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spdifenc: use special alignment for DTS-HD length_code

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Align IEC 61937 length_code for DTS-HD so that
(length_code & 0xf) == 0x8. This is reportedly needed with some
receivers.

Signed-off-by: Anssi Hannula <anssi.hannula@iki.fi>
This commit is contained in:
Anssi Hannula 2011-10-28 13:43:13 +03:00
parent 3c32a941b7
commit ab9c00b992
1 changed files with 4 additions and 1 deletions
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5
libavformat/spdifenc.c
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@ -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)