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Parse the bitrate field in the ASMRuleBook ("AverageBandwidth") to fill in

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the AVStream->AVCodecContext->bit_rate field, which is not in the MDPR block
(the "OpaqueData" SDP field). This allows clients to choose streams based
on their bitrate, which is what most network-players base stream selection
on. (Of course, it is also possible to select based on anything else, that
is entirely up to the client.) See "[PATCH] rdt.c: ASM rulebook bitrate
reading" thread on mailinglist.

Originally committed as revision 16467 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Ronald S. Bultje 2009-01-07 14:41:40 +00:00
parent 3ca45429fe
commit 530bca9439
1 changed files with 14 additions and 0 deletions
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14
libavformat/rdt.c
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@ -428,6 +428,19 @@ rdt_parse_sdp_line (AVFormatContext *s, int st_index,
return 0; return 0;
} }
static void
real_parse_asm_rule(AVStream *st, const char *p, const char *end)
{
do {
/* can be either averagebandwidth= or AverageBandwidth= */
if (sscanf(p, " %*1[Aa]verage%*1[Bb]andwidth=%d", &st->codec->bit_rate) == 1)
break;
if (!(p = strchr(p, ',')) || p > end)
p = end;
p++;
} while (p < end);
}
static AVStream * static AVStream *
add_dstream(AVFormatContext *s, AVStream *orig_st) add_dstream(AVFormatContext *s, AVStream *orig_st)
{ {
@ -473,6 +486,7 @@ real_parse_asm_rulebook(AVFormatContext *s, AVStream *orig_st,
st = add_dstream(s, orig_st); st = add_dstream(s, orig_st);
else else
st = orig_st; st = orig_st;
real_parse_asm_rule(st, p, end);
n_rules++; n_rules++;
} }
p = end + 1; p = end + 1;