* 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
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 && c != '\r')
- buf[i++] = c;
- }while(c != '\n' && c);
-
- buf[i] = 0;
-}
-
static int probe(AVProbeData *p)
{
const char *header= "[Script Info]";
if(sscanf(p, "%*[^,],%d:%d:%d%*c%d", &hour, &min, &sec, &hsec) != 4)
return AV_NOPTS_VALUE;
-// av_log(NULL, AV_LOG_ERROR, "%d %d %d %d %d [%s]\n", i, hour, min, sec, hsec, p);
+ av_dlog(NULL, "%d %d %d %d [%s]\n", hour, min, sec, hsec, p);
min+= 60*hour;
sec+= 60*min;
return sec*100+hsec;
}
-static int event_cmp(uint8_t **a, uint8_t **b)
+static int event_cmp(const void *_a, const void *_b)
{
+ const uint8_t *const *a = _a, *const *b = _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);
- st->codec->codec_type = CODEC_TYPE_SUBTITLE;
- st->codec->codec_id= CODEC_ID_SSA;
+ 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;
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;
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--;
}
end= strchr(p, '\n');
av_new_packet(pkt, end ? end-p+1 : strlen(p));
- pkt->flags |= PKT_FLAG_KEY;
+ pkt->flags |= AV_PKT_FLAG_KEY;
pkt->pos= p - ass->event_buffer + s->streams[0]->codec->extradata_size;
pkt->pts= pkt->dts= get_pts(p);
memcpy(pkt->data, p, pkt->size);
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("SSA (SubStation Alpha) subtitle"),
+ .priv_data_size = sizeof(ASSContext),
+ .read_probe = probe,
+ .read_header = read_header,
+ .read_packet = read_packet,
+ .read_close = read_close,
+ .read_seek2 = read_seek2,
};
projects / ffmpeg / blobdiff