167 lines
6.1 KiB
C
167 lines
6.1 KiB
C
/* $NetBSD: auconv.h,v 1.14 2005/12/11 12:20:53 christos Exp $ */
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/*-
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* Copyright (c) 1997 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Lennart Augustsson.
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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. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the NetBSD
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* Foundation, Inc. and its contributors.
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* 4. Neither the name of The NetBSD Foundation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef _SYS_DEV_AUCONV_H_
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#define _SYS_DEV_AUCONV_H_
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#include <dev/audio_if.h>
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/* common routines for stream_filter_t */
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extern void stream_filter_set_fetcher(stream_filter_t *, stream_fetcher_t *);
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extern void stream_filter_set_inputbuffer(stream_filter_t *, audio_stream_t *);
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extern stream_filter_t *auconv_nocontext_filter_factory
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(int (*)(stream_fetcher_t *, audio_stream_t *, int));
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extern void auconv_nocontext_filter_dtor(struct stream_filter *);
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#define FILTER_LOOP_PROLOGUE(SRC, SRCFRAME, DST, DSTFRAME, MAXUSED) \
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do { \
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const uint8_t *s; \
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uint8_t *d; \
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s = (SRC)->outp; \
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d = (DST)->inp; \
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for (; audio_stream_get_used(DST) < MAXUSED \
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&& audio_stream_get_used(SRC) >= SRCFRAME; \
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s = audio_stream_add_outp(SRC, s, SRCFRAME), \
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d = audio_stream_add_inp(DST, d, DSTFRAME))
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#define FILTER_LOOP_EPILOGUE(SRC, DST) \
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(SRC)->outp = s; \
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(DST)->inp = d; \
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} while (/*CONSTCOND*/0)
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/* Convert between signed and unsigned. */
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extern stream_filter_factory_t change_sign8;
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extern stream_filter_factory_t change_sign16;
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/* Convert between little and big endian. */
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extern stream_filter_factory_t swap_bytes;
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extern stream_filter_factory_t swap_bytes_change_sign16;
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/* Byte expansion/contraction */
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extern stream_filter_factory_t linear8_to_linear16;
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extern stream_filter_factory_t linear16_to_linear8;
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/* sampling rate conversion (aurateconv.c) */
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extern stream_filter_factory_t aurateconv;
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struct audio_format {
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/**
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* Device-dependent audio drivers may use this field freely.
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*/
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void *driver_data;
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/**
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* combination of AUMODE_PLAY and AUMODE_RECORD
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*/
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int32_t mode;
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/**
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* Encoding type. AUDIO_ENCODING_*.
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* Don't use AUDIO_ENCODING_SLINEAR/ULINEAR/LINEAR/LINEAR8
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*/
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u_int encoding;
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/**
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* The size of valid bits in one sample.
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* It must be <= precision.
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*/
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u_int validbits;
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/**
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* The bit size of one sample.
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* It must be >= validbits, and is usualy a multiple of 8.
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*/
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u_int precision;
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/**
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* The number of channels. >= 1
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*/
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u_int channels;
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u_int channel_mask;
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#define AUFMT_UNKNOWN_POSITION 0U
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#define AUFMT_FRONT_LEFT 0x00001U /* USB audio compatible */
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#define AUFMT_FRONT_RIGHT 0x00002U /* USB audio compatible */
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#define AUFMT_FRONT_CENTER 0x00004U /* USB audio compatible */
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#define AUFMT_LOW_FREQUENCY 0x00008U /* USB audio compatible */
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#define AUFMT_BACK_LEFT 0x00010U /* USB audio compatible */
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#define AUFMT_BACK_RIGHT 0x00020U /* USB audio compatible */
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#define AUFMT_FRONT_LEFT_OF_CENTER 0x00040U /* USB audio compatible */
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#define AUFMT_FRONT_RIGHT_OF_CENTER 0x00080U /* USB audio compatible */
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#define AUFMT_BACK_CENTER 0x00100U /* USB audio compatible */
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#define AUFMT_SIDE_LEFT 0x00200U /* USB audio compatible */
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#define AUFMT_SIDE_RIGHT 0x00400U /* USB audio compatible */
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#define AUFMT_TOP_CENTER 0x00800U /* USB audio compatible */
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#define AUFMT_TOP_FRONT_LEFT 0x01000U
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#define AUFMT_TOP_FRONT_CENTER 0x02000U
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#define AUFMT_TOP_FRONT_RIGHT 0x04000U
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#define AUFMT_TOP_BACK_LEFT 0x08000U
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#define AUFMT_TOP_BACK_CENTER 0x10000U
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#define AUFMT_TOP_BACK_RIGHT 0x20000U
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#define AUFMT_MONAURAL AUFMT_FRONT_CENTER
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#define AUFMT_STEREO (AUFMT_FRONT_LEFT | AUFMT_FRONT_RIGHT)
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#define AUFMT_SURROUND4 (AUFMT_STEREO | AUFMT_BACK_LEFT \
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| AUFMT_BACK_RIGHT)
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#define AUFMT_DOLBY_5_1 (AUFMT_SURROUND4 | AUFMT_FRONT_CENTER \
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| AUFMT_LOW_FREQUENCY)
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/**
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* 0: frequency[0] is lower limit, and frequency[1] is higher limit.
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* 1-16: frequency[0] to frequency[frequency_type-1] are valid.
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*/
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u_int frequency_type;
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#define AUFMT_MAX_FREQUENCIES 16
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/**
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* sampling rates
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*/
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u_int frequency[AUFMT_MAX_FREQUENCIES];
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};
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#define AUFMT_INVALIDATE(fmt) (fmt)->mode |= 0x80000000
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#define AUFMT_VALIDATE(fmt) (fmt)->mode &= 0x7fffffff
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#define AUFMT_IS_VALID(fmt) (((fmt)->mode & 0x80000000) == 0)
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struct audio_encoding_set;
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extern int auconv_set_converter(const struct audio_format *, int,
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int, const audio_params_t *, int,
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stream_filter_list_t *);
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extern int auconv_create_encodings(const struct audio_format *, int,
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struct audio_encoding_set **);
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extern int auconv_delete_encodings(struct audio_encoding_set *);
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extern int auconv_query_encoding(const struct audio_encoding_set *,
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audio_encoding_t *);
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#endif /* !_SYS_DEV_AUCONV_H_ */
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