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Add support for getting duration of a RTP stream (for seeking in stream)

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Patch by Ryan Martell % rdm4 A martellventures P com %
Original thread:
Date: Nov 6, 2006 6:39 PM
Subject: [Ffmpeg-devel] [PATCH] RTP/Get Duration of file (for seeking in stream)

Originally committed as revision 6921 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Ryan Martell 2006-11-06 21:58:43 +00:00 committed by Guillaume Poirier
parent 4408e75e02
commit 31693e00fc
1 changed files with 34 additions and 21 deletions
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55
libavformat/rtsp.c
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@ -345,6 +345,32 @@ static void sdp_parse_fmtp(AVStream *st, const char *p)
}
}
/** Parse a string \p in the form of Range:npt=xx-xx, and determine the start
* and end time.
* Used for seeking in the rtp stream.
*/
static void rtsp_parse_range_npt(const char *p, int64_t *start, int64_t *end)
{
char buf[256];
skip_spaces(&p);
if (!stristart(p, "npt=", &p))
return;
*start = AV_NOPTS_VALUE;
*end = AV_NOPTS_VALUE;
get_word_sep(buf, sizeof(buf), "-", &p);
*start = parse_date(buf, 1);
if (*p == '-') {
p++;
get_word_sep(buf, sizeof(buf), "-", &p);
*end = parse_date(buf, 1);
}
// av_log(NULL, AV_LOG_DEBUG, "Range Start: %lld\n", *start);
// av_log(NULL, AV_LOG_DEBUG, "Range End: %lld\n", *end);
}
typedef struct SDPParseState {
/* SDP only */
struct in_addr default_ip;
@ -506,6 +532,13 @@ static void sdp_parse_line(AVFormatContext *s, SDPParseState *s1,
}
}
}
} else if(strstart(p, "range:", &p)) {
int64_t start, end;
// this is so that seeking on a streamed file can work.
rtsp_parse_range_npt(p, &start, &end);
s->start_time= start;
s->duration= (end==AV_NOPTS_VALUE)?AV_NOPTS_VALUE:end-start; // AV_NOPTS_VALUE means live broadcast (and can't seek)
}
break;
}
@ -660,26 +693,6 @@ static void rtsp_parse_transport(RTSPHeader *reply, const char *p)
}
}
static void rtsp_parse_range_npt(RTSPHeader *reply, const char *p)
{
char buf[256];
skip_spaces(&p);
if (!stristart(p, "npt=", &p))
return;
reply->range_start = AV_NOPTS_VALUE;
reply->range_end = AV_NOPTS_VALUE;
get_word_sep(buf, sizeof(buf), "-", &p);
reply->range_start = parse_date(buf, 1);
if (*p == '-') {
p++;
get_word_sep(buf, sizeof(buf), "-", &p);
reply->range_end = parse_date(buf, 1);
}
}
void rtsp_parse_line(RTSPHeader *reply, const char *buf)
{
const char *p;
@ -695,7 +708,7 @@ void rtsp_parse_line(RTSPHeader *reply, const char *buf)
} else if (stristart(p, "CSeq:", &p)) {
reply->seq = strtol(p, NULL, 10);
} else if (stristart(p, "Range:", &p)) {
rtsp_parse_range_npt(reply, p);
rtsp_parse_range_npt(p, &reply->range_start, &reply->range_end);
}
}