int frame_output_format ( mpg123_handle * fr )
Definition at line 167 of file format.c.
{
    struct audioformat nf;
    int f0=0;
    int f2=MPG123_ENCODINGS; /* Omit the 32bit and float encodings. */
    mpg123_pars *p = &fr->p;
    /* initialize new format, encoding comes later */
    nf.channels = fr->stereo;

    /* All this forcing should be removed in favour of the capabilities table... */
    if(p->flags & MPG123_FORCE_8BIT)
    {
        f0 = 6;
        f2 = 10;
    }
    if(p->flags & MPG123_FORCE_FLOAT)
    {
        f0 = 4;
        f2 = 6;
    }

    /* force stereo is stronger */
    if(p->flags & MPG123_FORCE_MONO)   nf.channels = 1;
    if(p->flags & MPG123_FORCE_STEREO) nf.channels = 2;

#ifndef NO_NTOM
    if(p->force_rate)
    {
        nf.rate = p->force_rate;
        if(cap_fit(fr,&nf,f0,2)) goto end;            /* 16bit encodings */
        if(cap_fit(fr,&nf,f0<=2 ? 2 : f0,f2)) goto end; /*  8bit encodings */

        /* try again with different stereoness */
        if(nf.channels == 2 && !(p->flags & MPG123_FORCE_STEREO)) nf.channels = 1;
        else if(nf.channels == 1 && !(p->flags & MPG123_FORCE_MONO)) nf.channels = 2;

        if(cap_fit(fr,&nf,f0,2)) goto end;            /* 16bit encodings */
        if(cap_fit(fr,&nf,f0<=2 ? 2 : f0,f2)) goto end; /*  8bit encodings */

        if(NOQUIET)
        error3( "Unable to set up output format! Constraints: %s%s%liHz.",
                ( p->flags & MPG123_FORCE_STEREO ? "stereo, " :
                  (p->flags & MPG123_FORCE_MONO ? "mono, " : "") ),
                (p->flags & MPG123_FORCE_8BIT ? "8bit, " : ""),
                p->force_rate );
/*      if(NOQUIET && p->verbose <= 1) print_capabilities(fr); */

        fr->err = MPG123_BAD_OUTFORMAT;
        return -1;
    }
#endif

    if(freq_fit(fr, &nf, f0, 2)) goto end; /* try rates with 16bit */
    if(freq_fit(fr, &nf, f0<=2 ? 2 : f0, f2)) goto end; /* ... 8bit */

    /* try again with different stereoness */
    if(nf.channels == 2 && !(p->flags & MPG123_FORCE_STEREO)) nf.channels = 1;
    else if(nf.channels == 1 && !(p->flags & MPG123_FORCE_MONO)) nf.channels = 2;

    if(freq_fit(fr, &nf, f0, 2)) goto end; /* try rates with 16bit */
    if(freq_fit(fr, &nf,  f0<=2 ? 2 : f0, f2)) goto end; /* ... 8bit */

    /* Here is the _bad_ end. */
    if(NOQUIET)
    {
        error5( "Unable to set up output format! Constraints: %s%s%li, %li or %liHz.",
                ( p->flags & MPG123_FORCE_STEREO ? "stereo, " :
                  (p->flags & MPG123_FORCE_MONO ? "mono, "  : "") ),
                (p->flags & MPG123_FORCE_8BIT  ? "8bit, " : ""),
                frame_freq(fr),  frame_freq(fr)>>1, frame_freq(fr)>>2 );
    }
/*  if(NOQUIET && p->verbose <= 1) print_capabilities(fr); */

    fr->err = MPG123_BAD_OUTFORMAT;
    return -1;

end: /* Here is the _good_ end. */
    /* we had a successful match, now see if there's a change */
    if(nf.rate == fr->af.rate && nf.channels == fr->af.channels && nf.encoding == fr->af.encoding)
    {
        debug2("Old format with %i channels, and FORCE_MONO=%li", nf.channels, p->flags & MPG123_FORCE_MONO);
        return 0; /* the same format as before */
    }
    else /* a new format */
    {
        debug1("New format with %i channels!", nf.channels);
        fr->af.rate = nf.rate;
        fr->af.channels = nf.channels;
        fr->af.encoding = nf.encoding;
        /* Cache the size of one sample in bytes, for ease of use. */
        if(fr->af.encoding & MPG123_ENC_8)
        fr->af.encsize = 1;
        else if(fr->af.encoding & MPG123_ENC_16)
        fr->af.encsize = 2;
        else if(fr->af.encoding & MPG123_ENC_32 || fr->af.encoding == MPG123_ENC_FLOAT_32)
        fr->af.encsize = 4;
        else if(fr->af.encoding == MPG123_ENC_FLOAT_64)
        fr->af.encsize = 8;
        else
        {
            if(NOQUIET) error1("Some unknown encoding??? (%i)", fr->af.encoding);

            fr->err = MPG123_BAD_OUTFORMAT;
            return -1;
        }
        return 1;
    }
}
ReactOS Development > Doxygen
