v4l2 demux: add colorimetry infos

modules/access/v4l2/demux.c

@@ -404,6 +404,140 @@ static int InitVideo (demux_t *demux, int fd, uint32_t caps)
     es_fmt.video.i_frame_rate_base = parm.parm.capture.timeperframe.numerator;
     GetAR (fd, &es_fmt.video.i_sar_num, &es_fmt.video.i_sar_den);
 
+    msg_Dbg (demux, "color primaries: %u", fmt.fmt.pix.colorspace);
+    switch (fmt.fmt.pix.colorspace)
+    {
+        case V4L2_COLORSPACE_DEFAULT:
+            break;
+        case V4L2_COLORSPACE_SMPTE170M:
+            es_fmt.video.primaries = COLOR_PRIMARIES_BT601_525;
+            es_fmt.video.transfer = TRANSFER_FUNC_BT709;
+            es_fmt.video.space = COLOR_SPACE_BT601;
+            break;
+        case V4L2_COLORSPACE_SMPTE240M: /* not supported */
+            break;
+        case V4L2_COLORSPACE_REC709:
+            es_fmt.video.primaries = COLOR_PRIMARIES_BT709;
+            es_fmt.video.transfer = TRANSFER_FUNC_BT709;
+            es_fmt.video.space = COLOR_SPACE_BT709;
+            break;
+        case V4L2_COLORSPACE_470_SYSTEM_M:
+            es_fmt.video.transfer = TRANSFER_FUNC_BT709;
+            es_fmt.video.space = COLOR_SPACE_BT601;
+            break;
+        case V4L2_COLORSPACE_470_SYSTEM_BG:
+            es_fmt.video.primaries = COLOR_PRIMARIES_BT601_625;
+            es_fmt.video.transfer = TRANSFER_FUNC_BT709;
+            es_fmt.video.space = COLOR_SPACE_BT601;
+            break;
+        case V4L2_COLORSPACE_JPEG:
+            es_fmt.video.primaries = COLOR_PRIMARIES_SRGB;
+            es_fmt.video.transfer = TRANSFER_FUNC_SRGB;
+            es_fmt.video.space = COLOR_SPACE_BT601;
+            es_fmt.video.b_color_range_full = true;
+            break;
+        case V4L2_COLORSPACE_SRGB:
+            es_fmt.video.primaries = COLOR_PRIMARIES_SRGB;
+            es_fmt.video.transfer = TRANSFER_FUNC_SRGB;
+            es_fmt.video.space = COLOR_SPACE_UNDEF; /* sYCC unsupported */
+            break;
+        case V4L2_COLORSPACE_ADOBERGB: /* not supported */
+            es_fmt.video.space = COLOR_SPACE_BT601;
+            break;
+        case V4L2_COLORSPACE_BT2020:
+            es_fmt.video.primaries = COLOR_PRIMARIES_BT2020;
+            es_fmt.video.transfer = TRANSFER_FUNC_BT2020;
+            es_fmt.video.space = COLOR_SPACE_BT2020;
+            break;
+        case V4L2_COLORSPACE_RAW:
+            es_fmt.video.transfer = TRANSFER_FUNC_LINEAR;
+            break;
+        case V4L2_COLORSPACE_DCI_P3:
+            es_fmt.video.primaries = COLOR_PRIMARIES_DCI_P3;
+            es_fmt.video.transfer = TRANSFER_FUNC_UNDEF;
+            es_fmt.video.space = COLOR_SPACE_BT2020;
+            break;
+        default:
+            msg_Warn (demux, "unknown color space %u", fmt.fmt.pix.colorspace);
+            break;
+    }
+
+    msg_Dbg (demux, "transfer function: %u", fmt.fmt.pix.xfer_func);
+    switch (fmt.fmt.pix.xfer_func)
+    {
+        case V4L2_XFER_FUNC_DEFAULT:
+            /* If transfer function is default, the transfer function is
+             * inferred from the colorspace value for backward compatibility.
+             * See V4L2 documentation for details. */
+            break;
+        case V4L2_XFER_FUNC_709:
+            es_fmt.video.transfer = TRANSFER_FUNC_BT709;
+            break;
+        case V4L2_XFER_FUNC_SRGB:
+            es_fmt.video.transfer = TRANSFER_FUNC_SRGB;
+            break;
+        case V4L2_XFER_FUNC_ADOBERGB:
+        case V4L2_XFER_FUNC_SMPTE240M:
+            es_fmt.video.transfer = TRANSFER_FUNC_UNDEF;
+            break;
+        case V4L2_XFER_FUNC_NONE:
+            es_fmt.video.transfer = TRANSFER_FUNC_LINEAR;
+            break;
+        case V4L2_XFER_FUNC_DCI_P3:
+        case V4L2_XFER_FUNC_SMPTE2084:
+            es_fmt.video.transfer = TRANSFER_FUNC_UNDEF;
+            break;
+        default:
+            msg_Warn (demux, "unknown transfer function %u",
+                      fmt.fmt.pix.xfer_func);
+            break;
+    }
+
+    msg_Dbg (demux, "YCbCr encoding: %u", fmt.fmt.pix.ycbcr_enc);
+    switch (fmt.fmt.pix.ycbcr_enc)
+    {
+        case V4L2_YCBCR_ENC_DEFAULT:
+            /* Same as transfer function - use color space value */
+            break;
+        case V4L2_YCBCR_ENC_601:
+            es_fmt.video.space = COLOR_SPACE_BT601;
+            break;
+        case V4L2_YCBCR_ENC_709:
+            es_fmt.video.space = COLOR_SPACE_BT709;
+            break;
+        case V4L2_YCBCR_ENC_XV601:
+        case V4L2_YCBCR_ENC_XV709:
+        case V4L2_YCBCR_ENC_SYCC:
+            break;
+        case V4L2_YCBCR_ENC_BT2020:
+            es_fmt.video.space = COLOR_SPACE_BT2020;
+            break;
+        case V4L2_YCBCR_ENC_BT2020_CONST_LUM:
+        case V4L2_YCBCR_ENC_SMPTE240M:
+            break;
+        default:
+            msg_Err (demux, "unknown YCbCr encoding: %u",
+                     fmt.fmt.pix.ycbcr_enc);
+            break;
+    }
+
+    msg_Dbg (demux, "quantization: %u", fmt.fmt.pix.quantization);
+    switch (fmt.fmt.pix.quantization)
+    {
+        case V4L2_QUANTIZATION_DEFAULT:
+            break;
+        case V4L2_QUANTIZATION_FULL_RANGE:
+            es_fmt.video.b_color_range_full = true;
+            break;
+        case V4L2_QUANTIZATION_LIM_RANGE:
+            es_fmt.video.b_color_range_full = false;
+            break;
+        default:
+            msg_Err (demux, "unknown quantization: %u",
+                     fmt.fmt.pix.quantization);
+            break;
+    }
+
     msg_Dbg (demux, "added new video ES %4.4s %ux%u (%ux%u)",
              (char *)&es_fmt.i_codec,
              es_fmt.video.i_visible_width, es_fmt.video.i_visible_height,