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vmd: decode videos with no LZ buffer size provided - they might not need it

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The buffer is used for an additional pass of frame compression, so videos
can be coded without ever using it (and some are coded so indeed, e.g. in
Woodruff and the Schnibble of Azimuth game).
This commit is contained in:
Kostya Shishkov 2013-06-01 19:24:26 +02:00
parent 0aed0bfc62
commit 31980b6abd
1 changed files with 10 additions and 3 deletions
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13
libavcodec/vmdav.c
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@ -278,6 +278,11 @@ static int vmd_decode(VmdVideoContext *s, AVFrame *frame)
return AVERROR_INVALIDDATA;
meth = bytestream2_get_byteu(&gb);
if (meth & 0x80) {
if (!s->unpack_buffer_size) {
av_log(s->avctx, AV_LOG_ERROR,
"Trying to unpack LZ-compressed frame with no LZ buffer\n");
return AVERROR_INVALIDDATA;
}
lz_unpack(gb.buffer, bytestream2_get_bytes_left(&gb),
s->unpack_buffer, s->unpack_buffer_size);
meth &= 0x7F;
@ -389,9 +394,11 @@ static av_cold int vmdvideo_decode_init(AVCodecContext *avctx)
vmd_header = (unsigned char *)avctx->extradata;
s->unpack_buffer_size = AV_RL32(&vmd_header[800]);
s->unpack_buffer = av_malloc(s->unpack_buffer_size);
if (!s->unpack_buffer)
return -1;
if (s->unpack_buffer_size) {
s->unpack_buffer = av_malloc(s->unpack_buffer_size);
if (!s->unpack_buffer)
return AVERROR(ENOMEM);
}
/* load up the initial palette */
raw_palette = &vmd_header[28];