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| author | Hosang Lee <hosang10.lee@lge.com> | 2017-11-25 22:24:39 +0900 |
|---|---|---|
| committer | Nicolas Dufresne <nicolas.dufresne@collabora.com> | 2017-12-06 15:02:40 -0500 |
| commit | 6a5bae5343305b0284cd79d5081ba92c272a519b (patch) | |
| tree | d74609931f9201f8c802b2634791fe0048b374b1 /ext/hls | |
| parent | 9667ba688ee590fc36098d4bda78df72a173205a (diff) | |
| download | gstreamer-plugins-bad-6a5bae5343305b0284cd79d5081ba92c272a519b.tar.gz | |
m3u8: Parse and use AVERAGE-BANDWIDTH attribute if available
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
Diffstat (limited to 'ext/hls')
| -rw-r--r-- | ext/hls/m3u8.c | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/ext/hls/m3u8.c b/ext/hls/m3u8.c index 1d210c325..594a963eb 100644 --- a/ext/hls/m3u8.c +++ b/ext/hls/m3u8.c @@ -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"); |