libmpdemux: add back demux_mpg

Apparently this was needed for good DVD playback.

This demuxer has been removed in 1fde09db6f4ce. All code added comes
from the revision before that. Some other bits have been removed in
later commits, and are added back as well.

Usage of memalign() is replaced by av_malloc(). As far as I can tell,
this memory is never free'd or reallocated, so no calls to av_free()
have been added.

The code re-added to video.c is plain horrible, full of code
duplication, full of demuxer/codecs specifics, but apparently needed.

Unrelated to re-adding the demuxer, re-add one codepath for
DEMUXER_TYPE_TV, which was accidentally removed in the same commit
demux_mpg was removed.

The closed captions decoder is not re-added.

1 files changed, 158 insertions, 0 deletions

diff --git a/libmpdemux/parse_es.c b/libmpdemux/parse_es.c
new file mode 100644
index 0000000000..05507a495a
--- /dev/null
+++ b/libmpdemux/parse_es.c
@@ -0,0 +1,158 @@
+/*
+ * MPEG-ES video parser
+ *
+ * This file is part of MPlayer.
+ *
+ * MPlayer is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * MPlayer 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with MPlayer; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+#include "config.h"
+#include "mp_msg.h"
+
+#include "stream/stream.h"
+#include "demuxer.h"
+#include "parse_es.h"
+
+//static unsigned char videobuffer[MAX_VIDEO_PACKET_SIZE];
+unsigned char* videobuffer=NULL;
+int videobuf_len=0;
+int next_nal = -1;
+///! legacy variable, 4 if stream is synced, 0 if not
+int videobuf_code_len=0;
+
+#define MAX_SYNCLEN (10 * 1024 * 1024)
+// sync video stream, and returns next packet code
+int sync_video_packet(demux_stream_t *ds){
+  if (!videobuf_code_len) {
+  int skipped=0;
+    if (!demux_pattern_3(ds, NULL, MAX_SYNCLEN, &skipped, 0x100)) {
+      if (skipped == MAX_SYNCLEN)
+      mp_msg(MSGT_DEMUXER, MSGL_ERR, "parse_es: could not sync video stream!\n");
+      goto eof_out;
+    }
+    next_nal = demux_getc(ds);
+    if (next_nal < 0)
+      goto eof_out;
+    videobuf_code_len = 4;
+  if(skipped) mp_dbg(MSGT_PARSEES,MSGL_DBG2,"videobuf: %d bytes skipped  (next: 0x1%02X)\n",skipped,next_nal);
+  }
+  return 0x100|next_nal;
+
+eof_out:
+  next_nal = -1;
+  videobuf_code_len = 0;
+  return 0;
+}
+
+// return: packet length
+int read_video_packet(demux_stream_t *ds){
+int packet_start;
+  int res, read;
+
+  if (VIDEOBUFFER_SIZE - videobuf_len < 5)
+    return 0;
+  // SYNC STREAM
+//  if(!sync_video_packet(ds)) return 0; // cannot sync (EOF)
+
+  // COPY STARTCODE:
+  packet_start=videobuf_len;
+  videobuffer[videobuf_len+0]=0;
+  videobuffer[videobuf_len+1]=0;
+  videobuffer[videobuf_len+2]=1;
+  videobuffer[videobuf_len+3]=next_nal;
+  videobuf_len+=4;
+
+  // READ PACKET:
+  res = demux_pattern_3(ds, &videobuffer[videobuf_len],
+          VIDEOBUFFER_SIZE - videobuf_len, &read, 0x100);
+  videobuf_len += read;
+  if (!res)
+    goto eof_out;
+
+  videobuf_len-=3;
+
+  mp_dbg(MSGT_PARSEES,MSGL_DBG2,"videobuf: packet 0x1%02X  len=%d  (total=%d)\n",videobuffer[packet_start+3],videobuf_len-packet_start,videobuf_len);
+
+  // Save next packet code:
+  next_nal = demux_getc(ds);
+  if (next_nal < 0)
+    goto eof_out;
+  videobuf_code_len=4;
+
+  return videobuf_len-packet_start;
+
+eof_out:
+  next_nal = -1;
+  videobuf_code_len = 0;
+  return videobuf_len - packet_start;
+}
+
+// return: next packet code
+int skip_video_packet(demux_stream_t *ds){
+
+  // SYNC STREAM
+//  if(!sync_video_packet(ds)) return 0; // cannot sync (EOF)
+
+  videobuf_code_len=0; // force resync
+
+  // SYNC AGAIN:
+  return sync_video_packet(ds);
+}
+
+/* stripped down version of a52_syncinfo() from liba52
+ * copyright belongs to Michel Lespinasse <walken@zoy.org>
+ * and Aaron Holtzman <aholtzma@ess.engr.uvic.ca> */
+int mp_a52_framesize(uint8_t * buf, int *srate)
+{
+    int rate[] = {  32,  40,  48,  56,  64,  80,  96, 112,
+                   128, 160, 192, 224, 256, 320, 384, 448,
+                   512, 576, 640
+    };
+    uint8_t halfrate[12] = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 2, 3 };
+    int frmsizecod, bitrate, half;
+
+    if ((buf[0] != 0x0b) || (buf[1] != 0x77))    /* syncword */
+        return 0;
+
+    if (buf[5] >= 0x60)                          /* bsid >= 12 */
+        return 0;
+
+    half = halfrate[buf[5] >> 3];
+
+    frmsizecod = buf[4] & 63;
+    if (frmsizecod >= 38)
+        return 0;
+
+    bitrate = rate[frmsizecod >> 1];
+
+    switch (buf[4] & 0xc0) {
+    case 0:    /* 48 KHz */
+        *srate = 48000 >> half;
+        return 4 * bitrate;
+    case 0x40: /* 44.1 KHz */
+        *srate = 44100 >> half;
+        return 2 * (320 * bitrate / 147 + (frmsizecod & 1));
+    case 0x80: /* 32 KHz */
+        *srate = 32000 >> half;
+        return 6 * bitrate;
+    }
+
+    return 0;
+}