audio-set-id.rst (1190B)
1.. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later 2.. c:namespace:: DTV.audio 3 4.. _AUDIO_SET_ID: 5 6============ 7AUDIO_SET_ID 8============ 9 10Name 11---- 12 13AUDIO_SET_ID 14 15.. attention:: This ioctl is deprecated 16 17Synopsis 18-------- 19 20.. c:macro:: AUDIO_SET_ID 21 22``int ioctl(int fd, AUDIO_SET_ID, int id)`` 23 24Arguments 25--------- 26 27.. flat-table:: 28 :header-rows: 0 29 :stub-columns: 0 30 31 - 32 33 - int fd 34 35 - File descriptor returned by a previous call to open(). 36 37 - 38 39 - int id 40 41 - audio sub-stream id 42 43Description 44----------- 45 46This ioctl selects which sub-stream is to be decoded if a program or 47system stream is sent to the video device. If no audio stream type is 48set the id has to be in [0xC0,0xDF] for MPEG sound, in [0x80,0x87] for 49AC3 and in [0xA0,0xA7] for LPCM. More specifications may follow for 50other stream types. If the stream type is set the id just specifies the 51substream id of the audio stream and only the first 5 bits are 52recognized. 53 54Return Value 55------------ 56 57On success 0 is returned, on error -1 and the ``errno`` variable is set 58appropriately. The generic error codes are described at the 59:ref:`Generic Error Codes <gen-errors>` chapter.