making act segmenter

1 files changed, 169 insertions, 0 deletions

diff --git a/ffmpeg/libavformat/assdec.c b/ffmpeg/libavformat/assdec.c
new file mode 100644
index 0000000..35fcb51
--- /dev/null
+++ b/ffmpeg/libavformat/assdec.c
@@ -0,0 +1,169 @@
+/*
+ * SSA/ASS demuxer
+ * Copyright (c) 2008 Michael Niedermayer
+ *
+ * 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 "avformat.h"
+#include "internal.h"
+#include "subtitles.h"
+#include "libavcodec/internal.h"
+#include "libavutil/bprint.h"
+
+typedef struct ASSContext{
+    FFDemuxSubtitlesQueue q;
+}ASSContext;
+
+static int ass_probe(AVProbeData *p)
+{
+    const char *header= "[Script Info]";
+
+    if(   !memcmp(p->buf  , header, strlen(header))
+       || !memcmp(p->buf+3, header, strlen(header)))
+        return AVPROBE_SCORE_MAX;
+
+    return 0;
+}
+
+static int ass_read_close(AVFormatContext *s)
+{
+    ASSContext *ass = s->priv_data;
+    ff_subtitles_queue_clean(&ass->q);
+    return 0;
+}
+
+static int read_ts(const uint8_t *p, int64_t *start, int *duration)
+{
+    int64_t end;
+    int hh1, mm1, ss1, ms1;
+    int hh2, mm2, ss2, ms2;
+
+    if (sscanf(p, "%*[^,],%d:%d:%d%*c%d,%d:%d:%d%*c%d",
+               &hh1, &mm1, &ss1, &ms1,
+               &hh2, &mm2, &ss2, &ms2) == 8) {
+        end    = (hh2*3600LL + mm2*60LL + ss2) * 100LL + ms2;
+        *start = (hh1*3600LL + mm1*60LL + ss1) * 100LL + ms1;
+        *duration = end - *start;
+        return 0;
+    }
+    return -1;
+}
+
+static int64_t get_line(AVBPrint *buf, AVIOContext *pb)
+{
+    int64_t pos = avio_tell(pb);
+
+    av_bprint_clear(buf);
+    for (;;) {
+        char c = avio_r8(pb);
+        if (!c)
+            break;
+        av_bprint_chars(buf, c, 1);
+        if (c == '\n')
+            break;
+    }
+    return pos;
+}
+
+static int ass_read_header(AVFormatContext *s)
+{
+    ASSContext *ass = s->priv_data;
+    AVBPrint header, line;
+    int header_remaining, res = 0;
+    AVStream *st;
+
+    st = avformat_new_stream(s, NULL);
+    if (!st)
+        return AVERROR(ENOMEM);
+    avpriv_set_pts_info(st, 64, 1, 100);
+    st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
+    st->codec->codec_id= AV_CODEC_ID_SSA;
+
+    header_remaining= INT_MAX;
+
+    av_bprint_init(&header, 0, AV_BPRINT_SIZE_UNLIMITED);
+    av_bprint_init(&line,   0, AV_BPRINT_SIZE_UNLIMITED);
+
+    for (;;) {
+        int64_t pos = get_line(&line, s->pb);
+
+        if (!line.str[0]) // EOF
+            break;
+
+        if (!memcmp(line.str, "[Events]", 8))
+            header_remaining= 2;
+        else if (line.str[0]=='[')
+            header_remaining= INT_MAX;
+
+        if (header_remaining) {
+            av_bprintf(&header, "%s", line.str);
+            header_remaining--;
+        } else {
+            int64_t ts_start = AV_NOPTS_VALUE;
+            int duration = -1;
+            AVPacket *sub;
+
+            if (read_ts(line.str, &ts_start, &duration) < 0)
+                continue;
+            sub = ff_subtitles_queue_insert(&ass->q, line.str, line.len, 0);
+            if (!sub) {
+                res = AVERROR(ENOMEM);
+                goto end;
+            }
+            sub->pos = pos;
+            sub->pts = ts_start;
+            sub->duration = duration;
+        }
+    }
+
+    av_bprint_finalize(&line, NULL);
+
+    res = avpriv_bprint_to_extradata(st->codec, &header);
+    if (res < 0)
+        goto end;
+
+    ff_subtitles_queue_finalize(&ass->q);
+
+end:
+    return res;
+}
+
+static int ass_read_packet(AVFormatContext *s, AVPacket *pkt)
+{
+    ASSContext *ass = s->priv_data;
+    return ff_subtitles_queue_read_packet(&ass->q, pkt);
+}
+
+static int ass_read_seek(AVFormatContext *s, int stream_index,
+                         int64_t min_ts, int64_t ts, int64_t max_ts, int flags)
+{
+    ASSContext *ass = s->priv_data;
+    return ff_subtitles_queue_seek(&ass->q, s, stream_index,
+                                   min_ts, ts, max_ts, flags);
+}
+
+AVInputFormat ff_ass_demuxer = {
+    .name           = "ass",
+    .long_name      = NULL_IF_CONFIG_SMALL("SSA (SubStation Alpha) subtitle"),
+    .priv_data_size = sizeof(ASSContext),
+    .read_probe     = ass_probe,
+    .read_header    = ass_read_header,
+    .read_packet    = ass_read_packet,
+    .read_close     = ass_read_close,
+    .read_seek2     = ass_read_seek,
+};