Updated sdltts.c with background playback

sdltts.c

/*************************************************************************/
/*                                                                       */
/*                  Language Technologies Institute                      */
/*                     Carnegie Mellon University                        */
/*                         Copyright (c) 2001                            */
/*                        All Rights Reserved.                           */
/*                                                                       */
/*                           Fahrzin Hemmati                             */
/*                         Copyright (c) 2011                            */
/*                                                                       */
/*  Permission is hereby granted, free of charge, to use and distribute  */
/*  this software and its documentation without restriction, including   */
/*  without limitation the rights to use, copy, modify, merge, publish,  */
/*  distribute, sublicense, and/or sell copies of this work, and to      */
/*  permit persons to whom this work is furnished to do so, subject to   */
/*  the following conditions:                                            */
/*   1. The code must retain the above copyright notice, this list of    */
/*      conditions and the following disclaimer.                         */
/*   2. Any modifications must be clearly marked as such.                */
/*   3. Original authors' names are not deleted.                         */
/*   4. The authors' names are not used to endorse or promote products   */
/*      derived from this software without specific prior written        */
/*      permission.                                                      */
/*   5. Modifications must be sent back to the author at their provided  */
/*      email address.                                                   */
/*                                                                       */
/*  CARNEGIE MELLON UNIVERSITY AND THE CONTRIBUTORS TO THIS WORK         */
/*  DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING      */
/*  ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT   */
/*  SHALL CARNEGIE MELLON UNIVERSITY NOR THE CONTRIBUTORS BE LIABLE      */
/*  FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES    */
/*  WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN   */
/*  AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,          */
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/*  THIS SOFTWARE.                                                       */
/*                                                                       */
/*************************************************************************/
/*             Author:  Fahrzin Hemmati (fahhem@fahhem.com)              */
/*               Date:  October 2011                                     */
/*************************************************************************/
/*                                                                       */
/*  Flite as a Hybrid PDK plugin                                         */
/*                                                                       */
/*************************************************************************/

#include "flite.h"
#include "flite_version.h"

#include "SDL.h"
#include "SDL_mixer.h"
#include "PDL.h"

#include

extern cst_val *flite_set_voice_list(void);

void playText(const char * text) {
    cst_wave * w;
    w = flite_text_to_wave(text, flite_voice_select(NULL));

    if(Mix_OpenAudio(w->sample_rate, AUDIO_S16SYS, w->num_channels, 4096))
        exit(1);

    Mix_Chunk * sound = Mix_QuickLoad_RAW((Uint8*)w->samples,w->num_samples*sizeof(short));
    if(sound == NULL)
        exit(2);

    int channel = Mix_PlayChannel(-1, sound, 0);
    if(channel == -1)
        exit(3);
    while(Mix_Playing(channel) != 0);

    Mix_FreeChunk(sound);
    Mix_CloseAudio();
}

PDL_bool playAudio(PDL_JSParameters * parms) {
    const char * text = PDL_GetJSParamString(parms,0);

    /* since we don't process this in the method thread, instead post a
    * SDL event that will be received in the main thread and used to 
    * launch the code. */
    SDL_Event event;
    event.user.type = SDL_USEREVENT;
    event.user.code = 0;
    event.user.data1 = strdup(text);
    SDL_PushEvent(&event);

    PDL_JSReply(parms, "{}");

    return 0;
}



void TTS_Init() {
    flite_init();
    flite_voice_list = flite_set_voice_list();
}

int main(int argc, char ** argv) {
    if(argc==2)
    {
        // don't do SDL loop
        flite_init();
        flite_voice_list = flite_set_voice_list();
        playText(argv[1]);
        exit(0);
        return 0;
    }

    // Initializes the video subsystem
    if (SDL_Init(SDL_INIT_AUDIO | SDL_INIT_VIDEO) < 0) {
        exit(1);
    }
    PDL_Init(0);
    TTS_Init();
    atexit(SDL_Quit);
    atexit(PDL_Quit);

    PDL_RegisterJSHandler("playAudio",playAudio);
    PDL_JSRegistrationComplete();
    PDL_CallJS("ready", NULL, 0);

    SDL_Event Event;

    while (1) {
        SDL_WaitEvent(&Event);
        if(Event.type == SDL_USER && Event.code == 0) {
            playText((const char *)event.user.data1);
            PDL_CallJS("playbackComplete", NULL, 0);
            free(event.user.data1);
        }
        if(Event.type == SDL_QUIT) exit(0);
    }
}