On 11/24/2019 6:42 AM, Firefox OS via curl-library wrote:
Dnia 2019-11-24, o godz. 10:21:07
tangram67 via curl-library<[email protected]> napisał(a):
Hi to all.
I'm using libcurl as a receiver for MP3 radio streams.
When using custom headers in conjunction with header and body data
callbacks, some data is missing in the data callbacks. This is also
reproducable when using the following command line:
curl --header "Icy-MetaData: 1" -sD - -o ./ndr1.mp3
http://ndr-edge-2061.dus-lg.cdn.addradio.net/ndr/ndr1niedersachsen/hannover/mp3/128/stream.mp3
If you play the resulting MP3 file with some kind of media player you
can hear dropdowns caused by missing data. If you remove the custom
header, then the stream is OK. Also this behaviour is independant of the
header value, so any header string will cause the problem.
Hi Dirk,
What makes you think the dropdowns are caused by missing data?
You requested the server to multiplex metadata with the MP3 stream.
You can't send such a stream directly to MP3 decoder. Instead,
your client needs to extract "icy-metaint:" response header and demux
the stream appropriately (extract the metadata instead of sending
them to MP3 decoder). Otherwise you're periodically feeding the decoder
with garbage.
Please cross-check your results with a client which doesn't use libcurl, e.g.
wget -S --header "Icy-MetaData: 1" -O
ndr2.mp3http://ndr-edge-2061.dus-lg.cdn.addradio.net/ndr/ndr1niedersachsen/hannover/mp3/128/stream.mp3
For demux explanation check out https://stackoverflow.com/a/44090879 so
it is possible, but I'd only do it if you have to.
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