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segment: implement wrap around

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Provide a way to wrap around the segment index so pseudostreaming
live through a web server and html5 browser is simpler.

Also ensure that 0 (disable) is a valid value across the options
providing wrap around.
This commit is contained in:
Luca Barbato 2012-02-25 21:45:23 +01:00
parent ee42df8a35
commit 0c1759ac4b
2 changed files with 8 additions and 2 deletions
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2
doc/muxers.texi
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@ -353,6 +353,8 @@ Set segment duration to @var{t} seconds.
Generate also a listfile named @var{name}.
@item segment_list_size @var{size}
Overwrite the listfile once it reaches @var{size} entries.
@item segment_wrap @var{limit}
Wrap around segment index once it reaches @var{limit}.
@end table
@example

8
libavformat/segment.c
View File

@ -39,6 +39,7 @@ typedef struct {
char *list; /**< Set by a private option. */
float time; /**< Set by a private option. */
int size; /**< Set by a private option. */
int wrap; /**< Set by a private option. */
int64_t offset_time;
int64_t recording_time;
int has_video;
@ -51,6 +52,9 @@ static int segment_start(AVFormatContext *s)
AVFormatContext *oc = c->avf;
int err = 0;
if (c->wrap)
c->number %= c->wrap;
if (av_get_frame_filename(oc->filename, sizeof(oc->filename),
s->filename, c->number++) < 0)
return AVERROR(EINVAL);
@ -206,12 +210,11 @@ static int seg_write_packet(AVFormatContext *s, AVPacket *pkt)
if (seg->list) {
avio_printf(seg->pb, "%s\n", oc->filename);
avio_flush(seg->pb);
if (!(seg->number % seg->size)) {
if (seg->size && !(seg->number % seg->size)) {
avio_close(seg->pb);
if ((ret = avio_open2(&seg->pb, seg->list, AVIO_FLAG_WRITE,
&s->interrupt_callback, NULL)) < 0)
goto fail;
}
}
}
@ -250,6 +253,7 @@ static const AVOption options[] = {
{ "segment_time", "segment length in seconds", OFFSET(time), AV_OPT_TYPE_FLOAT, {.dbl = 2}, 0, FLT_MAX, E },
{ "segment_list", "output the segment list", OFFSET(list), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, E },
{ "segment_list_size", "maximum number of playlist entries", OFFSET(size), AV_OPT_TYPE_INT, {.dbl = 5}, 0, INT_MAX, E },
{ "segment_wrap", "number after which the index wraps", OFFSET(wrap), AV_OPT_TYPE_INT, {.dbl = 0}, 0, INT_MAX, E },
{ NULL },
};