[igt-dev] [PATCH i-g-t 1/2] lib/igt_infoframe: add support for AVI InfoFrames

[Simon Ser]

This commit adds partial support for AVI InfoFrames. Only bytes 1 and 2 of the
InfoFrame payload are parsed.

These bytes contain (among other things) information about the aspect ratio of
the frames.

Signed-off-by: Simon Ser <simon.ser at intel.com>
---
 lib/igt_infoframe.c | 30 ++++++++++++++++++++++++++++
 lib/igt_infoframe.h | 48 +++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 78 insertions(+)

diff --git a/lib/igt_infoframe.c b/lib/igt_infoframe.c
index 7e4fb45881a6..d8a2e609573c 100644
--- a/lib/igt_infoframe.c
+++ b/lib/igt_infoframe.c
@@ -27,6 +27,7 @@
 
 #include <string.h>
 
+#include "igt_core.h"
 #include "igt_infoframe.h"
 
 /**
@@ -61,6 +62,35 @@ static const int sample_sizes[] = {
 
 static const size_t sample_sizes_len = sizeof(sample_sizes) / sizeof(sample_sizes[0]);
 
+bool infoframe_avi_parse(struct infoframe_avi *infoframe, int version,
+			 const uint8_t *buf, size_t buf_size)
+{
+	memset(infoframe, 0, sizeof(*infoframe));
+
+	switch (version) {
+	case 2:
+	case 3:
+	case 4:
+		break; /* supported */
+	default:
+		igt_debug("Unsuppported AVI InfoFrame version: %d\n", version);
+		return false;
+	}
+
+	if (buf_size < 13)
+		return false;
+
+	infoframe->rgb_ycbcr = buf[0] >> 5;
+	infoframe->scan = buf[0] & 0x3;
+
+	infoframe->colorimetry = buf[1] >> 7;
+	infoframe->picture_aspect_ratio = (buf[1] >> 4) & 0x3;
+	infoframe->active_aspect_ratio = buf[1] & 0xF;
+	infoframe->vic = buf[3];
+
+	return true;
+}
+
 bool infoframe_audio_parse(struct infoframe_audio *infoframe, int version,
 			   const uint8_t *buf, size_t buf_size)
 {
diff --git a/lib/igt_infoframe.h b/lib/igt_infoframe.h
index 35daa3ea169d..056cdad6072a 100644
--- a/lib/igt_infoframe.h
+++ b/lib/igt_infoframe.h
@@ -32,6 +32,52 @@
 #include <stddef.h>
 #include <stdint.h>
 
+enum infoframe_avi_rgb_ycbcr {
+	INFOFRAME_AVI_RGB = 0,
+	INFOFRAME_AVI_YCBCR422 = 1,
+	INFOFRAME_AVI_YCBCR444 = 2,
+	INFOFRAME_AVI_YCBCR420 = 3,
+	INFOFRAME_AVI_IDO_DEFINED = 7,
+};
+
+enum infoframe_avi_scan {
+	INFOFRAME_AVI_SCAN_UNSPECIFIED = 0,
+	INFOFRAME_AVI_OVERSCAN = 1,
+	INFOFRAME_AVI_UNDERSCAN = 2,
+};
+
+enum infoframe_avi_colorimetry {
+	INFOFRAME_AVI_COLORIMETRY_UNSPECIFIED = 0,
+	INFOFRAME_AVI_SMPTE_170M = 1,
+	INFOFRAME_AVI_ITUR_BT709 = 2,
+	INFOFRAME_AVI_COLORIMETRY_EXTENDED = 3,
+};
+
+enum infoframe_avi_picture_aspect_ratio {
+	INFOFRAME_AVI_PIC_AR_UNSPECIFIED = 0,
+	INFOFRAME_AVI_PIC_AR_4_3 = 1,
+	INFOFRAME_AVI_PIC_AR_16_9 = 2,
+};
+
+enum infoframe_avi_active_aspect_ratio {
+	INFOFRAME_AVI_ACT_AR_PIC = 0, /* same as picture aspect ratio */
+	INFOFRAME_AVI_ACT_AR_4_3 = 9,
+	INFOFRAME_AVI_ACT_AR_16_9 = 10,
+	INFOFRAME_AVI_ACT_AR_14_9 = 11,
+};
+
+#define INFOFRAME_AVI_VIC_UNSPECIFIED 0
+
+struct infoframe_avi {
+	enum infoframe_avi_rgb_ycbcr rgb_ycbcr;
+	enum infoframe_avi_scan scan;
+	enum infoframe_avi_colorimetry colorimetry;
+	enum infoframe_avi_picture_aspect_ratio picture_aspect_ratio;
+	enum infoframe_avi_active_aspect_ratio active_aspect_ratio;
+	uint8_t vic; /* Video Identification Code */
+	/* TODO: remaining fields */
+};
+
 enum infoframe_audio_coding_type {
 	INFOFRAME_AUDIO_CT_UNSPECIFIED = 0, /* refer to stream header */
 	INFOFRAME_AUDIO_CT_PCM = 1, /* IEC 60958 PCM */
@@ -58,6 +104,8 @@ struct infoframe_audio {
 	/* TODO: speaker allocation */
 };
 
+bool infoframe_avi_parse(struct infoframe_avi *infoframe, int version,
+			 const uint8_t *buf, size_t buf_size);
 bool infoframe_audio_parse(struct infoframe_audio *infoframe, int version,
 			   const uint8_t *buf, size_t buf_size);
 
-- 
2.22.0