static int libopenjpeg_decode_frame(AVCodecContext *avctx, void *data, int *data_size, AVPacket *avpkt) { uint8_t *buf = avpkt->data; int buf_size = avpkt->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, ret = -1; int pixel_size = 0; int ispacked = 0; *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 { // If the AVPacket contains a jp2c box, then skip to // the starting byte of the codestream. if (AV_RB32(buf + 4) == AV_RB32("jp2c")) buf += 8; dec = opj_create_decompress(CODEC_J2K); if(!dec) { av_log(avctx, AV_LOG_ERROR, "Error initializing decoder.\n"); opj_set_event_mgr((opj_common_ptr)dec, NULL, NULL); ctx->dec_params.cp_limit_decoding = LIMIT_TO_MAIN_HEADER; // 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"); // Decode the header only image = opj_decode_with_info(dec, stream, NULL); opj_cio_close(stream); width = image->x1 - image->x0; height = image->y1 - image->y0; if(av_image_check_size(width, height, 0, avctx) < 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 = (image->comps[0].bpp == 8) ? PIX_FMT_GRAY8 : PIX_FMT_GRAY16; break; case 2: avctx->pix_fmt = PIX_FMT_GRAY8A; break; case 3: case 4: avctx->pix_fmt = check_image_attributes(avctx, image); break; default: av_log(avctx, AV_LOG_ERROR, "%d components unsupported.\n", image->numcomps); goto done; if(picture->data[0]) ff_thread_release_buffer(avctx, picture); if(ff_thread_get_buffer(avctx, picture) < 0){ av_log(avctx, AV_LOG_ERROR, "ff_thread_get_buffer() failed\n"); ctx->dec_params.cp_limit_decoding = NO_LIMITATION; ctx->dec_params.cp_reduce = avctx->lowres; // 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"); // Decode the codestream image = opj_decode_with_info(dec, stream, NULL); opj_cio_close(stream); pixel_size = av_pix_fmt_descriptors[avctx->pix_fmt].comp[0].step_minus1 + 1; ispacked = libopenjpeg_ispacked(avctx->pix_fmt); switch (pixel_size) { case 1: if (ispacked) { libopenjpeg_copy_to_packed8(picture, image); } else { libopenjpeg_copyto8(picture, image); break; case 2: if (ispacked) { libopenjpeg_copy_to_packed8(picture, image); } else { libopenjpeg_copyto16(picture, image); break; case 3: case 4: if (ispacked) { libopenjpeg_copy_to_packed8(picture, image); break; case 6: case 8: if (ispacked) { libopenjpeg_copy_to_packed16(picture, image); break; default: av_log(avctx, AV_LOG_ERROR, "unsupported pixel size %d\n", pixel_size); goto done; *output = ctx->image; *data_size = sizeof(AVPicture); ret = buf_size; done: opj_image_destroy(image); return ret;