From 1f7755917a0db1c6e4aa9ef9a194499d7e84e6fe Mon Sep 17 00:00:00 2001 From: Jan Schmidt Date: Thu, 15 Mar 2007 20:48:08 +0000 Subject: Port mpeg1videoparse to 0.10 and give it rank SECONDARY-1, so that it's below existing decoders. Original commit message from CVS: * configure.ac: * gst/mpeg1videoparse/Makefile.am: * gst/mpeg1videoparse/gstmp1videoparse.c: * gst/mpeg1videoparse/gstmp1videoparse.h: * gst/mpeg1videoparse/mp1videoparse.vcproj: * gst/mpegvideoparse/Makefile.am: * gst/mpegvideoparse/mpegpacketiser.c: (mpeg_packetiser_init), (mpeg_packetiser_free), (mpeg_packetiser_add_buf), (mpeg_packetiser_flush), (mpeg_find_start_code), (get_next_free_block), (complete_current_block), (append_to_current_block), (start_new_block), (handle_packet), (collect_packets), (mpeg_packetiser_handle_eos), (mpeg_packetiser_get_block), (mpeg_packetiser_next_block): * gst/mpegvideoparse/mpegpacketiser.h: * gst/mpegvideoparse/mpegvideoparse.c: (mpegvideoparse_get_type), (gst_mpegvideoparse_base_init), (gst_mpegvideoparse_class_init), (mpv_parse_reset), (gst_mpegvideoparse_init), (gst_mpegvideoparse_dispose), (set_par_from_dar), (set_fps_from_code), (mpegvideoparse_parse_seq), (gst_mpegvideoparse_time_code), (gst_mpegvideoparse_flush), (mpegvideoparse_drain_avail), (gst_mpegvideoparse_chain), (mpv_parse_sink_event), (gst_mpegvideoparse_change_state), (plugin_init): * gst/mpegvideoparse/mpegvideoparse.h: * gst/mpegvideoparse/mpegvideoparse.vcproj: Port mpeg1videoparse to 0.10 and give it rank SECONDARY-1, so that it's below existing decoders. Rename it to mpegvideoparse to reflect that it handles MPEG-1 and MPEG-2 now. Re-write the parsing code so that it collects packets differently and timestamps Picture packets correctly. Add a list of FIXME's at the top. --- gst/mpegvideoparse/mpegpacketiser.h | 116 ++++++++++++++++++++++++++++++++++++ 1 file changed, 116 insertions(+) create mode 100644 gst/mpegvideoparse/mpegpacketiser.h (limited to 'gst/mpegvideoparse/mpegpacketiser.h') diff --git a/gst/mpegvideoparse/mpegpacketiser.h b/gst/mpegvideoparse/mpegpacketiser.h new file mode 100644 index 00000000..202c6d9c --- /dev/null +++ b/gst/mpegvideoparse/mpegpacketiser.h @@ -0,0 +1,116 @@ +/* GStreamer + * Copyright (C) <2007> Jan Schmidt + * + * 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., 59 Temple Place - Suite 330, + * Boston, MA 02111-1307, USA. + */ +#ifndef __MPEGPACKETISER_H__ +#define __MPEGPACKETISER_H__ + +#include +#include + +typedef struct MPEGPacketiser MPEGPacketiser; +typedef struct MPEGBlockInfo MPEGBlockInfo; + +/* Packet ID codes for different packet types we + * care about */ +#define MPEG_PACKET_PICTURE 0x00 +#define MPEG_PACKET_SLICE_MIN 0x01 +#define MPEG_PACKET_SLICE_MAX 0xaf +#define MPEG_PACKET_SEQUENCE 0xb3 +#define MPEG_PACKET_EXTENSION 0xb5 +#define MPEG_PACKET_SEQUENCE_END 0xb7 +#define MPEG_PACKET_GOP 0xb8 +#define MPEG_PACKET_NONE 0xff + +/* Extension codes we care about */ +#define MPEG_PACKET_EXT_SEQUENCE 0x01 +#define MPEG_PACKET_EXT_SEQUENCE_DISPLAY 0x02 +#define MPEG_PACKET_EXT_QUANT_MATRIX 0x03 + +/* Flags indicating what type of packets are in this block, some are mutually + * exclusive though - ie, sequence packs are accumulated separately. GOP & + * Picture may occur together or separately */ +#define MPEG_BLOCK_FLAG_SEQUENCE 0x01 +#define MPEG_BLOCK_FLAG_PICTURE 0x02 +#define MPEG_BLOCK_FLAG_GOP 0x04 + +struct MPEGBlockInfo { + guint8 first_pack_type; + guint8 flags; + + guint64 offset; + guint32 length; + + GstClockTime ts; +}; + +struct MPEGPacketiser { + GstAdapter *adapter; + /* position in the adapter */ + guint64 adapter_offset; + + /* Sync word accumulator */ + guint32 sync_word; + + /* Offset since the last flush (unrelated to incoming buffer offsets) */ + guint64 tracked_offset; + + /* Number of picture packets currently collected */ + guint n_pictures; + + /* 2 sets of timestamps + offsets used to mark picture blocks + * The first is used when a sync word overlaps packet boundaries + * and comes from some buffer in the past. The next one comes from current + * buffer. These are only ever valid when handling streams from a demuxer, + * of course. */ + GstClockTime prev_buf_ts; + GstClockTime cur_buf_ts; + + /* MPEG id of the previous SEQUENCE, PICTURE or GOP packet. + MPEG_PACKET_NONE after a flush */ + guint8 prev_sync_packet; + + /* Indices into the blocks array. cur_block_idx is where we're writing and + indicates the end of the populated block entries. + first_block_idx is the read ptr. It may be -1 to indicate there are no + complete blocks available */ + gint cur_block_idx; + gint first_block_idx; + + /* An array of MPEGBlockInfo entries, used as a growable circular buffer + * indexed by cur_block_idx and bounded by last_block_idx */ + gint n_blocks; + MPEGBlockInfo *blocks; +}; + +guint8 *mpeg_find_start_code (guint32 *sync_word, guint8 *cur, guint8 *end); + +void mpeg_packetiser_init (MPEGPacketiser *p); +void mpeg_packetiser_free (MPEGPacketiser *p); + +void mpeg_packetiser_add_buf (MPEGPacketiser *p, GstBuffer *buf); +void mpeg_packetiser_handle_eos (MPEGPacketiser *p); + +void mpeg_packetiser_flush (MPEGPacketiser *p); + +/* Get the blockinfo and buffer for the block at the head of the queue */ +MPEGBlockInfo *mpeg_packetiser_get_block (MPEGPacketiser *p, GstBuffer **buf); + +/* Advance to the next data block */ +void mpeg_packetiser_next_block (MPEGPacketiser *p); + +#endif -- cgit v1.2.1