Commit d948893d authored by Clément Bœsch's avatar Clément Bœsch

lavf/subtitles: add some SMIL helpers.

This is needed for SAMI and RealText demuxers.
parent e301f2f8
......@@ -20,6 +20,7 @@
#include "avformat.h"
#include "subtitles.h"
#include "libavutil/avstring.h"
AVPacket *ff_subtitles_queue_insert(FFDemuxSubtitlesQueue *q,
const uint8_t *event, int len, int merge)
......@@ -99,3 +100,46 @@ void ff_subtitles_queue_clean(FFDemuxSubtitlesQueue *q)
av_freep(&q->subs);
q->nb_subs = q->allocated_size = q->current_sub_idx = 0;
}
int ff_smil_extract_next_chunk(AVIOContext *pb, AVBPrint *buf, char *c)
{
int i = 0;
char end_chr;
if (!*c) // cached char?
*c = avio_r8(pb);
if (!*c)
return 0;
end_chr = *c == '<' ? '>' : '<';
do {
av_bprint_chars(buf, *c, 1);
*c = avio_r8(pb);
i++;
} while (*c != end_chr && *c);
if (end_chr == '>') {
av_bprint_chars(buf, '>', 1);
*c = 0;
}
return i;
}
const char *ff_smil_get_attr_ptr(const char *s, const char *attr)
{
int in_quotes = 0;
const int len = strlen(attr);
while (*s) {
while (*s) {
if (!in_quotes && isspace(*s))
break;
in_quotes ^= *s == '"'; // XXX: support escaping?
s++;
}
while (isspace(*s))
s++;
if (!av_strncasecmp(s, attr, len) && s[len] == '=')
return s + len + 1 + (s[len + 1] == '"');
}
return NULL;
}
......@@ -23,6 +23,7 @@
#include <stdint.h>
#include "avformat.h"
#include "libavutil/bprint.h"
typedef struct {
AVPacket *subs; ///< array of subtitles packets
......@@ -58,4 +59,19 @@ int ff_subtitles_queue_read_packet(FFDemuxSubtitlesQueue *q, AVPacket *pkt);
*/
void ff_subtitles_queue_clean(FFDemuxSubtitlesQueue *q);
/**
* SMIL helper to load next chunk ("<...>" or untagged content) in buf.
*
* @param c cached character, to avoid a backward seek
*/
int ff_smil_extract_next_chunk(AVIOContext *pb, AVBPrint *buf, char *c);
/**
* SMIL helper to point on the value of an attribute in the given tag.
*
* @param s SMIL tag ("<...>")
* @param attr the attribute to look for
*/
const char *ff_smil_get_attr_ptr(const char *s, const char *attr);
#endif /* AVFORMAT_SUBTITLES_H */
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