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avcodec: add Mandsoft Screen Capture Codec decoder

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Signed-off-by: Paul B Mahol <onemda@gmail.com>
This commit is contained in:
Paul B Mahol 2017-04-15 10:57:07 +02:00
parent fd1443b5dd
commit a96db6be06
8 changed files with 244 additions and 0 deletions
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1
configure vendored
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@ -2471,6 +2471,7 @@ mpeg2video_encoder_select="aandcttables mpegvideoenc h263dsp"
mpeg4_decoder_select="h263_decoder mpeg4video_parser"
mpeg4_encoder_select="h263_encoder"
msa1_decoder_select="mss34dsp"
mscc_decoder_select="zlib"
msmpeg4v1_decoder_select="h263_decoder"
msmpeg4v2_decoder_select="h263_decoder"
msmpeg4v2_encoder_select="h263_encoder"

1
doc/general.texi
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@ -789,6 +789,7 @@ following image formats are supported:
@tab Used in LucasArts games / SMUSH animations.
@item lossless MJPEG @tab X @tab X
@item MagicYUV Video @tab @tab X
@item Mandsoft Screen Capture Codec @tab @tab X
@item Microsoft ATC Screen @tab @tab X
@tab Also known as Microsoft Screen 3.
@item Microsoft Expression Encoder Screen @tab @tab X

1
libavcodec/Makefile
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@ -429,6 +429,7 @@ OBJS-$(CONFIG_MPEG4_MEDIACODEC_DECODER) += mediacodecdec.o
OBJS-$(CONFIG_MPEG4_OMX_ENCODER) += omx.o
OBJS-$(CONFIG_MPL2_DECODER) += mpl2dec.o ass.o
OBJS-$(CONFIG_MSA1_DECODER) += mss3.o
OBJS-$(CONFIG_MSCC_DECODER) += mscc.o
OBJS-$(CONFIG_MSMPEG4V1_DECODER) += msmpeg4dec.o msmpeg4.o msmpeg4data.o
OBJS-$(CONFIG_MSMPEG4V2_DECODER) += msmpeg4dec.o msmpeg4.o msmpeg4data.o
OBJS-$(CONFIG_MSMPEG4V2_ENCODER) += msmpeg4enc.o msmpeg4.o msmpeg4data.o

1
libavcodec/allcodecs.c
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@ -258,6 +258,7 @@ static void register_all(void)
REGISTER_DECODER(MPEG2_CRYSTALHD, mpeg2_crystalhd);
REGISTER_DECODER(MPEG2_QSV, mpeg2_qsv);
REGISTER_DECODER(MSA1, msa1);
REGISTER_DECODER(MSCC, mscc);
REGISTER_DECODER(MSMPEG4V1, msmpeg4v1);
REGISTER_ENCDEC (MSMPEG4V2, msmpeg4v2);
REGISTER_ENCDEC (MSMPEG4V3, msmpeg4v3);

1
libavcodec/avcodec.h
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@ -443,6 +443,7 @@ enum AVCodecID {
AV_CODEC_ID_XPM,
AV_CODEC_ID_AV1,
AV_CODEC_ID_BITPACKED,
AV_CODEC_ID_MSCC,
/* various PCM "codecs" */
AV_CODEC_ID_FIRST_AUDIO = 0x10000, ///< A dummy id pointing at the start of audio codecs

7
libavcodec/codec_desc.c
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@ -1388,6 +1388,13 @@ static const AVCodecDescriptor codec_descriptors[] = {
.long_name = NULL_IF_CONFIG_SMALL("Bitpacked"),
.props = AV_CODEC_PROP_INTRA_ONLY | AV_CODEC_PROP_LOSSLESS,
},
{
.id = AV_CODEC_ID_MSCC,
.type = AVMEDIA_TYPE_VIDEO,
.name = "mscc",
.long_name = NULL_IF_CONFIG_SMALL("Mandsoft Screen Capture Codec"),
.props = AV_CODEC_PROP_INTRA_ONLY | AV_CODEC_PROP_LOSSLESS,
},
/* image codecs */
{

231
libavcodec/mscc.c Normal file
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@ -0,0 +1,231 @@
/*
* Mandsoft Screen Capture Codec decoder
*
* Copyright (c) 2017 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 <stdlib.h>
#include <string.h>
#include "avcodec.h"
#include "bytestream.h"
#include "internal.h"
#include <zlib.h>
typedef struct MSCCContext {
unsigned bpp;
unsigned int decomp_size;
uint8_t *decomp_buf;
unsigned int uncomp_size;
uint8_t *uncomp_buf;
z_stream zstream;
} MSCCContext;
static int rle_uncompress(AVCodecContext *avctx, GetByteContext *gb, PutByteContext *pb, int bpp)
{
while (bytestream2_get_bytes_left(gb) > 0) {
uint32_t fill;
int j;
unsigned run = bytestream2_get_byte(gb);
if (run) {
switch (avctx->bits_per_coded_sample) {
case 8:
fill = bytestream2_get_byte(gb);
break;
case 16:
fill = bytestream2_get_le16(gb);
break;
case 24:
fill = bytestream2_get_le24(gb);
break;
case 32:
fill = bytestream2_get_le32(gb);
break;
}
for (j = 0; j < run; j++) {
switch (avctx->bits_per_coded_sample) {
case 8:
bytestream2_put_byte(pb, fill);
break;
case 16:
bytestream2_put_le16(pb, fill);
break;
case 24:
bytestream2_put_le24(pb, fill);
break;
case 32:
bytestream2_put_le32(pb, fill);
break;
}
}
} else {
unsigned copy = bytestream2_get_byte(gb);
if (copy == 1) {
return 0;
} else if (copy == 2) {
unsigned x, y;
x = bytestream2_get_byte(gb);
y = bytestream2_get_byte(gb);
bytestream2_skip_p(pb, x * bpp);
bytestream2_skip_p(pb, y * bpp * avctx->width);
} else {
for (j = 0; j < copy; j++) {
switch (avctx->bits_per_coded_sample) {
case 8:
bytestream2_put_byte(pb, bytestream2_get_byte(gb));
break;
case 16:
bytestream2_put_le16(pb, bytestream2_get_le16(gb));
break;
case 24:
bytestream2_put_le24(pb, bytestream2_get_le24(gb));
break;
case 32:
bytestream2_put_le32(pb, bytestream2_get_le32(gb));
break;
}
}
}
}
}
return AVERROR_INVALIDDATA;
}
static int decode_frame(AVCodecContext *avctx,
void *data, int *got_frame,
AVPacket *avpkt)
{
MSCCContext *s = avctx->priv_data;
AVFrame *frame = data;
GetByteContext gb;
PutByteContext pb;
int ret, j;
if (avpkt->size < 3)
return AVERROR_INVALIDDATA;
if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
return ret;
avpkt->data[2] ^= avpkt->data[0];
ret = inflateReset(&s->zstream);
if (ret != Z_OK) {
av_log(avctx, AV_LOG_ERROR, "Inflate reset error: %d\n", ret);
return AVERROR_UNKNOWN;
}
s->zstream.next_in = avpkt->data + 2;
s->zstream.avail_in = avpkt->size - 2;
s->zstream.next_out = s->decomp_buf;
s->zstream.avail_out = s->decomp_size;
ret = inflate(&s->zstream, Z_FINISH);
if (ret != Z_STREAM_END) {
av_log(avctx, AV_LOG_ERROR, "Inflate error: %d\n", ret);
return AVERROR_UNKNOWN;
}
bytestream2_init(&gb, s->decomp_buf, s->zstream.total_out);
bytestream2_init_writer(&pb, s->uncomp_buf, s->uncomp_size);
ret = rle_uncompress(avctx, &gb, &pb, s->bpp);
if (ret)
return ret;
for (j = 0; j < avctx->height; j++) {
memcpy(frame->data[0] + (avctx->height - j - 1) * frame->linesize[0],
s->uncomp_buf + s->bpp * j * avctx->width, s->bpp * avctx->width);
}
frame->key_frame = 1;
frame->pict_type = AV_PICTURE_TYPE_I;
*got_frame = 1;
return avpkt->size;
}
static av_cold int decode_init(AVCodecContext *avctx)
{
MSCCContext *s = avctx->priv_data;
int zret;
switch (avctx->bits_per_coded_sample) {
case 8: avctx->pix_fmt = AV_PIX_FMT_GRAY8; break;
case 16: avctx->pix_fmt = AV_PIX_FMT_RGB555; break;
case 24: avctx->pix_fmt = AV_PIX_FMT_BGR24; break;
case 32: avctx->pix_fmt = AV_PIX_FMT_BGRA; break;
default:
av_log(avctx, AV_LOG_ERROR, "Unsupported bitdepth %i\n", avctx->bits_per_coded_sample);
return AVERROR_INVALIDDATA;
}
s->bpp = avctx->bits_per_coded_sample >> 3;
memset(&s->zstream, 0, sizeof(z_stream));
s->decomp_size = 4 * avctx->height * ((avctx->width * avctx->bits_per_coded_sample + 31) / 32);
if (!(s->decomp_buf = av_malloc(s->decomp_size)))
return AVERROR(ENOMEM);
s->uncomp_size = 4 * avctx->height * ((avctx->width * avctx->bits_per_coded_sample + 31) / 32);
if (!(s->uncomp_buf = av_malloc(s->uncomp_size)))
return AVERROR(ENOMEM);
s->zstream.zalloc = Z_NULL;
s->zstream.zfree = Z_NULL;
s->zstream.opaque = Z_NULL;
zret = inflateInit(&s->zstream);
if (zret != Z_OK) {
av_log(avctx, AV_LOG_ERROR, "Inflate init error: %d\n", zret);
return AVERROR_UNKNOWN;
}
return 0;
}
static av_cold int decode_close(AVCodecContext *avctx)
{
MSCCContext *s = avctx->priv_data;
av_freep(&s->decomp_buf);
s->decomp_size = 0;
av_freep(&s->uncomp_buf);
s->uncomp_size = 0;
inflateEnd(&s->zstream);
return 0;
}
AVCodec ff_mscc_decoder = {
.name = "mscc",
.long_name = NULL_IF_CONFIG_SMALL("Mandsoft Screen Capture Codec"),
.type = AVMEDIA_TYPE_VIDEO,
.id = AV_CODEC_ID_MSCC,
.priv_data_size = sizeof(MSCCContext),
.init = decode_init,
.close = decode_close,
.decode = decode_frame,
.capabilities = AV_CODEC_CAP_DR1,
};

1
libavformat/riff.c
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@ -452,6 +452,7 @@ const AVCodecTag ff_codec_bmp_tags[] = {
{ AV_CODEC_ID_SCPR, MKTAG('S', 'C', 'P', 'R') },
{ AV_CODEC_ID_CLEARVIDEO, MKTAG('U', 'C', 'O', 'D') },
{ AV_CODEC_ID_AV1, MKTAG('A', 'V', '0', '1') },
{ AV_CODEC_ID_MSCC, MKTAG('M', 'S', 'C', 'C') },
{ AV_CODEC_ID_NONE, 0 }
};