/*      $NetBSD: audio.c,v 1.27 2024/02/27 21:05:34 gson Exp $  */

/*
* Copyright (c) 1999, 2013, 2015, 2019 Matthew R. Green
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
*    notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
*    notice, this list of conditions and the following disclaimer in the
*    documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/

/*
* XXX this is slightly icky in places...
*/
#include <sys/cdefs.h>

#ifndef lint
__RCSID("$NetBSD: audio.c,v 1.27 2024/02/27 21:05:34 gson Exp $");
#endif


#include <sys/types.h>
#include <sys/audioio.h>
#include <sys/ioctl.h>
#include <sys/time.h>
#include <sys/uio.h>

#include <unistd.h>
#include <ctype.h>
#include <err.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include "libaudio.h"
#include "auconv.h"

/* what format am i? */

static const struct {
       const char *fname;
       int fno;
} formats[] = {
       { "sunau",              AUDIO_FORMAT_SUN },
       { "au",                 AUDIO_FORMAT_SUN },
       { "sun",                AUDIO_FORMAT_SUN },
       { "wav",                AUDIO_FORMAT_WAV },
       { "wave",               AUDIO_FORMAT_WAV },
       { "riff",               AUDIO_FORMAT_WAV },
       { "no",                 AUDIO_FORMAT_NONE },
       { "none",               AUDIO_FORMAT_NONE },
       { NULL, -1 }
};

char    audio_default_info[8] = { '\0', '\0', '\0', '\0', '\0', '\0', '\0', '\0' };

int
audio_format_from_str(char *str)
{
       int     i;

       for (i = 0; formats[i].fname; i++)
               if (strcasecmp(formats[i].fname, str) == 0)
                       break;
       return (formats[i].fno);
}



/* back and forth between encodings */
static const struct {
       const char *ename;
       int eno;
} encs[] = {
       { AudioEmulaw,          AUDIO_ENCODING_ULAW },
       { "ulaw",               AUDIO_ENCODING_ULAW },
       { AudioEalaw,           AUDIO_ENCODING_ALAW },
       { AudioEslinear,        AUDIO_ENCODING_SLINEAR },
       { "linear",             AUDIO_ENCODING_SLINEAR },
       { AudioEulinear,        AUDIO_ENCODING_ULINEAR },
       { AudioEadpcm,          AUDIO_ENCODING_ADPCM },
       { "ADPCM",              AUDIO_ENCODING_ADPCM },
       { AudioEslinear_le,     AUDIO_ENCODING_SLINEAR_LE },
       { "linear_le",          AUDIO_ENCODING_SLINEAR_LE },
       { AudioEulinear_le,     AUDIO_ENCODING_ULINEAR_LE },
       { AudioEslinear_be,     AUDIO_ENCODING_SLINEAR_BE },
       { "linear_be",          AUDIO_ENCODING_SLINEAR_BE },
       { AudioEulinear_be,     AUDIO_ENCODING_ULINEAR_BE },
       { AudioEmpeg_l1_stream, AUDIO_ENCODING_MPEG_L1_STREAM },
       { AudioEmpeg_l1_packets,AUDIO_ENCODING_MPEG_L1_PACKETS },
       { AudioEmpeg_l1_system, AUDIO_ENCODING_MPEG_L1_SYSTEM },
       { AudioEmpeg_l2_stream, AUDIO_ENCODING_MPEG_L2_STREAM },
       { AudioEmpeg_l2_packets,AUDIO_ENCODING_MPEG_L2_PACKETS },
       { AudioEmpeg_l2_system, AUDIO_ENCODING_MPEG_L2_SYSTEM },
       { AudioEac3,            AUDIO_ENCODING_AC3 },
       { "ieee_float32",       AUDIO_ENCODING_LIBAUDIO_FLOAT32 },
       { "ieee_float64",       AUDIO_ENCODING_LIBAUDIO_FLOAT64 },
       { NULL, -1 }
};


const char *
audio_enc_from_val(int val)
{
       int     i;

       for (i = 0; encs[i].ename; i++)
               if (encs[i].eno == val)
                       break;
       return (encs[i].ename);
}

int
audio_enc_to_val(const char *enc)
{
       int     i;

       for (i = 0; encs[i].ename; i++)
               if (strcmp(encs[i].ename, enc) == 0)
                       break;
       if (encs[i].ename)
               return (encs[i].eno);
       else
               return (AUDIO_ENOENT);
}

/*
* decode a string into an encoding value.
*/
void
decode_encoding(const char *arg, int *encp)
{
       size_t  len;
       int i;

       len = strlen(arg);
       for (i = 0; encs[i].ename; i++)
               if (strncmp(encs[i].ename, arg, len) == 0) {
                       *encp = encs[i].eno;
                       return;
               }
       errx(1, "unknown encoding `%s'", arg);
}

static const char *const audio_errlist[] = {
       "error zero",                           /* nothing? */
       "no audio entry",                       /* AUDIO_ENOENT */
       "short header",                         /* AUDIO_ESHORTHDR */
       "unsupported WAV format",               /* AUDIO_EWAVUNSUPP */
       "bad (unsupported) WAV PCM format",     /* AUDIO_EWAVBADPCM */
       "no WAV audio data",                    /* AUDIO_EWAVNODATA */
       "internal error",                       /* AUDIO_EINTERNAL */
};

const char *
audio_errstring(int errval)
{

       errval = -errval;
       if (errval < 1 || errval > AUDIO_MAXERRNO)
               return "Invalid error";
       return audio_errlist[errval];
}

void
write_header(struct track_info *ti)
{
       struct iovec iv[3];
       int veclen, left, tlen;
       void *hdr;
       size_t hdrlen;

       switch (ti->format) {
       case AUDIO_FORMAT_DEFAULT:
       case AUDIO_FORMAT_SUN:
               if (sun_prepare_header(ti, &hdr, &hdrlen, &left) != 0)
                       return;
               break;
       case AUDIO_FORMAT_WAV:
               if (wav_prepare_header(ti, &hdr, &hdrlen, &left) != 0)
                       return;
               break;
       case AUDIO_FORMAT_NONE:
               return;
       default:
               errx(1, "unknown audio format");
       }

       veclen = 0;
       tlen = 0;

       if (hdrlen != 0) {
               iv[veclen].iov_base = hdr;
               iv[veclen].iov_len = hdrlen;
               tlen += iv[veclen++].iov_len;
       }
       if (ti->header_info) {
               iv[veclen].iov_base = ti->header_info;
               iv[veclen].iov_len = (int)strlen(ti->header_info) + 1;
               tlen += iv[veclen++].iov_len;
       }
       if (left) {
               iv[veclen].iov_base = audio_default_info;
               iv[veclen].iov_len = left;
               tlen += iv[veclen++].iov_len;
       }

       if (tlen == 0)
               return;

       if (writev(ti->outfd, iv, veclen) != tlen)
               err(1, "could not write audio header");
}

write_conv_func
write_get_conv_func(struct track_info *ti)
{

       switch (ti->format) {
       case AUDIO_FORMAT_DEFAULT:
       case AUDIO_FORMAT_SUN:
               return sun_write_get_conv_func(ti);
       case AUDIO_FORMAT_WAV:
               return wav_write_get_conv_func(ti);
       case AUDIO_FORMAT_NONE:
               return NULL;
       default:
               errx(1, "unknown audio format");
       }
}

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