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mirror of https://github.com/FFmpeg/FFmpeg.git synced 2024-12-23 12:43:46 +02:00
FFmpeg/libavcodec/mwsc.c
Andreas Rheinhardt 790f793844 avutil/common: Don't auto-include mem.h
There are lots of files that don't need it: The number of object
files that actually need it went down from 2011 to 884 here.

Keep it for external users in order to not cause breakages.

Also improve the other headers a bit while just at it.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
2024-03-31 00:08:43 +01:00

184 lines
5.6 KiB
C

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