63 lines
2.6 KiB
C
63 lines
2.6 KiB
C
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#pragma once
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#include "foundation/dispatch.h"
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/* ok, this could have easily been a config group, but I decided to make it its own interface for two reasons
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1) it's a little more maintainable and easier to understand and use, rather than just using a generic key/value interface
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2) the original ReplayGain specs suggests using the average gain of the last 10 played tracks in cases of missing replay gain data
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http://replaygain.hydrogenaudio.org/proposal/player_scale.html
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So we need a way to have the playback object pass along gain values so they can be averages in this way
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*/
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// {1CE24DEC-A189-4BC7-86A7-C6CDB0F8953D}
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static const GUID replaygain_settings_interface_guid =
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{ 0x1ce24dec, 0xa189, 0x4bc7, { 0x86, 0xa7, 0xc6, 0xcd, 0xb0, 0xf8, 0x95, 0x3d } };
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class ifc_metadata;
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class ifc_replaygain_settings : public Wasabi2::Dispatchable
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{
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protected:
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ifc_replaygain_settings() : Wasabi2::Dispatchable(DISPATCHABLE_VERSION) {}
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~ifc_replaygain_settings() {}
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public:
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static GUID GetInterfaceGUID() { return replaygain_settings_interface_guid; }
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enum
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{
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REPLAYGAIN_OFF=0x0,
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REPLAYGAIN_ON=0x1,
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REPLAYGAIN_MODE_TRACK=0x2,
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REPLAYGAIN_MODE_ALBUM=0x4,
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REPLAYGAIN_MODE_MASK=REPLAYGAIN_MODE_TRACK|REPLAYGAIN_MODE_ALBUM,
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REPLAYGAIN_PREVENT_CLIPPING=0x8,
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REPLAYGAIN_AUTO=0x16, // automatically determine gain values for unscanned tracks from prior history
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};
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/* pass the ifc_metadata associated with the track
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warning values:
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NErr_Success: gain is set to the gain adjustment to play this track with
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NErr_False: gain is set to the default gain adjustment because there was no metadata
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NErr_Unknown: gain is set to the default gain adjustment, because the metadata object does not understand the ReplayGain metadata keys (MetadataKeys::TRACK_GAIN, etc)
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return values:
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NErr_Success: *gain has been assigned and is valid
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NErr_Disabled: ReplayGain is turned off
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*/
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int GetGain(ifc_metadata *metadata, double *gain, int *warning) { return ReplayGainSettings_GetGain(metadata, gain, warning); }
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/* Adds a track to the history, which is optionally used when playing back tracks without ReplayGain
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pass the track length (or an estimate). Pass 0.0 for length if don't know.
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You should only call this if GetGain returned NErr_Success and there was no warning!
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*/
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int AddToHistory(double seconds, double gain) { return ReplayGainSettings_AddToHistory(seconds, gain); }
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private:
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virtual int WASABICALL ReplayGainSettings_GetGain(ifc_metadata *metadata, double *gain, int *warning)=0;
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virtual int WASABICALL ReplayGainSettings_AddToHistory(double seconds, double gain)=0;
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enum
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{
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DISPATCHABLE_VERSION,
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};
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};
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