Method for outputting audio signal using scene orientation information in an audio decoder, and apparatus for outputting audio signal using the same
A method for outputting an audio signal corresponding to scene orientation information is disclosed. The method includes receiving an audio signal interacting with a video, generating a decoded audio signal, object metadata, and scene orientation information through decoding, receiving external control information, and generating modified object metadata suitable for a playback environment by modifying the object metadata based on the received external control information, rendering the decoded audio signal using the modified object metadata, and modifying the rendered audio signal according to the scene orientation information.
1. A method for decoding an audio bitstream by a decoding apparatus, the method comprising:
obtaining extension element configuration information from the audio bitstream;
based on the extension element configuration information indicating that scene orientation information is present in the audio bitstream, obtaining a decoded audio signal, object metadata, and the scene orientation information from the audio bitstream;
receiving external control information, and generating modified object metadata by modifying the object metadata based on the received external control information;
rendering the decoded audio signal using the modified object metadata; and
modifying the rendered audio signal based on the scene orientation information,
wherein the scene orientation information is information indicating a camera capture direction during generation of a video scene associated with the decoded audio signal.
2. The method according to claim 1 , wherein the scene orientation information is used for execution of a random access function for the video scene associated with the decoded audio signal.
3. The method according to claim 1 , wherein the scene orientation information includes yaw information, pitch information, and roll information,
the yaw information indicating an angle of rotating the camera capture direction in a z-axis,
the pitch information indicating an angle of rotating the camera capture direction in an x-axis, and
the roll information indicating an angle of rotating the camera capture direction in a y-axis.
4. The method according to claim 1 , wherein the modified object metadata includes a relative position of an audio object and a gain in a space corresponding to a user location.
5. The method according to claim 1 , further comprising performing binaural rendering on the rendered audio signal, using a Binaural Room Impulse Response (BRIR) to output the rendered audio signal as a 2-channel surround audio signal.
6. An apparatus for decoding an audio bitstream, the apparatus comprising:
an audio decoder configured to obtain extension element configuration information from the audio bitstream, and
based on the extension element configuration information indicating that scene orientation information is present in the audio bitstream, obtain a decoded audio signal, object metadata, and the scene orientation information from the audio bitstream;
a metadata processor configured to receive external control information, and generate modified object metadata by modifying the object metadata based on the received external control information; and
a renderer configured to render the decoded audio signal using the modified object metadata,
wherein the renderer modifies the rendered audio signal based on the scene orientation information, and
wherein the scene orientation information is information indicating a camera capture direction during generation of a video scene associated with the decoded audio signal.
7. The apparatus according to claim 6 , wherein the scene orientation information is used for execution of a random access function for the video scene associated with the decoded audio signal.
8. The apparatus according to claim 6 , wherein the scene orientation information includes yaw information, pitch information, and roll information,
the yaw information indicating an angle of rotating the camera capture direction in a z-axis,
the pitch information indicating an angle of rotating the camera capture direction in an x-axis, and
the roll information indicating an angle of rotating the camera capture direction in a y-axis.
9. The apparatus according to claim 6 , wherein the modified object metadata includes a relative position of an audio object and a gain in a space corresponding to a user location.
10. The apparatus according to claim 6 , further comprising a binaural renderer configured to perform binaural rendering on the rendered audio signal, using a Binaural Room Impulse Response (BRIR) to output the rendered audio signal as a 2-channel surround audio signal.