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Add rudimentary audio_player based on libav
For further information please look at 'src/app/audio_player/README'. Fixes TUD-OS#41.
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‎run/audio_player.run‎

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#
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# Build
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#
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set build_components {
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core init
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drivers/timer
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drivers/audio
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server/report_rom
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server/dynamic_rom
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app/audio_player
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}
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source ${genode_dir}/repos/base/run/platform_drv.inc
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append_platform_drv_build_components
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build $build_components
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create_boot_directory
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#
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# Config
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#
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append config {
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<config>
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<parent-provides>
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<service name="ROM"/>
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<service name="RAM"/>
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<service name="IRQ"/>
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<service name="IO_MEM"/>
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<service name="IO_PORT"/>
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<service name="CAP"/>
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<service name="PD"/>
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<service name="RM"/>
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<service name="CPU"/>
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<service name="LOG"/>
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<service name="SIGNAL" />
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</parent-provides>
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<default-route>
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<any-service> <parent/> <any-child/> </any-service>
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</default-route>
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<start name="timer">
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<resource name="RAM" quantum="1M"/>
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<provides><service name="Timer"/></provides>
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</start>}
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append_platform_drv_config
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append config {
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<start name="report_rom">
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<resource name="RAM" quantum="4M"/>
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<provides> <service name="Report"/> <service name="ROM"/> </provides>
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<config verbose="yes">
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<rom>
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<policy label="" report="audio_player -> current_track"/>
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</rom>
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</config>
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</start>
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<start name="dynamic_rom">
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<resource name="RAM" quantum="4M"/>
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<provides><service name="ROM"/></provides>
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<config verbose="yes">
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<rom name="playlist">
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<inline description="initial playlist">
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<playlist>
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<track path="foo.mp3"/>
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<track path="foo.ogg"/>
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<track path="foo.flac"/>
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</playlist>
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</inline>
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<sleep milliseconds="30000"/>
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<inline description="initial playlist">
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<playlist>
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<track path="foo.ogg"/>
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</playlist>
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</inline>
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<sleep milliseconds="30000"/>
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</rom>
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<rom name="audio_player.config">
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<inline description="initial config">
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<config ld_verbose="yes" state="playing" playlist_mode="repeat">
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<report progress="yes" interval="1" playlist="yes"/>
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<libc>
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<vfs>
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<rom name="foo.mp3"/>
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<rom name="foo.flac"/>
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<rom name="foo.ogg"/>
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</vfs>
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</libc>
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</config>
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</inline>
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<sleep milliseconds="10000"/>
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<inline description="select third track">
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<config state="playing" playlist_mode="repeat" selected_track="3"/>
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</inline>
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<sleep milliseconds="5000"/>
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<inline description="select first track">
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<config state="playing" playlist_mode="repeat" selected_track="1"/>
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</inline>
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<sleep milliseconds="5000"/>
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<inline description="select second track">
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<config state="playing" playlist_mode="repeat" selected_track="2"/>
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</inline>
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<sleep milliseconds="5000"/>
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</rom>
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</config>
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</start>
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<start name="audio_drv">
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<resource name="RAM" quantum="8M"/>
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<provides> <service name="Audio_out"/> </provides>
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<config/>
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</start>
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<start name="audio_player">
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<resource name="RAM" quantum="16M"/>
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<configfile name="audio_player.config"/>
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<route>
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<service name="ROM" label="audio_player.config"> <child name="dynamic_rom"/> </service>
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<service name="ROM" label="playlist"> <child name="dynamic_rom"/> </service>
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<service name="Report" label="current_track"> <child name="report_rom"/> </service>
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<any-service> <parent/> <any-child/> </any-service>
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</route>
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</start>
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</config>}
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install_config $config
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#
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# Check audio files
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#
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if {[expr ![file exists bin/foo.flac] || ![file exists bin/foo.mp3] || ![file exists bin/foo.ogg]]} {
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puts ""
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puts "One or all audio files are missing. Please put 'foo.flac', 'foo.mp3' and"
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puts "'foo.ogg' into './bin' and execute this run script again. Note, that the"
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puts "duration of each of those files has to be below 10 seconds for this run"
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puts "script to work properly."
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puts ""
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exit 1
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}
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#
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# Boot modules
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#
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set boot_modules {
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core init timer dynamic_rom report_rom audio_drv
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ld.lib.so libc.lib.so libm.lib.so zlib.lib.so
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avcodec.lib.so avformat.lib.so avutil.lib.so
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avresample.lib.so pthread.lib.so
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audio_player
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foo.mp3 foo.flac foo.ogg
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}
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append_platform_drv_boot_modules
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build_boot_image $boot_modules
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run_genode_until forever

‎src/app/audio_player/README‎

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This directory contains a rudimentary audio player. It plays all tracks from
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a given playlist and reports the currently playing track.
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Configuration
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~~~~~~~~~~~~~
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A typical example configuration looks as follows:
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! <config>
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! <report progress="yes" interval="3" playlist="yes"/>
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! <libc>
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! <vfs>
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! <rom name="foo.flac"/>
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! <rom name="foo.mp3"/>
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! <rom name="foo.ogg"/>
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! </vfs>
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! </libc>
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! </config>
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The audio player obtains its audio files from the libc VFS. In this example,
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the VFS is configured to present three ROM modules as files in the root
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directory. In addition the audio player requests another ROM module that
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contains the actual playlist:
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! <playlist mode="repeat">
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! <track path="foo.ogg"/>
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! <track path="foo.flac"/>
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! </playlist>
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The prior mentioned files are then referred to by the subsequent '<track>'
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nodes within the '<playlist>' node. How the player processes the playlist is
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specified via the 'mode' attribute. Valid values are 'once' and 'repeat'
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whereat 'once' is the default mode. Everytime the playlist is altered, the
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audio player updates its internal representation of the playlist but keeps
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playing the current track till its end.
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Playback can be paused, stopped and of course started again by setting the
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'state' attribute of the '<config>' node to 'playing', 'paused' or 'stopped'.
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The player is automatically stopped if the 'state' attribute is missing.
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When playback is started the player starts playing at the first track of the
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playlist. Furthermore the player can be instructed to start at a different
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track by specifying the number of the track in the 'selected_track' attribute.
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This attribute may also be used to select a different track while the player
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is playing.
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The initial configuration must include the VFS configuration, all following
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configurations may safely ommit it.
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Status reporting
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~~~~~~~~~~~~~~~~
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Every time the player changes the track it generates a report that contains
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information about the track that is now being played. A typical report looks
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like this:
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! <current_track id="1" path="foo.ogg" artist="Foobar" album="SNAFU" title="blubb" duration="60000"/>
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The duration is given in milliseconds.
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When the 'report' node is present in the configuration additional reports
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are generated. If the 'progress' attribute is set to 'yes' the player will
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report the current progress in the 'current_track' report. The frequencey
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of reporting is specified by setting the 'interval' attribute. The interval
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is given in seconds. if the 'playlist' attribute is set to 'yes' the
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player will generate a report containing the playlist but each '<track>' node
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is enriched by the meta information of each track like in the 'current_track'
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report.
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Example
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~~~~~~~
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Please refer to the _gems/run/audio_player.run_ script for a practical example of
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using the audio player.
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There is also a selection of bash scripts in _gems/src/app/audio_player/noux_
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which can be used from Noux to control the audio player.

‎src/app/audio_player/list.h‎

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/*
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* \brief Slightly improved list
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* \author Christian Helmuth
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* \date 2014-09-25
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*/
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/*
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* Copyright (C) 2014 Genode Labs GmbH
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*
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* This file is part of the Genode OS framework, which is distributed
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* under the terms of the GNU General Public License version 2.
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*/
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#ifndef _LIST_H_
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#define _LIST_H_
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#include <util/list.h>
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namespace Util {
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template <typename> class List;
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template <typename> class List_element;
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}
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template <typename LT>
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class Util::List : private Genode::List<LT>
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{
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private:
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typedef Genode::List<LT> Base;
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public:
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using Base::Element;
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void append(LT const *le)
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{
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LT *at = nullptr;
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for (LT *l = first(); l; l = l->next())
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at = l;
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Base::insert(le, at);
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}
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void prepend(LT const *le)
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{
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Base::insert(le);
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}
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void insert_before(LT const *le, LT const *at)
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{
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if (at == first()) {
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prepend(le);
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return;
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} else if (!at) {
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append(le);
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return;
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}
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for (LT *l = first(); l; l = l->next())
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if (l->next() == at)
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at = l;
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Base::insert(le, at);
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}
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/****************************
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** Genode::List interface **
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****************************/
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LT *first() { return Base::first(); }
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LT const *first() const { return Base::first(); }
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void insert(LT const *le, LT const *at = 0)
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{
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Base::insert(le, at);
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}
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void remove(LT const *le)
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{
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Base::remove(le);
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}
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};
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template <typename T>
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class Util::List_element : public Util::List<List_element<T> >::Element
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{
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private:
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T *_object;
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public:
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List_element(T *object) : _object(object) { }
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T *object() const { return _object; }
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};
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#endif /* _LIST_H_ */

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