lavf/mlpdec: Simplify mlp/thd probe function.

Move the demuxers into their own file.

1 files changed, 85 insertions, 0 deletions

diff --git a/libavformat/mlpdec.c b/libavformat/mlpdec.c
new file mode 100644
index 0000000000..2cce506d48
--- /dev/null
+++ b/libavformat/mlpdec.c
@@ -0,0 +1,85 @@
+/*
+ * MLP and TrueHD demuxer
+ * Copyright (c) 2001 Fabrice Bellard
+ * Copyright (c) 2005 Alex Beregszaszi
+ * Copyright (c) 2015 Carl Eugen Hoyos
+ *
+ * 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 "avformat.h"
+#include "rawdec.h"
+#include "libavutil/intreadwrite.h"
+
+static int av_always_inline mlp_thd_probe(AVProbeData *p, uint32_t sync)
+{
+    const uint8_t *buf, *last_buf = p->buf, *end = p->buf + p->buf_size;
+    int frames = 0, valid = 0, size = 0;
+
+    for (buf = p->buf; buf + 8 <= end; buf++) {
+        if (AV_RB32(buf + 4) == sync) {
+            frames++;
+            if (last_buf + size == buf) {
+                valid++;
+            }
+            last_buf = buf;
+            size = (AV_RB16(buf) & 0xfff) * 2;
+        } else if (buf - last_buf == size) {
+            size += (AV_RB16(buf) & 0xfff) * 2;
+        }
+    }
+    if (valid >= 100)
+        return AVPROBE_SCORE_MAX;
+    return 0;
+}
+
+#if CONFIG_MLP_DEMUXER
+static int mlp_probe(AVProbeData *p)
+{
+    return mlp_thd_probe(p, 0xf8726fbb);
+}
+
+AVInputFormat ff_mlp_demuxer = {
+    .name           = "mlp",
+    .long_name      = NULL_IF_CONFIG_SMALL("raw MLP"),
+    .read_probe     = mlp_probe,
+    .read_header    = ff_raw_audio_read_header,
+    .read_packet    = ff_raw_read_partial_packet,
+    .flags          = AVFMT_GENERIC_INDEX | AVFMT_NOTIMESTAMPS,
+    .extensions     = "mlp",
+    .raw_codec_id   = AV_CODEC_ID_MLP,
+};
+#endif
+
+#if CONFIG_TRUEHD_DEMUXER
+static int thd_probe(AVProbeData *p)
+{
+    return mlp_thd_probe(p, 0xf8726fba);
+}
+
+AVInputFormat ff_truehd_demuxer = {
+    .name           = "truehd",
+    .long_name      = NULL_IF_CONFIG_SMALL("raw TrueHD"),
+    .read_probe     = thd_probe,
+    .read_header    = ff_raw_audio_read_header,
+    .read_packet    = ff_raw_read_partial_packet,
+    .flags          = AVFMT_GENERIC_INDEX | AVFMT_NOTIMESTAMPS,
+    .extensions     = "thd",
+    .raw_codec_id   = AV_CODEC_ID_TRUEHD,
+};
+#endif
+