X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=libavformat%2Fassdec.c;h=bb1f525616c571a399c8327715c50e5f01337fda;hb=e30b3e59a4f3004337cb1623b2aac988ce52b93f;hp=5f8e0b96bebdc62f50750c2dcde20a368755f6b3;hpb=cc947f04cc16033d651fda5aab91e4a3c4b6bd4d;p=ffmpeg

diff --git a/libavformat/assdec.c b/libavformat/assdec.c
index 5f8e0b96beb..bb1f525616c 100644
--- a/libavformat/assdec.c
+++ b/libavformat/assdec.c
@@ -2,24 +2,26 @@
  * SSA/ASS demuxer
  * Copyright (c) 2008 Michael Niedermayer
  *
- * This file is part of FFmpeg.
+ * This file is part of Libav.
  *
- * FFmpeg is free software; you can redistribute it and/or
+ * 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.
  *
- * FFmpeg is distributed in the hope that it will be useful,
+ * 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 FFmpeg; if not, write to the Free Software
+ * 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 "avformat.h"
+#include "internal.h"
 
 #define MAX_LINESIZE 2000
 
@@ -30,20 +32,6 @@ typedef struct ASSContext{
     unsigned int event_index;
 }ASSContext;
 
-static void get_line(ByteIOContext *s, char *buf, int maxlen)
-{
-    int i = 0;
-    char c;
-
-    do{
-        c = get_byte(s);
-        if (i < maxlen-1)
-            buf[i++] = c;
-    }while(c != '\n' && c);
-
-    buf[i] = 0;
-}
-
 static int probe(AVProbeData *p)
 {
     const char *header= "[Script Info]";
@@ -85,30 +73,30 @@ static int event_cmp(uint8_t **a, uint8_t **b)
     return get_pts(*a) - get_pts(*b);
 }
 
-static int read_header(AVFormatContext *s, AVFormatParameters *ap)
+static int read_header(AVFormatContext *s)
 {
-    int i, header_remaining;
+    int i, len, header_remaining;
     ASSContext *ass = s->priv_data;
-    ByteIOContext *pb = s->pb;
+    AVIOContext *pb = s->pb;
     AVStream *st;
     int allocated[2]={0};
     uint8_t *p, **dst[2]={0};
     int pos[2]={0};
 
-    st = av_new_stream(s, 0);
+    st = avformat_new_stream(s, NULL);
     if (!st)
         return -1;
-    av_set_pts_info(st, 64, 1, 100);
+    avpriv_set_pts_info(st, 64, 1, 100);
     st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
     st->codec->codec_id= CODEC_ID_SSA;
 
     header_remaining= INT_MAX;
     dst[0] = &st->codec->extradata;
     dst[1] = &ass->event_buffer;
-    while(!url_feof(pb)){
+    while(!pb->eof_reached){
         uint8_t line[MAX_LINESIZE];
 
-        get_line(pb, line, sizeof(line));
+        len = ff_get_line(pb, line, sizeof(line));
 
         if(!memcmp(line, "[Events]", 8))
             header_remaining= 2;
@@ -124,8 +112,8 @@ static int read_header(AVFormatContext *s, AVFormatParameters *ap)
         if(!p)
             goto fail;
         *(dst[i])= p;
-        memcpy(p + pos[i], line, strlen(line)+1);
-        pos[i] += strlen(line);
+        memcpy(p + pos[i], line, len+1);
+        pos[i] += len;
         if(i) ass->event_count++;
         else  header_remaining--;
     }
@@ -175,13 +163,53 @@ static int read_packet(AVFormatContext *s, AVPacket *pkt)
     return 0;
 }
 
-AVInputFormat ass_demuxer = {
-    "ass",
-    NULL_IF_CONFIG_SMALL("SSA/ASS format"),
-    sizeof(ASSContext),
-    probe,
-    read_header,
-    read_packet,
-    read_close,
-//    read_seek,
+static int read_seek2(AVFormatContext *s, int stream_index,
+                      int64_t min_ts, int64_t ts, int64_t max_ts, int flags)
+{
+    ASSContext *ass = s->priv_data;
+
+    if (flags & AVSEEK_FLAG_BYTE) {
+        return AVERROR(ENOSYS);
+    } else if (flags & AVSEEK_FLAG_FRAME) {
+        if (ts < 0 || ts >= ass->event_count)
+            return AVERROR(ERANGE);
+        ass->event_index = ts;
+    } else {
+        int i, idx = -1;
+        int64_t min_ts_diff = INT64_MAX;
+        if (stream_index == -1) {
+            AVRational time_base = s->streams[0]->time_base;
+            ts = av_rescale_q(ts, AV_TIME_BASE_Q, time_base);
+            min_ts = av_rescale_rnd(min_ts, time_base.den,
+                                    time_base.num * (int64_t)AV_TIME_BASE,
+                                    AV_ROUND_UP);
+            max_ts = av_rescale_rnd(max_ts, time_base.den,
+                                    time_base.num * (int64_t)AV_TIME_BASE,
+                                    AV_ROUND_DOWN);
+        }
+        /* TODO: ass->event[] is sorted by pts so we could do a binary search */
+        for (i=0; i<ass->event_count; i++) {
+            int64_t pts = get_pts(ass->event[i]);
+            int64_t ts_diff = FFABS(pts - ts);
+            if (pts >= min_ts && pts <= max_ts && ts_diff < min_ts_diff) {
+                min_ts_diff = ts_diff;
+                idx = i;
+            }
+        }
+        if (idx < 0)
+            return AVERROR(ERANGE);
+        ass->event_index = idx;
+    }
+    return 0;
+}
+
+AVInputFormat ff_ass_demuxer = {
+    .name           = "ass",
+    .long_name      = NULL_IF_CONFIG_SMALL("Advanced SubStation Alpha subtitle format"),
+    .priv_data_size = sizeof(ASSContext),
+    .read_probe     = probe,
+    .read_header    = read_header,
+    .read_packet    = read_packet,
+    .read_close     = read_close,
+    .read_seek2     = read_seek2,
 };