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: Anssi Hannula <anssi.hannula@iki.fi>
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@ -220,7 +220,10 @@ static int spdif_header_dts4(AVFormatContext *s, AVPacket *pkt, int core_size,
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}
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ctx->out_bytes = sizeof(dtshd_start_code) + 2 + pkt_size;
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ctx->length_code = ctx->out_bytes;
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/* Align so that (length_code & 0xf) == 0x8. This is reportedly needed
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* with some receivers, but the exact requirement is unconfirmed. */
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ctx->length_code = FFALIGN(ctx->out_bytes + 0x8, 0x10) - 0x8;
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av_fast_malloc(&ctx->hd_buf, &ctx->hd_buf_size, ctx->out_bytes);
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if (!ctx->hd_buf)
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