+/*
+ * XSUB subtitle decoder
+ * Copyright (c) 2007 Reimar Döffinger
+ *
+ * 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 "avcodec.h"
#include "bitstream.h"
#include "bytestream.h"
-static int decode_init(AVCodecContext *avctx) {
+static av_cold int decode_init(AVCodecContext *avctx) {
avctx->pix_fmt = PIX_FMT_PAL8;
return 0;
}
static const uint8_t tc_offsets[9] = { 0, 1, 3, 4, 6, 7, 9, 10, 11 };
static const uint8_t tc_muls[9] = { 10, 6, 10, 6, 10, 6, 10, 10, 1 };
-static uint64_t parse_timecode(AVCodecContext *avctx, uint8_t *buf) {
+static uint64_t parse_timecode(const uint8_t *buf) {
int i;
int64_t ms = 0;
if (buf[2] != ':' || buf[5] != ':' || buf[8] != '.')
if (c > 9) return AV_NOPTS_VALUE;
ms = (ms + c) * tc_muls[i];
}
- ms = av_rescale_q(ms, (AVRational){1, 1000}, avctx->time_base);
return ms;
}
-static const uint8_t runbits[8] = { 14, 14, 10, 10, 6, 6, 2, 2 };
-
static int decode_frame(AVCodecContext *avctx, void *data, int *data_size,
- uint8_t *buf, int buf_size) {
+ const uint8_t *buf, int buf_size) {
AVSubtitle *sub = data;
- uint8_t *buf_end = buf + buf_size;
+ const uint8_t *buf_end = buf + buf_size;
uint8_t *bitmap;
int w, h, x, y, rlelen, i;
GetBitContext gb;
av_log(avctx, AV_LOG_ERROR, "invalid time code\n");
return -1;
}
- sub->start_display_time = parse_timecode(avctx, buf + 1);
- sub->end_display_time = parse_timecode(avctx, buf + 14);
+ sub->start_display_time = parse_timecode(buf + 1);
+ sub->end_display_time = parse_timecode(buf + 14);
buf += 27;
// read header
// read palette
for (i = 0; i < sub->rects[0].nb_colors; i++)
sub->rects[0].rgba_palette[i] = bytestream_get_be24(&buf);
+ // make all except background (first entry) non-transparent
+ for (i = 1; i < sub->rects[0].nb_colors; i++)
+ sub->rects[0].rgba_palette[i] |= 0xff000000;
// process RLE-compressed data
rlelen = FFMIN(rlelen, buf_end - buf);
init_get_bits(&gb, buf, rlelen * 8);
bitmap = sub->rects[0].bitmap;
for (y = 0; y < h; y++) {
+ // interlaced: do odd lines
+ if (y == (h + 1) / 2) bitmap = sub->rects[0].bitmap + w;
for (x = 0; x < w; ) {
int log2 = ff_log2_tab[show_bits(&gb, 8)];
- int run = get_bits(&gb, runbits[log2]);
- int colour = get_bits(&gb, 2);
+ int run = get_bits(&gb, 14 - 4 * (log2 >> 1));
+ int color = get_bits(&gb, 2);
run = FFMIN(run, w - x);
// run length 0 means till end of row
if (!run) run = w - x;
- memset(bitmap, colour, run);
+ memset(bitmap, color, run);
bitmap += run;
x += run;
}
+ // interlaced, skip every second line
+ bitmap += w;
align_get_bits(&gb);
}
*data_size = 1;
NULL,
NULL,
decode_frame,
+ .long_name = NULL_IF_CONFIG_SMALL("XSUB"),
};