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.

1 files changed, 116 insertions, 0 deletions

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 <thaytan@mad.scientist.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., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+#ifndef __MPEGPACKETISER_H__
+#define __MPEGPACKETISER_H__
+
+#include <gst/gst.h>
+#include <gst/base/gstadapter.h>
+
+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