tts.h

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enum VOICE_ENGINES {
        VE_NO_OVERRIDE  = 0,
        VE_DEFAULT              = 0,
        VE_ESPEAK               = 1,
        VE_FESTIVAL             = 2,
        VE_WIN32                = 3,
        VE_GTRANS               = 4
};

enum VOICE_OUTPUT_FORMATS {
        VOF_MP3,
        VOF_WAV
};

struct TTS_JOB {
        union {
                const char * text; 
                const char * inputFN; 
        };
        const char * outputFN; 

        // these options only apply to MP3 jobs and WAV jobs on Windows (ignored for Linux WAV jobs)
        int32 channels; 
        int32 sample; 

        // these options only apply to MP3 jobs
        int32 bitrate; 
        
        VOICE_ENGINES EngineOverride; 
        char VoiceOverride[128]; 
};

struct TTS_INTERFACE {
        VOICE_OUTPUT_FORMATS (*GetPreferredOutputFormat)(VOICE_ENGINES Engine);
        bool (*MakeMP3FromText)(TTS_JOB * job);
        bool (*MakeWAVFromText)(TTS_JOB * job);
        bool (*MakeMP3FromFile)(TTS_JOB * job);
        bool (*MakeWAVFromFile)(TTS_JOB * job);
};