Architecture for rendering high dynamic range video on enhanced dynamic range display devices

In a computer system, a method comprising:

• receiving an indication of a peak brightness of a target display device;
• determining that the peak brightness of the target display device is above a first peak brightness threshold and below a second peak brightness threshold, wherein the first peak brightness threshold is defined to be at or above a peak brightness of 100 nits, for a standard dynamic range (“SDR”) display device, and wherein the second peak brightness threshold is defined to be at or below a peak brightness of 4000 nits, for a high dynamic range (“HDR”) display device;
• selecting an HDR-to-enhanced dynamic range (“EDR”) tone mapping mode;
• receiving encoded data for HDR video;
• decoding the encoded data, thereby producing sample values of HDR video;
• and
• applying tone mapping to input values for the sample values of HDR video, according to a tone mapping function that is based at least in part on the peak brightness of the target display device, thereby producing output values for sample values of EDR video.

One or more computer-readable media storing computer-executable instructions for causing a computer system, when programmed thereby, to perform operations comprising:

• receiving an indication of a peak brightness of a target display device;
• determining that the peak brightness of the target display device is above a first peak brightness threshold and below a second peak brightness threshold, wherein the first peak brightness threshold is defined to be at or above a peak brightness of 100 nits, for a standard dynamic range (“SDR”) display device, and wherein the second peak brightness threshold is defined to be at or below a typical peak brightness of 4000 nits, for a high dynamic range (“HDR”) display device;
• selecting an HDR-to-enhanced dynamic range (“EDR”) tone mapping mode;
• receiving encoded data for HDR video;
• decoding the encoded data, thereby producing sample values of HDR video;
• and
• applying tone mapping to input values for the sample values of HDR video, according to a tone mapping function that is based at least in part on the peak brightness of the target display device, thereby producing output values for sample values of EDR video.