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diff --git a/Documentation/DocBook/media/dvb/audio.xml b/Documentation/DocBook/media/dvb/audio.xml new file mode 100644 index 00000000..d6438623 --- /dev/null +++ b/Documentation/DocBook/media/dvb/audio.xml @@ -0,0 +1,1203 @@ +<title>DVB Audio Device</title> +<para>The DVB audio device controls the MPEG2 audio decoder of the DVB hardware. It +can be accessed through <emphasis role="tt">/dev/dvb/adapter0/audio0</emphasis>. Data types and and +ioctl definitions can be accessed by including <emphasis role="tt">linux/dvb/video.h</emphasis> in your +application. +</para> +<para>Please note that some DVB cards don’t have their own MPEG decoder, which results in +the omission of the audio and video device. +</para> + +<section id="audio_data_types"> +<title>Audio Data Types</title> +<para>This section describes the structures, data types and defines used when talking to the +audio device. +</para> + +<section id="audio-stream-source-t"> +<title>audio_stream_source_t</title> +<para>The audio stream source is set through the AUDIO_SELECT_SOURCE call and can take +the following values, depending on whether we are replaying from an internal (demux) or +external (user write) source. +</para> +<programlisting> +typedef enum { + AUDIO_SOURCE_DEMUX, + AUDIO_SOURCE_MEMORY +} audio_stream_source_t; +</programlisting> +<para>AUDIO_SOURCE_DEMUX selects the demultiplexer (fed either by the frontend or the +DVR device) as the source of the video stream. If AUDIO_SOURCE_MEMORY +is selected the stream comes from the application through the <emphasis role="tt">write()</emphasis> system +call. +</para> + +</section> +<section id="audio-play-state-t"> +<title>audio_play_state_t</title> +<para>The following values can be returned by the AUDIO_GET_STATUS call representing the +state of audio playback. +</para> +<programlisting> +typedef enum { + AUDIO_STOPPED, + AUDIO_PLAYING, + AUDIO_PAUSED +} audio_play_state_t; +</programlisting> + +</section> +<section id="audio-channel-select-t"> +<title>audio_channel_select_t</title> +<para>The audio channel selected via AUDIO_CHANNEL_SELECT is determined by the +following values. +</para> +<programlisting> +typedef enum { + AUDIO_STEREO, + AUDIO_MONO_LEFT, + AUDIO_MONO_RIGHT, + AUDIO_MONO, + AUDIO_STEREO_SWAPPED +} audio_channel_select_t; +</programlisting> + +</section> +<section id="audio-status"> +<title>struct audio_status</title> +<para>The AUDIO_GET_STATUS call returns the following structure informing about various +states of the playback operation. +</para> +<programlisting> +typedef struct audio_status { + boolean AV_sync_state; + boolean mute_state; + audio_play_state_t play_state; + audio_stream_source_t stream_source; + audio_channel_select_t channel_select; + boolean bypass_mode; + audio_mixer_t mixer_state; +} audio_status_t; +</programlisting> + +</section> +<section id="audio-mixer"> +<title>struct audio_mixer</title> +<para>The following structure is used by the AUDIO_SET_MIXER call to set the audio +volume. +</para> +<programlisting> +typedef struct audio_mixer { + unsigned int volume_left; + unsigned int volume_right; +} audio_mixer_t; +</programlisting> + +</section> +<section id="audio_encodings"> +<title>audio encodings</title> +<para>A call to AUDIO_GET_CAPABILITIES returns an unsigned integer with the following +bits set according to the hardwares capabilities. +</para> +<programlisting> + #define AUDIO_CAP_DTS 1 + #define AUDIO_CAP_LPCM 2 + #define AUDIO_CAP_MP1 4 + #define AUDIO_CAP_MP2 8 + #define AUDIO_CAP_MP3 16 + #define AUDIO_CAP_AAC 32 + #define AUDIO_CAP_OGG 64 + #define AUDIO_CAP_SDDS 128 + #define AUDIO_CAP_AC3 256 +</programlisting> + +</section> +<section id="audio-karaoke"> +<title>struct audio_karaoke</title> +<para>The ioctl AUDIO_SET_KARAOKE uses the following format: +</para> +<programlisting> +typedef +struct audio_karaoke { + int vocal1; + int vocal2; + int melody; +} audio_karaoke_t; +</programlisting> +<para>If Vocal1 or Vocal2 are non-zero, they get mixed into left and right t at 70% each. If both, +Vocal1 and Vocal2 are non-zero, Vocal1 gets mixed into the left channel and Vocal2 into the +right channel at 100% each. Ff Melody is non-zero, the melody channel gets mixed into left +and right. +</para> + +</section> +<section id="audio-attributes-t"> +<title>audio attributes</title> +<para>The following attributes can be set by a call to AUDIO_SET_ATTRIBUTES: +</para> +<programlisting> + typedef uint16_t audio_attributes_t; + /⋆ bits: descr. ⋆/ + /⋆ 15-13 audio coding mode (0=ac3, 2=mpeg1, 3=mpeg2ext, 4=LPCM, 6=DTS, ⋆/ + /⋆ 12 multichannel extension ⋆/ + /⋆ 11-10 audio type (0=not spec, 1=language included) ⋆/ + /⋆ 9- 8 audio application mode (0=not spec, 1=karaoke, 2=surround) ⋆/ + /⋆ 7- 6 Quantization / DRC (mpeg audio: 1=DRC exists)(lpcm: 0=16bit, ⋆/ + /⋆ 5- 4 Sample frequency fs (0=48kHz, 1=96kHz) ⋆/ + /⋆ 2- 0 number of audio channels (n+1 channels) ⋆/ +</programlisting> + </section></section> +<section id="audio_function_calls"> +<title>Audio Function Calls</title> + + +<section id="audio_fopen"> +<title>open()</title> +<para>DESCRIPTION +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>This system call opens a named audio device (e.g. /dev/dvb/adapter0/audio0) + for subsequent use. When an open() call has succeeded, the device will be ready + for use. The significance of blocking or non-blocking mode is described in the + documentation for functions where there is a difference. It does not affect the + semantics of the open() call itself. A device opened in blocking mode can later + be put into non-blocking mode (and vice versa) using the F_SETFL command + of the fcntl system call. This is a standard system call, documented in the Linux + manual page for fcntl. Only one user can open the Audio Device in O_RDWR + mode. All other attempts to open the device in this mode will fail, and an error + code will be returned. If the Audio Device is opened in O_RDONLY mode, the + only ioctl call that can be used is AUDIO_GET_STATUS. All other call will + return with an error code.</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>SYNOPSIS +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>int open(const char ⋆deviceName, int flags);</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>PARAMETERS +</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>const char + *deviceName</para> +</entry><entry + align="char"> +<para>Name of specific audio device.</para> +</entry> + </row><row><entry + align="char"> +<para>int flags</para> +</entry><entry + align="char"> +<para>A bit-wise OR of the following flags:</para> +</entry> + </row><row><entry + align="char"> +</entry><entry + align="char"> +<para>O_RDONLY read-only access</para> +</entry> + </row><row><entry + align="char"> +</entry><entry + align="char"> +<para>O_RDWR read/write access</para> +</entry> + </row><row><entry + align="char"> +</entry><entry + align="char"> +<para>O_NONBLOCK open in non-blocking mode</para> +</entry> + </row><row><entry + align="char"> +</entry><entry + align="char"> +<para>(blocking mode is the default)</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>RETURN VALUE</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>ENODEV</para> +</entry><entry + align="char"> +<para>Device driver not loaded/available.</para> +</entry> + </row><row><entry + align="char"> +<para>EBUSY</para> +</entry><entry + align="char"> +<para>Device or resource busy.</para> +</entry> + </row><row><entry + align="char"> +<para>EINVAL</para> +</entry><entry + align="char"> +<para>Invalid argument.</para> +</entry> + </row></tbody></tgroup></informaltable> + +</section> +<section id="audio_fclose"> +<title>close()</title> +<para>DESCRIPTION +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>This system call closes a previously opened audio device.</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>SYNOPSIS +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>int close(int fd);</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>PARAMETERS +</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>int fd</para> +</entry><entry + align="char"> +<para>File descriptor returned by a previous call to open().</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>RETURN VALUE</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>EBADF</para> +</entry><entry + align="char"> +<para>fd is not a valid open file descriptor.</para> +</entry> + </row></tbody></tgroup></informaltable> + +</section> +<section id="audio_fwrite"> +<title>write()</title> +<para>DESCRIPTION +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>This system call can only be used if AUDIO_SOURCE_MEMORY is selected + in the ioctl call AUDIO_SELECT_SOURCE. The data provided shall be in + PES format. If O_NONBLOCK is not specified the function will block until + buffer space is available. The amount of data to be transferred is implied by + count.</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>SYNOPSIS +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>size_t write(int fd, const void ⋆buf, size_t count);</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>PARAMETERS +</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>int fd</para> +</entry><entry + align="char"> +<para>File descriptor returned by a previous call to open().</para> +</entry> + </row><row><entry + align="char"> +<para>void *buf</para> +</entry><entry + align="char"> +<para>Pointer to the buffer containing the PES data.</para> +</entry> + </row><row><entry + align="char"> +<para>size_t count</para> +</entry><entry + align="char"> +<para>Size of buf.</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>RETURN VALUE</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>EPERM</para> +</entry><entry + align="char"> +<para>Mode AUDIO_SOURCE_MEMORY not selected.</para> +</entry> + </row><row><entry + align="char"> +<para>ENOMEM</para> +</entry><entry + align="char"> +<para>Attempted to write more data than the internal buffer can + hold.</para> +</entry> + </row><row><entry + align="char"> +<para>EBADF</para> +</entry><entry + align="char"> +<para>fd is not a valid open file descriptor.</para> +</entry> + </row></tbody></tgroup></informaltable> + +</section><section id="AUDIO_STOP" +role="subsection"><title>AUDIO_STOP</title> +<para>DESCRIPTION +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>This ioctl call asks the Audio Device to stop playing the current stream.</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>SYNOPSIS +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>int ioctl(int fd, int request = AUDIO_STOP);</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>PARAMETERS +</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>int fd</para> +</entry><entry + align="char"> +<para>File descriptor returned by a previous call to open().</para> +</entry> + </row><row><entry + align="char"> +<para>int request</para> +</entry><entry + align="char"> +<para>Equals AUDIO_STOP for this command.</para> +</entry> + </row></tbody></tgroup></informaltable> +&return-value-dvb; + +</section><section id="AUDIO_PLAY" +role="subsection"><title>AUDIO_PLAY</title> +<para>DESCRIPTION +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>This ioctl call asks the Audio Device to start playing an audio stream from the + selected source.</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>SYNOPSIS +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>int ioctl(int fd, int request = AUDIO_PLAY);</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>PARAMETERS +</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>int fd</para> +</entry><entry + align="char"> +<para>File descriptor returned by a previous call to open().</para> +</entry> + </row><row><entry + align="char"> +<para>int request</para> +</entry><entry + align="char"> +<para>Equals AUDIO_PLAY for this command.</para> +</entry> + </row></tbody></tgroup></informaltable> +&return-value-dvb; + +</section><section id="AUDIO_PAUSE" +role="subsection"><title>AUDIO_PAUSE</title> +<para>DESCRIPTION +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>This ioctl call suspends the audio stream being played. Decoding and playing + are paused. It is then possible to restart again decoding and playing process of + the audio stream using AUDIO_CONTINUE command.</para> +</entry> + </row><row><entry + align="char"> +<para>If AUDIO_SOURCE_MEMORY is selected in the ioctl call + AUDIO_SELECT_SOURCE, the DVB-subsystem will not decode (consume) + any more data until the ioctl call AUDIO_CONTINUE or AUDIO_PLAY is + performed.</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>SYNOPSIS +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>int ioctl(int fd, int request = AUDIO_PAUSE);</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>PARAMETERS +</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>int fd</para> +</entry><entry + align="char"> +<para>File descriptor returned by a previous call to open().</para> +</entry> + </row><row><entry + align="char"> +<para>int request</para> +</entry><entry + align="char"> +<para>Equals AUDIO_PAUSE for this command.</para> +</entry> + </row></tbody></tgroup></informaltable> +&return-value-dvb; + +</section><section id="AUDIO_CONTINUE" +role="subsection"><title>AUDIO_CONTINUE</title> +<para>DESCRIPTION +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>This ioctl restarts the decoding and playing process previously paused +with AUDIO_PAUSE command.</para> +</entry> + </row><row><entry + align="char"> +<para>It only works if the stream were previously stopped with AUDIO_PAUSE</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>SYNOPSIS +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>int ioctl(int fd, int request = AUDIO_CONTINUE);</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>PARAMETERS +</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>int fd</para> +</entry><entry + align="char"> +<para>File descriptor returned by a previous call to open().</para> +</entry> + </row><row><entry + align="char"> +<para>int request</para> +</entry><entry + align="char"> +<para>Equals AUDIO_CONTINUE for this command.</para> +</entry> + </row></tbody></tgroup></informaltable> +&return-value-dvb; + +</section><section id="AUDIO_SELECT_SOURCE" +role="subsection"><title>AUDIO_SELECT_SOURCE</title> +<para>DESCRIPTION +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>This ioctl call informs the audio device which source shall be used + for the input data. The possible sources are demux or memory. If + AUDIO_SOURCE_MEMORY is selected, the data is fed to the Audio Device + through the write command.</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>SYNOPSIS +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>int ioctl(int fd, int request = AUDIO_SELECT_SOURCE, + audio_stream_source_t source);</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>PARAMETERS +</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>int fd</para> +</entry><entry + align="char"> +<para>File descriptor returned by a previous call to open().</para> +</entry> + </row><row><entry + align="char"> +<para>int request</para> +</entry><entry + align="char"> +<para>Equals AUDIO_SELECT_SOURCE for this command.</para> +</entry> + </row><row><entry + align="char"> +<para>audio_stream_source_t + source</para> +</entry><entry + align="char"> +<para>Indicates the source that shall be used for the Audio + stream.</para> +</entry> + </row></tbody></tgroup></informaltable> +&return-value-dvb; + +</section><section id="AUDIO_SET_MUTE" +role="subsection"><title>AUDIO_SET_MUTE</title> +<para>DESCRIPTION +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>This ioctl call asks the audio device to mute the stream that is currently being + played.</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>SYNOPSIS +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>int ioctl(int fd, int request = AUDIO_SET_MUTE, + boolean state);</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>PARAMETERS +</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>int fd</para> +</entry><entry + align="char"> +<para>File descriptor returned by a previous call to open().</para> +</entry> + </row><row><entry + align="char"> +<para>int request</para> +</entry><entry + align="char"> +<para>Equals AUDIO_SET_MUTE for this command.</para> +</entry> + </row><row><entry + align="char"> +<para>boolean state</para> +</entry><entry + align="char"> +<para>Indicates if audio device shall mute or not.</para> +</entry> + </row><row><entry + align="char"> +</entry><entry + align="char"> +<para>TRUE Audio Mute</para> +</entry> + </row><row><entry + align="char"> +</entry><entry + align="char"> +<para>FALSE Audio Un-mute</para> +</entry> + </row></tbody></tgroup></informaltable> +&return-value-dvb; + +</section><section id="AUDIO_SET_AV_SYNC" +role="subsection"><title>AUDIO_SET_AV_SYNC</title> +<para>DESCRIPTION +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>This ioctl call asks the Audio Device to turn ON or OFF A/V synchronization.</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>SYNOPSIS +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>int ioctl(int fd, int request = AUDIO_SET_AV_SYNC, + boolean state);</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>PARAMETERS +</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>int fd</para> +</entry><entry + align="char"> +<para>File descriptor returned by a previous call to open().</para> +</entry> + </row><row><entry + align="char"> +<para>int request</para> +</entry><entry + align="char"> +<para>Equals AUDIO_AV_SYNC for this command.</para> +</entry> + </row><row><entry + align="char"> +<para>boolean state</para> +</entry><entry + align="char"> +<para>Tells the DVB subsystem if A/V synchronization shall be + ON or OFF.</para> +</entry> + </row><row><entry + align="char"> +</entry><entry + align="char"> +<para>TRUE AV-sync ON</para> +</entry> + </row><row><entry + align="char"> +</entry><entry + align="char"> +<para>FALSE AV-sync OFF</para> +</entry> + </row></tbody></tgroup></informaltable> +&return-value-dvb; + +</section><section id="AUDIO_SET_BYPASS_MODE" +role="subsection"><title>AUDIO_SET_BYPASS_MODE</title> +<para>DESCRIPTION +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>This ioctl call asks the Audio Device to bypass the Audio decoder and forward + the stream without decoding. This mode shall be used if streams that can’t be + handled by the DVB system shall be decoded. Dolby DigitalTM streams are + automatically forwarded by the DVB subsystem if the hardware can handle it.</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>SYNOPSIS +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>int ioctl(int fd, int request = + AUDIO_SET_BYPASS_MODE, boolean mode);</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>PARAMETERS +</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>int fd</para> +</entry><entry + align="char"> +<para>File descriptor returned by a previous call to open().</para> +</entry> + </row><row><entry + align="char"> +<para>int request</para> +</entry><entry + align="char"> +<para>Equals AUDIO_SET_BYPASS_MODE for this + command.</para> +</entry> + </row><row><entry + align="char"> +<para>boolean mode</para> +</entry><entry + align="char"> +<para>Enables or disables the decoding of the current Audio + stream in the DVB subsystem.</para> +</entry> + </row><row><entry + align="char"> +</entry><entry + align="char"> +<para>TRUE Bypass is disabled</para> +</entry> + </row><row><entry + align="char"> +</entry><entry + align="char"> +<para>FALSE Bypass is enabled</para> +</entry> + </row></tbody></tgroup></informaltable> +&return-value-dvb; + +</section><section id="AUDIO_CHANNEL_SELECT" +role="subsection"><title>AUDIO_CHANNEL_SELECT</title> +<para>DESCRIPTION +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>This ioctl call asks the Audio Device to select the requested channel if possible.</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>SYNOPSIS +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>int ioctl(int fd, int request = + AUDIO_CHANNEL_SELECT, audio_channel_select_t);</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>PARAMETERS +</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>int fd</para> +</entry><entry + align="char"> +<para>File descriptor returned by a previous call to open().</para> +</entry> + </row><row><entry + align="char"> +<para>int request</para> +</entry><entry + align="char"> +<para>Equals AUDIO_CHANNEL_SELECT for this + command.</para> +</entry> + </row><row><entry + align="char"> +<para>audio_channel_select_t + ch</para> +</entry><entry + align="char"> +<para>Select the output format of the audio (mono left/right, + stereo).</para> +</entry> + </row></tbody></tgroup></informaltable> +&return-value-dvb; + +</section><section id="AUDIO_GET_STATUS" +role="subsection"><title>AUDIO_GET_STATUS</title> +<para>DESCRIPTION +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>This ioctl call asks the Audio Device to return the current state of the Audio + Device.</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>SYNOPSIS +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>int ioctl(int fd, int request = AUDIO_GET_STATUS, + struct audio_status ⋆status);</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>PARAMETERS +</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>int fd</para> +</entry><entry + align="char"> +<para>File descriptor returned by a previous call to open().</para> +</entry> + </row><row><entry + align="char"> +<para>int request</para> +</entry><entry + align="char"> +<para>Equals AUDIO_GET_STATUS for this command.</para> +</entry> + </row><row><entry + align="char"> +<para>struct audio_status + *status</para> +</entry><entry + align="char"> +<para>Returns the current state of Audio Device.</para> +</entry> + </row></tbody></tgroup></informaltable> +&return-value-dvb; + +</section><section id="AUDIO_GET_CAPABILITIES" +role="subsection"><title>AUDIO_GET_CAPABILITIES</title> +<para>DESCRIPTION +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>This ioctl call asks the Audio Device to tell us about the decoding capabilities + of the audio hardware.</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>SYNOPSIS +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>int ioctl(int fd, int request = + AUDIO_GET_CAPABILITIES, unsigned int ⋆cap);</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>PARAMETERS +</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>int fd</para> +</entry><entry + align="char"> +<para>File descriptor returned by a previous call to open().</para> +</entry> + </row><row><entry + align="char"> +<para>int request</para> +</entry><entry + align="char"> +<para>Equals AUDIO_GET_CAPABILITIES for this + command.</para> +</entry> + </row><row><entry + align="char"> +<para>unsigned int *cap</para> +</entry><entry + align="char"> +<para>Returns a bit array of supported sound formats.</para> +</entry> + </row></tbody></tgroup></informaltable> +&return-value-dvb; + +</section><section id="AUDIO_CLEAR_BUFFER" +role="subsection"><title>AUDIO_CLEAR_BUFFER</title> +<para>DESCRIPTION +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>This ioctl call asks the Audio Device to clear all software and hardware buffers + of the audio decoder device.</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>SYNOPSIS +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>int ioctl(int fd, int request = AUDIO_CLEAR_BUFFER);</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>PARAMETERS +</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>int fd</para> +</entry><entry + align="char"> +<para>File descriptor returned by a previous call to open().</para> +</entry> + </row><row><entry + align="char"> +<para>int request</para> +</entry><entry + align="char"> +<para>Equals AUDIO_CLEAR_BUFFER for this command.</para> +</entry> + </row></tbody></tgroup></informaltable> +&return-value-dvb; + +</section><section id="AUDIO_SET_ID" +role="subsection"><title>AUDIO_SET_ID</title> +<para>DESCRIPTION +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>This ioctl selects which sub-stream is to be decoded if a program or system + stream is sent to the video device. If no audio stream type is set the id has to be + in [0xC0,0xDF] for MPEG sound, in [0x80,0x87] for AC3 and in [0xA0,0xA7] + for LPCM. More specifications may follow for other stream types. If the stream + type is set the id just specifies the substream id of the audio stream and only + the first 5 bits are recognized.</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>SYNOPSIS +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>int ioctl(int fd, int request = AUDIO_SET_ID, int + id);</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>PARAMETERS +</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>int fd</para> +</entry><entry + align="char"> +<para>File descriptor returned by a previous call to open().</para> +</entry> + </row><row><entry + align="char"> +<para>int request</para> +</entry><entry + align="char"> +<para>Equals AUDIO_SET_ID for this command.</para> +</entry> + </row><row><entry + align="char"> +<para>int id</para> +</entry><entry + align="char"> +<para>audio sub-stream id</para> +</entry> + </row></tbody></tgroup></informaltable> +&return-value-dvb; + +</section><section id="AUDIO_SET_MIXER" +role="subsection"><title>AUDIO_SET_MIXER</title> +<para>DESCRIPTION +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>This ioctl lets you adjust the mixer settings of the audio decoder.</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>SYNOPSIS +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>int ioctl(int fd, int request = AUDIO_SET_MIXER, + audio_mixer_t ⋆mix);</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>PARAMETERS +</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>int fd</para> +</entry><entry + align="char"> +<para>File descriptor returned by a previous call to open().</para> +</entry> + </row><row><entry + align="char"> +<para>int request</para> +</entry><entry + align="char"> +<para>Equals AUDIO_SET_ID for this command.</para> +</entry> + </row><row><entry + align="char"> +<para>audio_mixer_t *mix</para> +</entry><entry + align="char"> +<para>mixer settings.</para> +</entry> + </row></tbody></tgroup></informaltable> +&return-value-dvb; + +</section><section id="AUDIO_SET_STREAMTYPE" +role="subsection"><title>AUDIO_SET_STREAMTYPE</title> +<para>DESCRIPTION +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>This ioctl tells the driver which kind of audio stream to expect. This is useful + if the stream offers several audio sub-streams like LPCM and AC3.</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>SYNOPSIS +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>int ioctl(fd, int request = AUDIO_SET_STREAMTYPE, + int type);</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>PARAMETERS +</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>int fd</para> +</entry><entry + align="char"> +<para>File descriptor returned by a previous call to open().</para> +</entry> + </row><row><entry + align="char"> +<para>int request</para> +</entry><entry + align="char"> +<para>Equals AUDIO_SET_STREAMTYPE for this + command.</para> +</entry> + </row><row><entry + align="char"> +<para>int type</para> +</entry><entry + align="char"> +<para>stream type</para> +</entry> + </row></tbody></tgroup></informaltable> +&return-value-dvb; +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>EINVAL</para> +</entry><entry + align="char"> +<para>type is not a valid or supported stream type.</para> +</entry> + </row></tbody></tgroup></informaltable> + +</section><section id="AUDIO_SET_EXT_ID" +role="subsection"><title>AUDIO_SET_EXT_ID</title> +<para>DESCRIPTION +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>This ioctl can be used to set the extension id for MPEG streams in DVD + playback. Only the first 3 bits are recognized.</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>SYNOPSIS +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>int ioctl(fd, int request = AUDIO_SET_EXT_ID, int + id);</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>PARAMETERS +</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>int fd</para> +</entry><entry + align="char"> +<para>File descriptor returned by a previous call to open().</para> +</entry> + </row><row><entry + align="char"> +<para>int request</para> +</entry><entry + align="char"> +<para>Equals AUDIO_SET_EXT_ID for this command.</para> +</entry> + </row><row><entry + align="char"> +<para>int id</para> +</entry><entry + align="char"> +<para>audio sub_stream_id</para> +</entry> + </row></tbody></tgroup></informaltable> +&return-value-dvb; +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>EINVAL</para> +</entry><entry + align="char"> +<para>id is not a valid id.</para> +</entry> + </row></tbody></tgroup></informaltable> + +</section><section id="AUDIO_SET_ATTRIBUTES" +role="subsection"><title>AUDIO_SET_ATTRIBUTES</title> +<para>DESCRIPTION +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>This ioctl is intended for DVD playback and allows you to set certain + information about the audio stream.</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>SYNOPSIS +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>int ioctl(fd, int request = AUDIO_SET_ATTRIBUTES, + audio_attributes_t attr );</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>PARAMETERS +</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>int fd</para> +</entry><entry + align="char"> +<para>File descriptor returned by a previous call to open().</para> +</entry> + </row><row><entry + align="char"> +<para>int request</para> +</entry><entry + align="char"> +<para>Equals AUDIO_SET_ATTRIBUTES for this command.</para> +</entry> + </row><row><entry + align="char"> +<para>audio_attributes_t + attr</para> +</entry><entry + align="char"> +<para>audio attributes according to section ??</para> +</entry> + </row></tbody></tgroup></informaltable> +&return-value-dvb; +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>EINVAL</para> +</entry><entry + align="char"> +<para>attr is not a valid or supported attribute setting.</para> +</entry> + </row></tbody></tgroup></informaltable> + +</section><section id="AUDIO_SET_KARAOKE" +role="subsection"><title>AUDIO_SET_KARAOKE</title> +<para>DESCRIPTION +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>This ioctl allows one to set the mixer settings for a karaoke DVD.</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>SYNOPSIS +</para> +<informaltable><tgroup cols="1"><tbody><row><entry + align="char"> +<para>int ioctl(fd, int request = AUDIO_SET_KARAOKE, + audio_karaoke_t ⋆karaoke);</para> +</entry> + </row></tbody></tgroup></informaltable> +<para>PARAMETERS +</para> +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>int fd</para> +</entry><entry + align="char"> +<para>File descriptor returned by a previous call to open().</para> +</entry> + </row><row><entry + align="char"> +<para>int request</para> +</entry><entry + align="char"> +<para>Equals AUDIO_SET_KARAOKE for this + command.</para> +</entry> + </row><row><entry + align="char"> +<para>audio_karaoke_t + *karaoke</para> +</entry><entry + align="char"> +<para>karaoke settings according to section ??.</para> +</entry> + </row></tbody></tgroup></informaltable> +&return-value-dvb; +<informaltable><tgroup cols="2"><tbody><row><entry + align="char"> +<para>EINVAL</para> +</entry><entry + align="char"> +<para>karaoke is not a valid or supported karaoke setting.</para> +</entry> + </row></tbody></tgroup></informaltable> + </section> +</section> |