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| author | Paul B Mahol <onemda@gmail.com> | 2020-02-13 10:11:20 +0100 |
|---|---|---|
| committer | Paul B Mahol <onemda@gmail.com> | 2020-02-13 12:02:30 +0100 |
| commit | 388a221a8ba6f550e8c3a2f8a10e6162d1ce6616 (patch) | |
| tree | 812a07752e566ddbdcd0b0627737b25e0b3f3eeb /libavcodec/midivid.c | |
| parent | 018a42790ce12d19940991a49e26f85e7717159c (diff) | |
avcodec/midivid: improve decoding of widths not multiple of 32
Diffstat (limited to 'libavcodec/midivid.c')
| -rw-r--r-- | libavcodec/midivid.c | 14 |
1 files changed, 8 insertions, 6 deletions
diff --git a/libavcodec/midivid.c b/libavcodec/midivid.c index 8d4c3b369e..afa394fca5 100644 --- a/libavcodec/midivid.c +++ b/libavcodec/midivid.c @@ -59,16 +59,17 @@ static int decode_mvdv(MidiVidContext *s, AVCodecContext *avctx, AVFrame *frame) uint32_t nb_blocks; nb_vectors = bytestream2_get_le16(gb); - intra_flag = bytestream2_get_le16(gb); + intra_flag = !!bytestream2_get_le16(gb); if (intra_flag) { nb_blocks = (avctx->width / 2) * (avctx->height / 2); } else { - int ret, skip_linesize; + int ret, skip_linesize, padding; nb_blocks = bytestream2_get_le32(gb); skip_linesize = avctx->width >> 1; mask_start = gb->buffer_start + bytestream2_tell(gb); - mask_size = (avctx->width >> 5) * (avctx->height >> 2); + mask_size = (FFALIGN(avctx->width, 32) >> 2) * (avctx->height >> 2) >> 3; + padding = (FFALIGN(avctx->width, 32) - avctx->width) >> 2; if (bytestream2_get_bytes_left(gb) < mask_size) return AVERROR_INVALIDDATA; @@ -88,6 +89,7 @@ static int decode_mvdv(MidiVidContext *s, AVCodecContext *avctx, AVFrame *frame) skip[(y*2+1)*skip_linesize + x*2 ] = flag; skip[(y*2+1)*skip_linesize + x*2+1] = flag; } + skip_bits_long(&mask, padding); } } @@ -96,10 +98,10 @@ static int decode_mvdv(MidiVidContext *s, AVCodecContext *avctx, AVFrame *frame) return AVERROR_INVALIDDATA; bytestream2_skip(gb, nb_vectors * 12); if (nb_vectors > 256) { - if (bytestream2_get_bytes_left(gb) < (nb_blocks + 7) / 8) + if (bytestream2_get_bytes_left(gb) < (nb_blocks + 7 * !intra_flag) / 8) return AVERROR_INVALIDDATA; - bytestream2_init(&idx9, gb->buffer_start + bytestream2_tell(gb), (nb_blocks + 7) / 8); - bytestream2_skip(gb, (nb_blocks + 7) / 8); + bytestream2_init(&idx9, gb->buffer_start + bytestream2_tell(gb), (nb_blocks + 7 * !intra_flag) / 8); + bytestream2_skip(gb, (nb_blocks + 7 * !intra_flag) / 8); } skip = s->skip; |