gstreamer/subprojects/gst-plugins-good/gst/audioparsers/gstmpegaudioparse.h
Carlos Rafael Giani 0431a0845c mpegaudioparse: Support gapless playback
Gapless playback is handled by adjusting buffer timestamps & durations
and by adding GstAudioClippingMeta.

Support for "Frankenstein" streams (= poorly stitched together streams)
is also added, so that gapless playback support doesn't prevent those
from being properly played.

Co-authored-by: Sebastian Dröge <sebastian@centricular.com>
Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/1028>
2022-03-14 10:32:15 +02:00

130 lines
3.7 KiB
C

/* GStreamer MPEG audio parser
* Copyright (C) 2006-2007 Jan Schmidt <thaytan@mad.scientist.com>
* Copyright (C) 2010 Mark Nauwelaerts <mnauw users sf net>
* Copyright (C) 2010 Nokia Corporation. All rights reserved.
* Contact: Stefan Kost <stefan.kost@nokia.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#ifndef __GST_MPEG_AUDIO_PARSE_H__
#define __GST_MPEG_AUDIO_PARSE_H__
#include <gst/gst.h>
#include <gst/base/gstbaseparse.h>
G_BEGIN_DECLS
#define GST_TYPE_MPEG_AUDIO_PARSE \
(gst_mpeg_audio_parse_get_type())
#define GST_MPEG_AUDIO_PARSE(obj) \
(G_TYPE_CHECK_INSTANCE_CAST((obj), GST_TYPE_MPEG_AUDIO_PARSE, GstMpegAudioParse))
#define GST_MPEG_AUDIO_PARSE_CLASS(klass) \
(G_TYPE_CHECK_CLASS_CAST((klass), GST_TYPE_MPEG_AUDIO_PARSE, GstMpegAudioParseClass))
#define GST_IS_MPEG_AUDIO_PARSE(obj) \
(G_TYPE_CHECK_INSTANCE_TYPE((obj), GST_TYPE_MPEG_AUDIO_PARSE))
#define GST_IS_MPEG_AUDIO_PARSE_CLASS(klass) \
(G_TYPE_CHECK_CLASS_TYPE((klass), GST_TYPE_MPEG_AUDIO_PARSE))
typedef struct _GstMpegAudioParse GstMpegAudioParse;
typedef struct _GstMpegAudioParseClass GstMpegAudioParseClass;
/**
* GstMpegAudioParse:
*
* The opaque GstMpegAudioParse object
*/
struct _GstMpegAudioParse {
GstBaseParse baseparse;
/*< private >*/
GstFormat upstream_format;
gint rate;
gint channels;
gint layer;
gint version;
GstClockTime max_bitreservoir;
/* Samples per frame */
gint spf;
GstClockTime frame_duration;
gint freerate;
gboolean sent_codec_tag;
guint last_posted_bitrate;
gint last_posted_crc, last_crc;
guint last_posted_channel_mode, last_mode;
gboolean outgoing_frame_is_xing_header;
/* Bitrate from non-vbr headers */
guint32 hdr_bitrate;
gboolean bitrate_is_constant;
/* Xing info */
guint32 xing_flags;
guint32 xing_frames;
GstClockTime xing_total_time;
GstClockTime xing_actual_total_time;
guint32 xing_bytes;
/* percent -> filepos mapping */
guchar xing_seek_table[100];
/* filepos -> percent mapping */
guint16 xing_seek_table_inverse[256];
guint32 xing_vbr_scale;
guint xing_bitrate;
/* VBRI info */
guint32 vbri_frames;
GstClockTime vbri_total_time;
guint32 vbri_bytes;
guint vbri_bitrate;
guint vbri_seek_points;
guint32 *vbri_seek_table;
gboolean vbri_valid;
/* LAME info */
guint32 encoder_delay;
guint32 encoder_padding;
/* Gapless playback states */
guint32 decoder_delay;
guint64 start_of_actual_samples;
guint64 end_of_actual_samples;
GstClockTime start_padding_time;
GstClockTime end_padding_time;
GstClockTime total_padding_time;
};
/**
* GstMpegAudioParseClass:
* @parent_class: Element parent class.
*
* The opaque GstMpegAudioParseClass data structure.
*/
struct _GstMpegAudioParseClass {
GstBaseParseClass baseparse_class;
};
GType gst_mpeg_audio_parse_get_type (void);
G_END_DECLS
#endif /* __GST_MPEG_AUDIO_PARSE_H__ */