static int decode_init(AVCodecContext *avctx) { LclContext * const c = (LclContext *)avctx->priv_data; int basesize = avctx->width * avctx->height; int zret; // Zlib return code c->avctx = avctx; avctx->has_b_frames = 0; c->pic.data[0] = NULL; #ifdef CONFIG_ZLIB // Needed if zlib unused or init aborted before inflateInit memset(&(c->zstream), 0, sizeof(z_stream)); #endif if (avctx->extradata_size < 8) { av_log(avctx, AV_LOG_ERROR, "Extradata size too small.\n"); return 1; } /* Check codec type */ if (((avctx->codec_id == CODEC_ID_MSZH) && (*((char *)avctx->extradata + 7) != CODEC_MSZH)) || ((avctx->codec_id == CODEC_ID_ZLIB) && (*((char *)avctx->extradata + 7) != CODEC_ZLIB))) { av_log(avctx, AV_LOG_ERROR, "Codec id and codec type mismatch. This should not happen.\n"); } /* Detect image type */ switch (c->imgtype = *((char *)avctx->extradata + 4)) { case IMGTYPE_YUV111: c->decomp_size = basesize * 3; av_log(avctx, AV_LOG_INFO, "Image type is YUV 1:1:1.\n"); break; case IMGTYPE_YUV422: c->decomp_size = basesize * 2; av_log(avctx, AV_LOG_INFO, "Image type is YUV 4:2:2.\n"); break; case IMGTYPE_RGB24: c->decomp_size = basesize * 3; av_log(avctx, AV_LOG_INFO, "Image type is RGB 24.\n"); break; case IMGTYPE_YUV411: c->decomp_size = basesize / 2 * 3; av_log(avctx, AV_LOG_INFO, "Image type is YUV 4:1:1.\n"); break; case IMGTYPE_YUV211: c->decomp_size = basesize * 2; av_log(avctx, AV_LOG_INFO, "Image type is YUV 2:1:1.\n"); break; case IMGTYPE_YUV420: c->decomp_size = basesize / 2 * 3; av_log(avctx, AV_LOG_INFO, "Image type is YUV 4:2:0.\n"); break; default: av_log(avctx, AV_LOG_ERROR, "Unsupported image format %d.\n", c->imgtype); return 1; } /* Detect compression method */ c->compression = *((char *)avctx->extradata + 5); switch (avctx->codec_id) { case CODEC_ID_MSZH: switch (c->compression) { case COMP_MSZH: av_log(avctx, AV_LOG_INFO, "Compression enabled.\n"); break; case COMP_MSZH_NOCOMP: c->decomp_size = 0; av_log(avctx, AV_LOG_INFO, "No compression.\n"); break; default: av_log(avctx, AV_LOG_ERROR, "Unsupported compression format for MSZH (%d).\n", c->compression); return 1; } break; case CODEC_ID_ZLIB: #ifdef CONFIG_ZLIB switch (c->compression) { case COMP_ZLIB_HISPEED: av_log(avctx, AV_LOG_INFO, "High speed compression.\n"); break; case COMP_ZLIB_HICOMP: av_log(avctx, AV_LOG_INFO, "High compression.\n"); break; case COMP_ZLIB_NORMAL: av_log(avctx, AV_LOG_INFO, "Normal compression.\n"); break; default: if ((c->compression < Z_NO_COMPRESSION) || (c->compression > Z_BEST_COMPRESSION)) { av_log(avctx, AV_LOG_ERROR, "Unusupported compression level for ZLIB: (%d).\n", c->compression); return 1; } av_log(avctx, AV_LOG_INFO, "Compression level for ZLIB: (%d).\n", c->compression); } #else av_log(avctx, AV_LOG_ERROR, "Zlib support not compiled.\n"); return 1; #endif break; default: av_log(avctx, AV_LOG_ERROR, "BUG! Unknown codec in compression switch.\n"); return 1; } /* Allocate decompression buffer */ /* 4*8 max overflow space for mszh decomp algorithm */ if (c->decomp_size) { if ((c->decomp_buf = av_malloc(c->decomp_size+4*8)) == NULL) { av_log(avctx, AV_LOG_ERROR, "Can't allocate decompression buffer.\n"); return 1; } } /* Detect flags */ c->flags = *((char *)avctx->extradata + 6); if (c->flags & FLAG_MULTITHREAD) av_log(avctx, AV_LOG_INFO, "Multithread encoder flag set.\n"); if (c->flags & FLAG_NULLFRAME) av_log(avctx, AV_LOG_INFO, "Nullframe insertion flag set.\n"); if ((avctx->codec_id == CODEC_ID_ZLIB) && (c->flags & FLAG_PNGFILTER)) av_log(avctx, AV_LOG_INFO, "PNG filter flag set.\n"); if (c->flags & FLAGMASK_UNUSED) av_log(avctx, AV_LOG_ERROR, "Unknown flag set (%d).\n", c->flags); /* If needed init zlib */ if (avctx->codec_id == CODEC_ID_ZLIB) { #ifdef CONFIG_ZLIB c->zstream.zalloc = Z_NULL; c->zstream.zfree = Z_NULL; c->zstream.opaque = Z_NULL; zret = inflateInit(&(c->zstream)); if (zret != Z_OK) { av_log(avctx, AV_LOG_ERROR, "Inflate init error: %d\n", zret); return 1; } #else av_log(avctx, AV_LOG_ERROR, "Zlib support not compiled.\n"); return 1; #endif } avctx->pix_fmt = PIX_FMT_BGR24; return 0; }
static int decode_init(AVCodecContext *avctx) { LclContext * const c = (LclContext *)avctx->priv_data; int basesize = avctx->width * avctx->height; int zret;  