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396 lines
12 KiB
C
396 lines
12 KiB
C
/* GStreamer
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* Copyright (C) 2010 Marc-Andre Lureau <marcandre.lureau@gmail.com>
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* Copyright (C) 2010 Andoni Morales Alastruey <ylatuya@gmail.com>
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* Copyright (C) 2015 Tim-Philipp Müller <tim@centricular.com>
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*
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* Copyright (C) 2021-2022 Centricular Ltd
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* Author: Edward Hervey <edward@centricular.com>
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* Author: Jan Schmidt <jan@centricular.com>
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*
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* m3u8.h:
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*/
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#ifndef __M3U8_H__
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#define __M3U8_H__
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#include <gst/gst.h>
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G_BEGIN_DECLS
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typedef struct _GstHLSMediaPlaylist GstHLSMediaPlaylist;
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typedef struct _GstHLSTimeMap GstHLSTimeMap;
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typedef struct _GstM3U8MediaSegment GstM3U8MediaSegment;
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typedef struct _GstM3U8InitFile GstM3U8InitFile;
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typedef struct _GstHLSRenditionStream GstHLSRenditionStream;
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typedef struct _GstM3U8Client GstM3U8Client;
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typedef struct _GstHLSVariantStream GstHLSVariantStream;
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typedef struct _GstHLSMasterPlaylist GstHLSMasterPlaylist;
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#define GST_HLS_MEDIA_PLAYLIST(m) ((GstHLSMediaPlaylist*)m)
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#define GST_M3U8_MEDIA_SEGMENT(f) ((GstM3U8MediaSegment*)f)
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#define GST_HLS_MEDIA_PLAYLIST_LOCK(m) g_mutex_lock (&m->lock);
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#define GST_HLS_MEDIA_PLAYLIST_UNLOCK(m) g_mutex_unlock (&m->lock);
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#define GST_HLS_MEDIA_PLAYLIST_IS_LIVE(m) ((m)->endlist == FALSE)
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/* hlsdemux must not get closer to the end of a live stream than
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GST_M3U8_LIVE_MIN_FRAGMENT_DISTANCE fragments. Section 6.3.3
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"Playing the Playlist file" of the HLS draft states that this
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value is three fragments */
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#define GST_M3U8_LIVE_MIN_FRAGMENT_DISTANCE 3
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typedef enum {
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GST_HLS_PLAYLIST_TYPE_UNDEFINED,
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GST_HLS_PLAYLIST_TYPE_EVENT,
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GST_HLS_PLAYLIST_TYPE_VOD,
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} GstHLSPlaylistType;
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/**
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* GstHLSMediaPlaylist:
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*
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* Official term in RFC : "Media Playlist". A List of Media Segments.
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*
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* It can be used by either a variant stream (GstHLSVariantStream) or an
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* alternate rendition (GstHLSMedia).
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*
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* Note: Was called `GstM3u8` in legacy elements
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*/
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struct _GstHLSMediaPlaylist
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{
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gchar *uri; /* actually downloaded URI */
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gchar *base_uri; /* URI to use as base for resolving relative URIs.
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* This will be different to uri in case of redirects */
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/* Base Tag */
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gint version; /* EXT-X-VERSION (default 1) */
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/* Media Playlist Tags */
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GstClockTime targetduration; /* EXT-X-TARGETDURATION, default GST_CLOCK_TIME_NONE */
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gint64 media_sequence; /* EXT-X-MEDIA-SEQUENCE, MSN of the first Media
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Segment in the playlist. */
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gint64 discont_sequence; /* EXT-X-DISCONTINUITY-SEQUENCE. Default : 0 */
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gboolean has_ext_x_dsn; /* EXT-X-DISCONTINUITY-SEQUENCE present and specified */
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gboolean endlist; /* EXT-X-ENDLIST present */
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GstHLSPlaylistType type; /* EXT-X-PLAYLIST-TYPE. Default:
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GST_HLS_PLAYLIST_TYE_UNDEFINED */
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gboolean i_frame; /* EXT-X-I-FRAMES-ONLY present. */
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gboolean allowcache; /* deprecated EXT-X-ALLOW-CACHE */
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/* Overview of contained media segments */
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gboolean ext_x_key_present; /* a valid EXT-X-KEY is present on at least one
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media segment */
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gboolean ext_x_pdt_present; /* a valid EXT-X-PROGRAM-DATE-TIME is present on
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at least one media segment */
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GPtrArray *segments; /* Array of GstM3U8MediaSegment */
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/* Generated information */
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GstClockTime duration; /* The estimated total duration of all segments
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contained in this playlist */
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gboolean reloaded; /* If TRUE, this indicates that this playlist
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* was reloaded but had identical content */
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/*< private > */
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GMutex lock;
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/* Copy of the incoming data that created this media playlist.
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* See gst_hls_media_playlist_has_same_data() */
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gchar *last_data;
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gint ref_count; /* ATOMIC */
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};
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/* gst_hls_media_playlist_new: Internal function : Do not use from demuxer code, only for unit
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* testing purposes */
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GstHLSMediaPlaylist * gst_hls_media_playlist_new (const gchar * uri,
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const gchar * base_uri);
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GstHLSMediaPlaylist * gst_hls_media_playlist_ref (GstHLSMediaPlaylist * m3u8);
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void gst_hls_media_playlist_unref (GstHLSMediaPlaylist * m3u8);
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/**
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* GstM3U8MediaSegment:
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*
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* Official term in RFC : "Media Segment"
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*
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* Note : Naming in legacy elements was GstM3U8MediaFile
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*/
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struct _GstM3U8MediaSegment
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{
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gchar *title;
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GstClockTimeDiff stream_time; /* Computed stream time */
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GstClockTime duration;
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gchar *uri;
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gint64 sequence; /* the sequence number of this segment */
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gint64 discont_sequence; /* The Discontinuity Sequence Number of this segment */
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gboolean discont; /* this file marks a discontinuity */
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gchar *key;
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guint8 iv[16];
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gint64 offset, size;
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gint ref_count; /* ATOMIC */
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GstM3U8InitFile *init_file; /* Media Initialization (hold ref) */
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GDateTime *datetime; /* EXT-X-PROGRAM-DATE-TIME */
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};
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struct _GstM3U8InitFile
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{
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gchar *uri;
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gint64 offset, size;
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guint ref_count; /* ATOMIC */
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};
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GstM3U8MediaSegment *
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gst_m3u8_media_segment_ref (GstM3U8MediaSegment * mfile);
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void
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gst_m3u8_media_segment_unref (GstM3U8MediaSegment * mfile);
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gboolean
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gst_hls_media_playlist_has_same_data (GstHLSMediaPlaylist * m3u8,
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gchar * playlist_data);
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GstHLSMediaPlaylist *
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gst_hls_media_playlist_parse (gchar * data,
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const gchar * uri,
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const gchar * base_uri);
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void
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gst_hls_media_playlist_recalculate_stream_time (GstHLSMediaPlaylist *playlist,
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GstM3U8MediaSegment *anchor);
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GstM3U8MediaSegment *
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gst_hls_media_playlist_sync_to_segment (GstHLSMediaPlaylist * m3u8,
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GstM3U8MediaSegment * segment);
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gboolean
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gst_hls_media_playlist_sync_to_playlist (GstHLSMediaPlaylist * m3u8,
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GstHLSMediaPlaylist * reference);
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gboolean
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gst_hls_media_playlist_has_next_fragment (GstHLSMediaPlaylist * m3u8,
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GstM3U8MediaSegment * current,
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gboolean forward);
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GstM3U8MediaSegment *
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gst_hls_media_playlist_advance_fragment (GstHLSMediaPlaylist * m3u8,
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GstM3U8MediaSegment * current,
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gboolean forward);
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GstM3U8MediaSegment *
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gst_hls_media_playlist_get_starting_segment (GstHLSMediaPlaylist *self);
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GstClockTime
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gst_hls_media_playlist_get_duration (GstHLSMediaPlaylist * m3u8);
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gchar *
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gst_hls_media_playlist_get_uri (GstHLSMediaPlaylist * m3u8);
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gboolean
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gst_hls_media_playlist_is_live (GstHLSMediaPlaylist * m3u8);
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gboolean
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gst_hls_media_playlist_get_seek_range (GstHLSMediaPlaylist * m3u8,
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gint64 * start,
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gint64 * stop);
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gboolean
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gst_hls_media_playlist_has_lost_sync (GstHLSMediaPlaylist * m3u8,
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GstClockTime position);
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GstM3U8MediaSegment *
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gst_hls_media_playlist_seek (GstHLSMediaPlaylist *playlist,
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gboolean forward,
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GstSeekFlags flags,
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GstClockTimeDiff ts);
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void
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gst_hls_media_playlist_dump (GstHLSMediaPlaylist* self);
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typedef enum
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{
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GST_HLS_RENDITION_STREAM_TYPE_INVALID = -1,
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GST_HLS_RENDITION_STREAM_TYPE_AUDIO,
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GST_HLS_RENDITION_STREAM_TYPE_VIDEO,
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GST_HLS_RENDITION_STREAM_TYPE_SUBTITLES,
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GST_HLS_RENDITION_STREAM_TYPE_CLOSED_CAPTIONS,
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GST_HLS_N_MEDIA_TYPES
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} GstHLSRenditionStreamType;
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/**
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* GstHLSRenditionStream:
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*
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* Official term in RFC : "Renditions are alternate versions of the content,
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* such as audio produced in different languages or video recorded from
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* different camera angles."
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*
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* Note: Was named GstHLSMedia in legacy elements
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*/
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struct _GstHLSRenditionStream {
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GstHLSRenditionStreamType mtype;
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gchar *group_id;
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gchar *name;
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gchar *lang;
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gchar *uri;
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GstCaps *caps;
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gboolean is_default;
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gboolean autoselect;
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gboolean forced;
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gint ref_count; /* ATOMIC */
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};
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GstHLSRenditionStream *
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gst_hls_rendition_stream_ref (GstHLSRenditionStream * media);
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void
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gst_hls_rendition_stream_unref (GstHLSRenditionStream * media);
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const gchar *
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gst_hls_rendition_stream_type_get_name (GstHLSRenditionStreamType mtype);
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/**
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* GstHLSVariantStream:
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*
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* Official term in RFC :
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* """
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* A Master Playlist provides a set of Variant Streams, each of which describes
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* a different version of the same content.
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*
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* A Variant Stream includes a Media Playlist that specifies media encoded at a
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* particular bit rate, in a particular format, and at a particular resolution
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* for media containing video.
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* """
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*/
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struct _GstHLSVariantStream {
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gchar *name; /* This will be the "name" of the playlist, the original
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* relative/absolute uri in a variant playlist */
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gchar *uri;
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gchar *codecs;
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GstCaps *caps;
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GstStreamType codecs_stream_type; /* As defined by codecs */
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gint bandwidth; /* bits per second */
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gint program_id;
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gint width;
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gint height;
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gboolean iframe;
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gint refcount; /* ATOMIC */
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/* alternative renditions (names) */
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gchar *media_groups[GST_HLS_N_MEDIA_TYPES];
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/* List of gchar* fallback uri */
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GList *fallback;
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};
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/* Notes: #define are to avoid symbol clashes with legacy hlsdemux */
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#define gst_hls_variant_stream_ref hls_variant_stream_ref
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GstHLSVariantStream * hls_variant_stream_ref (GstHLSVariantStream * stream);
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#define gst_hls_variant_stream_unref hls_variant_stream_unref
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void hls_variant_stream_unref (GstHLSVariantStream * stream);
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/**
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* GstHLSMasterPlaylist:
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*
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* Official term in RFC : "A Playlist is either a Media Playlist or a Master
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* Playlist."
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*
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* This is the top-level object, constructed by a manifest provided by external
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* means.
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*/
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struct _GstHLSMasterPlaylist
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{
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/* Available variant streams, sorted by bitrate (low -> high) */
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GList *variants; /* GstHLSVariantStream */
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GList *iframe_variants; /* GstHLSVariantStream */
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/* Default variant, first in the list (originally, before sorting) */
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GstHLSVariantStream *default_variant;
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/* Full list of Available Alternative Rendition (GstHLSRenditionStream) */
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GList *renditions;
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/* EXT-X-VERSION. 0 if unspecified */
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gint version;
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/* TRUE if this playlist is a simple media playlist (and not a master
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* playlist). Implies that there is only a single variant and no alternate
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* rendition groups */
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gboolean is_simple;
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/* TRUE if all variants have codecs specified */
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gboolean have_codecs;
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/*< private > */
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gchar *last_data; /* Copy of the incoming data that created this master playlist */
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gint refcount; /* ATOMIC */
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};
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/* Notes: #define are to avoid symbol clashes with legacy hlsdemux */
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#define gst_hls_master_playlist_new_from_data hls_master_playlist_new_from_data
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GstHLSMasterPlaylist * hls_master_playlist_new_from_data (gchar * data,
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const gchar * base_uri);
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#define gst_hls_master_playlist_get_variant_for_bitrate hls_master_playlist_get_variant_for_bitrate
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GstHLSVariantStream * hls_master_playlist_get_variant_for_bitrate (GstHLSMasterPlaylist * playlist,
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GstHLSVariantStream * current_variant,
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guint bitrate,
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guint min_bitrate);
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#define gst_hls_master_playlist_get_common_caps hls_master_playlist_get_common_caps
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GstCaps * hls_master_playlist_get_common_caps (GstHLSMasterPlaylist *playlist);
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#define gst_hls_master_playlist_unref hls_master_playlist_unref
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void hls_master_playlist_unref (GstHLSMasterPlaylist * playlist);
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/* Time Mapping
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*
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* Used to map GStreamer times to internal segment timestamps
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*/
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struct _GstHLSTimeMap {
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/* DISCONT SEQUENCE NUMBER */
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gint64 dsn;
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/* The stream time (used for gst timestamps, gst segments, seeking ...) */
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GstClockTime stream_time;
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/* The optional Program Date Time reference */
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GDateTime *pdt;
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/* The internal time (ex: mpeg-ts PTS) */
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GstClockTime internal_time;
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};
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GstStreamType gst_stream_type_from_hls_type (GstHLSRenditionStreamType stype);
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GstStreamType gst_hls_get_stream_type_from_structure (GstStructure *structure);
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GstStreamType gst_hls_get_stream_type_from_caps (GstCaps *caps);
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G_END_DECLS
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#endif /* __M3U8_H__ */
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