making act segmenter

1 files changed, 145 insertions, 0 deletions

diff --git a/ffmpeg/libavcodec/xsubdec.c b/ffmpeg/libavcodec/xsubdec.c
new file mode 100644
index 0000000..d3367b0
--- /dev/null
+++ b/ffmpeg/libavcodec/xsubdec.c
@@ -0,0 +1,145 @@
+/*
+ * 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 "libavutil/mathematics.h"
+#include "libavutil/imgutils.h"
+#include "avcodec.h"
+#include "get_bits.h"
+#include "bytestream.h"
+
+static av_cold int decode_init(AVCodecContext *avctx) {
+    avctx->pix_fmt = AV_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, 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,
+                        AVPacket *avpkt) {
+    const uint8_t *buf = avpkt->data;
+    int buf_size = avpkt->size;
+    AVSubtitle *sub = data;
+    const uint8_t *buf_end = buf + buf_size;
+    uint8_t *bitmap;
+    int w, h, x, y, i;
+    int64_t packet_time = 0;
+    GetBitContext gb;
+    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) {
+        av_log(avctx, AV_LOG_ERROR, "coded frame size %d too small\n", buf_size);
+        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 (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);
+    // 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
+    sub->rects =  av_mallocz(sizeof(*sub->rects));
+    sub->rects[0] = av_mallocz(sizeof(*sub->rects[0]));
+    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]->pict.linesize[0] = w;
+    sub->rects[0]->pict.data[0] = av_malloc(w * h);
+    sub->rects[0]->nb_colors = 4;
+    sub->rects[0]->pict.data[1] = av_mallocz(AVPALETTE_SIZE);
+
+    // read palette
+    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 = 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
+    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
+        if (y == (h + 1) / 2) bitmap = sub->rects[0]->pict.data[0] + w;
+        for (x = 0; x < w; ) {
+            int log2 = ff_log2_tab[show_bits(&gb, 8)];
+            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, color, run);
+            bitmap += run;
+            x += run;
+        }
+        // interlaced, skip every second line
+        bitmap += w;
+        align_get_bits(&gb);
+    }
+    *data_size = 1;
+    return buf_size;
+}
+
+AVCodec ff_xsub_decoder = {
+    .name      = "xsub",
+    .type      = AVMEDIA_TYPE_SUBTITLE,
+    .id        = AV_CODEC_ID_XSUB,
+    .init      = decode_init,
+    .decode    = decode_frame,
+    .long_name = NULL_IF_CONFIG_SMALL("XSUB"),
+};