edid-decode: parse additional flags in the DD+ Short Audio Descriptor

PATCH New [email protected] 1 participant 1 message Jul 24, 2019 Media (V4L/DVB)

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2019-07-24 15:10 UTC #0 lore raw

PATCH v2 1/1 edid-decode: parse additional flags in the DD+ Short Audio Descriptor

From: Arnaud Vrac <[email protected]>

In the Dolby Digital Plus Short Audio Descriptor, byte 3 is used to signal Joint Object Coding support, which can be useful to determine if the sink supports Dolby Atmos.

Parse these flags as described in the Dolby Audio and Dolby Atmos over HDMI specification v1.0. Other bits in byte 3 are marked as reserved and should be zero.

Signed-off-by Arnaud Vrac <[email protected]>

---
 edid-decode.c | 5 +++++
 1 file changed, 5 insertions(+)

Changes since v1: mention the document describing the dd+ flags

edid-decode.c +5 -0

index 940bcb5..197b78d 100644
@@ -1165,6 +1165,11 @@ static void cta_audio_block(const unsigned char *x, unsigned int length)
 			       (x[i+2] & 0x01) ? " 16" : "");
 		} else if (format <= 8) {
 			printf("      Maximum bit rate: %d kb/s\n", x[i+2] * 8);
+		} else if (format == 10) {
+			if(x[i+2] & 1)
+				printf("      Supports JOC\n");
+			if(x[i+2] & 2)
+				printf("      Supports JOC with ACMOD28\n");
 		} else if (format == 14) {
 			printf("      Profile: %d\n", x[i+2] & 7);
 		} else if (ext_format == 11 && (x[i+2] & 1)) {

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