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https://gitee.com/openharmony/third_party_ffmpeg
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3b0fb00990
Signed-off-by: cyberbox <468042667@qq.com> Change-Id: I63cc2a8c9ff6197c67d6b6b47c124882ad942a22
675 lines
24 KiB
C
675 lines
24 KiB
C
/*
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* LCL (LossLess Codec Library) Codec
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* Copyright (c) 2002-2004 Roberto Togni
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file
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* LCL (LossLess Codec Library) Video Codec
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* Decoder for MSZH and ZLIB codecs
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* Experimental encoder for ZLIB RGB24
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*
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* Fourcc: MSZH, ZLIB
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*
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* Original Win32 dll:
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* Ver2.23 By Kenji Oshima 2000.09.20
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* avimszh.dll, avizlib.dll
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*
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* A description of the decoding algorithm can be found here:
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* http://www.pcisys.net/~melanson/codecs
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*
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* Supports: BGR24 (RGB 24bpp)
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*/
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#include "config_components.h"
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#include <stdio.h>
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#include <stdlib.h>
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#include "libavutil/mem.h"
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#include "libavutil/pixdesc.h"
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#include "avcodec.h"
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#include "bytestream.h"
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#include "codec_internal.h"
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#include "lcl.h"
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#include "thread.h"
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#if CONFIG_ZLIB_DECODER
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#include "zlib_wrapper.h"
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#include <zlib.h>
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#endif
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typedef struct LclDecContext {
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// Image type
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int imgtype;
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// Compression type
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int compression;
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// Flags
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int flags;
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// Decompressed data size
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unsigned int decomp_size;
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// Decompression buffer
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unsigned char* decomp_buf;
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#if CONFIG_ZLIB_DECODER
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FFZStream zstream;
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#endif
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} LclDecContext;
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/**
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* @param srcptr compressed source buffer, must be padded with at least 5 extra bytes
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* @param destptr must be padded sufficiently for av_memcpy_backptr
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*/
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static unsigned int mszh_decomp(const unsigned char * srcptr, int srclen, unsigned char * destptr, unsigned int destsize)
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{
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unsigned char *destptr_bak = destptr;
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unsigned char *destptr_end = destptr + destsize;
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const unsigned char *srcptr_end = srcptr + srclen;
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unsigned mask = *srcptr++;
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unsigned maskbit = 0x80;
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while (srcptr < srcptr_end && destptr < destptr_end) {
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if (!(mask & maskbit)) {
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memcpy(destptr, srcptr, 4);
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destptr += 4;
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srcptr += 4;
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} else {
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unsigned ofs = bytestream_get_le16(&srcptr);
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unsigned cnt = (ofs >> 11) + 1;
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ofs &= 0x7ff;
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ofs = FFMIN(ofs, destptr - destptr_bak);
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cnt *= 4;
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cnt = FFMIN(cnt, destptr_end - destptr);
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if (ofs) {
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av_memcpy_backptr(destptr, ofs, cnt);
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} else {
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// Not known what the correct behaviour is, but
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// this at least avoids uninitialized data.
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memset(destptr, 0, cnt);
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}
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destptr += cnt;
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}
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maskbit >>= 1;
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if (!maskbit) {
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mask = *srcptr++;
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while (!mask) {
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if (destptr_end - destptr < 32 || srcptr_end - srcptr < 32) break;
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memcpy(destptr, srcptr, 32);
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destptr += 32;
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srcptr += 32;
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mask = *srcptr++;
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}
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maskbit = 0x80;
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}
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}
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return destptr - destptr_bak;
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}
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#if CONFIG_ZLIB_DECODER
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/**
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* @brief decompress a zlib-compressed data block into decomp_buf
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* @param src compressed input buffer
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* @param src_len data length in input buffer
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* @param offset offset in decomp_buf
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* @param expected expected decompressed length
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*/
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static int zlib_decomp(AVCodecContext *avctx, const uint8_t *src, int src_len, int offset, int expected)
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{
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LclDecContext *c = avctx->priv_data;
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z_stream *const zstream = &c->zstream.zstream;
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int zret = inflateReset(zstream);
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if (zret != Z_OK) {
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av_log(avctx, AV_LOG_ERROR, "Inflate reset error: %d\n", zret);
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return AVERROR_UNKNOWN;
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}
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zstream->next_in = src;
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zstream->avail_in = src_len;
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zstream->next_out = c->decomp_buf + offset;
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zstream->avail_out = c->decomp_size - offset;
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zret = inflate(zstream, Z_FINISH);
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if (zret != Z_OK && zret != Z_STREAM_END) {
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av_log(avctx, AV_LOG_ERROR, "Inflate error: %d\n", zret);
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return AVERROR_UNKNOWN;
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}
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if (expected != (unsigned int)zstream->total_out) {
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av_log(avctx, AV_LOG_ERROR, "Decoded size differs (%d != %lu)\n",
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expected, zstream->total_out);
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if (expected > (unsigned int)zstream->total_out)
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return (unsigned int)zstream->total_out;
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return AVERROR_UNKNOWN;
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}
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return zstream->total_out;
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}
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#endif
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static int decode_frame(AVCodecContext *avctx, AVFrame *frame,
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int *got_frame, AVPacket *avpkt)
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{
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const uint8_t *buf = avpkt->data;
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int buf_size = avpkt->size;
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LclDecContext * const c = avctx->priv_data;
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unsigned int pixel_ptr;
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int row, col;
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unsigned char *encoded = avpkt->data, *outptr;
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uint8_t *y_out, *u_out, *v_out;
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int width = avctx->width; // Real image width
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int height = avctx->height; // Real image height
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unsigned int mszh_dlen;
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unsigned char yq, y1q, uq, vq;
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int uqvq, ret;
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unsigned int mthread_inlen, mthread_outlen;
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unsigned int len = buf_size;
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int linesize, offset;
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if ((ret = ff_thread_get_buffer(avctx, frame, 0)) < 0)
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return ret;
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outptr = frame->data[0]; // Output image pointer
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/* Decompress frame */
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switch (avctx->codec_id) {
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case AV_CODEC_ID_MSZH:
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switch (c->compression) {
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case COMP_MSZH:
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if (c->imgtype == IMGTYPE_RGB24 && len == FFALIGN(width * 3, 4) * height ||
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c->imgtype == IMGTYPE_YUV111 && len == width * height * 3) {
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;
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} else if (c->flags & FLAG_MULTITHREAD) {
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mthread_inlen = AV_RL32(buf);
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if (len < 8 || len - 8 < mthread_inlen) {
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av_log(avctx, AV_LOG_ERROR, "len %d is too small\n", len);
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return AVERROR_INVALIDDATA;
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}
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mthread_outlen = AV_RL32(buf + 4);
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mthread_outlen = FFMIN(mthread_outlen, c->decomp_size);
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mszh_dlen = mszh_decomp(buf + 8, mthread_inlen, c->decomp_buf, c->decomp_size);
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if (mthread_outlen != mszh_dlen) {
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av_log(avctx, AV_LOG_ERROR, "Mthread1 decoded size differs (%d != %d)\n",
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mthread_outlen, mszh_dlen);
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return AVERROR_INVALIDDATA;
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}
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mszh_dlen = mszh_decomp(buf + 8 + mthread_inlen, len - 8 - mthread_inlen,
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c->decomp_buf + mthread_outlen, c->decomp_size - mthread_outlen);
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if (mthread_outlen != mszh_dlen) {
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av_log(avctx, AV_LOG_ERROR, "Mthread2 decoded size differs (%d != %d)\n",
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mthread_outlen, mszh_dlen);
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return AVERROR_INVALIDDATA;
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}
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encoded = c->decomp_buf;
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len = c->decomp_size;
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} else {
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mszh_dlen = mszh_decomp(buf, len, c->decomp_buf, c->decomp_size);
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if (c->decomp_size != mszh_dlen) {
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av_log(avctx, AV_LOG_ERROR, "Decoded size differs (%d != %d)\n",
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c->decomp_size, mszh_dlen);
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return AVERROR_INVALIDDATA;
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}
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encoded = c->decomp_buf;
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len = mszh_dlen;
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}
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break;
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case COMP_MSZH_NOCOMP: {
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int bppx2;
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int aligned_width = width;
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switch (c->imgtype) {
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case IMGTYPE_YUV111:
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case IMGTYPE_RGB24:
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bppx2 = 6;
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break;
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case IMGTYPE_YUV422:
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aligned_width &= ~3;
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case IMGTYPE_YUV211:
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bppx2 = 4;
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break;
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case IMGTYPE_YUV411:
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aligned_width &= ~3;
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case IMGTYPE_YUV420:
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bppx2 = 3;
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break;
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default:
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bppx2 = 0; // will error out below
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break;
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}
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if (len < ((aligned_width * height * bppx2) >> 1))
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return AVERROR_INVALIDDATA;
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break;
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}
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default:
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av_log(avctx, AV_LOG_ERROR, "BUG! Unknown MSZH compression in frame decoder.\n");
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return AVERROR_INVALIDDATA;
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}
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break;
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#if CONFIG_ZLIB_DECODER
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case AV_CODEC_ID_ZLIB:
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/* Using the original dll with normal compression (-1) and RGB format
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* gives a file with ZLIB fourcc, but frame is really uncompressed.
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* To be sure that's true check also frame size */
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if (c->compression == COMP_ZLIB_NORMAL && c->imgtype == IMGTYPE_RGB24 &&
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len == width * height * 3) {
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if (c->flags & FLAG_PNGFILTER) {
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memcpy(c->decomp_buf, buf, len);
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encoded = c->decomp_buf;
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} else {
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break;
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}
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} else if (c->flags & FLAG_MULTITHREAD) {
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mthread_inlen = AV_RL32(buf);
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mthread_inlen = FFMIN(mthread_inlen, len - 8);
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mthread_outlen = AV_RL32(buf + 4);
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mthread_outlen = FFMIN(mthread_outlen, c->decomp_size);
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ret = zlib_decomp(avctx, buf + 8, mthread_inlen, 0, mthread_outlen);
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if (ret < 0) return ret;
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ret = zlib_decomp(avctx, buf + 8 + mthread_inlen, len - 8 - mthread_inlen,
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mthread_outlen, mthread_outlen);
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if (ret < 0) return ret;
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len = c->decomp_size;
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} else {
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int ret = zlib_decomp(avctx, buf, len, 0, c->decomp_size);
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if (ret < 0) return ret;
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len = ret;
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}
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encoded = c->decomp_buf;
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break;
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#endif
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default:
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av_log(avctx, AV_LOG_ERROR, "BUG! Unknown codec in frame decoder compression switch.\n");
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return AVERROR_INVALIDDATA;
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}
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/* Apply PNG filter */
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if (avctx->codec_id == AV_CODEC_ID_ZLIB && (c->flags & FLAG_PNGFILTER)) {
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switch (c->imgtype) {
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case IMGTYPE_YUV111:
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case IMGTYPE_RGB24:
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for (row = 0; row < height; row++) {
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pixel_ptr = row * width * 3;
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yq = encoded[pixel_ptr++];
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uqvq = AV_RL16(encoded+pixel_ptr);
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pixel_ptr += 2;
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for (col = 1; col < width; col++) {
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encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
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uqvq -= AV_RL16(encoded+pixel_ptr+1);
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AV_WL16(encoded+pixel_ptr+1, uqvq);
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pixel_ptr += 3;
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}
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}
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break;
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case IMGTYPE_YUV422:
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pixel_ptr = 0;
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for (row = 0; row < height; row++) {
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yq = uq = vq =0;
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for (col = 0; col < width/4; col++) {
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encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
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encoded[pixel_ptr+1] = yq -= encoded[pixel_ptr+1];
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encoded[pixel_ptr+2] = yq -= encoded[pixel_ptr+2];
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encoded[pixel_ptr+3] = yq -= encoded[pixel_ptr+3];
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encoded[pixel_ptr+4] = uq -= encoded[pixel_ptr+4];
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encoded[pixel_ptr+5] = uq -= encoded[pixel_ptr+5];
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encoded[pixel_ptr+6] = vq -= encoded[pixel_ptr+6];
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encoded[pixel_ptr+7] = vq -= encoded[pixel_ptr+7];
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pixel_ptr += 8;
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}
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}
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break;
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case IMGTYPE_YUV411:
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pixel_ptr = 0;
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for (row = 0; row < height; row++) {
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yq = uq = vq =0;
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for (col = 0; col < width/4; col++) {
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encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
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encoded[pixel_ptr+1] = yq -= encoded[pixel_ptr+1];
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encoded[pixel_ptr+2] = yq -= encoded[pixel_ptr+2];
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encoded[pixel_ptr+3] = yq -= encoded[pixel_ptr+3];
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encoded[pixel_ptr+4] = uq -= encoded[pixel_ptr+4];
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encoded[pixel_ptr+5] = vq -= encoded[pixel_ptr+5];
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pixel_ptr += 6;
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}
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}
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break;
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case IMGTYPE_YUV211:
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for (row = 0; row < height; row++) {
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pixel_ptr = row * width * 2;
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yq = uq = vq =0;
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for (col = 0; col < width/2; col++) {
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encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
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encoded[pixel_ptr+1] = yq -= encoded[pixel_ptr+1];
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encoded[pixel_ptr+2] = uq -= encoded[pixel_ptr+2];
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encoded[pixel_ptr+3] = vq -= encoded[pixel_ptr+3];
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pixel_ptr += 4;
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}
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}
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break;
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case IMGTYPE_YUV420:
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for (row = 0; row < height/2; row++) {
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pixel_ptr = row * width * 3;
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yq = y1q = uq = vq =0;
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for (col = 0; col < width/2; col++) {
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encoded[pixel_ptr] = yq -= encoded[pixel_ptr];
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encoded[pixel_ptr+1] = yq -= encoded[pixel_ptr+1];
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encoded[pixel_ptr+2] = y1q -= encoded[pixel_ptr+2];
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encoded[pixel_ptr+3] = y1q -= encoded[pixel_ptr+3];
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encoded[pixel_ptr+4] = uq -= encoded[pixel_ptr+4];
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encoded[pixel_ptr+5] = vq -= encoded[pixel_ptr+5];
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pixel_ptr += 6;
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}
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}
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break;
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default:
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av_log(avctx, AV_LOG_ERROR, "BUG! Unknown imagetype in pngfilter switch.\n");
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return AVERROR_INVALIDDATA;
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}
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}
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/* Convert colorspace */
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y_out = frame->data[0] + (height - 1) * frame->linesize[0];
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offset = (height - 1) * frame->linesize[1];
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u_out = FF_PTR_ADD(frame->data[1], offset);
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offset = (height - 1) * frame->linesize[2];
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v_out = FF_PTR_ADD(frame->data[2], offset);
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switch (c->imgtype) {
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case IMGTYPE_YUV111:
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for (row = 0; row < height; row++) {
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for (col = 0; col < width; col++) {
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y_out[col] = *encoded++;
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u_out[col] = *encoded++ + 128;
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v_out[col] = *encoded++ + 128;
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}
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y_out -= frame->linesize[0];
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u_out -= frame->linesize[1];
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v_out -= frame->linesize[2];
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}
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break;
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case IMGTYPE_YUV422:
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for (row = 0; row < height; row++) {
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for (col = 0; col < width - 3; col += 4) {
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memcpy(y_out + col, encoded, 4);
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encoded += 4;
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u_out[ col >> 1 ] = *encoded++ + 128;
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u_out[(col >> 1) + 1] = *encoded++ + 128;
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v_out[ col >> 1 ] = *encoded++ + 128;
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v_out[(col >> 1) + 1] = *encoded++ + 128;
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}
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if (col && col < width) {
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u_out[ col >> 1 ] = u_out[(col>>1) - 1];
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v_out[ col >> 1 ] = v_out[(col>>1) - 1];
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}
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y_out -= frame->linesize[0];
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u_out -= frame->linesize[1];
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v_out -= frame->linesize[2];
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}
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break;
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case IMGTYPE_RGB24:
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linesize = len < FFALIGN(3 * width, 4) * height ? 3 * width : FFALIGN(3 * width, 4);
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for (row = height - 1; row >= 0; row--) {
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pixel_ptr = row * frame->linesize[0];
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memcpy(outptr + pixel_ptr, encoded, 3 * width);
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encoded += linesize;
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}
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break;
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case IMGTYPE_YUV411:
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for (row = 0; row < height; row++) {
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for (col = 0; col < width - 3; col += 4) {
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memcpy(y_out + col, encoded, 4);
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encoded += 4;
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u_out[col >> 2] = *encoded++ + 128;
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v_out[col >> 2] = *encoded++ + 128;
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}
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if (col && col < width) {
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u_out[col >> 2] = u_out[(col>>2) - 1];
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v_out[col >> 2] = v_out[(col>>2) - 1];
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}
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y_out -= frame->linesize[0];
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u_out -= frame->linesize[1];
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v_out -= frame->linesize[2];
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}
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break;
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case IMGTYPE_YUV211:
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for (row = 0; row < height; row++) {
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for (col = 0; col < width - 1; col += 2) {
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memcpy(y_out + col, encoded, 2);
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encoded += 2;
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u_out[col >> 1] = *encoded++ + 128;
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|
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;
|
|
}
|
|
|
|
frame->key_frame = 1;
|
|
frame->pict_type = AV_PICTURE_TYPE_I;
|
|
|
|
*got_frame = 1;
|
|
|
|
/* always report that the buffer was completely consumed */
|
|
return buf_size;
|
|
}
|
|
|
|
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;
|
|
int subsample_h, subsample_v;
|
|
int partial_h_supported = 0;
|
|
|
|
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 = (avctx->width & ~3) * avctx->height * 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");
|
|
partial_h_supported = 1;
|
|
break;
|
|
case IMGTYPE_RGB24:
|
|
c->decomp_size = FFALIGN(avctx->width*3, 4) * avctx->height;
|
|
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 = (avctx->width & ~3) * avctx->height / 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");
|
|
partial_h_supported = 1;
|
|
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;
|
|
}
|
|
|
|
av_pix_fmt_get_chroma_sub_sample(avctx->pix_fmt, &subsample_h, &subsample_v);
|
|
if ((avctx->width % (1<<subsample_h) && !partial_h_supported) || avctx->height % (1<<subsample_v)) {
|
|
avpriv_request_sample(avctx, "Unsupported dimensions");
|
|
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))) {
|
|
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)
|
|
return ff_inflate_init(&c->zstream, avctx);
|
|
#endif
|
|
|
|
return 0;
|
|
}
|
|
|
|
static av_cold int decode_end(AVCodecContext *avctx)
|
|
{
|
|
LclDecContext * const c = avctx->priv_data;
|
|
|
|
av_freep(&c->decomp_buf);
|
|
#if CONFIG_ZLIB_DECODER
|
|
ff_inflate_end(&c->zstream);
|
|
#endif
|
|
|
|
return 0;
|
|
}
|
|
|
|
#if CONFIG_MSZH_DECODER
|
|
const FFCodec ff_mszh_decoder = {
|
|
.p.name = "mszh",
|
|
.p.long_name = NULL_IF_CONFIG_SMALL("LCL (LossLess Codec Library) MSZH"),
|
|
.p.type = AVMEDIA_TYPE_VIDEO,
|
|
.p.id = AV_CODEC_ID_MSZH,
|
|
.p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_FRAME_THREADS,
|
|
.priv_data_size = sizeof(LclDecContext),
|
|
.init = decode_init,
|
|
.close = decode_end,
|
|
FF_CODEC_DECODE_CB(decode_frame),
|
|
.caps_internal = FF_CODEC_CAP_INIT_THREADSAFE | FF_CODEC_CAP_INIT_CLEANUP,
|
|
};
|
|
#endif
|
|
|
|
#if CONFIG_ZLIB_DECODER
|
|
const FFCodec ff_zlib_decoder = {
|
|
.p.name = "zlib",
|
|
.p.long_name = NULL_IF_CONFIG_SMALL("LCL (LossLess Codec Library) ZLIB"),
|
|
.p.type = AVMEDIA_TYPE_VIDEO,
|
|
.p.id = AV_CODEC_ID_ZLIB,
|
|
.p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_FRAME_THREADS,
|
|
.priv_data_size = sizeof(LclDecContext),
|
|
.init = decode_init,
|
|
.close = decode_end,
|
|
FF_CODEC_DECODE_CB(decode_frame),
|
|
.caps_internal = FF_CODEC_CAP_INIT_THREADSAFE | FF_CODEC_CAP_INIT_CLEANUP,
|
|
};
|
|
#endif
|