ffmpeg source update for sep 09

source/patched-ffmpeg-mt/libavformat/dtsdec.c

+/*
+ * RAW DTS demuxer
+ * Copyright (c) 2008 Benjamin Larsson
+ *
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include "libavcodec/bytestream.h"
+#include "avformat.h"
+#include "rawdec.h"
+
+#define DCA_MARKER_14B_BE 0x1FFFE800
+#define DCA_MARKER_14B_LE 0xFF1F00E8
+#define DCA_MARKER_RAW_BE 0x7FFE8001
+#define DCA_MARKER_RAW_LE 0xFE7F0180
+
+static int dts_probe(AVProbeData *p)
+{
+    const uint8_t *buf, *bufp;
+    uint32_t state = -1;
+    int markers[3] = {0};
+    int sum, max;
+
+    buf = p->buf;
+
+    for(; buf < (p->buf+p->buf_size)-2; buf+=2) {
+        bufp = buf;
+        state = (state << 16) | bytestream_get_be16(&bufp);
+
+        /* regular bitstream */
+        if (state == DCA_MARKER_RAW_BE || state == DCA_MARKER_RAW_LE)
+            markers[0]++;
+
+        /* 14 bits big-endian bitstream */
+        if (state == DCA_MARKER_14B_BE)
+            if ((bytestream_get_be16(&bufp) & 0xFFF0) == 0x07F0)
+                markers[1]++;
+
+        /* 14 bits little-endian bitstream */
+        if (state == DCA_MARKER_14B_LE)
+            if ((bytestream_get_be16(&bufp) & 0xF0FF) == 0xF007)
+                markers[2]++;
+    }
+    sum = markers[0] + markers[1] + markers[2];
+    max = markers[1] > markers[0];
+    max = markers[2] > markers[max] ? 2 : max;
+    if (markers[max] > 3 && p->buf_size / markers[max] < 32*1024 &&
+        markers[max] * 4 > sum * 3)
+        return AVPROBE_SCORE_MAX/2+1;
+
+    return 0;
+}
+
+AVInputFormat dts_demuxer = {
+    "dts",
+    NULL_IF_CONFIG_SMALL("raw DTS"),
+    0,
+    dts_probe,
+    ff_raw_audio_read_header,
+    ff_raw_read_partial_packet,
+    .flags= AVFMT_GENERIC_INDEX,
+    .extensions = "dts",
+    .value = CODEC_ID_DTS,
+};