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hlsdemux2: Use skip and blocking playlist delivery directives

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Detect when we can use a blocking request and delta playlist update requests and
add the required delivery directives to the request URI.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/3883>
This commit is contained in:
Jan Schmidt 2022-11-18 01:55:48 +11:00 committed by GStreamer Marge Bot
parent c16366e5f3
commit 8a0190b521
1 changed files with 96 additions and 2 deletions
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98
subprojects/gst-plugins-good/ext/adaptivedemux2/hls/gsthlsdemux-stream.c
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@ -1204,6 +1204,66 @@ gst_hls_demux_stream_advance_fragment (GstAdaptiveDemux2Stream * stream)
return GST_FLOW_EOS;
}
enum PlaylistDownloadParamFlags
{
PLAYLIST_DOWNLOAD_FLAG_SKIP_V1 = (1 << 0),
PLAYLIST_DOWNLOAD_FLAG_SKIP_V2 = (1 << 1), /* V2 also skips date-ranges */
PLAYLIST_DOWNLOAD_FLAG_BLOCKING_REQUEST = (1 << 2),
};
struct PlaylistDownloadParams
{
enum PlaylistDownloadParamFlags flags;
gint64 next_msn, next_part;
};
#define HLS_SKIP_QUERY_KEY "_HLS_skip"
#define HLS_MSN_QUERY_KEY "_HLS_msn"
#define HLS_PART_QUERY_KEY "_HLS_part"
gchar *
apply_directives_to_uri (GstHLSDemuxStream * stream,
const gchar * playlist_uri, struct PlaylistDownloadParams *dl_params)
{
GstUri *uri = gst_uri_from_string (playlist_uri);
if (dl_params->flags & PLAYLIST_DOWNLOAD_FLAG_SKIP_V1) {
GST_LOG_OBJECT (stream, "Doing HLS skip (v1) request");
gst_uri_set_query_value (uri, HLS_SKIP_QUERY_KEY, "YES");
} else if (dl_params->flags & PLAYLIST_DOWNLOAD_FLAG_SKIP_V2) {
GST_LOG_OBJECT (stream, "Doing HLS skip (v2) request");
gst_uri_set_query_value (uri, HLS_SKIP_QUERY_KEY, "v2");
} else {
gst_uri_remove_query_key (uri, HLS_SKIP_QUERY_KEY);
}
if (dl_params->flags & PLAYLIST_DOWNLOAD_FLAG_BLOCKING_REQUEST
&& dl_params->next_msn != -1) {
GST_LOG_OBJECT (stream,
"Doing HLS blocking request with MSN %" G_GINT64_FORMAT " part %"
G_GINT64_FORMAT, dl_params->next_msn, dl_params->next_part);
gchar *next_msn_str =
g_strdup_printf ("%" G_GINT64_FORMAT, dl_params->next_msn);
gst_uri_set_query_value (uri, HLS_MSN_QUERY_KEY, next_msn_str);
g_free (next_msn_str);
if (dl_params->next_part != -1) {
gchar *next_part_str =
g_strdup_printf ("%" G_GINT64_FORMAT, dl_params->next_part);
gst_uri_set_query_value (uri, HLS_PART_QUERY_KEY, next_part_str);
g_free (next_part_str);
} else {
gst_uri_remove_query_key (uri, HLS_PART_QUERY_KEY);
}
}
gchar *out_uri = gst_uri_to_string (uri);
gst_uri_unref (uri);
return out_uri;
}
static GstHLSMediaPlaylist *
download_media_playlist (GstHLSDemuxStream * stream, gchar * uri,
GError ** err, GstHLSMediaPlaylist * current)
@ -1215,6 +1275,7 @@ download_media_playlist (GstHLSDemuxStream * stream, gchar * uri,
GstHLSMediaPlaylist *playlist = NULL;
gchar *base_uri;
gboolean playlist_uri_change = FALSE;
struct PlaylistDownloadParams dl_params = { 0, };
GstAdaptiveDemux2Stream *base_stream = GST_ADAPTIVE_DEMUX2_STREAM (stream);
GstAdaptiveDemux *demux = base_stream->demux;
@ -1226,12 +1287,45 @@ download_media_playlist (GstHLSDemuxStream * stream, gchar * uri,
playlist_uri_change = (current == NULL || g_strcmp0 (uri, current->uri) != 0);
if (!playlist_uri_change) {
GST_LOG_OBJECT (demux, "Updating the playlist");
GST_LOG_OBJECT (stream, "Updating the playlist");
/* See if we can do a delta playlist update (if the playlist age is less than
* one half of the Skip Boundary */
GstClockTime now = gst_adaptive_demux2_get_monotonic_time (demux);
GstClockTimeDiff playlist_age = GST_CLOCK_DIFF (current->playlist_ts, now);
if (GST_CLOCK_TIME_IS_VALID (current->playlist_ts) &&
GST_CLOCK_TIME_IS_VALID (current->skip_boundary) &&
playlist_age <= current->skip_boundary / 2) {
if (current->can_skip_dateranges) {
dl_params.flags |= PLAYLIST_DOWNLOAD_FLAG_SKIP_V2;
} else {
dl_params.flags |= PLAYLIST_DOWNLOAD_FLAG_SKIP_V1;
}
}
}
/* Blocking playlist reload check */
if (current != NULL && current->can_block_reload) {
if (playlist_uri_change) {
/* FIXME: We're changing playlist, but if there's a EXT-X-RENDITION-REPORT
* for the new playlist we might be able to use it to do a blocking request */
} else {
/* Get the next MSN (and/or possibly part number) for the request params */
gst_hls_media_playlist_get_next_msn_and_part (current,
stream->llhls_enabled, &dl_params.next_msn, &dl_params.next_part);
dl_params.flags |= PLAYLIST_DOWNLOAD_FLAG_BLOCKING_REQUEST;
}
}
gchar *target_uri = apply_directives_to_uri (stream, uri, &dl_params);
download =
downloadhelper_fetch_uri (demux->download_helper,
uri, main_uri, DOWNLOAD_FLAG_COMPRESS | DOWNLOAD_FLAG_FORCE_REFRESH, err);
target_uri, main_uri,
DOWNLOAD_FLAG_COMPRESS | DOWNLOAD_FLAG_FORCE_REFRESH, err);
g_free (target_uri);
if (download == NULL)
return NULL;