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b6abe94890
Somewhat working support for proceeding into the partial segments appearing at the live edge of the playlist. Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/3883>
256 lines
7.6 KiB
C
256 lines
7.6 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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* gsthlsdemux.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 __GST_HLS_DEMUX_H__
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#define __GST_HLS_DEMUX_H__
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#include <gst/gst.h>
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#include <gst/base/gstadapter.h>
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#include "m3u8.h"
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#include "gstisoff.h"
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#include "gstadaptivedemux.h"
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#if defined(HAVE_OPENSSL)
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#include <openssl/evp.h>
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#elif defined(HAVE_NETTLE)
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#include <nettle/aes.h>
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#include <nettle/cbc.h>
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#elif defined(HAVE_LIBGCRYPT)
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#include <gcrypt.h>
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#endif
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G_BEGIN_DECLS
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#define GST_TYPE_HLS_DEMUX2 \
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(gst_hls_demux2_get_type())
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#define GST_HLS_DEMUX(obj) \
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(G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_HLS_DEMUX2,GstHLSDemux))
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#define GST_HLS_DEMUX_CLASS(klass) \
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(G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_HLS_DEMUX2,GstHLSDemuxClass))
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#define GST_IS_HLS_DEMUX(obj) \
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(G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_HLS_DEMUX2))
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#define GST_IS_HLS_DEMUX_CLASS(klass) \
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(G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_HLS_DEMUX2))
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#define GST_HLS_DEMUX_GET_CLASS(obj) \
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(G_TYPE_INSTANCE_GET_CLASS ((obj),GST_TYPE_HLS_DEMUX2,GstHLSDemuxClass))
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#define GST_HLS_DEMUX_CAST(obj) \
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((GstHLSDemux *)obj)
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typedef struct _GstHLSDemux2 GstHLSDemux;
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typedef struct _GstHLSDemux2Class GstHLSDemuxClass;
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#define GST_TYPE_HLS_DEMUX_STREAM \
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(gst_hls_demux_stream_get_type())
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#define GST_HLS_DEMUX_STREAM(obj) \
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(G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_HLS_DEMUX_STREAM,GstHLSDemuxStream))
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#define GST_HLS_DEMUX_STREAM_CAST(obj) ((GstHLSDemuxStream *)obj)
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typedef struct _GstHLSDemuxStream GstHLSDemuxStream;
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typedef GstAdaptiveDemux2StreamClass GstHLSDemuxStreamClass;
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typedef enum {
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GST_HLS_PARSER_NONE,
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GST_HLS_PARSER_MPEGTS,
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GST_HLS_PARSER_ID3,
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GST_HLS_PARSER_WEBVTT,
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GST_HLS_PARSER_ISOBMFF
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} GstHLSParserType;
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typedef enum {
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/* More data is needed to parse the fragment */
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GST_HLS_PARSER_RESULT_NEED_MORE_DATA,
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/* An error happened, discard the fragment */
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GST_HLS_PARSER_RESULT_ERROR,
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/* Parsing suceeded, it no longer needs to be called for the fragment */
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GST_HLS_PARSER_RESULT_DONE,
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/* The fragment wasn't the expected one. Current data must be dropped and
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* GST_ADAPTIVE_DEMUX_FLOW_RESTART_FRAGMENT returned to the parent class */
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GST_HLS_PARSER_RESULT_RESYNC
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} GstHLSParserResult;
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struct _GstHLSDemuxStream
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{
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GstAdaptiveDemux2Stream adaptive_demux_stream;
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/* A stream either variants or renditions */
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gboolean is_variant;
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/* Rendition-specific fields */
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GstStreamType rendition_type; /* FIXME: Also used by variant streams */
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gchar *lang;
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gchar *name;
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GstHLSRenditionStream *current_rendition;
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/* rendition to switch to */
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GstHLSRenditionStream *pending_rendition;
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/* End of Rendition-specific fields */
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/* Whether the underlying playlist was fetched on creation */
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gboolean playlist_fetched;
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/* The media playlist currently used */
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GstHLSMediaPlaylist *playlist;
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/* The current header / init_file data */
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GstM3U8InitFile *init_file;
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/* The segment (from the above playlist) currently being used */
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GstM3U8MediaSegment *current_segment;
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/* When playing partial segments in LL-HLS, in_partial_segments is TRUE,
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* and part_no is the current part index in the current_segment */
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gboolean in_partial_segments;
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guint part_idx;
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/* Whether we need to typefind the next buffer */
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gboolean do_typefind;
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/* for collecting data until typefind succeeds */
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GstBuffer *pending_typefind_buffer;
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/* for chunking data into 16 byte multiples for decryption */
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GstAdapter *pending_encrypted_data;
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/* last decrypted buffer for pkcs7 unpadding. We only know that it is the last
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* on ::finish_fragment() */
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GstBuffer *pending_decrypted_buffer;
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/* Current offset (in bytes) in fragment data we pushed downstream. Resets to
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* -1 at every fragment start */
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guint64 current_offset;
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gboolean reset_pts;
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/* decryption tooling */
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#if defined(HAVE_OPENSSL)
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# if OPENSSL_VERSION_NUMBER < 0x10100000L
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EVP_CIPHER_CTX aes_ctx;
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# else
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EVP_CIPHER_CTX *aes_ctx;
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# endif
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#elif defined(HAVE_NETTLE)
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struct CBC_CTX (struct aes128_ctx, AES_BLOCK_SIZE) aes_ctx;
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#elif defined(HAVE_LIBGCRYPT)
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gcry_cipher_hd_t aes_ctx;
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#endif
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gchar *current_key;
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guint8 *current_iv;
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/* The type of parser used for data handling */
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GstHLSParserType parser_type;
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/* Is content processing required ? */
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gboolean process_buffer_content;
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/* Data to be analyzed by */
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GstBuffer *pending_segment_data;
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/* TRUE if pending_segment_data contains data from a header/index */
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gboolean pending_data_is_header;
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/* ISOBMFF */
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GstMoovBox *moov;
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/* Presentation offset to use and report. This value will be appended to all
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* "output" stream times. Not enabled (i.e 0) if variant is ISOBMFF
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*/
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GstClockTime presentation_offset;
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gboolean pdt_tag_sent;
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};
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typedef struct {
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guint8 data[16];
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} GstHLSKey;
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/**
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* GstHLSDemux:
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*
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* Opaque #GstHLSDemux data structure.
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*/
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struct _GstHLSDemux2
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{
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GstAdaptiveDemux parent;
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/* Initial bitrate to use before any bandwidth measurement */
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guint start_bitrate;
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/* Decryption key cache: url => GstHLSKey */
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GHashTable *keys;
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GMutex keys_lock;
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/* FIXME: check locking, protected automatically by manifest_lock already? */
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/* The master playlist with the available variant streams */
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GstHLSMasterPlaylist *master;
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GstHLSVariantStream *current_variant;
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/* The variant to switch to */
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GstHLSVariantStream *pending_variant;
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GstHLSDemuxStream *main_stream;
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/* Time Mappings (GstHLSTimeMap) */
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GList *mappings;
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};
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struct _GstHLSDemux2Class
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{
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GstAdaptiveDemuxClass parent_class;
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};
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gchar *gst_hls_buf_to_utf8_text (GstBuffer * buf);
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/* Private */
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GstHLSParserResult gst_hlsdemux_handle_content_mpegts (GstHLSDemux *demux,
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GstHLSDemuxStream *hls_stream,
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gboolean draining,
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GstBuffer **buffer);
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GstHLSParserResult gst_hlsdemux_handle_content_id3 (GstHLSDemux *demux,
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GstHLSDemuxStream *hls_stream,
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gboolean draining,
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GstBuffer **buffer);
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GstHLSParserResult gst_hlsdemux_handle_content_isobmff (GstHLSDemux *demux,
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GstHLSDemuxStream *hls_stream,
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gboolean draining,
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GstBuffer **buffer);
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GstHLSParserResult gst_hlsdemux_handle_content_webvtt (GstHLSDemux *demux,
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GstHLSDemuxStream *hls_stream,
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gboolean draining,
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GstBuffer **buffer);
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GstHLSParserResult gst_hlsdemux_handle_internal_time (GstHLSDemux *demux,
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GstHLSDemuxStream *hls_stream,
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GstClockTime internal_time);
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GstClockTimeDiff gst_hls_internal_to_stream_time (GstHLSTimeMap *map,
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GstClockTime internal_time);
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GstHLSTimeMap *gst_hls_find_time_map (GstHLSDemux * demux, gint64 dsn);
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GType gst_hls_demux2_get_type (void);
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GType gst_hls_demux_stream_get_type (void);
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G_END_DECLS
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#endif /* __GST_HLS_DEMUX_H__ */
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