commit 8e52e49146c123b5814ef4abb822842a3aa0869f
Author: Eejya <singh.eejya@gmail.com>
Date:   Fri Oct 3 01:43:20 2014 +0530

    WIP

diff --git a/libavformat/Makefile b/libavformat/Makefile
index 86064ea..60e056d 100644
--- a/libavformat/Makefile
+++ b/libavformat/Makefile
@@ -433,6 +433,7 @@ OBJS-$(CONFIG_VOBSUB_DEMUXER)            += subtitles.o # mpeg demuxer is in the
 OBJS-$(CONFIG_VOC_DEMUXER)               += vocdec.o voc.o
 OBJS-$(CONFIG_VOC_MUXER)                 += vocenc.o voc.o
 OBJS-$(CONFIG_VPLAYER_DEMUXER)           += vplayerdec.o subtitles.o
+OBJS-$(CONFIG_STL_DEMUXER)           	 += stldec.o subtitles.o
 OBJS-$(CONFIG_VQF_DEMUXER)               += vqf.o
 OBJS-$(CONFIG_W64_DEMUXER)               += wavdec.o w64.o pcm.o
 OBJS-$(CONFIG_W64_MUXER)                 += wavenc.o w64.o
diff --git a/libavformat/allformats.c b/libavformat/allformats.c
index d54ed9b..c1a3a4e 100644
--- a/libavformat/allformats.c
+++ b/libavformat/allformats.c
@@ -258,6 +258,7 @@ void av_register_all(void)
     REGISTER_DEMUXER (SBG,              sbg);
     REGISTER_DEMUXER (SDP,              sdp);
     REGISTER_DEMUXER (SDR2,             sdr2);
+    REGISTER_DEMUXER (STL,              stl);
 #if CONFIG_RTPDEC
     ff_register_rtp_dynamic_payload_handlers();
     ff_register_rdt_dynamic_payload_handlers();
diff --git a/libavformat/stldec.c b/libavformat/stldec.c
new file mode 100644
index 0000000..24ae5bd
--- /dev/null
+++ b/libavformat/stldec.c
@@ -0,0 +1,171 @@
+#include "avformat.h"
+#include "internal.h"
+#include "subtitles.h"
+#include "libavutil/bprint.h"
+#include "libavutil/intreadwrite.h"
+
+typedef struct {
+    FFDemuxSubtitlesQueue q;
+} STLContext;
+
+static int stl_probe(AVProbeData *p)
+{
+    char c;
+    const unsigned char *ptr = p->buf;
+    if (sscanf(ptr, "%*d:%*d:%*d:%*d , %*d:%*d:%*d:%*d ,", &c) == 1)
+        return AVPROBE_SCORE_MAX;
+    return 0;
+}
+static int64_t get_pts(const char **buf, int *duration,
+                       int32_t *x1, int32_t *y1, int32_t *x2, int32_t *y2)
+{
+        int hh1, mm1, ss1, ms1;
+        int hh2, mm2, ss2, ms2;
+        if (sscanf(*buf, "%2d:%2d:%2d:%2d , %2d:%2d:%2d:%2d , ",
+                   &hh1, &mm1, &ss1, &ms1,
+                   &hh2, &mm2, &ss2, &ms2) >= 6) {
+            int64_t start = (hh1*3600LL + mm1*60LL + ss1) * 100LL + ms1;
+            int64_t end   = (hh2*3600LL + mm2*60LL + ss2) * 100LL + ms2;
+            *duration = end - start;
+            *buf += ff_subtitles_next_line(*buf);
+            return start;
+        }
+        *buf += ff_subtitles_next_line(*buf);
+
+    return AV_NOPTS_VALUE;
+}
+
+static int stl_read_header(AVFormatContext *s)
+{
+    STLContext *stl = s->priv_data;
+    AVBPrint buf;
+    AVStream *st = avformat_new_stream(s, NULL);
+    int res = 0;
+    FFTextReader tr;
+    ff_text_init_avio(&tr, s->pb);
+
+    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_TEXT;
+
+    av_bprint_init(&buf, 0, AV_BPRINT_SIZE_UNLIMITED);
+
+    while (!ff_text_eof(&tr)) {
+        ff_subtitles_read_text_chunk(&tr, &buf);
+
+        if (buf.len) {
+            int64_t pos = ff_text_pos(&tr);
+            int64_t pts;
+            int duration;
+            const char *ptr = buf.str;
+            int32_t x1 = -1, y1 = -1, x2 = -1, y2 = -1;
+            AVPacket *sub;
+
+            pts = get_pts(&ptr, &duration, &x1, &y1, &x2, &y2);
+            if (pts != AV_NOPTS_VALUE) {
+                int len = buf.len - (ptr - buf.str);
+                if (len <= 0)
+                    continue;
+                sub = ff_subtitles_queue_insert(&stl->q, ptr, len, 0);
+                if (!sub) {
+                    res = AVERROR(ENOMEM);
+                    goto end;
+                }
+                sub->pos = pos;
+                sub->pts = pts;
+                sub->duration = duration;
+                if (x1 != -1) {
+                    uint8_t *p = av_packet_new_side_data(sub, AV_PKT_DATA_SUBTITLE_POSITION, 16);
+                    if (p) {
+                        AV_WL32(p,      x1);
+                        AV_WL32(p +  4, y1);
+                        AV_WL32(p +  8, x2);
+                        AV_WL32(p + 12, y2);
+                    }
+                }
+            }
+        }
+    }
+
+    ff_subtitles_queue_finalize(&stl->q);
+
+end:
+    av_bprint_finalize(&buf, NULL);
+    return res;
+}
+
+/*static int stl_read_header(AVFormatContext *s)
+{
+    STLContext *stl = s->priv_data;
+    AVStream *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_TEXT;
+
+    while (!avio_feof(s->pb)) {
+        char line[4096];
+        char *p = line;
+
+        const int64_t pos = avio_tell(s->pb);
+        int len = ff_get_line(s->pb, line, sizeof(line));
+        int64_t pts_start;
+
+        if (!len)
+            break;
+
+        line[strcspn(line, "\r\n")] = 0;
+
+        pts_start = read_ts(&p);
+        if (pts_start != AV_NOPTS_VALUE) {
+            AVPacket *sub;
+
+            sub = ff_subtitles_queue_insert(&stl->q, p, strlen(p), 0);
+            if (!sub)
+                return AVERROR(ENOMEM);
+            sub->pos = pos;
+            sub->pts = pts_start;
+            sub->duration = -1;
+        }
+    }
+
+    ff_subtitles_queue_finalize(&stl->q);
+    return 0;
+}
+*/
+static int stl_read_packet(AVFormatContext *s, AVPacket *pkt)
+{
+    STLContext *stl = s->priv_data;
+    return ff_subtitles_queue_read_packet(&stl->q, pkt);
+}
+
+static int stl_read_seek(AVFormatContext *s, int stream_index,
+                             int64_t min_ts, int64_t ts, int64_t max_ts, int flags)
+{
+    STLContext *stl = s->priv_data;
+    return ff_subtitles_queue_seek(&stl->q, s, stream_index,
+                                   min_ts, ts, max_ts, flags);
+}
+
+static int stl_read_close(AVFormatContext *s)
+{
+    STLContext *stl = s->priv_data;
+    ff_subtitles_queue_clean(&stl->q);
+    return 0;
+}
+
+AVInputFormat ff_stl_demuxer = {
+    .name           = "stl",
+    .long_name      = NULL_IF_CONFIG_SMALL("STL subtitles"),
+    .priv_data_size = sizeof(STLContext),
+    .read_probe     = stl_probe,
+    .read_header    = stl_read_header,
+    .read_packet    = stl_read_packet,
+    .read_seek2     = stl_read_seek,
+    .read_close     = stl_read_close,
+    .extensions     = "stl",
+};