On 8/24/2018 3:48 PM, Paul B Mahol wrote:
> Signed-off-by: Paul B Mahol <one...@gmail.com>
> ---
> libavcodec/Makefile | 1 +
> libavcodec/allcodecs.c | 1 +
> libavcodec/avcodec.h | 1 +
> libavcodec/codec_desc.c | 7 ++
> libavcodec/mwsc.c | 174 ++++++++++++++++++++++++++++++++++++++++
> libavformat/riff.c | 1 +
> 6 files changed, 185 insertions(+)
> create mode 100644 libavcodec/mwsc.c
>
> diff --git a/libavcodec/Makefile b/libavcodec/Makefile
> index 9a309c348e..aee4f5431a 100644
> --- a/libavcodec/Makefile
> +++ b/libavcodec/Makefile
> @@ -482,6 +482,7 @@ OBJS-$(CONFIG_MSZH_DECODER) += lcldec.o
> OBJS-$(CONFIG_MTS2_DECODER) += mss4.o
> OBJS-$(CONFIG_MVC1_DECODER) += mvcdec.o
> OBJS-$(CONFIG_MVC2_DECODER) += mvcdec.o
> +OBJS-$(CONFIG_MWSC_DECODER) += mwsc.o
> OBJS-$(CONFIG_MXPEG_DECODER) += mxpegdec.o
> OBJS-$(CONFIG_NELLYMOSER_DECODER) += nellymoserdec.o nellymoser.o
> OBJS-$(CONFIG_NELLYMOSER_ENCODER) += nellymoserenc.o nellymoser.o
> diff --git a/libavcodec/allcodecs.c b/libavcodec/allcodecs.c
> index b1d1ef26c0..d41868c591 100644
> --- a/libavcodec/allcodecs.c
> +++ b/libavcodec/allcodecs.c
> @@ -212,6 +212,7 @@ extern AVCodec ff_mszh_decoder;
> extern AVCodec ff_mts2_decoder;
> extern AVCodec ff_mvc1_decoder;
> extern AVCodec ff_mvc2_decoder;
> +extern AVCodec ff_mwsc_decoder;
> extern AVCodec ff_mxpeg_decoder;
> extern AVCodec ff_nuv_decoder;
> extern AVCodec ff_paf_video_decoder;
> diff --git a/libavcodec/avcodec.h b/libavcodec/avcodec.h
> index 2a4be2ca4f..b327284449 100644
> --- a/libavcodec/avcodec.h
> +++ b/libavcodec/avcodec.h
> @@ -449,6 +449,7 @@ enum AVCodecID {
> AV_CODEC_ID_FITS,
> AV_CODEC_ID_IMM4,
> AV_CODEC_ID_PROSUMER,
> + AV_CODEC_ID_MWSC,
>
> /* various PCM "codecs" */
> AV_CODEC_ID_FIRST_AUDIO = 0x10000, ///< A dummy id pointing at the
> start of audio codecs
> diff --git a/libavcodec/codec_desc.c b/libavcodec/codec_desc.c
> index e611183599..129d0f1aac 100644
> --- a/libavcodec/codec_desc.c
> +++ b/libavcodec/codec_desc.c
> @@ -1668,6 +1668,13 @@ static const AVCodecDescriptor codec_descriptors[] = {
> .long_name = NULL_IF_CONFIG_SMALL("Brooktree ProSumer Video"),
> .props = AV_CODEC_PROP_INTRA_ONLY | AV_CODEC_PROP_LOSSY,
> },
> + {
> + .id = AV_CODEC_ID_MWSC,
> + .type = AVMEDIA_TYPE_VIDEO,
> + .name = "mwsc",
> + .long_name = NULL_IF_CONFIG_SMALL("MatchWare Screen Capture Codec"),
> + .props = AV_CODEC_PROP_LOSSLESS,
> + },
>
> /* various PCM "codecs" */
> {
> diff --git a/libavcodec/mwsc.c b/libavcodec/mwsc.c
> new file mode 100644
> index 0000000000..5ae8330500
> --- /dev/null
> +++ b/libavcodec/mwsc.c
> @@ -0,0 +1,174 @@
> +/*
> + * 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 <stdlib.h>
> +#include <string.h>
> +
> +#include "avcodec.h"
> +#include "bytestream.h"
> +#include "internal.h"
> +
> +#include <zlib.h>
Needs a zlib dependency in configure, then.
> +
> +typedef struct MWSCContext {
> + unsigned bpp;
> + unsigned int decomp_size;
> + uint8_t *decomp_buf;
> + unsigned int uncomp_size;
> + uint8_t *uncomp_buf;
> + z_stream zstream;
> +} MWSCContext;
> +
> +static int rle_uncompress(AVCodecContext *avctx, GetByteContext *gb,
> PutByteContext *pb, int bpp)
> +{
> + int intra = 1;
> +
> + while (bytestream2_get_bytes_left(gb) > 0) {
> + uint32_t fill = bytestream2_get_le24(gb);
> + unsigned run = bytestream2_get_byte(gb);
> + int j;
> +
> + if (run == 0) {
> + run = bytestream2_get_le32(gb);
> + for (j = 0; j < run; j++) {
> + bytestream2_put_le24(pb, fill);
> + }
> + } else if (run == 255) {
> + bytestream2_skip_p(pb, fill * 3);
> + intra = 0;
> + } else {
> + for (j = 0; j < run; j++) {
> + bytestream2_put_le24(pb, fill);
> + }
> + }
> + }
> +
> + return intra;
> +}
> +
> +static int decode_frame(AVCodecContext *avctx,
> + void *data, int *got_frame,
> + AVPacket *avpkt)
> +{
> + MWSCContext *s = avctx->priv_data;
> + AVFrame *frame = data;
> + uint8_t *buf = avpkt->data;
> + int buf_size = avpkt->size;
> + GetByteContext gb;
> + PutByteContext pb;
> + int ret, j;
> +
> + ret = inflateReset(&s->zstream);
> + if (ret != Z_OK) {
> + av_log(avctx, AV_LOG_ERROR, "Inflate reset error: %d\n", ret);
> + return AVERROR_UNKNOWN;
AVERROR_EXTERNAL. Same for all the cases below.
> + }
> + s->zstream.next_in = buf;
> + s->zstream.avail_in = buf_size;
> + 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);
> +
> + frame->key_frame = rle_uncompress(avctx, &gb, &pb, s->bpp);
> +
> + if ((ret = ff_reget_buffer(avctx, frame)) < 0)
> + 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->pict_type = frame->key_frame ? AV_PICTURE_TYPE_I :
> AV_PICTURE_TYPE_P;
> +
> + *got_frame = 1;
> +
> + return avpkt->size;
> +}
> +
> +static av_cold int decode_init(AVCodecContext *avctx)
> +{
> + MWSCContext *s = avctx->priv_data;
> + int zret;
> +
> + switch (avctx->bits_per_coded_sample) {
> + case 24: avctx->pix_fmt = AV_PIX_FMT_BGR24; break;
> + default:
> + av_log(avctx, AV_LOG_ERROR, "Unsupported bitdepth %i\n",
> avctx->bits_per_coded_sample);
Why %i?
> + return AVERROR_INVALIDDATA;
> + }
> +
> + s->bpp = avctx->bits_per_coded_sample >> 3;
> + memset(&s->zstream, 0, sizeof(z_stream));
It's already zeroed.
> +
> + s->decomp_size = 8 * avctx->height * ((avctx->width *
> avctx->bits_per_coded_sample + 31) / 32);
avctx->height and avctx->width are not checked for sane values. And even
then, couldn't this overflow?
> + 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);
Same.
> + 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)
> +{
> + MWSCContext *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_mwsc_decoder = {
> + .name = "mwsc",
> + .long_name = NULL_IF_CONFIG_SMALL("MatchWare Screen Capture
> Codec"),
> + .type = AVMEDIA_TYPE_VIDEO,
> + .id = AV_CODEC_ID_MWSC,
> + .priv_data_size = sizeof(MWSCContext),
> + .init = decode_init,
> + .close = decode_close,
> + .decode = decode_frame,
> + .capabilities = AV_CODEC_CAP_DR1,
FF_CODEC_CAP_INIT_THREADSAFE and FF_CODEC_CAP_INIT_CLEANUP in
AVCodec.caps_internal?
> +};
> diff --git a/libavformat/riff.c b/libavformat/riff.c
> index cf27d0dfd5..aef3c047ac 100644
> --- a/libavformat/riff.c
> +++ b/libavformat/riff.c
> @@ -472,6 +472,7 @@ const AVCodecTag ff_codec_bmp_tags[] = {
> { AV_CODEC_ID_SRGC, MKTAG('S', 'R', 'G', 'C') },
> { AV_CODEC_ID_IMM4, MKTAG('I', 'M', 'M', '4') },
> { AV_CODEC_ID_PROSUMER, MKTAG('B', 'T', '2', '0') },
> + { AV_CODEC_ID_MWSC, MKTAG('M', 'W', 'S', 'C') },
> { AV_CODEC_ID_NONE, 0 }
> };
>
>
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