making act segmenter

1 files changed, 665 insertions, 0 deletions

diff --git a/ffmpeg/libavcodec/lcldec.c b/ffmpeg/libavcodec/lcldec.c
new file mode 100644
index 0000000..7948199
--- /dev/null
+++ b/ffmpeg/libavcodec/lcldec.c
@@ -0,0 +1,665 @@
+/*
+ * LCL (LossLess Codec Library) Codec
+ * Copyright (c) 2002-2004 Roberto Togni
+ *
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg 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.
+ *
+ * FFmpeg 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 FFmpeg; 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 "libavutil/mem.h"
+#include "avcodec.h"
+#include "bytestream.h"
+#include "internal.h"
+#include "lcl.h"
+
+#if CONFIG_ZLIB_DECODER
+#include <zlib.h>
+#endif
+
+/*
+ * Decoder context
+ */
+typedef struct LclDecContext {
+    // 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);
+            if (ofs) {
+                av_memcpy_backptr(destptr, ofs, cnt);
+            } else {
+                // Not known what the correct behaviour is, but
+                // this at least avoids uninitialized data.
+                memset(destptr, 0, 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 AVERROR_UNKNOWN;
+    }
+    c->zstream.next_in = (uint8_t *)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 AVERROR_UNKNOWN;
+    }
+    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 AVERROR_UNKNOWN;
+    }
+    return c->zstream.total_out;
+}
+#endif
+
+
+/*
+ *
+ * Decode a frame
+ *
+ */
+static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
+{
+    AVFrame *frame = data;
+    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, ret;
+    unsigned int mthread_inlen, mthread_outlen;
+    unsigned int len = buf_size;
+
+    if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
+        return ret;
+
+    outptr = frame->data[0]; // Output image pointer
+
+    /* Decompress frame */
+    switch (avctx->codec_id) {
+    case AV_CODEC_ID_MSZH:
+        switch (c->compression) {
+        case COMP_MSZH:
+            if (c->imgtype == IMGTYPE_RGB24 && len == width * height * 3) {
+                ;
+            } else if (c->flags & FLAG_MULTITHREAD) {
+                mthread_inlen = AV_RL32(encoded);
+                if (len < 8) {
+                    av_log(avctx, AV_LOG_ERROR, "len %d is too small\n", len);
+                    return AVERROR_INVALIDDATA;
+                }
+                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 AVERROR_INVALIDDATA;
+                }
+                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 AVERROR_INVALIDDATA;
+                }
+                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 AVERROR_INVALIDDATA;
+                }
+                encoded = c->decomp_buf;
+                len = mszh_dlen;
+            }
+            break;
+        case COMP_MSZH_NOCOMP: {
+            int bppx2;
+            switch (c->imgtype) {
+            case IMGTYPE_YUV111:
+            case IMGTYPE_RGB24:
+                bppx2 = 6;
+                break;
+            case IMGTYPE_YUV422:
+            case IMGTYPE_YUV211:
+                bppx2 = 4;
+                break;
+            case IMGTYPE_YUV411:
+            case IMGTYPE_YUV420:
+                bppx2 = 3;
+                break;
+            default:
+                bppx2 = 0; // will error out below
+                break;
+            }
+            if (len < ((width * height * bppx2) >> 1))
+                return AVERROR_INVALIDDATA;
+            break;
+        }
+        default:
+            av_log(avctx, AV_LOG_ERROR, "BUG! Unknown MSZH compression in frame decoder.\n");
+            return AVERROR_INVALIDDATA;
+        }
+        break;
+#if CONFIG_ZLIB_DECODER
+    case AV_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) {
+            if (c->flags & FLAG_PNGFILTER) {
+                memcpy(c->decomp_buf, encoded, len);
+                encoded = c->decomp_buf;
+            } else {
+                break;
+            }
+        } else 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);
+            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 AVERROR_INVALIDDATA;
+    }
+
+
+    /* Apply PNG filter */
+    if (avctx->codec_id == AV_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 AVERROR_INVALIDDATA;
+        }
+    }
+
+    /* Convert colorspace */
+    y_out = frame->data[0] + (height - 1) * frame->linesize[0];
+    u_out = frame->data[1] + (height - 1) * frame->linesize[1];
+    v_out = frame->data[2] + (height - 1) * frame->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 -= frame->linesize[0];
+            u_out -= frame->linesize[1];
+            v_out -= frame->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 -= frame->linesize[0];
+            u_out -= frame->linesize[1];
+            v_out -= frame->linesize[2];
+        }
+        break;
+    case IMGTYPE_RGB24:
+        for (row = height - 1; row >= 0; row--) {
+            pixel_ptr = row * frame->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 -= frame->linesize[0];
+            u_out -= frame->linesize[1];
+            v_out -= frame->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 -= frame->linesize[0];
+            u_out -= frame->linesize[1];
+            v_out -= frame->linesize[2];
+        }
+        break;
+    case IMGTYPE_YUV420:
+        u_out = frame->data[1] + ((height >> 1) - 1) * frame->linesize[1];
+        v_out = frame->data[2] + ((height >> 1) - 1) * frame->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 - frame->linesize[0], encoded, 2);
+                encoded += 2;
+                u_out[col >> 1] = *encoded++ + 128;
+                v_out[col >> 1] = *encoded++ + 128;
+            }
+            y_out -= frame->linesize[0] << 1;
+            u_out -= frame->linesize[1];
+            v_out -= frame->linesize[2];
+        }
+        break;
+    default:
+        av_log(avctx, AV_LOG_ERROR, "BUG! Unknown imagetype in image decoder.\n");
+        return AVERROR_INVALIDDATA;
+    }
+
+    *got_frame = 1;
+
+    /* 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);
+    unsigned int max_decomp_size;
+
+    if (avctx->extradata_size < 8) {
+        av_log(avctx, AV_LOG_ERROR, "Extradata size too small.\n");
+        return AVERROR_INVALIDDATA;
+    }
+
+    /* Check codec type */
+    if ((avctx->codec_id == AV_CODEC_ID_MSZH  && avctx->extradata[7] != CODEC_MSZH) ||
+        (avctx->codec_id == AV_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 = AV_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 = AV_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 = AV_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 = AV_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 = AV_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 = AV_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 AVERROR_INVALIDDATA;
+    }
+
+    /* Detect compression method */
+    c->compression = (int8_t)avctx->extradata[5];
+    switch (avctx->codec_id) {
+    case AV_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 AVERROR_INVALIDDATA;
+        }
+        break;
+#if CONFIG_ZLIB_DECODER
+    case AV_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 AVERROR_INVALIDDATA;
+            }
+            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 AVERROR_INVALIDDATA;
+    }
+
+    /* 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 AVERROR(ENOMEM);
+        }
+    }
+
+    /* 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 == AV_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 == AV_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 AVERROR_UNKNOWN;
+        }
+    }
+#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 CONFIG_ZLIB_DECODER
+    if (avctx->codec_id == AV_CODEC_ID_ZLIB)
+        inflateEnd(&c->zstream);
+#endif
+
+    return 0;
+}
+
+#if CONFIG_MSZH_DECODER
+AVCodec ff_mszh_decoder = {
+    .name           = "mszh",
+    .type           = AVMEDIA_TYPE_VIDEO,
+    .id             = AV_CODEC_ID_MSZH,
+    .priv_data_size = sizeof(LclDecContext),
+    .init           = decode_init,
+    .close          = decode_end,
+    .decode         = decode_frame,
+    .capabilities   = CODEC_CAP_DR1,
+    .long_name      = NULL_IF_CONFIG_SMALL("LCL (LossLess Codec Library) MSZH"),
+};
+#endif
+
+#if CONFIG_ZLIB_DECODER
+AVCodec ff_zlib_decoder = {
+    .name           = "zlib",
+    .type           = AVMEDIA_TYPE_VIDEO,
+    .id             = AV_CODEC_ID_ZLIB,
+    .priv_data_size = sizeof(LclDecContext),
+    .init           = decode_init,
+    .close          = decode_end,
+    .decode         = decode_frame,
+    .capabilities   = CODEC_CAP_DR1,
+    .long_name      = NULL_IF_CONFIG_SMALL("LCL (LossLess Codec Library) ZLIB"),
+};
+#endif