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m3u8: Parse and use AVERAGE-BANDWIDTH attribute if available

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The AVERAGE-BANDWIDTH attribute in the EXT-X-STREAM-INF tag represents
the average segment bit rate of the Variant Stream, while the BANDWIDTH
attribute represents the peak segment bit rate of the Variant Stream.
(https://tools.ietf.org/html/draft-pantos-http-live-streaming-23#section-4.3.4.2)
Using the average bit rate instead of the peak bit rate for variant switching
is more efficient and appropriate. Sometimes due to VBR encoding,
the BANDWIDTH may represent a value way above the average bit rate,
which could result to players not switching to that variant stream
 although network bandwidth is sufficiently available.

https://bugzilla.gnome.org/show_bug.cgi?id=790821
This commit is contained in:
Hosang Lee 2017-11-25 22:24:39 +09:00 committed by Nicolas Dufresne
parent 9667ba688e
commit 6a5bae5343
1 changed files with 8 additions and 1 deletions
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9
ext/hls/m3u8.c
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@ -1529,8 +1529,15 @@ gst_hls_master_playlist_new_from_data (gchar * data, const gchar * base_uri)
data += stream->iframe ? 26 : 18;
while (data && parse_attributes (&data, &a, &v)) {
if (g_str_equal (a, "BANDWIDTH")) {
if (!stream->bandwidth) {
if (!int_from_string (v, NULL, &stream->bandwidth))
GST_WARNING ("Error while reading BANDWIDTH");
}
} else if (g_str_equal (a, "AVERAGE-BANDWIDTH")) {
GST_DEBUG
("AVERAGE-BANDWIDTH attribute available. Using it as stream bandwidth");
if (!int_from_string (v, NULL, &stream->bandwidth))
GST_WARNING ("Error while reading BANDWIDTH");
GST_WARNING ("Error while reading AVERAGE-BANDWIDTH");
} else if (g_str_equal (a, "PROGRAM-ID")) {
if (!int_from_string (v, NULL, &stream->program_id))
GST_WARNING ("Error while reading PROGRAM-ID");