From 580bb779360e9832e3b5581e349f76bca75ada08 Mon Sep 17 00:00:00 2001
From: Anssi Hannula <anssi.hannula@iki.fi>
Date: Fri, 30 Dec 2011 22:48:18 +0200
Subject: [PATCH] spdifenc: use special alignment for DTS-HD length_code
Align IEC 61937 length_code for DTS-HD so that
(length_code & 0xf) == 0x8. This is reportedly needed with some
receivers.
Signed-off-by: Ronald S. Bultje <rsbultje@gmail.com>
---
libavformat/spdifenc.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/libavformat/spdifenc.c b/libavformat/spdifenc.c
index d541aba848a..5a1b8e4cb0f 100644
--- a/libavformat/spdifenc.c
+++ b/libavformat/spdifenc.c
@@ -220,7 +220,10 @@ static int spdif_header_dts4(AVFormatContext *s, AVPacket *pkt, int core_size,
}
ctx->out_bytes = sizeof(dtshd_start_code) + 2 + pkt_size;
- ctx->length_code = ctx->out_bytes;
+
+ /* Align so that (length_code & 0xf) == 0x8. This is reportedly needed
+ * with some receivers, but the exact requirement is unconfirmed. */
+ ctx->length_code = FFALIGN(ctx->out_bytes + 0x8, 0x10) - 0x8;
av_fast_malloc(&ctx->hd_buf, &ctx->hd_buf_size, ctx->out_bytes);
if (!ctx->hd_buf)
--
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