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ass: move text_event_to_ass from textdec.c to ass.c and export it

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Signed-off-by: Marton Balint <cus@passwd.hu>
This commit is contained in:
Marton Balint 2013-10-23 20:03:17 +02:00
parent 0f0a8d9859
commit b96325e023
3 changed files with 54 additions and 42 deletions
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39
libavcodec/ass.c
View File

@ -148,3 +148,42 @@ err:
av_bprint_finalize(&buf, NULL);
return ret;
}
void ff_ass_bprint_text_event(AVBPrint *buf, const char *p, int size,
const char *linebreaks, int keep_ass_markup)
{
const char *p_end = p + size;
for (; p < p_end && *p; p++) {
/* forced custom line breaks, not accounted as "normal" EOL */
if (linebreaks && strchr(linebreaks, *p)) {
av_bprintf(buf, "\\N");
/* standard ASS escaping so random characters don't get mis-interpreted
* as ASS */
} else if (!keep_ass_markup && strchr("{}\\", *p)) {
av_bprintf(buf, "\\%c", *p);
/* some packets might end abruptly (no \0 at the end, like for example
* in some cases of demuxing from a classic video container), some
* might be terminated with \n or \r\n which we have to remove (for
* consistency with those who haven't), and we also have to deal with
* evil cases such as \r at the end of the buffer (and no \0 terminated
* character) */
} else if (p[0] == '\n') {
/* some stuff left so we can insert a line break */
if (p < p_end - 1)
av_bprintf(buf, "\\N");
} else if (p[0] == '\r' && p < p_end - 1 && p[1] == '\n') {
/* \r followed by a \n, we can skip it. We don't insert the \N yet
* because we don't know if it is followed by more text */
continue;
/* finally, a sane character */
} else {
av_bprint_chars(buf, *p, 1);
}
}
av_bprintf(buf, "\r\n");
}

12
libavcodec/ass.h
View File

@ -113,4 +113,16 @@ int ff_ass_add_rect(AVSubtitle *sub, const char *dialog,
int ff_ass_bprint_dialog(AVBPrint *buf, const char *dialog,
int ts_start, int duration, int raw);
/**
* Escape a text subtitle using ASS syntax into an AVBPrint buffer.
* Newline characters will be escaped to \N.
*
* @param buf pointer to an initialized AVBPrint buffer
* @param p source text
* @param size size of the source text
* @param linebreaks additional newline chars, which will be escaped to \N
* @param keep_ass_markup braces and backslash will not be escaped if set
*/
void ff_ass_bprint_text_event(AVBPrint *buf, const char *p, int size,
const char *linebreaks, int keep_ass_markup);
#endif /* AVCODEC_ASS_H */

45
libavcodec/textdec.c
View File

@ -41,59 +41,20 @@ static const AVOption options[] = {
{ NULL }
};
static int text_event_to_ass(const AVCodecContext *avctx, AVBPrint *buf,
const char *p, const char *p_end)
{
const TextContext *text = avctx->priv_data;
for (; p < p_end && *p; p++) {
/* forced custom line breaks, not accounted as "normal" EOL */
if (text->linebreaks && strchr(text->linebreaks, *p)) {
av_bprintf(buf, "\\N");
/* standard ASS escaping so random characters don't get mis-interpreted
* as ASS */
} else if (!text->keep_ass_markup && strchr("{}\\", *p)) {
av_bprintf(buf, "\\%c", *p);
/* some packets might end abruptly (no \0 at the end, like for example
* in some cases of demuxing from a classic video container), some
* might be terminated with \n or \r\n which we have to remove (for
* consistency with those who haven't), and we also have to deal with
* evil cases such as \r at the end of the buffer (and no \0 terminated
* character) */
} else if (p[0] == '\n') {
/* some stuff left so we can insert a line break */
if (p < p_end - 1)
av_bprintf(buf, "\\N");
} else if (p[0] == '\r' && p < p_end - 1 && p[1] == '\n') {
/* \r followed by a \n, we can skip it. We don't insert the \N yet
* because we don't know if it is followed by more text */
continue;
/* finally, a sane character */
} else {
av_bprint_chars(buf, *p, 1);
}
}
av_bprintf(buf, "\r\n");
return 0;
}
static int text_decode_frame(AVCodecContext *avctx, void *data,
int *got_sub_ptr, AVPacket *avpkt)
{
AVBPrint buf;
AVSubtitle *sub = data;
const char *ptr = avpkt->data;
const TextContext *text = avctx->priv_data;
const int ts_start = av_rescale_q(avpkt->pts, avctx->time_base, (AVRational){1,100});
const int ts_duration = avpkt->duration != -1 ?
av_rescale_q(avpkt->duration, avctx->time_base, (AVRational){1,100}) : -1;
av_bprint_init(&buf, 0, AV_BPRINT_SIZE_UNLIMITED);
if (ptr && avpkt->size > 0 && *ptr &&
!text_event_to_ass(avctx, &buf, ptr, ptr + avpkt->size)) {
if (ptr && avpkt->size > 0 && *ptr) {
ff_ass_bprint_text_event(&buf, ptr, avpkt->size, text->linebreaks, text->keep_ass_markup);
if (!av_bprint_is_complete(&buf)) {
av_bprint_finalize(&buf, NULL);
return AVERROR(ENOMEM);