From:   rawoul@gmail.com
To:     linux-media@vger.kernel.org
Subject: [PATCH v2] edid-decode: parse additional flags in the DD+ Short Audio Descriptor
Date:   Wed, 24 Jul 2019 17:10:37 +0200
Message-Id: <20190724151037.36095-1-rawoul@gmail.com>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Sender: linux-media-owner@vger.kernel.org
Precedence: bulk

From: Arnaud Vrac <avrac@freebox.fr>

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 <avrac@freebox.fr>
---
 edid-decode.c | 5 +++++
 1 file changed, 5 insertions(+)

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

diff --git a/edid-decode.c b/edid-decode.c
index 940bcb5..197b78d 100644
--- a/edid-decode.c
+++ b/edid-decode.c
@@ -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)) {
-- 
2.20.1