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https://gitlab.freedesktop.org/gstreamer/gstreamer.git
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e5f1cdd0e9
This reverts commit 2271608c43.
This patch needs more work so it doesn't cause grave playback
regressions (multi-second freezes) with some files that have
slightly broken timestamps but play fine everywhere else.
https://bugzilla.gnome.org/show_bug.cgi?id=636279
https://bugzilla.gnome.org/show_bug.cgi?id=632222
153 lines
4.7 KiB
C
153 lines
4.7 KiB
C
/* GStreamer
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* Copyright (C) <2007> Jan Schmidt <thaytan@mad.scientist.com>
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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., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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#ifndef __MPEGPACKETISER_H__
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#define __MPEGPACKETISER_H__
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#include <gst/gst.h>
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#include <gst/base/gstadapter.h>
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typedef struct MPEGPacketiser MPEGPacketiser;
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typedef struct MPEGBlockInfo MPEGBlockInfo;
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typedef struct MPEGSeqHdr MPEGSeqHdr;
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typedef struct MPEGPictureHdr MPEGPictureHdr;
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/* Packet ID codes for different packet types we
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* care about */
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#define MPEG_PACKET_PICTURE 0x00
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#define MPEG_PACKET_SLICE_MIN 0x01
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#define MPEG_PACKET_SLICE_MAX 0xaf
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#define MPEG_PACKET_SEQUENCE 0xb3
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#define MPEG_PACKET_EXTENSION 0xb5
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#define MPEG_PACKET_SEQUENCE_END 0xb7
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#define MPEG_PACKET_GOP 0xb8
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#define MPEG_PACKET_NONE 0xff
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/* Extension codes we care about */
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#define MPEG_PACKET_EXT_SEQUENCE 0x01
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#define MPEG_PACKET_EXT_SEQUENCE_DISPLAY 0x02
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#define MPEG_PACKET_EXT_QUANT_MATRIX 0x03
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/* Flags indicating what type of packets are in this block, some are mutually
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* exclusive though - ie, sequence packs are accumulated separately. GOP &
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* Picture may occur together or separately */
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#define MPEG_BLOCK_FLAG_SEQUENCE 0x01
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#define MPEG_BLOCK_FLAG_PICTURE 0x02
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#define MPEG_BLOCK_FLAG_GOP 0x04
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#define MPEG_PICTURE_TYPE_I 0x01
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#define MPEG_PICTURE_TYPE_P 0x02
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#define MPEG_PICTURE_TYPE_B 0x03
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#define MPEG_PICTURE_TYPE_D 0x04
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struct MPEGBlockInfo {
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guint8 first_pack_type;
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guint8 flags;
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guint64 offset;
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guint32 length;
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GstClockTime ts;
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};
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struct MPEGSeqHdr
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{
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/* 0 for unknown, else 1 or 2 */
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guint8 mpeg_version;
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/* Pixel-Aspect Ratio from DAR code via set_par_from_dar */
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gint par_w, par_h;
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/* Width and Height of the video */
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gint width, height;
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/* Framerate */
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gint fps_n, fps_d;
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/* Bitrate */
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guint bitrate;
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/* Profile and level */
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guint profile, level;
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gboolean progressive;
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};
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struct MPEGPictureHdr
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{
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guint8 pic_type;
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};
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struct MPEGPacketiser {
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GstAdapter *adapter;
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/* position in the adapter */
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guint64 adapter_offset;
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/* Sync word accumulator */
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guint32 sync_word;
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/* Offset since the last flush (unrelated to incoming buffer offsets) */
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guint64 tracked_offset;
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/* Number of picture packets currently collected */
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guint n_pictures;
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/* 2 sets of timestamps + offsets used to mark picture blocks
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* The first is used when a sync word overlaps packet boundaries
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* and comes from some buffer in the past. The next one comes from current
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* buffer. These are only ever valid when handling streams from a demuxer,
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* of course. */
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GstClockTime prev_buf_ts;
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GstClockTime cur_buf_ts;
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/* MPEG id of the previous SEQUENCE, PICTURE or GOP packet.
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MPEG_PACKET_NONE after a flush */
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guint8 prev_sync_packet;
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/* Indices into the blocks array. cur_block_idx is where we're writing and
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indicates the end of the populated block entries.
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first_block_idx is the read ptr. It may be -1 to indicate there are no
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complete blocks available */
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gint cur_block_idx;
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gint first_block_idx;
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/* An array of MPEGBlockInfo entries, used as a growable circular buffer
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* indexed by cur_block_idx and bounded by last_block_idx */
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gint n_blocks;
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MPEGBlockInfo *blocks;
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};
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void mpeg_packetiser_init (MPEGPacketiser *p);
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void mpeg_packetiser_free (MPEGPacketiser *p);
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void mpeg_packetiser_add_buf (MPEGPacketiser *p, GstBuffer *buf);
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void mpeg_packetiser_handle_eos (MPEGPacketiser *p);
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void mpeg_packetiser_flush (MPEGPacketiser *p);
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/* Get the blockinfo and buffer for the block at the head of the queue */
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MPEGBlockInfo *mpeg_packetiser_get_block (MPEGPacketiser *p, GstBuffer **buf);
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/* Advance to the next data block */
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void mpeg_packetiser_next_block (MPEGPacketiser *p);
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/* Utility functions for parsing MPEG packets */
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guint8 *mpeg_util_find_start_code (guint32 *sync_word,
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guint8 *cur, guint8 *end);
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gboolean mpeg_util_parse_sequence_hdr (MPEGSeqHdr *hdr,
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guint8 *data, guint8 *end);
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gboolean mpeg_util_parse_picture_hdr (MPEGPictureHdr *hdr,
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guint8 *data, guint8 *end);
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#endif
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