static int srt_read_header(AVFormatContext *s)
{
SRTContext *srt = s->priv_data;
AVBPrint buf;
AVStream *st = avformat_new_stream(s, NULL);
int res = 0;
FFTextReader tr;
ff_text_init_avio(s, &tr, s->pb);
if (!st)
return AVERROR(ENOMEM);
avpriv_set_pts_info(st, 64, 1, 1000);
st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
st->codec->codec_id = AV_CODEC_ID_SUBRIP;
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(&srt->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(&srt->q);
end:
av_bprint_finalize(&buf, NULL);
return res;
}
static int sami_read_header(AVFormatContext *s)
{
SAMIContext *sami = s->priv_data;
AVStream *st = avformat_new_stream(s, NULL);
AVBPrint buf, hdr_buf;
char c = 0;
int res = 0, got_first_sync_point = 0;
FFTextReader tr;
ff_text_init_avio(&tr, s->pb);
if (!st)
return AVERROR(ENOMEM);
avpriv_set_pts_info(st, 64, 1, 1000);
st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
st->codec->codec_id = AV_CODEC_ID_SAMI;
av_bprint_init(&buf, 0, AV_BPRINT_SIZE_UNLIMITED);
av_bprint_init(&hdr_buf, 0, AV_BPRINT_SIZE_UNLIMITED);
while (!ff_text_eof(&tr)) {
AVPacket *sub;
const int64_t pos = ff_text_pos(&tr) - (c != 0);
int is_sync, n = ff_smil_extract_next_text_chunk(&tr, &buf, &c);
if (n == 0)
break;
is_sync = !av_strncasecmp(buf.str, "<SYNC", 5);
if (is_sync)
got_first_sync_point = 1;
if (!got_first_sync_point) {
av_bprintf(&hdr_buf, "%s", buf.str);
} else {
sub = ff_subtitles_queue_insert(&sami->q, buf.str, buf.len, !is_sync);
if (!sub) {
res = AVERROR(ENOMEM);
goto end;
}
if (is_sync) {
const char *p = ff_smil_get_attr_ptr(buf.str, "Start");
sub->pos = pos;
sub->pts = p ? strtol(p, NULL, 10) : 0;
sub->duration = -1;
}
}
av_bprint_clear(&buf);
}
res = avpriv_bprint_to_extradata(st->codec, &hdr_buf);
if (res < 0)
goto end;
ff_subtitles_queue_finalize(&sami->q);
end:
av_bprint_finalize(&buf, NULL);
return res;
}
static int ass_read_header(AVFormatContext *s)
{
ASSContext *ass = s->priv_data;
AVBPrint header, line, rline;
int res = 0;
AVStream *st;
FFTextReader tr;
ff_text_init_avio(s, &tr, s->pb);
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_ASS;
av_bprint_init(&header, 0, AV_BPRINT_SIZE_UNLIMITED);
av_bprint_init(&line, 0, AV_BPRINT_SIZE_UNLIMITED);
av_bprint_init(&rline, 0, AV_BPRINT_SIZE_UNLIMITED);
for (;;) {
int64_t pos = get_line(&line, &tr);
int64_t ts_start = AV_NOPTS_VALUE;
int duration = -1;
AVPacket *sub;
if (!line.str[0]) // EOF
break;
if (read_dialogue(ass, &rline, line.str, &ts_start, &duration) < 0) {
av_bprintf(&header, "%s", line.str);
continue;
}
sub = ff_subtitles_queue_insert(&ass->q, rline.str, rline.len, 0);
if (!sub) {
res = AVERROR(ENOMEM);
goto end;
}
sub->pos = pos;
sub->pts = ts_start;
sub->duration = duration;
}
res = avpriv_bprint_to_extradata(st->codec, &header);
if (res < 0)
goto end;
ff_subtitles_queue_finalize(&ass->q);
end:
av_bprint_finalize(&header, NULL);
av_bprint_finalize(&line, NULL);
av_bprint_finalize(&rline, NULL);
return res;
}
static int realtext_read_header(AVFormatContext *s)
{
RealTextContext *rt = s->priv_data;
AVStream *st = avformat_new_stream(s, NULL);
AVBPrint buf;
char c = 0;
int res = 0, duration = read_ts("60"); // default duration is 60 seconds
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_REALTEXT;
av_bprint_init(&buf, 0, AV_BPRINT_SIZE_UNLIMITED);
while (!ff_text_eof(&tr)) {
AVPacket *sub;
const int64_t pos = ff_text_pos(&tr) - (c != 0);
int n = ff_smil_extract_next_text_chunk(&tr, &buf, &c);
if (n == 0)
break;
if (!av_strncasecmp(buf.str, "<window", 7)) {
/* save header to extradata */
const char *p = ff_smil_get_attr_ptr(buf.str, "duration");
if (p)
duration = read_ts(p);
st->codec->extradata = av_strdup(buf.str);
if (!st->codec->extradata) {
res = AVERROR(ENOMEM);
goto end;
}
st->codec->extradata_size = buf.len + 1;
} else {
/* if we just read a <time> tag, introduce a new event, otherwise merge
* with the previous one */
int merge = !av_strncasecmp(buf.str, "<time", 5) ? 0 : 1;
sub = ff_subtitles_queue_insert(&rt->q, buf.str, buf.len, merge);
if (!sub) {
res = AVERROR(ENOMEM);
goto end;
}
if (!merge) {
const char *begin = ff_smil_get_attr_ptr(buf.str, "begin");
const char *end = ff_smil_get_attr_ptr(buf.str, "end");
sub->pos = pos;
sub->pts = begin ? read_ts(begin) : 0;
sub->duration = end ? (read_ts(end) - sub->pts) : duration;
}
}
av_bprint_clear(&buf);
}
ff_subtitles_queue_finalize(&rt->q);
end:
av_bprint_finalize(&buf, NULL);
return res;
}
static int scc_read_header(AVFormatContext *s)
{
SCCContext *scc = s->priv_data;
AVStream *st = avformat_new_stream(s, NULL);
char line[4096], line2[4096];
int count = 0, ret = 0;
ptrdiff_t len2, len;
uint8_t out[4096];
FFTextReader tr;
ff_text_init_avio(s, &tr, s->pb);
if (!st)
return AVERROR(ENOMEM);
avpriv_set_pts_info(st, 64, 1, 1000);
st->codecpar->codec_type = AVMEDIA_TYPE_SUBTITLE;
st->codecpar->codec_id = AV_CODEC_ID_EIA_608;
while (!ff_text_eof(&tr)) {
const int64_t pos = ff_text_pos(&tr);
char *saveptr = NULL, *lline;
int hh1, mm1, ss1, fs1, i;
int hh2, mm2, ss2, fs2;
int64_t ts_start, ts_end;
AVPacket *sub;
if (count == 0) {
while (!ff_text_eof(&tr)) {
len = ff_subtitles_read_line(&tr, line, sizeof(line));
if (len > 13)
break;
}
}
if (!strncmp(line, "Scenarist_SCC V1.0", 18))
continue;
if (sscanf(line, "%d:%d:%d%*[:;]%d", &hh1, &mm1, &ss1, &fs1) != 4)
continue;
ts_start = (hh1 * 3600LL + mm1 * 60LL + ss1) * 1000LL + fs1 * 33;
while (!ff_text_eof(&tr)) {
len2 = ff_subtitles_read_line(&tr, line2, sizeof(line2));
if (len2 > 13)
break;
}
if (sscanf(line2, "%d:%d:%d%*[:;]%d", &hh2, &mm2, &ss2, &fs2) != 4)
continue;
ts_end = (hh2 * 3600LL + mm2 * 60LL + ss2) * 1000LL + fs2 * 33;
count++;
lline = (char *)&line;
lline += 12;
for (i = 0; i < 4095; i += 3) {
char *ptr = av_strtok(lline, " ", &saveptr);
char c1, c2, c3, c4;
if (!ptr)
break;
if (sscanf(ptr, "%c%c%c%c", &c1, &c2, &c3, &c4) != 4)
break;
lline = NULL;
out[i+0] = 0xfc;
out[i+1] = convert(c2) | (convert(c1) << 4);
out[i+2] = convert(c4) | (convert(c3) << 4);
}
out[i] = 0;
sub = ff_subtitles_queue_insert(&scc->q, out, i, 0);
if (!sub)
return AVERROR(ENOMEM);
sub->pos = pos;
sub->pts = ts_start;
sub->duration = FFMAX(1200, ts_end - ts_start);
memmove(line, line2, sizeof(line));
FFSWAP(ptrdiff_t, len, len2);
}
ff_subtitles_queue_finalize(s, &scc->q);
return ret;
}
void ff_text_init_buf(FFTextReader *r, void *buf, size_t size)
{
memset(&r->buf_pb, 0, sizeof(r->buf_pb));
ffio_init_context(&r->buf_pb, buf, size, 0, NULL, NULL, NULL, NULL);
ff_text_init_avio(r, &r->buf_pb);
}