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Code Issues Releases Activity

avformat/sccdec: simplify demuxer a little

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This commit is contained in:
Paul B Mahol 2020-06-16 19:13:42 +02:00
parent 9887bcc6c6
commit 5422a4a7c5
1 changed files with 46 additions and 49 deletions
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95
libavformat/sccdec.c
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@ -63,11 +63,10 @@ static int scc_read_header(AVFormatContext *s)
{
SCCContext *scc = s->priv_data;
AVStream *st = avformat_new_stream(s, NULL);
char line[4096], line2[4096];
int64_t current_pos, next_pos;
int64_t ts_start, ts_end;
int count = 0, ret = 0;
ptrdiff_t len2, len;
char line2[4096], line[4096];
int64_t pos, ts, next_ts = AV_NOPTS_VALUE;
int ret = 0;
ptrdiff_t len;
uint8_t out[4096];
FFTextReader tr;
@ -79,41 +78,49 @@ static int scc_read_header(AVFormatContext *s)
st->codecpar->codec_type = AVMEDIA_TYPE_SUBTITLE;
st->codecpar->codec_id = AV_CODEC_ID_EIA_608;
while (!ff_text_eof(&tr)) {
while (!ff_text_eof(&tr) || next_ts == AV_NOPTS_VALUE || line2[0]) {
char *saveptr = NULL, *lline;
int hh1, mm1, ss1, fs1, i;
int hh2, mm2, ss2, fs2;
int hh, mm, ss, fs, i;
AVPacket *sub;
if (count == 0) {
current_pos = ff_text_pos(&tr);
if (next_ts == AV_NOPTS_VALUE) {
while (!ff_text_eof(&tr)) {
len = ff_subtitles_read_line(&tr, line, sizeof(line));
if (len > 13)
if (len <= 13)
continue;
if (!strncmp(line, "Scenarist_SCC V1.0", 18))
continue;
if (av_sscanf(line, "%d:%d:%d%*[:;]%d", &hh, &mm, &ss, &fs) == 4)
break;
}
ts = (hh * 3600LL + mm * 60LL + ss) * 1000LL + fs * 33;
while (!ff_text_eof(&tr)) {
len = ff_subtitles_read_line(&tr, line2, sizeof(line2));
if (len <= 13)
continue;
if (av_sscanf(line2, "%d:%d:%d%*[:;]%d", &hh, &mm, &ss, &fs) == 4)
break;
}
} else {
memmove(line, line2, sizeof(line));
line2[0] = 0;
while (!ff_text_eof(&tr)) {
len = ff_subtitles_read_line(&tr, line2, sizeof(line2));
if (len <= 13)
continue;
if (av_sscanf(line2, "%d:%d:%d%*[:;]%d", &hh, &mm, &ss, &fs) == 4)
break;
}
}
if (!strncmp(line, "Scenarist_SCC V1.0", 18))
continue;
if (av_sscanf(line, "%d:%d:%d%*[:;]%d", &hh1, &mm1, &ss1, &fs1) != 4)
continue;
next_ts = (hh * 3600LL + mm * 60LL + ss) * 1000LL + fs * 33;
ts_start = (hh1 * 3600LL + mm1 * 60LL + ss1) * 1000LL + fs1 * 33;
next_pos = ff_text_pos(&tr);
while (!ff_text_eof(&tr)) {
len2 = ff_subtitles_read_line(&tr, line2, sizeof(line2));
if (len2 > 13)
break;
}
if (av_sscanf(line2, "%d:%d:%d%*[:;]%d", &hh2, &mm2, &ss2, &fs2) != 4)
continue;
ts_end = (hh2 * 3600LL + mm2 * 60LL + ss2) * 1000LL + fs2 * 33;
count++;
try_again:
pos = ff_text_pos(&tr);
lline = (char *)&line;
lline += 12;
@ -134,20 +141,18 @@ try_again:
if (i > 12 && o1 == 0x94 && o2 == 0x20 && saveptr &&
(av_strncasecmp(saveptr, "942f", 4) || !av_strncasecmp(saveptr, "942c", 4))) {
int64_t duration;
out[i] = 0;
duration = i * 11;
sub = ff_subtitles_queue_insert(&scc->q, out, i, 0);
if (!sub)
goto fail;
sub->pos = current_pos;
current_pos += i;
sub->pts = ts_start;
sub->duration = duration;
ts_start += duration;
sub->pos = pos;
pos += i;
sub->pts = ts;
sub->duration = i * 11;
ts += sub->duration;
i = 0;
}
@ -162,18 +167,10 @@ try_again:
if (!sub)
goto fail;
sub->pos = current_pos;
sub->pts = ts_start;
sub->duration = ts_end - ts_start;
memmove(line, line2, sizeof(line));
current_pos = next_pos;
line2[0] = 0;
}
if (line[0]) {
ts_start = ts_end;
ts_end += 1200;
goto try_again;
sub->pos = pos;
sub->pts = ts;
sub->duration = next_ts - ts;
ts = next_ts;
}
ff_subtitles_queue_finalize(s, &scc->q);