377 lines
9.1 KiB
C
377 lines
9.1 KiB
C
/* $NetBSD: audio.c,v 1.9 1999/09/27 05:06:10 mrg Exp $ */
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/*
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* Copyright (c) 1999 Matthew R. Green
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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/*
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* XXX this is slightly icky in places...
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*/
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#include <sys/types.h>
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#include <sys/audioio.h>
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#include <sys/ioctl.h>
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#include <sys/time.h>
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#include <ctype.h>
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#include <err.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "libaudio.h"
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/* back and forth between encodings */
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struct {
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char *ename;
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int eno;
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} encs[] = {
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{ AudioEmulaw, AUDIO_ENCODING_ULAW },
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{ "ulaw", AUDIO_ENCODING_ULAW },
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{ AudioEalaw, AUDIO_ENCODING_ALAW },
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{ AudioEslinear, AUDIO_ENCODING_SLINEAR },
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{ "linear", AUDIO_ENCODING_SLINEAR },
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{ AudioEulinear, AUDIO_ENCODING_ULINEAR },
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{ AudioEadpcm, AUDIO_ENCODING_ADPCM },
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{ "ADPCM", AUDIO_ENCODING_ADPCM },
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{ AudioEslinear_le, AUDIO_ENCODING_SLINEAR_LE },
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{ "linear_le", AUDIO_ENCODING_SLINEAR_LE },
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{ AudioEulinear_le, AUDIO_ENCODING_ULINEAR_LE },
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{ AudioEslinear_be, AUDIO_ENCODING_SLINEAR_BE },
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{ "linear_be", AUDIO_ENCODING_SLINEAR_BE },
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{ AudioEulinear_be, AUDIO_ENCODING_ULINEAR_BE },
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{ AudioEmpeg_l1_stream, AUDIO_ENCODING_MPEG_L1_STREAM },
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{ AudioEmpeg_l1_packets,AUDIO_ENCODING_MPEG_L1_PACKETS },
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{ AudioEmpeg_l1_system, AUDIO_ENCODING_MPEG_L1_SYSTEM },
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{ AudioEmpeg_l2_stream, AUDIO_ENCODING_MPEG_L2_STREAM },
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{ AudioEmpeg_l2_packets,AUDIO_ENCODING_MPEG_L2_PACKETS },
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{ AudioEmpeg_l2_system, AUDIO_ENCODING_MPEG_L2_SYSTEM },
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{ NULL, -1 }
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};
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char *
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audio_enc_from_val(val)
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int val;
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{
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int i;
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for (i = 0; encs[i].ename; i++)
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if (encs[i].eno == val)
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break;
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return (encs[i].ename);
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}
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int
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audio_enc_to_val(enc)
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const char *enc;
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{
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int i;
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for (i = 0; encs[i].ename; i++)
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if (strcmp(encs[i].ename, enc) == 0)
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break;
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if (encs[i].ename)
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return (encs[i].eno);
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else
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return (-1);
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}
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/*
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* SunOS/NeXT .au format helpers
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*/
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struct {
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int file_encoding;
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int encoding;
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int precision;
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} file2sw_encodings[] = {
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{ AUDIO_FILE_ENCODING_MULAW_8, AUDIO_ENCODING_ULAW, 8 },
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{ AUDIO_FILE_ENCODING_LINEAR_8, AUDIO_ENCODING_ULINEAR_BE, 8 },
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{ AUDIO_FILE_ENCODING_LINEAR_16, AUDIO_ENCODING_ULINEAR_BE, 16 },
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{ AUDIO_FILE_ENCODING_LINEAR_24, AUDIO_ENCODING_ULINEAR_BE, 24 },
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{ AUDIO_FILE_ENCODING_LINEAR_32, AUDIO_ENCODING_ULINEAR_BE, 32 },
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#if 0
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/*
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* we should make some of these available. the, eg ultrasparc, port
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* can use the VIS instructions (if available) do do some of these
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* mpeg ones.
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*/
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{ AUDIO_FILE_ENCODING_FLOAT, AUDIO_ENCODING_ULAW, 32 },
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{ AUDIO_FILE_ENCODING_DOUBLE, AUDIO_ENCODING_ULAW, 64 },
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{ AUDIO_FILE_ENCODING_ADPCM_G721, AUDIO_ENCODING_ULAW, 4 },
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{ AUDIO_FILE_ENCODING_ADPCM_G722, AUDIO_ENCODING_ULAW, 0 },
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{ AUDIO_FILE_ENCODING_ADPCM_G723_3, AUDIO_ENCODING_ULAW, 3 },
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{ AUDIO_FILE_ENCODING_ADPCM_G723_5, AUDIO_ENCODING_ULAW, 5 },
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#endif
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{ AUDIO_FILE_ENCODING_ALAW_8, AUDIO_ENCODING_ALAW, 8 },
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{ -1, -1 }
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};
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int
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audio_get_sun_encoding(sun_encoding, encp, precp)
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int sun_encoding;
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int *encp;
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int *precp;
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{
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int i;
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for (i = 0; file2sw_encodings[i].file_encoding != -1; i++)
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if (file2sw_encodings[i].file_encoding == sun_encoding) {
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*precp = file2sw_encodings[i].precision;
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*encp = file2sw_encodings[i].encoding;
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return (0);
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}
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return (1);
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}
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/*
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* sample header is:
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*
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* RIFF\^@^C^@WAVEfmt ^P^@^@^@^A^@^B^@D<AC>^@^@^P<B1>^B^@^D^@^P^@data^@^@^C^@^@^@^@^@^@^@^@^@^@
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*
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*/
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/*
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* WAV format helpers
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*/
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/*
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* find a .wav header, etc. returns header length on success
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*/
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size_t
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audio_parse_wav_hdr(hdr, sz, enc, prec, sample, channels)
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void *hdr;
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size_t sz;
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int *enc;
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int *prec;
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int *sample;
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int *channels;
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{
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char *where = hdr;
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wav_audioheaderpart *part;
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wav_audioheaderfmt *fmt;
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char *end = (((char *)hdr) + sz);
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int newenc, newprec;
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if (sz < 32)
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return (AUDIO_ENOENT);
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if (strncmp(where, "RIFF", 4))
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return (AUDIO_ENOENT);
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where += 8;
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if (strncmp(where, "WAVE", 4))
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return (AUDIO_ENOENT);
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where += 4;
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do {
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part = (wav_audioheaderpart *)where;
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where += getle32(part->len) + 8;
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} while (where < end && strncmp(part->name, "fmt ", 4));
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/* too short ? */
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if (where + 16 > end)
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return (AUDIO_ESHORTHDR);
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fmt = (wav_audioheaderfmt *)(part + 1);
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#if 0
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printf("fmt header is:\n\t%d\ttag\n\t%d\tchannels\n\t%d\tsample rate\n\t%d\tavg_bps\n\t%d\talignment\n\t%d\tbits per sample\n", getle16(fmt->tag), getle16(fmt->channels), getle32(fmt->sample_rate), getle32(fmt->avg_bps), getle16(fmt->alignment), getle16(fmt->bits_per_sample));
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#endif
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switch (getle16(fmt->tag)) {
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case WAVE_FORMAT_UNKNOWN:
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case WAVE_FORMAT_ADPCM:
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case WAVE_FORMAT_OKI_ADPCM:
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case WAVE_FORMAT_DIGISTD:
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case WAVE_FORMAT_DIGIFIX:
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case IBM_FORMAT_MULAW:
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case IBM_FORMAT_ALAW:
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case IBM_FORMAT_ADPCM:
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default:
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return (AUDIO_EWAVUNSUPP);
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case WAVE_FORMAT_PCM:
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switch (getle16(fmt->bits_per_sample)) {
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case 8:
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newprec = 8;
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break;
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case 16:
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newprec = 16;
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break;
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case 24:
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newprec = 24;
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break;
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case 32:
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newprec = 32;
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break;
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default:
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return (AUDIO_EWAVBADPCM);
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}
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if (newprec == 8)
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newenc = AUDIO_ENCODING_ULINEAR_LE;
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else
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newenc = AUDIO_ENCODING_SLINEAR_LE;
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break;
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case WAVE_FORMAT_ALAW:
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newenc = AUDIO_ENCODING_ALAW;
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newprec = 8;
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break;
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case WAVE_FORMAT_MULAW:
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newenc = AUDIO_ENCODING_ULAW;
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newprec = 8;
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break;
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}
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do {
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part = (wav_audioheaderpart *)where;
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#if 0
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printf("part `%c%c%c%c' len = %d\n", part->name[0], part->name[1], part->name[2], part->name[3], getle32(part->len));
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#endif
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where += (getle32(part->len) + 8);
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} while ((char *)where < end && strncmp(part->name, "data", 4));
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if ((where - getle32(part->len)) <= end) {
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*channels = getle16(fmt->channels);
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*sample = getle32(fmt->sample_rate);
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*enc = newenc;
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*prec = newprec;
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part++;
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return ((char *)part - (char *)hdr);
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}
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return (AUDIO_EWAVNODATA);
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}
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/*
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* these belong elsewhere??
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*/
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void
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decode_int(arg, intp)
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const char *arg;
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int *intp;
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{
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char *ep;
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int ret;
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ret = strtoul(arg, &ep, 0);
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if (ep[0] == '\0') {
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*intp = ret;
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return;
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}
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errx(1, "argument `%s' not a valid integer", arg);
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}
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void
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decode_time(arg, tvp)
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const char *arg;
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struct timeval *tvp;
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{
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char *s, *colon, *dot;
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char *copy = strdup(arg);
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int first;
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if (copy == NULL)
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err(1, "could not allocate a copy of %s", arg);
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tvp->tv_sec = tvp->tv_usec = 0;
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s = copy;
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/* handle [hh:]mm:ss.dd */
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if ((colon = strchr(s, ':'))) {
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*colon++ = '\0';
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decode_int(s, &first);
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tvp->tv_sec = first * 60; /* minutes */
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s = colon;
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if ((colon = strchr(s, ':'))) {
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*colon++ = '\0';
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decode_int(s, &first);
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tvp->tv_sec += first;
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tvp->tv_sec *= 60; /* minutes and hours */
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s = colon;
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}
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}
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if ((dot = strchr(s, '.'))) {
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int i, base = 100000;
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*dot++ = '\0';
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for (i = 0; i < 6; i++, base /= 10) {
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if (!dot[i])
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break;
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if (!isdigit(dot[i]))
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errx(1, "argument `%s' is not a value time specification", arg);
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tvp->tv_usec += base * (dot[i] - '0');
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}
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}
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decode_int(s, &first);
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tvp->tv_sec += first;
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#if 0
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printf("tvp->tv_sec = %ld, tvp->tv_usec = %ld\n", tvp->tv_sec, tvp->tv_usec);
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#endif
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free(copy);
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}
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/*
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* decode a string into an encoding value.
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*/
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void
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decode_encoding(arg, encp)
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const char *arg;
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int *encp;
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{
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size_t len;
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int i;
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len = strlen(arg);
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for (i = 0; encs[i].ename; i++)
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if (strncmp(encs[i].ename, arg, len) == 0) {
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*encp = encs[i].eno;
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return;
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}
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errx(1, "unknown encoding `%s'", arg);
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}
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const char *const audio_errlist[] = {
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"error zero", /* nothing? */
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"no audio entry", /* AUDIO_ENOENT */
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"short header", /* AUDIO_ESHORTHDR */
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"unsupported WAV format", /* AUDIO_EWAVUNSUPP */
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"bad (unsupported) WAV PCM format", /* AUDIO_EWAVBADPCM */
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"no WAV audio data", /* AUDIO_EWAVNODATA */
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};
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const char *
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audio_errstring(errval)
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int errval;
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{
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errval = -errval;
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if (errval < 1 || errval > AUDIO_MAXERRNO)
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return "Invalid error";
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return audio_errlist[errval];
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}
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