193 lines
5.8 KiB
C
193 lines
5.8 KiB
C
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/*
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* MatchWare Screen Capture Codec decoder
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*
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* Copyright (c) 2018 Paul B Mahol
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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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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "avcodec.h"
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#include "bytestream.h"
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#include "internal.h"
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#include <zlib.h>
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typedef struct MWSCContext {
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unsigned int decomp_size;
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uint8_t *decomp_buf;
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z_stream zstream;
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AVFrame *prev_frame;
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} MWSCContext;
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static int rle_uncompress(GetByteContext *gb, PutByteContext *pb, GetByteContext *gbp,
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int width, int height, int stride, int pb_linesize, int gbp_linesize)
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{
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int intra = 1, w = 0;
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bytestream2_seek_p(pb, (height - 1) * pb_linesize, SEEK_SET);
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while (bytestream2_get_bytes_left(gb) > 0) {
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uint32_t fill = bytestream2_get_le24(gb);
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unsigned run = bytestream2_get_byte(gb);
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if (run == 0) {
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run = bytestream2_get_le32(gb);
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for (int j = 0; j < run; j++, w++) {
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if (w == width) {
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w = 0;
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bytestream2_seek_p(pb, -(pb_linesize + stride), SEEK_CUR);
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}
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bytestream2_put_le24(pb, fill);
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}
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} else if (run == 255) {
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int pos = bytestream2_tell_p(pb);
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bytestream2_seek(gbp, pos, SEEK_SET);
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for (int j = 0; j < fill; j++, w++) {
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if (w == width) {
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w = 0;
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bytestream2_seek_p(pb, -(pb_linesize + stride), SEEK_CUR);
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bytestream2_seek(gbp, -(gbp_linesize + stride), SEEK_CUR);
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}
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bytestream2_put_le24(pb, bytestream2_get_le24(gbp));
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}
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intra = 0;
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} else {
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for (int j = 0; j < run; j++, w++) {
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if (w == width) {
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w = 0;
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bytestream2_seek_p(pb, -(pb_linesize + stride), SEEK_CUR);
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}
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bytestream2_put_le24(pb, fill);
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}
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}
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}
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return intra;
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}
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static int decode_frame(AVCodecContext *avctx,
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void *data, int *got_frame,
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AVPacket *avpkt)
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{
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MWSCContext *s = avctx->priv_data;
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AVFrame *frame = data;
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uint8_t *buf = avpkt->data;
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int buf_size = avpkt->size;
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GetByteContext gb;
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GetByteContext gbp;
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PutByteContext pb;
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int ret;
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ret = inflateReset(&s->zstream);
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if (ret != Z_OK) {
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av_log(avctx, AV_LOG_ERROR, "Inflate reset error: %d\n", ret);
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return AVERROR_EXTERNAL;
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}
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s->zstream.next_in = buf;
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s->zstream.avail_in = buf_size;
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s->zstream.next_out = s->decomp_buf;
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s->zstream.avail_out = s->decomp_size;
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ret = inflate(&s->zstream, Z_FINISH);
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if (ret != Z_STREAM_END) {
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av_log(avctx, AV_LOG_ERROR, "Inflate error: %d\n", ret);
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return AVERROR_EXTERNAL;
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}
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if ((ret = ff_get_buffer(avctx, frame, AV_GET_BUFFER_FLAG_REF)) < 0)
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return ret;
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bytestream2_init(&gb, s->decomp_buf, s->zstream.total_out);
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bytestream2_init(&gbp, s->prev_frame->data[0], avctx->height * s->prev_frame->linesize[0]);
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bytestream2_init_writer(&pb, frame->data[0], avctx->height * frame->linesize[0]);
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frame->key_frame = rle_uncompress(&gb, &pb, &gbp, avctx->width, avctx->height, avctx->width * 3,
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frame->linesize[0], s->prev_frame->linesize[0]);
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frame->pict_type = frame->key_frame ? AV_PICTURE_TYPE_I : AV_PICTURE_TYPE_P;
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av_frame_unref(s->prev_frame);
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if ((ret = av_frame_ref(s->prev_frame, frame)) < 0)
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return ret;
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*got_frame = 1;
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return avpkt->size;
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}
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static av_cold int decode_init(AVCodecContext *avctx)
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{
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MWSCContext *s = avctx->priv_data;
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int64_t size;
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int zret;
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avctx->pix_fmt = AV_PIX_FMT_BGR24;
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size = 32LL * avctx->height * avctx->width;
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if (size >= INT32_MAX)
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return AVERROR_INVALIDDATA;
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s->decomp_size = size;
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if (!(s->decomp_buf = av_malloc(s->decomp_size)))
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return AVERROR(ENOMEM);
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s->zstream.zalloc = Z_NULL;
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s->zstream.zfree = Z_NULL;
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s->zstream.opaque = Z_NULL;
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zret = inflateInit(&s->zstream);
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if (zret != Z_OK) {
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av_log(avctx, AV_LOG_ERROR, "Inflate init error: %d\n", zret);
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return AVERROR_EXTERNAL;
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}
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s->prev_frame = av_frame_alloc();
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if (!s->prev_frame)
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return AVERROR(ENOMEM);
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return 0;
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}
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static av_cold int decode_close(AVCodecContext *avctx)
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{
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MWSCContext *s = avctx->priv_data;
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av_frame_free(&s->prev_frame);
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av_freep(&s->decomp_buf);
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s->decomp_size = 0;
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inflateEnd(&s->zstream);
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return 0;
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}
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AVCodec ff_mwsc_decoder = {
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.name = "mwsc",
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.long_name = NULL_IF_CONFIG_SMALL("MatchWare Screen Capture Codec"),
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.type = AVMEDIA_TYPE_VIDEO,
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.id = AV_CODEC_ID_MWSC,
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.priv_data_size = sizeof(MWSCContext),
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.init = decode_init,
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.close = decode_close,
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.decode = decode_frame,
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.capabilities = AV_CODEC_CAP_DR1,
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.caps_internal = FF_CODEC_CAP_INIT_THREADSAFE |
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FF_CODEC_CAP_INIT_CLEANUP,
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};
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