diff options
Diffstat (limited to 'libavcodec/xsubdec.c')
| -rw-r--r-- | libavcodec/xsubdec.c | 26 |
1 files changed, 14 insertions, 12 deletions
diff --git a/libavcodec/xsubdec.c b/libavcodec/xsubdec.c index 097cbc6c1d..9289a2554e 100644 --- a/libavcodec/xsubdec.c +++ b/libavcodec/xsubdec.c @@ -2,20 +2,20 @@ * XSUB subtitle decoder * Copyright (c) 2007 Reimar Döffinger * - * This file is part of Libav. + * This file is part of FFmpeg. * - * Libav is free software; you can redistribute it and/or + * 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. * - * Libav is distributed in the hope that it will be useful, + * 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 Libav; if not, write to the Free Software + * License along with FFmpeg; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ #include "libavutil/imgutils.h" @@ -51,11 +51,10 @@ static int decode_frame(AVCodecContext *avctx, void *data, int *data_size, AVSubtitle *sub = data; const uint8_t *buf_end = buf + buf_size; uint8_t *bitmap; - int w, h, x, y, rlelen, i; + int w, h, x, y, i; int64_t packet_time = 0; GetBitContext gb; - - memset(sub, 0, sizeof(*sub)); + int has_alpha = avctx->codec_tag == MKTAG('D','X','S','A'); // check that at least header fits if (buf_size < 27 + 7 * 2 + 4 * 3) { @@ -84,7 +83,11 @@ static int decode_frame(AVCodecContext *avctx, void *data, int *data_size, // skip bottom right position, it gives no new information bytestream_get_le16(&buf); bytestream_get_le16(&buf); - rlelen = bytestream_get_le16(&buf); + // The following value is supposed to indicate the start offset + // (relative to the palette) of the data for the second field, + // however there are files where it has a bogus value and thus + // we just ignore it + bytestream_get_le16(&buf); // allocate sub and set values sub->rects = av_mallocz(sizeof(*sub->rects)); @@ -102,12 +105,11 @@ static int decode_frame(AVCodecContext *avctx, void *data, int *data_size, for (i = 0; i < sub->rects[0]->nb_colors; i++) ((uint32_t*)sub->rects[0]->pict.data[1])[i] = bytestream_get_be24(&buf); // make all except background (first entry) non-transparent - for (i = 1; i < sub->rects[0]->nb_colors; i++) - ((uint32_t*)sub->rects[0]->pict.data[1])[i] |= 0xff000000; + for (i = 0; i < sub->rects[0]->nb_colors; i++) + ((uint32_t*)sub->rects[0]->pict.data[1])[i] |= (has_alpha ? *buf++ : (i ? 0xff : 0)) << 24; // process RLE-compressed data - rlelen = FFMIN(rlelen, buf_end - buf); - init_get_bits(&gb, buf, rlelen * 8); + init_get_bits(&gb, buf, (buf_end - buf) * 8); bitmap = sub->rects[0]->pict.data[0]; for (y = 0; y < h; y++) { // interlaced: do odd lines |