/* * LCL (LossLess Codec Library) Codec * Copyright (c) 2002-2004 Roberto Togni * * This file is part of Libav. * * Libav 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. * * Libav 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 Libav; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ /** * @file * LCL (LossLess Codec Library) Video Codec * Decoder for MSZH and ZLIB codecs * Experimental encoder for ZLIB RGB24 * * Fourcc: MSZH, ZLIB * * Original Win32 dll: * Ver2.23 By Kenji Oshima 2000.09.20 * avimszh.dll, avizlib.dll * * A description of the decoding algorithm can be found here: * http://www.pcisys.net/~melanson/codecs * * Supports: BGR24 (RGB 24bpp) * */ #include <stdio.h> #include <stdlib.h> #include "avcodec.h" #include "bytestream.h" #include "lcl.h" #include "libavutil/lzo.h" #if CONFIG_ZLIB_DECODER #include <zlib.h> #endif /* * Decoder context */ typedef struct LclDecContext { AVFrame pic; // Image type int imgtype; // Compression type int compression; // Flags int flags; // Decompressed data size unsigned int decomp_size; // Decompression buffer unsigned char* decomp_buf; #if CONFIG_ZLIB_DECODER z_stream zstream; #endif } LclDecContext; /** * @param srcptr compressed source buffer, must be padded with at least 5 extra bytes * @param destptr must be padded sufficiently for av_memcpy_backptr */ static unsigned int mszh_decomp(const unsigned char * srcptr, int srclen, unsigned char * destptr, unsigned int destsize) { unsigned char *destptr_bak = destptr; unsigned char *destptr_end = destptr + destsize; const unsigned char *srcptr_end = srcptr + srclen; unsigned mask = *srcptr++; unsigned maskbit = 0x80; while (srcptr < srcptr_end && destptr < destptr_end) { if (!(mask & maskbit)) { memcpy(destptr, srcptr, 4); destptr += 4; srcptr += 4; } else { unsigned ofs = bytestream_get_le16(&srcptr); unsigned cnt = (ofs >> 11) + 1; ofs &= 0x7ff; ofs = FFMIN(ofs, destptr - destptr_bak); cnt *= 4; cnt = FFMIN(cnt, destptr_end - destptr); av_memcpy_backptr(destptr, ofs, cnt); destptr += cnt; } maskbit >>= 1; if (!maskbit) { mask = *srcptr++; while (!mask) { if (destptr_end - destptr < 32 || srcptr_end - srcptr < 32) break; memcpy(destptr, srcptr, 32); destptr += 32; srcptr += 32; mask = *srcptr++; } maskbit = 0x80; } } return destptr - destptr_bak; } #if CONFIG_ZLIB_DECODER /** * @brief decompress a zlib-compressed data block into decomp_buf * @param src compressed input buffer * @param src_len data length in input buffer * @param offset offset in decomp_buf * @param expected expected decompressed length */ static int zlib_decomp(AVCodecContext *avctx, const uint8_t *src, int src_len, int offset, int expected) { LclDecContext *c = avctx->priv_data; int zret = inflateReset(&c->zstream); if (zret != Z_OK) { av_log(avctx, AV_LOG_ERROR, "Inflate reset error: %d\n", zret); return -1; } c->zstream.next_in = src; c->zstream.avail_in = src_len; c->zstream.next_out = c->decomp_buf + offset; c->zstream.avail_out = c->decomp_size - offset; zret = inflate(&c->zstream, Z_FINISH); if (zret != Z_OK && zret != Z_STREAM_END) { av_log(avctx, AV_LOG_ERROR, "Inflate error: %d\n", zret); return -1; } if (expected != (unsigned int)c->zstream.total_out) { av_log(avctx, AV_LOG_ERROR, "Decoded size differs (%d != %lu)\n", expected, c->zstream.total_out); return -1; } return c->zstream.total_out; } #endif /* * * Decode a frame * */ static int decode_frame(AVCodecContext *avctx, void *data, int *data_size, AVPacket *avpkt) { const uint8_t *buf = avpkt->data; int buf_size = avpkt->size; LclDecContext * const c = avctx->priv_data; unsigned char *encoded = (unsigned char *)buf; unsigned int pixel_ptr; int row, col; unsigned char *outptr; uint8_t *y_out, *u_out, *v_out; unsigned int width = avctx->width; // Real image width unsigned int height = avctx->height; // Real image height unsigned int mszh_dlen; unsigned char yq, y1q, uq, vq; int uqvq; unsigned int mthread_inlen, mthread_outlen; unsigned int len = buf_size; if(c->pic.data[0]) avctx->release_buffer(avctx, &c->pic); c->pic.reference = 0; c->pic.buffer_hints = FF_BUFFER_HINTS_VALID; if(avctx->get_buffer(avctx, &c->pic) < 0){ av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n"); return -1; } outptr = c->pic.data[0]; // Output image pointer /* Decompress frame */ switch (avctx->codec_id) { case CODEC_ID_MSZH: switch (c->compression) { case COMP_MSZH: if (c->flags & FLAG_MULTITHREAD) { mthread_inlen = AV_RL32(encoded); mthread_inlen = FFMIN(mthread_inlen, len - 8); mthread_outlen = AV_RL32(encoded+4); mthread_outlen = FFMIN(mthread_outlen, c->decomp_size); mszh_dlen = mszh_decomp(encoded + 8, mthread_inlen, c->decomp_buf, c->decomp_size); if (mthread_outlen != mszh_dlen) { av_log(avctx, AV_LOG_ERROR, "Mthread1 decoded size differs (%d != %d)\n", mthread_outlen, mszh_dlen); return -1; } mszh_dlen = mszh_decomp(encoded + 8 + mthread_inlen, len - 8 - mthread_inlen, c->decomp_buf + mthread_outlen, c->decomp_size - mthread_outlen); if (mthread_outlen != mszh_dlen) { av_log(avctx, AV_LOG_ERROR, "Mthread2 decoded size differs (%d != %d)\n", mthread_outlen, mszh_dlen); return -1; } encoded = c->decomp_buf; len = c->decomp_size; } else { mszh_dlen = mszh_decomp(encoded, len, c->decomp_buf, c->decomp_size); if (c->decomp_size != mszh_dlen) { av_log(avctx, AV_LOG_ERROR, "Decoded size differs (%d != %d)\n", c->decomp_size, mszh_dlen); return -1; } encoded = c->decomp_buf; len = mszh_dlen; } break; case COMP_MSZH_NOCOMP: break; default: av_log(avctx, AV_LOG_ERROR, "BUG! Unknown MSZH compression in frame decoder.\n"); return -1; } break; #if CONFIG_ZLIB_DECODER case CODEC_ID_ZLIB: /* Using the original dll with normal compression (-1) and RGB format * gives a file with ZLIB fourcc, but frame is really uncompressed. * To be sure that's true check also frame size */ if (c->compression == COMP_ZLIB_NORMAL && c->imgtype == IMGTYPE_RGB24 && len == width * height * 3) break; if (c->flags & FLAG_MULTITHREAD) { int ret; mthread_inlen = AV_RL32(encoded); mthread_inlen = FFMIN(mthread_inlen, len - 8); mthread_outlen = AV_RL32(encoded+4); mthread_outlen = FFMIN(mthread_outlen, c->decomp_size); ret = zlib_decomp(avctx, encoded + 8, mthread_inlen, 0, mthread_outlen); if (ret < 0) return ret; ret = zlib_decomp(avctx, encoded + 8 + mthread_inlen, len - 8 - mthread_inlen, mthread_outlen, mthread_outlen); if (ret < 0) return ret; } else { int ret = zlib_decomp(avctx, encoded, len, 0, c->decomp_size); if (ret < 0) return ret; } encoded = c->decomp_buf; len = c->decomp_size; break; #endif default: av_log(avctx, AV_LOG_ERROR, "BUG! Unknown codec in frame decoder compression switch.\n"); return -1; } /* Apply PNG filter */ if (avctx->codec_id == CODEC_ID_ZLIB && (c->flags & FLAG_PNGFILTER)) { switch (c->imgtype) { case IMGTYPE_YUV111: case IMGTYPE_RGB24: for (row = 0; row < height; row++) { pixel_ptr = row * width * 3; yq = encoded[pixel_ptr++]; uqvq = AV_RL16(encoded+pixel_ptr); pixel_ptr += 2; for (col = 1; col < width; col++) { encoded[pixel_ptr] = yq -= encoded[pixel_ptr]; uqvq -= AV_RL16(encoded+pixel_ptr+1); AV_WL16(encoded+pixel_ptr+1, uqvq); pixel_ptr += 3; } } break; case IMGTYPE_YUV422: for (row = 0; row < height; row++) { pixel_ptr = row * width * 2; yq = uq = vq =0; for (col = 0; col < width/4; col++) { encoded[pixel_ptr] = yq -= encoded[pixel_ptr]; encoded[pixel_ptr+1] = yq -= encoded[pixel_ptr+1]; encoded[pixel_ptr+2] = yq -= encoded[pixel_ptr+2]; encoded[pixel_ptr+3] = yq -= encoded[pixel_ptr+3]; encoded[pixel_ptr+4] = uq -= encoded[pixel_ptr+4]; encoded[pixel_ptr+5] = uq -= encoded[pixel_ptr+5]; encoded[pixel_ptr+6] = vq -= encoded[pixel_ptr+6]; encoded[pixel_ptr+7] = vq -= encoded[pixel_ptr+7]; pixel_ptr += 8; } } break; case IMGTYPE_YUV411: for (row = 0; row < height; row++) { pixel_ptr = row * width / 2 * 3; yq = uq = vq =0; for (col = 0; col < width/4; col++) { encoded[pixel_ptr] = yq -= encoded[pixel_ptr]; encoded[pixel_ptr+1] = yq -= encoded[pixel_ptr+1]; encoded[pixel_ptr+2] = yq -= encoded[pixel_ptr+2]; encoded[pixel_ptr+3] = yq -= encoded[pixel_ptr+3]; encoded[pixel_ptr+4] = uq -= encoded[pixel_ptr+4]; encoded[pixel_ptr+5] = vq -= encoded[pixel_ptr+5]; pixel_ptr += 6; } } break; case IMGTYPE_YUV211: for (row = 0; row < height; row++) { pixel_ptr = row * width * 2; yq = uq = vq =0; for (col = 0; col < width/2; col++) { encoded[pixel_ptr] = yq -= encoded[pixel_ptr]; encoded[pixel_ptr+1] = yq -= encoded[pixel_ptr+1]; encoded[pixel_ptr+2] = uq -= encoded[pixel_ptr+2]; encoded[pixel_ptr+3] = vq -= encoded[pixel_ptr+3]; pixel_ptr += 4; } } break; case IMGTYPE_YUV420: for (row = 0; row < height/2; row++) { pixel_ptr = row * width * 3; yq = y1q = uq = vq =0; for (col = 0; col < width/2; col++) { encoded[pixel_ptr] = yq -= encoded[pixel_ptr]; encoded[pixel_ptr+1] = yq -= encoded[pixel_ptr+1]; encoded[pixel_ptr+2] = y1q -= encoded[pixel_ptr+2]; encoded[pixel_ptr+3] = y1q -= encoded[pixel_ptr+3]; encoded[pixel_ptr+4] = uq -= encoded[pixel_ptr+4]; encoded[pixel_ptr+5] = vq -= encoded[pixel_ptr+5]; pixel_ptr += 6; } } break; default: av_log(avctx, AV_LOG_ERROR, "BUG! Unknown imagetype in pngfilter switch.\n"); return -1; } } /* Convert colorspace */ y_out = c->pic.data[0] + (height - 1) * c->pic.linesize[0]; u_out = c->pic.data[1] + (height - 1) * c->pic.linesize[1]; v_out = c->pic.data[2] + (height - 1) * c->pic.linesize[2]; switch (c->imgtype) { case IMGTYPE_YUV111: for (row = 0; row < height; row++) { for (col = 0; col < width; col++) { y_out[col] = *encoded++; u_out[col] = *encoded++ + 128; v_out[col] = *encoded++ + 128; } y_out -= c->pic.linesize[0]; u_out -= c->pic.linesize[1]; v_out -= c->pic.linesize[2]; } break; case IMGTYPE_YUV422: for (row = 0; row < height; row++) { for (col = 0; col < width - 3; col += 4) { memcpy(y_out + col, encoded, 4); encoded += 4; u_out[ col >> 1 ] = *encoded++ + 128; u_out[(col >> 1) + 1] = *encoded++ + 128; v_out[ col >> 1 ] = *encoded++ + 128; v_out[(col >> 1) + 1] = *encoded++ + 128; } y_out -= c->pic.linesize[0]; u_out -= c->pic.linesize[1]; v_out -= c->pic.linesize[2]; } break; case IMGTYPE_RGB24: for (row = height - 1; row >= 0; row--) { pixel_ptr = row * c->pic.linesize[0]; memcpy(outptr + pixel_ptr, encoded, 3 * width); encoded += 3 * width; } break; case IMGTYPE_YUV411: for (row = 0; row < height; row++) { for (col = 0; col < width - 3; col += 4) { memcpy(y_out + col, encoded, 4); encoded += 4; u_out[col >> 2] = *encoded++ + 128; v_out[col >> 2] = *encoded++ + 128; } y_out -= c->pic.linesize[0]; u_out -= c->pic.linesize[1]; v_out -= c->pic.linesize[2]; } break; case IMGTYPE_YUV211: for (row = 0; row < height; row++) { for (col = 0; col < width - 1; col += 2) { memcpy(y_out + col, encoded, 2); encoded += 2; u_out[col >> 1] = *encoded++ + 128; v_out[col >> 1] = *encoded++ + 128; } y_out -= c->pic.linesize[0]; u_out -= c->pic.linesize[1]; v_out -= c->pic.linesize[2]; } break; case IMGTYPE_YUV420: u_out = c->pic.data[1] + ((height >> 1) - 1) * c->pic.linesize[1]; v_out = c->pic.data[2] + ((height >> 1) - 1) * c->pic.linesize[2]; for (row = 0; row < height - 1; row += 2) { for (col = 0; col < width - 1; col += 2) { memcpy(y_out + col, encoded, 2); encoded += 2; memcpy(y_out + col - c->pic.linesize[0], encoded, 2); encoded += 2; u_out[col >> 1] = *encoded++ + 128; v_out[col >> 1] = *encoded++ + 128; } y_out -= c->pic.linesize[0] << 1; u_out -= c->pic.linesize[1]; v_out -= c->pic.linesize[2]; } break; default: av_log(avctx, AV_LOG_ERROR, "BUG! Unknown imagetype in image decoder.\n"); return -1; } *data_size = sizeof(AVFrame); *(AVFrame*)data = c->pic; /* always report that the buffer was completely consumed */ return buf_size; } /* * * Init lcl decoder * */ static av_cold int decode_init(AVCodecContext *avctx) { LclDecContext * const c = avctx->priv_data; unsigned int basesize = avctx->width * avctx->height; unsigned int max_basesize = FFALIGN(avctx->width, 4) * FFALIGN(avctx->height, 4) + AV_LZO_OUTPUT_PADDING; unsigned int max_decomp_size; 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 && avctx->extradata[7] != CODEC_MSZH) || (avctx->codec_id == CODEC_ID_ZLIB && 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 = avctx->extradata[4]) { case IMGTYPE_YUV111: c->decomp_size = basesize * 3; max_decomp_size = max_basesize * 3; avctx->pix_fmt = PIX_FMT_YUV444P; av_log(avctx, AV_LOG_DEBUG, "Image type is YUV 1:1:1.\n"); break; case IMGTYPE_YUV422: c->decomp_size = basesize * 2; max_decomp_size = max_basesize * 2; avctx->pix_fmt = PIX_FMT_YUV422P; av_log(avctx, AV_LOG_DEBUG, "Image type is YUV 4:2:2.\n"); break; case IMGTYPE_RGB24: c->decomp_size = basesize * 3; max_decomp_size = max_basesize * 3; avctx->pix_fmt = PIX_FMT_BGR24; av_log(avctx, AV_LOG_DEBUG, "Image type is RGB 24.\n"); break; case IMGTYPE_YUV411: c->decomp_size = basesize / 2 * 3; max_decomp_size = max_basesize / 2 * 3; avctx->pix_fmt = PIX_FMT_YUV411P; av_log(avctx, AV_LOG_DEBUG, "Image type is YUV 4:1:1.\n"); break; case IMGTYPE_YUV211: c->decomp_size = basesize * 2; max_decomp_size = max_basesize * 2; avctx->pix_fmt = PIX_FMT_YUV422P; av_log(avctx, AV_LOG_DEBUG, "Image type is YUV 2:1:1.\n"); break; case IMGTYPE_YUV420: c->decomp_size = basesize / 2 * 3; max_decomp_size = max_basesize / 2 * 3; avctx->pix_fmt = PIX_FMT_YUV420P; av_log(avctx, AV_LOG_DEBUG, "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 = (int8_t)avctx->extradata[5]; switch (avctx->codec_id) { case CODEC_ID_MSZH: switch (c->compression) { case COMP_MSZH: av_log(avctx, AV_LOG_DEBUG, "Compression enabled.\n"); break; case COMP_MSZH_NOCOMP: c->decomp_size = 0; av_log(avctx, AV_LOG_DEBUG, "No compression.\n"); break; default: av_log(avctx, AV_LOG_ERROR, "Unsupported compression format for MSZH (%d).\n", c->compression); return 1; } break; #if CONFIG_ZLIB_DECODER case CODEC_ID_ZLIB: switch (c->compression) { case COMP_ZLIB_HISPEED: av_log(avctx, AV_LOG_DEBUG, "High speed compression.\n"); break; case COMP_ZLIB_HICOMP: av_log(avctx, AV_LOG_DEBUG, "High compression.\n"); break; case COMP_ZLIB_NORMAL: av_log(avctx, AV_LOG_DEBUG, "Normal compression.\n"); break; default: if (c->compression < Z_NO_COMPRESSION || c->compression > Z_BEST_COMPRESSION) { av_log(avctx, AV_LOG_ERROR, "Unsupported compression level for ZLIB: (%d).\n", c->compression); return 1; } av_log(avctx, AV_LOG_DEBUG, "Compression level for ZLIB: (%d).\n", c->compression); } break; #endif default: av_log(avctx, AV_LOG_ERROR, "BUG! Unknown codec in compression switch.\n"); return 1; } /* Allocate decompression buffer */ if (c->decomp_size) { if ((c->decomp_buf = av_malloc(max_decomp_size)) == NULL) { av_log(avctx, AV_LOG_ERROR, "Can't allocate decompression buffer.\n"); return 1; } } /* Detect flags */ c->flags = avctx->extradata[6]; if (c->flags & FLAG_MULTITHREAD) av_log(avctx, AV_LOG_DEBUG, "Multithread encoder flag set.\n"); if (c->flags & FLAG_NULLFRAME) av_log(avctx, AV_LOG_DEBUG, "Nullframe insertion flag set.\n"); if (avctx->codec_id == CODEC_ID_ZLIB && (c->flags & FLAG_PNGFILTER)) av_log(avctx, AV_LOG_DEBUG, "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 CONFIG_ZLIB_DECODER if (avctx->codec_id == CODEC_ID_ZLIB) { int zret; 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); av_freep(&c->decomp_buf); return 1; } } #endif return 0; } /* * * Uninit lcl decoder * */ static av_cold int decode_end(AVCodecContext *avctx) { LclDecContext * const c = avctx->priv_data; av_freep(&c->decomp_buf); if (c->pic.data[0]) avctx->release_buffer(avctx, &c->pic); #if CONFIG_ZLIB_DECODER if (avctx->codec_id == CODEC_ID_ZLIB) inflateEnd(&c->zstream); #endif return 0; } #if CONFIG_MSZH_DECODER AVCodec ff_mszh_decoder = { "mszh", AVMEDIA_TYPE_VIDEO, CODEC_ID_MSZH, sizeof(LclDecContext), decode_init, NULL, decode_end, decode_frame, CODEC_CAP_DR1, .long_name = NULL_IF_CONFIG_SMALL("LCL (LossLess Codec Library) MSZH"), }; #endif #if CONFIG_ZLIB_DECODER AVCodec ff_zlib_decoder = { "zlib", AVMEDIA_TYPE_VIDEO, CODEC_ID_ZLIB, sizeof(LclDecContext), decode_init, NULL, decode_end, decode_frame, CODEC_CAP_DR1, .long_name = NULL_IF_CONFIG_SMALL("LCL (LossLess Codec Library) ZLIB"), }; #endif