROR, "Error decoding codestream.\n");
00121 opj_destroy_decompress(dec);
00122 return -1;
00123 }
00124 width = image->x1 - image->x0;
00125 height = image->y1 - image->y0;
00126 if(av_image_check_size(width, height, 0, avctx) < 0) {
00127 av_log(avctx, AV_LOG_ERROR, "%dx%d dimension invalid.\n", width, height);
00128 goto done;
00129 }
00130 avcodec_set_dimensions(avctx, width, height);
00131
00132 switch(image->numcomps)
00133 {
00134 case 1: avctx->pix_fmt = PIX_FMT_GRAY8;
00135 break;
00136 case 3: if(check_image_attributes(image)) {
00137 avctx->pix_fmt = PIX_FMT_RGB24;
00138 } else {
00139 avctx->pix_fmt = PIX_FMT_GRAY8;
00140 av_log(avctx, AV_LOG_ERROR, "Only first component will be used.\n");
00141 }
00142 break;
00143 case 4: has_alpha = 1;
00144 avctx->pix_fmt = PIX_FMT_RGBA;
00145 break;
00146 default: av_log(avctx, AV_LOG_ERROR, "%d components unsupported.\n", image->numcomps);
00147 goto done;
00148 }
00149
00150 if(picture->data[0])
00151 ff_thread_release_buffer(avctx, picture);
00152
00153 if(ff_thread_get_buffer(avctx, picture) < 0){
00154 av_log(avctx, AV_LOG_ERROR, "ff_thread_get_buffer() failed\n");
00155 return -1;
00156 }
00157
00158 ff_thread_finish_setup(avctx);
00159
00160 ctx->dec_params.cp_limit_decoding = NO_LIMITATION;
00161 ctx->dec_params.cp_reduce = avctx->lowres;
00162
00163 opj_setup_decoder(dec, &ctx->dec_params);
00164 stream = opj_cio_open((opj_common_ptr)dec, buf, buf_size);
00165 if(!stream) {
00166 av_log(avctx, AV_LOG_ERROR, "Codestream could not be opened for reading.\n");
00167 opj_destroy_decompress(dec);
00168 return -1;
00169 }
00170
00171
00172 image = opj_decode_with_info(dec, stream, NULL);
00173 opj_cio_close(stream);
00174
00175 for(x = 0; x < image->numcomps; x++) {
00176 adjust[x] = FFMAX(image->comps[x].prec - 8, 0);
00177 }
00178
00179 for(y = 0; y < avctx->height; y++) {
00180 index = y*avctx->width;
00181 img_ptr = picture->data[0] + y*picture->linesize[0];
00182 for(x = 0; x < avctx->width; x++, index++) {
00183 *img_ptr++ = image->comps[0].data[index] >> adjust[0];
00184 if(image->numcomps > 2 && check_image_attributes(image)) {
00185 *img_ptr++ = image->comps[1].data[index] >> adjust[1];
00186 *img_ptr++ = image->comps[2].data[index] >> adjust[2];
00187 if(has_alpha)
00188 *img_ptr++ = image->comps[3].data[index] >> adjust[3];
00189 }
00190 }
00191 }
00192
00193 *output = ctx->image;
00194 *data_size = sizeof(AVPicture);
00195 ret = buf_size;
00196
00197 done:
00198 opj_image_destroy(image);
00199 opj_destroy_decompress(dec);
00200 return ret;
00201 }
00202
00203 static av_cold int libopenjpeg_decode_close(AVCodecContext *avctx)
00204 {
00205 LibOpenJPEGContext *ctx = avctx->priv_data;
00206
00207 if(ctx->image.data[0])
00208 ff_thread_release_buffer(avctx, &ctx->image);
00209 return 0 ;
00210 }
00211
00212
00213 AVCodec ff_libopenjpeg_decoder = {
00214 .name = "libopenjpeg",
00215 .type = AVMEDIA_TYPE_VIDEO,
00216 .id = CODEC_ID_JPEG2000,
00217 .priv_data_size = sizeof(LibOpenJPEGContext),
00218 .init = libopenjpeg_decode_init,
00219 .close = libopenjpeg_decode_close,
00220 .decode = libopenjpeg_decode_frame,
00221 .capabilities = CODEC_CAP_DR1 | CODEC_CAP_FRAME_THREADS,
00222 .max_lowres = 5,
00223 .long_name = NULL_IF_CONFIG_SMALL("OpenJPEG based JPEG 2000 decoder"),
00224 .init_thread_copy = ONLY_IF_THREADS_ENABLED(libopenjpeg_decode_init_thread_copy)
00225 };