Binaural rendering for headphones using metadata processing

1. A method, performed by an audio signal processing device, for generating a binaural rendering of digital audio content for playback through headphones, the method comprising:

receiving an encoded signal comprising the digital audio content and rendering metadata, wherein the digital audio content comprises a plurality of audio object signals and channel audio signals;

receiving playback control metadata comprising room model metadata, wherein the room model metadata comprises a frequency dependent reverberation time;

decoding the encoded signal to obtain the plurality of audio object signals and channel audio signals; and

generating the binaural rendering of the digital audio content in response to the plurality of audio object signals and channel audio signals, the rendering metadata, and the playback control metadata;

wherein the rendering metadata indicates, for each audio object signal, position and gain, and, for each channel audio signal, whether to use stereo instead of binaural rendering for the channel audio signal;

wherein, when the rendering metadata indicates, for a channel audio signal, to use stereo rendering for the channel audio signal, generating the binaural rendering of the digital audio content comprises, for the channel audio signal, generating a stereo rendering of the channel audio signal; and

wherein, when the rendering metadata indicates, for a channel audio signal, to use binaural rendering for the channel audio signal, generating the binaural rendering of the digital audio content comprises, for the channel audio signal, generating a binaural rendering of the channel audio signal.

2. An audio signal processing device for generating a binaural rendering of digital audio content for playback through headphones, the audio signal processing device comprising one or more processors to:

receive an encoded signal comprising the digital audio content and rendering metadata, wherein the digital audio content comprises a plurality of audio object signals and channel audio signals;

receive playback control metadata comprising room model metadata, wherein the room model metadata comprises a frequency dependent reverberation time;

decode the encoded signal to obtain the plurality of audio object signals and channel audio signals; and

generate the binaural rendering of the digital audio content in response to the plurality of audio object signals and channel audio signals, the rendering metadata, and the playback control metadata;

wherein the rendering metadata indicates, for each audio object signal, position and gain, and, for each channel audio signal, whether to use stereo instead of binaural rendering for the channel audio signal;

wherein, when the rendering metadata indicates, for a channel audio signal, to use stereo rendering for the channel audio signal, generating the binaural rendering of the digital audio content comprises, for the channel audio signal, generating a stereo rendering of the channel audio signal; and

wherein, when the rendering metadata indicates, for a channel audio signal, to use binaural rendering for the channel audio signal, generating the binaural rendering of the digital audio content comprises, for the channel audio signal, generating a binaural rendering of the channel audio signal.

3. A non-transitory computer readable storage medium comprising a sequence of instructions, which, when executed by an audio signal processing device, cause the audio signal processing device to perform a method for generating a binaural rendering of digital audio content for playback through headphones, the method comprising:

receiving an encoded signal comprising the digital audio content and rendering metadata, wherein the digital audio content comprises a plurality of audio object signals and channel audio signals;

receiving playback control metadata comprising room model metadata, wherein the room model metadata comprises a frequency dependent reverberation time;

decoding the encoded signal to obtain the plurality of audio object signals and channel audio signals; and

generating the binaural rendering of the digital audio content in response to the plurality of audio object signals and channel audio signals, the rendering metadata, and the playback control metadata;

wherein the rendering metadata indicates, for each audio object signal, position and gain, and, for each channel audio signal, whether to use stereo instead of binaural rendering for the channel audio signal;

wherein, when the rendering metadata indicates, for a channel audio signal, to use stereo rendering for the channel audio signal, generating the binaural rendering of the digital audio content comprises, for the channel audio signal, generating a stereo rendering of the channel audio signal; and

wherein, when the rendering metadata indicates, for a channel audio signal, to use binaural rendering for the channel audio signal, generating the binaural rendering of the digital audio content comprises, for the channel audio signal, generating a binaural rendering of the channel audio signal.