+/*
+ * XSUB subtitle decoder
+ * Copyright (c) 2007 Reimar Döffinger
+ *
+ * This file is part of Libav.
+ *
+ * Libav 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,
+ * 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
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include "libavutil/mathematics.h"
+#include "libavutil/imgutils.h"
+
#include "avcodec.h"
#include "bitstream.h"
#include "bytestream.h"
-static int decode_init(AVCodecContext *avctx) {
- avctx->pix_fmt = PIX_FMT_PAL8;
+static av_cold int decode_init(AVCodecContext *avctx) {
+ avctx->pix_fmt = AV_PIX_FMT_PAL8;
return 0;
}
-static const uint8_t runbits[8] = { 2, 2, 6, 6, 10, 10, 14, 14 };
+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, 10, 10, 10, 1 };
+
+static int64_t parse_timecode(const uint8_t *buf, int64_t packet_time) {
+ int i;
+ int64_t ms = 0;
+ if (buf[2] != ':' || buf[5] != ':' || buf[8] != '.')
+ return AV_NOPTS_VALUE;
+ for (i = 0; i < sizeof(tc_offsets); i++) {
+ uint8_t c = buf[tc_offsets[i]] - '0';
+ if (c > 9) return AV_NOPTS_VALUE;
+ ms = (ms + c) * tc_muls[i];
+ }
+ return ms - packet_time;
+}
static int decode_frame(AVCodecContext *avctx, void *data, int *data_size,
- uint8_t *buf, int buf_size) {
+ AVPacket *avpkt) {
+ const uint8_t *buf = avpkt->data;
+ int buf_size = avpkt->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;
+ int w, h, x, y, i;
+ int64_t packet_time = 0;
+ BitstreamContext bc;
+ int has_alpha = avctx->codec_tag == MKTAG('D','X','S','A');
+
+ memset(sub, 0, sizeof(*sub));
// check that at least header fits
- if (buf_size < 27 + 7 * 2 + 4 * 3) {
+ if (buf_size < 27 + 7 * 2 + 4 * (3 + has_alpha)) {
av_log(avctx, AV_LOG_ERROR, "coded frame too small\n");
return -1;
}
+ // read start and end time
+ if (buf[0] != '[' || buf[13] != '-' || buf[26] != ']') {
+ av_log(avctx, AV_LOG_ERROR, "invalid time code\n");
+ return -1;
+ }
+ if (avpkt->pts != AV_NOPTS_VALUE)
+ packet_time = av_rescale_q(avpkt->pts, AV_TIME_BASE_Q, (AVRational){1, 1000});
+ sub->start_display_time = parse_timecode(buf + 1, packet_time);
+ sub->end_display_time = parse_timecode(buf + 14, packet_time);
+ buf += 27;
+
// read header
w = bytestream_get_le16(&buf);
h = bytestream_get_le16(&buf);
- if (avcodec_check_dimensions(avctx, w, h) < 0)
+ if (av_image_check_size(w, h, 0, avctx) < 0)
return -1;
x = bytestream_get_le16(&buf);
y = bytestream_get_le16(&buf);
// 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 in which it has a bogus value and thus
+ // we just ignore it
+ bytestream_get_le16(&buf);
// allocate sub and set values
- if (!sub->rects) {
- sub->rects = av_mallocz(sizeof(AVSubtitleRect));
- sub->num_rects = 1;
+ sub->rects = av_mallocz(sizeof(*sub->rects));
+ if (!sub->rects)
+ return AVERROR(ENOMEM);
+ sub->rects[0] = av_mallocz(sizeof(*sub->rects[0]));
+ if (!sub->rects[0]) {
+ av_freep(&sub->rects);
+ return AVERROR(ENOMEM);
+ }
+ sub->num_rects = 1;
+ sub->rects[0]->x = x; sub->rects[0]->y = y;
+ sub->rects[0]->w = w; sub->rects[0]->h = h;
+ sub->rects[0]->type = SUBTITLE_BITMAP;
+ sub->rects[0]->linesize[0] = w;
+ sub->rects[0]->data[0] = av_malloc(w * h);
+ sub->rects[0]->nb_colors = 4;
+ sub->rects[0]->data[1] = av_mallocz(AVPALETTE_SIZE);
+ if (!sub->rects[0]->data[0] || !sub->rects[0]->data[1]) {
+ av_freep(&sub->rects[0]->data[1]);
+ av_freep(&sub->rects[0]->data[0]);
+ av_freep(&sub->rects[0]);
+ av_freep(&sub->rects);
+ return AVERROR(ENOMEM);
}
- av_freep(sub->rects[0].bitmap);
- sub->rects[0].x = x; sub->rects[0].y = y;
- sub->rects[0].w = w; sub->rects[0].h = h;
- sub->rects[0].linesize = w;
- sub->rects[0].bitmap = av_malloc(w * h);
- sub->rects[0].nb_colors = 4;
- sub->rects[0].rgba_palette = av_malloc(sub->rects[0].nb_colors * 4);
// read palette
- for (i = 0; i < sub->rects[0].nb_colors; i++)
- sub->rects[0].rgba_palette[i] = bytestream_get_be24(&buf);
+ for (i = 0; i < sub->rects[0]->nb_colors; i++)
+ ((uint32_t*)sub->rects[0]->data[1])[i] = bytestream_get_be24(&buf);
+
+ if (!has_alpha) {
+ // make all except background (first entry) non-transparent
+ for (i = 1; i < sub->rects[0]->nb_colors; i++)
+ ((uint32_t *)sub->rects[0]->data[1])[i] |= 0xff000000;
+ } else {
+ for (i = 0; i < sub->rects[0]->nb_colors; i++)
+ ((uint32_t *)sub->rects[0]->data[1])[i] |= *buf++ << 24;
+ }
+
+#if FF_API_AVPICTURE
+FF_DISABLE_DEPRECATION_WARNINGS
+{
+ AVSubtitleRect *rect;
+ int j;
+ rect = sub->rects[0];
+ for (j = 0; j < 4; j++) {
+ rect->pict.data[j] = rect->data[j];
+ rect->pict.linesize[j] = rect->linesize[j];
+ }
+}
+FF_ENABLE_DEPRECATION_WARNINGS
+#endif
// process RLE-compressed data
- rlelen = FFMIN(rlelen, buf_end - buf);
- init_get_bits(&gb, buf, rlelen * 8);
- bitmap = sub->rects[0].bitmap;
+ bitstream_init(&bc, buf, (buf_end - buf) * 8);
+ bitmap = sub->rects[0]->data[0];
for (y = 0; y < h; y++) {
+ // interlaced: do odd lines
+ if (y == (h + 1) / 2) bitmap = sub->rects[0]->data[0] + 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 log2 = ff_log2_tab[bitstream_peek(&bc, 8)];
+ int run = bitstream_read(&bc, 14 - 4 * (log2 >> 1));
+ int color = bitstream_read(&bc, 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;
}
- align_get_bits(&gb);
+ // interlaced, skip every second line
+ bitmap += w;
+ bitstream_align(&bc);
}
*data_size = 1;
return buf_size;
}
-AVCodec xsub_decoder = {
- "xsub",
- CODEC_TYPE_SUBTITLE,
- CODEC_ID_XSUB,
- 0,
- decode_init,
- NULL,
- NULL,
- decode_frame,
+AVCodec ff_xsub_decoder = {
+ .name = "xsub",
+ .long_name = NULL_IF_CONFIG_SMALL("XSUB"),
+ .type = AVMEDIA_TYPE_SUBTITLE,
+ .id = AV_CODEC_ID_XSUB,
+ .init = decode_init,
+ .decode = decode_frame,
};
projects / ffmpeg / blobdiff